A few weeks back I wrote about PBT levels in SSB/AM modes. It would change
S-Meter levels depending on adjustment of the PBT. I ruled out the 4NB board
by removing it......no change.
However when I removed the bottom cover almost 6 S-Units of PB feedthrough were
reduced and performance was enhanced with less white noise. Interesting to know
the interference is being conducted by the metal bottom cover to key area's of
the bottom chassis. Next I will attempt adding metal shields to isolate
internal RF from conducting to nearby by circuits that are prone.
Best 73
Bill KB9IV
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