[aprssig] FYI: : Solar Ham Radio Interference

Jim Sanford wb4gcs at wb4gcs.org
Sun Nov 20 12:20:46 CST 2016


I have nearly completely gone to LED.  I find that lights with CREE 
devices in them are pretty quiet.

73,Jim

wb4gcs at amsat.org



On 11/20/2016 11:37 AM, noskosteve at yahoo.com wrote:
> While this is a little OT, the LED transition is happening much faster 
> than residential solar PV and they are very good garbage generators. 
> Even if they pass Part 15 (individually), they'll be hundreds in your 
> neighborhood.
> I have an 8w desk lamp that generates more RF noise when it is off 
> than on (soft switched).
> Just sayin'.
>
> Regards, Steve Noskowicz K9DCI
> Science & Technical Advisor
> challengerillinois.org
> From my tablet.
>
> -------- Original Message --------
> From:KF4LVZ
> Sent:Fri, 18 Nov 2016 22:59:23 -0700
> To:aprssig at tapr.org
> Subject:Re: [aprssig] FW: Solar Ham Radio Interference
>
> You can't use string inverters on an array that receives partial shade
> otherwise your array efficiency will be lower.
>
> On 2016-11-18 17:11, Robert Bruninga wrote:
> > NEW ISSUE:
> >
> > Previously QST and my emails discussed the rise in the noise floor 
> from home
> > solar and my suggestions to avoid purchasing a system with 
> micro-invrters or
> > elecronic "optimizers" on every panel on the roof, and stick with the
> > wuieter or easier-to-fix all DC wiring and central inverters.
> >
> > THAT’S NOT ALL! It was pointed out at the ARISS meeting this weekend 
> that
> > one must also watch out for their NEIGHBORS! That is, if you want to 
> keep
> > your clean noise floor for your own hamming and your own solar, you must
> > also be vigilant of your surrounding neighbors.
> >
> > The time to make friends so you can guide their future investment is 
> NOW,
> > well in advance before they make an irreversible decision.
> >
> > Ill try to remember to go out and see how far the noise radiates 
> from some
> > of the other solar panels in my neighborhood. Although my DC system with
> > central inverters is much quieter, I should go out and see how far 
> beyond
> > these houses, the various system's interference can be detected.
> >
> > Bob, Wb4APR
> >
> > -----Original Message-----
> > From: Robert Bruninga [mailto:bruninga at usna.edu]
> > Sent: Sunday, October 23, 2016 12:55 PM
> > To: Amsat BB
> > Cc: bruninga at usna.edu
> > Subject: Solar Ham Radio Interference
> >
> > Not Satellite related, but people often ask about any RFI from my solar
> > arrays at home. Interest stems from an RFI issue in April QST and my 
> letter
> > in Sept 2016 QST.
> >
> > Well, FINALLY, the jury is in. For the first time since installing 
> solar, I
> > finally got all my full-sized dipoles up in the air again. And 
> listened with
> > the arrays on and off.
> >
> > Yes, I have inverter noise about 12 dB above the noise floor every 
> 38 kHz on
> > 80 meters,. But couldn't really find anything on 20 meters. I did 
> not do a
> > thorough search, but enough to finally say, "yes, there is some 
> noise..."
> >
> > I post this because my 16kw of arrays are conventional series string 
> arrays
> > and much quieter than the "optimizers" on every panel all over the roof
> > noted in the April QST article. I always thought my string array was 
> quiet,
> > but now I have some data noted above. This could easily be fixed 
> with some
> > clamp-on ferrites down in the basement on the wires going into the
> > inverters...
> >
> > But for my rare HF operating, the solar AC disconnect switch is 
> about 3 feet
> > from the kitchen door. Easy enough to pull if I want HF silence. I could
> > also install a 40 amp disconnect relay from a switch in the shack... But
> > with my rare operating style, I'll probably do nothing. Of course it is
> > perfectly quiet at night ;-)
> >
> > It took me 6 years to get around to this test, so don't hold your breath
> > waiting for me to add some clamp-on filters to the inverter wires 
> and see
> > what that does.
> >
> > For those into solar, come join us on SolarDIY at yahoogroups.com Bob, 
> WB4APR
>
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