SEM 47- 820 GW

Is a compact mobile 4m- BOS- radio
( Behörden und Organisationen mit Sicherheitsaufgaben ) ( For authorities and safety related tasks )

It has only two tubes in the transmitter, the rest of the circuit is transistorized.

All operational elements, also loudspeaker and connectors for the handset, are on the front.

All modules are screwed tight and can be tuned seperately.

It is powered by 6, 12 or 24V.

(There also was a SEM 47- 1620 G for the 2m- band.)

Frequency range:

Transmitter 68 .. 78 MHz

Receiver 68 .. 88 MHz

Channels:

10 maximum

Channel spacing:

20 kHz

Transmit/receive departure:

9.8 MHz

Output:

12 or 6 W

Antenna impedance:

60 Ohm not symmetrical

Mode:

Phase modulation, or FM

Crystals per channel:

2

Sensitivity:

0.5 µV @ 20 dB

Squelch:

can be switched off

Call tones:

1750 and 2135 Hz

Also 910, 1120, 1370 Hz can be provided

Active elements:

2 tubes

41 transistors

Additional items:

Selektive tone set SRS 47-45

NF- power amplifier LVB 12 T

Speech inverter SI 5

Consumption @ 12V:

transmit 4.5 A

receive 1 A