Improve FM radio reception. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Improve FM radio reception. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / VHF antennas

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Television video cards of the Video Wonder Pro II v 2 series and similar ones, containing, in addition to a TV tuner, also a VHF FM receiver, are equipped with a simple indoor antenna. If you use this antenna, you can improve reception of weak FM signals using the method described here. The main source of interference to radio reception, which manifests itself in the form of an increased noise level, is the computer itself, and the interference penetration channel is an unshielded two-wire reduction cable with an unbalanced connection to the card.

Improve FM radio reception. Refinement of indoor FM antenna

Take two ferrite rings, with an inner diameter larger than the size of the antenna plug, pass a drop line through them, making 5-6 turns of the line evenly placing them around the circumference of the rings. One ring should be placed at the bifurcation of the line to the vibrators, and the other as close as possible to the connection plug. The magnetic permeability of the rings is not critical. I used 2000nm. As a result of the refinement, the drop line is symmetrical and interference with the reception of weak signals is significantly weakened, even when receiving with the cover of the system unit removed. You can limit yourself to one ring, the bottom one.

By the way, maybe someone does not know that this receiver receives FM signals from 66 (!) to 108 MHz, that is, the Soviet + Japanese + FM bands.

Publication: shustikov.by.ru

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