Hi Bob I think you hit it on the head. Also I'm suspect of the NB cable
harness being draped above the 3rd mixer tube area. I only regret not having a
low end Spectrum Analyzer to end this design anomaly and improve this
situation. As suggested I need to disconnect the NB and short some NB socket
pins as I don't have the NB shorting plug.
I have many years RF experience in a factory setting doing just this for 200
watt VHF-UHF repeaters. It's not for the impatient and is a fascinating. The
way my R4C is operating in AM, SSB and CW receive modes.....each one has
different S-Meter calibration from each other.
Best 73
Bill KB9IV
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