[aprssig] Text Messaging Radios (a simple use)

Scott Miller scott at opentrac.org
Thu Feb 12 15:40:49 CST 2009

If we're going to make a device that has the connections to the radio to 
receive DTMF and display it on an LCD, why not just make it a text 
messaging terminal and have it use APRS?


Wes Johnston, AI4PX wrote:
> I could kinda see where I could program my DTMF memories in advance... 
> memory 1 would be priority 1 traffic indication (with my callsign 
> embedded), mem 2 would be priority 2, etc.  Then I'd just key up and 
> send DTMF memory 1 if I had hi priority traffic.  Of course teh next 
> question is how long does this DTMF sequence take?  1.6 seconds at most, 
> right?  16 digit dtmf memory at a speed of 10 digits per second?  It 
> would take a little longer than blurting out your 3 letter suffix by 
> voice, but would convey more info...... however.... if I had real 
> emergency traffic, I'd still butt in and call netcontrol on voice.  
> Routine and hi priority traffic... I would not mind sitting by and 
> letting netcontrol get around to me.
> Someone mentioned the display time out.  How long does my code stay on 
> the display of one of these radios?  What happens when it's overwritten 
> by the next guy looking to pass traffic.  Seems to me that if we had a 
> PIC, DTMF decoder and 20x4 LCD display, we could have a message logging 
> tablet which would show 4 calls at once.... and you could scroll between 
> them if too many came in at once.  Such a device could / would sort the 
> calls by priority and allow netcontrol operator to erase them once he'd 
> addressed that station.
> Just my thoughts.
> On Thu, Feb 12, 2009 at 2:18 PM, Scott Miller <scott at opentrac.org 
> <mailto:scott at opentrac.org>> wrote:
>      > Yes, if this catches on, I am sure that Byonics, OpenTrack of
>      > HAMHUD would find it useful to add the DTMF decoder to their
>      > displays.  The real advantage is being able to include 100% of
>      > every volunteer at your event in the ability to send simple text
>      > data to net control.
>     I'm still not following how this is going to be more useful than voice.
>      Can someone shoot a quick video of this in use?
>     Scott
>     N1VG
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> -- 
> Wes
> ---
> Where there's silence, there is no Hope.
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