A simple 144 MHz transmitter. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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A simple 144 MHz transmitter. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transmitters

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Simple 144 MHz transmitter

A simple radio transmitter is designed to operate in the 144-145 MHz band. Modulation - narrowband FM. Output power - 100 mW.

The contours L1-L4 are wound on mandrels with a diameter of 5 mm with PEL-0,6 wire.

L1 contains 6 turns.

L2-L4 contain 4 turns.

Chokes L5 and L6 are wound on ferrite tuning cores and have 4 turns of PEL-0,6 wire.

Transistors BC108 can be replaced with KT3102, and BCX19 - with 2T368, KT325. Microphone - electret.

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