[CQ-Contest] SO2R filtering help
Dan
w8car at buckeye-express.com
Tue Jul 23 17:06:37 EDT 2019
I am baffled by a problem that I’m having setting up to do interference free SO2R operating running LP. I’ve tried stubs and they have no effect on harmonics. I have good W3NQN style bandpass filters and THEY don’t seem to knock down harmonics. I know the stubs/filters are working as they greatly attenuate received signals if I put them on the band of harmonic attenuation. (40 meter filter in line while receiving on on 20 ) I’m using a K3 an FT1000MP. Filtering and stubs have no effect on either radio.
I have read that there could be something other than the rigs creating harmonics. IE corrosion, wall warts, grounding problems. What I need are ideas on how to track these buggers if indeed this is the problem.
Thanks in advance
Dan W8CAR
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