Hi Leon and all,
I quickly read the article:
https://store.outernet.is/blogs/the-official-outernet-blog/world-record
and
https://hackaday.com/2018/02/22/at-71572-km-you-wont-beat-this-lora-record/
I didn't see TWO WAY communication shown in their article, only a Downlink.
Is this the case?
Alan VK2ZIW
On Thu, 8 Mar 2018 14:13:51 +0200, Leon Lessing 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
Alan
Evil flourishes when good men do nothing.
Consider the Christmas child.
---------------------------------------------------------------------------
Alan Beard Unix Support Technician from 1984 to today
70 Wedmore Rd. Sun Solaris, AIX, HP/UX, Linux, SCO, MIPS
Emu Heights N.S.W. 2750 Routers, terminal servers, printers, terminals etc..
+61 2 47353013 (h) Support Programming, shell scripting, "C", assembler
0414 353013 (mobile) After uni, electronics tech
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
