take measurements NOW before they turn it on... broadcast AM thru
50 mhz....
then duck
bill ny9h with a mere little 10KW system with zero noise
On 9/22/2020 10:21 AM, Jpock wrote:
Ed,
I have a RSPduo SDRplay and Kenwood TH-D74 handheld radio setups.
Someone is putting in a large solar farm just north of me in Sturgis
Mich., about 10 miles. It is not in service as of yet, but it will
soon be operational. If you wish, I can take some measurements once
it is operational.
Is there anything extra or special you want me to do, just let me know.
Respectfully,
Jim N9PXO
------ Original Message ------
From: "Hare, Ed W1RFI" <w1rfi@arrl.org>
To: "rfi@contesting.com" <rfi@contesting.com>; "Jpock" <jhpock@gmail.com>
Sent: 9/22/2020 09:46:07
Subject: Re: [RFI] 2 MW Solar Farm
If any of you all have an HF mobile set up and can go to one of these
farms, please do and provide a report.
Date/Time:
Location (GPS coordinates and/or street address. Describe location if
necessary).
How far was the measurement location from any part of the solar system?
Sun conditions:
Band:
Receiver:
Antenna:
Antenna height:
Mode (AM preferred, SSB useful):
Bandwidth (6 kHz preferred, 3 kHz useful):
Preamp off, if possible:
Noise level:
Is the noise relatively constant across a large part of the band, or
does it get louder and weaker at regular intervals as the receiver is
tuned.
If the receiver is an SDR, a waterfall or spectral sweep can be
useful. If possible, remport the received signal level in absolute
units, ie dBm, dBuV, uV, etc.
If anyone has a spectrum analyzer and, even better, a calibrated
loop, sweeps of each band made in RMS and quasi-peak (if available),
9 kHz bandwidth, with a known reference level at the top of the
analyzer screen, so much the better.
If you can make the same measurements on 6 meters, so much the
better, because if we have an absolute receive level, a known-gain
antenna and known receiver conditions, we can estimate whether the
system exceeeds the FCC emissions limits above 30 MHz.
If you make these reports here, I will pick up on them and see what
we can determine about the interference potential based on actual
reports.
Ed Hare, W1RFI
--------------------------------------------------------------------------------
From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> on behalf of
Jpock <jhpock@gmail.com>
Sent: Tuesday, September 22, 2020 8:48 AM
To:rfi@contesting.com <rfi@contesting.com>
Subject: [RFI] 2 MW Solar Farm
To rfi@contesting.com
Kim, I am in the same type of situation about Commercial Solar Farms in
LaGrange Indiana. The county commissioners passed a ordinance allowing
agricultural property to be transformed into solar farms. This type of
change can cause alot of problems for amateur radio operators.
Any type of information that can be shared will be useful! Thank-you
Scott K9MA for sharing.
Respectfully,
Jim N9PXO
------ Original Message ------
From: "K9MA" <k9ma@sdellington.us>
To: rfi@contesting.com
Sent: 9/21/2020 23:42:36
Subject: Re: [RFI] 2 MW Solar Farm
>Hopefully not as bad as the 2.3 MS Siemens wind turbines in New
Zealand. ZL6QH had to abandon a huge antenna farm because of RFI.
Their noise floor went up 50 dB on 80, and only a few of the planned
turbines were in operation. While not quite the same, solar and wind
power systems both use high frequency switching converters capable of
generating lots of RFI.
>
>http://www.zl6qh.com/rf-noise-measurements-quartz-hill-2009-v3.pdf
>
>73,
>Scott K9MA
>
>
>
>On 9/21/2020 11:56 AM, Kim Elmore wrote:
>>I just learned that a 2 MW solar farm is being built about 3/4 mi
from my QTH. I don’t know who is behind it, though I ssume it’s a
utility company of some sort as 2 MW sounds moderately large. Does
anyone have any experience with these? How much of an RFI source are
they?
>>
>>Kim N5OP
>>
>>"People that make music together cannot be enemies, at least as
long as the music lasts." -- Paul Hindemith
>>_______________________________________________
>>RFI mailing list
>>RFI@contesting.com
>>http://lists.contesting.com/mailman/listinfo/rfi
>
>
>-- Scott K9MA
>
>k9ma@sdellington.us
>
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