Is the NB-4 Noise Blanker installed? If so remove the NB from the R4-C and install the jumper socket and see if the effect remains.
Chances are the NB is the issue and will need to be realigned and the NB gain reset. JB From: [email protected] [mailto:[email protected]] On Behalf Of Bill & Becky Sent: Monday, 2 July 2012 12:24 PM To: [email protected] Subject: [Drakelist] R4C Questions Hi Group I recently obtained a Sherwood upgraded R4C (SN 22xxx), the only Sherwood upgrade it doesn't have is the 2K Upper & Lower SSB filters. It performs very well but it has one oddity. When in SSB mode and the PBT is adjusted Upper & Lower end of travel it varies the S-Meter from S6 middle center PBT to S1 either PBT endpoint. On CW using the 1.5Khz, 500Hz or 250Hz it works like it should or what I'm accustom to. I've corrected many small problems by treating grounds and filter sockets, tube sockets from the topside........bottom side next. It just seems like I'm getting allot of white noise or bleed through from somewhere to cause the SSB mode oddity. Question? How can it tell if this has the T7C version xfrmer?? These Sherwood upgrades were done 20+ yrs ago and this nice condition R4C has sat unused for many years. Perhaps all is typical as I don't have another to compare to. Best 73 Bill KB9IV
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