You might want to reach out to David, KK6US. He installed a Generac solar
system, and then worked with his local installers and Generac engineers for
well over a year to solve the RFI problems. They finally delivered an
updated and redesigned inverter that included some RFI protection, but that
was within the last few months, as I recall.
David’s info should be good on QRZ.
73,
Frank N6OI
On Thu, Aug 1, 2024 at 3:02 PM <rfi-request@contesting.com> wrote:
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> Today's Topics:
>
> 1. Re: New RFI Source (Jim Brown)
> 2. Re: New RFI Source (K9MA)
> 3. Re: New RFI Source (Michael Carter)
> 4. Re: New RFI Source (K9MA)
> 5. Re: New RFI Source (Don Kirk)
>
>
>
> ---------- Forwarded message ----------
> From: Jim Brown <jim@audiosystemsgroup.com>
> To: rfi@contesting.com
> Cc:
> Bcc:
> Date: Thu, 1 Aug 2024 13:50:36 -0700
> Subject: Re: [RFI] New RFI Source
> On 8/1/2024 12:45 PM, K9MA wrote:
> > I'll try to get the installer and Generac to fix the problem. Has anyone
> > had any experience with Generac?
>
> Great sleuthing, Scott. Suggest that you talk to Ed Hare and/or W1EMI
> first.
>
> 73, Jim K9YC
>
>
>
>
>
> ---------- Forwarded message ----------
> From: K9MA <k9ma@sdellington.us>
> To: rfi@contesting.com
> Cc:
> Bcc:
> Date: Thu, 1 Aug 2024 15:53:38 -0500
> Subject: Re: [RFI] New RFI Source
> Will do!
>
> 73,
> Scott K9MA
>
> On 8/1/2024 3:50 PM, Jim Brown wrote:
> > On 8/1/2024 12:45 PM, K9MA wrote:
> >> I'll try to get the installer and Generac to fix the problem. Has
> >> anyone had any experience with Generac?
> >
> > Great sleuthing, Scott. Suggest that you talk to Ed Hare and/or W1EMI
> > first.
> >
> > 73, Jim K9YC
> >
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
>
>
> --
> Scott K9MA
>
> k9ma@sdellington.us
>
>
>
>
> ---------- Forwarded message ----------
> From: Michael Carter <Mike.Carter@unh.edu>
> To: "rfi@contesting.com" <rfi@contesting.com>, "jim@audiosystemsgroup.com"
> <jim@audiosystemsgroup.com>
> Cc:
> Bcc:
> Date: Thu, 1 Aug 2024 21:01:46 +0000
> Subject: Re: [RFI] New RFI Source
> I'll add to Jim's congratulations, Scott-
> well done!
>
> Will have to look into the Generac system
> specifics.....I'm not aware of any of those
> installations near me - the dominant
> installer in southern NH and southern ME
> is Revision Energy, and I think they use
> mainly the Enphase product line.
>
> 73,
> Mike, K8CN
> ________________________________
> From: RFI <rfi-bounces+mike.carter=unh.edu@contesting.com> on behalf of
> Jim Brown <jim@audiosystemsgroup.com>
> Sent: Thursday, August 1, 2024 4:50 PM
> To: rfi@contesting.com <rfi@contesting.com>
> Subject: Re: [RFI] New RFI Source
>
> CAUTION: This email originated from outside of the University System. Do
> not click links or open attachments unless you recognize the sender and
> know the content is safe.
>
>
> On 8/1/2024 12:45 PM, K9MA wrote:
> > I'll try to get the installer and Generac to fix the problem. Has anyone
> > had any experience with Generac?
>
> Great sleuthing, Scott. Suggest that you talk to Ed Hare and/or W1EMI
> first.
>
> 73, Jim K9YC
>
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
>
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>
>
>
>
> ---------- Forwarded message ----------
> From: K9MA <k9ma@sdellington.us>
> To: rfi@contesting.com
> Cc:
> Bcc:
> Date: Thu, 1 Aug 2024 16:07:28 -0500
> Subject: Re: [RFI] New RFI Source
> Both my immediate neighbor and I have Enphase systems. I had single-turn
> ferrite cores put on all the leads of both, and I've detected absolutely
> no RFI from them. Whether the ferrites were necessary is unknown, but
> the single turn may not have had much effect at HF.
>
> 73,
>
> Scott K9MA
>
> On 8/1/2024 4:01 PM, Michael Carter via RFI wrote:
> > Will have to look into the Generac system
> > specifics.....I'm not aware of any of those
> > installations near me - the dominant
> > installer in southern NH and southern ME
> > is Revision Energy, and I think they use
> > mainly the Enphase product line.
>
>
>
> ---------- Forwarded message ----------
> From: Don Kirk <wd8dsb@gmail.com>
> To: K9MA <k9ma@sdellington.us>
> Cc: rfi@contesting.com
> Bcc:
> Date: Thu, 1 Aug 2024 17:08:49 -0400
> Subject: Re: [RFI] New RFI Source
> Hi Scott,
>
> Yep, it was a Generac system in our case at W9RE last year, and you
> definitely need to work with Steve at the ARRL as he has great contacts
> within Generac which greatly helped us. I prefer not to get into the
> details online regarding our resolution but it was almost too good to be
> true (the homeowner benefited greatly).
>
> I’ll e-mail you my phone number and I’ll fill you in on the details.
>
> Don wd8dsb
>
> On Thu, Aug 1, 2024 at 3:57 PM K9MA <k9ma@sdellington.us> wrote:
>
> > Source found. It's a Generac solar system 640 meters (0.4 miles) from my
> > tower. The homeowners were very cooperative, and switched the inverter
> > off for the test, which was conclusive. The location is almost exactly
> > on my 20m beam heading.
> >
> > It's a partly cloudy day here, so I suspect the variations in the signal
> > I'm seeing were due to solar power fluctuations.
> >
> > I'll try to get the installer and Generac to fix the problem. Has anyone
> > had any experience with Generac?
> >
> > 73,
> > Scott K9MA
> >
> >
> >
> >
> > On 8/1/2024 1:04 PM, K9MA wrote:
> > > Hi Mike,
> > >
> > > The other copies (harmonics of 78 kHz) show exactly the same
> > > structure. I hear the signal only on 20 meters, across the whole
> > > band. They certainly go beyond the band, but it's hard to tell how
> > > far due to antenna bandwidth. Looking at the whole band, I'm actually
> > > seeing harmonics of 39 kHz, though the 78 kHz harmonics are stronger.
> > >
> > > Looks like I'll be taking a walk this afternoon.
> > >
> > > 73,
> > > Scott K9MA
> > >
> > > On 7/31/2024 7:26 PM, Michael Carter wrote:
> > >> Scott, do the spectral copies at 78 kHz intervals
> > >> mimic the sideband structure shown in your K4
> > >> screen capture?
> > >>
> > >> Over what frequency range can you see the
> > >> spectral copies (limited by antenna bandwidth,
> > >> I suppose)?
> > >>
> > >> The120 Hz spaced fine spectral lines in the
> > >> main lobe suggest to me a 120 Hz square
> > >> wave modulating an underlying 'carrier' signal.
> > >> AC power line signal rectified
> > >> in the power supply for the device and coupled
> > >> into the 'clock' carrier and its harmonics?
> > >>
> > >> The more distant sidebands don't exhibit the
> > >> fine 120 Hz structure of the main lobe. That's
> > >> what's puzzling me.
> > >>
> > >> I'll be very interested to see what your DF'ing
> > >> leads to......
> > >>
> > >> 73,
> > >> Mike, K8CN
> > >>
> ------------------------------------------------------------------------
> > >> *From:* K9MA <k9ma@sdellington.us>
> > >> *Sent:* Wednesday, July 31, 2024 5:56 PM
> > >> *To:* Michael Carter <Mike.Carter@unh.edu>; rfi@contesting.com
> > >> <rfi@contesting.com>
> > >> *Subject:* Re: [RFI] New RFI Source
> > >> CAUTION: This email originated from outside of the University System.
> > >> Do not click links or open attachments unless you recognize the
> > >> sender and know the content is safe.
> > >>
> > >> The carriers within that main lobe appear to be 120 Hz apart, so
> > >> likely line related. They seem to vary in amplitude, but are very
> > >> stable in frequency.
> > >>
> > >> 73,
> > >> Scott K9MA
> > >>
> > >>
> > >> On 7/31/2024 4:28 PM, Michael Carter wrote:
> > >>> Hi Scott,
> > >>>
> > >>> The sidebands are not typical of any SMPS I've
> > >>> looked at spectrally. The fine spectral structure
> > >>> inside the main lobe suggest 60 Hz or 120 Hz
> > >>> modulation of the nominal 'carrier', but the
> > >>> sideband spacing of ~ 1 kHz from the main lobe
> > >>> is odd.
> > >>>
> > >>> What do you see when you zoom into the
> > >>> main lobe? Can you guesstimate the
> > >>> spacing of the strongest sidelobes
> > >>> within that lump?
> > >>>
> > >>> 73,
> > >>> Mike, K8CN
> > >>>
> > ------------------------------------------------------------------------
> > >>>
> > >>> *From:* RFI <rfi-bounces+mike.carter=unh.edu@contesting.com>
> > >>> <mailto:rfi-bounces+mike.carter=unh.edu@contesting.com> on behalf of
> > >>> K9MA <k9ma@sdellington.us> <mailto:k9ma@sdellington.us>
> > >>> *Sent:* Wednesday, July 31, 2024 5:08 PM
> > >>> *To:* rfi@contesting.com <mailto:rfi@contesting.com>
> > >>> <rfi@contesting.com> <mailto:rfi@contesting.com>
> > >>> *Subject:* [RFI] New RFI Source
> > >>> CAUTION: This email originated from outside of the University
> > >>> System. Do not click links or open attachments unless you recognize
> > >>> the sender and know the content is safe.
> > >>>
> > >>>
> > >>> This RFI source has appeared recently:
> > >>>
> > >>>
> >
> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsdellington.us%2Fhr%2FRFI%2F24.07.31.png&data=05%7C02%7Cmike.carter%40unh.edu%7C5b47864c626340c4b55208dcb1a4e911%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C638580569052206306%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=I3QbXdcat4zw3df8oU7lalFjpj9VCt3Qcf%2FvhKK3Hfs%3D&reserved=0
> > >>> <https://sdellington.us/hr/RFI/24.07.31.png>
> > >>>
> > >>> It appears to be harmonics of about 78 kHz. However, unlike most SMPS
> > >>> RFI, it is very stable. It disappears at night, suggesting a solar
> > >>> system, but it persists, weakly, an hour or so after sunset. Maybe a
> > >>> solar system comm link, with a supercapacitor? However, I'm not
> > >>> aware of
> > >>> any new solar systems nearby. Anyone seen anything like this before?
> > >>>
> > >>> Needless to say, I'll be out tracking it soon.
> > >>>
> > >>> 73,
> > >>>
> > >>> --
> > >>> Scott K9MA
> > >>>
> > >>> k9ma@sdellington.us <mailto:k9ma@sdellington.us>
> > >>> _______________________________________________
> > >>> RFI mailing list
> > >>> RFI@contesting.com <mailto:RFI@contesting.com>
> > >>>
> >
> https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.contesting.com%2Fmailman%2Flistinfo%2Frfi&data=05%7C02%7Cmike.carter%40unh.edu%7C5b47864c626340c4b55208dcb1a4e911%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C638580569052216519%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=QvP3ylU%2F%2B1m33treb6O6%2FrhWdEi65qgjtlAMRgKbtmo%3D&reserved=0
> > >>> <http://lists.contesting.com/mailman/listinfo/rfi>
> > >>
> > >>
> > >> --
> > >> Scott K9MA
> > >>
> > >> k9ma@sdellington.us <mailto:k9ma@sdellington.us>
> > >
> > >
> >
> > --
> > Scott K9MA
> >
> > k9ma@sdellington.us
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
>
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