Sent: Tuesday, December 17, 2013 11:41 PM
Cc: gnuradio mailing list
Subject: Re: [Discuss-gnuradio] Need help identifying jammer signal
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
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:
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.
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
On 12/09/2013 07:26 PM, Juha Vierinen wrote:
I recorded a 10 second snippet of 50 kHz baseband signal in interleaved
I and Q with 32-bit floating point format.
The signal is definitely frequency modulated, but it doesn't appear to
be by data. Plotting the unwrap(diff(unwrap(arg(s))) shows a
These look like 2pi jumps -- which is the an artifact if the unwrapping is not
working well.
On Dec 10, 2013, at 1:55 PM, Johnathan Corgan johnat...@corganlabs.com wrote:
On 12/09/2013 07:26 PM, Juha Vierinen wrote:
I recorded a 10 second snippet of 50 kHz baseband signal in interleaved
It might be an IF local oscillator whose signal is leaking outside. Hence,
the small bandwidth and the drifts on that small band.
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Hi guys,
Thank you for your helpful suggestions. We still haven't managed to
pinpoint where the signal is coming from, but we have just dispatched a
black SUV with a three letter acronym stencilled on it (our university's
initials) to hunt for the signal with a spectrum analyzer and a yagi.
[mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Juha
Vierinen
Sent: Tuesday, 10 December, 2013 04:26
To: Patrik Tast
Cc: gnuradio mailing list
Subject: Re: [Discuss-gnuradio] Need help identifying jammer signal
Hi guys,
Thank you for your helpful suggestions. We still
Terve Juha,
Some animal neck collar TX:er are very close to that feq (440 MHz).
It could be on a wolf, reindeer or a hunter that use a *home brew*
(illegal) collar on his dog. Building a *home brew* dog collar is
popular today since you can get parts without any questions asked...
I would
On 12/06/2013 10:48 AM, Juha Vierinen wrote:
A scope plot of the signal shows something that looks a little bit
like frequency shift keying.
Make sure the signal is filtered to the 10K width and attach an FM demod
block to that (just set the sensitivity to 1.0 for now). It definitely
looks
On 12/06/2013 11:05 AM, Johnathan Corgan wrote:
On 12/06/2013 10:48 AM, Juha Vierinen wrote:
A scope plot of the signal shows something that looks a little bit
like frequency shift keying.
Make sure the signal is filtered to the 10K width and attach an FM demod
block to that (just set the
On 12/06/2013 02:12 PM, Johnathan Corgan wrote:
If you want, I could let you upload a capture file to gnuradio.org so
everyone could join the hunt.
The hunt for RFI October.
This signal will get worse. It'll get worse, and we'll be lucky to
live through it.
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