Woke up this AM to find a buzz-saw occupying 7140-7240 kHz. That bandwidth tells me that the pulses are approximately 20 microsec wide, with a rep rate of just about exactly 50 Hz -- pulses show 20 msec separation and sidebands show lines about 50 Hz apart.
If you work out the round-trip propagation time for 20 msec pulse spacing it comes out to around 3,000 km. But that is only 1,800 mi -- hardly what I'd call OTH -- like from Russia to here.
Anybody have any idea what this really is?
73 de Dave, N7AIG
I started watching around 0500 MST, or 1200 Z. Located in Tucson, AZ. When I last looked, around 1300 Z it was still running. Really strong here, at least S9 at times.
What puzzles me is why anyone would use a long propagating frequency like 7200 kHz at gray line time, when they can only discern objects within 3,000 km? I would have expected OTH Radar to have a much longer reach.
time for sleep . .