Modern Mobile FM Sets
DH4PY

Click picture to enlarge

 

 

 

      XK 405
  SEM-90
      A/VHF

 

 

 

 

 

  SEM-90 ( SEM-80):

is a modern mobile radio. Frequencies are set by

  • "Handwahl (HW)" hand, using fixed frequencies ; or by
  • "automatischer Kanalwahl (AKW)" , scanning frequency bundles.

  • The radio set without the LV-90 is called SEM-80.
    Parts of the radio set:

    Main block A/VHF , consisting in

  • Main block A/VHF and
  • "automatischer Kanalwähler FSP 70" the automatic frequency changer.
    (The main block is part of SEM 70 / 80 / 90.)
    FSP 70 has 10 memories, each serving 16 channel bundles.
    The main block cannot be used standing alone.

    Frame FT 80 with built- in

  • 1-Watt-NF-Amplifier
  • HF-set
  • Power supply

    Booster LV 90

  • amplifying the main block, providing 40 W Hf.
  • ( without the LV-90 the radio set is called SEM-80.

    Mounting GP-80:

  • SEM-90 does not work without GP-80. GP-80, however is no part of radio set SEM 90.

    Mounting GP-80 and radio set SEM-90

    SEM-90 Relais set

    Fixed station antenna STA-80:

  • with Antenna base FAF-80: contains a lightning protection and an EMP- protection (ElectroMagnetic Pulse). Two bipolar clipping diodes belonging to this protection need a bias voltage of -50V supplied via the antenna cable. The feedpoint of the antenna is matched to 50 ohms for the frequency range from 30 to 80 MHz by broadband antenna matching.

    Mobile antenna FA-80

    Indicator (Which radio is in use)

    H-155 with cable FuK 2

    Prototype SEM-80:
  • Prototypes are offered from time to time, of them I only know SEM-80 prototypes. They have no automatic frequency changer, this part of the front is flat. The built-in modules are not compatible to the versions that were officially issued.

    Freqency range:
    30.000 ... 79.975 MHz

     

    Technical data:
    HF output:
    low: 4 Watt
    high: 40 Watt
    Powered by:
    car battery
    Channel spacing:
    25 kHz
    Modulation:
    Frequencies set by hand: FM
    Automatic frequency setting : digital, delta modulation
    Data transmission:
    up to 16 kBit
    Antennas:
    car antenna FA 80 or
    fixed antenna STA 80
    Range:
    depending on antenna or output: 9 ... 30 km.
    Hints:
    The mounting GP 80 is needed for vehicular use. However, it is not part of Set SEM 80 nor SEM 90.