Modern Era FM Backpack Portables
DH4PY

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      TFF 8
  SEM 35
      LS 35-53

 

 

 

 

 

  SEM 35

is a fully transistorized backpack. It is the portable variant of SEM-25; many modules are the same in both of them.
In the German BW it replaced the former radios PRC-8, PRC-9 and PRC-10.

The former PRC-x - radios together had a frequency range of 20 to 55 MHz; the SEM-35 has 26 to 70 MHz; this not yet the frequency range for the Tactical band today: 30 to 76 MHz.

Main disadvantages for the SEM 35, compared to the PRC-77 are said to be: the heavy weight, and the power consumption could be less. The usage of everyday A- batteries (SEM 35) , compared to special batteries (PRC-77), however, compensates part of this drawback.

The radio SEM-35 with battery box:

SEM-35 (shown new)

together with the Supplement 5 (Rucksack, long and short antenna, handset, additional battery box)
Supplement 5 (shown new)

becomes the
portable radio SEM-35
(backpack radio) with short or long antenna.

Using the
Supplement 3 (shown new)
(mounting plus cables) it is a mobile radio set.

SEM-35 on mounting

Connected to the vehicle's cables, it can be used as substitute of a SEM-25. In this case it is powered by the vehicle's battery.
The battery box stays connected, so the SEM-35 can be easily removed from the mounting and used as backpack.
The mounting also operates the ATU (AGAT):
AGAT

Two radios can operate as rebroadcasting station. Together with the rebroadcasting set it can consist of:
* two radios SEM 35
* one SEM 35 and one SEM 25
* one SEM 35 and one PRC-8 ... 10.

Rebroadcasting set

Frequency range:

26,0 ... 69,95 MHz

 


Technical data:

Mass + weights:
Radio: 222 x 268 x 330 mm; 8 kg.
Baseplate 120 x 300 x 320 mm, 9.5 kg
Transmitting power
adjustabe 1 W/150 mW, FM
Frequency departure
+ - 3.5 kHz.
Frequency selection:
switches,
Channel spacing
50 kHz
Channels
880
Sensitivity,
0.5 µV with signal-to-noise ratio of 20 dB
Power supply:
18 V from mono cells or 21 to 29 V from car battery.
Parts of  SEM 35:
Transceiver, battery pack
Supplement 5
Back carrying bag, antenna long, antenna  short, antenna foot for
anntenna long + short,  handset, battery pack.
Supplement 3
Baseplate with cables
Pinpointing addition is desperately looked for!!

Radio jamming device for use with SEM-25:
ECM/FSS 209