[RFI] Splatter from AM Radio Station WNTS Indianapolis

[Hare, Ed, W1RFI]

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 at contesting.com> On Behalf Of Jim Brown
Sent: Wednesday, October 27, 2021 6:39 PM
To: rfi at 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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