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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