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

[Bill W4ZV]

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.
> 
> 

One more point.  The -3 dB bandwidth you are reporting is only 2.34 kHz on a
filter that is typically 2.9 kHz at the -6 dB points (mine and the one
measured by Elecraft below).  That seems very strange also.

Filter  BW(-6dB)     Shape Factor
 200     224             4.0
 250     370             2.1
 400     435             2.1
 500     565             3.1
1000    1063             1.6
1800    1913             1.5
2700    2910             2.9
2800    2888             1.6
6000    6125             1.5
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