FWIW: I see that regularly, in short bursts. Midday, just watching 80
while otherwise occupied, those multiple very narrow carriers come up
for anywhere from a few seconds to a minute or two, and then disappear.
Oddly, but thankfully, I'm not plagued with SMPS type noise ... well,
except when I was trying to work TX5S. I don't know what the carriers
are from but they look like a steady CW carrier, not noise.
Any email list on mailman.qth.net will strip all but plain ASCII text.
Emails sent in HTML likewise. It's not Elecraft censoring anything,
just the way the email list software is built.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Robert Strickland via Elecraft wrote on 4/5/2024 12:59 PM:
The screen shot of the noise is posted on QRZ.com. This link will get
you there.
https://forums.qrz.com/index.php?threads/noise-reduction-resources.908913/
On 4/2/2024 20:36, Robert Strickland via Elecraft wrote:
Thanks to those answering my request for noise reduction
sources/sites. Several pointed out the distinction between
heterodynes originating in the receiver and noise external to the
receiver. I was careless in the wording of my original post for which
I apologize. Since a picture is worth many words, I'm included a
screen shot of my panadapter tuned to 15m [see below] with the
"noise" spikes clearly pictured. I have not tried the house shut down
with the radio operating off a battery. Other time demands, but will
do so shortly. I'm sure that will be informative. Interesting that
the spikes occur only in the vicinity of 15m. They gradually diminish
outside 15m until they are completely gone by 20.000 and 22.000 MHz.
...robert KE2WY
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