VERY interesting. I have a VHF repeater that is doing the
same thing (intermittent bouts of noise that sounds like a
bad connection / micro-arc). I've been blaming it on the
very old Phelps Dodge PD220 antenna... which it may well be
in my case.
What I am curious about here is that in both cases (the
originator of this thread and my mystery system) it is fine
into a dummy load, only acting up on the antenna. Do you
still suspect the duplexer? Perhaps slightly different
impedance of the antenna vs. the dummy load is enough to
cause the problem to occur?
I have a replacement for the antenna, but if that doesn't
cure it I will have to start looking for new suspects!
Paul N1BUG
On Tuesday 23 August 2005 12:20 pm, skipp025 wrote:
> Duplexer generated possibly...
>
> Reads like arc type pitting inside the duplexer. Take a
> slow speed drill and run the duplexer tune shafts up and
> down through their range a number of times. Hopefully
> the plunger finger stock will knock off or polish
> off/down the pit/arc spot enough. Don't know if Wacom
> uses threaded tune shafts like Telewave and others...
> but you get the idea.
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