Wearable VHF-FM radio stations R-105D, R-108D and R-109D.

Receiving and transmitting radio equipment.The R-105D, R-108D and R-109D wearable VHF-FM radio stations have been produced since 1957. A radio station of the R-105D type, code name Astra-3, backpack, portable, VHF, telephone, with frequency modulation, receiving and transmitting, with remote control and the ability to retransmit signals from other radio stations. Designed for search-free and tuningless communication in radio networks or car radio centers. The R-108D and R-109D (Astra-2, Astra-1) radio stations have the same design, electrical circuit, parameters and differ in the operating frequency range. 'R-105D' '- 36.0 ... 46.1 MHz. There are 203 operating frequencies in the range. R-108D - 28.0 ... 36.5 MHz. There are 171 operating frequencies in the range. R-109D - 21.5 ... 28.5 MHz. There are 141 operating frequencies in the range. Technical characteristics of the radio station "R-105D". Frequency range: Transmit 36.0 ... 46.1 MHz. Reception 36.0 ... 46.1 MHz. Frequency step: smooth tuning along the scale through 50 kHz. Frequency display: optical scale. Radiation type: FM. Operating temperature range -40 +50 ° С. Antenna connector for Kulikov's antenna is bayonet. Antenna impedance 1 ... 2000 Ohm. Power supply two batteries 2NKN-24 or 2KN-32. Supply voltage 4.8 V (2x2.4 V). Operating time with a battery (reception / transmission 3: 1) 12 hours with a KN14 battery and 17.5 hours with a 2NKP-20 battery. Transmitter: type smooth local oscillator (LC oscillator). Output power is not less than 1 W. Maximum frequency deviation ± 7 kHz. Receiver: superheterodyne type with one conversion. Sensitivity not worse than 1.5 μV at a signal-to-noise ratio of 10: 1. The radio station has antenna devices of the following types: flexible whip antenna 1.5 m high (with or without a 3-beam counterweight); a combination antenna consisting of a flexible whip antenna and 6 bends (total antenna height 2.7 m), using a 5-beam counterweight for parking operation; an on-board antenna consisting of a combined whip antenna, a special bracket, with a shock absorber for mounting the antenna on board a car and a connecting conductor 1 meter long, for working on the move of the car; directional beam antenna 40 m long, suspended at a height of 1 meter above the ground for working at increased distances and from shelters; an elevated antenna, consisting of a beam antenna 40 m long, raised near the radio station to a height of 5 ... 6 m, with a gradually decreasing opposite end directed at the correspondent, for working at increased distances and from shelters. With a combination of different antennas, reliable communication 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.