[aprssig] APRS Voice links?

Mike Goldweber mike at mikegoldweber.name
Mon May 20 21:40:49 CDT 2013


Hi Bob,

Thanks for mentioning those points. I'll check out the link. This sounds 
interesting.

Thanks,
Mike
KB3IXO


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On May 20, 2013 9:16:05 AM Robert Bruninga <bruninga at usna.edu> wrote:
> Mike,
>
>
>
> You might want to read the 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] *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>
> Date: Sun, May 19, 2013 1:08 pm
> To: aprssig at tapr.org
> Cc: 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* <http://aprs.org/avrs.html>
>
>
>
> Maybe this new FreeDV can serve as a spark for some new thinking…
>
>
>
> Bob, Wb4APR
>
>
> ------------------------------
>
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