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Want to resurrect your D/D2 MAC kit?
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<blockquote data-quote="fsphil" data-source="post: 1014844" data-attributes="member: 410643"><p>Here's the sample and updated grc flow graph which can display the input visually: <a href="https://www.sanslogic.co.uk/d2-mac-sample.zip" target="_blank">https://www.sanslogic.co.uk/d2-mac-sample.zip</a> <a href="https://www.sanslogic.co.uk/d2-mac-sample.png" target="_blank">https://www.sanslogic.co.uk/d2-mac-sample.png</a></p><p></p><p>Transmitter is a HackRF. In theory it can produce any kind of signal up to about 20MHz wide, which isn't quite enough for a proper D-MAC FM signal as it would have come from the satellite. I'm using a much lower deviation and hoping that the receiver can compensate. When I've done the same with PAL and an old Sky box it worked fine. <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>I've included the current d-mac.py generator script in there too, it takes a video sample.mp4 file and produces a baseband D-MAC signal samples.bin at the required 20.25MHz sample rate. It's not pretty code, just threw together to try things out. The data bursts are just filled with random data, the sync codes should be fine and I've copied the line 625 data from the R+S pattern generator output. It's written in python3 and uses ffmpeg to decode the video file.</p></blockquote><p></p>
[QUOTE="fsphil, post: 1014844, member: 410643"] Here's the sample and updated grc flow graph which can display the input visually: [URL]https://www.sanslogic.co.uk/d2-mac-sample.zip[/URL] [URL]https://www.sanslogic.co.uk/d2-mac-sample.png[/URL] Transmitter is a HackRF. In theory it can produce any kind of signal up to about 20MHz wide, which isn't quite enough for a proper D-MAC FM signal as it would have come from the satellite. I'm using a much lower deviation and hoping that the receiver can compensate. When I've done the same with PAL and an old Sky box it worked fine. :) I've included the current d-mac.py generator script in there too, it takes a video sample.mp4 file and produces a baseband D-MAC signal samples.bin at the required 20.25MHz sample rate. It's not pretty code, just threw together to try things out. The data bursts are just filled with random data, the sync codes should be fine and I've copied the line 625 data from the R+S pattern generator output. It's written in python3 and uses ffmpeg to decode the video file. [/QUOTE]
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