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<a class="moz-txt-link-abbreviated" href="mailto:dave@emv.co.uk">dave@emv.co.uk</a> wrote:<br>
<blockquote cite="midDEBD8C80076A674BAD506D37CDFA4FAB575551@server.emv.local" type="cite">
<pre wrap="">
The track numbering is a bit odd. Track 1 is very short and blank,
track two announces itself as "Track One" , track 3 announcement is
"Track Two" and so on....
The "De-emphasised" audio is "very" muffled, compared to what comes out
of the rig speaker jacks hear in the UK. I'm not aware of any US/EU
differences in Ham FM radio charactersisics, but I suspect some TNC's
will struggle with the "De-emphasised" tracks, where as they will work
just fine with a real FM radio speaker jack feed. I have a collection
of TNC-220's, none have a problem with radio speaker feeds, so long as
you load the radio with say a 10r resistor, and that's more like keeping
the radio's speaker output chip bias point in the right place.
The "Non de-emphasised" audio examples are as expected very "bright" to
say the least.
</pre>
</blockquote>
<br>
I have added this to the TNCtest index page at:<br>
<br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/TNCtest/index.htm">http://wa8lmf.net/TNCtest/index.htm</a><br>
<br>
just above the file download links.<br>
<br>
"
<h2 align="center"><font color="#ff0000" face="Verdana">READ THIS FIRST
!!!</font></h2>
<p><font color="#111111" face="Verdana">The image file you download
produces a <u><b>MIXED MODE</b></u> disk that combines CD-ROM data and
audio CD tracks. </font></p>
<ul>
<li><font color="#111111" face="Verdana"><u>This is not a normal
CD_ROM.</u><br>
</font></li>
<li><u><font color="#111111" face="Verdana">This is not a normal
audio CD.<br>
</font></u></li>
<li><font color="#111111" face="Verdana">It is a combination of the
two. When you place this disk in a computer CD drive, you will only
see the CD-ROM data part of the disk. <u><b>The audio tracks will NOT
show, and will NOT automatically start playing.</b></u> </font></li>
</ul>
<p><font color="#111111" face="Verdana">Go to the Windows Start menu
and do Start -- Programs -- Accessories -- Entertainment, and select
the "CD Player" applet. You will get an on-screen display that looks
like a car stereo CD player with start, stop and track select buttons
and a volume control. Use this software "device" to play the audio
tracks. </font> </p>
<p><font color="#111111" face="Verdana">In a non-computer audio player
such as a boombox or DiskMan (or a CD-ROM drive being used stand-alone
outside of a computer), the drive may mistakenly see the first (data)
track as a defective unplayable audio track and do nothing. If so, use
the track selector button to jump to the next (first actual audio)
track.</font></p>
<p><font color="#111111" face="Verdana"><br>
</font></p>
<p><font color="#111111" face="Verdana">The de-emphasis on track 2
sounds muddier than most radios because the de-emphasis in most radios
doesn't conform to the official de-emphasis curve. Many radios don't
even begin to roll off until 1K or higher rather than starting at 300
Hz, in an effort to have "punchier" audio. The recording reflects
"worse case" de-emphasis roll-off . <br>
</font></p>
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