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[aprssig] DTMF encoding

Robert Bruninga bruninga at usna.edu
Wed Oct 1 15:58:07 UTC 2008


The D7 and D700 do not use pauses.  When you change keys (in the
multi-press system), then that means you are moving on to the
next letter.  If the next letter is on the same key, then you
press the right-shift button ("A" key) or the RIGHt Joystick
button.   Now here is the amazing part.  In the D710, kenwood
changed the right-shift function to the "C" key.

Bob

> I'm confused... about how using nnnn can 
> actually get the right letter without programming 
> pauses into the stream?  For instance:
> 
> 5554444337775 = KJ4ERJ or was that L4ERJ or JJJ4ERJ?
> 
> Without a display to latch on the letter and move the cursor
on the 
> pause, the person driving the keyboard has no clue.  Even
worse (and 
> this is the 'nixer, I suspect) without coding the pauses INTO 
> THE DTMF 
> STREAM, there's no way that I know of for the receiver to 
> know what was 
> actually entered.
> 
> I was actually leaning in favor of this approach until he 
> brought this 
> up.  Seems like the EchoLink folks might have something going 
> with the 
> statement that EVERY keystroke is 2 digits.
> 
> 525140327351 = KJ4ERJ is deterministic at least.  You could 
> even extend 
> it to cover lower-case should anyone really want to do such a
thing.
> 
> 525140357654 = KJ4erj based on hitting the E key 5 times 
> (DEFdef) and so 
> forth (76=PQRpqr 54=JKLjkl)
> 
> Lynn (D) - KJ4ERJ - Adding my $0.02 for whatever it's worth.
> 
> PS.  I really have trouble with the enter and pause with my 
> last name.  
> There's at least once voice response system out in IRS 
> (Internal Revenue 
> Service, the US tax guys) that requires me to touch tone the
first 5 
> characters of my last name....
> 
> DEFFE = 3...33...333...333...33# - Positively painful!
> 
> jimlux wrote:
> > Bear in mind when talking about multiple key presses that 
> most devices 
> > that use this have some sort of visual feedback (e.g. an 
> alphanumeric 
> > display).  I'd hate to have anything like this with no 
> feedback.  Hence 
> > directory lookup interactive voice response systems that ask
you to 
> > enter the name using a single digit for each letter (using 
> the 2=ABC 
> > scheme).. Hopefully that "hashes" to a unique identifier 
> that allows the 
> > lookup to work. If not, they disambiguate by asking you "do 
> you mean A 
> > (press 1) or B (press 2)"
> >
> >
> > Jim, W6RMK
> >
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> > aprssig at lists.tapr.org
> > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> >
> >   
> 
> 
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