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SDR radio, Software Defined Radio
Modulating DAB+ from Satellite with HackRF One
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<blockquote data-quote="Adam792" data-source="post: 1139433" data-attributes="member: 330868"><p>This week I've been using the HackRF on the other side, for receiving the DAB signal!</p><p></p><p>The two German national multiplexes on 23.5°E use DVB-GSE (12641.3V 1500 DVB-S2 8PSK 2/3), which is only decodable hardware-wise on some of the higher end professional-level DVB PC cards available. Those work because it's possible to dump out the raw BB frames (one of the levels below the MPEG-TS in regular DVB-S2, which for DVB-GSE instead contains network data). The DAB eti-tools then have a bbfedi2eti tool which extracts the DAB ETI frames from this baseband data.</p><p></p><p>This means, if you can get the raw IQ data using a software defined radio, it's then possible to use a software tool called leandvb to decode the BB frames in software, rather than using an expensive hardware device.</p><p></p><p>[URL unfurl="true"]https://github.com/pabr/leansdr/[/URL]</p><p></p><p>This even works with a £30 RTL-SDR stick, but the high frequency used on 23.5°E meant I had to use the HackRF instead, as the RTL-SDR only receives up to 1766MHz, not the 2041MHz (12641-10600) required. Older RTL-SDR sticks based on the E4000 chip do apparently work as they can receive up to around 2300MHz.</p><p></p><p>I dug out my old Skybox M3 which has LNB loop out, so that I can power the LNB and provide the 22kHz as required. Then after a bit of work on filtering the input from the HackRF into an old laptop running Linux down to a 2MHz wide sampled file, I successfully processed it with leandvb to BB frames.</p><p></p><p>This file then decoded with <strong>bbfedi2eti </strong>and gave me the two German national DAB+ muxes, DR Deutschland 5C on MIS1, and Antenne DE on MIS2. Pretty happy with this, without needing any new equipment. <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>[ATTACH=full]146390[/ATTACH]</p><p></p><p>[ATTACH=full]146391[/ATTACH]</p><p></p><p>[ATTACH=full]146392[/ATTACH]</p></blockquote><p></p>
[QUOTE="Adam792, post: 1139433, member: 330868"] This week I've been using the HackRF on the other side, for receiving the DAB signal! The two German national multiplexes on 23.5°E use DVB-GSE (12641.3V 1500 DVB-S2 8PSK 2/3), which is only decodable hardware-wise on some of the higher end professional-level DVB PC cards available. Those work because it's possible to dump out the raw BB frames (one of the levels below the MPEG-TS in regular DVB-S2, which for DVB-GSE instead contains network data). The DAB eti-tools then have a bbfedi2eti tool which extracts the DAB ETI frames from this baseband data. This means, if you can get the raw IQ data using a software defined radio, it's then possible to use a software tool called leandvb to decode the BB frames in software, rather than using an expensive hardware device. [URL unfurl="true"]https://github.com/pabr/leansdr/[/URL] This even works with a £30 RTL-SDR stick, but the high frequency used on 23.5°E meant I had to use the HackRF instead, as the RTL-SDR only receives up to 1766MHz, not the 2041MHz (12641-10600) required. Older RTL-SDR sticks based on the E4000 chip do apparently work as they can receive up to around 2300MHz. I dug out my old Skybox M3 which has LNB loop out, so that I can power the LNB and provide the 22kHz as required. Then after a bit of work on filtering the input from the HackRF into an old laptop running Linux down to a 2MHz wide sampled file, I successfully processed it with leandvb to BB frames. This file then decoded with [B]bbfedi2eti [/B]and gave me the two German national DAB+ muxes, DR Deutschland 5C on MIS1, and Antenne DE on MIS2. Pretty happy with this, without needing any new equipment. :) [ATTACH type="full" alt="Screenshot from 2022-12-16 17-32-10.png"]146390[/ATTACH] [ATTACH type="full" alt="Screenshot_20221216_174442.png"]146391[/ATTACH] [ATTACH type="full" alt="Screenshot_20221216_174523.png"]146392[/ATTACH] [/QUOTE]
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Modulating DAB+ from Satellite with HackRF One
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