Transmitter 10 W at 27 MHz. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Transmitter 10 W at 27 MHz. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transmitters

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Transmitter 10 W at 27 MHz

Q1 KT904 on a 600 cm2 radiator.

L1 - diameter 15 mm on a ceramic frame. 5 turns of silver wire with a diameter of 1 mm, winding length - 20 mm, tap from the 2nd turn, counting from the grounded wire.

L3 - frameless, on a frame 8 mm, contains 11 turns of PEV-2 with a diameter of 1 mm.

L2 (choke) type DMM-2,4 (20 μH).

C1, C5, C6 - with air dielectric.

Transmitter 10 W at 27 MHz

In as a load, connect 2 lamps 6,3 V (0,22 A) connected in series to the antenna and the common wire. Connect the 5 V power supply. Disconnect the circuit L1, C1, instead, apply a signal from the VHF generator to the input.

Check the frequency of the output signal with a wavemeter (if it is not there or it is not like from a generator, adjust the capacitors and coils of the output circuit).

Connect circuit L1, C1 and increase the supply voltage. Auto-generation should already occur at 5 V (if it does not occur, move the emitter along the coil by 0.5 ... 2 turns) - current 250 mA. Do not raise the voltage above 20V (current 750 mA, power 8...10 W).

Tune all circuits by checking the frequency with a wavemeter. When mounting (hinged, directly on the radiator), the leads of the parts should be as short as possible, capacitors with the appropriate TKE should be used, the coils should be tightly wound. Only then will you get good frequency stability, otherwise it will "float" up to 500 Hz. The frequency modulator is tuned by selecting R1 when the voltage at the Q1 collector becomes equal to half the supply voltage. It may also be necessary to connect point A to part of the turns L1.

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