The LONGWAVE MESSAGE BOARD
Posted by Ed Holland on February 15, 2023 at 20:58:38.
A "whooper" signal 13556.300. Apparently random keying intervals of about 1 sec duration. When coming in at the highest strengths observed, there is a back-wave about 200 Hz lower, just visible on the waterfall, and heard for one or two brief periods. This is very similar to a signal heard a few times at PVC central, although on those occasions only the "keyed" signal, including the chirp, has been audible. I'm seeing/hearing another sporadic chirp signal, sometimes two in quick succession, upward in frequency, at 13554.500, with an occasional abrupt shift up to 135554.900 in the first or second instance in a pair of transmissions. TSN is also managing to break through the incessant CODAR with a nice steady note.
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Heard via the KPH receiver while doing some clandestine listening at work. (~ noon, PST)
File Attachment 1: Whooper_13556.JPG
File Attachment 2: Whoop_With_annotation.png