Posted by
Dave Hachadorian on
Feb 06, 2010; 3:45am
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884.html
Tonight I used a pair of K3's in the Sprint practice. Several
times I had a pileup of four or five loud stations calling me.
With AGC turned on, they were all mushed together, and I couldn't
copy any of them.
AGC settings:
dcy soft
hld 0.2
pls nor
slp 000
thr 008
f 200
s 020
I tried both fast and slow agc. No joy.
So I turned the AGC OFF. Now this introduces another problem -
the very low threshold of the AF Limiter. The AF limiter, even at
its highest setting of 030 introduces gross distortion on loud
signals. This is even worse than the mushy AGC.
So I transfer the headphones to the speaker output, so I can
reduce the AF gain setting in an attempt to get away from the
raucous AF limiter. This works for a while, until finally one
loud signal blows out the K3's audio amplifier. This is the
second time that has happened to me. I guess I'm a slow learner
on that issue.
Something really needs to be done here. My suggestions would to
raise the agc threshold further, and increase the slope of the
agc line (that would mean a slp setting of less than zero). The
AF limiter threshold also needs to be raised, and the AF speaker
output needs better protection.
Dave Hachadorian, K6LL
Yuma, AZ
.
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