[aprssig] HT/mic DTMF standards

Jeff Dugas radarbuzz at delphiforums.com
Tue Oct 7 20:26:22 EDT 2008

Wonder if possible for the D710 to be changed to the "PQRS" configuration
via firmware upgrade?
That seems more widely implemented / standard.


-----Original Message-----

Update to the APRStt table of existing radio DTMF pads:
 TH-D7   has 16 with 1=qz   multi-press A=next-letter
 TM-D700 has 16 with 1=qz   multi-press A=next-letter
 TM-D710 has ?? With 1=qz   multi-press C=next-letter
 FT470   has ?? with 7=PQRS any encoding?
 FT-51R  has 16 wiht 1=QZ   any encoding?
 TH-79a  has 16             No Alpha at all. 
 VX-7R   has 16 with 7=PQRS any encoding?
 VX-8R   has ?? With 7=PQRS multipress  "mode"=next-letter
 Cell Phones    use  7=pqrs multipress  PAUSE=next-letter
 Echolink...    Uses 1=QZ   two-digits-per-letter-fixed

 APRStt proposed use 7=pqrs multi-press A=next-letter

If anyone can fill in the missing knowledge. It would be appreciated.  Or
add any other radios that have LETTER definitions on the keypad.
Particularly, what do the FT's and VX7R do with the alphabetic keys?  Do
they spell some menu responses?

Notice, that I am leaning towards the final defination for APRStt as shown
above.  The only open item is what key to use for the "next-letter" key.
I'm leaning towards "A" since all radios except the D710 are compatible with
it, and maybe we can change the D710 (though it doesn't matter, since APRStt
is not needed with a D710 since it can send APRS directly).

> K1RFD (author of EchoLink) seems willing to consider possibly 
> supporting MULTI-PRESS in addition to his two-key method at some time 
> in the future to come more in line with cell phone use... So it looks 
> to me like the APRStt standard should be:
> Multi-press(lower case first), with 7=pqrs, and A=next-letter
> See the APRStt web page www.aprs.org/aprstt.html It is evolving, so 
> some sections are out of date as we nail these issues down...
> And for ABBREVIATED CALLSIGNS, once the system has received your 
> pre-loaded DTMF fully spelled callsign, then F5SMZ suggests that using 
> the SUFFIX is the least complex way of entering a shorter call as long 
> as it does not conflict with anyone else on that same APRStt 
> frequency.
> IE, "APR" (27A777) instead of "WB4APR" 
> (922444427A777).  Where the "A" key is used as the "next-letter" 
> separator if adjacent letters are on the same key.
> Bob, WB4APR

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