[TVARC] Unknown QRM

[Steven Roth]

When I work FT8, at times the spectrum display shows a spaced signal.  I am
close to the golf course cart path and occasionally get ignition spikes
from golf carts.  But, these are different.  I suspect some kind of
"splash" from overmodulation somewhere in the nearby spectrum but I have
not been able to identify it, or even verify that it is a received signal
or an intermod.  I took some snippets and wonder if any of you have seen
similar.  Both 15M and 20M spectrum.

Of course, the wider lines are FT8 signals.  I am referring to the narrow
and evenly spaced signals.

Thanks, Steve Roth   AD4K   Villa Berea, Polo Ridge

[image: 15M 2.jpg]
[image: Spectrum 15M 1.jpg]
[image: Spectrum 20M 1.jpg]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/tvarc/attachments/20220116/7ee78d0e/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 15M 2.jpg
Type: image/jpeg
Size: 10484 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/tvarc/attachments/20220116/7ee78d0e/attachment-0003.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Spectrum 15M 1.jpg
Type: image/jpeg
Size: 53068 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/tvarc/attachments/20220116/7ee78d0e/attachment-0004.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Spectrum 20M 1.jpg
Type: image/jpeg
Size: 35597 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/tvarc/attachments/20220116/7ee78d0e/attachment-0005.jpg>