[600MRG] photo of noise spikes here on 630M

[John Langridge]

Hi Doug,

Just eye-balling the waterfall, these look to be about 60 Hz apart.
It will be tough to isolate any closer than calling it some type of
electronic do-dad..... Iphone charger?  Dish TV LNA?  wall wart?
These seem quite common in suburban environments.  I get similar
results from a camera battery charger that my xyl uses pretty
regularly.  We have a rule that she only charges it between about 11am
and 4pm.

Do the lines sound like carriers?  The ones near 800 and 1000 Hz
almost look like they have some type of modulation associated off to
the sides.

Do the signals ever disappear or are they constant?

Have you added anything new in your house in the last two years that
plugs into the wall?  Something electronic from Amazon perhaps?  New
internet?

If you are 100% certain that its not in your house (these look strong
so they may be close!)  and if you have a portable receiver, you might
be able to figure out where they are NOT originating from and work
from there (walk around and listen).

just spitballing here...

73/GL

John..




On 8/20/22, Doug Allen <dougk4ly at gmail.com> wrote:
> Hey guys,
> I'm hoping to be able to resume 2-way contacts soon. When I last operated
> two years ago, I had almost no interference on 630M. Yesterday I mentioned
> the noise spikes from an unknown source outside my home that now hinder my
> 630M reception.  Here's a photo of those noise spikes on both the Flex 6500
> panadapter and on the WSJT-x graph.. You'll also see around 1490 Hz on the
> WSJT-x graph the WSPR signal of N1DAY which is conveniently between noise
> spikes.  Weak signals on the same frequencies as strong noise spikes don't
> get decoded. The noise spikes are narrow band and equidistant apart, as you
> can see, and some much stronger than others.  Any ideas on what this
> interference could be or how I might try to trace it down?
> Doug K4LY
> Inman, SC
>
> [image: 542e7757-d1e8-4a11-bdf4-948ea2bb3475.png]
>