That's really interesting Paul.  Were you also using very narrow passband and 
other rx eq filtering?  Was he sending QRS?

David 
G3UNA

> The low frequency issue reported here is primarily related to CW, not SSB. 
> As an example of its importance, I worked a 4S7 station last night on 40m. 
> As his gray-line was shifting away, his already weak signal was fading even 
> further.  Using F/W 3.25, I was able to copy him with an extremely low pitch 
> of about 50 Hz.   The use of extremely low pitch for marginal CW copy is 
> pretty well known among top DXers. There's absolutely no way I would have 
> worked he 4S7 using F/W 3.27.
> 
> Paul, W9AC 
> 
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