OT: Site RF problems

[Ken G Kopp]

Our club's repeater is housed in a mountain-top building surrounded by
a chain link fence.  The site ... which is many years old ... has a number
of other stations, repeaters and several FM BC stations.

The "joints" where the chain link crosses each act like diodes in response
to the intense RF at the site. When the wind blows ... which is often ..
there
is lots of noise heard in all of the receivers at the site.

Yes, there is plastic coated chain link fencing available, but getting it
bought
and installed would be next to impossible.

This from a retired two-way radio tech who's worked at the site for 40
years.

73!



On Sat, Dec 16, 2017 at 8:54 AM, Jack Brindle <[hidden email]> wrote:

> I would ask this another way. What has changed recently. It certainly
> sounds like the transmitter is at fault, but similar situations can arise
> in conditions local to your station. Have you changed your antennas? Has
> something changed in your antennas? Something in the feedline or antenna
> with diode action could cause a similar issue. This could be a
> discontinuity in a connection (rust, corrosion) or something similar that
> is causing mixing of two or more signals. Just disconnecting your antennas
> and listening with a short whip may not be good enough to find this since
> you are still interacting with the local issue.
>
> You should take a 6m receiver out and listen to the band away from your
> station, so that you hear the transmitter without interaction of your
> antenna system. If you still hear the beacon problems, then the owner
> certainly needs to know they have an issue.
>
> This can be a rough issue to resolve, both on your end and the transmitter
> side. So many factors may be involved that the issue gets very complex
> (such as a diode action on his side, caused by an issue in a local
> commercial transmitter). Good luck resolving it, but be aware that there
> will be a resolution.
>
> - Jack, W6FB
>
>
> > On Dec 16, 2017, at 8:46 AM, stengrevics <[hidden email]>
> wrote:
> >
> > I have a beacon a couple of miles from me that has recently begun to
> splatter
> > all over the 6 meter band.  I've tried adjusting the noise blanker and
> that
> > helps somewhat.  I also tried adjusting the filter width, and shifting
> the
> > filter setting, with little result.
> >
> > Anyone have any experience dealing wit this issue?  Would appreciate any
> > suggestions for dealing with this.
> >
> > 73,
> >
> > John
> > WA1EAZ
> >
> >
> >
> > --
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