Guys,
This has been a very enlightening discussion. And has given me ideas on
tracking down my local RFI issue.
I have a IC-9700 and have been using a 3 element VHF measuring tape yagi to
locate the power line noise source. Adding in attenuation using AM
detector as I get closer to the source.
A question I have is:
Is there anywhere on the web or perhaps at ARRL where similar signatures of
various types of noise sources are able to be viewed.
I haven’t yet looked so this may be redundant but to be able to see a
switch mode supply vs a grow light on a waterfall or whatever might help
narrow down the search.
I have a local source that seems to be on a timer and the waterfall shows a
squiggly pattern.
Just a thought.
Thanks again for all this excellent discussion
73
Steve NA5C
On Fri, Dec 30, 2022 at 2:59 PM Steve Muenich <srmuenich@gmail.com> wrote:
> Guys,
> This has been a very enlightening discussion. And has given me ideas on
> tracking down my local RFI issue.
> I have a IC-9700 and have been using a 3 element VHF measuring tape yagi
> to local. Adding in attenuation using AM as get closer to the source.
>
> A question I have is:
> Is there any where a location on the web or perhaps at ARRL when similar
> signatures of various types of noise sources are able to be viewed.
> I haven’t yet looked so this may be redundant but to be able to see a
> switch mode supply vs a grow light on a waterfall or whatever might help
> narrow down the search.
>
> I have a local source that seems to be on a timer and the waterfall shows
> a squiggly pattern.
>
> Just a thought.
>
> Thanks again for all this excellent discussion
>
> 73
> Steve NA5C
>
>
> Sent from my mobile device
>
> > On Dec 30, 2022, at 2:10 PM, Jim Brown <jim@audiosystemsgroup.com>
> wrote:
> >
> > On 12/30/2022 9:58 AM, Hare, Ed, W1RFI wrote:
> >> The SDR waterfall will not be very helpful with power-line noise, but
> they are great at identifying switching power supply noises and noises that
> pulse on and off in a regular pattern.
> >> Most of the time, though, we are less concerned with "what is it" as we
> are with "where is it?"
> >
> > The principle virtues of the waterfall are recognizing whether it's
> impulse noise or electronic noise; multiple electronic sources and their
> active hours so that 1) we know when to chase them and 2) when multiple
> sources are present, help us chase each individually.
> >
> > 73, Jim K9YC
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
>
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