Modern Era FM Backpack Portables
DH4PY

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      PRC-80
  Sincgars,
  PRC-119; RT-1439
      TRA-967

 

 

 

 


All American Backpack- Radios from their beginning (1938) till 1990 are in the collection. The chart can be used as quick navigation between the radios.

TBY

SCR-194/ BC-222 (BC-322)

SCR-300/ BC-1000

RT-174/ PRC-8/9/10//A

US Backpacks

RT-70/PRC-16

RT-505/ PRC-25

RT-841/ PRC-77

RT-1439/ PRC-119 RT-1523/PRC-119


Abbreviations:

  SINCGARS = Single Channel Ground and Airborne Radio System
  ICOM = Integrated COMSEC;
  COMSEC = COMmunications SECurity
  ALICE = All-purpose Lightweight Individual Carrying Equipment
  FH = Frequency Hopping
  SC = Single Channel (Einzelkanal)
  RT = Receiver Transmitter


History

In the Vietnam- and Post-Vietnam-Era PRC-25 and PRC-77 were used (also as mobile versions); in addition to the VRC-12 series. All of them could be jammed very easily:
At switched on 150-Hz tone squelch the radios stay in receive mode, no matter who transmits the tone.
Using a fixed channel, (FC) it can be found and jammed quickly.

SINCGARS

That is why the SINCGARS - system was chosen for the next generation radio.
SINCGARS radios use frequency hopping (FH) over the complete tactical band of 30 to 87.975 MHz ( 2.320 channels). The operating frequency is changed 100 times per second.
Using SC mode, SINCGARS radios are compatible with their predecessors of the VRC series and the PRC-77 - and can be jammed as easily.

The basic set of all SINCGARS- variants is the (Receiver-Transmitter) RT-1523 or RT-1439.

The RT-1523 has built-in COMSEC- circuits; the RT-1439 uses an external COMSEC device.


The collection holds a:

RT-1439

The radio can be used either in frequency hopping mode(FH) , or in single channel mode (SC). It is compatible with all tactical (also older) radios of the US forces and their allies. It has a built in whisper mode.

The predecessor PRC-77 could transmit a data signal of 16 kbit / sec., but not a PC- compliant signal. Singcars- radios have an audio/data- input plug for synchronic und asynchronic data modes up to 16 kbit /sek.

An integrated self test shows faulty circuits.

CY-8523B/PRC
is one of the battery boxes for the Sincgar series. Two parallel batteries BA-5590 are used for the voltage of 12V.
Two outside contacts connect the main block to the remote control unit (Remote Control Unit - RCU) C-11561. This unit C-11561 looks similar to the RT-1439; both use the same battery box.

Additional items are used to equip the RT due to its needs:
Mounting MT-6352, Mounting adapter AM-7239, HF- amplifier AM-7238. et. Special braodband antennas are used, that do not need to be matched.
Addition items are: Loudspeaker, programmers for FH, remote control sets, and more.

The assembled radio sets are::

AN/PRC-119

(here with RT-1439 main block): RT-1439, battery box with battery, handset, portable antenna, and ALICE-Pack.

AN/VRC-87
is the simple mobile radio and consists of: RT, mounting, mounting adapter, mobile antenna, handset and cabling.

AN/VRC-88.
is a VRC-87, with all additional parts that form a PRC-119. The RT can be removed, and a battery, battery box, portable antenna ans ALICE-pack form a PRC-119.

AN/VRC-89
is the retransmit- version of the AN/VRC-87. A second RT, a HF amplifier, a mobile antenna and a handset are added.

AN/VRC-90
is a VRC-87 with HF amplifier.

AN/VRC-91
is an AN/VRC-90 with all parts needed, so that you can take out the RT and put together a manpack (PRC-119).

AN/VRC-92
is an AN/VRC-89 with second HF amplifier. So both RT can be used at maximum range.


The versions for use in aeroplanes are optically different from the above mentionned radios; technically they are not different. There are three version; all of them can not be remote controlled.

RT-1476/ARC-201
is the basic version.

RT-1477/ARC-201
has a second operation front, and can ba built in apart from the pilot's place. This version can be used as retransmit radio.

RT-1478/ARC-201
can transmit data of 600 and 1200 Baud.

Frequency range:
30 .. 87.975 MHz

 


Technical data:
HF output:
500µW; 160mW; 4W
Range:
200 .. 400 m; 400 m .. 5 km; 5 km .. 10 km
Channel spacing:
25 kHz or tunable
Frequency control:
Synthesizer
Mode:
FM
Operational mode:
Single channel (SC) or frequency hopping (FH)
Offset for SC:
+ 5 kHz, + 10 kHz
Channels:
6 for FH, 8 for SC
Sensitivity:
0.35 µV
Audio frequency:
300 .. 3000 Hz
Data transmission:
75, 150, 300, 600, 1200, 2400, 4800, 16000 bps, AD1, AD2
Handset:
H-250 or
Handset C-12493/U : HRCRD (Handheld Remote Control Radio Device:
This handset operates the radio without the need to set it down.
Antenna:
AS-3638, AS-4266
Battery voltage:
13.5 V (nominal 15 V)
Power consumption:
3,25 A transmitting, 225 mA receiving
Doenward- compatible to:
VRC-12 series and PRC-77
Issued from:
1990