Keep in mind that a broadcaster is not legally responsible for intermodulation
that is not occurring in its transmitter or in nearby equipment it owns and
operates. If a "rusty bolt" on nearby electrical lines is creating harmonics or
intermodulation, the broadcaster cannot control that. If the rusty bolt is on
its tower, or the fence on the broadcasters property, or being generated by
something on its site, it is responsible.
I find that most intermod occurs either very close to one of the involved
transmitters or very close to the affected receiver.
Ed
-----Original Message-----
From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> On Behalf Of Jim Brown
Sent: Wednesday, October 27, 2021 6:39 PM
To: rfi@contesting.com
Subject: Re: [RFI] Splatter from AM Radio Station WNTS Indianapolis
On 10/27/2021 3:09 PM, Gary Peterson wrote:
> Neither intermod product can be nulled toward either transmitter site with
> the Faraday shielded loop antenna incorporated into the field intensity
> meter.
Yep, that pretty much rules out either of the plants as part of the problem.
The intermod appears to be coming from multiple, multiple sources.
Probably, utility lines, mostly.
Several years ago, AC0C alerted us to the fact that MOVs have been widely used
on distribution lines for a while. Both a potential site for mixing, and also a
source of arcing as they degrade. After Jeff posted the photo, I started
identifying them around here.
73, Jim K9YC
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