Thank you, Gary. The signal is not there
all the time; it was there yesterday, Fri:08-Jul around 11:30
UTC, but wasn’t there several times when I checked this
morning, Sat:09-Jul. As stated in my original post, I usually
notice it when I tune into WWV at 15 MHz, or when I’m
listening to the upper part of the 20-meter band and see the
blips in the waterfall above 14.5 MHz. Given the frequency, I
don’t believe it to be local to New England (Kriss up in NH
often sees it as well), and is likely propagation from
somewhere more distant, although CHU on 14670 kHz was coming
in when I took the screenshot yesterday. Next time I notice
it, I’ll check what regions are ‘skipping’ in on 20-meters,
and also check WWV and other commercial stations to get a
sense of propagation while I’m seeing the mystery signal.
If it is some type of frequency-hopping
communication mode, I’m impressed that it is spanning a
frequency range of about 700 kHz. That’s pretty big at HF
frequencies, but maybe not so up in the VHF and UHF bands.
By the way, my monitoring here is with SDR
Console, Airspy HF+ Discovery, fed from a random longwire
coupled through a 9:1 unun.
Thanks again. Have a great weekend.
After enlarging the screen shot I see what
you are talking about. I’ve actually been monitoring 14 MHz
lately and have never noticed that phenomenon before here in
Central, IL. I am using SDR Console, Airspy HF+Discovery and
a Wellbrook Loop antenna. I will watch for it though,