[OZAPRS] FT8 for HF APRS ?

[Murray Parnell]

Hi Warren
There are no wspr igates that i am aware of.
I am not a software guy but the wspr decoding software by Joe Taylor is
open source.
The wspr encoder from qrp labs would be ideal for aprs as it already has a
GPS interface for location, timing and frequency reference. It would just
need someone to change the firmware to encode in aprs format.

https://www.qrp-labs.com/ultimate3.html

I would be happy to host a wspr aprs igate if the software was available.
How about it Glen ?

Murray
(VK2UMZ)

On 2 Dec 2017 10:48 AM, "Warren_Brown" <warbn at telstra.com> wrote:

> Interesting idea, but is there any APRS WSPR gates running?
>
>
>
> Warren vk3byd
>
>
>
> *From:* OZAPRS [mailto:ozaprs-bounces at aprs.net.au] *On Behalf Of *Murray
> Parnell
> *Sent:* Saturday, 2 December 2017 11:41
> *To:* Australian APRS Users
> *Subject:* Re: [OZAPRS] FT8 for HF APRS ?
>
>
>
> Hi Glen
>
> Read this
>
> http://aprs.org/aprs-wspr.html
>
>
>
> Murray (VK2UMZ)
>
>
>
> On 2 Dec 2017 9:54 AM, "Glen English VK1XX" <glenlist at pacificmedia.com.au>
> wrote:
>
> Hi Mark
>
> Yeah no need to preserve AX25 frame precisely agreed, just need to be
> interface compatible.  I've got a few HF modems up my sleeve, most require
> *some* linearity in the PA, so maybe just move to nFSK /single tone this
> tends to be more tolerant to bad setup...especially when the aim is to
> share the nearby spectrum. With the single tone modes, if they are kept
> >1400Hz in the microphone input, the overdriving distortions usually don't
> get through the SSB filter...
>
> And Andrew, most microcontrollers can execute reasonable modems these
> days, there is enough grunt, there is a blur between general purpose
> microcontrollers and dedicated DSPs. Where help is required is on the
> decode side for the FEC, especially with large frame sizes (which yields
> greater "coding gain") , For a signal sense mode, it only has to detect the
> presence of a signal, not fully decode it. For decoders, things like
> Odroids and other small linux boxes make excellent demods.
>
>
>
>
> On 2/12/2017 10:51 AM, Mark Jessop wrote:
>
> FT8, JT65 and similar are far too restrictive for something like HF APRS.
> They are quite specifically designed for making short QSOs, not for passing
> of arbitrary data (though is is possible, in a limited sense). Take a look
> at the JT65 spec and you will see what I mean.
>
> The concept of a MFSK-based mode with *good* FEC is still a good one
> though, but you'd probably be better off either rolling your own or
> starting from something like THOR or Olivia.
>
> Would the AX25 packet format still need to stay? If you could drop that it
> would give a lot more flexibility...
>
> 73
> Mark VK5QI/VK4
> (Currently SW of Longreach...)
>
> On 2 Dec. 2017 08:15, "Glen English VK1XX" <glenlist at pacificmedia.com.au
> <mailto:glenlist at pacificmedia.com.au>> wrote:
>
>     I have my own low bit rate HF capable position/ aprs reporting
>     modem etc but I was thinking at FT8, given the widespread use,
>     would make a good replacement for FSK300 (which is dumb arse
>     poorly suited with no FEC on HF), and that the decoders allow for
>     multiple simultaneous overlapping transmissions in the same BW.
>
>
>     doing a port for dire wolf would be fairly straightforward.
>
>     glen Vk1XX
>
>
>
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