HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: Traveling Wave on April 18, 2018, 2358 UTC
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2331 - 2340 UTC - Logged PIPs at 4920,4990, 5060, 5140, 5220, 5300, 5380 5790 5880 kHz. Was not able to see how far down the band they started because they stopped before I completed the list. Maximum signal strength was S9 as they moved from the lower frequency listed to the higher frequency and back again. I would approximate a 3 second interval between each repeated PIP spike. Viewing them on the HDSDR panadapter from 4550 kHz to 5300 KHz showed that they are milliseconds apart as they moved from the low to the high frequency.