Modern Era SSB Sets
DH4PY

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      AN/PRC-70
   PRC-104
      AS-2259/GR

 

 

 

 

 

As successor of the PRC-47 Hughes developed the

  PRC-104

It is a portable HF transceiver also for transmitting data. It is part of the modular
High Frequency Radio Systems, (IHFR).

and consists of:

  • RT 1209 / URC Transceiver
    This is a miniturized SSB- transceiver in USB. LSB or Data mode from 2 to 29.999.9 MHz 100 Hz increments. Connections are provided for handset, headset, CW key or data input. The transmitter's output is a carrier of 250 mW. 26.5V, needed for the transceiver, are provided by the amplifier / tuner unit.

  • AM-6874 / PRC-104 Amplifier and tuner
    amplifies the 0.25W from the transceiver to 20 W , has a built- in tuner and can switch the antenna output to three antennas:
  • 9 .. 16 foot rod antenna
  • BNC- plug for an antenna that can be tuned (e.g. the AS-2259),
  • BNC- plug for a 50-Ohm-antenna.

    CW can be used up to 300 WPM - so the PRC-104 is compatible to the code burst generator GRA-71.
    Frequency is selected by decade pushbuttons.

    Unlike its predecessors, there are no operational elements or lamps on the front. These functions are checked by the radio itself, and momitored as special tones to the handsets- especially useful at a tactical blackout.

     
    The burst coder GRA-71 (<= link)
    can be used in combination with the PRC-104.

    Frequency range:
    2 ... 30 MHz

     

    Technical data:
    Modulation:
    USB, LSB, CW
    Channel spacing:
    100 Hz
    Frequency switch:
    Decade pushbuttons
    Antenna tuning:
    automatic, digitally
    Frequency control:
    Synthesizer
    Output power:
    20 W
    Sensitivity:
    0.5 µV
    Year of issue:
    from 1976