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GRAPHIC 

Radio 

Used 

j'Ic r ,n f0 nceUed 

fa C:icj O 

,uth:, ... 

by 

and 

Dayton, Ohio 

SURVEY of 

Radar 

the Army 

,J C_4 _ __j ____.___I_-_ 

BY A O 

rv h, w f 4 

BY AUTHORITY OF DIRECTOR, ATSC 

Ar 

Ai -IF nd 

Equipment 

Air Forces 

1 July 1945 

This document contains information affecting 

the national defense of the United States within the meaning of 

the Espionage Act (U.S.C. 50: 31, 32). The transmission of 

this document or the revelation of its contents in any manner 

to any unauthorized person is prohibited. 

DISTRIBUTION RECORD OF THIS DOCUMENT IS MAINTAINED 

BY: Air Technical Service Command, Wright Field, Dayton; 

Att: TSERR1B 

Colonel, Air Corps 

Colonel, Air Corps

SE~CTI N __ 'NAVIGT ION oQ;UI P TNT t 

GRAPHIC SUVEY Peresety 

Nomenclature Description Classification 

AN/A1PA 9 a o a a * 

* Precision Navigation Equipment 0 8 0 Unlssfe 

AN/AtP1- l O Q O * e * a O . Altimeter. 8 o O * " .. * * " * 

. Unclassified 

ANd/APN-2 0~ 

a 8 * * * * *,Airborne Interrogator Responser o " 8 a 8. Restricted 

AID/AN'.2T1 

AJ /APN5 3 * 

0 

0 a 

0 

" 

. 

* 

* * 

* 

0 

a 

Trainer Equipment. 80 

Airborne Precision Navigation 

" .. Restricted 

and bombing Equipment (Shoran)' * Unclassified 

AN/APN4 0 8 8 . a a a Navigation Equipment (Loran) 0 * Unclassified 

AN/APN-7 0 0 a 0 8 

A4N/APN_9 0 o 

PN,'APN-lO0 0** 

8 8 * 

. 

-** 

* 

." 

. 

a Airborne Transponder Beacon 0 . * 

O Simplified Loran Equipment 8 8 8 

Glider' Interrogator Responsor * * * 

* . -Unclassified 

a Unclassified 

Restricted 

"AN,

Foreword 

Clearance Number AAF-MD-E89 

j T sT and Radar Equipment used by the Army Air Forces 

is intended to furnish authorized personnel with graphic and narrative data relative 

PI 4 * to description, electrical and physical characteristics, purpose, and tactical employment 

of the radio and radar equipment used by the Army Air Forces. 

The Graphic Survey is not authorized as a basis for procurement storage, or issue, 

e, but is prepared only for information and guidance of research, development, procurement, 

storage, issue, and staff and planning activities. 

This publication is intended to cover all active equipment, both in use and in development. 

Publication is accomplished in a series of separate sections in order 

that reproduction and dissemination may be effected economically and expeditiously. 

Permanent binder covers are not furnished with the various sections of the Graphic 

Survey, but the pages of each section are printed on 8 1/2 x 11 inch paper and punched 

for the standard AAF three-hole binder, (binder, loose-leaf, 3 post, stock number 

8700-043800), commonly known within the AAF as "Technical Order Binder". 

With a few exceptions, data concerning each equipment is presented on two pages. 

"t +u * The first page contains a description and information relative to use, installation, 

and electrical characteristics; the second page, photographs of the various components 

and physical weights and dimensions. Within each section, the equipments 

are arranged alphabetically by official nomenclature and type designation. 

SaffetSiors . 

eSeci,: 

4tlLD4 du 

:~ 

Suggestions are invited for improvement of form, content, or to otherwise increase 

the ultimate utility to the user within the scope and purpose of this publication. Comments 

should be addressed to the Commanding General, Air Technical Service Command, 

Wright Field, onsideration. 

The Graphic Survey is classified "Secret" because the broad scope of the equipment 

covered in each volume and the secretclassification of many of the equipments 

Each addressee will be responsible for maintaining the security of his copies in 

accordance with the provisions of AR 380-5. Security classification of each individual 

equipment at the time of publication will be indicated on the pages relative to 

that equipment. 

Requests relative to distribution of this publication should be addressed to Commanding 

General, Air Technical Service Command, Attention: TSERR1B. Revisions 

and additions are forwarded periodically to original addressees in order that 

all copies may be kept up to date. Each copy has a serial number which is recorded 

on a master distribution file index. 

Preparation, publication and distribution of the Graphic Survey is accomplished in 

accordance with letter, Headquarters, AAF(AFDMA-2F), dated 5 April 1945, subject 

"Graphic Survey of Radio and Radar Equipment Used by the AAF". AAF report 

clearance number AAF-MD-E89 has been assigned. 

I7y7~GLB77B7~ ~II 

W-10200

INDEX July 1945 

Sect io#s 1,' /?ada-t IVe~4a1io#s ~ 

NOMENCLATURE DESCRIPTION 

AN/APA-9 

AN/APN-1 

AN/APN-2 

AN/APN-2T1 

AN/APN-3 

AN/APN-4 

AN/APN- 7 

AN/APN-9 

AN/APN-10 

AN/APN-12 

AN/APN-19 

AN/APN-T1i 

Precision Navigation Equipment 

Altimeter 

Airborne Interrogator Responser 

Trainer Equipment 

Airborne Precision Navigation 

and bombing Equipment (Shoran) 

Navigation Equipment (Loran) 

Airborne Transponder Beacon 

Simplified Loran Equipment 

Glider Interrogator Responsor 

Beacon Interrogator Responsor 

Airborne Beacon 

Trainer Equipment 

AN/CPA-1 Beacon Antenna Assembly 

AN/CPN-2 

AN/CPN-3 

AN/CPN-6 

AN/CPN- 7 

AN/CPN-8 

AN/CPN-11i - 

AN/CPN-12 - 

AN/CPN-16 

AN/CPT-2 

AN/TPN-1 

AN/TPN-3 

AN/UPN-1 

AN/UPN-2 

AN/UPN- 3 

AN/UPN-4 

MX-137/A) 

MX-138/A) 

Air Transportable Precision 

Navigation and Bombing Equipment 

Homing Beacon 

Homing Beacon (BGX) 

Blind Approach Beacon (BABS) 

Portable Beacon (BPS) 

Transportable "Loran" Ground 

Station - 

Air Transportable "Double 

Master Loran" Ground Station 

Sea Rescue Beacon 

Standard 

Standard 

Standard 

Standard 

Sub-Standard 

Sea Rescue Beacon ] Limited Procurement 

Portable Transponder Beacon . 

Portable Transponder Beacon 

Ultra Portable Beacon 



Ult .r&Potable Beacon ....... 

Re lector Target 

Standard 

Sub-Standard 

Standard 

Standard 

Limited Procurement 



Limited Standard 

Limited Standard 

See reverse side fr addenda and errata information. 

i" 

*TYPE **STATUS 

Standard 





t 

2 =...J_ 

W-10200

NOMENCLATURE 

SCR 718-C Altimeter 

DESCRIPTION *TYPE 

Homing Beacon 

MAINTENANCE AND TEST EQUIPMENT 

AN/UPM-1A 

TS-10/APN 

TS-16/APN 

TS-23/APN 

TS-111/CP 

TS-251/UP 

Radar Maintenance Equipment 

Test Set 

Test Set 

Test Set 

Test Set 

Test Set (Loran) 

Standard 

Standard 

* For definition of Type classification terms see AR 850-25 

**STATUS Defined: 

D - (Development): Initial pilot run has not been completed. 

P - (Production): Initial pilot run has been completed and quantity production is 

underway or has been completed. 

AN/APN-2 

AN/APN-2T1 

ERRATA 

Scope illustrationcaption: "Scope display shows range vertically on three scales, and azimuth horizontally 

right or left of beacon response centerline. Signal above shows range to beacon 33 miles and 300 left." 

AN/APN-3 

"Computor: this is a bombing computor (AAF type K 1) which automatically releases bombs and corrects 

for ballistics and wind." 

AN/APN-10 

Scope illustration should show -only statute mile scale with ranges of 0 to 5 and 0 to 50 miles. Illustration 

showing "Nautical Miles" and 0 to 10 scale is incorrect. 

AN/CPN-3 

First paragraph: "Radio Set AN/CPN-3, is an air transportable radar beacon for ground installation, 

designed to provide range,dlrection, and identification for homing of planes equipped with 10 cm band search 

radars." 

AN/CPN-16 

Standard 

Standard 

Standard 

Standard 

Standard 

**STATUS 

Illustration caption: "Sea Rescue Beacon Transmitter AN/CPN-16X for use in one man life rafts."

::fr r 

Radar Assembly AN/APA- 9, is an airborne navigational 

equipment designed to operate with the British 

Oboe Mark II navigation system. It is informally known 

as the "Aspen," and! is functionally similar to the AAF 

Shoran system. 

The "Aspen Kit", as Radar Assembly AN/APA- 

9 is called, essentially consists of an antenna; a modified 

AN/APS-2A modulating assembly with a RT Box; a 

mechanical bearing indicator, and certain minor components 

for operation of the set. 

"Aspen" is a navigation system whereby the 

airborne equipment (AN/APA-9) acts as a transponder unit 

upon being triggered by the two ground interrogator beacons 

commonly known as the "Cat" and "Mouse" stations. By 

measuring, with accurate ranging circuits, the time requi red 

for the radar signal to make the "round4-trip" (station-planestation), 

the ground station computer can plot the airplane's 

location with an accuracy of 50 feet of his actual position. 

Blind-bombing is accomplished by flying the aircraft 

along a given arc centered around the "Cat" station 

with the release point at a predetermined range from the 

"Mouse" station. The point of intersection of the pulse 

signal arcs from these two stations is the correct bomb 

release point. The bombardier is given aural warning and 

release signals by variation of pulse repetition rate from 

the "Mouse" station The pilot is given left-right aural 

signals by Variation of pulse repetition rate from the "CAT" 

station. One target can be attacked by this technique. 

Ground Oboe stations are supplied by the British, 

while the airborne equipment is supplied by both the British 

and the United States. 

Test equipment used for maintenance includes 

Test Set AN/CPM-l 

POWER INPUT 

POWER OUTPUT 

FREQUENCY 

RANGE 

ACCURACY 

BO~3 NLEASL POIT 6 ITBUOF 

TB E 

:' N A}NGRAT iM OFF 

.... !o .... TRI~tnR TmANS PON O 

Radar Assembly AN/APA-9 ("ASPEN") i the airborne element ofthe Q 

addition to facilitating precision blind bo nbing may be used as a navigatio 

or troop carrying aircraft to predetermied. areas. 

July 1945 

Installation AN/APA-9 in B-24 

600 WATTS, 26 VOL'S DC 

50 KW (PEAK) 

3243-3155 MC 

250 MILES AT 30,000 FT, 

BOMBING 100 YARDS 

RANGE 20 YARDS 

RAG 

AN/APA-9 

20AD 

7 

w~ 

~ ~% 

tion System which in 

ice to direct reconnaissance 

Section 4 - Graphic Survey

INAqF . 

Penwiper Receiver 

RADAR ASSEMBLY 

Component 

Control Box 

Antenna Assembly 

Jack Box 

Motor Generator 

Regulator Box 

Headset 

Transmitter Converter 

Control Box 

Mounting 

Cord 

Mounting 

Mounting 

Mounting 

Antenna Cover 

Filter 

Mounting 

Coupling 

Receiver 

Transformer 

Transmitter Converter 

AN/APA-9 

Nomenclature 

C-10/APA-9 

AS-66/APA-9 

J-47/APA-9 

PU-43/A 

CN-10/A 

H-14/A 

RT-38/APA- 9 

C-84/APA-9 

MT-157/APA-9 

CG-51/APA-9 

MT-176/APA-9 

FT-447 

MT-23/A 

CW-17/APA-9 

British Supplied 

FT-446 

M-297 

Filter Type 68 

Size 

Heighth 18" x Diam 4" 

5" x 4" x 3" 

24" x 24" x 24" 

8" x 11" x 20" 

24" x 24" x 24" 

and includes plugs, forrule, nuts, cords, connectors, cable clamps, Flexible conduit, 

adapters, cordage and misc. Cable. 

Section 4 - Graphic Survey 

I 

I- - 

14" wioe. 

Motor Generator 

Control Box 

Antenna 

TOTAL WEIGHT 250 LBS. 

Weight 

10 Lbs. 

1 Lb. 

30 Lbs. 

10 Lbs. 

100 Lbs. 

32 Lbs. 

10 Lbs. 

5 Lbs. 

1 Lb. 

5 Lbs. 

July 1945

Radio Set *AN/APN-1 is an airborne frequency 

modulated radar altimeter designed for installation in aircraft 

to provide direct indication of altitude above terrain 

during flight. 

This equipment is designed to emit, in a downward 

direction from the transmitter antenna, a radio freguency 

carrier which is frequency modulated at a rate of 

120 cycles per second between the approximate limits of 

420 and 460 mc on the low range (0-400 feet) and 443 to 

447 mc on the high range (400-4000 feet). The earth's surface 

reflects some of this radiated carrier, and the reflected 

signal is received on a separate receiver antenna. 

During the time interval required for the signal 

to travel to earth and return to the aircraft, the transmitter 

frequency will have changed. The combination of the received 

signal with a signal obtained directly from the transmitterwill 

result, byprocess of detection, in anaudio frequency 

signal the average frequency of which is proportional 

to the altitude of the aircraft above the ground. 

This equipment provides a dual range indicator 

of 0-400 feet and 400-4000 feet; having an accuracy within 

plus or minus 6 feet on the 400-foot range and within plus 

or minus 60 feet on the 4000-foot range. 

Radio Set *AN/APN- lA differs from*AN/APN-1 

only in that it is equipped with a single-range indicator and 

a two-position external range switch is used to provide dual 

range altitude readings. Both sets may be used in con- 

Altitude Limit Switch 

SA-1/ARN-1 

RADIO SET AN /APN-1 

Component 

Transmitter- Receiver 

Mounting Base 

Altitude Indicator 

Altitude Limit Switch 

Antenna 

Lamp 

POWER INPUT 73 WATTS 

FREQUENCY 420-460 MC 

442-446 MC 

TYPE OF SIGNAL FM 

RANGE 0-400 FT. *- 6 FT. 

400-4000 FT. + 60 FT. 

SWEEP RATE 120 CPS 

TUBE COMPLEMENT 

NO. TYPE NO. TYPE 

2 12H6 2 955 

3 12SJ7 2 9004 

4 12SH7 1 0D3/VR-150 

: .. Altitude Indicator 

ID-14/ARN-1 

Transmitter Receiver RT-7/APN-1 On Mounting Base MT-14/ARN-l 

Nomenclature 

*RT-7/APN-1 

*MT-14/ARN-1 

*ID-14/APN- 1 

*SA-1/ARN-1 

*AT-4/ARN-1 

LM-38 (3 EA) 

UNCLASSIFIEp 

Antenna AT-4/ARN- 

Antenna AT-4/ARN- 1 

TOTAL WEIGHT 4 5 LBS. 

Size 

x 19" x 9" 

x 19" x 8" 

x 4" x 6" 

x 4" DIAM 

x 12" x 2" 

*AN/APN-1 

junction with an automatic pilot. 

This equipment is designed for do operation and 

consumes approximately 2.5 amperes with 27.5 volts delivered 

to the battery input receptacle of the transmitterreceiver. 

Theinput current at 27volts is increased to approximately 

2.7 amperes when a limit indicator is used. 

The following test sets are required for the maintenance 

and tuning of *AN/APN-1: Test Set TS-10C/APN 

or Test Set TS-10B/APN; Test Set TS-16/APN; RCA 158 

Oscilloscope; and Multimeter TS-352/U. 

Requirements as of 1 February 1945 were 10,870 

for the calendar year 1945. 

Weight 

and includes plugs, cable marker tags, cable clamps, conductors, 

adapters, circuit breaker, indicators, misc. cable, and brackets. 

July 1945 \ LAS Section 4 - Graphic Survey 

Lbs. 

Lbs. 

Lbs. 

Lbs. 

Lbs.

UNCLASSIFIEP 

RadioSet*AN/APN-2 is an airborne radar interrogator-respondor 

of the "Rebecca" type that will enable 

an aircraft to home on ground radar beacons of the "Eureka" 

type such as AN/PPN-1 and AN/PPN-2 and the heavier 

beacons,AN/TPN-1 and AN/TPN-2. It is used in conjunction 

with suitable beacons for night landing of parachute 

troops, landing of gliders and maintaining airborne 

supply operation to isolated positions. 

In operation the Rebecca (*AN/APN-2) emits a 

pulse, "triggering" the Eureka (AN/PPN-1) and causing 

it to return a pulse. This returned pulse is received by 

the Rebecca in the aircraft and appears as a signal pip on 

the scope, thereby indicating range and direction of the beacon. 

A form of communication between Rebecca and 

Eureka is also provided. The Eureka operator, while listening 

for triggering through his earphones, can send the 

Rebecca operator a coded message by depressing a key 

provided for that purpose. Such messages are read in the 

Rebecca indicator as a blinking of the signal pip. This type 

of communication, though slow, can be used to notify Rebecca 

planes of any last minute changes caused, for example, 

by change of wind direction or surprise enemy action. 

Chief difference between Rebecca - Eureka and 

other beacon systems lies in the size and weight of the units. 

Rebecca is designed solely to interrogate an Eureka; it 

serves no otherfunction and requires no other radar in the 

aircraft. Hence Rebecca canbe installed in atroopearrier 

airplane at a cost in weight of only 85 pounds compared 

to an installedweight of 400-500 pounds for an ASV radar. 

(1) Indicator BC-929-A (2) Radio Control Box BC-1145-A 

Radio Receiver and Transmitter BC-800-A (not shown) 

July 1945 

*AN/APN- 2 

Scope records range vertically on three scales & azimuth 

horizontally right or left of centerline of beacon response 

signal above shows beacon 33 miles away & approx.30°right. 

As soon as anEureka has been set up (usually it 

can be done in less than 10 minutes) it is ready to be triggered 

and to signal in return to incoming Rebecca equipped 

troop carriers. 

Rebecca and Eureka must each use the proper 

frequency channel - i.e., Rebecca interrogates and Eureka 

is triggered on one frequency; Eureka responds and Rebecca 

receives the response on another frequency. This 

allows 20 different channels, enough to act as a safeguard 

against tapping by the enemy. 

Radio Set *AN/APN-2 is designed to direct an 

airplane to within 200 yards of the ground beacon and will 

provide a good homing signal at a distance of 50 miles from 

transportable Beacon Transmitter-Receiver AN/TPN-3, 

and 80 miles from transportable Beacon Transmitter-Receiver 

AN/TPN-2. 

Power requirements of the equipment are 185 

watts at 80 or 115 volts, 400-2400 c.p.s. and 25 watts at 

24 volts dc. 

Radio Set *AN/APN-2Y is identical to*AN/APN-2 

except for its voltage supply requirement of 12 volts dc. 

Test equipment used in the maintenance of Radio 

Set *AN/APN-2jncludes Squadron Test Equipment IE-56-A 

and Depot Test Equipment IE-45-A. 

Army requirements as of 1 February 1945 were 

5512 for the calendar year 1945. 

~13 

POWER INPUT 185 WATTS - 80/115V.AC 

25 WATTS @ 24V. DC 

POWER OUTPUT 500 WATTS (PEAK) 


TYPE OF SIGNAL PULSE 

RANGE 50 MI WITH AN/TPN-1 

25 MI WITH AN/PPN-1 

80 MI WITH AN/TPN-2 

SENSITIVITY 20 MICROVOLTS 



1 955 1 5U4G 

3 956 1 2C26 

6 6AC7 1 6V6GT/G 

1 6SL7GT 1 6X5GT/G 

3 6SN7GT 1 6G6G 

3 6H6GT/G 1 3BPI 

2 2X2 

4 v-~ ~' 

~ ~. ~ t ~ Section 4 - Graphic Survey

*AN/APN-2 

Radio Receiver and Transmitter 

*RT-1A/APN-2 

on Mounting FT-416-A 

Remote Control 

Device C-134/APN 

RADIO SET *AN/APN -2 

Component 


Radio Control Box 

Indicator 

Antenna 

Mounting 

Mounting 

Mounting 

Antenna 

Remote Tuning Device 

Tuning Adapter 

Tuning Shaft 

Tuning Shaft MC-215 

and includes plugs, adapters, fuses and RF cable. 


rsr eI p 

Indicator BC-929-A 

on Mounting FT-409-A 

Tuning Adapter 

MX-196/APN 

Antenna *AT-2/APN-2 

Nomenclature 

*RT-1/APN-2 

*C-3/APN-2 

BC-929-A 

*AT-2/APN (2 ea) 

FT-409-A 

FT-416-A 

FT-406-A 

*AT-1/APN-2 

C-134/APN 

MX-196/APN 

MC-215 

~R~1A~SI~BED 

Antenna 

*AT-1/APN-2 

Size 

13" x 12" x 9" 

3" x 4" x 8 °' 

9" x 9" x 16" 

8" 

9" x 16" 

13" x 9" 

4" x 8" 

8" 

4" x 3" x 3" 

3" x 3" x 2" 

Visor 

Control Box 

*C-3/APN-2 

Mounting 

FT-406-A 


Weight 

34 Lbs. 

2 Lbs. 

26 Lbs. 

5 Lbs. 

3 Lbs. 

3 Lbs. 

1 Lb. 

2 Lbs. 

1 Lb. 

1 Lb. 

1 Lb. 

July 1945

Training Equipment AN/APN - 2T1 is a bench 

trainer designed to train students in the operation of Radio 

Set *AN/APN-2. It is intended to present the conditions 

which may arise during actual flight. Provision is made for 

the selection of similated video range , azimuth, beacon 

-als etc., chosen by the instructor, training the student 

to make the necessary adjustments or observations on the 

*AN/APN-2 normally required during actual flight. 

Signals furnished by the various beacons used 

with the *AN/APN-2 can be similated by the trainer. The 

equipment contains all the components of the *AN/APN-2 

withthe additionof a Radio Frequency Oscillator O-7/APN- 

2T1. 

AN/APN-2T1 requires no special test equipment. 

There were no Army Air Force Requirements as 

of 1 February 1945. 

POWER INPUT ,160 WATTS @ 80 VOLTS 

A.C. 




1 955 1 5Y3GT/G 

2 6SN7GT 

AN/APN-2 Ti 

Scope records range vertically on three scales & azimuth 

horizontally right or left of centerline of Beacon Response 

.signal;above shows simulated beacon 33 miles away and 

approx. 300 right. 

Visor Indicator BC-929-A Training Unit Indicator BC-929-A Visor 

Inverter Unit PE-115-A Radio Receiver and Transmitter Control Panel BC-793-A Radio Control Box 

TRAINING EQUIPMENT AN/APN-2T1 TOTAL WEIGHT 2 00 LBS. 

Component 


Mounting 

Indicator 

Mounting 


Mounting 

Radio Frequency Oscillator 

Inverter Unit 

Control Panel 

and includes plugs and misc. cables. 

July 1945 

Nomenclature 

RT-1/APN-2 

FT-416-A 

BC-929-A(2 each) 

FT-409-A(2 each) 

C-3/APN-2 

FT-406-A 

O-7/APN-2-Tl 

PE-115-A 

BC-703-A 

Size 

13" x 12" x 9" 

12" x 10" x 3" 

9" x 9" x 16" 

15" x 9" x 2" 

3" x 4"x 8" 

7" x 4" x 2" 

11" x 22" x 15" 

12" x 8" x 12" 

9" x 10" x 12" 

Weight 

35 Lbs. 

3 Lbs. 

26 Lbs. 

3 Lbs. 

2 Lbs. 

1 Lb. 

65 Lbs. 

33 Lbs. 

20 Lbs. 


AN/ APN- 3 

Radio Set AN/APN-3 is tlt t re .PN-3 p o" 0ut 

matically releases the bombs and corthe 

precisionaircraft navigational sy °enlnown as Shar. eyrecd fo ja ii or wind. 

Used for precision navigation, per rtang poitioirtg-f " {j Ae thiscomponent isused to transmit and 

sircraftwithin 75 feet of any point in e range of the sy- 'decev ti als. It consists of two vertical coaxial 

ternm. 

units and is omnidirectional. 

Shoran consists of a single aircraft equipment 

Test equipment required includes Wavemeter 

(AN/APN-3) and two identical ground station equipments TS-247/APM-48, Voltemeters IS-185 and IS-189, Power 

(AN/CPN-2). The AN/APN-3 measures the distance from Meter TS-305/UP, Cord CX-187/APN-3. 

the aircraft to each of the two ground stations (AN/CPN-2). POWERINPUT 700 WATTS, 115 VOLTS, 

A maximum of 20 AN/APN-3's can use a single pair of 

ground beacons simultaneously. 

Used as a bombing system, the course of each 

aircraftis determined with the aid of accurate maps. The 

AN/APT-3 is adjusted so that when the aircraft reaches 

the point of bomb release the pips indicating the distance 

to each of the ground stations will coincide with the reference 

mark on the indicator. Approach to the target may 

be made from any direction in a given arc. (For further 

details on the operation of Shoran see Radio Set AN/CPN-2). 

The following major components of AN/APN-3 

perform the operations indicated: 

Transmitter; this unit operates alternately on 

POWER INPUT 700 WATT S, 115 VOLTS. 495 

400 TO 2400 OPS. 495 

P RWATTS, 7.5 VOLTS D.C. 

POWER OUTPUT 12 KW (PEAK) 

FREQUENCY (TRANSMIT.) 220 TO 270 MCS 

FREQUENCY RECEIV. 220 TO 330 MCS 

SWITCHING RATE 10 CPS 

PULSE LENGTH 0,5 MICROSECOND 

RECEIVER SENSITIVITY 10 MICROVOLTS 

RANGE 280 MIS AT 0000 

ACCURACY - D ICATED DISTAN CE: 

12.±75'; BOMBING: 

125 MILS 

two different frequencies (about 20 mcx apart) which permits 

discrimination between the two receiving ground stations. 

Receiver-Indicator; this unit receives the response 

from the two ground beacons (AN/CPN-2) by means 

of a scrambling device relays them to the indicator in their 

proper relation. The 3-inch "J-type" scope.(circular scan) 

indicates the time delay in miles distance between the arrival 

of the two signals. 

Comparator; this unit indicates the departure 

or error of the aircraft in respect to the predetermined 

course. 

Computor; this is a bombing computor (AAF 

NO. 

3 

3 

2 

11 

4 

1 

1 

2 

7 


TYPE NO. 

3E29 2 

5R4GY 1 

5Y3GT/G 1 

6A7 5 

6AG7 8 

6H6 19 

RKR73 4 

4C28 3 

6AG5 1 

TYPE 

6J6 

2X2 

3DPl 

6SA7 

6SL7GT 

6SN7GT 

6V6GT/G 

OD3/VR-150 

OC3/VR-105 

Radio set AN/APN-3 is the airborne element of an Airc aft Navigation System employing radar ranging and 

principles known as SHORAN. It may be used for precision bombin, dropping paratroops and sunnli es, aerial 

mapping, or precision navigation of arcraft and surface vessels. 

Sec.tion 4 - Graphic Su rey 

July 1945 

1~~---- r e

AN/APN-3 

Radio Transmitter T-11/APN-3 

On 

Mounting MT-215/APN-3 

Comparator CM-3/APN-3 

On 

Mounting Base MT-167/U 

~ 

49~ 

~P\ 

K 

Antenna 

AT-13/APN-3 

A i 

Antenna 

AT-14/APN- 3 

Indicator ID-17/APN- 3 

On 

Mounting MT-216/APN-3 

Pilot Direction 

Indicator ID-103/APN- 3 

RADIO SET AN /APN- 3 TOTAL WEIGHT 335 LBS. 

Component 

Computer 

Radio Receiver 

Indicator 

Antenna 

Radio Transmitter 

Visor 

Antenna 

Mounting 

Mounting 

Cord 

Inverter 

Pilot Direction indicator 

Mounting 

Comparator 

Mounting 

Nomenclature 

K1 

R-15/APN-3 

ID-17/APN-3 

AT-14/APN-3 

T- 11/APN-3 

M-387 

AT-13/APN- 3 

MT-215/APN- 3 

MT-216/APN-3 

CX-198/APN-3 

PU-16/AP 

ID-103/APN-3 

MT-182/AP 

CM-3/APN-3 

MT-167/APN-3 

and includes plugs, adapters, connectors, switch and miscellaneous cable. 


I Mi 

Size 

9" x 17" x 20" 

(included as indicator) 

15" x 18" x 25" 

3" x 3" x 12" 

20" x 23" x 21" 

4" x 4" x 4" 

3" x 3" x 14" 

2" x 20" x 21" 

12" x 18" x 21" 

Length 5' 

4" x 4" x 4" 

5" x 8" x 23" 

2" x 22' x 8" 

Weight 

56 Lbs. 

77 Lbs. 

1 Lb. 

106 Lbs. 

1 Lb. 

9 Lbs. 

16 Lbs. 

1 Lbs 

19 Lbs. 

3 Lbs. 

July 1945

UM LA SIHLP 

Radio Set *AN/APN-4,the airborne receiver element 

of the Loran navigation system (long range navigation), 

is utilized in conjunction with Loran ground stations 

to determine the geographical position of an aircraft in flight. 

This system, comprising a set of three or more fixed transmitters 

operated in conjunction with appropriate special receiver 

equipment, provides, by the utilization of radar rangingprinciples, 

long range navigation information, used for 

the guidance of aircraft. 

Comparable in accuracy to celestial navigation, 

Loranhas the advantage that it can be used under unfavorable 

weather conditions. Maximum range of Loran operation 

is approximately 600 miles over water and 300 miles 

over land when working with direct radio waves (ground 

waves) from the associated ground stations, andapproximately, 

1,200 miles when sky waves (reflected waves) are 

used. 

Synchronized ground stations operating in pairs 

generate radio frequency energy in the form of short wave 

trains having predetermined recurrence rates. The control 

station is designated the "Master" and the other, the 

"Slave." The difference in time of arrival of the two pulses 

at the airborne receiver is accurately measured by displaying 

the received pulses on timing markers on the screen 

of the cathode-ray tube of the airborne indicator. This information 

gives location of the airplane on a line of constant 

time difference which is plotted on a map of the region. To 

establish a navigational "fix," line of position must be obtainedfromanotherpair 

of stations, and the point of intersection 

of these lines is the position of the aircraft. Loran 

READING OF 

FIRST PAIR 

OFSTONS 

READING OF 

SECOND PA /R 

OFSAONS 

STEP I: ALIGNMENT 

OF SIGNALS ONTO 

PLATFORMS 

THE ADJUSTMENT OF THESE FUNCTIONS 

ARE COMMON TO BOTH READINGS 

STEP2: LOWER STEP3: FINER STEP 4: FINAL ALIGN- 

PIP ALIGNED WITH ALIGNMENT OF MENT OF P/PS BY 

UPPER PIP P/PS OVERLAPPING SIGNALS 

*AN/APN-4 

maps have been prepared for those areas now covered by 

the Loran net. 

Radio Set *AN/APN-4 fulfills the need for a radio 

navigational device to be used over areas far removed from 

radio range transmitters. It is not intended to replace the 

radio compass, but to extend the use of radio navigation 

beyond the range of low frequency transmitters. It is particularly 

useful on long ranges over water when overcast 

makes celestial navigation impossible. 

Test Equipment used in the maintenance of- this 

equipment includes TS-20/APN-4. 

POWER INPUT 260 WATTS, 80 or 115 V. 

FREQUENCY 1.7 TO 2.0 MC (4BANDS 


RANGE 600 MILES (GROUND WAVES) 

1200 MILES (SKY WAVES). 



4 6SK7GT 1 5U4G 

1 OC3/VR-105 2 2X2 

16 6SN7GT 1 6SA7GT 

4 6SL7GT 1 5CP1 

2 6SJ7GT 8 6H6GT/G 

3 6B4G 

STEP 5: READING FOR STEP6: READING FOR STEP 7: READING FOR 

TENS, EACH UNIT HAS HUNDREDS, EACH UNIT THOUSANDS, EACH UNIT 

VALUE OF TEN HAS VALUE OF FIFTY HAS VALUE OF FIVE HUNDRED 

Radio Set *AN/APN-4 is the airborne receiver element of the Loran Navigation System with which a radar 

fix is obtained by taking a reading on each of two Loran chains the order shown. 

Jtly 1945 ~Section 4 - Graphic Survey

JXIN/H1-V' 4 

Indicator *ID-6B/APN-4. 

RADIO SET 

Component 


Mounting 

Indicator 

Mounting 

Cord CD-946 

Power Cord 

AN /APN-4 

Nomenclature 

R-9/APN-4 

FT-447-A 

ID-6/APN-4 

FT-446 

t .LA IFIP 

'L.A ± ~ ± ~ 

and includes plugs, cordage, couplings, cable clamps, wire and RF cable. 


Radio Receiver *R-9A/APN-4 

Size 

20" x 9" x 8" 

20" x 9" x 12" 

Cord CD-540 

Cords CD-946 


Weight 

26 Lbs. 

3 Lbs. 

36 Lbs. 

3 Lbs. 

July 1945

Radar Beacon AN/APN-7 is an airborne transponder 

beacon employed to establish the identity of the aircraft 

in which it is installed. The equipment is designed 

particularly for operation with ASQ.i'SCR-517 and SCR- 717 

and provides navigational aid to other aircraft, acting as a- 

"rooster" on which they may home. It facilitates the location 

of a predetermined meeting place with other aircraft. 

The receiver has a 12mc. bandwidth and can be 

tuned over the 3220 mc. to 3320 mc. range. The transmitter 

uses a 446B lighthouse tube, with a power output of 

200 watts. The transmitter may be tuned over the 3220 

mc. to 3320 mc. range. 

Test equipment required for maintenance includes 

Test Set TS-14/AP, Frequency Meter TS-46/AP, 

Dumont 241 Oscilloscope and RCA type MI-18709 Signal 

Generator. 

AAF requirements as of 22 February 1945 were 

225 for the calendar year 1945. 



1 721-A 1 OC3/VR-105 

1 707-B 1 OD3/VR-150 

1 446-B 1 6E5 

3 6SN7GT 1 6B4G 

1 RK-34 1 2X2 

11 6AG5 1 5U4G 

1 13T4 1 6X5GT/G 

SAN/APN-7 

Receiver-Transmitter RT-21/APN-7 installed for operation. 

POWER INPUT 200 WATTS, 105-130 V, 

400 TO 2400 CPS; 10 WATTS, 

12/24 V, DC 




RANGE 50 MILES 

Radar Beacon AN/APN-7 is an airborne t eo bacnt alish the identity of the aircraft in 

which it is installed and provide navigation ad o other aircraft. 

July 1945 Section 4 - Graphic Survey

AN/APN-7 

Receiver-Transmitter RT-21/APN-7 

on Mounting Base MT-111/APN-7 

RADAR BEACON 

Component 

Receiver-Transmitter 



*Coder 

*Mounting Base 

AN/ APN-7 


AS-31/APN-7 

Coder KY-3/APN-7 

on Mounting Rack MT-148/APN-7 


Nomenclature 

RT-21/APN-7 

AS-31/APN-7 

MT-11/APN-7 

KY-3/APN-7 

MT-148/APN-7 

and includes antenna cable assembly, plugs and cable adapter. 

* optional items 

Size 

13" x 13" x 10" 

25" x 4" x 4" 

2" x 12" x 10" 

7" x 5" x 16" 

2" x 6" x 17" 

Weight 

36 Lbs. 

3 Lbs. 

3 Lbs. 

9 Lbs. 

2 Lbs. 

Section 4 - Graphic Survey July 1945

Radar Set AN/APN-9 is an airborne long range 

navigational equipment operated in conjunction with Loran 

ground stations to provide navigation aid for heavy and 

medium bombardment and transport type aircraft. 

This set, known as "Simplified Loran", is a 

single unit receiver-indicator weighing about 40 pounds, 

excludingpower source. Radar Set AN/APN-9 will replace 

Radio Set AN/APN-4, which is heavier and consists of several 

units. 

Comparable in accuracy to celestial navigation, 

Loran has the advantage that it can be used under unfavorable 

weather conditions. Maximum range of Loran operation 

is approximately 600 miles over water and 300 miles 

ever land; when working with direct radio waves (ground 

waves) from the associated ground stations, and approximately 

1,200 miles when sky waves or reflected waves from 

three ground stations are used. 

Ground stations operating in synchronism generate 

radio frequency energy in the form of short wave trains 

having predetermined recurrence rates. These stations 

operate in pairs, one designated the "master" station, 

and the other, a "slave" station. The difference in time 

of arrival of the two pulses at the airborne receiver is accurately 

measured by displaying the received pulses superimposed 

on timing markers on the screen of the cathoderay 

tubes of the airborne indicator. This information locates 

the airplane on a line of constant time difference which 

is plotted on a Loran chart of the region. To establish a 

AN/APN-9 

navigation fix, a line of position must be obtained from 

another pair of stations. The point of intersection of the 

two lines of constant time difference locates the position 

of the aircraft on the Loran Chart. 

Test equipment required in the maintenance of 

Radio Set AN/APN-9 includes Test Set TS-251/UP, RCA 

Oscilloscope Type 158, Signal Generator 1-72 and Weston 

Output Meter model 571 Type 3A. 



1 3BP1 3 6SL7GT/G 

1 2X2 13 6SN7GT/G 

1 5Y3GT/G 7 6H6GT/G 

1 6Y6G 3 6SK7GT/G 

2 6SJ7GT/G 1 6SA7GT/G 

1 OC3/VR-105 1 6N7 

Radio Set AN/APN-9 is the airborne receiver element of the Loran Navigational System with which a radar fix 

is obtained by taking a reading on each of two Loran chains in the order shown. 


AN/APN-9 

Visor 

Receiver Indicator R-65(XA) /APN-9(XA-2) 

RADAR SET AN /APN -9 TOTAL WEIGHT 41 LBS. 

Component 

Receiver-Indicator 

Mounting 

Coupling 

Cable Clamp 

Radio Frequency Cable 

Coupler 

Adapter 

Plugs 

Uses either fixed or trailing wire antenna. 

*~ Weight less than one pound. 

Section 4 - Graphic SurveyJuy94 

Nomenclature 

R-65/APN-9 

MT-203/APN 

MC- 277 

M-297 

RG- 8/U 

CUJ-92/APN 

M-359 

PL- 259-P 

Size 

11" x 9" x 19" 

40' 

3" x 2" x 2" 

{ 

Weight 

35 Lbs. 

3 Lbs. 

1Lb. 

July 1945

Radar Set AN/APN-10, a light weight, interrogator-responsor 

type, airborne navigational equipment, is 

designed to direct an airplane to within 200 yards of a ground 

or airborne beacon. The set will provide a good homing 

signal at a distance of fifty miles from transportable Beacon 

Transmitter-Receiver AN/TPN-2 or Radio Set SCR- 

695, and at twenty-five miles from portable Beacon Transmitter-Receiver 

AN/PPN-1 or AN/PPN-2. 

In conjunction with suitable companion beacons, 

this equipment may be used for landing parachute troops 

or gliders by night; maintaining airborne supply operations 

to isolated positions at night; demarcation of bombing line 

for close support bombers; identification of certain advanced 

units: homing on airfield beacons; homing on airborne beacons; 

identification of other friendly airplanes, and as a 

ground interrogator-responsor for identifying friendly airplanes 

and checking IFF equipment in aircraft during take - 

off or landing. 

This equipment is essentially a radio transmitter-receiver 

with a cathode ray indicator. A pulse modulated 

signal is transmitted by Radar Set AN/APN-10, received 

by the ground or airborne beacon which then automatically 

transmits a reply on the same or a different frequency, 

which when received is displayed on the cathode - 

ray indicator. 

The airplane is directed toward the beacon by 

turning until signals of equal amplitude are observed on 

each side of the indicator. 

This receiver-transmitter is housed in a single 

unit and will transmit and receive on any frequency between 

160 and 240 mc. Desired frequencies are selected by means 

of a tuning knob on the front panel of the unit. 

Radar Set AN/APN-10 may be installed in bombers, 

transports, gliders, and fighter airplanes, having a 

radio operator's or navigator's compartment. One individual 

is required to operate this equipment. 

Radar Set AN/APN-43 is similar to AN/APN-10, 

and may be used in connection with any Eureka type bea - 

con such as AN/TPN-2, AN/PPN-1, or AN/PPN-2. It also 

operates in conjunction with YH and YJ type beacons and 

SCR-695 IFF equipment. 

Test equipment required for maintenance and tuning 

of AN/APN-10 includes Test Equipment IE-45 (depot) 

and Test Equipment IE-56 (field). 

There were no AAF requirements as of 1 February 

1945. 

RADAR SET AN /APN-10 

Component 

Transmitter- Receiver- Indicator 

July 1945 

amn- 

AN/APN-10 

AN/APN-10 scope displays ground station responses on 

two scales with 0 to 5 and 0 to 50 mile ranges, and indicates 

right-left direction of the ground station relative to the line 

of flight. 

POWER INPUT 100 WATTS @ 22-30 VOLTS 

DC. 




RANGE 25-50 MILES 



1 6F4 1 3BP1 

6 6AK5 1 VR-150/30 

4 6J6 2 955 

3 6C4 1 6V6 

1 6AG5 1 8016 


NnmenCture + Si Weight 

RT-XA-16/APN-10(XA-2) 11" x 8" x 19" 30 Lbs. 


Radar Set AN/APN-12 is an airborne interrogator 

responsor equipment designed to indicate range and 

relative azimuth in conjunction with ground installations 

of radar beacons of the Eureka type, BABS equipment, and 

YR and YJ radar beacons. A modified "A" scope is used 

to give right left indications and range. This set is similar 

to Radio Sets SCR-729 and AN/APN-2 and is intended 

to supplement and eventually replace these sets since it 

combines their functions and frequency coverage. Shape 

and mounting of the AN/APN-12 is comparable to that of 

the SCR-729 and AN/APN-2. 

This equipment consists of a Receiver-Transmitter 

RT-11/APN-12 which can transmit and receive on 

at least three separate frequencies in the Mark III IFF 

band and on the five Rebecca-Eureka frequencies. Frequency 

of the transmitter and receiver are independently 

adjustable. Selector switchtuning permits use of any preset 

transmitter or receiver frequency while the aircraft 

is in flight. Normally the unit will operate as an interrogator 

responsor; however, the basic circuits have been so 

designed that the equipment may also operate as a transpondor 

beacon. The choice of either one depends on the 

tactical requirements. 

Test Equipment required for the operation and 

maintenance of AN/APN-12 includes Test Equipment IE- 

56-A, Signal Generator GR-804-C and Oscilloscope RCA- 

158. 

AN/APN-12 

POWER INPUT 30 WATTS D.C. @ 24-28 

VOLTS - 150 WATTS @ 80 

OR 115 VOLTS, 400 to 2400 

C.P.S. 

POWER OUTPUT 400-500 WATTS 

FREQUENCY 200-240 MC and 

156-186 MC 


RANGE 20 MI. FOR EUREKA 

BEACON, 90 MI. FOR YH 

OR YJ BEACON, 50 MI. FOR 

AN/TPN-1, AN/TPN-3, 

SCR-695, 100 MI. FOR 

AN/TPN-2 



6 6SN7GT 1 6J6 

4 6H6GT/G 7 6AC7 

2 2X2 1 6V6GT/G 

2 6X5GT/G 2 6SL7GT 

1 6G6GT 1 5U4G 

1 3BP1 1 2C26A 

1 6AK5 1 6E5 

1 9002 1 6SJ7 

Radar Set AN/APN-12 is an airborne interrot rresponpr equip.ment used in co$unction with ground beacons 

for aircraft navigation and for Mark I IFF 1 n, sea and air operations. 

JuLy 1945 Section 4 - Graphic Survey 

a SA

AN/APN- 12 

Control Boxes 

Receiver Transmitter 

RT-11/APN-12 

Antenna AT-96/APN-12 

Antenna AT-96/APN- 12 

Video Gate MX-284/APN-12 


RADAR SET AN/APN - 12 TOTAL WEIGHT 105 LBS. 

Component 


Control Box 

Control Box 

Indicator 

Mounting 

Mounting 

Mounting 

Antenna 

Antenna 

Video Gate 


Cable Clamp 

Coupling 

Remote Tuning Device 

Receptacle 

Nomenclature 

RT-11/APN-12 

C-169/APN-12 

C-170/APN-12 

ID-169/APN-12 

FT-406-A (2 each) 

FT-409-A 

FT-416-A 

AT-96/APN-12 (3 each) 

AT-97/APN-12 (2 each) 

MX-284/APN-12 

MT-165AU 

M-297 

MC-277 

C-195/APN-12 

UG-191/AP 

and includes plugs, adapters, cable adapters and r-f cables. 

* less than one pound in weight. 


Size 

12" x 12" x 13" 

4" x 6" x 3" 

4" x 10" x 3" 

5" x 6" x 10" 

6" x 2" x 10" 

3" x 3" x 3" 

1" long x 1" diam. 

Weight 

40 Lbs. 

1 Lb. 

1 Lb. 

26 Lbs. 

3 Lbs. 

3 Lbs. 

5 Lbs. 

5 Lbs. 

9 Lbs. 

2 Lbs. 

* 

1 Lb. 

* 

July 1945

!!] 

CI-g_ _II 

Radar Beacon AN/APN-19, (Rosebud) is an airborne 

range coded beacon which is installed in fighters to 

enable Ground Radars AN/CPS-1, AN/CPS-6 and SCR-584 

to identify and vector these airplanes at ranges greater 

than the ground radars normally can function with airplanes 

not so equipped. This equipment increases the range and 

reliability for close support bombing and photo- reconnaissance 

when used with modified SCR-584 radars. 

The set is capable of being interrogated by radars 

having beacon functions and replying with a range coded 

signal permitting the beacon to be located in range and azimath. 

A tunable 7 megacycle-bandwidth cavity is available 

when it is desired to eliminate all frequencies except those 

of one interrogating radar. Reply may be coded by three 

code pips, the spacing of which may be varied so that seven 

combinations are possible. 

The equipment is similar to Radio Set AN/UPM- 2 

adapted for airborne operation. Antenna Assembly AS-172/ 

AP, the horizontally polarized antenna designed for airborne 

operation, consists ofa dual linear array of six dipoles for 

receiving and transmitting. Present indications show that 

for fighter planes, vertically polarized antennas are pre- 

AN/APN-19 

ferred as the vertically polarized dipoles will be only one 

and one-half inches long. 

Test equipment required for maintenance and tuning 

includes Test Set TS-125/AP, Wavemeter TS-117/GP, 

Test Set TS-3A/AP, Signal Generator TS-155C/UP, Pressurizing 

Kit MK-20/UP, Multimeter TS-297/U, Oscilloscope 

TS-239/UP, Oscilloscope TS-34/AP, Voltage Divider TS- 

890()/AP, Multimeter TS-352/U, Dynamotor Test Set TS- 

414/U, and Tube Tester 1-177. 

Army Air Forces requirements as of 1 February 

1945 were 3273 for the calendar year 1945. 

POWER INPUT 

POWER OUTPUT 

TYPE OF STGNAL 

R T[TTV 

120 WATTS @ 28 VOLTS D-C 

50 WATTS (PEAK) 

2700-3400 MC 

RANGE CODED PULSES 

2 Tn 5 y 10-8 WATTS 



3 2D21 1 2C40 

2 7F8 5 7F8 

Radar Beacon AN/APN-19 installed in fit o the .hi eAmits close control operations at much 

greater ranges than are possible with no fraldetection radar in that the aircraft contact is maintained with the 

control station by beacon pulse rather thanwith the weaker reflected pulse. 

JuLy 1945 Section 4 - Graphic Survey

AN/APN-19 6-I. 

Radar Transmitter T-128/APN-19 

Dynamotor DY-30/APN-19 

Control Box C-238/APN-19 

RADAR BEACON AN/APN-19 

Component 

Control Box 

Control Box 

Antenna 

Radar Transmitter 

Radar Receiver 

Dynamotor 

and includes plugs cable adapters etc. 


Nomenclature 

C-238/APN-19 

C-239/APN-19 

AT- 104/APN- 19 

T- 128/APN-19 

R-149/APN-19 

DY- 30/APN- 19 

Size 

4', x 3" x 7" 

4', x 4" x 5" 

2" x 3" Diameter 

x 7" Diameter 

9" 

x 7" Diameter 

9" 

x 8" x 7" 

Radar Receiver R-149/APN-19 


Control Box C-239/APN-19 


Weight 

1 Lb. 

7*bs 

6 Lbs. 

10 Lbs. 

July 1945

Training Equipment AN/APN-T1 is a bench trainer 

designed to train students in the operation of Radio Set 

SCR-729. It is intended to present realistically to the student 

as many as possible of the situations which may arise 

under actual flight conditions in connection with the per - 

formance of SCR-729. 

Training Equipment AN/APN-Tl comprises various 

components of SCR-729, slightly modified. The training 

unit consists of two chassis, mounted one above the 

other, and assembled in a double-deck cabinet. The upper 

chassis contains Code Selector KY-2/APN-T1, while the 

lower contains RF Generator O-6/APN-T1. Either chassis 

may be removed through the front of the cabinet by dis - 

connecting the interconnecting cable and removing the proper 

rack panel screws. 

Synchronizing pulses from Radio Receiver and 

Transmitter BC-800-A are applied to the input circuit of 

the generator and enter two parallel channels. One channel 

generates a signal which simulates ground reflections 

The other channel generates signals which simulate responses 

fromvarious beacons and IFF equipment. The code 

selector works in conjunction witit the generator, providing 

mechanical switching to simulate coding; and also provides 

ameansofswitchingforthe selection of the desired signals. 

Each of the two generator channels contains an RF oscillator 

which is modulated by the video signals generated in 

that channel. The resulting RF pulses from both oscillators 

are coupled into a common RF output cable and applied 

to the receiver antenna input of Radio Receiver and 

Transmitter BC-800-A. These RF pulses are detected and 

AN/APN-T1 

the video pulses applied in the normal manner to Indicator 

BC-929-A. Thus, so far as the student is concerned, the 

indications on the indicator are similar to those occuring 

underflight conditions. The selection of the video signal, 

range, azimuth, etc., are at the discretion of the instructor. 

The instructor can, by suitable manipulation of the controls 

of the unit, require the student to make any adjustments or 

observations on SCR-729 which would normally be required 

of the student under flight conditions. 

Two indicators may be connected in parallel in 

order to provide separate indications for instructor and 

student. The BC-800-A and BC-929-A are wired so that 

they can be operatedfromthe 80-volt supply. This permits 

all units of the equipment to be operated from a common 

power supply. 

No special test equipment is necessary for maintenance 

of this trainer. 


1945. 

POWER INPUT 28 AMPS 24 V. DC 




1 6AC7 2 6SN7GT 

1 6J5 1 5Y3GT/G 

2 955 

Indicator BC-929-A Visor Radio Frequency Generator O-6/APN-Tl Visor Indicator BC-929-A 

Component 

Control Panel BC-703-A 

Inverter Unit PE.-115-A Radio Receiver and Transmitter Control Box 

BC-1145-A 

TRAINING EQUIPMENT AN/APN-T1 


Mounting 

Indicator 

Mounting 


Mounting 

Radio Frequency Generator 

Code Selector 

Double Deck Cabinet 

Inverter Unit 

Control Panel 

and includes plugs, adapters, wire and misc. cable. 

July 1945 

Nomenclature 

BC-800-A 

FT-416-A 

BC-929-A (2 each) 

FT-409-A (2 each) 

BC-1145-A 

FT-406-A 

O-6/APN-T1 

KY- 2/AP -T1 

PE-115- : 

BC-703- P% 


Size 

13" x 13" x 9" 

12" x 10" x 3" 

9" x 9" x 16" (ea) 

15" x 9" x 2" 

3"x 4" x 8" 

7" x 4" x 2" 

9" x 19"'' x 15" 

9" x 19" x 15" 

I 12" 'x 8"x 1 2' 

\ " >x 10" 12'K 

Weight 

34 Lbs. 

3 Lbs. 

26 Lbs. 

3 Lbs. 

2 Lbs. 

3 Lbs, 

18 Lbs. 

36 Lbs. 

36 Lbs. 

33 Lbs. 

20 Lbs. 


Beacon Antenna Assembly AN/CPA-1 is an air 

transportable adapter equipment used to convert Beacon 

Transmitter-Receivers AN/TPN-1, AN/TPN-2 or AN/TPN- 

3for blind approach of aircraft equipped with interrogator 

responsor equipments, such as Radio Set AN/APN-2 or 

SCR-729 under adverse weather conditions. Approaches can 

be accomplished to within one mile of a runway. The actual 

landing is then accomplished visually. 

This assembly consists of a collapsible triangular 

frame-like antenna reflector, and a switching unit for 

alternating the antenna leads. This set when used with the 

radar homing beacon, will form a "BABS" system, similar 

to Radio Set AN/CPN-7. 

Switching Assembly SA-7/CPA-1. 

Antenna System AS-30/CPA-1 assembled for operation. 

AN/CPA-1 

Power is obtained from 110 volts, 50-60 cycle 

power source or from a 24 volt dc. source utilizing an inverter. 

Power input is 20 watts. The equipment operates 

over a frequency range of 214 - 234 mc. 

AN/CPA-I requires no special test equipment 

for maintenance or operation. 


1945. 

POWER INPUT 20 WATTS @ 110 

VOLTS 

FREQUENCY 214 - 234 MC 

: 

Vii~! 

Inverter Unit PP-76/CPA-1. 

RADAR ANTENNA ASSEMBLY AN/CPA-1 TOTAL WEIGHT 155 LBS. 

Component 

Antenna System 

Switching Assembly 

Inverter Unit 

and includes plugs and cords. 

July 1945 

Nomenclature 

AS-30/CPA- 

SA-7/CPA-1 [I 

PP-76/CPA .1 

1 - -' 

6 'x 7 

Size 

,,,?4, 

Weight 

90 Lbs. 

27 Lbs. 

10 Lbs. 


Radio Set AN/CPN-2 is the ground portion of 

the precisionaircraft navigational system known as Shoran 

which employs radar ranging and beacon principles. This 

system is used for precision navigation, permitting positioning 

of aircraft within 75 feet of any point in the range 

of the system. 

Shoran consists of one aircraft equipment (AN/ 

APN-3) and two identical ground station equipments (AN/ 

CPN-2). The AN/CPN-2's provide signals which are utilizedbythe 

aircraft equipment (AN/APN-3) to measure the 

distance from the aircraft to each of the two AN/CPN-2 

ground stations. Inpractice one performs the "rate" duties 

while the other acts as the "drift" station. The "drift" 

station" is the one which provides the course or arc flown 

by the navigator. The "rate" stationprovides the intersecting 

or bombing point. These indications depend on the 

plane's receiver-indicator system, i.e., a ground station 

may be a "rate" station for one airplane and a "drift" 

station for another. A maximum of 20 airborne equipments 

can use a single pair of ground beacons simultaneously. 

(For further details on the operation of Shoran re- Monitor ID-18/CPN-2 

AN/ CPN-2 

fer to Radio Set AN/APN-3.) fer to Radio Set AN/APN-3.) The following major components of AN/CPN-2 

perform the functions indicated: 

Transmitter; when interrogated by AN/APN-3 

this unit responds by transmitting a pulsed signal at the 

proper rf frequency. 

Monitor; this component contains the rf receiver 

unitfor receiving the signals from AN/APN-3. It also incorporates 

a network for controlling the overall delay of 

the station, and a master timing unit used as a reference 

standard for the airborne timer. An oscilloscope is provided 

for checking the delay and a wavemeter is included 

for checking the frequency of the rf receiver. 

Shoran may be used as an aid in photographic 

reconnaisance, aerial mapping for establishing a bombing 

line, dropping paratroopers and supplies over a pre-selected 

point, and for precision navigation of aircraft and of 

ships to the ground stations. 

Additional test equipment used in the maintenance 

of Radio Set AN/CPN-2 includes Voltmeters IS-185 

and IS-189., and Power Meter TS-305/UP. 

Radio Transmitter T-12/CPN-2 . 

POWER INPUT 1200 WATTS, 115 VOLTS, 

400 CPS; 400 WATTS, 24 

VOLTS, D.C. 


FREQUENCY 290 TO 330 MCS (TRANS- 

MITTERN, 220 to 330 MCS 

(RECE1VER~ 


PULSE LENGTH 0.55 MICROSECONDS 

PRF 930 TO 9300 CPS 

RANGE AIRCRAFT AT 40,000', 

280 MILES 

OPERATORS TWO 



5 3E29 2 705 A 

1 5X3GT 1 6E5 

13 6AC7 7 6AG5 

3 6AG7 1 2X2 

3 5R4GY 1 3BP1 

5 6H6 2 6V6GT/G 

. 6J6 1 ODS/VR-150 

9 6SN7GT 

JuLy .1945 

ANthe highest terraine 

n \a ills or buildings. 

e n 4 - Graphic Survey

AN! CPN-2 

Complete installation of Vehicular Mounting Kit for Radio Set AN/ CPN-2. 

RADIO SET AN/CPN-2 TOTAL WEIGHT 1163 

Component Nomenclature 

Transmitter T-12/( CPN-2 

Monitor ID-18/ CPN-2 with receiver 

Antenna Mast & Reflector AN-28/ /CPN-2 

Antenna Bed 

Mast Accessories 

2 Homelite Power PU-4/ CPN-2 

Type HRU-AD 

2 Gas Cans in case packed for shipment 


Size 

26" x 20" x 41" 

26" x 20" x 22" 

12" x 9" x 144" 

19" x 44" x 14" 

17" x 35" x 21" 

13" x 14" x 29" 

Weight 

209 Lbs. 

98 Lbs. 

191 Lbs. 

78 Lbs. 

195 Lbs. 

140 Lbs. 

LBS 

49 Lbs. (Ea.) 

Tidy 1945

Radio Set AN/CPN-3, is an air transportable 

radar beacon for ground installation, designed to provide 

range. direction and identification for the homing of planes 

equipped with search radars. 10 cm band. 

When attempting to home on this equipment, the 

aircraft equipped with airborne search equipment switches 

from radar "search" to "beacon" position. The signals 

from the aircraft, when received at the beacon, actuate the 

beacon transmitter, causing a group of coded pulse signals 

to be generated and transmitted to the aircraft where they 

appear as echoes on the indicator of the radar equipment. 

The distinctive keying or pulse grouping of the beacon signals 

identifies the beacon to the homing aircraft. 

Performance, in general, has been good, and 

these beacons are in operational field and training use. In 

the British Isles, the beacons are operated in pairs, one 

automatically being put into operation by the failure of the 

other. An over interrogation gate and local interference eliminator 

have been incorporated in the system. 

This equipment uses separate receiving and transmitting 

antennas; each a linear array of six elements of three 

horizontal dipoles, curved and equally spaced about a point. 

It is expected that Radio Set AN/CPN-3 will be replaced 

by Radio Set AN/CPN-8. 

Test equipment required in the maintenance and 

tuning of this equipment includes Voltmeter IS-189, Test 

Set TS-14/AP, Synchroscope TS-28/APN, Phantom Antenna 

and Attenuator TS-74/UPM, Voltage Divider TS-89/AP, 

Wavemeter TS-111/CP. 



2 417A 1 VR-150-30 

3 5U4G 1 2APl 

2 5Y3GT 1 6X5GT 

8 6AC7 1 2J37 

1 6H6 2 304TH 

3 6L6G 1 829 

4 6SJ7GT 2 1616 

17 6SN7GT 2 8020 

1 6Y6G 2 VR-90-30 

1 VR-105-30 2 6AG7 

BEACON HAS TO BE INTERROGATED BY PLANE, 

(CORRECT PULSE LENGTH SENT OUT; ALSO 

CORRECT WAVE,BY PLANE°S RADAR OPERATOR.) 

-- 

ili' 

Mast Head AS-9/CPN-S 

AN/CPN-3 

POWER INPUT 1.7 KW @ 115 VOLTS 


FREQUENCY TRANS. 3256 MC. REC. 

3267 - 3333 MC 

TYPE OF SIGNAL CODED PULSE 

TYPE OF PRESENTATION RANGE CODED DISPLAY 

ON RADAR SCREEN 

DATA SUPPLIED BEACON IDENTIFICATION, 

(TO AIRBORNE SET) RANGE AND AZIMUTH 

FROM BEACON 

MAXIMUM RANGE LINE OF SIGHT TO 100 MI. 


P~LANE LOCAT E ITS POSITION WHEN 

BEACONS CODED SIGNALS ARE RE 

1 "' ... , TURNED FROM PLANE'S INOJR 

+M- ,~ 

\,,..; \J1.-' #. T , 

L

AN! CPN-3, 

RADIO SET AN/CPN-3 

Component 


Coder 

Monitor 

Radio Transmitter 

Power Supply 

Mast Head 

Antenna Support 

and includes plugs cable adapters etc. 

Section 4 - Grakhic Surv'eyJuy14 

Radio Set AN/CPN-3 in rear of truck. 

Radio Set AN/CPN-3 front view, doors of housings open. 

Nomenclature 

anon 

R-11/CPN-3 

KY-1l/CPN- 3 

ID-13/CPN-3 

T-8/CPN-3 

PP-8/CPN-3 

AS-9/CIPN-3 

AB-2/CPN-3 includes Mast Head 20' High 

TOTAL WEIGHT 1400 

Size 

8" x 18" 

8" x 19'' 

8" x 19" 

x 13" 

x 13" 

x 13" 

43" x 4" diam. 

LBS . 

Weight 

53 Lbs. 

40 Lbs. 

27 Lbs. 

127 Lbs. 

July 1945

Radio Set AN/CPN-6, an air transportable coded 

beacon for ground installation, provides range, direction 

and identificationfor the guidance of aircraft and is similar 

to Radio Set AN/CPN-3 but operates on a higher frequency. 

This equipment is a homing beacon which, when 

used in conjunction with suitable airborne radar interrogator-responsor 

equipment, will aid aircraft in navigating 

to a designated spot on the ground. 

When attempting to home on this beacon an aircraft 

equipped with airborne interrogation equipment flies 

towardthe beacon with the interrogator operating. Signals 

from the aircraft, when received at the beacon actuate the 

beacon transmitter, causing a coded group of pulse signals 

to be generated which are transmitted to the aircraft, where 

they appear as echoes on the indicator of the interrogatorresponsor 

equipment. The distinctive keying or pulse 

grouping of the beacon signals identifies the beacon to the 

homing aircraft. The discriminator accepts 2 to 5 microseconds 

interrogating pulses, rejecting pulses shorter than 

2 microseconds or longer than 5 microseconds. A selection 

of 56 codes are available in each transmitter. 

This equipment has a linear array of slotted 

wave guide elements, 12 for the receiver and 12 for the 

transmitter. Thepatternis uniform in azimuth, 3 db down 

at 5 degrees above or below the horizontal. There is a 

special two-element broad beam antenna for shipboard installation. 

Poweris obtainedfroma 115/230 volt, 50-70 cps 

source with a power consumption of 2 kilowatts and a peak 

power output of 25 to 50 kilowatts. Maximum range of the 

equipment is 100 miles. 

AN/CPN-6 

Test equipment required for the maintenance of 

Radio Set AN/CPN-6 includes Detector Amplifier Assembly 

AN/UPA-1, Voltmeter IS-189, Synchroscope TS-28/ 

UPM, Voltage Divider TS-89/AP, Radio Frequency Test 

Load TS-108/AP, Test Set TS-120/UP. 


240 for the calendar year 1945 and 60 for 1946. 

POWER INPUT 2 KW @ 115/230 VOLTS 

50-70 CPS 

POWER OUTPUT 25-50 KW (PEAK) 

FREQUENCY TRANSMITTER 9310 

MC:RECEIVER 9320- 

9430 MC 

TYPE OF SIGNAL RANGE CODED 

RECEIVER SENSITIVITY 0,0004 MICROWATTS 


PULSE LENGTH 1/2 MICROSECOND 



1 723B 5 OD3/VR-150 

14 6AC7 1 6AG7 

7 6SN7GT 1 815 

7 6SL7GT 2 5D21 

6 5R4GY 1 2J48 

3 6B4G 2 705A 

2 6SJ7GT 2 IN23 

1 OC3/VR-105 

Radio Set AN/CPN-6 installed as ground tt o. r. 

homing -ident1foatic n ance of aircraft. 

July 1945 ection 4 - Graphic Survey

AN/ CPN-6 

Receiver Cabinet 

1 i= 

Antenna Mast Assembly (AB 42/CPN-6) 


Nomenclature 


Antenna Mast Assembly 

Transmitter-Modulator 


Coder 

Modulator Driver 

Discriminator 

Transmitter Power Supply 

Auto Transformer 

Receiver Cabinet 

Transmitter Cabinet, 

Component 

AS-119/CPN-6 

AB-42/CPN-6 

T-79/CPN-6 

R-88/CPN-6 

KY-6/CPN-6 

AM-44/CPN-6 

F-12/CPN-6 

PP-93/CPN-6 

MX-202/CPN-6 

CY-170/CPN-6 

CY-169/CPN-6 

and includes set of connecting and interconneting cords and test accessories kit. 


I 4; 4 

• 

.. Mf .. 

, & y ... 

Antenna Assembly (AS-119/CPN-6) 


Size Weight 

20" x 4" dia. 

17" x 15" x 20" 

11" x 16" x 20" 

11" x 16" x 20" 

11" x 16" x 20" 

18" x 17" x 12" 

12" x 8" x 10" 

18" x 50" x 24" 

18" x 50" x 24" 

177 Lbs. 

193 Lbs. 

115 Lbs. 

45 Lbs. 

57 Lbs. 

74 Lbs. 

45 Lbs. 

143 Lbs. 

66 Lbs. 

265 Lbs. 

265 Lbs. 

July 1945

Radio Set AN/CPN - 7, sometimes known as 

"BABS", is a modification of the airborne IFF Radio Set 

SCR-695 to form a ground, air-transportable, radar beacon 

transponder to provide a means of landing aircraft equipped 

with Radio Set SCR-729 or Radio Set AN/APN-2 

under conditions of poor visibility and low ceiling. Use of 

the equipment will permit approaches in line with and to 

within one mile of the runway and to an altitude of 200 feet, 

the actual landing being conducted visually. 

When interrogated by an interrogator-responsor 

such as SCR-729,the BABS beacontransmits abeam slightly 

off the right of the runway (as viewedfromthe approaching 

aircraft) for approximately 1 second, and then another 

to the left of the runway for about 0.2 seconds. When exactly 

on the runway, the approaching aircraft is in a field 

of constant signal strength and receives a signal of unchanging 

amplitude, this manifesting itself as a steady signal(without 

flicker) on the airborne indicator. If the air - 

plane is to the right or to the left of the runway, the amplitude 

of the signal will be different and an amplitude flicker 

will be observed on the right or left of the indicator corresponding 

to the side of the runway that the airplane may 

AN/ CPN-7 

be approaching. 

This equipment requires a 110 volts 60 cycle power 

source. 

Test equipment used in the maintenance of this 

equipment includes Test Equipment IE-46. 

POWER INPUT 95-160 WATTS, 110 V, 

60 CPS 

POWER OUTPUT 10 WATTS 

FREQUENCY RECEIVER 171-181 MC. 

TRANSMITTER 168.5 - 

178.5 MC. 


RANGE 20 MI, AT 2000 FT, 



1 5U4G 3 6H6 

3 7193 6 6SH7 

Radio Set AN/CPN-7 (BABS) is air transportabl radar beacoh tanspo~idp . c 

aircraft 9t 4I/Al equipped with Radio Set SCR-729 or Ra 

July 1945 

I~ ' 

- 


AN! CPN-7 

PS' 

Case CY-47/CPN-7 with Power Unit, 

Onan Model 358RS 

Antenna 

AT-31/CPN-7 

Antenna Mast AB-3/TPN-1 


Component 

Case 

Receiver- Transmitter 

Switching Assembly 

Antenna 

Antenna Malt 


Onan Power Plant 

Antenna System 

Mounting 


ij 

1 « 

Nomenclature 

CY-46/CPN-7 

RT-29/CPN-7 

SA-10/CPN-7 

AT-31/CPN- 7 

AB-3/TPN-1 

CY-47/CPN-7 

#358RS 

AS-48/CPN-7 

FT-242-F 

Case CY-46/CPN-7 with Mountings FT-247-F 

and Switching Assembly SA-10/CPN-7 

Receivers-Transmitters RT-29/CPN-7 

Size 

TOTAL WEIGHT 2 0 0 LBS. 

28" x 20" x 18" 

13" x 14" x 10" 

8" x 3" x 13" 

Length 18" 

Length 20' Diam. 2" 

28" x 20" x 18" 

8" x 8" x 11" Height 27" 

Weight 

45 Lbs. 

40 Lbs. 

11 Lbs. 

7 Lbs. 

45 Lbs 

July 1945

Radio Set AN/CPN-8, an air transportable coded 

beacon- -for ground installations is similar to Radio Set 

AN/CPN-3 except that AN/CPN-8 is much smaller. Designed 

to respond to 10 cm band radar sets having provision 

for beacon interrogation, provides range, direction 

and identification for the guidance of planes. 

Whenattemptingto home on this beacon, an aircraft 

equipped with airborne interrogation equipment flies 

towards the beacon with the interrogator operating. The 

signals from the aircraft, when received at the beacon actuate 

the beacon transmitter, causing a group of coded pulse 

signals to be generated and transmitted to the aircraft where 

they appear as echoes on the indicator of the interrogatorresponser 

equipment. The distinctive keying or pulse grouping 

of the beacon signals identifies the beacon to the homing 

aircraft. The discriminator rejects pulses shorter than 

2 micro-seconds or longer than 4 micro-seconds. Coding 

is provided by means of 6 code pips, making 50 codes possible. 

The antenna consists of a linear array of vertically 

stacked triple dipoles, 14 in transmitting and 14 in 

receiving antennas. It is omnidirectional in azimuth with 

7 degree vertical half powerbeam width, mounted on a mast 

so that total height is 25 feet. Usual polarization is horizontal 

but vertically polarized antennas are available. 

Radio Set AN/CPN-8 transmits coded pulses on 

3256 mc. and receives in the frequency range of 3267 to 

3333 mc. The equipment operates on 100-130 volts or 200- 

260 volts, 50-70cycles. Aninput of 1300watts produces a 

peak power output of 2.25 kw or more. The maximum range 

of the equipment is more than 100 miles. 



2 5R4GY 3 3B24 

11 6AC7 4 6X5GT/G 

3 6AG7 1 715B 

2 6B4G 2 807 

1 6SJ7 2 OD3/VR-150 

7 6SL7GT 1 5CP1 

10 6SN7GT 2 2X2 

3 OC3/VR-105 2 6H6 

1 2J38 1 446B or 2C40 

AN/CPN-8 

Airborne Equipment Records Beacon Range (distance 

from center of scope to first pip), azimuth (position on 

scope), and identity (number & arrangement of pips) 

Test equipment required for the maintenance of 

Radio Set AN/CPN-8 includes: Wavemeter TS-111/CP, Voltage 

Divider TS-89/AP, Phantom Antenna and Attenuator 

TS-74/UPM, Antenna Dipole Assy. AS-23/AP, Power Meter 

TS-125/AP, and Voltmeter IS-189. 


were 338 for the calendar year 1945 and 40 for 1946. 

POWER INPUT 1.3 KW @ 100-130 OR 

POWER OUTPUT 

FREQUENCY 

200-260 VOLTS 

2.25 KW (PEAK) 

TRANSMITTER 3256 MC 

RECEIVER 3267-3333 MC 



PULSE LENGTH 5 MICRO SECONDS 

Radio Set AN/CPN - 8 is an Air Transportable Radar Beacon designed to provide range, direction, and 

identification for homing 10 cm band radar equipped aircraft. 


AN/CPN- 8 

1. Monitor Unit TS-121(XA)CPN-8 (XA-1). 

2. Receiver Coder Unit R-56(XA)CPN-8) (XA-1). 

3. Modulator & Transmitter Unit T-50(XA)CPN-8 (XA-1) 

4. Voltage Control Unit CN-11(XA) CPN-8 (XA-1) 

RADIO SET AN/CPN-8 TOTAL WEIGHT 1900 LBS. 

Component 

Receiver Coder Unit 

Transmitter and Modulator 

Voltage Control Unit 

Monitor Unit 

Mast Head 

Mast Head 




Case (2 Operating spares) 

Transmission Line 

Transmission Line 

Cord 

and includes connecting and interconnecting cords 


Nomenclature 

R-56/CPN-8 

T-50/CPN-8 

CN-11/CPN-8 

TS-121/CPN-8 

AS-72/CPN-8 

AS-80/CPN- 8 

CY-68/CPN-8 

AB-18/CPN-8 

CY-166/CPN-8 

CY-248/CPN-8 

CG-172/CPN-8 

CG-173/CPN-8 

CG-119/U 

Size 

10" x 17" x 22" 

11" x 17 ' x 22" 

8" x 17" x 22" 

10" x 17" x 22" 

5" x 4" dia. 

6" x 5" dia. 

23" x 27" x 46" 

20' x 4" dia. 

15" x 17" x 68" 

32" x 26" x 20" 

44' long 

48' long 

I 

Weight 

73 Lbs. 

110 Lbs. 

64 Lbs. 

90 Lhs. 

25 Lbs. 

30 Lbs. 

188 Lbs. 

90 Lbs. 

110 Lbs 

450 Lbs. 

25 Lbs. 

25 Lbs. 

July 1945

Radar Sets AN/ Nl ahd AN/CPN-12 comprise 

an air-transportable ground Loran chain which provides 

a signal for position "fixing" by aircraft equipped 

with Radar Set AN/APN-4 or Radar Set AN/APN-9. In operation, 

two AN/CPN-11's are used as "slave" stations 

and are triggered by the double master station AN/CPN-12. 

This is lightweight equipment intended for use 

in operations where time will not permit the installation of 

heavier conventional fixed or mobile Loran equipment, and 

in other installations where the latter equipment is considered 

impracticable for other reasons. 

The standard airborne Loran receiving equipment 

AN/APN-4 is used as the basic timing device. Each 

station includes 100 percent spare components with 200 

percent spare power supply components. Equipment is designed 

for continuous 24 hours per day operation for at 

least three months. Components are interchangeable in 

AN/CPN-11 and AN/CPN-12. 

Test equipment required for the operation and 

maintenance of AN/CPN-11 includes General Radio Wave 

Meter (566A), Simpson Test Meter (1 - 189), Oscillo- 

AN/CPN-11 

scope 3" Dumont 224A, Signal Generator 1-72, and Hickok 

Model 110. 

POWER OUTPUT 25 KW. (PEAK) 

FREQUENCY 1700 - 2000 KC. 

-TYPE OF SItGNAL PUL-SE 



2 5D21 18 6H6GT 

2 807 20 6SL7GT 

6 3B24 2 2050 

50 6SN7GT 2 5CP1 

6 5U4G 2 6V6GT 

4 OC3/VR-105 4 2X2 

10 6B4G 2 6SA7/GT 

4 6SJ7GT 8 6SK7GT/G 

12 6AC7 

Radar Sets AN/CPN-11 and AN/CPN-12 constitute an air transportable 

properly equipped aircraft with means whereby they ax x 

of 200 miles by day and 400 miles at night. 

July 1945 

ihich provides 

hin the range 

4 - Graphic Surv'ey

AN/CPN-11 

Timer Cabinet 


RADAR SETS AN/CPN-11 TOTAL WEIGHT 13,000 LBS. 

Component 


Ground Kit 



Synchronizer 


Antenna Mast 

Power Unit 

Indicator 

Junction Box 

Junction Bo . 

Timer Cabinet Assembly 

Antenna Coupling Unit 

Antenna Couplir Unit 

Radar Decelver 

Nomenclature 

AS-130/CPN 

MX-209/CPN 

CY-173/CPN (2 each) 

T-82/CPN-(2 each) 

SN-16/CPN (2 each) 


AB-46/C (4 each) 

PU-6/TPS-1 (4 each) 

ID-102/CPN (2 each) 

J-111/CPN (2 each) 



CU-76/CPN (2 each) 


R-133/CPN (2 each) 

and includes tent, shelter assembly, set of interconnecting cables 

and fittings including r-f transmission lines and tool equipment set 


Size 

29" x 21" x 24" 

24" x 24" x 40" 

10" x 24" x 29" 

30" x 30" x 18" 

Length 60' 

20" x 20" x 30" 

9" x 12" x 20" 

2" x 3" x 15" 

2" x 3" x 15" 

21" x 24" x 29" 

10" x 15" x 20" 

6" x 6" x 6" 

9" x 12" x 20" 

Weight 

600 Lbs. 

101 Lbs. 

50 Lbs. 

62 Lbs. 

750 Lbs. 

225 Lbs. 

32 Lbs. 

5 Lbs. 

5 Lbs. 

58 Lbs. 

30 Lbs. 

3 Lbs. 

25 Lbs. 

JuLy 2945

adra Sets'NI P j 1 AN/CPN-11 com- 

prise an air-transportable ground Loran chain which provides 

a signal for position "fixing" by aircraft equipped 

with Radar Set AN/APN-4 or Radar Set AN/APN-9. In 

operation, two AN/CPN-11's are used as "slave" stations 

and are triggered by the double master station AN/CPN-12. 

This lightweight equipment is intended for use 

in operations where time will not permit the installatiohn 

of heavier conventional fixed or mobile Loran equipment, 

and in other installations where the latter equipment is 

considered impracticable for other reasons. 

The standard airborne Loran receiving equip - 

ment AN/APN-4 is used as the basic timing device. Each 

station includes 100 percent spare components with 200 

percent spare power supply components. Equipment is designed 

for continuous 24 hours per day operation for at 

least three months. Components are interchangeable in 

AN/CPN-11 and AN/CPN-12. 

Test equipment required for the operation and 

maintenance of AN/CPN-12 includes General Radio Wave 

AN/ CPN-12 

Meter (566A), Simpson Test Meter (IS - 189), Oscilloscope 

3" Dumont 224A, Signal Generator 1-72, and Hickok 

Model 110. 

pOWER INPUT 115 VOLTS. 400 CYCLES I 


FREQUENCY 1700 to 2000 KC 

TYPE OF SIGNAL PUIE 



2 5D21 20 6B4G 

2 807 8 6SJ7 

6 3B24 4 2050 

96 6SN7GT 2 6V6GT/G 

10 5U4G 4 5CPl 

8 OC-3/VR-105 16 6SK7GT/G 

24 6AC7 4 6SA7GT/G 

36 6H6GT/G 8 2X2 

40 6SL7GT 

Radar Set AN/CPN-12 and AN/CPN-11 constitute an air transportable ground Loran chain which provides 

properly equipped aircraft with means whereby they may obtain a fix of position at any time within the range 

of 200 miles by day and 400 miles at night. 

July 1945 e ~ ,S 4 on - Graphic Survey

AN/ CPN- 12 

Timer Cabinet 


RADAR SET AN/CPN-12 TOTAL WEIGHT 18 000 LBS. 

Component 


Synchronizer 


Antenna Mast 

Power Unit 



Indicator 

Ground Kit 

Junction Box 

Junction Box 

Timer Cabinet Assembly 

Junction Box 




Nomenclature 

T-82/CPN (2 each) 

SN-16/CPN (4 each) 


AB-46/C (4 each) 

PU-6/TPS-1 (4 each 


AS-130/CPN 

ID-102/CPN (4 each) 

MX-209/CPN 





CUT-76/CP14 (2 each) 


R-133/CPN (4 each) 

and includes set of interconnecting cables and fittings including r-f transmission line. 


Size 

24" x 24" x 40" 

10" x 24" x 29" 

30" x 30" x 18" 

60' long 

20" x 20" x 30" 

29" x 21" x 24" 

9" x 12" x 20" 

2" x 3" x 15" 

2" x 3" x 15" 

21" x 24" x 29" 

2" x 15" 

10" x 15" x 20" 

6" x 6" x 6" 

9" x 12" x 20" 

Weight 

101 Lbs. 

50 Lbs. 

62 Lbs. 

750 Lbs. 

225 Lbs. 

345 Lbs. 

600 Lbs. 

5 Lbs. 

5 Lbs. 

20 Lbs. 

5 Lbs. 

30 Lbs. 

3 Lbs. 

25 Lbs. 

July 1945

Radar Beacons AN/CP- 16 and AN/CPN-16X 

are lightweight, air transportable sea rescue transponders 

designed to facilitate the location of life rafts by radar equipped 

searching aircraft. AN/CPN - 16 is designed for 

multiplace rafts while AN/CPN-16X is designed for singleplace-raft 

installation. It operates in conjunction with and 

provides range and azimuth information to such radars as 

SCR-521-A, SCR-729-A and AN/APN-12. No special skill 

is required for the operation of the unit. 

In operation this equipment may be automatically 

interrogatedby a searching aircraft, or it may be operated 

in morse code fashion by the life raft occupant. A monitoring 

circuit is provided whereby the pilot may search 

for aircraft in his vacinity and monitor the units transponder 

action. A continuous operating life of at least 30 hours 

is expected under most conditions. 

The collapsible antenna mast is approximately 

59 inches high when extended and is vertically polorized. 

It is so constructed that it mounts into the life raft socket 

normally provided for a corner reflector target. 

Although the pulse transmitted by AN/CPN-16 

is four miles long an experienced scope operator encounters 

very little difficulty in tracking to a point directly 

over the raft. The expected range for this beacon is 50 

miles against the above radars. 

This unit is similar to AN/CPT-2 in application 

only. It will eventually replace it. 

Test Equipment IE-45 is used for the maintenance 

of AN/CPN-16 and AN/CPN-16X. 



1 455A 1 1D8GT 

AN/ CPN- 16 

(AND AN/CPN-16X) 

Sea Rescue Beacon Transmitter CPN-16, 16X for use 

in one-man life rafts. 

POWER INPUT "A" BATTERY; 1.5 VOLTS 

200 MA 

"B" BATTERY: 135 VOLTS 

POWER OUTPUT 0.5 WATTS (PEAK) 

FREQUENCY 176 MCS. 



PULSE LENGTH 10 MICROSECONDS 

(APPROX.) 

I 

4 K 4 

V I iv 

Components of Radar Beacon AN/CPN-16 

RADAR BEACON AN/CPN-16 TOTAL WEIGHT 6 LBS. 

Component 


Battery Case 

RADAR BEACON 

Component 



July 1945 

Nomenclature 

RT-103(XA)CPN 

CY-439(XA-3)/CPN-16 (XA-2) 

AN/CPN-16X 

Nomenclature r 

I" 

Size Weight 

2" x 3" x 15" 

10" x 5" x 3" 

RT-103(XA)CPN X -x3' ' 

CY-440 (XA-1)/CPN-16(XA-1) u- 40g' P 'd 

1 Lb. 

5 Lbs. 


Weight 

1 Lb. 

4 Lbs. 


Radar Set AN/CPT-2 

is a lightweight, air transportable, 

sea rescue beacon 

intended for use by a fighter 

pilot forced down on over - 

water flight. Used in oneman 

life rafts, this set enables 

searching aircraft, equipped 

with radar sets such 

as SCR-521, SCR-729 and 

AN/APA-12, to locate the 

raft. No special skill is required 

for operation. 

The above oscilloscope pattern illustrates how 

a typical signal from AN/CPT-2 will appear on the radar 

receiver-indicator located in the searching aircraft. 

An improved higher-powered version of this sea 

rescue beacon for single or multiplace rafts is now under 

development. It will operate on the crossband principle 

and contain such additional features as monitoring facilities 

and coded output signals. See AN/CPN-16 for further 

information. 

AN/CPT-2 will transmit continuously at 176 mc. 

with a range of approximately 12 to 18 miles, permitting 

direction finding (DF) bearings to be taken on the equipment. 

Range of the aircraft from the beacon cannot be determined 

directly although a rough idea of range is indicated 

by the signal intensity. 

Frequency stability is achieved by careful construction 

of the transmitter circuits and by choosing the 

batteries so the plate voltage does not vary appreciably 

during the life of the beacon. Pulse rate is 45 kc, plus or 

minus 5 kc. Frequency is adjustable from 166 to 186 mcs. 

Continuous operating life of the beacon is at least 

30 hours at normal temperatures, decreasing to about 12 

hours at zero temperature. 

Radar Set AN/CPT-2 (XA-3) 

RADAR SET AN/CPT- 2 

Component 

Beacon and Antenna 

Battery (2 ea.) 

Battery 

* Weight less than one pound. 

July 1945 

Nomenclature 

BA-30. 

3A-38-R 

UNGLASSIFIED 

tIG'ASS:FIS 

AN/CPT -2 

Radio Set AN/CPT-2 is installed in life raft after being 

forced down and operates automatically. 

After the signal is picked up, the searching aircraft 

is turned to give equal strength on both sides of the 

screen. A sudden decrease in signal strength indicates 

passing directly over the raft. 

Power source for Radar Set AN/CPT-2 is two 

1-1/2volt "A" batteries and one 93-1/2 volt "B" battery. 

This set is similar in purpose to the British T- 

3180 (Walter) butis improved mechanically and is designed 

for American production techniques. 

Test equipment required for use in maintenance 

and operation of the equipment includes Test Equipment 

IE-56-A and Signal Generator BC-906-C or D. 


5,000 for the calendar year 1945. 

POWER SOURCE BATTERY 

POWER OUTPUT 100 MILLI WATTS 

FREQUENCY 176 MC 


ANTENNA 2 QUARTER-WAVE 

DIPOLES 




1 3A5 

Size 

2" x 15" x 5" 


Weight 

3 Lbs. 


Beacon Transmitter Receiver AN/TPN-1 is an 

air transportable ground beacon responder consisting of a 

modified SCR-695, power supply, and antenna. This device 

when in operation, and only when interrogated by the proper 

airborne equipment, emits a radio signal which, when 

interpreted by suitable apparatus, provides navigational information 

for homing purposes. 

This equipment is used in conjunction with Radio 

Set AN/APN-2 by the Troop Carrier Command for marking 

glider landing and drop zones, 

Beacon Transmitter Receiver AN/TPN-1 (Big 

Eureka) weighs 150 pounds. It can be set up in about half 

an hour and requires no operator once it is turned on. 

The equipment is operated from a 24-volt battery 

witha power input of 90 watts producing a power output 

of 15 watts over a frequency range of 214 to 234 mc. 

Its operating range is approximately 90 miles. 

Test equipment used in the maintenance and operation 

of the.equipment includes IE-46-B and IE-45. 

There were no Army Supply Program requirements 

as of 1 February 1945. 

I 

POWER INPUT 

POWER OUTPUT 

FREQUENCY 

90 WATTS, 24 V. DC 

15 WATTS (PEAK) 

214 - 234 MC (REC. AND 

TRANS) 





3 7193 6 6SH7 

3 6H6 

H 

AN/TPN-1 

AN/TPN-1 packed in Case CY-21/TPN-1 is air transportable 

and easily assembled. 

Beacon Transmitter Receiver AN/TPN-1 is an air transpo r bac l ate) u a ; ed to 

guide tow planes and gliders to predetermined disembarkati n.es. " 

JuLy 1945 t s Go tfWhic Survey

AN/TPN-1 

Control Equipment' 

RC-255-A 

Headset 

HS-23 

-Au 

Aircraft Battery 

Type G-1 

1/ 

P1 

Mv(odified Radio 

Receiver BC-966-A 

Antenna Mast 

Transmission Lines Case 

(Antenna) 

BEACON TRANSMITTER RECEIVER AN ITPN-1 TOTAL WEIGHT 

Component 


Antenna Mast 

Modified Antenna 

Modified Radio Receiver 

Radio Control Equip 

Air Corps Type G-1 Battery 

Section 4 - Graphic Svrvey 

Nomenclature 

CY-21/TPN-1 

AB- 3/TPN- 1 

AN- 95-A 

BC-266-A 

RC-255-A 

Size 

28" x 20" x 18" 

11'' x 2" 

14" x 4" 

13" x 14" x 10" 

6" x 7" x 3" 

10" x 10" x 11" 

Modified 

Antenna AN-95 

240 LBS 

Weight 

47 Lbs 

5 Lbs 

1 Lbs 

36 Lbs 

3 Lbs 

77 Lbs 

JuLy 1945

Beacon Transmitter Receiver AN/TPN-3 is an 

air transportable ground beacon used in conjunction with 

Rebecca Mark I, II, Ill, Radio Set AN/APN-2 and Radio Set 

AN/APN-5. Provides homing facilities for Troop Carrier 

Command squadrons and BABS facilities when used in conjunction 

with Beacon Antenna Assembly AN/CPA-l. 

This equipment consists of a lightweight modified 

Radio Set SCR-695 housed in a single chest, which may 

easilybe carried be two men, and can be set up for operation 

in approximately 15 minutes. 

Powerfor operation of Beacon Transmitter Receiver 

AN/TPN-3 may be obtained from a local 115 or 230 

volt, 50-60 cycle power supply. When being used in enemy 

territory, powercanbe supplied from any one of a number 

of suitable power supply equipments that can also be transported 

with this equipment. 

Test Equipment IE-45 and IE-46-B may be used 

for maintenance and tuning. 

POWER INPUT 70 WATTS 


FREQUENCY 214 MC TRANSMITTER 

AND 234 MC RECEIVER 


RANGE 90 MILES (LINE OF 

SIGHT) 



3 7193 5 6SH7 

2 6H6 1 5U4G 

AN/TPN-3 

7:, i jFii ii , 

Beacon Transmitter-Receiver AN/TPN-3 

Beacon Transmitter AN/TPN-3 is an air transportable Radars Beacon providing homing facilities tb toop 

carrying aircraft under conditions of poor visibility. 

July 1945 Section 4 - Gra c Survey

AN/TPN-3 

BEACON 

Component 

Modified Radio Receiver 

Modified Antenna 

Antenna Mast 


Antenna Mast AB-3/TPN-1 


TRANSMITTER 

RECEIVER 

Nomenclature 

BC-966-A- 

AN-95-A 

AB-3/TPN- 1 

CY-21/TPN-!1 

Receiver-Transmitter RT-14/TPN-3 

Cord CX-74/TPN-3 

Antenna AT-16/TPN- 

Cord CX-16/TPN-1 Headset HS-23 

AN/TPN - 3 TOTAL WEIGHT 100 LBS. 

Size 

13" x 14" x 10" 

14" x 4" Diam. 

121" x 2" Diam. 

28" x 20" x 18" 

Weight 

47 Lbs. 

2 Lbs. 

4 Lbs. 

47 Lbs. 

July 1945

Radar Beacon AN/UPN-1, sometimes known as 

BUPS, is an ultra portable beacon for ground, paratroop 

or shipboard use having a range of 35-50 miles. The set 

is capable of being interrogated by airborne radars operating 

on beacon function and replying with a coded signal 

permitting the beacon to be located in range and azimuth. 

Capable of transmitting five different codes, this 

beacon is housed in a rectangular chassis containing a con - 

trol panel with a knob for selecting operation (on-off-standby-tune), 

a knob for selecting codes and a knob for tuning 

the transmitter. The antenna consists of a dual linear array 

of six dipoles each (receiving and transmitting) housed 

in a weatherproof plastic cylinder and having horizontal 

polarization. It transmits signals on 3256 mc. and receives 

over the frequency range of 3267 to 3333 mc. 

Power is obtained from a special 12 volt battery 

pack with power input of 36 watts. Peak Power output 

of the equipment is 50 watts. 

Twelve experimental d-c units were built for field 

tests and are now in operational use. Production deliveries 

were being made in April 1945. 

Test equipment used in the maintenance of Radar 

Beacon AN/UPN-1 includes Test Set TS-3/AP, Test Set 

TS-14/AP, Oscilloscope TS-34/AP, Voltmeters IS-185 and 

189, and Audio Oscillator Hewlett-Packard 200C. 


1945 were 672 for the calendar year 1945 and 45 for 

1946. 

Aircraft Interrogation Triggers Beacon Reply which establishes 

its identity & position in range and azimuth. 

July 1945 

AN/UPN-1 

Battery Charger & Battery in carrying position-entire 

equipment may be packed in 2 packages & carried by 

one man. (1) Harness MX-253/UPN-1 (2) Rectifier 

Battery Charger PP-116/UPN (3) Battery Case CY- 

222/UPN-1. 

POWER INPUT 36 WATTS AT 12 VOLTS 


FREQUENCY RECEIVER 3267-3333 MC 

TRANSMITTER 3256 MC 


TYPE PRESENTATION CODE DISPLAY ON THE 

RADAR SCREEN 

DATA SUPPLIED 

(TO AIRBORNE SET) IDENTIFICATION, 

RANGE AND BEARING 

FROM BEACON 

RANGE 35-50 MILES AIRBORNE 

RADAR TO GROUND 

PULSE LENGTH 0.5/MICROSECONDS 



5 1LN5 

2 7F8 t 1 t 446 

6 ./7 [29 N7 

ectto 4 Survey

AN/UPN-1 

Bittery Case CY-222/UPN-1 

Rectifier Battery Charger 

PP-116/UPN-1 

Receiver Transmitter RT-72/UPN-1 

RADAR BEACON AN/UPN-1 


Transponder Assembly 


Harness 

*Chest 


Rectifier Battery Charger 

Harness 



Cord 

Cord 



*includes operating spare parts 

**weight less that one pound. 


Harness MX-252/UPN-1 

Case CY-225/UP 

RT-72/UPN-1 

CY-220/UPN-1 

MX-242/UPN-1 

CY-221/UPN-1 

CY-222/UPN-1 (2 each) 

PP-116/UPN-1 

MX-253/UPN-1 

AS-172/AP 

AS-171/UP 

CX-237/U 

CG-92/U (2 each) 

AB-49/UP 

CY-225/UP 


AS-171-UP 


AB-49/UP 


Size 

13" x 7" x 13" 

13" x 7" x 15" 

13 "x 13"'' x 9" 

7" x 8" x 11" 

7" x 8" x 11" 

4" x 7" x 14" 

25 1/2" x 4" Diameter 

50' 

4' 6" long 

32" high 

6" x 6" x 40" 

Weight 

27 Lbs. 

8 Lbs. 

1 Lb. 

12 Lbs. 

25 Lbs. 

14 Lbs. 

1 Lb. 

5 Lbs. 

10 Lbs. 

2 Lbs. 

** 

7 Lbs. 

1 Lb. 

July 1945

Radar Beacon AN/UPN-2, sometimes known as 

BUPS, is an ultra portable beacon for ground, paratroop 

or shipborne use with a range of 35-50 miles. It is similar 

to AN/UPN-1 except for power source. The airborne 

version of AN/UPN-2 is known as Radar Beacon AN/APN- 

29. The set is capable of being interrogated by airborne 

radars of the proper frequency on beacon function and replying 

with a coded signal permitting the beacon to be located 

in range and azimuth. 

This beacon is housed in a rectangular chassis 

containing a control panel with a knob for selecting operation 

(on-off-standby-tune), a knob for selecting codes, and 

knob for tuning the transmitter. It transmits signals on 

3256 nic. and receives over the frequency range of 3267 to 

3333 mc. 

Power input of 150 watts, 50-2400 cycles, 115 

or 230 volts produces a peak power output of 50 watts. 

Radar Beacon AN/UPN-2 requires a ground Antenna 

Assembly AS-171/UP consisting of a dual linear array 

of six dipoles each (receiving and transmitting) housed. 

in a weatherproof plastic cylinder and having horizontal 

polarization. 

Twelve experimental ac units were built for field 

tests and are now in operational use. Production deliveries 

were being made in April 1945. 

Test equipment used in the maintenance of Radar 

Beacon AN/UIPN-2 includes Test Set TS-3/AP, Test Set 

Radar Beacon AN/UPN-2 on being interrogated by airborne 

the beacon to be located in range and azimuth. 

July 1945 

SAN/UPN-2 

TS-14/AP, Oscilloscope. TS-34/AP, Voltmeters IS-189 

and IS-185, and Audio Oscillator Hewlett-Packard 200C. 


1945were 304forthecalendaryearof 1945 and 18 for 1946. 

POWER INPUT 150 WATTS AT 115/230 

VOLTS, 50-2400 CPS 


FREQUENCY . RECEIVER: 3267 TO 3333 

MC; TRANSMITTER: 

3256 MC 



SENSITIVITY (RECEIVER) 0.05 MICROWATTS 


BLANKING GATE LENGTH 500 MICROSECONDS 



3 6AK5 1 OD3/VR-150 

7 6SL7GT 1 10-4B 

1 2X2 1 446B 

2 2C26 2 OC3/VR-105 

1 5R4GY 2 IN27

AN/UPN-2 

Receiver Transmitter RT-73/UPN-2 

In Case CY-223/UP-2 

RADAR BEACON AN/PN- 2 


Transponder Assembly 


Harness 

*Chest 



Cord 


Cord 

* includes operating spare parts 

** weight less than one pound, 


RT-73/UPN-2 

CY-223/UPN-2 

MIX-254/UPN-2 

CY-224/UPN-2 

AB-49/CP 

CY-225/CP 

CX-237/U 

AS-171/UP 

CG-92/U (2 each) 


AS-171/UP Mounted On 

Antenna Support AB-49/UP 

Size 

7" x 14" x 20" 

7" x 13" x 21" 

32" high 

6" x 6" x 40" 

50' 

36" x 4" Diameter 

5' 


Weight 

40 Lbs. 

5 Lbs. 

1 Lb. 

12 Lbs. 

5 Lbs. 

1 Lb. 

2 Lbs. 

10 Lbs. 

** 

July 1945

Radar Beacon AN/UPN-3 (BUPX) is a portable 

set designed for use as a navigation and homing beacon and 

for bomb run designation. When interrogated by airborne 

radars onbeaconfunctions it transmits a range coded signal 

identifying the beacon so that it may be located in range 

and azimuth. 

Twelve code combinations are selectable. Provision 

is made for earphone monitoring of the set for interrogation. 

The complete equipment, less power supply source, 

but including the antenna is suitable for transportation by 

two men with harness pack or a small trailer or jeep and 

for mounting therein for operation from any location. Antenna 

consists of a linear array of coaxial fed horizontally 

polarized, vertically stacked dipoles. There are 10 rows 

of probe fed slots, 4 in each row, giving a 3600 azimuth 

pattern. This set formerly designated AN/PPN-6, will 

operate in conjunction with the following Radio Sets: AN/ 

POWER INPUT 300 WATTS @ 115 V 

50-400 CPS 


FREQUENCY 9320-9440 MC. 

TYPE OF SIGNAL RANGE CODED PULSE 

RANGE 50 MILES AN/APQ-13 

@ 10,000'; 30 MILES 

AN/APS-4 @ 10,000'; 

100 MILES AN/APS-10 

( 1, 0,000 ' 

SENSITIVITY (RECEIVER) 2 x 10-9 WATTS 



14 7F8 1 VR-105/30 

7 6AK5 1 VR-150/30 

1 2J41 1 6X5GT 

1 3D21 1 5Y3GT 

2 2X2A 1 2K25 

1 6L6 2 IN23 

1 5T4 1 IN23B 

1% 4.~%1, 

Radar Beacon AN/UPN-3 

AN/UPN-3 

APS-3,AN/APS-4, AN/APS-10, AN/APS-15, AN/APQ-13. 

Test equipment required in maintenance and operation 

of AN/UPN-3 includes Test Set TS-120/UP, Voltage 

Divider TS-89/AP, Voltmeter IS-189, Spectrum Analyzer 

TS-148/UP, Oscilloscope TS-239/UP, Radio Frequency 

Test Load TS-108/AP. 

Radar Beacon AN/UPN-3 (BUPX) is an ultra portable ground, pa troop ard ipri 'be n g is 

provide navigation information, act as homing beacon and desig~ obris. J 


AN/UPN-3 

Cordage 

Container 

Rectifier Power Unit 

PP-156 (XA) /UPN-3 (XA-1) 

In Case 

CY-355 (XA) /UPN-3 (XA-1) 

RADAR BEACON AN/UPN-3 

Component 

Receiver- Transmitte r 


Mounting 

Harness 



Harness 



Cord 

Cord 

and includes set of interconnecting cords. 

Section 4 - Grk hic Survey 

Nomenclature 


AS-241 (XA) /UPN-3 (XA-1) 


RT-84 (XA) /UPN-3 (XA- 

In Case 

CY-354 (XA) /UPN-3 (XI 

RT-84/UPN- 3 

CY- 354/UPN- 3 

MT-273/UPN-3 

ST-105/UPN- 3 

PP-156/UPN-3 

CY-255/UPN-3 

ST-104/UPN-3 

AS-241/UPN-3 

CY-356/UPN-3 

CX-770/U 

CX-789/UPN-3 

Mounting 

373 (XA) /UPN-3 (XA-1) 

TOTAL WEIGHT 

12 4 LBS. 

Size Weight 

30% long 

30':'long 

39 Lbs. 

22 Lbs. 

42 Lbs. 

15 Lbs. 

July 1945

Radar Beacon AN/UPN- 4 (BUPX) is an ultra 

portable ground and shipborne beacon weighing approximately 

97 pounds and designed to provide navigation information, 

act as homing beacon, and designate bomb runs. 

When interrogated by an airborne radar, it replies with 

Scoded signalwhich identifies the beacon and its location. 

This set differs from Radar Beacon AN/UPN-3 

in that it operates from a self-contained storage battery 

which has a life of 4 to 6 hours without recharging, and is 

suitable for transportation in small trailers or jeeps and 

maybe mounted thereinfor operation. This model is being 

considered for paratroop use. 

Five coded combinations are possible with this 

equipment. The antenna consists of a linear array of coaxial 

fed, horizontally polarized dipoles, vertically stacked, 

with 3600 azimuth pattern. 

Radar Beacon AN/UPN- 4 formerly known as 

AN/PPN-7 is used with airborne Radar Set AN/APS-3, 

Radio Sets AN/APS-4, AN/APQ-13 and Radar Equipment 

AN/APS-15. 

Test equipment recommended for use in the operation 

and maintenance of AN/UPN-4 includes Test Set 

TS-120/UP, Oscilloscope TS-239/UP, Radar Maintenance 

Equipment AN/UPM-1 A, Synchroscope TS-28/UPN, R-F 

Test Load TS-108/AP, Spectrum Analyzer TS-148/UP, 

Pressurizing Kit MK- 20/UP, Voltmeter IS - 189, Multimeter 

TS-352/U and Tube Tester 1-177. 



6 3A5 2 VR-150 

6 1L4 1 VR-90 

4 6C4 1 1N23A 

1 3D21A 1 1N31 

1 2J41 

4,001loomm 

AN/UPN-4 

POWER INPUT 12 VOLTS DC, 45 WATTS 


FREQUENCY 9320 - 9430 MC REC. 

9310 MC TRANS. 



virERt0 ,At =O.4 

aWm AI/RCRAF I 

/ TR(6IGGER BE t N 

1 RL 1~7 t. 

W/i H CLOB!) /AA 

Radar Beacon AN/UPN-4 is an ultra portable ground, paratroop and shipborne beacon designed to provide 

navigation information, act as homing beacon and de g.rtecruns t . ?N..ith radars 

operating in its frequency range. it"h r s 

July 1945 -e t;on 4 Graphic Survey 

A' lid&

AN/UPN-4 

Mounting MT-363 (XA)/ UPN-4 (XA- 1) 

(In Folding Position) 

Battery Pack BB-222(XA)/UPN-4(XA-1) 

.W Receiver- Transmitter RT-83 (XA)/UPN-4 (XA- 1) 

In Case CY-336(XA)/UPN-4(XA-1) (Antenna Erected) 

RADAR BEACON AN/UPN-4 TOTAL WEIGHT 97 LBS. 

Component 

Nomenclature 


RT-83/UPN-4 


CY-336/UPN-4 


Power Pack 

Harness 


Harness 

Mounting 

AS-235/UPN-4 

BB-222/UPN-4 (2 each) 

ST-103/UPN-4 

CY-338/UPN-4 

ST-102/UPN-4 

MT- 363/UPN-4 

Antenna Guard attached to Case CY-336/UPN-4 

and includes set of interconnecting Cords. 


26" 

24" 

10" 

Size 

x 13" x 10" 

long 

x 7" x 6" 

8" x 13" x 12" 

34" x 7" x 7" 

28" x 5" x 4" 

Weight 

35 Lbs. 

18 Lbs. 

4 Lbs. 

ea. 27 Lbs. 

2 Lbs. 

14 Lbs. 

1 Lb. 

10 Lbs. 

July 1945.

Reflector Target MX-137/A is a cl.1 psible 

assembly of monel metal mesh and telescpirig--dralumin 

tubing. When set up for operation it forms eight corner 

reflectors designed to provide dependable response to any 

S or X band radar equipped search aircraft within a six to 

tivelve nautical mile radius. The reflector assembly is 

small, lightweight, of simple construction and maybe packed 

in the standard one-man life raft package. 

Purpose of this equipment is to provide one-man 

life rafts with a suitable reflecting surface for facilitating 

the location of rafts by aircraft equipped with search radar. 

Reflector Target MX- 138/A is designed for multiplace 

rafts and is similar in construction to MX-137/ A 

exceptthatthe mesh is of heavier fabric and the supporting 

arms do not telescope on the MX-138/A. 

Reflector Target MX-138A/A is similar to MX- 

138/A except it includes an oar coupling attachment suitable 

for the various Army oar sizes. 

REFLECTOR 

Component 

Reflector Target 



July 1945 


MX-137/A, MX-138/A and MX-138A/A 

TARGET TOTAL WEIGHT 2 

Nomenclature 

MX-137/A 

MX-138/A 

MX-138A/A 

YOT~F~ 

RANGE MX-138/A AN/APS-2 - 12 TO 18 MILES 

RANGE MX-138A/A AN/APS-3 - 5 MILES 

SCR-717-B - 12 MILES 

ANTENNA TWELVE TRIANGULAR 

REFLECTING ELEMENTS 

OF KNITTED FABRIC 

SILVER-PLATED 

Size 

2''x2"xlP6" (col ps d~ 

2"k'" 2' ". (poll d I 

Sit- Graphic 

LBS. 

Weight 

2Lbs. 

2Lbs. 

2Lbs. 

Survey

Radio Set SCR-718-C is an altimeter equipment 

used-in aircraft to determine absolute altitude above terrain. 

It provides indication of actual altitude above terrain 

rather than altitude above sea level as indicated by barometric 

altimeters. 

Designed for comparatively accurate altitude indication, 

this set has two scale ranges - 0 - 5,000 ft., 0 - 

50,000 ft., however ranges in excess of 40,000 ft. are considered 

unreliable. Considerable utilization of this equipment 

has been effected in aircraft used for high-level precision 

bombing, weather reconnaissance, topographic recognition, 

and photographic missions. 

Essential principle of this equipment operation 

is the same as any radar device, namely: the transmission 

of pulses of radio energy; the reception of the pulse after 

reflection from the earth's surface; and the measurement 

of the time elapsing between transmission and reception. 

Selection of either range scale may be effected 

by use of the switch, mounted on the Indicator Unit, which 

changes the oscillator frequency and sweep rate. In altitude 

determination of ranges in excess of 5,000 ft., the 0 - 

50,000 ft., range scale is normally used, however, a more 

accurate determination of altitude may be effected by use 

of both the low and high range scales, switching alternately 

from one to the other. This feature is the principal improvement 

in this equipment over the predecessor equipments 

SCR 718-A and SCR 718-AM, which have only one 

scale, 0 - 5,000 ft. 

Test equipment required for the maintenance and 

tuning of SCR-718-C is: Test Set TS-10B/APN or TS-10C/ 

APN, Test Set TS-23/APN and RCA 158 Oscilloscope, or 

equal. 



3 6J6 1 6L6 

12 6AG5 1 2X2A 

1 5Y3GT/G 1 3DP1-S2 

UricLASaiF1I3 

SCR- 718-C 

Indicator I-152-( ) installed in aircraft. 


10,353 sets for the calendar year 1945, and 10,292 sets for 

1946. 

POWER INPUT 135 WATTS @ 80-115 V. 

POWER OUTPUT 6-10 WATTS (PEAK) 

FREQUENCY 440 - 5 MC. 


RANGE 0-40,000 FT. 

ACCURACY + (50 FT. PLUS 0.25% IN- 

DICATED ALTITUDE) 

ANTENNAS 1 TRANSMITTING AND 

1 RECEIVING HALF-WAVE 

Radio Set SCR-718 is a precision altimeter which records the absolute altitude of an aircraft above the terrain, 

regardless of air pressure or variations in temperature. 

Jul y 1945 

Jul 

; Section 4 - Graphic Su -'iy vey 

DIPOLE.

SCR-718-C 

Radio Receiver and Transmitter BC-788-(). 

Indicator 1-152-() 

RADIO SET SCR-718-C 

Component 

Indicator 


Antenna (2ea) 


Mounting 

Visor 

and includes plugs, adaptors, cable etc. 


Nomenclature 

I-152-() 

BC-788-() 

*AT-4/ARN-1 

*MT-14-ARN-1 

FT-445-A 

M-387 

u .41P A B - 

L 

Visor M-387. 

Size 

7" x 13" x 7" 

16" x 9" x 8" 

8" x 12" x 1" 

Antennas *AT-4/ARN-1. 


Weight 

10 Lbs. 

10 Lbs. 

Ju y 1945,, 

July 1945

Model YJ Radio Equipment is a two-channel, automatic 

responding radar beacon ("racon") used by the 

Navy for shore installation. This equipment will automatically 

transmit coded signals in reply to interrogating signals 

from craft equipped with radar equipment operating 

in the 176 mc. and the 515 mc. band. 

An aircraft or ship equipped with appropriate 

radar equipment may interrogate and receiye a resppnse 

from any YJ beacon within its range. The coded signal 

from the beacon is presented visually on the indicater of 

the airplane, indicating relative direction and range from 

the beacon. 

In operation the transponder replies to a repetitive 

pulse-type signal transmitted by the interrogating 

radar equipment. This signal is picked up by the antenna 

of the transponder and is passed through the receiver circuit. 

The output of the receiver is of a pulse character 

and causes the transmitter to emit a similar pulse. The 

response is keyed with one or two letters of the International 

Morse code (dot and dash) for identification purposes. 

Whenthe beacon receives two (or more) interrogating 

signals on the same channel at the same time, it 

tries to reply to each, pulse-for-pulse. So far as the equip- 

- YJ 

ment is concerned it is receiving and replying to a single 

interrogation of twice the repetition rate; however, if two 

interrogating pulses arrive at or about the same instant, 

the equipment may reply as to one pulse. 

Test Equipment required in the maintenance of 

the YJ beacon includes Radar Maintenance Equipment AN/ 

UPM-1A and Frequency Meter TS-127/U. 

POWER INPUT 150 WATTS 115/230 V, 60 CPS 

FREQUENCY 176 OR 515 MC. 





7 6SN7GT 1 807 

2 5R4GT 2 6SH7 

1 38205 2 8025 

1 6X5GT 1 829 

1 7193 1 6V6GT 

2 9004 1 955 

8 6SK7 1 

Model YJ equipment is a two channel (176mc. & 5mq bands) automatic re sondig uar beacon 

used by the Navy for shore installation. It ha

I@ , 

YJ 

MODEL YJ 

Component 


"A" Band R-F Unit 

"B" Band R-F Unit 

Housing Ass ml $ (tn 'arrying case) 

Antenna Assembly (in case) 

Accessories Cables, Plugs etc 

*Crated Weight 


4'' 

_ I~ 


Nomenclature 

CMD-20ACH 

CMD-43ABW 

CMD-43ABX 

CML-66AEY 


Size 

16" x 13" x 11" 

13" x 11" x 8" 

13" x 11" x 8" 

60" x 23" x 22" 

68" x 19' x 15" 

Weight 

57 Lbs. 

14 Lbs. 

18 Lbs. 

*197 Lbs. 

*333 Lbs. 

*76 Lbs. 

July 1945

TEST 

Equipment

0 .. 

Radar Maintenance Equipment AN/UPM-1A is a 

ground portable beacon and monitor test set used to test and 

monitor radar beacons and other equipment operating in the 

frequency range of 155-235 mc, and 460-570 mc. 

This test equipment may be used to measure or 

check transmitter frequency, power output pulse width and 

pulse shape; measure and check receiver sensitivity and 

bandwidth; measure or check pulse shape at receiver output; 

give an indication of the approximate repetition rate 

of transponders; provide for beacon monitoring; and mea-' 

sure or check delay time in transponder or beacons. 

A 3- inch oscilloscope is used as an indicatorand 

voltage measuring instrument. The usual focus, intensity 

and centering control are provided by a linear sweep of 

40, 200, or 2000 micro-seconds duration. Horizontal timing 

calibration is provided. 

Oscillators of pulse radio frequency signals are 

provided in each frequency band. They may be synchronized 

from an external source or from an internal synchronizing 

generator. 

Wavemeters with separate diode detectors measure 

the frequency of either the internal pulse signal generators 

or external pulse radio frequency signals over the 

range of 155 to 235 mc. and 460 to 570 mc. 

Antennas may be connected to the. r-f jacks for 

monitoring permanently installed equipments. When connected 

inthis way the voltage indicating detectors and fre- 

RADAR MAINTENANCE EQUIPMENT AN/UPM-IA TOTAL WEIGHT 140 LBS. 

Component 

Detector Junction Box 

Console Rack 

Dust Cover 

Oscillator (155-235 mc) 

Oscillator (460-570)mc) 

Wavemeter (155-235 mc) 

Wavemeter (460-570)mc) 

Antenna 

Cord Set 

Diode Head 

Nomenclature 

J-94/UPM-1 

MT-189/UPM-1 

CW-24/UPM-1 

O-12/UPM-1 

O-13/UPM-1 

TS-133/UPM-1 

TS-134/UPM-1 

AT-50/U 

AT-51/U 

CV-11/UPM-1 

All the above listed components are mounted or stored with 

July 1945 

Size Weight 

4" x 3" x 3" 

16" x 26" x 12" 

Console MT 189/UPM 1 " 

AN/UPM-1A 

quency meters are actuated by both internal and external 

generated signals. The r-f jacks may also be interconnectedwith 

the equipment under test through a 6-foot cable and 

shielded diode head. The probe is provided with a detector 

for indicating peak voltages (or power) at the output terminals 

of the probe. Both sensitivity and power output of associated 

equipment may be measured. 

The equipment is mounted in an all metal case 

with compartments provided for storing accessories and 

cordage. 



10 6SN7GT 3 6C4 

1 2X2 3 9005 

2 68SH7 2 9006 

1 6AG7 2 6J6 

1 OD3/VR-150 1 3BPl 

1 5U4G 

Sectin4 - Graphic Survey

~u~b~~iirn 

Test Set TS-10/APN is designed for testing 

various radio altimeter systems such as Radio Set *AN/- 

APN-1 and SCR-718. It will check low range calibration, 

will give rough check of antenna condition and power output, 

and will measure or check loop sensitivity and receiver 

alignment. 

The set consists essentially of a delay unit, a 

variable attenuator and either one or two indicators. 

The delay unit consists of two coils which can be 

used separately for short delay or in series for long delay. 

The signal delay obtained by use of the short coil is 

equivalent to a 65-foot altitude. The long coil gives the 

equivalent of a 297-foot altitude. Whenboth coils are used 

in series a signal delay equivalent to a 350-foot altitude is 

obtained. The known delay periods provide a means for 

checking the calibration of the altimeter systems under test, 

by observing their altitude indications. 

The variable attenuator, calibrated in decibels 

from 30 to 100 and used in conjunction with the delay lines, 

provides a voltage attenuation equivalent to actual signal 

TEST SET TS - 10/APN 

Component 

Delay Unit 

Attenuator and Cord Assy. 

Output Indicators (2) 

Cord (2) CD-800 

Cord CD-800 

Spare Lamps (2) for indicators 

July 1945 

Test Set TS-10/APN 

Nomenclature 

CG-107/APN or CG-108/APN 

CG-107/APN or CG-108/APN 

TS - 1O/APN 

loss and allows a check of overall system sensitivity and 

tuning. The indicator used with Test Set TS-10/APN and 

TS-10A/APN consists of a tuned dipole with a lamp, which 

can be attached to or used in close proximity to the altimeterantenna. 

Indicator ID-98/APN or ID-98A/APNused 

in TS-10B/APN and TS-10C/APN respectively contains a 

1.5 volt battery, variable resistor, lamp and pickup dipole. 

The lamp indicates theapproximate powerbeing fed to the 

antenna. It is used for checking the condition of the antenna 

system. 

POWER SOURCE BA-30 (1.5V) REQUIRED 

FOR ID-98/APN & 

ID-98A/APN 

FREQUENCY 420 - 460 MC 

INPUT IMPEDANCE 50 OHMS 

OVERALL ATTENUATION 60 TO 130 DB (APPROX.) 

DELAY 0.7 MICROSECOND 

(APPROX.) 


Size Weight 

16" x 14" x 7" 

20" long 

10" long 

8' long 

1' long 

Section 4- Graphic Survey

UNCLAiF lED 

Test Set TS-16/APN is a portable equipment designed 

for aligning and calibrating various radio altimeters 

such as Radio Set AN/APN-1, AN/ARN-1 and Altimeter 

Equipment RC-24-B 

This equipment consists essentially of a precision 

audiofrequency oscillator and aprecision UHF frequency 

meter for checking and aligning FM altimeters. 

When the necessary connecting cables are attached, the 

counter circuits of the altimeter can be calibrated, the frequency 

modulating oscillator can be checked and the band 

width of the altimeter transmitter can be set. 

It is self-contained in a wooden case with handle. 

A compartment within the case is provided for storing the 

accessory cordage. The phantom antenna and spare fuses 

are mounted inside the top cover of the test set. 


2903 for 1945. 

POWER INPUT 38 WATTS @ 28 

VOLTS 

FREQUENCY RANGE 410 TO 470 MC 

ACCURACY ERROR NOT TO EX- 

CEED PLUS OR MINUS 

,3 MC 

AUDIO OSCILLATOR RANGE 340 TO 7250 CYCLES 

MODULATOR FREQUENCY .5 CYCLES PLUS 

ACCURACY OR MINUS 

AUDIO ACCURACY 1 % UP TO 5000 CPS. 

2 % 5000 TO 7250 CPS 




1 9002 1 12A6 

2 12SJ7 2 12J5GT 

TEST SET TS-16/APN 


Test Set 

Cord 

Phantom Antenna Unit 

*Weight less than one pound. 

July 1945 

TS-16/APN 

CX-35/APN 

TS-63/AP 

R u, 

Test Set TS-16/APN 

TS-16/APN 

Test Unit With Tee Connector On Cord CX-35/APN 


Size Weight 

16" x 11" x 17" 

8 Feet 

2" x 1" 

40 Lbs. 

2 Lbs. 


UnCL~S3lglEB 

TestSet TS-23/APNanaltimeter test set is used 

for depot testing of certain operational characteristics of 

Radio Set SCR-718-(). 

The set consists essentially of a fixed-tuned wavemeter, 

diode detector and a d-c microammeter. The Transmitter 

frequency is set by tuning for a maximum deflection 

on the meter. Relative power output measurements are 

also indicated on the same meter at a calibrated marking 

of 375 volts. The other calibrated marking of 320 volts is 

for measuring low voltage B+ in Radio Set SCR-718-(). 

The equipment is self-contained in a metal case 

with all operating controls onfront panel. There are four 

accessory operating cables; three are permanently attached 

to the unit and the fourth is detachable. The test set is nor- 

mally mountedwithinawooden carrying case but may be removed 

if desired. 

AAF requirements as of 8 March 1945 were 386 

for the calendar year 1945. 

POWER INPUT 1.5 WATTS @ 115 

VOLTS 

FREQUENCY _440 MC 


NO. TYPE I NO. TYPE 

1 9004 

Cord CD-800 

TEST SET TS-23/APN TOTAL WEIGHT 14 LBS. 

Component 

Test Set 

Cord 

Carrying Case 

Allen Wrench 

July 1945 

Nomenclatur e 

TS-23/APN 

CD-800 

1' LL 

Size 

9" x 4" X 4" 

34" 

12" x 9" x 8" 

TS-2 3 /APN 

Weight 

5 Lbs. 

7 Lbs. 


TestSetTS-111/CPi s an adjustable coaxial cavity 

wavemeter designed to test airborne radar or beacon 

systems. It is used with the AN/CPN-3 and AN/CPN-8. 

This equipment will measure or check the frequency 

of pulsed, CW or modulated radar transmitters or 

signal generators. The wavemeter sensitivity is such as 

to require 2 milliwatts of CW RF power to give. full scale 

deflection df the microammeter. 

The RF attenuator is continuously variable from 

a minumum of zero DB attenuation to a maximum of approximately 

25 DB attenuation. 

A dc mircoammeter is used to indicate resonance, 

and frequency is read from a calibration chart supplied 

Cord CG-114/U 

TEST SET TS-111/CP 

Component 

Wavemeter 

Attenuator 

Cord 

Cord 


JuLy 1945 

Case CY-167/CP 

Nomenclature 

TS-111/CP 

CN-15/CP 

CG-244/AP 

CG-100/U 

CY-167/CP 

Attenuator CN-15/CP 

TS-111/CP 

with the wavemeter. The set is enclosed in a waterproof 

plywood transit case. 

AAF requirements as of 3 March 1945 were 334 

for 1945. 

2It 

FREQUENCY 3000 TO 3600 MC 

TYPE OF SIGNAL PULSE OR CW 




1 IN21B 

'Size 

Wavemeter TS-111/CP 

Cord CG-99/AP 


7" x 5" x 5" 

6" x 3" x 3" 

5 Feet ,- 

5 Feet 

10"xx1 ' 

10" x 

, r e 

Weight 

8 Lbs. 

1 Lb. 

1 Lb. 

1 Lb. 

10 Lbs. 

4 - Graphic Survey

Test Set TS-251/UIP (Loran Test Set) is a portable 

RF signal generator. Various RF channels and output 

voltages are indicated and selected by rotary switches located 

on the front panel. All visual indications appear on 

the receiver indicator. A table of correct readings is 

posted on the signal generator panel for comparison. 

This equipment is designed to measure or check 

time performance (including crystal frequency adjustment), 

stability of sweep generating circuits, receiver alignment, 

possible video distortion and accuracy of time delay measurements 

on Loran Sets AN/APN-4, AN/APN-9, SCR- 

722A, DAS-1, and LIRN. 

U-46/U 

TEST SET TS-251/UP 

Component 

Test Set 

Includes: Cords, plugs, adapter etc. 

July 1945 

TS-251 /UP 

POWER INPUT 23 WATTS @ 100-130 

TYPFOF SGNALPULSED OR CW 



1 6J 5 1 6SN7GT 

1 6SK7 1 6X5/GT 

1 6SJ7 1 6SL7 

C-0/PCG-223/UP CQ- 222/ UP 

U-45/U 

Nomenclature 

T-251/UP 

Size 

p 

10" x 12" x 8" 

4P 

-258 

Navy Type 49544 


Weight 

11 Lbs. 

J 

Section 4 - Gr-aphic Survey

Section 4 - Signalspaning.se

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