Radio station with AM. Scheme, description

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Radio station with AM. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Civil radio communications

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The supply voltage of this radio station is 9 volts. In receive mode, it consumes 15 mA, and in transmit mode - 25 mA. The communication range with a telescopic antenna with a size of at least 700 mm is 1 km.

The radio station is built according to the transceiver scheme. The signal from the antenna goes to the super-regenerative cascade on the VT3 transistor and then through the contacts of the "reception-transmission" switch - to the volume control and to the ULF input

(click to enlarge)

In the transmission mode, the signal from the ULF is fed into the collector circuit of the transistor VT2. Quartz is excited at a frequency of 27,14 MHz. The signal from the transistor VT2 is fed to the extension coil L3 and then to the antenna.

The details of the radio station are placed on a printed circuit board made of one-sided foil fiberglass measuring 80 x 55. The screen from the volume control to the emitter of the VT3 transistor is connected along the shortest path.

Details - any, small-sized. Output transformer - from the radio receiver "Selga-404" or similar.

The coils are made on frames with a diameter of 5 mm with trimmers made of carbonyl iron. They are wound with PEV-2 wire with a diameter of 0,3 mm. L3 is installed horizontally.

The antenna is connected to the extension coil with a minimum length of wire. The "reception-transmission" switch is of the P2K type. Dynamic head - type 0,5 GDSH-2 or similar.

Author: V. Ilyinov, Kiev; Publication: N. Bolshakov, rf.atnn.ru

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