[OZAPRS] FT8 for HF APRS ?

[Glen English VK1XX]

ahhh I don't deem it suitable for the job, adapted to do what it wasnt 
designed for.


On 2/12/2017 1:03 PM, Murray Parnell wrote:
> 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 
> <mailto: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
>     <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
>     <mailto: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>
>             <mailto: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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