[amsat-bb] Lora and other modes

[Howie DeFelice]

Stuart, GW7HPW, the RFM-22 guru from the $50sat team, has done some testing with LoRA and has flown a few pico balloons to compare max range with the RFM-22. LoRA shows a significant increase in usable range based on Stuart's testing. Howeve, it appears LEO satellite doppler may pose a problem with the standard hardware. Further testing would be required to make a final determination.


Howie AB2S


________________________________
From: AMSAT-BB <amsat-bb-bounces at amsat.org> on behalf of Ross Whenmouth <ross at topwire.co.nz>
Sent: Tuesday, July 4, 2017 1:43 AM
To: amsat-bb at amsat.org
Subject: Re: [amsat-bb] Lora and other modes

> Date: Mon, 3 Jul 2017 10:58:27 +0530
> From: Ashhar Farhan<farhanbox at gmail.com>
>
> Is Lora a candidate for satellites? How well does it handle doppler? Given
> that it uses CSS(Chirp Spread Spectrum), it is claimed to be resilient to
> doppler shift.
>
> Does anybody have any further details or knowledge?
Hi Ashhar,

LORA is/uses a proprietary protocol, however, it has already been
reverse-engineered by software defined radio people, so ground stations
could potentially use an SDR instead of a LORA chipset:
https://myriadrf.org/blog/lora-modem-limesdr/
[https://www.bing.com/th?id=OVP.QKgyi09JbcuxzNA5wRTr8gEsDh&pid=Api]<https://myriadrf.org/blog/lora-modem-limesdr/>

LoRa modem with LimeSDR - Myriad<https://myriadrf.org/blog/lora-modem-limesdr/>
myriadrf.org
LoRa is a chirp-based modulation format that can operate beneath the noise floor. Its robust, low power, and low rate -- and a candidate technology for connecting the ...



https://static1.squarespace.com/static/54cecce7e4b054df1848b5f9/t/57489e6e07eaa0105215dc6c/1464376943218/Reversing-Lora-Knight.pdf
MATT KNIGHT // BASTILLE NETWORKS REVERSING LORA<https://static1.squarespace.com/static/54cecce7e4b054df1848b5f9/t/57489e6e07eaa0105215dc6c/1464376943218/Reversing-Lora-Knight.pdf>
static1.squarespace.com
reversing lora matt knight // bastille networks exploring next-generation wireless




I think that it might be interesting to try EME with an FM-chirp signal
(one optimised for the task ie not LORA) as an alternative to JT65...


73 ZL2WRW
Ross Whenmouth
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