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Wed Nov 18 21:02:00 UTC 2009


Prolific or FDTI chip sets seem to be least problematic.&nbsp;&nbsp; <br>
<br>
<hr width="100%" size="2"><br>
<br>
Of course, the simplest way around this issue is to use a sound card
interface that DOES NOT USE a serial port for PTT keying.&nbsp;&nbsp; My homebrew
version at:<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp; <a class="moz-txt-link-rfc2396E" href="http://wa8lmf.net/ham/tonekeyer.htm">&lt;http://wa8lmf.net/ham/tonekeyer.htm&gt;</a>&nbsp;&nbsp; <br>
<br>
or the TigerTronics "Signalink USB"&nbsp; <br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp; <a class="moz-txt-link-rfc2396E" href="http://tigertronics.com">&lt;http://tigertronics.com&gt;</a><br>
<br>
are two possibilities.&nbsp;&nbsp;&nbsp;&nbsp; <br>
<br>
My interface is essentially an external VOX system that keys the radio
whenever it hears tones from the computer soundcard.&nbsp;&nbsp;&nbsp; The
TigerTronics is actually an entire second sound system with built-in
interface, in a box at the end of a USB cable.&nbsp; When plugged in, it
"automagically" shows up in WinXP as a "Generic USB Sound System", with
no further drivers required.&nbsp; <br>
<br>
The advantage of this is that OTHER Windows activities that make sound
(boot up music, error messages, streaming media, etc) continue to come
out your original sound system, and don't go out over the air. Further,
you can set the TX and RX audio levels once on the Signalink second
sound system, and NOT have them messed up/reset by other sound-using
programs on the computer.&nbsp; <br>
<br>
<br>
<hr width="100%" size="2"><br>
--<br>
<br>
Stephen H. Smith&nbsp;&nbsp;&nbsp; wa8lmf (at) aol.com <br>
EchoLink Node:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; WA8LMF&nbsp; or 14400&nbsp;&nbsp;&nbsp; [Think bottom of the 2M band]<br>
Skype:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; WA8LMF<br>
Home Page:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a class="moz-txt-link-freetext" href="http://wa8lmf.net">http://wa8lmf.net</a><br>
<br>
NEW!&nbsp;&nbsp;&nbsp; Universal HF/VHF/UHF Antenna Mounting System<br>
&nbsp; <a class="moz-txt-link-freetext" href="http://wa8lmf.net/mobile/UniversalAntMountSystem.htm">http://wa8lmf.net/mobile/UniversalAntMountSystem.htm</a><br>
<br>
"APRS 101"&nbsp; Explanation of APRS Path Selection &amp; Digipeating <br>
&nbsp; <a class="moz-txt-link-freetext" href="http://wa8lmf.net/DigiPaths">http://wa8lmf.net/DigiPaths</a> <br>
<br>
Updated "Rev H" APRS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a class="moz-txt-link-freetext" href="http://wa8lmf.net/aprs">http://wa8lmf.net/aprs</a><br>
Symbols Set for UI-View, <br>
UIpoint and APRSplus:<br>
<br>
<br>
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