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Wearable VHF-FM radio station "R-105D", "R-108D" and "R-109D" were produced since 1957. Radio type "R-105D" code name "Astra-3", backpack, wearable, ultra short wave, telephone, frequency-modulated, transceiver, with remote control and the ability to relay signals from other radio stations. Designed for searchless and bespodstroechnoy communication in radio networks or car radio centers. Radio stations of the type "R-108D" and "R-109D" ("Astra-2", Astra-1 ") have the same design, electrical circuit, parameters and differ in the range of operating frequencies. 'Р-105Д' '- 36.0 ... 46.1 MHz. In the range are 203 operating frequencies. '' Р-108Д '' - 28.0 ... 36.5 MHz. In the range is 171 operating frequency. "R-109D" - 21.5 ... 28.5 MHz. In the range is 141 operating frequency. Technical characteristics of the radio station "R-105D". Frequency range: Transmission 36.0 ... 46.1 MHz. Receive 36.0 ... 46.1 MHz. Frequency step: gradual tuning on a scale through 50 kHz. Frequency display: optical scale. Type of radiation: FM. Operating temperature range -40 50 ° C. Antenna connector for Kulikova antenna bayonet. The antenna impedance is 1 ... 2000 ohms. Power source two batteries 2NKN-24 or 2KN-32. Supply voltage 4.8 V (2x2.4 V). Battery life (3: 1 reception / transmission) 12 hours with a KH14 battery and 17.5 hours with a 2NKP-20 battery. Transmitter: type smooth local oscillator (L.C generator). Output power not less than 1 watt. Maximum frequency deviation ± 7 kHz. Receiver: type of superheterodyne with one transformation. Sensitivity is not worse than 1.5 µV with a signal-to-noise ratio of 10: 1. The radio station has antenna devices of the following types: 1.5 m high whip antenna (using or without a counterweight of 3 beams); a combined antenna consisting of a flexible whip antenna and 6 bends (total antenna height 2.7 m), using a counterweight of 5 beams for parking; the onboard antenna consisting of a combined whip antenna, a special bracket, with a shock absorber for mounting the antenna on board the car and connecting the conductor with a length of 1 meter, for working on the car; beam antenna directional length of 40 m, suspended at a height of 1 meter above the ground to work at elevated distances and from shelters; elevated antenna consisting of a beam antenna 40 m long lifted from the radio station to a height of 5...6 m, with a gradually decreasing opposite end directed at the correspondent, for work at increased ranges and from shelters. With a combination of different antennas, a confident connection between two radio stations of the same type is possible at a distance of up to 10 kilometers using simple antennas and up to 35 ... 40 kilometers using complex antennas.