[aprssig] APRS Voice links?

Robert Bruninga bruninga at usna.edu
Tue May 21 16:20:54 EDT 2013

The ultimate goal of AVRS has always been to allow making contact with
someone while mobile (anywhere in the world) by only knowing his callsign.
All you do is send an APRS message to "AVRS" identifying the called party,
and you (and he) get an APRS message QSYING your Radios to the designated
VOIP link (IRLP, Echolink, Allstar or whatever) and you talk.

All the set-up and connections of the VOIP are done by the AVRS engine
sitting somewhere on the internet but with tentacles into APRS, Echolink,
IRLP and Allstar info).  Both Kenwood and Yaesu have already added the QSY
capability to their radios so that all you have to do is push a TUNE or
QSY button (automatic will come later as the system grows)...

Bob, WB4aPR

-----Original Message-----
From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
Of Kristoff Bonne
Sent: Tuesday, May 21, 2013 4:10 PM
To: aprssig at tapr.org
Subject: Re: [aprssig] APRS Voice links?

Hi Robert,

Perhaps it is me but I am a bit lost here.

What exactly is the goal of avrs?
Is it like Jingle/XMPP, a signaling protocol for voice communication,
running on top of (in this case) APRS?

Or am I missing something here?

kristoff - ON1ARF

On 20-05-13 15:16, Robert Bruninga wrote:
> Mike,
> You might want to read the http://aprs..org/avrs.html
> <http://aprs.org/avrs.html> page.  It really has nothing to do with
> adding voice over APRS.  It has to do with organizing amateur radio
> voice systems so that the interactive front panel of the APRS radio
> which has global callsign-to-callsign connectivity may be used to
> -setup- a callsign-to-callsign voice connection with the only knowledge
> needed by the caller or callee is a callsign.  Hope that helps.  Bob,
> *From:*aprssig-bounces at tapr.org
> <mailto:aprssig-bounces at tapr.org>
> [mailto:aprssig-bounces at tapr.org
> <mailto:aprssig-bounces at tapr.org>] *On Behalf Of
> *Mike Goldweber
> *Sent:* Sunday, May 19, 2013 6:27 PM
> *To:* TAPR APRS Mailing List
> *Subject:* Re: [aprssig] APRS Voice links?
> At the risk of being a debbie downer, I would ask what is gained by
> adding voice to APRS?    On the internet side of the equation I do see
> the value of some value to his, and there probably isn't any real down
> side; but as Bob pointed out there is a number of ways to talk VoIP
> already.  Multitasking OS's give us the means to run several programs at
> once, letting someone do APRS-IS as well as Echolink and DStar all at
> On the radio side of APRS, I see the potential for problems. I believe
> adding voice data could potentially add a lot of data being sent, which
> could prevent the usual stream of data from moving properly. My interest
> in APRS came about from my involvement with emergency communications.
> Our area has well defined voice channels set up, but we only use a
> single channel for APRS.  The frequencies used for voice are organized
> in such a way to prevent problems with too much chatter.  Currently,
> there isn't a problem getting the APRS data, but adding voice to the mix
> could change that if everyone were to begin talking over the APRS
> Frankly, given the amount of bandwidth devoted to voice over VHF, I
> don't see the advantage of having a voice-over-APRS.
> Best Regards,
> Mike Goldweber
>     -------- Original Message --------
>     Subject: [aprssig] APRS Voice links?
>     From: Robert Bruninga <bruninga at usna.edu
>     <mailto:bruninga at usna.edu>>
>     Date: Sun, May 19, 2013 1:08 pm
>     To: aprssig at tapr.org
>     <mailto:aprssig at tapr.org>
>     Cc: aprs at yahoogroups.com
>     <mailto:aprs at yahoogroups.com>
>     At Dayton there was a lot of excitement about FREE Digital Voice
>     (FreeDV)
>     Although it is currently being applied to robust HF communications
>     at about 1200 baud in a 3 KHz channel, the basic Vocoder  works at
>     about 1000 baud or as low as 800 bits if the data stream is error
>     protected. (Ie inside an AX.25 connected packet).
>     At the risk of exposing my ignorance, I wonder how close we could
>     get to relaying the raw Vocoder over an AX.25 link using our
>     existing 9600 baud modems built into the Kenwoods?   Even with the
>     slow TXD delays (500 ms!) in Kenwood 9600 baud modems, a
>     conversation could be continuous if the radio was transmitting this
>     information at 9600 baud in packets once a second maybe...
>     This would give experimenters a chance to see what we can do with
>     Digital Voice using existing AX.25 links.
>     I have no idea what a network would look like, but if IGates could
>     receive these 9600 baud connections, then it would seem like we
>     could cobble together some kind of A-STAR system where we use the
>     frton panel controls and APRS to set up who we want to talk to and
>     then the IGates link us  between any two hams anywhewre on the
>     planet along with their APRS traffic.
>     Anyway, a whole new exciting area to think about.  Remember, it has
>     always been my goal to have callsign-to-callsign voice contact
>     (using APRS connectivity to set up the call).  At first I thought
>     IRLP, then Echolink, then ALL-STARR would be the answere.  Then
>     D-star actally is now doing it, and we still have not gotten
>     organized to simply take what we have and do it too.  See
>     _http://aprs.org/avrs.html_
>     Maybe this new FreeDV can serve as a spark for some new thinking.
>     Bob, Wb4APR
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