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<p>Hi Bob, <br>
<br>
Thanks for mentioning those points. I'll check out the link. This
sounds interesting.<br>
<br>
Thanks,<br>
Mike<br>
KB3IXO<br>
<br>
<br>
Sent with AquaMail for Android<br>
<a href="http://www.aqua-mail.com">http://www.aqua-mail.com</a></p>
<br><p>
<p>On May 20, 2013 9:16:05 AM Robert Bruninga <bruninga@usna.edu> wrote:</p>
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--></style></head><div class="WordSection1"><p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Mike,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p
class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">You
might want to read the <a href="http://aprs.org/avrs.html"><span
style="color:windowtext">http://aprs.org/avrs.html</span></a> 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</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><div><div
style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p
class="MsoNormal">
<b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a>
[mailto:<a
href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a>] <b>On
Behalf Of </b>Mike Goldweber<br>
<b>Sent:</b> Sunday, May 19, 2013 6:27 PM<br><b>To:</b> TAPR APRS Mailing
List<br><b>Subject:</b> Re: [aprssig] APRS Voice
links?</span></p></div></div><p class="MsoNormal"> </p><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">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.</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">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. </span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">Frankly,
given the amount of bandwidth devoted to voice over VHF, I don't see
the advantage of having a voice-over-APRS.</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">Best
Regards,</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">Mike
Goldweber</span></p></div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">KB3IXO</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">
</span></p>
</div><blockquote
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<span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">--------
Original Message --------<br>Subject: [aprssig] APRS Voice links?<br>From:
Robert Bruninga <<a href="mailto:bruninga@usna.edu"><span
style="color:windowtext">bruninga@usna.edu</span></a>><br>
Date: Sun, May 19, 2013 1:08 pm<br>To: <a
href="mailto:aprssig@tapr.org"><span
style="color:windowtext">aprssig@tapr.org</span></a><br>Cc: <a
href="mailto:aprs@yahoogroups.com"><span
style="color:windowtext">aprs@yahoogroups.com</span></a></span></p>
<div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">At
Dayton there was a lot of excitement about FREE Digital Voice
(FreeDV)</span></p></div><div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">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).</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">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...</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">This
would give experimenters a chance to see what we can do with Digital Voice
using existing AX.25 links.</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">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.</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">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
<a href="http://aprs.org/avrs.html" target="_blank"><u><span
style="color:blue">http://aprs.org/avrs.html</span></u></a></span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">Maybe
this new FreeDV can serve as a spark for some new thinking…</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p
class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">Bob,
Wb4APR</span></p>
</div><div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div></div><div
class="MsoNormal" align="center" style="text-align:center"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"><hr
size="2" width="100%" align="center">
</span></div><p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">_______________________________________________<br>aprssig
mailing list<br><a href="mailto:aprssig@tapr.org"><u><span
style="color:blue">aprssig@tapr.org</span></u></a><br>
<a href="http://www.tapr.org/mailman/listinfo/aprssig"><u><span
style="color:blue">http://www.tapr.org/mailman/listinfo/aprssig</span></u></a></span></p></div></blockquote></div>
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