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<div class="moz-cite-prefix">On 5/26/13 11:10 AM, Brad NK8J wrote:<br>
</div>
<blockquote cite="mid:001801ce5a33$f1fc7890$d5f569b0$@juno.com"
type="cite">
<pre wrap="">Most Fire Stations and ambulances require DTMF Tones to tell them which
station is being sent out to where. </pre>
</blockquote>
Well, not exactly. The system here is "two-tone" which has one
single tone transmitted for a couple of seconds and then another
single tone for a couple of seconds. Precise timing I can look up
on Tuesday if needed. Google "two tone paging" for some of the
angles. <a class="moz-txt-link-freetext" href="http://www.batlabs.com/qcii.html">http://www.batlabs.com/qcii.html</a> has some of the info
although it doesn't cover what we use, nor several other variants.<br>
<br>
One of the tone plans out there is called "Plectron"; it's used in
the next county to the north. In this county we use the Motorola
tone plan. Here's a sample: The first column is Motorola's "hex
code" (why they call it that I don't know but that's what we put
into the dispatch console to specify the tone pairs), and the other
are the two tones sent in sequence. (Missing initial columns are
the various people's names and call signs.) One annoying thing
about Motorola's approach is that they include frequencies below 300
Hz and I have removed them whenever possible. Icom and Kenwood
radios can be set up to double as pagers but they don't work well
with 296.5 and basically don't work with 288.5<br>
<br>
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DTMF is another whole thing. It's one of many possibilities for
ARES paging that we need to figure out.<br>
<br>
HTH<br>
;B<br>
<pre class="moz-signature" cols="72">--
Bear Albrecht W5VZB
San Antonio, New Mexico</pre>
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