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<p><font face="Times New Roman, Times, serif">That would invalidate
the results through different rx performance if the objective is
to compare two TNCs.</font></p>
<p><font face="Times New Roman, Times, serif">Ray vk2tv</font><br>
</p>
<br>
<div class="moz-cite-prefix">On 27/10/17 13:11, Michael Barnes
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAAthHBYuHRHrJVds_9xaAqNYnAZRBTY_H4XA2vYr90pedgN2-Q@mail.gmail.com">
<div dir="ltr">
<div>For a receive only situation, I think I would scrounge up
an old scanner and have a completely separate receive setup.
You can find cheap programmable scanners for just a few
dollars. I keep several around for just such purposes.<br>
<br>
</div>
Michael WA7SKG<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Oct 26, 2017 at 12:41 PM,
spam8mybrain <span dir="ltr"><<a
href="mailto:spam8mybrain@yahoo.com" target="_blank"
moz-do-not-send="true">spam8mybrain@yahoo.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>Ah, but what if DireWolf is one of the TNC's he wants
to test? :-) It sounds like he wants to compare different
TNC's audio processing.
<div><br>
</div>
<div>Probably a larger issue here is if the TNC's being
compared demand different audio levels. Adjusting the
shared audio signal amplitude for best performance on
one TNC might ruin the performance of the other TNC
(signal lost in the noise or overloading and
clipping/distorting in the TNC's analog input). If you
really want to do this right, you might want to use an
audio distribution amplifier with independently
adjustable levels for each output feeding a TNC;
incidentally, this would also eliminate all issues of
loading down the input source.</div>
<div><br>
</div>
<div>Just my $.02.</div>
<div><br>
</div>
<div>Andrew, KA2DDO</div>
<div>
<div class="h5"><br>
<br>
-------- Original message --------<br>
From: "John D. Hays" <<a
href="mailto:john@hays.org" target="_blank"
moz-do-not-send="true">john@hays.org</a>> <br>
Date: 10/26/17 14:43 (GMT-05:00) <br>
To: Max Harper <<a href="mailto:kg4pid@yahoo.com"
target="_blank" moz-do-not-send="true">kg4pid@yahoo.com</a>>
<br>
Cc: aprssig <<a href="mailto:aprssig@tapr.org"
target="_blank" moz-do-not-send="true">aprssig@tapr.org</a>>
<br>
Subject: Re: [aprssig] Multiple TNC's connected to one
radio <br>
<br>
<div dir="ltr">It should work, but I can't vouch for
specific TNCs.
<div><br>
</div>
<div>Another approach would be to use Direwolf (<a
href="https://github.com/wb2osz/direwolf"
target="_blank" moz-do-not-send="true">https://github.com/wb2osz/<wbr>direwolf</a>)
which would give you more sampling opportunites.</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Oct 26, 2017 at
9:21 AM, Max Harper <span dir="ltr"><<a
href="mailto:kg4pid@yahoo.com" target="_blank"
moz-do-not-send="true">kg4pid@yahoo.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0
0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div>
<div
style="color:#000;background-color:#fff;font-family:Courier
New,courier,monaco,monospace,sans-serif;font-size:13px">
<div
id="m_6266834250169144174m_-3930541341492283968yui_3_16_0_ym19_1_1509030042854_4795"
dir="ltr"> I would like to connect 2 tnc's
to one radio. One would be
transmitt/recieve and the other recieve
only. This would be to test the decoding
of a couple different tnc's. Am I likely
to run into any problems connecting the
speaker jack audio into 2 tnc's? Would the
additional load cause me to have to
readjust the audio level when I
connect/disconnect the second tnc? My
thoughts are since the speaker jack audio
is low impedance (8 ohm) and the tnc input
is much higher (hopefully) is that it will
have little to no effect. </div>
<div
id="m_6266834250169144174m_-3930541341492283968yui_3_16_0_ym19_1_1509030042854_4796"><br>
</div>
<div
id="m_6266834250169144174m_-3930541341492283968yui_3_16_0_ym19_1_1509030042854_4797">Just
thought I'd ask before wasting my time
making a cable.</div>
<div
id="m_6266834250169144174m_-3930541341492283968yui_3_16_0_ym19_1_1509030042854_4813"><br>
</div>
<div
id="m_6266834250169144174m_-3930541341492283968yui_3_16_0_ym19_1_1509030042854_4798">Max
KG4PID </div>
</div>
</div>
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<div
style="float:left;padding-left:1em"><font><font><font
color="#0000ff">John D.
Hays</font><br>
<font color="#000000">Edmonds,
WA</font></font></font></div>
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