UM 3

is a HF amplifier, intended for amplifying radios of low power R 105 D, R 108 D, R 109 D and R 114. Also other radios of low power  can be amplifyed.
It is not portable as e.g UM-1 or UM-2 but consists of two single parts, the power supply and the radio.

Frequency range:

20.0... 46.1 MHz,   divided in three ranges.

Mass + weights:

L/b/h: 240 x 165 x 200 mm, 4.1 kgs.

Transmitting power

50 Watts.

Rated voltage

11.. 13 V.

Power supply

either by 2 batteries 5NKN45 or by car battery.

Power consumption

19 A.

Actual working time (batteries):

8 hrs with a transmission/receiving relation 1:3,