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<div class="moz-cite-prefix">On 10/30/2012 1:13 PM, Aaron Wolfe
wrote:<br>
</div>
<blockquote
cite="mid:CAA6uQZREnLSwJKqSB=_paQfMKhKEmUz1rVqZHkDho2WgSxpqaw@mail.gmail.com"
type="cite">
<pre wrap="">On Tue, Oct 30, 2012 at 1:01 PM, Stephen H. Smith <a class="moz-txt-link-rfc2396E" href="mailto:wa8lmf2@aol.com"><wa8lmf2@aol.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">OR - is your concern that UZ7HO has written a soundcard engine and that
provides the same TCP/IP interface as AGWPE?
Exactly! The UZ7HO "Soundmodem" replaces AGWpe itself, and faithfully
mimics the TCP/IP interface of AGW. Any program such as UIview, APRSpoint,
APRS+SA, Winlink, etc that can link to AGW as a soundcard TNC can use the
Soundmodem instead with NO changes at all.
</pre>
</blockquote>
<pre wrap="">
Sounds good to me. Why is this a bad thing, and who is it bad for?
</pre>
</blockquote>
<br>
It can potentially reduce the sales for George's AGW Packet Engine
Pro edition - the pay-for version of AGW commonly referred to as
"PEpro". <br>
<br>
For 300 baud HF operators, PEpro offers a significant advantage over
the freeware basic version of AGWpe. <br>
<br>
The free AGWpe only offers the 2100/2300 Hz tone pair for HF
operation which can be problematic with some HF/SSB transceivers
with very restricted bandpass filters. (The audio high-frequency
response doesn't go high enough if the radio lacks a dedicated data
mode that shifts the IF bandpass higher than that normally used for
voice operation.) Even if the 2300 Hz tone just barely gets through
the IF bandpass at it's upper edge, it will usually be subject to
phase-shift and group-delay distortion relative to the lower 2100 Hz
tone.<br>
<br>
PEpro offers a choice of either the classic 2100/2300 Hz tones, -or-
the lower 1600/1800 Hz "KAM-standard" tones guaranteed to get
through the IF bandpass of any HF/SSB transceiver without
problems. (1600/1800 Hz tones are well within the center of the
SSB passband and suffer a minimum of phase-shift and group-delay
problems.)<br>
<br>
<br>
The FREEWARE UZ7HO Soundmodem does this one better by offering
fully tunable audio tone pairs that can be set to ANY frequency on a
water fall display, similar to typical PSK apps, or MixW. This
even allows you to choose a 200-Hz-shift tone pair that will match
the bandpass of the typical 500 Hz CW filter (typically centered
around 700-1000 Hz) for the ultimate in weak-signal operation on
HF. <br>
<br>
[My 30-meter APRS igate is using UZ7HO with an elderly Kenwood
TS-440. Using the 500 Hz CW filter instead of the normal 2300 Hz
SSB filter makes a DRAMATIC difference in copy when signals are weak
or the band is noisy on 30!] <br>
<br>
<br>
<hr size="2" width="100%"><br>
--<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
Skype: WA8LMF<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.net">http://wa8lmf.net</a><br>
<br>
<br>
High-Performance Software-Only Packet TNC <br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/miscinfo/UZ7HO-Soundmodem-Install-Ver-0.45-Beta.exe">http://wa8lmf.net/miscinfo/UZ7HO-Soundmodem-Install-Ver-0.45-Beta.exe</a><br>
<br>
High Quality Calibrated Static Maps for Any APRS App <br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/aprs/PM9_StaticMap_Export.htm">http://wa8lmf.net/aprs/PM9_StaticMap_Export.htm</a><br>
<br>
Vista & Win7 Install Issues for UI-View and Precision Mapping<br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7">http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7</a><br>
<br>
<br>
"APRS 101" Explanation of APRS Path Selection & Digipeating <br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/DigiPaths">http://wa8lmf.net/DigiPaths</a> <br>
<br>
<br>
<br>
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