Thanks for all of the advice. 90% of the responses suggest it is a
relay; probably in my remote switch. I have 2 or 3 spare ports on my
remote switch so I guess it's time to climb the tower and move the 40m
coax to another port.
On 10/19/06, john@kk9a.com <john@kk9a.com> wrote:
> If it's only on 40m, it is probably a bad antenna relay. If it is on all
> bands it's probably an amplifier relay. I have experienced both problems
> and I now never mount an antenna relay up on the tower. Clean the 40m
> contact and see if it goes away. If not then check your coax connections.
>
> John KK9A
>
>
>
> To: towertalk@contesting.com
> Subject: [TowerTalk] Slow Attenuation of Incoming Signal
> From: "Kelly Johnson"
> Date: Thu, 19 Oct 2006 11:32:42 -0700
> 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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