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   Bruce Perens K6BP (bruceperens_k6bp@mastodon.radio)'s status on Monday, 02-Dec-2024 12:59:08 JST Bruce Perens K6BP

   WEB-888 is a web remote shortwave receiver that just plugs into an antenna, Ethernet, and power, and can serve 13 remote users (on different frequencies) simultaneously, $270 on AliExpress, there are many public receivers worldwide, try one at the below URL. Open Source / Open Hardware.
   https://www.rx-888.com/web/rx.html

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     Bruce Perens K6BP (bruceperens_k6bp@mastodon.radio)'s status on Wednesday, 04-Dec-2024 07:43:35 JST Bruce Perens K6BP

     in reply to

     • Henning Paul DC4HP

     @hennichodernich - That's unfortunate. I do see a schematic for RX-888.

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     Henning Paul DC4HP (hennichodernich@radiosocial.de)'s status on Wednesday, 04-Dec-2024 07:43:37 JST Henning Paul DC4HP

     in reply to

     @BrucePerens_K6BP Unfortunately not open. They neither published the FPGA block design nor the source code for their kernel module. You don't even get a schematic.

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     Bruce Perens K6BP (bruceperens_k6bp@mastodon.radio)'s status on Wednesday, 04-Dec-2024 07:53:38 JST Bruce Perens K6BP

     in reply to

     • Henning Paul DC4HP

     @hennichodernich - I also see this: https://github.com/jks-prv/Beagle_SDR_GPS/tree/master/verilog.Vivado.2022.2.ip , schematics for KiwiSDR 1 and 2, and I didn't look deeply for the kernel driver under the KiWi SDR code, but it bears looking at.

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     Bruce Perens K6BP (bruceperens_k6bp@mastodon.radio)'s status on Thursday, 05-Dec-2024 02:48:46 JST Bruce Perens K6BP

     in reply to

     • Henning Paul DC4HP

     @hennichodernich - OK, I understand the interconnect is different. What about the SDR portion?

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     Henning Paul DC4HP (hennichodernich@radiosocial.de)'s status on Thursday, 05-Dec-2024 02:48:47 JST Henning Paul DC4HP

     in reply to

     @BrucePerens_K6BP That's because the KiwiSDR uses a standalone FPGA that communicates with the SBC over SPI, while the Web-888 uses a Zynq-7000 SoX and shared memory for interaction between PL and PS parts.

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     Henning Paul DC4HP (hennichodernich@radiosocial.de)'s status on Thursday, 05-Dec-2024 02:48:49 JST Henning Paul DC4HP

     in reply to

     @BrucePerens_K6BP The Web-888 uses a totally different FPGA design and Linux kernel interface compared to the KiwiSDR.

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     Bruce Perens K6BP (bruceperens_k6bp@mastodon.radio)'s status on Tuesday, 10-Dec-2024 09:18:00 JST Bruce Perens K6BP

     in reply to

     • Henning Paul DC4HP

     @hennichodernich - I'm not endorsing it, but I think there should be a community effort to make an entirely free firmware. I guess this would take re-engineering the interconnect in the FPGA code, and the driver. I also think running it on a full Linux distribution is overkill, it could run on Busybox.

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     Henning Paul DC4HP (hennichodernich@radiosocial.de)'s status on Tuesday, 10-Dec-2024 09:18:02 JST Henning Paul DC4HP

     in reply to

     @BrucePerens_K6BP The actual demodulation code is the same, since it's running on the processor, but e.g. the spectrum calculation takes place in the FPGA.
     A lot of interaction with the programmable logic is hidden in the kernel driver which is controlled via ioctls.
     The forked KiwiSDR code can be found here https://github.com/RaspSDR/server/tree/master, but the source code of the kernel module unfortunately not.