[aprssig] Satgate

Andrew P. andrewemt at hotmail.com
Fri Aug 14 07:49:30 EDT 2015

No, that's a valid format, according to the APRS protocol specification (chapter 8). Position reports starting with @ or . are specified to have a timestamp prefix prior to the latitude; position reports starting with ! or = do not have the timestamp. Now, whether a given gating package properly supports all four formats is another question (for example, DuchiSat1 is restricted to only use ! format with compressed encoding).

I've checked this recently, because I just recently updated my software (YAAC) to support all four formats instead of only the = format it formerly beaconed.

Andrew Pavlin, KA2DDO
author of YAAC

> Date: Fri, 14 Aug 2015 08:17:22 +0200
> Subject: Re: [aprssig] Satgate
> On 14/08/2015 06:01, John Fickes via aprssig wrote:
>   So, when my station receives a packet from the ISS my UISS
> >   copies this
> >
> >     Fm N0AGI-1 To CQ Via RS0ISS* <UI pid=F0 Len=59 >[19:52:31]
> > @090052z4439.87N/09328.10W`-=5= MN,USA. sGate.John 3:16 ==-
> That is an invalid APRS packet. The coordinates must be direct after the 
> @.   This looks like it came from AGWPE, not from a TNC, is that 
> correct?  If so, check what AGWPE is doing...
> Bart

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