One of our tower operators has a strict rule about using only HDG or
stainless hardware on towers, else the rusting bolts turn into diodes when
exposed to higher power RF.
--
bp
part15sbs{at}gmail{dot}com
On Fri, Apr 19, 2019 at 5:40 PM Lewis Bergman <[email protected]>
wrote:
> Chuck is likely correct. Most likely bad connectors are the most likely
> cause. The situation can be made worse by a trashy tower. A tower with a
> lot of brackets or appurtances that are unused with loose brackets and such
> can increase the noise level on a tower significantly.
>
> On Fri, Apr 19, 2019, 7:15 PM Chuck McCown <[email protected]> wrote:
>
>> My guess is that the FM station has a problem with the antenna or
>> transmission line. Moisture throws off impedance somewhere and you have a
>> strong standing wave on the transmission line. Probably a bad connector.
>>
>> Sent from my iPhone
>>
>> > On Apr 19, 2019, at 5:52 PM, Matt Hoppes <
>> [email protected]> wrote:
>> >
>> > Looking to the wisdom of the AF group on this.
>> >
>> > I have some equipment on an FM tower. It’s a 9kw station around 150ft.
>> We are at 250ft with two sectors and a backhaul. Netonix switch in
>> shelter.
>> >
>> > Nothing else on the tower.
>> >
>> > Normally all is fine. When it rains or is very moist out (heavy heavy
>> fog) we start having major Ethernet negotiation issues. The ports will go
>> from 1Gig to 10F sometimes. Sometimes drop completely.
>> >
>> > I’ve got ferrite beads wrapped about 5 times top and bottom.
>> >
>> > Any further words of wisdom on what to try? I suspect some odd
>> grounding issue. But not sure how to track it down or isolate it.
>> > --
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>> > [email protected]
>> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
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