Modern Era FM Backpack Portables
DH4PY

To the picture gallery

 

 

 

      PRC-660
  PRC-25
      AN/GRM-55

 

 

 

 

 

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

  PRC-25

is the first US VHF transceiver for short distances in the tactical band. It is almost completely solid state, except one transmitter tube in the final stage.

It can be used as manpack, portable and vehicular radio. It was built in numerous countries and was the predecessor of many manpacks to come.
It is a legend, mostly because it was used in Vietnam.

For further infos see US military portable radios by Alan Tasker, WA1NYR.

PRC-25A and PRC-25B are radios with a slight change in schematics.
Many modules of PRC-25 and PRC-77 even may be interchanged. ( See link below to comparisons )

PRC-25-T
is a solid state version, developed by TADIRAN (Israel) for Greece.
RT-505/PRC-25-T
[ < klick ]
The frequencies differ from the "normal" PRC-25 or PRC-77:
  • 26 .. 71 MHz in two ranges
  • 26 .. 48 MHz and 49 .. 71 MHz.

    A battery of 12V only is needed, since the 3V required for the tube of the final amplifier of the PRC-25 are not necessary.

    Instead of the original short antenna AT-892 and the long antenna
    AT-271 ; a single combi antenna can be used:
    AS-2109
    Frequency range RT-505/PRC-25 :
    30 .. 75,95 MHz in two ranges:
    30 .. 52,95 MHz and
    53 .. 75,95 MHz.
    Frequency range RT-505/PRC-25- T :
    26 .. 71 MHz in two ranges:
    26 .. 48 MHz and
    49 .. 71 MHz

     

    Comparisons PRC-25, PRC-77 and PRC-77/25

    Early models     PRC-25 X2; PRC-25 X3; PRC-25 X4:
       see picture gallery
    Technical data:
    Modulation:
    FM
    Channel spacing RT-505/PRC-25:
    50 KHz.
    Channel spacing RT-505/PRC-25-T:
    50 KHz.
    Channel number RT-505/PRC-25:
    920.
    Channel number RT-505/PRC-25-T:
    920.
    HF- Output:
    1,5 .. 2 w.
    Frequency control:
    Synthesizer
    Squelch:
    150 Hz ( first radio ever to use it )
    Range:
    up to 8 km
    Antennas:
    portable short: AT892; 3 Feet.
    portable long: AT271/PRC; 10 Feet.
    Mobile: AT-912 or AS-1729
    Station: RC-292
    Long wire: AT-984
    --and others--
    Other accessories:
    Harness ST-138
    Handsets H-138 or H-189 ( dynamic microphones )
    Bag for accessories: CW-503
    Mounting AM-2060
    Battery:
    BA-4386 ( und others )
    Developed:
    1952 - 1962
    Year of issue:
    1962 ( built until 1970 )
    Replaces:
    PRC-8 / 9 / 10
    ==>>:
    "Survives one hour in 6 feet deep water..."