PLRS EPLRS Position Location Reporting System

© Brooke Clarke 2010 - 2024

Background
Components
Configurations
EPLRS Position Location Reporting
                System RT-1574/G
EPLRS Position Location Reporting
                System RT-1574/G
EPLRS Position Location Reporting
                System RT-1574/G
EPLRS Position Location Reporting
                System RT-1574/G
EPLRS Position Location Reporting
                System RT-1574/G
EPLRS Position Location Reporting
                System RT-1574/G
EPLRS Position Location Reporting
                System RT-1574/G

Background

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,

Components

Receiver-Transmitters

AN/TSQ-129 PLRS (FAS: PLRS)

RT-1720
This radio was made in versions:
RT-1720A(C)/x where x is between no letter and G
RT-1720B(C)/x  "
RT-1720(C)C/x  "
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

EPLRS Position Location Reporting System
                      Control Head p/n: A3271224



Configurations

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


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!)
PP-7641/VSQ-1 Power
                    Supply

PP-7641/VSQ-1 Power
                    Supply
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)

Manuals

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

Patents

5164959 Digital equalization method and apparatus (Hughes) - PLRS & JTIDS developed by Hughes (ph 60)
many patents are called by and are called by newer patents

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

Sources

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

Links

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

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[an error occurred while processing this directive] page created 18 Mar 2010.