I was in the WPX SSB contest this weekend, and wanted to try
using just the 2.7 roofing filter, using only DSP to narrow the
response below that. I previously have had the feeling that the
1.8 roofer was degrading speech intelligibility. The WPX is a
QRM-fest of the first order. Everybody can work everybody, so
the whole world is doing their own thing all the time. 15 meters
was particularly bad, with almost nobody having a clear channel.
Using only the 2.7 filter, I never experienced a case of
adjacent-signal AGC pumping, or any other negative issue during
the contest. I think if an SSB signal is so close to you that it
is pumping your agc through the 2.7 filter, the frequency is
hopelessly splattered anyway, and you'd best be moving on. I did
narrow the DSP down by using HI CUT, and usually ran it at
LOW=0.15 and HIGH=2.25.
I could be persuaded to part with my pair of 1.8 filters, if
someone is interested in them.
Dave Hachadorian, K6LL
Yuma, AZ
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