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Wearable VHF-FM radio station "R-105M", "R-108M", "R-109M" released from 1967. Portable knapsacks VHF-FM radio station '' R-105M '' replaced the outdated radio station '' R-105D ''. The upgraded radio stations were also produced in 3 versions: '' R-105M '', '' R-108M '' and '' R-109M '' and differed from each other in different frequency ranges that coincide with the old versions of radio stations '' R -105Д '', but having more working channels in each band. The frequency range of the radio station "R-109M" - 21.5 ... 28.5 MHz (13.95 ... 10.52 m), the radio station "R-108M" - 28.0 ... 36.5 MHz (10.7 ... 8.22 m), and the radio stations "R-105M" - 36 ... 46.1 MHz (8.3 ... 6.5 m). The radio station of the type "R-105M" is receiving and transmitting, with the possibility of remote control and retransmission of signals. All radio stations are equipped with whip antennas, short and long, as well as a directional beam antenna. Radio stations allow communication when they are located on the ground, behind a walking radio operator, and also aboard a car when moving from an underground shelter using a 10-meter coaxial feeder. Radio stations provide a communication range of up to 30 kilometers with high efficiency and noise immunity. DEMSH-1 type microphone and TA-56m headphones are combined into a headset. You can use the headset in the form of a handset. Radio stations are powered by 2 batteries of type 2KNP-20 or 4 elements of KN-14 with a total voltage of 4.8 v. Frequency modulation, simplex communication. Sensitivity 1.5 µV. Optical scale with tick marks of 25 kHz. Transmitter output power 1 watt. 5 kHz deviation.