AN/GSQ-160
Detecting-Transmitting Set, Electromagnetic

Overview
Key Components

BA-1549U Battery
MX-8846/GSQ-160 Detecting Transmitting Set Sub Assembly

A1 Sensor Oscillator
A2 Supplemental Circuits
A3 2.5 MHz Signal Processor
A4 Secondary Processor
A5 Antenna Coupler
A6 Electrical Chassis
A7 Data Transmitter

TC432 Code Plug
TC431 Encoder
TC-560 Transmitter

AS-2542/GSQ-160 Antenna
Manuals

USQ-46 (USQ-46A) Radio Frequency Monitor Set WANTED TO BUY
TS-2963/USQ-46 Test Set
PP6446A/USQ-46 Power Supply
Battries for USQ-46 & TS-2963
ID-1721 Indicator WANTED TO BUY
PT1561 Code Plug Programmer
PT1586 Stack Tester
GATE ? Automatic Test Equipment

GSQ-154 Alarm Set, Anti Intrusion, Restricted Area - seperate web page
Plant Antenna -  Photo -
TRC3- Photo -
PEWS - Photo of PEWS trasmitter Does this transmit a code that the USQ-46 receiver can understand?
GSS-26 -

Overview (Top Photo)

This is a battery powered set designed to be buried with the antenna and daylight sensor above ground.  It detects changes in it's RF field at 60 & 57.5 MHz and will transmit an alarm around 168 MHz when it detects a change above some threshold.  I think that not only will it detect people (or large animals) at about 120 feet and also vehicles at longer ranges but also any radio transmissions that might impair it's operation.
The date codes are for the early 1970's. Drawing from the Manual

There is a label on the top that says:

OVERHAULED
TOBYHANNA ARMY DEPOT
DATE    MAR 81 The Surveillance Systems Directorate has jurisdiction for sensors.  They are in Pennsylvania.

Key Components

Main Electronics sub-assemblies

The main electronics are contained in the top half of the case.  The lower half holds the battery.

BA-1549U Battery - Battery Box CY 7046/GSQ-160

The battery box is just the lower half of the GSQ-160 case.
Has the following outputs:

• + 4 Volts
• - 4 Volts
• + 30 Volts

Since the batteries are hard to come by and the connector is not one I know, I plan to use some of the unused pins on the GATE DB25m connector for power.  Both the GATE connector and Plug 1 are on the A6 motherboard.
Pin 12 will be -4 VDC - to A6 Green wire
Pin 13 will be +4 VDC - to A6 Blue wire
Pin 25 will be +30 VDC - to A6 Orange wire

MX-8846/GSQ-160 Detecting Transmitting Set Sub Assembly

The top half case has a 6 pin male plug that goes into the battery.  There is a center pin with a flat and 6 samller pins.  Two of the smaller pins are ground contacts, but I have yet to determine which pin is what voltage. Drawing showing batt connector, tamper switch, GATE DB-25m. (You need the Free Volo or WHIP! Viewer from Autodesk).  Bottom View Photo and Photo With Chassis removed.

A1 Sensor Oscillator

This board contains two oscillators, one at 60 MHz and another at 57.5 MHz.  They drive the antenna with about 1 milliwatt of power.  These signals provide the EM field that detects changes in impedance.
This is NOT a siesmic or magnetic detector, but rather an Electromagnetic filed based detector.

There is also a mixer that combines the transmitted and received signals to produce a 2.5 MHz output.

A2 Supplemental Circuits

There are fucctions for:

• daylight detection - either 24 hrs per day or night only operation
• tilt detection - destroy some electronics if unit is tilted or mechanically shocked while armed
• low battery detection - destroy some electronics if battery goes low
• battery case tamper switch - destroy some electronics if if battery case is opened
• Recovery Code switches - destroy some electronics if if wrong recovery code is set and unit is turned off
• + and - 2.8 VDC voltage regulator from + and - 4 V switched batt
• Disable pulse generator (3.5 Volts @ 30,000 Ergs) - to destroy A7 electronics

A3 2.5 MHz Signal Processor

This analog circuit does some primary signal processing on the 2.5 MHz signal.

A4 Secondary Processor

Does log, filtering and anti-log operations and generates the alarm pulse.
A mute pulse also generated that is used to shut down the 57.5 & 60 MHz transmitter as well as stop signal processing during an alarm.

A5 Antenna Coupler

This is really a diplexer that allows the 60 & 57.5 MHz sensing RF go to the antenna and also allows the 162 - 174 MHz alarm transmission to also go to the antenna.  A5 is part of the Plate with 3 screws (Photo)
Note "G-7 Recovery code stenciled on bottom.

A6 Electrical Chassis

Contains the Off - Test - Arm switch, the daylight sensor, the two recovery code switches and a motherboard for the other modules to connect to each other.

To remove chassis from top half:

• Remove coax connector "J1" that has a "wheel" attached with your fingers.
• Remove 4 slotted head screws in the bottom of compartment
• Remove 3 each #2Philips screws from top of compartment.
• Seperate chassis from Lid but be carfull since they are still connected by man wires
• Confirm Recovery code by continuity test between Red and Brown wires going to Recovery Switches.  Only when the correct code is set (G7 in this case) will there be continuity.  In this case the white jumper wire goes from position 8 to position 8.  If the switches are labeled as:
• Set  A  B  C  D  E   F  G  H   I    J     K     ....and.....
• Set  1   2   3   4   5   6   7   8   9   10   11
you can see that 8-8 corresponds to G-7.
• CUT THE RED WIRE - in case you have a unit where the destruct pulse has not done it's damage, prevent damage from happening!

There is also a DB-25m connector (A6J5) that is for use with the GATE test equipment. In the Photo you can see the tamper switch on the left, the cylindrical tilt switch "A5" and A6J5 connector.

• 1  -2.8 VDC supply though 1 K Ohm
• 3  +2.8 VDC supply though 1 K Ohm
• 5  + 4.0 VDC  supply though 1 K Ohm
• 7 Average Input Frequency
• 9 Alarm Inhibit
• 11 +30 VDC supply though 1 K Ohm
• 14  -4.0 VDC  supply though 1 K Ohm
• 16, 19, 21 & 23 Common
• 18 Primary Output
• 20 Alarm Monitor
• 22 Detection Alarm Threshold
• 24 Log Compresson Output

The Battery Connector has 6 male pins.  The longer bigger center pin has a flat.
When looking at this connector with the flat down:

• the pin directly above the center pin (12:00) is ground
• the pin at 2:30 is +4
• the pin at 5:00 is +30
• the pin at 7:00 is ground
• the pin at 9:30 is -4

A7 Data Transmitter (Photo 3 parts)

This consists of three parts.  These parts are not covered in the manuals for the AN/GSQ-160 and are used in other military equipment.  These parts all are cylindrres 2.75" in diameter and all have a common connector that is a ring with 92 pins and 4 coaxial connectors that are 90 degrees apart labeled A, B, C and D (not part of the pin numbering system).  There are 4 versions of this connector here:

• TA383 both male and female pins and the moduleis  just under an inch long
• TA385 has only male pins like on the transmitter Male End
• TA386 has Female pins and wires going to the GSQ-160 or other equipment

I think that this connector system was developed by Sandia.  In the case of the TA385 combined male and female connector that all the pins go straight through (I will check this).  If that's true then maybe you can install these 1" high modules in any order.  They would take their power form known pins and send their outputs to pins that were only used for that purpose.  More on this after some Ohm meter work. Table showing 92-pin wiring for the 3 cylinders.

25 Sep 2002 - I now think this is the same modular system used to build sonobuoys.  The frequency range of the transmitter matches the assignments for sonobuoys.

TC432 Code Plug

Male end, Female end
End Label: TC432
SM-D-171730
34372, ODE PLUG
NOMEN KY-677 /GSQ
DAAB07-71-C-0048
S/N 01492
MAR 71

with hand written Label  231 14 00 34 on the diameter of the cylinder

This module connects to GSQ-160 mother board using the TA386 connector with 5 wires:

• Brown - Common Ground - TA386-47
• Red - Destruct Pulse - TA386-52
• Orange - +30 VDC switched power to cylinders - TS386-3
• Yellow - +6.3 VDC from cylinders - TA386-71
• Green - Alarm Call Up - TA386-36


This 0.95" tall module contains diode-resistor logic that can be programmed by fusing resistors.  Each bit of data is determined by at least two resistors.  If when reading the code either both resistors are there or both not there you know that the code is invalid.
 

There are 63 each 200 Ohm resistors in the module and the time to burn a module is 63 seconds.  Maybe they allow 1 second for each resistor.

The type of data burned into the code plug is:

• RF Channel Number - 3 digits on the label, i.e. 231 in this case (but how does this correlate with the crystal # 442 and the Chan # 442 on the ID tag?)
• ID # - 14 in this case - the number that shows up on the USQ-46 or compatible receiver
• Audio Function - 00 and not applicable to this configuration
• Time & Gain - 34 in this case & also not applicable to this configuration
Details are available in the PT1561 Tech manual T.O. 31S9-4-18-1.

This is the module that customizes each equipment that uses the TXxxx cylindrical devices. They are custom burned for each serial number equipment and have individual ID labels.

The schematic appearing in Figure 6-7 T.O 31S9-4-18-1 does not show any connection with the Disable Pin #52.

TC431 Encoder

Male End, Female End
It does not have a printed label like the others.  It is potted.

The Encoder reads the "Code Plug" data, checks it for validity and outputs a serial data stream that's either 18 or 24 bits long and at either 75 or 300 bits per second. The later two choices are determined by some of the bits in the "Code Plug".  Zero volts is a space and 5.5 to 6.3 VDC is a mark.

Functions include:

• generating +6.3 VDC @ 16 ma max. for the other circuits from the +30 supply when there is an alarm condition.
• generating the serial data stream by reading the TC432 code plug. The levels are 0 to 1 Volt for space and 5 to 6 V for mark, but it's called "split phase" which means it's A.C. coupled to remove the DC component.  This makes sense if it is used to drive a varactor diode that's across the crystal terminals in the transmitter.
• 5.5 VDC voltage regulator for it's own IC power
• It must also switch the +30 VDC on pin 3 of the 92 pin connector and connect it to pin 26 of the 92 pin cnnector to power the transmitter.  This might be a relay or solid state switch.  This is the only way that the transmitter module could get enough DC power to output 4 Watts of RF.  The transmitter draws 430 ma max (13 Watts DC input max).  The other + and - 4 V supplies are not connected to the cylilders and the 6.3 VDC supply has a very low current capability.

TC-560 Transmitter

Male End, Female End
End Label: TRANSMITTER
RADIO TC-560
T-1233(V)/GSQ
91417:614396
DAAB07-72-C-0156
S/N   A03778
CHAN 442
01/73

The contract number is different and the data codes are a couple of years different from the TC432 above.  This is another indication that these cylindrical parts were (are?) used on a number of equipments.  If the label and rubber gasket are removed the crystal can be seen to have a label of "442" indicating the channel number that matches this label as well as the tag attached to the outside of the GSQ-160.

This is the "T3" transmitter.  There also are the  "T1" (TC434) and T2 (TC516) available for use with the GSQ-160.

The frequency range is 162 to 174 MHz and the channel spacing is 18.75 KHz.  The nominal output power is 4 watts.

To Open T3 DO NOT REMOVE ANY OF THE SCREWS!  The Aluminum sleeve is held on by two o-rings.  Just hold the green connector and turn the sleeve while pulling slightly away from the connector.

The following connector pins are used:

• 17 - black wire - Common Ground for input Printed Circuit Board
• B Coax - no connection in T3, just passes to the off center coax Conn. on Female End (test?)
• 26 - Orange to input PCB and series diode = +?? VDC power input
• 32 - White to input PCB right next to one of the crystal pins = serial data modulation. (0=space, +5.5 to 6.3 = mark).
• 47 - Black = Common Ground for output printed circuit
• 52 - Green - Disable wire to  output PCB
• 
  
The Orange and white wires must be serial data in and DC power.  The Orange wire is connected to what looks like a 1N400x diode wired as if the orange wire was carrying a positive voltage. So I will say that Pin 26 is + ?? VDC power for the transmitter and Pin 32 is the serial data our of the TC431 Encoder.

The Disable pin A6P1 #52 is connected to a 0.15" diameter by 0.55" long white cylinder that has two wires coming out of each end.  The green wire from Disable pin 52 goes to this component.  It is marked:

    "ATLAS MMS
    1.0-0-A
    6.0 +/- ????

and a small schematic diagram that indicates that the two leads on the green wire end go to a "resistor" with a dotted arrow to the other end where there is a normally closed (or normally open) switch.  On my unit the switch seems to be open.  Maybe this unit isOK or maybe it has been destroyed..

The two circuit boards of the T3 transmitter are screwed onto a steel plate with #1 Phillips screws and 1/4" across the flats nuts.  The steel plate has two steel cylindrical end caps that hold the o-rings for the sleeve.  All this steel is made from what appears to be a casting.   It would be possible to place some explosive between the two printed circuit boards and destroy the boards, but I don't think that was done in this case.  There are a number of wires soldered between the two boards so it would be difficult to remove them to inspect the back sides.

The Female end has two Mini 75 OHm SMB Plugs.  The center one is the transmitter output.
The off center one is not connected to anything inside the transmitter.  It just connects to the "B" coax in the 92 pin connector.  The purpose of this second coax line is for those systems that also have a receiver.  A T/R Diode Switch TC530 (or TC620 for missiles) is connected between the stack end and the antenna.

A Pasternack Ent. PE9619 Mini 75 Ohm SMB Jack to 75 Ohm BNC Female Adapter could be used for testing.  The BNC side will mate to standard 50 Ohm BNC cables. Unfortunately they have a $100 per order min and $10 per line min.

AS-2542/GSQ-160 Antenna  WANTED TO BUY

I would like to get one of these.  It's a dual mode antenna with a type-N(m) connector at the base.  The A5 Antenna Coupler drives either the outer conductor or the center conductor of the type-N(f) connector depending on the frequency and the antenna works in different modes for 57.5/60 MHz and for 168 MHz.  It is designed with a slight bend so as to look like a plant.

The top section is 32" and the bottom 14" for a total length of 46".

Manuals

Army TM 11-5840-352-14
Air Force TO 31S9-2GSQ-160-1
Electromagnetic Detecting-Transmitting Set AN/GSQ-160
and
Simulator Group OA-29/GSQ-160
(FSN 5840-168-7719)
March 1972
017470.pdf
Operating Instructions and direct support. Includes detailed functional description.

TM 11-5840-352-24P
Detecting-Transmitting Set, Electromagnetic AN/GSQ-160
(NSN 5840-00-168-7719)
and
Simulator Group OH-29/GSQ-160
(NSN 6625-00-482-6150)
Current as of 1 February 1978
034516.pdf
Repair Parts designations and lists.

Related Equipment

R1617/USQ-46 (USQ-46A) Radio Frequency Monitor Set WANTED TO BUY

TS-2963/USQ-46 Test Set

PP6446A/USQ-46 Power Supply

ID-1721 Indicator WANTED TO BUY

PT1561 Code Plug Programmer

T.O. 31S9-4-18-1
TM 11-6625-2514-14-2
Code Plug Programmer Test Set
Model PT1561
Part No. 336467-000
F41608-71-C-0948
This copy is a reprint tht includes current changes 1 through 3.
15 February 1971
Change 1 10 April 1973
Air Force 7-8-73 - 250 Reprint
016407.pdf

PT1586 Stack Tester

AF T.O. 31S9-4-20-1
System/Stack Tester
Model PT1586
Part No. 286823-000
F41608-71-C-0948
F41608-71-D-0973
This copy is a reprint tht includes current changes 1 through 5.
15 February 1971
TM 11-6625-2514-14-1
The PT1585 is a tester for use with a stack of the 2.75" diameter components.
The MA31, MA33, MA37, MA124, MA133 (AUDET), MA134 (EDET), MA135 (AUDET), MA136(EDET), MA137(Sesmic), MA138(Seismic AUDET) , MA139(Seismic EDIT) sensors and MA56, MA87, MA88 EXRAY's or completly assembled sensors or EXRAY's can be tested.  This includes the CADET family of sensors. Some of the sensors are:

• TC431 Encoder
• TC533DW - Timing and Destruct
• TC434 Transmitter
• TC517 Receiver
• TC534 Decoder
• TC447 short life battery
• TC438 battery
• TC516 Transmitter
• TC530 Diode Switch
• TC596 Receiver
• TC614 crimping tool
• TC619 Hi-rise Timing and Destruct
• TC620 Hi-rise Diode Switch
• TC662 - engine detector module
• TC665 assembly trough
• TC659, TC660 or TC668 - enable/disable module

Hi-rise refers to a rocket powered stack.

MA31 is a Command Link (CL) sensor containing 9 modules
consists of: TC437, TC431, TC432, TC430, TC436, TC433, TC434, TC460

MA125, MA135, MA137 and MA133 are ground CL sensors with 10 modules
MA124 and MA133 are CL hangup sensors with 8 modules
MA33 and MA37 are Non-CL sensors with 5 modules:: TC431, TC432, TC434 (less TC437)
MA134 (5 modules), MA136 (7 modules) and MA139 (7 modules) are NCL sensors
MA56, MA87 and MA88 EXRAY's are expendable relay sensors with 6 modules

The L module may be the TC432 Code Plug
The T module is the Transmitter
The E module is the TC431 Encoder
order of remaining modules: E L Z J S R T V wires from the V module.

GATE ? Automatic Test Equipment

This was a Generic (?) Automatic Test Equipment system based on the HP 2116 computer (core memory), paper tape reader and a lot of equal vintage HP test equipment.  In this way you could automatically measure common parameters like voltage, resistance, frequency, power, etc. using common test equipment and an adapter that connected the device under test with the test equipment.

Other Manuals

All of the above  Technical Manuals are available on line at LOGSA.

TM 11-5985-385-14&P
Title?
065241.pdf -classified

TM 11-5821-356-23
Title?
074680.pdf -classified

Plant Antenna

Rubber coated with "branches" that are not an active part of antenna. Plant Atn. Photo

Links

DT-561(A)/GSQ  hand-emplaced, magnetic detecting sensor.
DT-562(A)/GSQ. This is a hand-emplaced, SA classifying sensor. It detects targets and classifies them as unknown, wheeled vehicle, tracked vehicle, or personnel.
DT-565(A)/GSQ. This is a hand-emplaced, passive IR detecting sensor
Radio Repeater, RT-1175(A)/GSQ
Monitor/Programmer, AN/PSQ-7
Advanced Monitoring Display System . (AMDS)
Batteries. The sensors, repeaters, and M/P use either BA-5557/U lithium or AA alkaline or nicad
 The REMBASS set uses the AN/GSQ-187 to relay data.

                              TRAINING EQUIPMENT

RO-376A-USQ        Signal Data Recorder
AN/USQ-46A         Portable Monitor
AN/GSQ-159         Disposable Seismic Intrusion Detector
AN/GSQ-154A        Miniaturized Seismic Intrusion Detector
  DT-383/GSQ         Audio Add-on Unit
  AN/GSQ-171         Directional Infrared Intrusion Detector
  AN/GSQ-176(S)      Air Delivered Seismic Intrusion Detector (Short)
  AN/GSQ-176(N)      Air Delivered Seismic Intrusion Detector (Normal)
  AN/USQ-66(V)       Battlefield Area Surveillance System
  TS-2963/USQ-46     Emission Generator
  AN/GRQ-21          Expendable Relay
  AN/GRQ-26          Receiver-Transmitter
  AN/GXQ-257     Unattended Ground Sensor Set
  AN/MSC-77          Sensor Mobile Monitoring System
  M1097              High Mobility Multipurpose Wheeled Vehicle
  AN/USQ-126     Sensor Monitoring System
  RO-630/USQ         Signal Data Recorder
                     SMS Antenna Group
                     SDR Remote Kit
                     Communications Group
  RE-1162/U          Relay Assembly
                     Relay Unit
                     UHF Assembly
                     Battery Box
                     Relay Assembly Antenna Support Kit
  AN/USQ-121     Portable Monitor
                 Test Set, TRSS

GSS-26(A) Alarm Set, Anti-Intrusion Restricted Area - After opening this hermetically sealed can I found no sensors.  There are 3 double sided printed circuit boards, 1975 date codes, high Q analog caps and inductors and what may be IC type op-amps.  I would say this is some type of analog processing circuit, maybe an "Audio" based alarm.  There are 3 connectors, maybe Power, Microphone input and Connection to rest of alarm system?

TM 11-6350-200-10 is on the ETM page, but is restricted.

Mike Murphy Surplus - my source for much of the above
Fair Radio Sales - also had some printed manuals that were not on LOGSA  for info on using LOGSA see my manuals page

Brooke's Home Page
mailto:brooke@pacific.net
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