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<a class="moz-txt-link-abbreviated" href="mailto:archer@eskimo.com">archer@eskimo.com</a> wrote:
<blockquote cite="midPine.SUN.4.58.0507070852080.3072@eskimo.com" type="cite">
<pre wrap="">On Thu, 7 Jul 2005, Phillip B. Pacier wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Robert Bruninga wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Same here. We did extensive tests with 4 different
radios over 200 feet separation using lab attenuators
and a very long run of RG58 to eliminate any chance
of leakage. The diffrence was 7 dB. So it takes
50W at 9600 to equal 10W at 1200 baud. Or
about half the range.
</pre>
</blockquote>
<pre wrap="">I have heard you say this before, and we have just not found this to be
the biblical case here in southern California. Mobile works fine.
Distance from station to station is the killer. Maybe it's the
soil....maybe it's the earthquakes... it just works here. :)
</pre>
</blockquote>
<pre wrap=""><!---->
Might part of this be the different pre-emphasis used on some of the
9600 baud rigs/TNC's? I recall that being a problem. Or was that
just the 1200 baud pre-emphasis on the Kenwoods that was different?
</pre>
</blockquote>
.<br>
There IS NO pre-emphasis on the Kenwoods tx at all! The tones are fed
directly into the modulator "flat", even at 1200. These two links are
audio recordings captured directly off the discriminator "demod out"
jack of an IFR-1500 communications monitor with all RX equalization
switched off, as seen in the CoolEdit (a.k.a. Adobe Audition) audio
editor:<br>
<br>
<a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/1-Mic-E-Burst.gif">http://webs.lanset.com/wa8lmf/1-Mic-E-Burst.gif</a><br>
<a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/Mic-E-Burst-Extreme-Closeup.gif">http://webs.lanset.com/wa8lmf/Mic-E-Burst-Extreme-Closeup.gif</a><br>
<br>
Note that there is even a slight high-frequency rolloff - the high tone
is actually slightly LOWER in level. The grass at the extreme left and
right of the first one is the no-signal unquieted open-squelch
background noise level. <br>
<br>
<br>
<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.com">http://wa8lmf.com</a><br>
<br>
New APRS Symbol Chart <br>
<a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/miscinfo/APRS_Symbol_Chart.pdf">http://webs.lanset.com/wa8lmf/miscinfo/APRS_Symbol_Chart.pdf</a> <br>
<br>
New/Updated "Rev G" APRS <a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/aprs">http://webs.lanset.com/wa8lmf/aprs</a><br>
Symbols Set for UI-View, <br>
UIpoint and APRSplus:<br>
<br>
<br>
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