TVI Filters: Reducing Television Interference from Ham Radio
Find schematics, construction guides, and technical information for building and implementing TVI filters to mitigate interference.
Television Interference, or TVI, occurs when a ham radio station's transmissions disrupt a neighbor's television reception. This often happens when strong RF signals from an amateur radio transceiver overload the front end of a TV, especially older analog sets or poorly shielded modern ones. Operators frequently encounter TVI issues on HF bands, but VHF and UHF operations can also cause problems, particularly with local broadcast channels.
To mitigate TVI, hams often build or deploy various types of filters. This category provides schematics and construction details for homebrew low-pass filters, which reduce harmonics from the amateur station, and high-pass filters, which block strong HF signals from entering the TV. You will also find designs for specific notch filters, like those for 2m and 70cm, and practical guides on characterizing commercial units such as the Bencher YA-1.
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Testing a Bencher YA-1 low-pass TVI filter with a spectrum analyzer with tracking generator. -
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The TVI filters described in this page worked very well in curing a TVI problem on 2m abd 70cm