VHF radio receiver. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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VHF radio. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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The receiver is designed to operate in the VHF range and is a super-regenerator.

The optimal detector mode is chosen by changing the resistance of the resistor R5. A variable resistor R4 sets a certain frequency of super-regeneration. Increasing it improves the quality of the low-frequency signal, but the gain of the cascade drops.

(click to enlarge)

The pairing of the tunable circuits is carried out using trimmer capacitors C3, C9.

The main consideration in the design of the receiver should be given to shielding, otherwise the radiation of the detector may cause unwanted interference.

All inductors are wound on frames with a diameter of 8 mm. Coil L1 has 2 turns of PEV 0,5 wire wound over coil L2, coil L2 contains 5 turns, L3 - 3 turns, L4 - 3 turns, L5 - 7 turns of silver-plated copper wire with a diameter of 0,8 mm. Throttle Dr1 - 10 ins.

Literature

"Funkamateur", 1969, No. 2

Publication: N. Bolshakov, rf.atnn.ru

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