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[aprssig] RE TH-D7 and Group Code (SPCL/AlterNet)

Steve Sobodos steve at scsvideo.com
Sun Mar 5 20:42:17 UTC 2006


----- Original Message ----- 
From: "Andy AB9FX" <ab9fx at aprs.pl>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Sunday, March 05, 2006 11:58 AM
Subject: Re: [aprssig] RE TH-D7 and Group Code (SPCL/AlterNet)


>
> ----- Original Message ----- 
> From: <kb2scs at optonline.net>
> To: <aprssig at lists.tapr.org>
> Sent: Sunday, March 05, 2006 06:38
> Subject: [aprssig] RE TH-D7 and Group Code (SPCL/AlterNet)
>
>
> > Hi Steve
> >               I do not know how the TH-D7 program code is coded to
> > handel SPCL and AlterNet. But  I do know how APRS software is
> > supposed to work with SPCL and ALterNet.
> >
> > How SPCL is supposed to work according to the APRS Spec.
> > APRS Software is supposed to allow the user to change his ToCall to
> > "SPCL". When the user does so his APRS software is supposed to filter
> > out all other Stations that do not have "SPCL" as there ToCall. Which
> > would cause only the stations with the ToCall of "SPCL" to show up on
> > their Maps.
> > Note all other stations running APRS software  on 144.390 would see
> > the "SPCL" stations on their map.
> >
> > How AlterNet is supposed to work according to the APRS Spec.
> > APRS Software is supposed to allow the user to change his ToCall to
> > any valid AX25 ToCall. When the user does so his APRS Software is
> > supposed to filter out all other Stations that do not use this
> > AlterNet ToCall. Which would cause only the stations with the same
> > AlterNet ToCall to show up on their maps.
> > Note  all other stations running APRS software on 144.390 are not
> > supposed to see the stations using the AlterNet ToCall.
> >
> > The above "Note" sentence is supposed to be the difference between
> > "SPCL" and "AlterNet" according to the APRS Spec.
> >
> > I do not know if the TH-D7 has implemented this part of the APRS
> > Spec.
> >
> > APRSDos and APRS-SCS do adhere to the APRS Spec. So "SPCL" and
> > "AlterNet" do work in APRSdos and APRS-SCS.
> > There are probably other APRS Software that adhere to the APRS Spec
> > in this manner but I have only used APRSdos and APRS-SCS.
> >
> > I hope this has been of some help.
> >
> > Let us hope we never witness the "Silence Of The Hams"
> > 73 DE John  KB2SCS
> >       E-Mail:            kb2scs at arrl.net
> >       APRS-SCS     http://www.tapr.org/~kb2scs
> >       Web Page:     http://www.qsl.net/kb2scs
> >
>
> Only explanation of SPCL I've found for TH-D7 is in the PG-4W manual.
> Although manual seems to be for TH-D7A not TH-D7A(G), is still on the
> market. After some tests with my TH-D7A(G), SPCL works the same way as
> explained on page 22, PG-4W manual.
> SPCL in the TH-D7 is implemented only for some uncompressed APRS data
> formats.
> You can filter out packets other than addressed to GPSxyz, SYMxyz and
other
> then in Mic-E format.
> In other words, setting SPCL in your TH-D7 you see all SPCL, all Mic-E,
all
> GPSxyz, all SYMxyz. You filter out packets such as addressed to APRS,
> APU..., APT... etc. and are not compressed in Mic-E.
> 73!
> Andy

Thanks, the other manuals available on the Kenwood site only have the quote
I included in my original post.

Steve





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