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<a class="moz-txt-link-abbreviated" href="mailto:bruninga@usna.edu">bruninga@usna.edu</a> wrote:
<blockquote cite="mids40f500d.085@FSGWHUB.usna.edu" type="cite">
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<pre wrap="">"Wes johnston" <a class="moz-txt-link-rfc2396E" href="mailto:wes@kd4rdb.com"><wes@kd4rdb.com></a> 03/08/06 8:56 PM >>>
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<pre wrap="">I think the problem with the rinos is not the transmitter...
the probeml is twofold with receiver... squelch too tight,
and desense caused by close prox to GPS unit hash.
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<pre wrap=""><!---->
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Does the squelch setting affect data receive at all? I would have
assumed the data decode was taken directly off the discriminator,
before the squelch. <br>
<br>
<br>
<blockquote cite="mids40f500d.085@FSGWHUB.usna.edu" type="cite">
<pre wrap="">And #3 which is the receivers are 7 dB worse than
typical HAM front ends (my measurements on 3
of them)...
So putting a LNA in front of the APRS receiving
RINO should get at least that 7 dB back while also
picking up maybe 6 dB of external Antenna gain.
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Which will probably grossly overload the mediocre RX front end with
GMRS/FRS activity from all the other channels, not to mention the
numerous high-power paging systems that seem to plague every urban area
on 460 UHF, if you stick the radio up in the air with an external gain
antenna. <br>
<br>
I think the approach of mating the post-discriminator data-decoding
smarts from a Rhino carcass to the discriminator of a "real" radio
would be much more llkely to work. You could use the
discriminator-out pin ("9600 Baud Data")of the Mini-DIN6 data connector
of a D700 on UHF.....) Or a TM-708 which is the same radio minus the
TNC and APRS firmware. <br>
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<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
EchoLink Node: 14400 [Think bottom of the 2M band]<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.com">http://wa8lmf.com</a><br>
<br>
"APRS 101" Explanation of APRS Path Selection & Digipeating <br>
<a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/DigiPaths">http://webs.lanset.com/wa8lmf/DigiPaths</a> <br>
<br>
Updated 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>
<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>
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<br>
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