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Re: [Discuss-gnuradio] Having issues getting APT-DECODER Sample working

From: Tommy James Tracy II
Subject: Re: [Discuss-gnuradio] Having issues getting APT-DECODER Sample working
Date: Sun, 07 Oct 2012 22:34:49 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:15.0) Gecko/20120907 Thunderbird/15.0.1

On 10/7/12 9:48 PM, Marcus D. Leech wrote:
>> On 10/7/12 7:23 PM, Patrik Tast wrote:
>>> You will have to investigate more.
>>> Try download/build the
>>> <http://www.qsl.net/5b4az/pkg/apt/wxapt/wxapt.html>  or (I use)
>>> <http://atpdec.sourceforge.net/>
>>> It shouldn't be that hard...
>>> Patrik
>> Yes, thank you. I would run wxapt or atpdec if my goal was to decode the
>> APT images, but my goal is different.
>> I would like to take a gnuradio program that is currently running on one
>> machine, and split it among several computers. I chose this program
>> because A it does not require a USRP (I feed in a straight RAW file), B
>> it is non trivial and has a branch; it is also fairly compute intensive
>> when compared to other 'easier' gnuradio applications.
>> My goal is to get APT decoding to work in gnuradio without using any
>> other programs.
>> Thanks again!
>> Tom
> I put this together a few months back, attached.
> It decodes it down to the symbol level, but doesn't turn it into useful
> bitmap files or anything.  That's a little outside the scope of what
>   Gnu Radio is intended for.

Perfect! I like your algorithm. What I have done is taken Patrik's WAV
file and fed it in to the flowgraph after the Frequency demodulation
block, removing everything that came before.

The result was a completely grey image. Also, the FFT didnt show
anything. I will continue tweaking it.

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  Tommy J. Tracy II
 Computer Engineering
University of Virginia

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