<div dir="ltr"><div><div>Just last saturday, we demonstrated 9600 baud links over 500 miles from North Carolina to NY (6 links) as part of the annual Appalachian Trail Golden Packet event. All the links worked at 9600 just as well as at 1200 baud. Although it was only a few hour test, we do want to make the link permanent using level 4 packet nodes.<br><br></div>9600 baud doesnt do much for APRS as the individual packet overheat and TXD delay only provides about a factor of 2. But for file transfer, of bulk data the speed really pays off. Since 9600 baud is built into every Kenwood APRS radio its time to do something with it...<br><br></div><div><a href="http://www.aprs.org/ec9600net.html">http://www.aprs.org/ec9600net.html</a><br><br></div>Bob, WB4APR<br><div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jul 18, 2016 at 4:04 AM, SARTrack Admin via aprssig <span dir="ltr"><<a href="mailto:aprssig@tapr.org" target="_blank">aprssig@tapr.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">This is a bit off topic, but I have been asked (and not for the first time) if there is a way to do emergency communications on VHF/UHF at reasonably medium to higher speed.<br>
My SARTrack software can do some of the work via APRS, but due to the connectionless state, it is not very suitable for reliabe transfer of critical data, and it is way to slow.<br>
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I have users who are now looking at DMR for data transfers (because they already use commercial DMR radios for Voice and GPS location data) but these radios are by default very narrow-band, and are aiming more towards the 6.26 kc bandwidth than to 25 kb bandwidth, let alone more.<br>
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What we really need is a fully digital VHF or UHF radio modem, which enables us to do make one-to-one connections, and possibly some kind of one-to-many data transfers.<br>
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Looking at the TAPR website, most of the things I find there are very old. I would like to find some kind of system which uses the latest technologies to get the most data over a bandwidth which can still be used in VHF/UHF.<br>
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If there is a mailing list more suitable for this topic, please let me know.<br>
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Thanks,<br>
<br>
Bart ZL4FOX<br>
<a href="http://www.sartrack.nz/" rel="noreferrer" target="_blank">http://www.sartrack.nz/</a><span class=""><font color="#888888"><br>
<br>
-- <br>
Bart Kindt<br>
SARTrack Developer and CEO<br>
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