Paul -
Yes, narrow filters limit the noise bandwidth, PLUS they tend to stretch
and delay noise pulses causing them to not match up with blanking pulses
or be too long to be effectively blanked. This is one design decision
for the four or six pole (can't recall which at the moment) filter that
Drake used. More poles, (sections,) in a filter increase the group
delay (stretching) of especially pulse type signals.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Paul Christensen wrote:
I'm planning on adding a GUF-1 filter to my R-4C receiver. Any
comments as to the selection of either the 6 kHz or 8 kHz filter
version of the GUF-1? One comment on the web indicated that the 4NB is
more effective with the 8 kHz GUF-1. Perhaps it's a decision that
balances NB effectiveness versus narrower Rx bandwidth.
Paul, W9AC
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