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<div class="moz-cite-prefix">On 12/4/2019 10:04 AM, Robert Bruninga
wrote:<br>
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<p style="margin-left:.5in"><span
style="font-family:Wingdings;color:#1f497d"><span
style="mso-list:Ignore">Ø<span style="font:7.0pt
"Times New Roman""> </span></span></span>By
the way, the D700 TNC is a REALLY mediocre-performing device
as well<span style="color:#1f497d">.</span> In several test
runs, Direwolf and the UZ7HO "Soundmodem" software TNCs copied
almost THREE times as many beacons as the D700 hardware TNC.
</p>
<p><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The
problem in this case was what was doing the transmitting? A
typically non-tweaked packet transmitter can be FULL Scale
on a kenwood and some other TNC’s and not decoded. But a
properly balanced packet can be fully dedoded on a kenwood
down to only 3 bars on the s units.</span></p>
<p><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The
problem is that 90% of all packets on the air were never
properly tweaked for optimum performance. Just put it up
and it works! (but fails miserably in weak signals).</span></p>
<p><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Repeat
your test with a kenwood doing the transmitting (known
factory good signal) and a kenwood doing the receiving and
you will see an order of magnitude improvement in
performance comparted to most signals on the air.</span></p>
</div>
</blockquote>
<p> </p>
<p>Are you then suggesting that only Kenwood devices be allowed in
organized APRS activities??? </p>
<p><br>
</p>
<p>In this test, the transmitter ("ammo-box" tracker) was a
TinyTrack III connected to a Yaesu FT-1500 2-meter monobander's
6-pin mini-DIN data port. The FT-1500's data port yields flat
(not pre-emphasized) TX audio response, just like a D700. The
transmitting FM deviation was monitored and set to exactly 3.5
KHz peak, using my IFR-1500 communications service monitor. <br>
</p>
<p>This test reflected the receive decode performance of signals
sent from a single transmitting device. In casual monitoring
while on cross-country road trips, listening to many different
transmitters from different users, some fully-quieted and some
noisy & scratchy, I see the same pattern. It is clear that
the soundcard soft TNCs, fed raw discriminator audio from the
mini-DIN data port, are far more tolerant of malformed,
over-deviated, under-deviated, incorrectly equalized, or just
plain weak and noisy TX signals than the D700's own TNC. <br>
</p>
<p>In the real world, the great majority of APRS signals are being
originated by NON-Kenwood devices, with a wide range of optimal
and not-so-optimal settings that you have no control over.
Having a demodulator that can tolerate these marginal signals
successfully is a HUGE advantage.<br>
</p>
<p>This is NOT a case of the D700 transmitter somehow being
magically "tweaked". It is a case of the D700 hardware TNC being
an inferior DECODER of marginal real-world signals than the
soundcard software TNCs. <br>
</p>
<hr width="100%" size="2">Stephen H. Smith wa8lmf (at) aol.com <br>
Skype: WA8LMF<br>
EchoLink: Node # 14400 [Think bottom of the 2-meter band]<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.net">http://wa8lmf.net</a><br>
<br>
----- NEW! 60-Meter APRS! HF NVIS APRS Igate Now Operating
------<br>
<a class="moz-txt-link-rfc2396E" href="http://wa8lmf.ddns.net:14447/"><http://wa8lmf.ddns.net:14447/></a><br>
<br>
<br>
<br>
Live Off-The-Air APRS Activity Maps<br>
<a class="moz-txt-link-rfc2396E" href="http://wa8lmf.net/map"><http://wa8lmf.net/map></a><br>
<br>
Long-Range APRS on 30 Meters HF <br>
<a class="moz-txt-link-rfc2396E" href="http://wa8lmf.net/aprs/HF_APRS_Notes.htm"><http://wa8lmf.net/aprs/HF_APRS_Notes.htm></a><br>
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