On 03/04/2013 11:55 AM, Dale wrote:
Paul, that is most unfortunate about the situation at your County EC
person. Separation distance is an effective tool to reduce the
effects of unwanted emissions on victim receivers. If that person
can not move the antennas and LAN further apart, then the few
remaining choices, other than turning off the LAN, would include
forcing the LAN to run only in 10 Base-T (if that is possible) or
shielding the equipment associated with the LAN. Question: Do you
know if the problem exists because of radiation from the cables, or
could it be both cables and hardware?
Dale, I investigated this morning. It is very hard to determine
whether cables or devices are doing most of the radiating, but the
entire network has the 147.210 carrier present to varying degrees. I
was able to identify two cables which seem to have particularly high
levels compared to the rest of the system. It isn't as bad as I was
expecting. If we could reduce the interference by 10 dB I think that
would be enough to completely eliminate the issue. Forcing the LAN
to operate at 10 Base-T speeds *might* be acceptable, but I will
have to enlist the aid of an IT person to find out if that is
possible and how to do it.
73
--
Paul Kelley, N1BUG
RFI Committee chair,
Piscataquis Amateur Radio Club
http://www.k1pq.org
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