[RFI] Another Solar Panel Interference Case

[Hare, Ed, W1RFI]

In the short run, there is not much to do, but we are engaging that industry at the committee level, to see what kind of support we can all give to each other.  If we can get them to join in the concerns about things like grow lights and to be able to press the FCC to enforce its existing rules.  

One grow light measured 58 dB over the FCC limits -- one device making as much noise as 650000 legal devices.

Ed



-----Original Message-----
From: RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> On Behalf Of Gary Peterson
Sent: Tuesday, April 5, 2022 12:07 PM
To: rfi at contesting.com
Subject: [RFI] Another Solar Panel Interference Case

I have worked in the technical end of radio broadcasting since 1965.  The stations that I worked for have lost listeners and a great deal of coverage, due to RFI.  I can’t begin to count of the number of times that I’ve been asked to call a listener who complained that they can no longer hear a station that I was responsible for.  This is happening with a station running 25 kW on the lower end of the band.

There are other reasons for the demise of AM broadcast radio, but RFI from power lines, computer networks, switching power supplies, CFL and LED light bulbs and other devices has been a significant contributor.

Probably the reason you don’t see much about it in the broadcast trade magazines is that there isn’t much of anything a station can do about it other than waste time playing whack-a-mole.

Gary  



I've only seen RFI mentioned in passing a few times in Radio World a broadcast magazine.  Doesn't seem to be an issue for broadcasters typically operating from 5,000 watts to 50,000 watts. 

If you think about it, it's not going to be much of an issue to local AM broadcasters who are using very strong local transmissions on ground wave to the receivers.  They may only lose fringe or rural area listeners, and only if those listeners get solar systems.  Compare that to amateur radio operators running only 100 watts (typical) or less or rarely up to 1,500watts (max) transmitting through the ionosphere once or multiple times with 40-70db or more of loss and requiring highly sensitive receivers to pick up the weak signals.  

Most AM broadcasters won't be affected much at all with minimal loss of listeners.  But Amateur Radio will be.  

73, de ed -K0iL
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