USB based SX1303

[nmaas87]

Any thoughts on supporting SX1303 with USB?
I want to use the RAK5146 with SX1303, LBT and GPS - which only comes with USB (SPI version does not support Listen Before Talk, probably because of being too bottlenecked by SPI)

https://store.rakwireless.com/products/wislink-lpwan-concentrator-rak5146?variant=39677269409990

Thanks a lot :)

#89

[tonysmith55]

"probably because of being too bottlenecked by SPI"
If you look at the RAK datasheet and circuit schematic you will find to achieve LBT requires a third receiver chip. The USB version of the RAK 5146 has a USB to SPI convertor to connect to the SX1303 chip. The same convertor has a second SPI port to connect to the third receiver which performs LBT. It's not about the performance of SPI vs USB but simply the circuit schematic adopted by RAK.

[nmaas87]

Thanks @tonysmith55 for the insight, but I see no SPI version with LBT for sale.
However, this was a bit off-topic from me, sorry, I just wanted to ask to include USB based SX1303 support into the basicstation :).
Thank you :)

[tonysmith55]

While I did not fully explain, given the RAK design the only way that LBT can be achieved is via USB. This gives additional support for your request.