I've had the same symptoms. It was a dirty connection on a switch in the
antenna tuner.
Good luck.
Forrest
K7OCR
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Kelly Johnson
Sent: Thursday, October 19, 2006 11:33 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Slow Attenuation of Incoming Signal
I've been noticing a strange phenomena that I'm hoping someone can help
explain.
I'll be sitting in front of the rig tuning the band and listening when all
of a sudden the background noise level starts to drop and signals start to
drop in strength. After a couple of seconds signals are severely
attenuated. It's as if there is a variable attenuator in my coax line and
someone turned it from 0dB to 50dB. A single tap on the CW key brings it
right back to normal once again. It'll stay normal for minutes or even
hours before doing it again. A single "dit" from the key always brings it
back to life. I've never heard it do this on any band except 40m which
leads me to believe it is my 40m antenna, but I'm not sure about that. I
run a common feedline all the way up the tower to a remote switchbox which
switches between my SteppIR and my 2 element 40m yagi. If it's limited to
40m then it's either in my rig OR between the switchbox and the 40m yagi.
Anyone have an idea?
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