This is a variable-bandwidth filter built with two varactors (varicaps). It is a tunable LC bandpass filter that provides selectivity of up to 20 dB at the edges of the 80 m band when tuned to the middle of the band. Varactors are used instead of capacitors.
This page is a utility for simulating полосовой фильтр на варикапе online with specified initial values.










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