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SEM 27-820 GWL
was built by Standard Elektrik Lorenz.
It is a BOS radio in the 4m- band for mobile or fix station use.
240 channels, 120 each in the upper- and lower band are used.
A 10-watt-amplifier for loudspeaker announcments is built in.
All operational elements and the loudspeaker are situated on the front panel;
connectors for battery and announcment- speaker are on the right side.
The circuit:
The radio is an excellent example of using several generations of active elements in one radio:
Tube in Noval Technique (QQE 03/12)
Tubes in pencil technique (EF 732.....)
Ge-transistors in glass housing (OC...-types)
Ge-transistors in metal housing (AF...-types)
Si-transistors in metal housing (2N....-types) "
- Frequeny range:
- Lower band 75.275 .. 77.655 MHz (channels 400U to 519U)
- Upper band 85.075 .. 87.455 MHz (channels 400O to 519O)
Technical data:
- Channels:
- 240
- Channel spacing:
- 20 kHz
- Changing of bands:
- By the switch Oberband / Unterband
- HF- output:
- 10 W
- HF- impedance:
- 60 Ohm unsymmetrical
- Mode:
- F3 (FM)
- Call tones:
- 1750 and 2135 Hz
- Squelch:
- Can be switched off
- NF- frequency:
- 300 ... 3000 Hz @ +1 ... -3 dB
- Receiver sensitivity:
- 0.5 µV @ 20 dB
- NF- output:
- Loudspeaker built in 0.8 W / 5 Ohm
- Announcment loudspeaker 10 W / 15 Ohm
- Powered by:
- Version I: 6 or 12 V, switchable
- Version II: 12 or 24 V, switchable
- Power consumption @ 12 V:
- Receiving 1.2 A; transmitting 5.3 A
- Active elements:
- 50 Transistors, (35 Germanium)
- 35 Diodes
- 3 Zenerdiodes
- 5 Tubes
- 22 Crystals
- Measurements and weight:
- H 90 x B 290 x T 470 mm; 12 kg
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FuG 9
80 E 11