[OZAPRS] new modem
Glen English VK1XX
glenlist at pacificmedia.com.au
Sat Feb 3 21:04:52 AEDT 2018
David, I have replied to you off list.
My guess is the new mode is somewhere between 15 and 20dB better than
300 baud HF packet.
cheers
On 3/02/2018 8:27 PM, David Giddy wrote:
> Glenn,
>
> OK, thanks. Happy to wait. I'm pleased you are helping move APRS into
> the 21st century - I think the approach you are taking has lots of
> interesting possibilities down the track.
>
> Glenn VK3YY and I were discussing this week as we hiked to The Viking
> the potential for such an approach to enable a light weight back-pack
> portable HF tracker which would be of great use to us SOTA activators
> when we get out into the mountains where VHF coverage is very limited.
>
> As you noted, the encoder has very limited computing requirement and
> building a small 30m transmitter as a plug on to a RPi Zero putting
> out a couple of watts seems quite achievable. Couple that with heavily
> loaded 30m tape measure whip antenna would hopefully work. EIRP will
> be very low, but with a reasonable spread of gateways, may actually
> prove usable. I've been quite impressed with the ability of 30m 300
> baud to be heard from deep within mountain valleys (see may spots over
> the last few days when Glenn and I were in the Alpine National Park).
>
> 73
>
> David
> VK3IL
>
> On Sat, Feb 3, 2018 at 7:56 PM, Glen English VK1XX
> <glenlist at pacificmedia.com.au <mailto:glenlist at pacificmedia.com.au>>
> wrote:
>
> Hi David
>
> No integration with dire wolf right now. But close.
>
> I will have a gateway set up here next week on two bands, 80 and 30.
>
> it will be in the same freq segments as the 300 baud packet
>
> I have ordered some more ODroids to deploy onto a couple of
> amateur's properties with HF radios for gateways, will be on some
> time this month I expect.
>
> In the meantime I will let the system mature just a little more
> before adding you into the beta program
> 73
> g
>
>
>
>
>
> On 3/02/2018 4:25 PM, David Giddy wrote:
>
> Hi Glenn,
>
> I'd be interested to give it a try on my RPi3 in the car. Does
> it currently integrate with Direwolf, or is it stand alone (I
> haven't followed all the development emails) ?
> Are you going to run a gateway to test it against? If so, what
> frequency?
>
> 73
>
> David
> VK3IL
>
> On Fri, Feb 2, 2018 at 8:57 PM, Glen English VK1XX
> <glenlist at pacificmedia.com.au
> <mailto:glenlist at pacificmedia.com.au>
> <mailto:glenlist at pacificmedia.com.au
> <mailto:glenlist at pacificmedia.com.au>>> wrote:
>
> new modem....
>
> I have a built package now for the modem, that does all the
> prerequistite installs, fiddles to the groups, permissions,
> rtprio, packages etc, full install , confs and test
> programs in
> makefile....
>
> Who else wants a go with it ? I will accept a couple more.
>
> linux Debian or derivative , Alsa required. some ability with
> Linux required obviously.
>
> PC x86 (32 bit) or ARMv7(32) ARMv8 (64) platforms
>
> might work on AMD64 . works on ARM64 so.....
>
>
>
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>
> --
>
> 73
>
> David
> VK3IL
>
>
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> --
>
> 73
>
> David
> VK3IL
>
>
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