Hi Dave,
Your link for the presentation was in a separate email... Feel free to
pass it around...
The problem with your RFI solution is you had an inside person... While
it was good that you did, most folks don't, so the enforcement becomes
spotty... I would like the FCC to take a far more active rile in this
process, but alas, I suspect they won't as we are not on their radar...
I used to deal directly with the FCC, and had good results, but of late,
I intend to vector any RFI issues through the ARRL, as I try and be in
compliance with their wishes of being the point group for this sort of
thing...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 11/24/19 10:06 AM, David Eckhardt wrote:
have held off writing this since the subject recently came up. However,
it is time to relate a complaint that we as a club (Northern Colorado
Amateur Radio Club, NCARC) filed some six or seven years ago that worked
out quite amiably in our favor. The repeater was to support and event a
couple of months in the future for which the county required comm.
support. The key was to have a known and friendly contact within the
FCC office in Denver, Colorado.
Problem: One of our repeaters was being 'jammed' by a large and
aggressive (from an RFI standpoint) LED matrix sign. We found the
culprit by driving up and down South College Ave in Fort Collins with an
antenna and a portable spectrum analyzer (before the affordable SDR's
hit the market). When we felt we were close, we took the portable
spectrum analyzer on foot with a small antenna, and ultimately, a very
short E-Field probe. The RFI was so bad it could be detected some 15
miles distant and 'through' a couple of high granite 'hills' of which
Colorado has many. It was BAD!
Once the problem sign was located, we introduced ourselves inside the
business and asked them to turn off the sign to verify that was, indeed,
the source. Sign turned off, RFI ceased. We advised the business of
the problem and the FCC rules regarding such interference. We then
determined the sign installer since the business had no engineering
staff - they were a furniture store.
The sign installer was contacted. Their response was to have a "ground"
installed at the sign. Sound familiar??!!
Installation of the "ground" did nothing to weaken the RFI. The
installer assumed they could do nothing else and washed their hands to
the situation.
The club put together a painfully word smithed letter supported with
measured data and sent it to both the business and the sign installer.
The business, once again, defaulted to the sign installer.
The installer blew off the first letter. We contacted them on the
phone, again. They indicated they had installed a "ground" and could
offer no further service in alleviating the problem.
We sent a second letter. Same responses.
After contacting our 'inside person' at the FCC office in Denver,
Colorado, and explaining the situation and what we had done previously,
a third and final letter was sent out to the business, the sign
installer, and the FCC office in Denver (they knew the letter was coming
and were aware of our previous efforts).
FCC, Denver, issued a letter to the sign installer giving them 30-days
to correct the problem. The first FCC letter was blown off. The second
letter from FCC, Denver, was quite specific and offered to levy fines
per FCC rules of causing interference to a properly licensed service.
That finally got some action, but it took a final personal visit from
the Denver office to 'instill some respect" for a government agency, the
FCC. The sign installer got the sign designer involved - engineering -
and fixed the problem, at least alleviated the RFI, to a tolerable level.
Paramount to this success was the FCC contact in the Denver office. It
took a lot of work and word sleuthing of the letters. Fortunately, we
had someone in the club who had a relationship with the Denver office as
well.
One of very few success stories.
Please have a read of the last paragraph of my QRZ page for some
personal experiences gained over some 35+ years of doing RFI and
regulatory engineering/design and testing.
---
*Dave - WØLEV
*
**
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