Warsaw Pact Portable
DH4PY

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  PS 31
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    PS 31

is a portable radio built by TESLA (Czechoslovakia), that was used (also?) in the GDR. It uses simplex mode and has 70 channels in the 80 MHz- band. It is meant for connections to fixed and mobile stations and between PS 31.
The complete radio set is called PS-31, the radio alone is called PR-31.

In the GDR ist was used by the Stasi.

The PS 31 in the collection uses a key switch. There also were PS 31 with a simple on- switch (then the key could not get lost).

As special feature the PS 31 has a built in and switchable
speech encoding, also a transmitted
code to specify the activity at the given moment and a code
"emergency".

At the beginning of each transmission an identification code is automatically transmitted. During the transmission a single or uninterupted signal tone can be added.

The radio is carried in a thick leather bag on the left side of the body. The operational elements are on the upper and the front side.

On the upper side:

  • Plug for the speakermike,
  • Display of the code,
  • Keyboard to enter the code,
  • Key switch (unique)
  • Loudness
  • Antenna connector

    On the front side:
  • Two channel switches , between them the channel number,
  • Mode switch. Usable modes:
    * economical usage without speech encoding,
    * economical usage with speech encoding,
    * usage with speech encoding,
    * usage without speech encoding, squelch deactivated.

    The speakermike has the following operational elements and displays:
    * PTT- switch;
    * Red key "emergency".
    * Red luminescent diode that shows the battery condition.

    Two antennas are part of the station:
    * Miniflex antenna PA 31 (220 mm long) and
    * Steel spring wire antenna PA 32 (750 mm long) to cover greater distances.

    Frequency range:
    80- MHz- band

     

    Technical data:
    HF output:
    1 W
    Channels:
    70
    Channel spacing:
    25 kHz
    Mode:
    F3, simplex
    Sensitivity:
    0.7 µV @ 12 dB
    NF- output:
    400 mW
    Operational time at fully charged battery:
    8 hrs. at 1:1:8 (transmitting / receiving / stand by)
    Voltage:
    11.0 ... 14.7 V
    Battery:
    rechargeable "10 NiCd RS 500" ; 12 V 500 mA
    Consumption:
    Transmitting: 280 mA
    Receiving: 110 mA (at 400 mW loudness)
    Stand by: 10 mA
    Parts of the station:
    Radio PR 31
    Miniflex antenna PA 32
    Steel spring wire antenna PA 32
    Speakermike PO 31
    Battery
    Operational procedure