BOS radio

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   SEM 56
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  SEM 56

is a solid state pocket or handie radio for official use. As handie portable a microphone is plugged on. If this microfone is used with a cable, you have a pocket radio.

Built in the early 70s, it is offered as a 2m- or a 4m- version, dual conversion receiver. The radio here is a SEM 56-1620, the 2m- version. It uses mostly discrete semis except for 3 IC amplifiers in the ZF. Some features of its design continued in SEM-52A later

Many accessories provide a universal use; there is for example a rod antenna, a spiral antenna or a hidden antenna; or a wireless inductive earplug.

By using only two knobs, the operation is very simple:

  • One knob switches on/off and is used for loudness,
  • The second knob switches the squelch and tests the battery.

    The charger is used for the NiCad- battery and for the button-cell of the earplug.

    Frequency range:
    SEM 56-1620: 146 ... 174 MHz ( 2-Meter-Band )
    SEM 56-820: 68 ... 88 MHz ( 4-Meter-Band )

     

    Technical data:
    HF- output:
    500 mW
    Channels:
    1
    Frequency departure:
    20 kHz
    Mode:
    FM
    Sensitivity:
    < 0.8 µV @ 20 dB
    NF- range:
    300 ... 3000 Hz
    NF- output:
    30 mW
    Operation time:
    10 hrs at 10 % transmitting / 10 % receiving
    1 hr continuous operation at 500 mW
    Issued:
    in the early 70s