[Xastir] Tracking with Xastir using NMEA tracker

[Lynn W. Deffenbaugh (Mr)]

Just FYI, I haven't seen any of the referenced attachments make it 
through the list.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32



On 7/3/2017 1:51 PM, Jason KG4WSV wrote:
> On Mon, Jul 3, 2017 at 11:00 AM, Kurt <ksaves2 at sbcglobal.net> wrote:
>> I've been trying to get some of the electronics oriented rocket guys to come up with ham band NMEA trackers that would have better range and just inject a callsign here and there in an NMEA string.
> see attached.  It speaks APRS (TNC-2 style packets, but in ASCII, like APRS-IS).
>
> It's 250mW and I don't usually drop packets, but the GPS often drops a
> few during boost - vertical velocity is too fast for it.
>
> and it fits in a 38mm nosecone.  The blue thing is a 3d printed
> bulkhead that fits a madcow 38mm PC nosecone (just add a couple of
> countersunk holes).
>
>> Before you APRS people get yanked,
> This is the xastir list, not the APRS list. :)
>
>> We like to use high rate tracking as one position every 5 seconds
> I routinely operate at 1Hz.  Right now I'm sending a packet every 3s
> with timeslotting so I can have multiple units on the air at the same
> time (think 2 stage). since it's 9600 baud or 19.2k baud over the air,
> I should be able to easily get 2 packets a second, but that puts some
> timing requirements on my little tracker processor and I haven't done
> the work (e.g. i may need the GPS PPS signal connected).
>
> You can also run multiple receivers - e.g. an omni and a yagi - and
> xastir will handle the deduplication.
>
> I wish I could get APRX to digi it to 70cm for me (so I can see it on
> the Kenwood HT) without hacking the source, but no joy.  No one wants
> to digi a TNC2 packet,  not even an original copy.  I'm thinking I'll
> give up on that and just let xastir igate it for me, since that's
> simpler than anything else i've come up with.  I really don't want the
> tracker to speak KISS, because it's trivial to get coordinates with a
> receiver and a terminal application they way it's working now.
>
> I've thought about adding vertical velocity, or even 3d velocity, but
> that's on down the list. It could be nice to have some verification
> other than visual that something came apart at apogee.
>
> I've also thought about connecting xastir's festival output to a
> transmitter - who needs a Kate for $1000?
>
> -Jason
> kg4wsv
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