In solar (PV) systems, Inverters, Charge Controllers and associated cabling are 
the prime suspects.  There is a lot of info on the internet, and some of it is 
pretty good.

Shielding can be effective, but the real problem is that the FCC has seen fit 
to exempt solar systems from most Part 15 requirements.

Good luck!

73
Lyn, WØLEN



-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Brian Hunt
Sent: Monday, April 18, 2022 7:34 PM
To: [email protected]
Subject: Re: [Elecraft] Interference on 17M

Potentially a solar panel. Any new installations nearby?  Does it go away after 
sunset?

I have an S9 noise signal on about 14036 with spurs on either side coming from 
a new solar installation about 200 yards away. Broad but very stable. Makes 
that section of the band tough to use. I think it’s Solar Edge but haven’t 
confirmed it.  QTH is Northern California. 

73,
Brian, K0DTJ

> On Apr 18, 2022, at 07:30, Ron Bell via Elecraft <[email protected]> 
> wrote:
> 
> Does anyone know the source of interference in 17M, starts at 18.138, peaks
> 18.147 and second peak at 18.158, sounds like very rapid buzz or popping
> sound?  Makes upper 30 Khz of 17M useless.  Over the Horizon radar?
> 
> 
> 
> Happy international amateur radio day.
> 
> 
> 
> 
> 
> Ron
> 
> AF1Q / DA1YS
> 
> 
> 
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