Have you been able to remove the NB-4 and bypass it with the jumper plug as yet? I have experienced this problem and I have found the NB-4 to be the culprit. You may be embarking on a process to eliminate symptoms rather than fixing the problem.
JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Bill & Becky Sent: Thursday, 12 July 2012 9:21 AM To: drakelist@zerobeat.net 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
_______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
