VHF FM receiver on the K174XA34 chip. Scheme, description

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VHF FM receiver on the K174XA34 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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VHF FM receiver on the K174XA34 chip

Parameters

Frequency range: 88-108 MHz
Sensitivity: 6 uV
Current consumption: 10mA
Minimum supply voltage: 3,3V

Details

The coil is frameless, the winding diameter is 4 mm, 8 turns of wire with a diameter of 0,35 mm.

Setting

The exact setting of the range is performed by stretching-compressing the turns of the L coil and selecting connections to it with a capacitance of 24 pF. A stable power supply and observance of the rules for installing VHF equipment are strongly recommended. If all these rules are followed, it works perfectly (even when the computer is turned on).

In the diagram, the details are for the 69-88 MHz range. For the range of 88-108 MHz, you need to remove the 430K resistor, and put the output of the multi-turn tuning resistor on the case and slightly push the coil turns.

Publication: cxem.net

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