PLRS EPLRS Position Location Reporting System

Operaten above the UHF-AM aircraft band at in the 420 to 450 MHz range with a direct sequency spread spectrum TDMA signal that's 3 Mhz wide.  Note this is not frequency hopping like in the SINCGARS radios.

Related systems are the Near Term Digital Radio (aka: Near Term Data Radio, NTDR), Joint Tactical Information Distribution System (JTIDS) uses LINK 16 TDMA, Multifunction Information Distribution System (MIDS) also a LINK 16 system, Joint Tactical Radio System (JTRS) covers 2 to 2,000 MHz.

YouTube:  History of Modern Communications Receiver- Part 1 ~ 02/07/2024, 1:20:52 -

126356 Improvement in collecting electricity for telegraphing, William H. Ward, 1872-04-30 - static electricity collector
129971 Improvement in telegraphing, Mahlon Loomis, 1872-06-30 - single wire plus ground replaces two wire system.
803684 Instrument for converting alternating electric currents into continuous currents, John Ambrose Fleming, 1905-11-07, - vacuum tube diode
879532 Space telegraphy, Lee De Forest, De Forest Radio Telephone Co, 1908-02-18, - triode
1113149 Wireless receiving system, Edwin H Armstrong, 1914-10-06, - "regenerative system" used in W.W.I - allowed the use of loud speakers

RCA Regenerative Receiver uses patents dated: 1-13-07, 2-18-08, 10-6-14, 7-3-17, 5-10-21

1424065 Signaling system, Edwin H Armstrong, 1922-07-25, -

YouTube:  History of Modern Communications Receiver- Part 2 ~ 02/28/2024, 1:26:37 - @1:11:44 Bash one Radio: JTRS, EPLRS,

Receiver-Transmitters

AN/TSQ-129 PLRS (FAS: PLRS)

RT-1720
RT-1573/x EPLRS
RT-1678/x EPLRS
RT-1719/x EPLRS

Control Head

Marked:
Part No. A3271224
NSN: 5895-01-452-1222
Contract No. DAAB07-98-C-C618
Mfr: White Electronic designs Corp -
CAGE Code: ?9479  (internet shows 54230?)
Ser. No. 0005xx

PSQ-4 Man Pack

C-10830/PSQ-4 User Readout (URO) or ruggedized Portable Computer (PC) i.e. CF-28 Toughbook
SM-D-912805 URO Cable Assy

AS-3448/PSQ-4	AS-3448/PSQ-4 420 - 450 MHz Antenna 80063  A3005021 MFR 57010 NSN 5825-01-106-9123 Spec A3005026 Contract DAAB07-83-C-J031

A3043298 Installation Kit
MP-RS Man Pack Radio Set
CY-7871A/PSQ-4 (p/n: A3159263) Dual BA-5590 type Battery Box

VSQ-2 Ground Vehicle

SV-RS Surface Vehicle Radio Set
Antenna: AS-3449/VSQ-1
PP-7641/VSQ-1 Power Supply (9.5 pounds!)

	What is the mating Connector?

GRC-229 Grid Reference

p/n: A3043143
NSN: 5895-01-277-4806

AN/GRC-229
p/n: A3043145
NSN: 5895-01-279-5452

AN/GRC-229C
p/n: A3275955
NSN 5895-01-462-8405

GR-RS Grid Reference Radio Set

AN/PSM-45(*) Radio Mount

AN/ASQ-177 Airborne

AV-RS Airborne Vehicle Radio Set
RT-1343 or RT-1344
ASQ-177 Voltage Regulator


Pilot Control Display Panel (PCDP)

TM 11-5825-283-10, Operator’s Manual, dated 1 March 1999
TM 11-5825-283-20&P Service & Parts Manual, 

5164959 Digital equalization method and apparatus (Hughes) - PLRS & JTIDS developed by Hughes (ph 60)

5166694 Vehicle location system having enhanced position location processing (Hughes) - EPLRS over determined hyperbolic system
5428603 Synchronous time division multiple access interrogate-respond data ...
6232909 Communication network optimization tool (Army) - EPLRS "909" patent
6844841 Radio frequency link performance tool process and system (Army)
7586891 Communication network optimization tool

Ebay for the RT
BPB Surplus for the Battery Box
Mike Murphy for the User Readout & PP-7641 Power Adapter

Army seeks 'perfect' radio, creates boondoggle - problems with Joint Tactical Radio System (JTRS)