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<a class="moz-txt-link-abbreviated" href="mailto:scott@opentrac.org">scott@opentrac.org</a> wrote:
<blockquote cite="mid012701c525be$f77e7140$eacd0184@vandenberg.afspc.ds.af.mil" type="cite">
<blockquote type="cite">
<pre wrap="">(Channel "E" on analog cable systems lands almost directly on 144.39)
</pre>
</blockquote>
<pre wrap=""><!---->
Huh... my cable-ready TV only gets numbered channels.
</pre>
</blockquote>
In traditional analog cable systems, the first 12 channels (2-13) are
usually on the same frequencies as their off-the-air counterparts. To
carry more than 12 channels, the the cable operator starts filling in
the spectrum between the upper edge of the VHF low-band (channel 6
upper edge is 88MHz) and the lower edge of the VHF highband (channel 7
lower edge is 174MHz) with additional 6 MHz TV channels. <br>
<br>
These show up on your cable-ready tuner (or cable box) as channels
14-28 although their RF frequencies are totally different from the
channels 14-28 in the "real" over-the-air UHF band. [This is why
TVs/VCRs/etc have "cable" vs "antenna" selectors.] The reason for this
is to keep the added channels, sometimes referred to as "mid-band"
channels, in the VHF range instead of in the UHF range where the cable
losses would be far higher. ]<br>
Within the industry, these added channels that don't correspond to
actual RF channels are often designated with letters instead of
numbers. <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/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>
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