VHF FM receiver on the KXA058 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception
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VHF FM receiver is easy to set up and manufacture. The basis is m / s KXA058, which contains a heterodyne, a mixer, an amplifier, a detector.
(click to enlarge)
The sensitivity of the receiver from the antenna input is about 5 μV/m at a signal-to-noise ratio of 26 dB. The frequency of the local oscillator is determined by the parameters of the circuit 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 you intend to use a receiver with one radio microphone, then you can exclude the elements VD1, R7, R8 from the circuit, and in parallel with the L1 coil, turn on a tuning capacitor 4-30 pF, which will cover the entire required range.
Author: L. Bogdanov; Publication: N. Bolshakov, rf.atnn.ru
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