SM2EKM:
I´m eagerly waiting for measurement figures on the K3.
Beats me why they can´t be presented, that I don´t understand
at all, after all it´s no rocket sience.
I'm surprised that so many roofing filters (and the K3 itself) have been
designed and offered for sale before the
AE5X:
I'm surprised that so many roofing filters (and the K3 itself) have been
designed and offered for sale before the specifications are known/posted.
Seems like the reverse order would have been more appropriate.
I was also concerned about so many filters until I realized
Elecraft
If my CAD computer design days don't fail me, I recall
8-pole type filters - had much steeper skirts, but
not so hot passbands, sort of ripply. Having already
forgotten the spec on group-delay (phase?) - I'll
have to look that up.
Fred, N3CSY
__
Passband ripple is more a function of the filter design parameters--was
it designed as a Chebyshev with 1 dB passband ripple, or a Butterworth
with a flat passband, or a Gaussian with a rounded passband, etc. And,
of course, those parameters govern also how fast the skirts roll off
and, of
I was also concerned about so many filters until I realized
Elecraft has actually leveraged the Inrad 7XX series of filters
offered for the 8.215 MHz IF of the FT-1000 family. I suspect
This is an interesting point! Makes me wonder about the 1.8kHz filter
for SSB contesting.
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