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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