HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: ~SIGINT~ on October 28, 2022, 0027 UTC
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UNID 9100.0 kHz, 50 kHz Wide, 00:03 UTC 28 OCT 2022
00:03 UTC - High power UNID signal observed on 9100.0 kHz, 50 kHz wide;
00:05 UTC - Off for a few seconds and returned at reduced power;
00:11 UTC - Signal temporarily off (approx 10 seconds);
00:12 UTC - Signal returned at high power;
00:17 UTC - Signal stopped transmitting for a few seconds and returned at reduced power;
00:23 UTC - Signal stopped transmitting for approx 10 seconds;
00:24 UTC - Signal returned at high power;
00:29 UTC - Signal stopped transmitting for approx 25 seconds;
00:30 UTC - Signal returned at low power;
00:35 UTC - Signal stopped transmitting for 30 seconds;
00:36 UTC - Signal returned at high power;
00:41 UTC - Signal stopped transmitting for 30 seconds;
00:42 UTC - Signal returned at low power;
00:44 UTC - Signal stopped transmitting. Nothing else heard.
Note: It appears as the pattern is transmit for 5 minutes, 30 seconds, off for 30 seconds then back on alternating between high and low power or perhaps a change of antenna direction.
(http://www.milspec.ca/board/img/2022-10-27_200410.png)
RSPduo | End-fed longwire antenna