I have the 2.0 and 2.8 filters installed; I seldom
get below 2.2-2.4 though but I'm not a contester.
Was watching 20 SSB on my P3 a while ago. You
could sure tell something changed at around
midnight Zulu!
73, Phil w7ox
On 3/30/14, 1:30 PM, Dave Hachadorian wrote:
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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