Transmitter with amplitude modulation 27-28 MHz. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transmitters
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The device is a transmitter operating in the range of 27-28 MHz with amplitude modulation. Range up to 100 m. Schematic diagram of the device is shown in the figure.
(click to enlarge)
The transmitter consists of a high-frequency generator assembled on a VT2 transistor of the KT315 type, and a single-stage audio frequency amplifier based on a VT1 transistor of the KT315 type. At the input of the latter, through the capacitor C1, an audio signal is received from the microphone M1 of the "Pine" type. The amplifier load is made up of resistor R3 and a high-frequency generator connected between the plus of the power source and the collector of transistor VT1.
With signal amplification, the voltage at the collector of transistor VT1 changes. This signal modulates the amplitude of the signal of the carrier frequency of the transmitter generator, emitted by the antenna.
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