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[aprssig] APRS Calling

Robert Carleton rbc at rbcarleton.com
Sun Oct 21 19:52:43 UTC 2012


Bob,

Thanks for your reply. The AVRS concept definitely goes much further than my APRS calling procedure. I was just trying to implement a simple procedure using very basic facilities of APRS. When we try to get volunteers for events, we don't have much control over the kinds of equipment they bring. I was trying to support using very basic APRS systems during times when the telecommunications grid is unavailable.

On the other hand, AVRS is a much better idea. I hope to see it more widely implemented.

Best,

			--Bruce


On Oct 21, 2012, at 11:51 AM, Robert Bruninga wrote:

>> I've been working on a simple procedure for calling stations
>> via APRS text messages as an alternative to voice calling....
> 
> This has been the #1 focus of APRS since 2001 when we came up with the
> AVRS concept.  See http://aprs.org/avrs.html
> 
> You want to talk to someone anywhere on the planet, you send him a QSO
> message and then the AVRS engine makes the connection via Echolink,
> IRLP or Dstar or any other system.
> 
> Everything is in place EXCEPT the Dstar, the Echolink and IRLP
> gateway.  Even Kenwood and Yaeus have built-in the auto-QSY feature at
> the push of a button.  John Gorkos has writen a preliminary AVRS
> engine that will tell you where the VOIP node are, but we still dont
> have the automatica AVRS engine to glue it all together.
> 
> Bob, WB4APR
> 
> On Sun, Oct 21, 2012 at 2:12 PM, Robert Carleton <rbc at rbcarleton.com> wrote:
>> I've been working on a simple procedure for calling stations via APRS text
>> messages as an alternative to voice calling. I thought I'd float it with the
>> APRS community for comment.
>> 
>> APRS calling borrows ideas implemented in Digital Selective Calling, a part
>> of the Global Maritime Distress Safety System. The idea is to replace
>> monitoring voice calling frequencies with APRS monitoring. APRS calling
>> provides procedures for contacting stations that are operating APRS, but not
>> monitoring voice. ITU Q codes are used in conjunction with APRS text
>> messages to implement APRS calling.
>> 
>> 1) The calling station sends a QSX signal to the station or group they wish
>> to reach using an APRS text message. The QSX should include the frequency
>> for voice contact. The calling station may wish to include offset and CTCSS
>> or DCS information.
>> 2) The called station or stations reply with an answering QSX via an APRS
>> text message.
>> 3) The stations shift communications to the arranged voice channel.
>> 
>> That's the whole thing. I'd be grateful for any feedback.
>> 
>> Best,
>> 
>> --Bruce (KJ6VVJ)
>> 
>> 
>> Robert "Bruce" Carleton
>> Emergency Coordinator
>> NALCO ARES/RACES
>> 
>> 
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> 
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