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[aprssig] DTMF Text Messaging Gateway PIC

Robert Bruninga bruninga at usna.edu
Wed Feb 18 18:35:28 UTC 2009


Today I noticed that the Basic Stamp PIC processor already
contains a DTMF encoder!

Gosh, All I have to do is connect its serial port to a TNC and
its audio to a TX, and I have an instant, stand-alone APRS==> to
Text Paging gateway!

I guess the first application I will tackle will be simple
messaging from APRS to the DTMF paging radios (FT11,41,51, or

Anyone else have the Basic Stamp PIC's and wanna play?


> -----Original Message-----
> From: aprssig-bounces at tapr.org 
> [mailto:aprssig-bounces at tapr.org] On Behalf Of Robert Bruninga
> Sent: Tuesday, February 10, 2009 10:39 AM
> To: 'TAPR APRS Mailing List'; noskosteve at yahoo.com
> Subject: Re: [aprssig] Text Messaging Radios now
> DTMF Messaging works!
> Took me a while, but I can now finally send DTMF messages
> manually from any radio and have them display on the
> FT11/41/51, TH78 series radios.  I have updated my docs to
> how:
> www.aprs.org/FT51-TH78.html 
> It needed the PAGE codes first to serve as a header to tell
> radio who the message is coming from and who it is addressed
> So the format is really:
> #MMMMMM...#
> Where TTT is the TO-ID, FFF is the FROM station ID and MMMM...
> Is the message.  Each station's own TO-ID whould be his own
> suffix.  For example, WB4APR is APR which becomes "277".  Then
> for APRS, we have defined 6 GROUP codes 991 through 996 for
> the recepient can select or opt-out of any of these data
> So setting up one of these radios to receive messages
> 1) Putting in your own ID ###
> 2) Putting in the six GROUP codes above
> 3) Entering PAGE mode.
> THen from any other radio, you can send messages manually to
> that radio.  To send your callsign, just put 996*FFF (where
> is your ID) into the DTMF memory of any DTMF radio and put any
> intended messages #MMMMMMMMMM# into additional memories.  For
> example
> "CALLME" is #2C2A5C5C6A3B#
> "WB4APR" is #9A2B42A7A7B#
> For troop number "995" with a score of "95" would be
> "995 95" or #9951C95#
> It works!  Find out who in your club has these radios and put
> one at Net Control for your next operation.  Figure out ways
> use this.
> Bob, Wb4APR
> > -----Original Message-----
> > Thanks for looking at this.  As you can see, I am rapidly
> trying
> > to catch up on my docs and ask for help in refining this new
> > application.  for the last several months of talking about
> these
> > radios, I was only narrowly thinking of these radios in a
> > two-way only message excange.  And I was completely
> overlooking
> > the more readily useful special-event scenario where most
> > goes into the Net control, and so this vastly multiplies the
> > functionality for these radios since ANY DTMF HT can
> to
> > them, not just other models of the same radio.
> > 
> > > Also I [was] hoping to see the DTMF key 
> > > algorithm used by these radios, but it 
> > > fell short just a bit.
> > 
> > Yes, I need to update those web pages now with this new
> > excitement to make it easy for people to synthesize a
> > from their existing HT for display on those HT's.  I also
> > to test this, since I found an old TH78 and just need time
> > work on this..
> > 
> > I am hoping some other people with these radios will help us
> out
> > here...
> > 
> > Thanks
> > Bob, wb4apr
> > 
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