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<DIV><FONT face=Arial size=2>There is some project with DTMF control (reset TNC
and more) working with SP6VGA-2 digi by SQ6ADE.</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.aprs.pl/ftp/dtmfd.zip">http://www.aprs.pl/ftp/dtmfd.zip</A></FONT></DIV>
<DIV><FONT face=Arial size=2>Comments are in Polish, so if you are interested in
it, I can do translation for you.</FONT></DIV>
<DIV><FONT face=Arial size=2>73!</FONT></DIV>
<DIV><FONT face=Arial size=2>Andy AB9FX SP3LYR</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=lists.nospam@bpsmicro.com
href="mailto:lists.nospam@bpsmicro.com">Brad [VE3BSM]</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=aprssig@lists.tapr.org
href="mailto:aprssig@lists.tapr.org">'TAPR APRS Mailing List'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, February 06, 2006
18:56</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [aprssig] Wanted: tone-based
reset module schematics</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma size=2>One of the
digipeaters I upgraded to UIDIGI last summer had a small circuit card mounted
in the TNC. I didn't pay much attention at the time, but it turns out to be a
small reset circuit for the TNC. Basically, it listens on the audio input for
a specific tone for 2 seconds, at which point it trips the reset line of the
TNC. It's used to recover from a severe lockup of the TNC (which it turns out
UIDIGI sometimes suffers from). I had to use it once recently and it saved me
from a miserable hike up a snow-covered mountain.</FONT></SPAN></DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma size=2>I'd like to come
up with something similar for the other digis I maintain. But I haven't yet
found any schematics for anything *simple* that does the trick. I'm hoping
maybe somebody here has some schematics, or a pointer to a site with
some.</FONT></SPAN></DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma size=2>Failing that,
when Spring comes I'll hike up the mountain and reverse-engineer what's up
there, though that's not exactly my strong suit.</FONT></SPAN></DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma size=2>Emphasis on the
"simple". This one uses a single tone and I seem to recall it had one IC
(maybe two) and only a couple of discreet components. A DTMF decoder would do
the trick (and be less prone to spurious resets, presumably), but I really
don't have the ability to get into PIC-based designs.</FONT></SPAN></DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma size=2>Anybody seen
anything like this?</FONT></SPAN></DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma
size=2>Brad.</FONT></SPAN></DIV>
<DIV><SPAN class=950235000-07022006><FONT face=Tahoma
size=2>VE3BSM</FONT></SPAN></DIV>
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