Last Friday we managed to finally track this thing down. It was a broken FSK telemetry system on an FM radio tower. It was about 30 km Southwest of our radar.
I did a small write up about this: http://kaira.sgo.fi/2013/12/perfect-incoherent-scatter-radar-jammer.html Thanks for all the help. juha On Wed, Dec 11, 2013 at 4:34 PM, Johnathan Corgan <johnat...@corganlabs.com>wrote: > On 12/10/2013 02:00 PM, Miki Lustig - KK6GEO wrote: > > > These look like 2pi jumps -- which is the an artifact if the > > unwrapping is not working well. > > Sure, I see what you mean. > > Backing up and just plotting the unwrapped phase, you can see in the > first image that overall it is increasing at one rate, then shifts to a > lower rate about 1.5 seconds into the file. > > The finer structure is much more interesting. The second image shows > the phase making fast jumps every 500 samples (10 ms), with periods of > oscillation in between. The detail on this is in image 3. > > I still have no idea what this is, but it sort of looks like an > oscillator that is disciplined at 100 Hz. > > -- > Johnathan Corgan, Corgan Labs > SDR Training and Development Services > http://corganlabs.com >
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