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[aprssig] HT/mic DTMF standards

Mark Cheavens mcheavens at usa.net
Tue Sep 30 20:52:20 UTC 2008


I hate text messaging.....But.... It should be the same as on a cell 
phone. That is what will be expected by "younger" hams.

J = 5
K = 55
L = 555
5 = 5555

That is the way I am used to it, and for inter operability it should 
be the same as MOST telephones.

7 = PQRS7
9 = WXYZ9

The users of THD7's and the like (including myself) would just have 
to learn to deal with it. We should get Kenwood to change the 
Microphones on the models with cords!

Without a display (as in my cell phone) I would NEVER be able to keep 
up with sending a message via DTMF like this (That is me).

I think another issue is whether to have punctuation or not, and 
upper AND lower case, or just one or the other.

Cells phones normally try to be intelligent about this, but rarely 
are. I don't see how we could EVER use iTAP without a display!!!

Mark Cheavens
KC5EVE
At 03:28 PM 9/30/2008, you wrote:
> >> 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
>
>
>
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