[RFI] RFI Digest, Vol 220, Issue 26

Tue May 25 12:05:40 EDT 2021

Probably old information, but Fair-Rite has this 2016 QST article linked on their site:

https://www.fair-rite.com/wpapers_anotes/can-home-solar-power-and-ham-radio-exist/ <https://www.fair-rite.com/wpapers_anotes/can-home-solar-power-and-ham-radio-exist/>

Ken
________________
Ken Wyatt
wyattphoto at mac.com

> On May 25, 2021, at 10:00 AM, rfi-request at contesting.com wrote:
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> Today's Topics:
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>   1. Re: SOLAR INSTALLATION PROS/CONS (Gary Johnson)
>   2. Re: Crepe Myrtle growing into power pole RFI Why? (Charles Plunk)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 25 May 2021 07:47:50 -0700
> From: Gary Johnson <gwj at wb9jps.com>
> To: rfi at contesting.com, rtdevine at comcast.net
> Subject: Re: [RFI] SOLAR INSTALLATION PROS/CONS
> Message-ID: <B0F95A44-0F03-4FE7-BA29-4100AED68B1E at wb9jps.com>
> Content-Type: text/plain;	charset=utf-8
> 
> Search for solaredge in our archives at http://lists.contesting.com/mailman/listinfo/rfi <http://lists.contesting.com/mailman/listinfo/rfi> and you will find hundreds of posts. The company was also the subject of a QST article by KQ6RS. In a word, SolarEdge is notorious for RFI problems due to their microinverters. The system installed next door is one of the reasons I no longer have a home station, if that tells you anything. But if the installer can supply Enphase, then you have a chance. If I had a choice, I?d go with a single, central inverter.
> 
> -Gary NA6O
> 
>> 
>> I have talked with the company (Sun Run Installation). He is going to check
>> Solar Edge micro inverters to see if problems.  I believe they use Solar
>> Edge but they have and can put Enphase micro inverters instead at a slightly
>> higher cost. 
>> 
>> Thoughts???
>> 
>> Robert T. Devine, KC6AWX
> 
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Tue, 25 May 2021 10:13:11 -0500
> From: Charles Plunk <af4o at twc.com>
> To: Rfi List <rfi at contesting.com>
> Subject: Re: [RFI] Crepe Myrtle growing into power pole RFI Why?
> Message-ID: <27feefd3-3cab-28a8-d592-eefcdfeba6ff at twc.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> All I know is the crepe myrtle had overtaken the ~ lower 20' of the 
> pole. Some branches >1" in diameter had grown around the pole, the 
> branches flattening out as they touched the pole. Only thing at that 
> height it could be touching was the stapled ground as it was shy of the 
> CATV/Phone level. I never saw it touching the ground though as the 
> foliage was too thick.
> 
> ID'ed as 120hz, direction with 6m/2m beams, triangulated with 2m 
> portable, heard it with ultrasonic on a completely wind free night 
> matching noise pattern pointing at the crepe myrtle (~10' height), heard 
> nothing top half of the pole, noise was heard on one side of the pole. 
> Was getting s9+10db noise on 80m and all through the HF bands up through 
> 2m. But doublet end was within ~20' of the pole. Crepe myrtle cut away 
> from the pole and the noise is completely gone. In fact some 
> intermittent I had been hearing in that direction is gone.
> 
> Pole is minimal hardware with 3x 7.2kv phase lines going across the top 
> and a street light. About 10-15 years ago they completely rebuilt the 
> pole with new power hardware, due to my complaints, and it has been 
> noise free since until a few days ago.
> 
> In fairness though, the noise was active for about 2 days solid but with 
> varying pattern before I tracked and has been gone now for about 1 day 
> so maybe not enough time to fully evaluate as a success. The 
> wind/weather has been very calm throughout this period. If it comes back 
> will report it here.
> 
> Years ago I had 2 similar issues here but with vines. One on the 3 
> phase, one on single phase. In each case they were removed and the noise 
> gone. Foliage here in the south is very moist and aggressive especially 
> this time of the year.
> 
> 
>> 
>> As for the crepe myrtle, you can eliminate that as a cause of your RFI 
>> even if it were touching the primary. You'll get ultrasound and 
>> audible noise but you will not get rf. Contrary to what many people 
>> say about finding their sources as trees touching the line, I have 
>> never had a tree arching to the wire creating RF noise. If the crepe 
>> myrtle gets within a couple of feet of the primary turn it into your 
>> utility and they'll take care of it.
>> 
>> 
>> 
> 
> 
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> End of RFI Digest, Vol 220, Issue 26
> ************************************