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PRC-112 Survival Radio

Fig 1 Suitcase with PRC-112C & KY-913　　　　　




Fig 2 PRC-112C Survival Radio





Fig 3 PRC-112C Battery/interface Connector




Fig 4 KY-913 Radio Interface Connector



Fig 5 KY-913 Programmer








Fig 6 KY-913 Battery/Test Connector





Fig 7 BA-5112/U

Background

The PRC-112() Survival Radio replaces the PRC-90 family of survival radios that are issued to military aircraft crew members.  The problem with the old survival radios was that they were simple beacon transmitters with no ID capability so when one went off accidentally (a common occurrence considering that there are roughly 556,000 121.5 MHz beacons and 429,000 406 MHz beacons) there was not an easy way to tell if the signal was real or not making for a lot of wasted effort.  Satellite monitoring of the old analog survival beacons was shut down on 1 Feb 2009. 

The new 406 MHz survival beacons each have a serial number and other identification information built in.  A rough position can be determined just from the 406 Mhz carrier and the motion of the satellite that's receiving it.  A much better position can be obtained if the beacon transmitter includes a GPS receiver.  As of 2009 there were about three quarters of a million 406 MHz beacons operational.

In the movie "Behind Enemy Lines" this is the radio used by Owen Wilson throughout most of the story.  It even makes static noises after the tank attacks a building in Hoc with the battery removed.

AN/AYD-1 Personnel Locator System (PLS)

PRC-112 Aircrew Member Survival Radio

In Fig 9 above showing the modules inside the PRC-112 you can see a distorted module to the left of the TADIRAN Transponder.  The module at the right top (next to the Transponder) is a 72 MHz TCXO.  The module at the front marked D793 has a coax that leads to the antenna.  The right hand red wire at the very upper right (in the narrow part of the chassis) is connected to the battery socket negative battery terminal.  There's 10 Ohms resistance between the two red wires when the power is on or off..  The metal can with the two red wires may be a filter in the negative DC power line.

Opening (probably the same for all versions)

The cover is held on by what may be Bristol Key Chart head metric 2.2-0.45x9 mm screws. A 0.050" hex wrench will fit into the hole, but when turned tends to strip leaving a round hole.  Kroil penetrating oil is also a helpful thing to have on hand.  Some of the screws may have been epoxied to prevent their removal (maybe also the reason for using Bristol heads).  More when the wrenches arrive.

The L-key wrenches arrived are are the wrong set.  This set marked "Bristol Wrench" & "Spline Key Kit" contains 10 keys and is sold on eBay as "SS-408 - Bristol Spline Wrenches Collins & Bell Howell".  It contains: -060, -069, -072, -076, -096, -111, -133, -145, -168, & -183 spline L-keys.  All of them too large.

The "SS-508 Spline Key Kit"  is the one needed for the PRC-112 cover screws and has 9 L-keys.  Max-Gain Systems sells them on line for ham radio and electronics.

After picking out the epoxy on a few screws and using Kroil for many days there were screws that just would not budge with reasonable force.  Using a 500 Watt soldering iron on the screw head did not help.  What worked was drilling out the screws.

Once the cover is removed to free up the module assembly the four corner screws on the printed circuit board can be removed.   Leave the four screws in the center of the PCB since these hold modules.  The top (closest to the cover) internal PTT screw needs to be removed since it also goes into the module assembly.

PRC-112A(C)

PRC-112B GPS-112 Hook-112

PRC-112B1

PRC-112C

Made by Motorola this is just the basic PRC-112 radio without GPS and without SARSAT data.  It has the improved sensitivityhe and knob upgrades (GD p/n 01-P21261J004).
The June 27, 2003 GD contract adds GPS, 2-way messaging and encryption to the PRC-112C to make a PRC-112B1

Connectors

In Fig 3 above of the battery connector you can see that there are five electrical contacts surrounding the two battery terminals.  Two of these are for the programmer interface.  In Fig 4 above of the top of the KY-913 programmer you can see the two programming pins surrounding the two battery terminals. Note in Fig 6 above  that the KY-913 battery connector has the same five terminal arrangement surrounding it's battery terminals.  This must for testing and flashing the memory of the programmer.  There is an adapte cable made by Aeroflex that interfaces their communications tester to the radio battery connector and has the 5 interface pins in addition to the two battery terminals.

There might be an antenna adapter that can be installed by removing the tape antenna and screwing it onto the radio so that a D&M type satcom antenna can be fitted.

The antenna is held to the radio with what looks like a 5/16-24 bolt.
There appears to be a coax connection possible but it would require a special adapter with 5/16-24 threads and a center conductor.

PRC-112C

Made by Motorola this is just the basic PRC-112 radio without GPS and without SARSAT data.  It has the improved sensitivityhe and knob upgrades (GD p/n 01-P21261J004).
The June 27, 2003 GD contract adds GPS, 2-way messaging and encryption to the PRC-112C to make a PRC-112B1

Connectors

In Fig 3 above of the battery connector you can see that there are five electrical contacts surrounding the two battery terminals.  Two of these are for the programmer interface.  In Fig 4 above of the top of the KY-913 programmer you can see the two programming pins surrounding the two battery terminals. Note in Fig 6 above  that the KY-913 battery connector has the same five terminal arrangement surrounding it's battery terminals.  This must for testing and flashing the memory of the programmer.  There is an adapte cable made by Aeroflex that interfaces their communications tester to the radio battery connector and has the 5 interface pins in addition to the two battery terminals.

There might be an antenna adapter that can be installed by removing the tape antenna and screwing it onto the radio so that a D&M type satcom antenna can be fitted.

The antenna is held to the radio with what looks like a 5/16-24 bolt.
There appears to be a coax connection possible but it would require a special adapter with 5/16-24 threads and a center conductor.



Made by General Dynamics and includes GPS, UHF satcom digital 2-way messenging & encryption.  Uses Software Defined Radio (SDR) technology.
Works with the Quickdraw 2  interrogator, Rockwell RSC-125G, Cubic ARS-6 Ver12.
Optional SARSAT digital mode on 406.028 MHz
Has LCD screen and a number of buttons to interface with the screen.

June 16, 1993 Motorola, Inc., GEG, Scotsdale, Ariz., $8.3 million new work modification to a firm fixed-price contract for the production of a basic quantity of 611 AN/PRC-112 Survival Radio Sets, an option quantity of 1,1583 AN/PRC-112 Survival Radio Sets and an associated data item. These radio sets are necessary to achieve first-pass rescue capability for downed crewman, minimizing the loss of survivors to the elements or the enemy. Maybe the kit shown at the top of this page.

APRIL 20, 2000 AN/PRC-112C SURVIVAL RADIO SETS SOL DAAB07-00-R-B035 DUE 051200 POC Cindy Cook, Contract Specialist (732)532-5415, Vernay Salas, Contracting Officer (732)532-1257 WEB: CECOM Acquisition Center's Business Opportunties page, http://acbop.monmouth.army.mil. E-MAIL: salasv@mail1.monmouth.army.mil, cookc@mail1.monmouth.army.mil. This acquisition is being issued as A Sole Source to Motorola, Scottsdale, AZ. This is to acquire 635 each AN/PRC-112C Survival Radio Sets.

Sep 28, 2001 Motorola sells it's Integrated Information Systems division to GD.

June 27, 2003 General Dynamics Decision Systems, Inc., Scottsdale, Ariz., is being awarded a $6,354,315 firm-fixed-price contract to provide for assembly applique added to the AN/PRC-112 or AN/PRC-112C radio to make an AN/PRC-112B1 (Global Positioning System (GPS) capability) radio. This applique adds GPS, 2-way messaging and encryption to an AN/PRC-112 Multi-Mission Transceiver. Price includes installation on 1,167 customer-furnished AN/PRC-112s at $5,445 per kit. Total funds have been obligated. This work will be complete September 2003. The 16th Special Operations Wing, Hurlburt Field, Fla., is the contracting activity (08620-03-F-0154).

Dec. 5, 2000 Motorola (NYSE:MOT) Tuesday introduced its Combat Search and Rescue (CSAR), GPS-112 Personnel Location System. This technology will combine beacon, radio, transponder, GPS and two-way messaging capabilities into a hand-held radio and interrogator system Motorola's GPS-112 transceiver sends encrypted global positioning data and two-way messages to provide essential, quick and accurate location and rescue information to aid in finding the grounded soldiers' location. Motorola's Quickdraw Interrogator can quickly plug into the intercom system of virtually any aircraft, transforming it into a CSAR platform. The information is communicated in a single, short burst to the GPS-112 hand-held radio. This technology provides rescue crews with a very accurate, Low Probability of Interception/Low Probability of Detection (LPI/LPD) system enabling them to locate missing crewmember(s). "The GPS-112 Personnel Location System combines the field-proven benefits of the Motorola CSAR radio with the convenient hand-held Quickdraw Interrogator to provide our customers with a high level of accuracy," said Gary Johnson director of radio products business unit of the Motorola Information Security Systems and Products Division. "Military and government personnel, around the world will have a new, powerful, secure option with Motorola's Personnel Location System."

Combat Survivor Evader Locator (CSEL) PRQ-7

The CSEL has replaced the PRC-112.

The Combat Survivor Evader Locator (CSEL) (FAS: CSEL, Boeing, Thales, )  integrates the GPS into the radio and supports the digital SARSAT data

March 5, 1996  The Air Force has awarded Rockwell a $13 million contract for a worldwide communications system that would be used to search for downed pilots in combat environments, the company said yesterday. The Combat Survivor Evader Locator (CSEL) is a lightweight, low-power, over-the-horizon radio using an integrated Global Positioning System receiver. The radio would be used in environments like the one Air Force F-15 pilot Capt. Scott O'Grady found himself in when he was shot down over Bosnia last year. It took rescuers about a week to find him.

The FY '98 DoD Director of Operational Test and Evaluation (DOT&E) report says that Boeing's [BA] Combat Survivor Evader Locator (CSEL) system, which guides rescue units to downed pilots, is not acceptable for combat use. "The CSEL configuration tested is not effective and not suitable," the report says. CSEL is intended to replace the PRC-90 and PRC-112 survival radios now used by aviators of all four services, providing a satellite communication link and real-time position data.

1999  FT. BELVOIR, Va.-The Air Force and Boeing [BA] recently said that the Combat Survivor Evader Locator (CSEL) program has demonstrated significant improvements in the past year after the Pentagon ruled it was not acceptable for combat use. The CSEL's performance showed significant improvement when compared to the testing results from the engineering and manufacturing development phase, Air Force Lt. Col. Norman Albert, CSEL program manager, told sister publication Defense Daily at a briefing

KY-913 Program Loader

Interrogators

Battery

Model	BA-5112/U
NSN	NSN 6135-01-235-4168
Chemistry (Primary)	LiSO2
Output:	11.8 Volts
Capacity	2000 mAh
Length:	3.06 inches
Width:	2.25 inches
Thickness:	1.54 inches

Battery Adapter

Takes 8each Energizer LS91 AA cells, i.e. a "12 Volt" adapter marked for use only on the PRC-112D.

Adapter, Battery
12/6/2013

NSN: 9540-01-504-8134


Use only 8 each Energizer 1.5 Volt LIthium 6135-01-333-6101.

Do not charge, short circuit, incarcerate or mutilate this battery otherwise battery may vent or rupture releasing toxic materials.

Warning: Do not use rechargeable batteries.


Battery Adapter

5940-01-504-8134

Use only on AN/PRC-112D Survival Radio

Warning: Do not use rechargeable battteries in this adapter.


To Open:
1. Remove locking "U" shape clip.
2. Squeeze notched fingers together and push them down to release end plate.

The convention that battery negative is the spring and the fixed contact is positive is NOT true for this adapter.
You MUST follow the polarity guide!  This may become a problem if the stick on guide is not noticed.
Black printing against Olive drab is very hard to see let alone read.


The battery adapter is thicker, it protrudes at the front and back of the radio. 
It's also wider and protrudes to the right. But not at all problematic.

NSNs

Model	Year	NSN	Mfg	Features
AN/PRC-112		5820-01-279-5450
AN/PRC-112A		5820-01-280-2117
AN/PRC-112B GPS-112 Hook-112	1995	5820-01-417-8752	Mot	applique adds GPS
AN/PRC-112B1			GD	App. adds GPS, 2-way messaging and encryption
AN/PRC-112C		5820-01-458-6018
AN/PRC-112D	2006	5820-01-500-1535	EPS	GPS + AA batteeries
AN/PRC-112E
AN/PRC-112F
AN/PRC-112G		5820-01-605-5854 5820-01-504-5465	GD	121.5, 123.1 MHz; 225–320 MHz; 406 SARSAT 406.028 MHz

Manuals

TM11-5820-1037-13&P

Patents

3656159 Minimum size Transponder, (Motorola), Apr 1972, 342/51 ; 327/176; 327/294 -
5394156 Digital range turn-around for tracking, telemetry and control transponder, (Motorola), Feb 28, 1995 -
5726663 Survival radio interrogator, (Motorola), Mar 10, 1998, 342/419 ; 342/357.09; 342/386; 701/213

Survival radio interrogator (1) transmits upon request a message including an identification of survival radio (3). Upon receiving and processing this message, survival radio (3) determines its position from the Global Positioning System and transmits a message back to the search aircraft...
This is the GPS-112 and Quickdraw Interrogator.
Calls:

5365451	Mobile unit tracking system	Motorola	Nov 15, 1994	GPS based
5389934	Portable locating system	Business Edge Group	Feb 14, 1995
5414432	Position locating transceiver	Motorola	May 9, 1995	GPS, Iridium, Mil-Sat EAM
5438321	Location system (underground miners)		Aug 1, 1995
5515419	Tracking system and method for tracking a movable object carrying a cellular phone unit, and integrated personal protection system incorporating the tracking system	Trackmobile	May 7, 1996
5517199	Emergency locator device	Aerodata	May 14, 1996

6011510 GPS based search and rescue transceiver, (Motorola), Jan 4, 2000, "Hook PRC-112" to add GPS to the PRC-112

Calls:

U.S. Military survival radios

Military organizations still issue pilots and other combat personnel individual survival radios, which have become increasingly sophisticated, with built-in Distance Measuring Equipment (DME), Global Positioning Satellite receivers, and satellite communication. In slang terms "PRC" radios were called a "prick" followed by the model number, "Prick-25," and "URC" radios were called an "erk." United States military survival radios include:

• AN/PRC-17
• AN/CRC-7 - World War II era set, 140.58 MHz
  

• AN/PRC-32 - Navy rescue sets, 243 MHz.
• AN/PRC-49
• AN/PRC-63 - Smallest set built.
• AN/URC-64 - (Air Force), 4 frequency rescue sets. Four crystal controlled channels (225-285 MHz)
• AN/PRC-90 - Vietnam War era airman rescue set. AN/PRC-90-1 and AN/PRC-90-2 are improved, repairable versions. Operates on 243 and 282.8 MHz AM. The PRC-90 also included a beacon mode, and a tone generator to allow the sending of Morse Code.^[8][9]
• AN/PRC-103 - (Air Force) Rescue Swimmer Radio.
• AN/PRC-112 - Offers Synthesized radio in the VHF and UHF aircraft bands. A PRC-112 and a hand held GPS were used by Capt. Scott O'Grady when he was rescued after being shot down over Bosnia.^[11] The AN/PRC-112B, initially known as the Hook 112, is a PRC-112 modified to include a GPS receiver, allowing encrypted position information to be sent. Also has Cospas-Sarsat beacon. The latest model PRC-112G, built by General Dynamics can communicate with satellites as well.^[12] Over 31,000 radios in the PRC-112 family have been produced.
• AN/PRC-125 (Navy) Rescue Swimmer Radio.^[8][10]
• AN/PRC-149 Rescue Radio, replaces the PRC-90, PRC-112 and PRC-125 for non-combat use.^[14] Includes GPS and Cospas-Sarsat beacon.^[15] Operates on 121.5 MHz, 243.0 MHz, and 282.8 MHz and 406.025 MHz. Built by Tadiran, the PRC-149 uses standard D cell batteries, unlike other units that took special batteries.
• AN/PRQ-7 Combat Survivor/Evader Locator (CSEL) combines selective availability GPS, UHF line of sight and UHF satellite communications along with a Sarsat beacon. It can send predefined messages digitally along with the user's location.^[16][17] As of 2008, the PRQ-7 cost $7000 each, "batteries not included." A rechargeable lithium-ion battery pack cost $1600, while a non-rechargeable lithium-manganese dioxide unit cost $1520.^[18] As of Oct, 2011 Boeing has delivered 50,000 PRQ-7s.^[19]
• AN/URC-4 - 121.5 and 243 MHz^[8]
• AN/URC-11 - (243 MHz), "A" versions replaced one audio tube with transistors.^[8]
• AN/URC-10 - The RT-10 are subminiaturized, completely transistorized UHF radio sets. They consist of a crystal-controlled receiver-transmitter, a 16-v dry battery, and a power cable assembly. The unit operates on one channel in the 240-260 MHz band, usually 243 MHz. RT-60 and RT-60B1 were two frequency versions of the RT-10^[8][20]
• AN/URC-14 - (121.5 MHz)
• AN/URC-68 - (Army), 4 frequency rescue sets.
  
  
  

HOOK3 Combat Survival Radio (Updated Video)

               Marine Wing Communication Squadron 18 HF FEX

U.S. Marines with MWCS 18 Conduct in a HF FEX Exercise at Camp Courtney, Japan, Jan. 14, 2021.

*B-Roll* Communication Marines conduct field training exercise JAPAN 10.28.2019

                 Marines provide communications support for joint exercise