On 3/18/2013 8:36 PM, Don Wilhelm wrote:
> This is reminiscent of the old days of TVI.
> One of the guidelines back then was - avoid making any changes to that
> neighbor's system by yourself. If you do, you may be "responsible" for
> any future strange "happenings".
> Your position should be to offer to assist a qualified technician in
> isolating and correcting any deficiencies by providing periods of
> operating to test the results of any repairs.
Don's reply is right on target today as it was 50 years ago when I first
got into the "RFI-chasing" business. I give that advice to all hams who
come to me on ARRL-referral and also remind them (us?) to ensure that
the station and its signals meet FCC requirements.
In my experience, the type of TVI/RFI/Audio rectification being
described is not due to a "dirty signal" but is a result of unwanted
reaction to the actual ("main") signal itself and the "cure" lies with
the affected installation, not with the radio station.. This is one of
the hardest things to sell to the affected party.
Although we operate "in the public interest", too many hams want to be
"Mister Fixit" which with today's state of consumer electronics is not
only a dangerous thing to attempt in terms of future liability but also
a hopeless task. How does one put a toroid around a circuit board
trace? <G>
My 2 cents' worth.
73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
ARRL Volunteer Counsel
ARRL Volunteer Consulting Engineer
(FCC San Francisco District Director - retired)
VP - General Counsel and Engineering Manager
CSI Telecommunications, Inc. - Consulting Engineers
San Francisco, CA - Beaverton, OR
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