Ahha, re my previous comment. I see that you have removed the NB-4 and there is no change. I withdraw my comment.
Best regards JB From: [email protected] [mailto:[email protected]] On Behalf Of Bill & Becky Sent: Thursday, 12 July 2012 9:21 AM To: [email protected] Subject: [Drakelist] R4C BFO Leakage 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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