[aprssig] APRS Voice links?
Kristoff Bonne
kristoff.bonne at skypro.be
Tue May 21 16:10:17 EDT 2013
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?
73
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, WB4APR
>
> *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 once.
>
> 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 channel.
>
> 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
>
> KB3IXO
>
> -------- 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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