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179:. A regenerative detector with adjustable feedback is used. The transmitter section includes a 2K2M modulator valve, a CO-257 buffer amplifier valve, and a CO-257 power amplifier valve. Switching from reception to transmission is achieved by switching the power from the heater circuits of the receiver and transmitter valves, alternately.
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A-7a is a simplified version of the A-7. The total number of valves was reduced to 9. In the transmitter section, the functions of the modulator and power amplifier were combined into one valve, and in the receiver section one valve was used to simultaneously perform the functions of a high-frequency
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The A-7 is a portable man-pack, radio transceiver with narrow-band frequency modulation. The set can be used as a radio telephone in a wired network and managed remotely. Setting the frequency of the receiver and transmitter circuits is adjusted in tandem by one control handle. The antenna and buffer
242:). The ability to work by telegraph was removed. Energy consumption was decreased by about 30%, other main characteristics were not changed. The A-7a set was manufactured by various factories in several different variants: with and without a tone button, with one or two measuring instruments, etc.
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The transceiver with power supplies and accessories is housed in a wooden box with shoulder straps for carrying as a backpack. For long distances, the set is carried by two soldiers. The set only requires one radio operator. The deployment time is typically not more than five minutes.
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A-7b is a ten-valve version introduced in 1945. In the transmitter section two output valves are used in parallel. The transmitting range was increased by around 50%. The frequency range is 24-28 MHz. There is no feedback adjustment in the detector circuit.
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Power source: two dry anode batteries BAS-80 with a total voltage of 160 V and two 2 NKN-10 nickel-cadmium batteries. The time of continuous operation from one set is 35–40 hours.
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and used for communication in rifle brigades and regiments. The complete station was designed to be transported by an individual soldier.
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The A-7b was also manufactured from 1950 to 1956 in
Pardubice, Czechoslovakia by the
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Dimensions of the transceiver (without protruding parts): 285 × 135 × 165 mm.
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On slightly cross-country terrain outside of buildings - 10 km and more.
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oscillator circuits are common for the receiving and transmitting circuits.
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design with a single frequency conversion, consisting of 8 identical 2K2M
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Mass of the radio station: 15.5 kg, the battery weighs 6 kg.
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Antennas: a whip with a height of 2.5 m or a flexible wire 6.4 m long.
19:"A7a" and "A7b" redirect here. For the aircraft (A-7A and A-7B), see
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http://www.rkk-museum.ru/documents/archives/images/2-43-01.pdf
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Dimensions of the packing box: 210 × 385 × 330 mm.
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World War II military equipment of the Soviet Union
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142:VHF radio transceiver (later models include the
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238:and low-frequency amplifier (the so-called
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16:Portable military VHF radio transceiver
199:Intermediate frequency: 1100 kHz.
196:Sensitivity of the receiver: 1-1.5 μV.
208:On rough terrain - up to 7–8 km.
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294:User manual. Retrieved 15 July 2018.
54:adding citations to reliable sources
211:On urban conditions - 3–4 km.
190:Number of frequency channels: 101.
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187:Frequency range: 27-32 MHz.
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41:needs additional citations for
328:Military electronics of Russia
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193:Transmitter output power: 1W.
308:Radiomuseum: A7 transceiver
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338:Radio in the Soviet Union
150:) was developed during
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65:"A-7" transceiver
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158:Design and features
134:A-7 VHF transceiver
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21:LTV A-7 Corsair II
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