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The complete station was designed to be transported by an individual soldier.
The set can be used as a приведенная ссылка 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 oscillator circuits are common for the receiving and transmitting />The receiver section is a design with a single frequency conversion, consisting 8 identical 2K2M.
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.
The transceiver with power supplies and accessories is housed in a wooden box with straps carrying as a backpack.
For long distances, the set is carried by two soldiers.
The set only requires one radio operator.
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The time of continuous operation from one set is 35—40 hours.
The total number of valves was reduced to 9.
In the transmitter section, the functions of the modulator and power were combined into one valve, and in the receiver section one valve was used to simultaneously perform the functions of a high-frequency and low-frequency amplifier the so-called.
The ability to work by telegraph 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, />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.
The A-7b was also manufactured from 1950 to 1956 in Pardubice, Czechoslovakia by the company.
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It's a great push-to-talk over cellular (PoC) alternative for businesses organizations. Learn more about the best talkie app in the market.
A-7 VHF transceiver The Soviet A-7 VHF radio transceiver later models include A-7a and A-7b was developed during used for communication in rifle brigades and regiments.