Well done! Patrik
On Tue, 2013-12-17 at 17:40 -0500, Juha Vierinen wrote: > 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 > <[email protected]> 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 > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
