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HF Mystery Signals / Re: Strange data (?) signal on 6860 kHz
« on: September 16, 2025, 1948 UTC »
I heard the signal again early this a.m., Pacific time (Sept 16th, UTC), from tune in at 1229 UTC until it cut off completely at 1309 UTC, which was 6:09 a.m. Pacific Time. Frequency was 6988 kHz. The signal seemed to increase in strength from 1229 to 1300 or so, from around S1 out of 5 to S3 out of 5, before seeming to dip again right before cut off.
The signal also -- just like last time -- had what sounded like a polar flutter or fast fade to it, maybe 6-10 fades per second. Cut off was the same as I described and WA4FHY has described. Like flipping a switch.
Unfortunately, neither time I've heard this carrier have conditions or activity on 40M been good enough to judge the 6988 kHz signal against anything else. Both times I did NOT hear the Petropavlovsk 'K' beacon on 7039, which usually is a pretty good beacon to N Asia and the N Pacific. But, as we all know, prop can vary from region to region. Still, this signal stuck out when there was no DX activity, to speak of, in the lower reaches of the 40M band (CW was dead).
Being that this signal is a bit erratic, and that the increase in signal might have been due to a grey line effect (indicating it might be in the US), I wonder if this is a pirate signal of some sort. Especially considering the proximity to the pirate radio frequencies.
Just throwing that out there. At this point, I have no idea what the signal may be.
This time I tuned it in on my DX-394, using my indoor wire.
The signal also -- just like last time -- had what sounded like a polar flutter or fast fade to it, maybe 6-10 fades per second. Cut off was the same as I described and WA4FHY has described. Like flipping a switch.
Unfortunately, neither time I've heard this carrier have conditions or activity on 40M been good enough to judge the 6988 kHz signal against anything else. Both times I did NOT hear the Petropavlovsk 'K' beacon on 7039, which usually is a pretty good beacon to N Asia and the N Pacific. But, as we all know, prop can vary from region to region. Still, this signal stuck out when there was no DX activity, to speak of, in the lower reaches of the 40M band (CW was dead).
Being that this signal is a bit erratic, and that the increase in signal might have been due to a grey line effect (indicating it might be in the US), I wonder if this is a pirate signal of some sort. Especially considering the proximity to the pirate radio frequencies.
Just throwing that out there. At this point, I have no idea what the signal may be.
This time I tuned it in on my DX-394, using my indoor wire.