VHF radio receiver with FM in the frequency range 64 ... 108 MHz and low-voltage power supply. Scheme, description

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VHF radio receiver with FM in the frequency range 64 ... 108 MHz and low-voltage power supply. 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 operates in the range of 64-108 MHz and has a sensitivity of at least 5 μV/m. The nominal supply voltage is 3 V. The entire high-frequency path, including the FM detector, UHF and local oscillator, is assembled on one specialized DA1 chip of the K174XA34 type. This microcircuit is a UHF mixer, local oscillator, UPCH, limiting amplifier, FM detector, noise reduction and frequency deviation compression systems, which allows the use of a low intermediate frequency - 60-80 kHz.

VHF radio receiver with FM in the frequency range 64 ... 108 MHz and low-voltage power supply

The signal from the antenna is fed to the UHF through the capacitor C1. The local oscillator tuning frequency is determined by the elements L1, C4, C5, VD1. Tuning at the station is carried out by resistor R1, which changes the voltage on the VD1 varicap type KB 109.

Active RC filters on operational amplifiers are used as FPF, the external elements of which are capacitors C6, C8, C9, C11, C 12 and C13. The audio frequency signal through the capacitor C16 is fed to the volume control - resistor R3.

The UZCH of the receiver can be anything, including on the K174XA10 chip. Fixed resistors type MLT-0,125. Coil L1 - frameless, with an inner diameter of 3 mm. It has 7 turns of PEV.0,31 wire. The setting consists in laying the range by adjusting the capacitor C4.

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