On 3/25/2020 11:40 AM, Jim McCook wrote:
Jim, thanks for the ideas. I'll look through that NCJ article again.
Addressing a possible common mode problem is a good idea. That makes
perfect sense. Paul at ARRL thought so, too. My real challenge will be
getting this particular neighbor to cooperate, since he's basically
hostile. Paul also had a suggestion which was to look at EMI filters
for this purpose at DX Engineering:
https://www.dxengineering.com/parts/dxe-iso-plus-10
Hi Jim,
I suspect that these boxes contain something approximating my
recommendations, but who knows for what frequency range. Their virtue
for you is that they are a simple "plug and play" approach that may be
least likely to cause problems with your neighbor.
--which could be a solution, except for a the POE cable that powers a
second similar switch in his office. I have no real concern for 10 or
15m now, but this is a new, rebuilt house, so I want to nip this in the
bud. The longer I ignore the problem the harder it will be to deal with
this guy.
An important point that RFI guru Henry Ott made to me many years ago is
that both ends of a data circuit are potential RFI sources, so chokes
are likely required at both ends of each cable. Also, I've seen very
nasty RFI produced by POE.
73, Jim K9YC
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