[aprssig] Sub-second timeslots
wes at ai4px.com
Tue Dec 16 13:47:59 CST 2008
I once hooked two KISS tnc's back to back. Was catching 9k6 mic-e packets
at the 2m voice repeater receiver and gating them out on 144.39 at 1200
baud. Neat experiment... there was no need to mute the mic-e packets they
just sounded like squelch tail.
----- Original Message -----
From: "Scott Miller" <scott at opentrac.org>
To: "TAPR APRS Mailing List" <aprssig at tapr.org>
Sent: Tuesday, December 16, 2008 2:45 PM
Subject: Re: [aprssig] Sub-second timeslots
>> good idea. I wonder if the RMC is consistent across multiple GPS
> Probably not. I think it's the default for at least the Garmin GPS 18,
> and I think the top-of-second sentence is configurable now. It might be
> that I have to make it an option on the tracker end as well. I don't
> know that there's any guarantee that the NMEA sentences are aligned to
> the top of the second at all, but on the few I've checked so far that
> seems to be the case.
>> But I like the idea of a spec to outline the concepts of time-slotting.
>> But it would be nice to test with at least one WIDEn-N path so that this
>> technique coiuld be used through cross-band digipeaters. I think having
>> at least one hop should be conisdered a requirement.
> An extra 7 bytes shouldn't be a problem. Still, I'd rather have the
> brains for that sort of thing in the digipeater itself. Or you could do
> it with a couple of KISS TNCs back-to-back...
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