Interesting --
I have done codec2 over LoRa and now working on putting some other frills
on it. :-).
On 8 March 2018 at 17:43, Leon Lessing <zs6...@gmail.com> wrote:
> Hi guys,
> Thought I was subscribed here, found out with a bang that I am not.
>
> Here goes.
> Doing investigations into Lora it seems their spectrum utilization really
> sucks, in that on 125kHz channel only one device can talk at 240bit/s at a
> time (class A device). I honestly thought that being spread spectrum we
> could have 20 to 30 devices talking at the same time, very much like the
> gps signals. (the sx1301 seems to do multi channel reception but on 8
> different frequencies)
>
> One question here is we run 100Hz deviation about 500Hz apart at 300 to
> 600 baud, how many simultaneous channels could be decoded with a single
> stm32f4 or stm32f7 device. Basically running 22k samples per second I/Q
>
> The idea here is basically for aprs, so a digipeater should be able to
> decode 10 or more "channels" at a time. And then be able to "talk back" to
> a device, very much like sigfox does. The talk back could be a normal
> 1200baud fsk channel.
> Using a si4463 we could conceivably transmit on 70cm with 20 to 100mW and
> receive on 144.800/144.390 depending on the region used.
>
> 73 de Leon
> ZS6LMG
>
>
> Leon Lessing
> 雷立安
> ZS6LMG/AC9GU
>
>
>
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