Re: K-3 Roofing filter comment
Posted by
Dave Hachadorian on
Jul 12, 2011; 8:21pm
URL: http://elecraft.85.s1.nabble.com/K-3-Roofing-filter-comment-tp6576237p6576660.html
> The DSP forms the
>ultimate filter, and does have nearly vertical slope.
I think one of the Elecraft folks stated on the reflector that
the -60dB BW of the DSP is (-6dB BW + 300Hz).
So at DSP BW = 2800 Hz,
BW60 = 3100 Hz.
Equivalent shape factor would be 3100/2800 = 1.1
That's pretty doggone steep.
Any reasonable amplitude signal (not triggering hardware AGC)
over 1550 Hz off center would be down 60 dB.
I think I've got that straight. Comments welcome.
Dave Hachadorian, K6LL
Big Bear Lake, CA
.
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