Hi Dick
I’m using an APC NS 1350 in my shack directly under the desk top. Computer, rig
power supply and two monitors plugged into the unit. Zero noise. Rig is a K3S
and I have a very low noise floor here, -140dbm, out in the country of TN. No
noise spikes at all.
73 Gene
N9TF
Sent from my mobile device.
On Jun 12, 2023, at 2:50 PM, RVZ via RFI <rfi@contesting.com> wrote:
Hello RFI Group,
I'm wondering if there is a commercially made UPS (Uninterruptable Power
Supply) that is RF quiet, or more RF quiet, than the average? I've used a
variety of UPS units and all of them have generated a great deal of RF on the
ham bands. I'm currently using an EATON SP-750, and like the other UPS units
I've had previously, it generates aprx. 2-3 S-units of noise on 80-10 meters.
If there aren't any quiet UPS units, what are the remedies for making making a
UPS quieter on the ham bands? Thanks in advance for your recommendations. 73,
Dick- K9OM
In a message dated 6/12/2023 11:00:08 AM Central Standard Time,
rfi-request@contesting.com writes:
Send RFI mailing list submissions to rfi@contesting.com To subscribe or
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edit your Subject line so it is more specificthan "Re: Contents of RFI
digest..." Today's Topics: 1. RFI on 15 meters at W9RE tracked down to home
0.37 miles away. (Don Kirk) 2. Re: RFI on 15 meters at W9RE tracked down
to home 0.37 miles away. (Alan Higbie) 3. Re: RFI on 15 meters at W9RE
tracked down to home 0.37 miles away. (Don Kirk)
---------------------------------------------------------------------- Message:
1Date: Sun, 11 Jun 2023 19:56:26 -0400From: Don Kirk <wd8dsb@gmail.com>To: RFI
<rfi@contesting.com>Subject: [RFI] RFI on 15 meters at W9RE tracked down to
home 0.37 miles away.Message-ID:
<CAKtW65eYrO4+Hn7mgaWe9SunmDv3S02LcYPmJ0Um-H4wONcCGQ@mail.gmail.com>Content-Type:
text/plain; charset="UTF-8" Mike (W9RE) has been experiencing RFI on 15 meters
when beaming North butnot during hours of darkness. By just driving around he
located what hethought was the property generating the RFI using a K3 in his
car with a 15meter mobile whip antenna. Mike asked for my help to confirm his
findingsusing my portable direction finding gear which we did yesterday, and I
justuploaded a video documenting this case. I try to avoid guessing what the
source of the RFI is, but at the moment weare very suspicious that a small grid
tied solar system is the source ofthe RFI. Mike will now follow up with the
homeowner to identify the truesource of the RFI, and then what can be done to
mitigate the RFI. For those interested here is a link to the youtube
video:https://youtu.be/yD7U-nH-AAg 73,Don (wd8dsb)
------------------------------ Message: 2Date: Sun, 11 Jun 2023 18:16:48
-0600From: Alan Higbie <alan.higbie@gmail.com>To: Don Kirk
<wd8dsb@gmail.com>Cc: RFI <rfi@contesting.com>Subject: Re: [RFI] RFI on 15
meters at W9RE tracked down to home 0.37 miles away.Message-ID:
<CAOftebM83=o_ySAKYmT6Gvz4puzkZOV9GFrc5pxprPRO3wvOSg@mail.gmail.com>Content-Type:
text/plain; charset="UTF-8" Hypothesis: Solar system.Next steps: (1) Ask
neighbor if recently installed solar system. (2) HaveMike park his receiver on
frequency of RFI spike 10 minutes before exacttime of sunrise - then continue
until 10 minutes after SR. (3) ask him toreport results back to you. 73,~ Alan
K0AV On Sun, Jun 11, 2023 at 5:56 PM Don Kirk <wd8dsb@gmail.com> wrote: > Mike
(W9RE) has been experiencing RFI on 15 meters when beaming North but> not
during hours of darkness. By just driving around he located what he> thought
was the property generating the RFI using a K3 in his car with a 15> meter
mobile whip antenna. Mike asked for my help to confirm his findings> using my
portable direction finding gear which we did yesterday, and I just> uploaded a
video documenting this case.>> I try to avoid guessing what the source of the
RFI is, but at the moment we> are very suspicious that a small grid tied solar
system is the source of> the RFI. Mike will now follow up with the homeowner
to identify the true> source of the RFI, and then what can be done to mitigate
the RFI.>> For those interested here is a link to the youtube video:>
https://youtu.be/yD7U-nH-AAg>> 73,> Don (wd8dsb)>
_______________________________________________> RFI mailing list>
RFI@contesting.com> http://lists.contesting.com/mailman/listinfo/rfi>
------------------------------ Message: 3Date: Sun, 11 Jun 2023 20:50:40
-0400From: Don Kirk <wd8dsb@gmail.com>To: Alan Higbie
<alan.higbie@gmail.com>Cc: RFI <rfi@contesting.com>Subject: Re: [RFI] RFI on 15
meters at W9RE tracked down to home 0.37 miles away.Message-ID:
<CAKtW65ctNUhUQ_HWQ-8aQUsT7xH+wg1OETbTfWDx6NO6Qdw4ew@mail.gmail.com>Content-Type:
text/plain; charset="UTF-8" Hi Alan, Just need to work with the homeowner to
identify the source. We haveutmost confidence the RFI is originating from
their property (we tookdirection finding readings from all sides of their
property) withouttrespassing on their property, and unfortunately we probably
even gotinto poison ivy when we approached their back property line via an
HOAretention pond. Mike has monitored the RFI for a long time and sees the RFI
disappeararound Sunset. Mike monitored it today but it was a very overcast
daywhich turned into a rainy day. Signal strength was very low early
thismorning after sunrise and eventually came up in strength but not as
strongas it was yesterday when it was a nice sunny day. The system is a year
oldand the homeowner said the system is not working (whatever that means)
andthat the installer went out of business. But again the only way to
reallyprove it's the Solar System (or some other device) is to be able to
turnthe RFI on and off by turning on and off the actual device causing the
RFIand until that's done it will always just be a guess (maybe a good guess,but
still a guess). The homeowners are elderly and were very suspicious of us when
we talkedwith them in person (and rightfully so) and we therefore all decided
itbest that the next step is for Mike to communicate with them via US mail(and
then hopefully with them or a family member via phone) which willhopefully
allow them to better understand the situation and the kind ofhelp we need from
them, etc. Just FYI,Don (wd8dsb) On Sun, Jun 11, 2023 at 8:17?PM Alan Higbie
<alan.higbie@gmail.com> wrote: > Hypothesis: Solar system.> Next steps: (1) Ask
neighbor if recently installed solar system. (2) Have> Mike park his receiver
on frequency of RFI spike 10 minutes before exact> time of sunrise - then
continue until 10 minutes after SR. (3) ask him to> report results back to
you.>> 73,> ~ Alan K0AV>> On Sun, Jun 11, 2023 at 5:56 PM Don Kirk
<wd8dsb@gmail.com> wrote:>>> Mike (W9RE) has been experiencing RFI on 15 meters
when beaming North but>> not during hours of darkness. By just driving around
he located what he>> thought was the property generating the RFI using a K3 in
his car with a>> 15>> meter mobile whip antenna. Mike asked for my help to
confirm his findings>> using my portable direction finding gear which we did
yesterday, and I>> just>> uploaded a video documenting this case.>>>> I try to
avoid guessing what the source of the RFI is, but at the moment>> we>> are very
suspicious that a small grid tied solar system is the source of>> the RFI.
Mike will now follow up with the homeowner to identify the true>> source of the
RFI, and then what can be done to mitigate the RFI.>>>> For those interested
here is a link to the youtube video:>> https://youtu.be/yD7U-nH-AAg>>>> 73,>>
Don (wd8dsb)>> _______________________________________________>> RFI mailing
list>> RFI@contesting.com>> http://lists.contesting.com/mailman/listinfo/rfi>>>
------------------------------ Subject: Digest Footer
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listRFI@contesting.comhttp://lists.contesting.com/mailman/listinfo/rfi
------------------------------ End of RFI Digest, Vol 245, Issue
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