28 lines
1.6 KiB
Markdown
28 lines
1.6 KiB
Markdown
This is a GnuRadio SDR project to fully build a RX and TX stack for Meshtastic.
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Now, why would I do this??
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An SDR can decode all the presets at the same time. Real hardware can only decode the preset in which its set to.
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An SDR, depending on the amount of bandwidth captured, can decode up to all of 900MHz ISM spectrum for all LoRa channels. We only need to throw CPU at the problem.
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We can now RX LoRa on non-standard frequencies, like Amateur radio bands with superb propagation. Think 6M or 10M .This also depends on getting the TX flow done. Meshtastic presets do have 250KHz, 125KHz, and 62.5KHz - so this does make LoRa usable for lower bands!
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Dependency: https://github.com/tapparelj/gr-lora_sdr
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Note: Meshtastic is a trademark by these fine folks! https://meshtastic.org . We wouldn't be doing SDR shenanigans without'em!
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1. Download and install https://github.com/tapparelj/gr-lora_sdr
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2. To install, clone the repo to your area of choosing.
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3. Inside there is a "gnuradio scrips/RX" directory with 8 files. Some are US and others are EU.
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4. Open the 250KHz respective to your area
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5. Change the Source block to the hardware you have. This may be a RTL-SDR, HackRF, USRP, LimeSDR. You might have to install the driver if it's custom hardware.
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5. Check for errors. Once good, run the script! You'll see data in console as its being evaluated.
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6. To get data OUT of GnuRadio, connect to the respective TCP ports from 20000-20007 for the specific Preset type.
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7. You can take this in whatever program you wish, but I provide a very rough Node-Red flow to parse a part of the data.
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