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<a class="moz-txt-link-abbreviated" href="mailto:bruninga@usna.edu">bruninga@usna.edu</a> wrote:
<blockquote cite="mids37e4600.044@FSGWHUB.usna.edu" type="cite">
<pre wrap="">Scott says:
</pre>
<blockquote type="cite">
<pre wrap="">This might interest you [for an APRS TX kit]
<a class="moz-txt-link-freetext" href="http://www.sarl.org.za/forum/topic.asp?TOPIC_ID=249">http://www.sarl.org.za/forum/topic.asp?TOPIC_ID=249</a>
</pre>
</blockquote>
<pre wrap=""><!---->
Please tell him to keep it at 12 watts and don't
cut it back to 5W!
The duty cycle of an APRS transmitter even at
30 second rate is less than 3%. Thus the
12 watt device (probably takes 25W DC
input power) but at 3% dutycycle this is only
an average device dissipation of 750 mW
and can easily be dissipated by just the
PCB.
</pre>
</blockquote>
<br>
This translates into a continuous drain of 83mA from a 9V battery!
Obviously not practical. <br>
<br>
Looks like a high-power PT would have to be in a substantially larger
box in order to accomodate a much larger battery. But then, at
least, one could easily add the 60mA drain of a GPS-18 or similar. <br>
<br>
<br>
<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>
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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