Рет қаралды 3,346
I built my first 2m bandpass filter for Quansheng k5(8), and during testing noticed that it receives weak off band (air-band) signal with filter better than without filter even when this filter attenuates air-band signals by -14db (filter was designed to pass 142-148MHz band and filter out everything else).
Probably FM broadcast stations overloads frontend so much, that even bad filter makes radio work better.
When I tuned my IC-7100 to that air-band station it receives better without filter (s5 vs s1) as it should.