Re: [Discuss-gnuradio] ADS-B decoding

[Jordan Hayes]

> From the links read I thought I should expect bursts of radiofrequency
> at 1090MHz whose duration is 0.5 microseconds, differently spaced
> depending on whether I am getting the preamble or the bits.
>
> I have tried to monitor 1090MHz using DSB rx, but I could not see any
> carrier at all ...

I can't hear it on my discone either, but I have an SBS-1 and swapped 
antennae with my IC-PR1500 and recorded this:

http://infothecary.org/jordan/tmp/20061105-SSR.wav

I've read that you should be listening in SSB, so the first half of the 
recording is that way; however, it seems simple AM is the better way, 
and the 2nd half of the recoding is done that way.

Let me know when you're ready to release some code to decode it! :-)

/jordan