Miniature tunnel diode radio transmitter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transmitters
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Among the large family of radio transmitters, one can single out those devices that have a simple circuit design, a small number of parts, and at the same time have fairly good characteristics.
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The basis of this device is a high-frequency tunnel diode oscillator circuit. The current drawn by the generator from the power supply is approximately 15 mA and depends on the type of tunnel diode. The type of tunnel diode can be selected, at the discretion of the radio amateur, with a current consumption of not more than 10-15 mA (for example, AI201A diode). The generator remains operational at a power supply voltage of 1 V and higher with an appropriate selection of the operating point by resistor R2.
The inductor Dr1 is wound on a resistor MLT 0,25 with a PEV 0,1 wire and contains 200-300 turns. To prevent the wire from jumping off the resistor, it is periodically lubricated with Moment glue, BF-2 or others. The inductance of the inductor should be 100-200 uH. The throttle may be factory-made. The coil of the oscillatory circuit L1 is made without a frame and contains 7 turns of PEV wire 1,0 mm.
Coil diameter 8 mm, winding length 13 mm. The communication coil L2, like L1, is frameless, wound with a PEV wire of 0,35 mm, 3 turns, coil diameter 2,5 mm, winding length - 4 mm. Coil L2 is located inside the coil of the oscillating circuit L1. Setting up the transmitter comes down to setting the operating point of the tunnel diode by rotating the trimmer resistor R2 until stable generation appears and adjusting the oscillation frequency with capacitor C4.
An antenna is a piece of mounting wire about a quarter wavelength long. The depth of modulation can be changed by selecting the resistance of the resistor R1. The signal from this transmitter can be received on a television receiver.
See other articles Section Transmitters.
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