[aprssig] HT/mic DTMF standards

[Robert Bruninga]

>> Anyone that wants to add to the table 
>> send in your limits ...
 
> THD7   has 16 with 1=QZ
> D700   has 16 with 1=QZ
> FT470  has ?? with 7=PQRS
> FT-51R has 16 wiht 1=QZ
> TH-79a has 16 No Alpha at all. 
> VX-7R  has 16 with 7=pqrs

Now then we need opinions also on the selection code?
Is it multi-key presses to cycle through the single key options,
IE L is encoded as "555" or is it encoded as "53" or "35" as in
Echolink?

Bob, WB4APR