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Re: [Discuss-gnuradio] APT signals

From: Bill Tracey
Subject: Re: [Discuss-gnuradio] APT signals
Date: Fri, 08 Dec 2006 23:18:50 -0600


I can grab some APT audio with a USRP and Bob McGwier's rx apt code. Or are you looking for the raw data coming off the TVRF -- could probably do that as well but will need some pointers as to how to grab the raw sample off the TVRF card -- suppose one just takes the rxapt python code and hacks it to dump to a file sink?

I've also got a Hamtronics R139 I can grab audio from -- although it's gotten a bit deaf of late. Pics from it can be seen @: http://oddjob.yi.org:8888/wxpics/index.html



At 10:44 PM 12/8/2006, Berndt Josef Wulf wrote:

Ok, let's try it this way:

Is there someone with the equipment and time to record APT signals transmitted
by NOAA satellites in the 137MHz band? Alternatively, geostationary weather
satellites transmit WEFAX pictures at around 1691MHz (Hey, were are the guys
that tuned into GPS spectrum which is right next door... :-)

I want to demodulate the AM/FM 2400Hz sub-carrier signal and display the
image. Currently I'm not in the position to capture the spectrum myself due
to lack of equipment but this is about to change.

I can provide info on satellite passes and frequencies for your location.

cheerio Berndt

On Wednesday 06 December 2006 14:20, Berndt Josef Wulf wrote:
> G'day,
> Has anyone sampled NOAA or METEOR signals in the 137MHz spectrum which they
> wouldn't mind sharing the spectrum data file(s)?

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