[Elecraft] K3 SSB - Is the 5 pole filter good enough

[Barry N1EU]

Stewart G3RXQ wrote:
> 
> On USB the trace was substantially flat with the -3dB points at
> 430Hz and 2.77KHz. Not too bad and could probably be improved by
> moving the carrier offset frequency.
> 
> On LSB, however the trace was far from flat having a slope from
> audio LF to HF of about 6dB. Not very good at all...
> 
> I wonder if others have plotted their 5 pole filters.
> 

I have plotted my 2.7Khz filter in both USB/LSB and am not seeing the slope
that you're seeing.  I'm able to adjust the center freq so that USB/LSB
sound virtually identical.

73,
Barry N1EU
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