Spy radio
DH4PY

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  SP 20
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    SP 20

is a solid state West German spy radio; it was developed by Telefunken.
The first issues , used by the BND, had a grey color and consited of:

  • Transmitter S 8600,
  • Antenna tuner ASG 6800,
  • Synthesizer KS 30,
  • Power supply,
  • Receiver KE 30 (a Prototype, not always included) and
  • Burst coder RT-3, "Speicher" or GRA-71.
  • Accessories

    Later versions were painted green and carried in belt bags.
    The set consists of:
  • Transmitter S 8600,
  • Antenna tuner ASG 6800 and
  • Synthesizer KS 30,
  • Accessories.

  • This is the collection's version.

    All the housings have the same size: H 3.2 x L 15.5 x W 10.5 mm and a weight between 700 and 800 grams.

    The Transmitter S 6800 works in CW (A1) mode. Like all spy radios, a key or a burst coder can be used. The transmitter is protected against wrong operation.

    The Synthesizer KS 30 was issued, working in 1 kHz increments. The frequency is switched by pushbuttons and is indicated by 7- segment- LEDs.

    The antenna tuner ASG 6800 is operated manually and tunes all kinds of antennas. Six filters for 3.2, 4.6, 7, 11, 16 and 24 MHz can be switched. To test the transmitter, the signal can be switched to a dummy load.
    A small accessory box also is part of the set.

     
    S 6800 (Transmitter)

    (click picture to enlarge)

    ASG 6800 (Antenna tuner)

    (click picture to enlarge)

  • Transmitter S 6800,
  • antenna tuner ASG 6800 and a
  • power supply (not in the collection)
    were developed and built by Telefunken.

    The Synthesizer- unit KS 30 was developed an built by Pfitzner later.  
    KS 30 (Synthesizer)

    (click picture to enlarge)

  • A receiver KE 30 was built as prototype only in small numbers by Pfitzner. (not in the collection). It almost looks like the synthesizer.

    A burst coder, in the collection, used with the radio set is:
  • GRA-71
    Frequency range:
    Transmitter S 6800: 2 .. 24 MHz
    Receiver KE 30: 2 .. 24.999 MHz

     

    Technical data:
    HF output:
    25 W
    Increments:
    1 kHz
    Frequency control:
    Crystaks or synthesizer
    FSK- Shift:
    +- 100, 200, 400 Hz
    NF- output:
    High impedance headphones
    Operational voltage:
    12 V
    Power supply: 110V, 220V AC; 6 - 24V DC
    Power consumption:
    3 A