[OZAPRS] LoRA tracking

Wed Nov 8 08:13:16 AEDT 2017

Sure is! He sells a few variants...  868 MHz is europe's version of our
918-928 MHz ISM band, and is funnily enough in a very sensible location (2x
434 MHz, to catch harmonics from bad 434 MHz devices). I suspect the limits
would be defined in the software you need to write, so as David has
mentioned, you would need to make sure you get that bit right!

Be careful of getting confused between LoRa (a 'chirp spread spectrum'
modulation scheme, the physical layer), and LoRaWAN (a communications
protocol - the 'MAC' layer). All of the LoRaWAN IoT gateways around
Australia that I know of are running on 915 MHz, yes. If you're not
intending on messing around with LoRaWAN gateways, then there's nothing
stopping you from using 434 MHz.

I'm just using the LoRa modems because they were a convenient way of
getting very reliable bi-directional comms going between the cutdown
payload and the chase car. I'm not using any of the LoRaWAN stuff (the spec
hadn't been released when I started working on the payload), instead I
wrote my own binary packet format suited to my application.

73
Mark VK5QI

On Wed, Nov 8, 2017 at 5:23 AM, Glen English VK1XX <
glenlist at pacificmedia.com.au> wrote:

> the 868 one is illegal in AUstralia.
>
>
> On 8/11/2017 6:19 AM, Dave wrote:
> >
> > The Jaycar gateway is a Dragino. I've seen an Aus site with them
> > https://www.iot-store.com.au/collections/iot-networking-comms/LoRa-IoT
> > and at about 2/3 Jaycar prices too.
> >
> > I believe that 915Mhz is recommended in Aus.
> >
> > Dave
> >
> >
> > On 7/11/2017 7:11 PM, Mark Jessop wrote:
> >> Nice descriptive reply there...
> >>
> >> Not quite sure why we're talking about LoRa in the
> >> Australian *APRS* list, but anyway...
> >>
> >> Cheap LoRa Arduino
> >> Shield: https://www.seeedstudio.com/Dragino-LoRa-Shield-support-
> 433M-frequency-p-2672.html
> >> (similar available for 915 MHz).
> >> LoRa Raspberry Pi
> >> Shield: http://www.dragino.com/products/module/item/106-lora-
> gps-hat.html
> >> ... and probably something similar available from Jaycar, I guess?
> >>
> >> We've been using LoRa modules in the Project Horus 'flight
> >> termination' payload (which also has GPS tracking) for a few years
> >> now. We run them on the 434 MHz ISM band at 25mW, for command &
> >> control of the cutdown mechanism (nichrome wire). We have a whole
> >> ecosystem of software based around communicating with the cutdown
> >> payload and transferring data around the chase car's network.
> >> Ground Station: https://github.com/projecthorus/HorusGroundStation
> >> Payload: https://github.com/projecthorus/FlexTrack-Horus
> >>
> >> Quite a few libraries around to talk to the LoRa ICs (usually a
> >> Semtech SX127x series chip).
> >> Python Library for use on a Raspberry
> >> Pi: https://github.com/mayeranalytics/pySX127x
> >> Arduino Library: http://www.airspayce.com/mikem/arduino/RadioHead/
> >>
> >> Unfortunately the LoRa modulation scheme is patented, so use of it on
> >> the amateur radio band is a bit contentious. At the very least,
> >> there's a reverse engineered gnuradio library
> >> available: https://github.com/BastilleResearch/gr-lora
> >>
> >> 73
> >> Mark VK5QI
> >>
> >>
> >> On Tue, Nov 7, 2017 at 5:58 PM, Andrew Rich <vk4tec at tech-software.net
> >> <mailto:vk4tec at tech-software.net>> wrote:
> >>
> >>     Jaycar
> >>
> >>     Sent from my iPhone
> >>
> >>     On 7 Nov 2017, at 5:13 pm, Justin Albury <justin at jacomms.com
> >>     <mailto:justin at jacomms.com>> wrote:
> >>
> >>>     Whats involved in (hardware) for the LoRA projects??
> >>>
> >>>
> >>>
> >>>     Any links??
> >>>
> >>>
> >>>
> >>>     Justin Albury
> >>>
> >>>     J Albury Communications
> >>>
> >>>     justin at jacomms.com <mailto:justin at jacomms.com>
> >>>
> >>>     0417246791
> >>>
> >>>
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> >>>
> >>>     *From:*OZAPRS [mailto:ozaprs-bounces at aprs.net.au
> >>>     <mailto:ozaprs-bounces at aprs.net.au>] *On Behalf Of
> >>>     *vk4tec at tech-software.net <mailto:vk4tec at tech-software.net>
> >>>     *Sent:* Tuesday, 7 November 2017 11:50 AM
> >>>     *To:* 'Australian APRS Users' <ozaprs at aprs.net.au
> >>>     <mailto:ozaprs at aprs.net.au>>
> >>>     *Subject:* [OZAPRS] LoRA tracking
> >>>
> >>>
> >>>
> >>>     Playing with GPS / Arduino and LoRA 915 MHz modules
> >>>
> >>>
> >>>
> >>>     Andy VK4TEC
> >>>
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