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[aprssig] APRStt (APRS touchtone DTMF)

Jason Rausch jason at ke4nyv.com
Fri Sep 19 23:39:28 UTC 2008


Bob,

Looking forward to seeing the new Windows version of
APRStt.  I played around with it a LONG time ago with
the old DOS interface that Wes KD4RDB came up with.

I also wrote a simple app that converted callsigns to
the APRStt format.  Both the long and hashed versions.
 I still have it posted for download on my site at:

http://www.ke4nyv.com/software.htm

Jason KE4NYV
RPC Electronics
www.rpc-electronics.com


--- Robert Bruninga <bruninga at usna.edu> wrote:

> > How are you going to differentiate the DTMF 
> > tones used for this from the repeater control
> tones?   
> 
> Good questions.  I have tried to get people who know
> these codes
> to provide the best recommendations.  Best we have
> come up with
> is to begin each APRS string with ##A or ##B or ##C
> depending of
> the APRS application.  The ## in many repeaters
> tells the
> repeater to ignore the following tones.  THen two of
> them
> improve that probabilty of detection.  The A or B or
> C indicates
> the type of APRS code to follow...
> 
> > 1. Most repeater owners who use DTMF control 
> > guard them very  carefully.  One wrong tone can 
> > cause the repeater to go crazy, meaning you 
> > might have make a trip to a mountain top 
> > or restricted access building.  They are not 
> > universal, and many poeple will be suspicious 
> > if you ask for them out of the blue. 
> 
> Yes, only the existing repeater sysop knows if this
> application
> will be good on his repeater or better to be placed
> elsewhere.
> There are so many unused repeaters, that there are
> plenty of
> places to put them.  Actually, APRStt was mostly
> designed for
> its own frequency at an event or special purpose. 
> It should not
> be placed on a repeater that would have problems for
> it.
> 
> > 2. Some repeaters strip DTMF off, others do not...
> > 3. How will I know if a repeater in an area 
> > uses this? Is  this going to be in ARRL 
> > repeater directory, or sent on APRS?  
> 
> Yes, it will show up on every APRS map, or FINDU, or
> whatever.
> The APRStt engine will appear on all maps with its
> special
> APRStt symbol and frequency so that everyone can
> tell where it
> is...  But of course the DTMF user doesn't see the
> local APRS
> map, so you are right, it will be in directories,
> and it should
> be included in the voice announcement.
> 
> > I don't think you want to just blindy try 
> > sending DTMF on a repeater without asking 
> > a local user. 
> 
> Yes, that is a big concern.  These are all issues we
> need to
> deal with, but at least now finally we have the
> mechanism.  Now
> we see how to implement it..
> 
> Glad to have you on board and helping...
> 
> Thanks
> Bob, WB4APR
> 
> > Re: [aprssig] APRStt (APRS touchtone DTMF)
> > 
> > > > APRStt coming soon!
> > > 
> > >>  but this will be a new version that
> > >> runs under windows using only the sound 
> > >> card for both DTMF decoding and Voice-Back
> synthesis.
> > > 
> > > Ehhh...is this going to be available on
> platforms 
> > > that are suitable for unattended operation?
> (sigh)
> > 
> > See www.aprs.org/aprstt.html
> > 
> > Bob, WB4APR
> > 
> > 
> 
> 
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Jason KE4NYV
RPC Electronics
www.rpc-electronics.com




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