VHF FM receiver on the KXA058 chip. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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VHF FM receiver on the KXA058 chip. 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 VHF FM receiver is easy to set up and manufacture. The basis is m / s KXA058, which contains in its composition a heterodyne, a mixer, an amplifier, a detector.

VHF FM receiver on the KXA058 chip

The sensitivity of the receiver from the antenna input is about 5 μV/m at a signal-to-noise ratio of 26 dB. The local oscillator frequency is determined by the parameters of the loop L1, VD1 and the capacitor inside m / s.

Parts and interchangeability: VT1 - KT3128, KT361; VT2 - KT3102; VD1 - KV109, KV122, KV123.

L1 - frameless, wound on a mandrel with a diameter of 3,5 mm, for the range of 68-80 MHz - 7 turns of PEV wire 0,4 mm; for the range of 80-108 MHz - 3 turns of PEV wire 0,4 mm.

If it is intended to use a receiver with one radio microphone, then the elements VD1, R7, R8 can be excluded from the circuit, and a tuning capacitor 1-4 pF is connected in parallel with the L30 coil, which will cover the entire required range.

Author: L. Bogdanov

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