Radio Receiving Sets AN/TRQ-23 & AN/TRQ-30
Antenna Group OE-4/GR
AS-2360 Series Loop Antennas

Frequency Coverage, Antennas & Receivers

The current version of this system may be

• AN/TRQ-30 uses: R-1218/UR for HF and R1518/UR, AS-1523 and AS-1524, PNH-7 see: TM TM-32-5895-206-10
  
• AN/TRQ-32A(V)2 TEAMMATE  @FAS - Equipment List - AN/PRD-12 List (TM 32-5825-001-10-HR) -
  Uses The PRD-12, AS-4144/PRD-12 HF antenna (stock # 5985-01-304-2940), Display Unit ID-2465/PRD-12 (NSN 7025-01-304-2986)
  
• AN/TRQ-37, TACFIX @FAS -

Equipment Descriptions

TG-177/GR Portable Antenna Drive - Tripod mount WANTED TO BUY

In this drawing you can see:

• Portable Antenna Drive TG-177/GR
• Tripod (Legs Electrical Equipment) MX-6334/GR
• Compass J23

15 RPM nominal (clutch energized) 24 VDC @ 300 mA
150 RPM (clutch de-energized)
18 - 32 VDC
Rotation by means of a 24 VDC motor with a 24 VDC clutch.
Resolver reads back antenna position.                                                                                                                                                      

TG-176/GR     Fixed Antenna Drive - Shelter mount WANTED TO BUY

Rotates at 60 PRM (1 rev per second).
24 VDC @ 375 mA. to azimuth DC motor (pin L and ground pin x)
Resolver (R1: pin: U; S1: pin S, R2: pin V=pin W=R3; R4: pin T)

IP740/GR  Azimuth Indicator - CRT based Front & Back

Since the continuous rotation speed can be up to 150 RPM a CRT type indicator will have a much longer life than a mechanical indicator.  The antenna pattern can be seen on the screen and the null direction read out to within 2 degrees.

There has been a modification that disconnects the active wire from Diode Input connector on the Front panel and adds a BNC(f) connector to the rear panel, a pot on the rear panel, Red & Black wires coming out the rear panel and a Sense push button on the front panel (maybe to replace a momentary rotary switch?).

On the Front and Rear panel there are a 4 pin Power Input connector (ITT Canon 1S13114E8-4P)
and also a pair of Control Unit connectors (Burndy 14-12P) with 8 small pins and 4 large pins.

The name plate says:
Indicator, Azimuth
IP-740/GR
Serial No. 47
Servo Corporation of America
PII No. DAAB05-67-C-2337
U.S.

Battery to Indicator Cable Assembly, CX-11950/U (5'0") must have an ITT Canon 1S13114E8-4S connector.

C-6183/GR Antenna control

Band Switch

There is a band switch with "sync" and band numbers 1 through 8 (see below table).  The antennas all have provision for 8 band positions, but only some are used in any single antenna.  The AS-2360 supports band numbers 1 through 5.  The bands are changed by means of a 12 position rotary solenoid in the antenna assembly.  In position 6 the coil of antenna sense relay (K1) is connected to the "Sense" line pulling the line up to +36 volts (B+) allowing the control unit to synchronize (SYNC) thus learning that the solenoid is on step # 6.  I expect that when the antenna control band switch is placed in "SYNC" the solenoid rotates until position 6 where it stops.  The solenoid only rotates in one direction 30 degrees per step.

Band	Low MHz	Hi MHz
1	0.53	1.15
2	1.10	2.35
3	2.25	4.80
4	4.60	9.90
5	9.50	20.5
6	19.5	33.0
7	31.0	56.0
8	55.0	101

Photos

The Mystery Circuit (Fig 8 and Fig 9 below).  Battery Boxes.
This is the internal battery consisting of four each BA-408, 6V batteries with Octal sockets.
The four tube bases are labeled BT1 through BT4.
SM-D-64 33 95 - my be the drawing for this assembly.
The 4 devices are wired in series.
? - Orange - BT2 - Black - BT1 - White - BT3 - Orange - BT4 - Black - J5

BA-408 might be 2.5" x 2.5" on the face with the Octal socket and stand 3.5" tall.
That space probably would hold 4 each "D" cells.

Internal batteries are only needed if the IP-740 is not part of the equipment setup.

Fig 1 Front	Fig 2 Labels	Fig 3 Back
Fig 4 Inside Back Cover	Fig 5 Inside Back of Chassis	Fig 6 Left & Top Inside
Fig 7 Right & Bottom Inside The Rear connector bracket is bent.	Fig 8 Mystery Circuit= battery boxes for BA-408: 6V	Fig 9 Other side of Mystery Circuit
Fig 10 Front & Back mated w/o cover. Internal lid opened.

The antenna can be rotated continuously at speeds ranging from 15 RPM to 150 RPM (depending on which mount is used) or can be manually turned CW or CCW.

The Front panel has connectors for the Indicator (Bendix PT02E-14-12S) and Pedestal (Bendix PT02E-20-24S) .

Indicator (Front Panel)
Bendix 14-12;  8 small & 4 larger sockets

Pedestal (Front Panel)
Bendix 20-24;  24 small sockets

The Rear panel has connectors for Power In (ITT Canon 1S13114E8-4S) and Pedestal (ITT Canon MS3114E14-19S).
Why is the rear Pedestal connector different than the Front panel Pedestal connector?

Power In (Rear Panel)
Bendix;  4 small sockets

Pedestal (Rear Panel)
MS3114E14-19S2; 19 small sockets

The name plate says:
Control, Antenna
C-6183/GR
Serial No.  106 A
Servo Corporation of America
PII No.  DAAB07-77-C-3294
U.S.

Control to Indicator Cable Assembly, CX-11952/U (5'0") looks like a 12 wire with male pins on one end and female pins on the other end.  Both connector shells are MS3114E14 type.

Battery to Control Cable must have an ITT Canon 1S13114E8-4P connector.

Control to Drive Cable  Assembly CX-11953/U (100'0") WANTED TO BUY

AS-2360 Loop Antenna - Photo

Description from Fair Radio eBay auction:

AS-2360 Loop Antenna .53 Mhz to 10 Mhz, usable to 20.5 Mhz.
Impedance 50 ohms
Null depth 25 db, bearing error less than 2 degrees.
Originally part of TRQ-23 radio receiving set.
The base of the loop contains a loop cathode follower with Varactor diode for tuning, two RF amplifiers, and an output cathode follower using 4/6612 tubes which require 36 v B+, 1.1v filament.
Tuning voltage 0-102 vdc, gain voltage 0-37 vdc, sense relay 24 vdc.
Comes with canvas bag, sense antenna (not pictured), connector for antenna, schematic.
Not tested, used good physical condition. AS IS.
Approx size 6.4 x 26.2 x 61.8 (with sense antenna )

From the Fair Radio - 2020 October Sale web page: "Loop Antenna .53 Mhz to 10 Mhz useable to 20.5 Mhz. Impedance 50 ohms Null depth 25 db bearing error less than 2 degrees. Originally part of TRQ-23 radio receiving set. The base of the loop contains a loop cathode follower with varactor diode for tuning two rf amplifiers and an output cathode follower using 4/6612 tubes which require 36 v B+ 1.1v filament. Tuning voltage 0-102 vdc gain voltage 0-37 vdc sense relay 24 vdc. Comes with canvas bag. 6.4×26.2×61.8 30 lbs sh. Used"

It has 6 separate loop windings that can be connected by relays to operate in band numbers 1 through 5.  It also has a Varactor diode to allow resonating the antenna.  The R-901/GR and R-902/GR receivers output the diode tuning voltage which is passed through the antenna indicator unit then the control unit and finally to the antenna.  Schematic.dwf (get the Autodesk free Volo viewer to see this) and the corresponding parts list.

Connections to the AS-2360 (and probably all the other loops are the same)

Pin #	Name	Description
1	Relay Ground	? return for pin 5, big current pulses?
2	Loop Gain	control voltage to 6612 RF amp screen grids
3	Sense	control voltage activates sense ant & for Sync
4	Filament 1.5 DC volts	to drive 4 6612 tubes in parallel  WHAT IS THE VOLTAGE? 1.5 VDC
5	Band switch	Bipolar pulses to change bands
6	Ground
7	+36	B+ for 6612 tubes
8, 9	N.C.
10	Diode Tuning	0 to +? VDC range for VA-521A varactor diode?
A1	RF	output coaxial connector (DC blocked)

Photo of rotary solenoid, 4 deck switch and resistor board
The 30 deg/step rotary solenoid was made by Ledex - p/n  128558-001 date code 7913.
From their records the drive voltage is 28 VDC and a 50 millisecond pulse would be long enough to latch.
Remember that the B+ voltage is 36 (see pin # 7 above).
The 12 position, 4 deck rotary switch was made by Grayhill.

The connector on the base of the AS-2360 (inside the lower tube) is a special DB15(m).
It has a coax connector in the center that has a male shield and a female center contact.
It may be a Cannon Combo D but I have not figured out their part numbering system.
Mouser carries a D-Sub Mixed Contact Connector and the 152-FM11W1S  housing looks correct.
Page 165  shows these connectors.  It's not clear which of 152-FMX1067, 3067, 0003P or 0003S is the correct coax insert.

AS-2364 Loop Antenna - Photo

Label:    Antenna, AS-2364/GR, Serial No. 61 A, Servo Corporation of America, PII No. DAAB07-77-C-3294, U.S.

Antenna Group OE-4/GR -

In the above cover drawing for TM 11-5985-360-10 you can see:

• 2 receivers on the left
• antenna control unit C-6183/GR
• IP740/GR Azimuth Indicator on top of the control unit
• TG-177/GR Portable Antenna Drive
• J23 Magnetic Compass
• some cables

R-901 Receiver

TRQ-30

The R-1218 and R-1518 are both part of the TRQ-30 Radio Receiving Set, see: TM-32-5895-206-10.pdf.
The Radio Receiving Sets AN/TRQ30(V1), AN/TRQ-30(V2), and AN/TRQ1-30(V4) are backpack transportable radio direction finding (DF) and communications intercept units. The three sets have different capabilities (refer to tables 1-1, 1-2, and 1-3). Each set is capable of receiving radio signals in a particular range, recording received keyed or audio range signals, and finding the azimuth of received signals. Each set is intended for independent single operator field operation and operator transport between operating points.

Key elements of the TRQ-30 are: Packboard, R-1218/UR HF receiver, BA-522/PNH-7 Battery assy, R-1518/UR VHF receiver and AN/PNH-7 (cassette tape) sound recorder/reproducer.

The UNH-16A Cassette Recorder-Reporducer is a newer version. (TM 32-5835-001-10.pdf) It uses the M-104/PNH-4 (modified) microphone.

The antennas are described in TM_11-5985-352-14.pdf Antenna Group, Part of Direction Finder Set, AN/TRQ-30(V)1, 2 and 4, July 1977.
The AB-1110 consists of a tripod, two mast assemblies, 4 support Nylon cords and an aircraft standby magnetic compass.  The implication is that the tripod and masts are non magnetic.  Note there is no antenna rotator motor, it's an Armstrong system.  The height of the loop on the two masts + tripod is low enough that the controls at the base of the loop can be manually operated.

Name	Dia. in.	Band 1 MHz	Band 2 MHz	Band 3 MHz	Band 4 MHz	Band 5 MHz
AS-1523*	12-3/16	0.515 - 1.2	1.03 - 2.6	2.03 - 5.3	3.83 - 9.4	8.46 - 21
AS-1526	8-11/16	19 - 50
AS-1527	5-3/16	45 - 100
AS-1528	3-3/4	95 - 157.5

Note *: The AS-1523 has a band switch on the box at it's base. It's not a remote control system.

2023Oct06: So far I have not seen how the "diode" output from the radio is used in this manual system.  Maybe there was a plan to add a motorized drive to the antenna system?

URR-69, URR-70 & URR-71 Receiver Systems

These are HF & VHF intercept receivers that are typically carried on a back pack.  They can operate from a dozen "D" batteries or AC mains.
While these receivers have a "diode" output, it's for use with some unspecified "external equipment".
The antenna specified under the URR-nn nomenclature is either not included or a tape whip, which is all that's needed for interception, and optionally recording, transmissions.  But when integrated into the TRQ-30 signal intercept system a directional antenna is added.  But so far these antennas are manually positioned, not using servo motors.

Name	Rx	Ant	MHz	TM	YouTube
URR-69	R-1444	n.i.	0.5 - 30 Synth, no bands	TM_11-5820-771-14.pdf	Overview
URR-70	R-1218	AS-2887 Tape Whip	0.536 - 20.5 5 bands	TM 11-5820-641-14.pdf
URR-71	R-1518	AS-2887 Tape Whip	19 - 157.5 2 bands	TM_11-5820-770-14.pdf	3ea. R-1518

R-1518/URR-71 Receiver

Description

I got this receiver because it has a "DIODE" BNCf connector on the front panel and that's an indicator that it will work with the Rotating antennas associated with the TRQ-23.  (Also see Radio Direction Finding for earlier CRT based DF equipment).

Portable receiver, battery (12  ea. "D" cells) or external 110/220 VAC power (50 to 400 Hz), or external 24 VDC power;
19.0 to 157.5 MHz, AM, FM, CW. 
Uses AS-2887/UR Tape Whip antenna with TNCm connector attached to ANT 1 where "Trim" peaks the response;
CW-1005/UR Field carry bag.  
ANT2 is for a 50 Ohm Antenna.

Accessories

Headphones, like the H-218/GR with 1/4" phone plug.
110 VAC Power Cord: CX-10956 p/o Accessory Kit MK-1517/UR
220 VAC Power Cord: CX-10957 p/o Accessory Kit MK-1517/UR
24 VDC Power Cord: CX-???

Power Connector

CX-10956/U (10 Ft, 0 In.) 5995-00-029-4158 Mfr 19976   09/83 Line Hot: C-H Line Neutral: L Gnd: F Jumper: A-B-K The 12 Socket connector is the U-290/U like used on the CX-4722 Antenna Control Cable for the MX-6707.

Power J2	Function	24 VDC Cable	110 VAC Cable CX-10956/U	220 VAC Cable CX-10957/U	J1 DB15
A	AC in	nc	A - B -K	A - K	14
B	AC in	nc	A - B -K	B - C	7
C	AC in	nc	C- H - Line	B - C	5
D	AGC out	nc	nc	nc	9
E	+24 VDC in	E - K	nc	nc	13
F	Ground	Ground	Ground	Ground	12
H	AC in	nc	C - H	Neutral	6
J	Shield Ground	nc	nc	nc
K	AC in (fuse)	K - E	A - B -K	A - K	15
L	AC in (fuse)	+24	Neutral	Hot	3
M	Audio Out	nc	nc	nc	1
N	Diode Out	nc	nc	nc	8
-	+18 VDC Internal Battery	-	-	-	4
-	Dial Light Sw	-	-	-	10 00
-	+ 18V External Power	-	-	-	11

Photos

Fig 1	Fig 2 Twelve "D" Cells = 18 VDC	Fig 3
Fig 4	Fig 5

R-1518 Manual

TM 11-5820-770-14 Operator's Organizational, Direct Support, and General Support Maintenance Manual, Receiving Set, Radio AN/URR-71, NSN: 5820-00-013-8944,  Aug 1972, Change 2
TM-32-5895-206-10 

TRQ-23 Documents

Manuals

TM 11-5825-242-10 Radio Receiving Set AN/TRQ-23, Dec 1969 (hard copy from Fair Radio)

TM 11-5825-242-24 Organizational, Direct Support, and General Support Maintenance Manual, Radio Receiving Set AN/TRQ-23, (NSN: 5820-00-136-4967), June 1975

TM 11-5825-242-25 Limited Coverage, Organizational, DS, GS and Depot Maintenance Manual, Radio Receiving Set AN/TRQ-23, Dec 1969

Theory of operation, schematics, test voltages and resistances.

Battery Table

Battery	Equipment	Voltage
BA-403/U	Radio Receivers: R-901/GR, R-902/GR, R-744V/PRR	1.30 to 1.50
BA-408/U (4 ea D?)	Antenna Control G-6183/GR	5 to 6
BA-411/U 4 each	Battery Box CY-3589/U	Total string: 20 to 24
BA-415/U	Radio Receiver R-902/GR	72 to 90
BA-418/U	Radio Receivers: R-901/GR, R-902/GR, R-744V/PRR	38 to 45
BA-30/U	Hand Lantern	1.25 to 1.50

Books

Unlikely Warriors: The Army Security Agency's Secret War in Vietnam 1961 - 1978, Lonnie M. Logn & Gary B. Blackburn, 2013, ISBN: 978-1-4759-9058-4 (HC) - Four dozen pages on ARDF (Airborne Radio Direction Finding), A couple dozen pages related to DF, some for PRD-1, PNH-4 reel to reel recorder mentined (Story of 547.pdf) replaced by UNH-16 cassette unit.  The ARD-23 V-Scan system (pg 370) is mentioned on the RU-21D. (EC-47 used ARD-15 & ARD-18)

Review of Conventional Tactical Radio Direction Finding Systems, by W. Read, May 1989, (ADA212747.pdf) - 30 to 1000 MHz.

Bases of Radio Direction Fiinding (USSR - translated), 1977, 515 pgs (ADA051951.pdf)

Apollo Experience Report: the AN/ARD-17 Direction-Finding System (19750010201.pdf), 12 pgs, 1975 - 2.2 - 2.3 GHz & 225 - 300 MHz.

The Most Secret War: Army Signals Intelligence in Vietnam, Gen. Bruce Palmer, 149 pgs, 2003 (The_Most_Secret_War.pdf)- initially PRD-1, AFSAV-37, ARQ-27 DF, RO-278 Radio FInger Printing,  ,Radio Fingerprinting & voice recorder. ARD-23 a spinning spaced loop antenna mounted in a radome under the belly of a U-21 aircraft. Oct 1970. No mention of "TRQ-".

I am looking for more information about the AN/TRQ-23 & OE-4/GR email Brooke

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