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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoPlainText">At Dayton there was a lot of excitement about FREE Digital Voice (FreeDV)</p><p class="MsoPlainText"> </p>
<p class="MsoPlainText">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).</p>
<p class="MsoPlainText"> </p><p class="MsoPlainText">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...</p>
<p class="MsoPlainText"> </p><p class="MsoPlainText">This would give experimenters a chance to see what we can do with Digital Voice using existing AX.25 links.</p><p class="MsoPlainText"> </p><p class="MsoPlainText">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.</p>
<p class="MsoPlainText"> </p><p class="MsoPlainText">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">http://aprs.org/avrs.html</a></p>
<p class="MsoPlainText"> </p><p class="MsoPlainText">Maybe this new FreeDV can serve as a spark for some new thinking…</p><p class="MsoPlainText"> </p><p class="MsoPlainText">Bob, Wb4APR</p><p class="MsoPlainText"> </p></div>
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