2 Dec 2020, @ 0105 UTC tune/in.
I'm hearing / seeing a signal that is sweeping the HF bands from 2025.5 kHz up through around 6500 - 6600 kHz or so. The higher it goes, the weaker it gets.
It sweeps quickly through that range in 2 seconds, then repeats.
It's not a constant carrier though, like the normal ionosondes - there's only a signal every so often. There are carrier signal on these frequencies as it sweeps:
2025.5
2098.0
2165.5
2231.0
2297.0
...etc
Not a constant difference between signals either. As it gets higher in the frequency range, the signals seem to turn into a "double beep" whereas at the bottom of the range, it sounds like a single beep.
Here's a video recording of my waterfall, using HDSDR:
https://spacetubes.com/DX/2020.12.02_0015UTC_UNID.Sweeper.mp4Can't recall seeing anything like this before. I left it zoomed all the way out so you could see the sweeper going from left to right across the bands.
Location: N. Indiana
Radio used: RX888 SDR, 8 MHz bandwidth setting
Mode: SSB to hear the carrier as it "passes by", but AM detects it too, just like a normal ionosonde
Antenna: south-aimed DKAZ loop
Mark Pettifor
Goshen, IN
KC9DOC