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In the case of the original GPS design, two frequencies are utilized; one
at 1575.42 <a href="http://en.wikipedia.org/wiki/MHz">MHz</a> (10.23 MHz
× 154) called L1; and a second at 1227.60 MHz (10.23 MHz × 120), called
L2. <br><br>
L1 is used by civilian GPS units.<br>
L2 is used by military in addition to L1.<br>
L2 can also be used by some civilian GPS units in addition to the L1
signal.<br><br>
There are five channels on the most modern GPS birds.<br><br>
See
<a href="http://en.wikipedia.org/wiki/GPS_signals" eudora="autourl">
http://en.wikipedia.org/wiki/GPS_signals</a> for their utilization
and additional information.<br><br>
73<br>
Glenn<br>
WB4UIV<br><br>
<br><br>
At 08:36 AM 4/10/2011, you wrote:<br>
<blockquote type=cite class=cite cite="">No, I had no idea. How
about giving us a rundown on just what frequencies each listens
for?<br><br>
7 3<br>
Earl<br><br>
On Sat, Apr 9, 2011 at 9:12 PM, Rahn Abbott
<<a href="mailto:whiskey7doa@gmail.com">whiskey7doa@gmail.com</a>>
wrote:<br>
<dl>
<dd><font face="Arial, Helvetica" size=2 color="#0000FF">Ummmm, you do
know that that US Military GPS units and your Garmin Etrex are not
listening to the same radio signals right? You do know military and US
government GPS runs on a completely different system? <br>
</font>
<dl>
<dd><font face="Tahoma" size=2>-----Original Message-----<br>
<dd>From:</b>
<a href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a>
[<a href="mailto:aprssig-bounces@tapr.org" eudora="autourl">
mailto:aprssig-bounces@tapr.org</a>] On Behalf Of </b>Earl Needham<br>
<dd>Sent:</b> Saturday, April 09, 2011 2:16 PM<br>
<dd>To:</b> TAPR APRS Mailing List<br>
<dd>Subject:</b> Re: [aprssig] Terrestrial Threat to GPS Has Now Hit The
MainstreamMedia.<br><br>
</font>
<dd>Yeah, but THIS time they're gonna affect a whole lot more than a
couple hundred thousand hams -- they're gonna royally foul up the
military (in the US), the new GPS approaches at many airports, hikers
using GPS, and us. Oh, and of course, all those owners of cars with
moving-map displays fed by a GPSr. I suspect the fan is about to
get hit.<br><br>
<dd>Vy 7 3<br>
<dd>Earl<br>
<dd>KD5XB<br><br>
<dd>On Thu, Apr 7, 2011 at 6:28 PM, Steve Noskowicz
<<a href="mailto:noskosteve@yahoo.com">noskosteve@yahoo.com</a>>
wrote:<br>
<dl><br>
<dd>I don't know if any of these tell, but at least one manufacturer
presented data to the FCC showing this interference capability and they
ignored it and went forward. I'll see if I can find that one
agan.<br><br>
<dd>The term I used was: Infinitesimal wisdom.<br><br>
<dd>BPL. this, then the 440 band... I guess you just follow the
money.<br>
<dd>--<br>
<dd> 73, Steve, K9DCI<br><br>
<br><br>
<dd>--- On Thu, 4/7/11, John L. Wilson
<<a href="mailto:jwilson@ncfcomm.com">jwilson@ncfcomm.com</a>>
wrote:<br><br>
<dd>> Date: Thursday, April 7, 2011, 7:35 AM<br><br>
<dd>> I found this article today. It<br>
<dd>> includes a video describing the issue and<br>
<dd>> has links to other sources of information.<br>
<dd>><br>
<dd>>
<a href="http://www.lightreading.com/document.asp?doc_id=206519&#msgs">
http://www.lightreading.com/document.asp?doc_id=206519&#msgs</a><br>
<dd>><br>
<dd>> Monty Wilson, NR0A<br>
<dd>>
<a href="mailto:jwilson@ncfcomm.com">jwilson@ncfcomm.com</a><br>
<dd>> -----Original Message-----<br>
<dd>> From:
<a href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a><br>
<dd>>
[<a href="mailto:aprssig-bounces@tapr.org" eudora="autourl">
mailto:aprssig-bounces@tapr.org</a>]<br>
<dd>> On Behalf<br>
<dd>> Of Stephen H. Smith<br>
<dd>> Sent: Thursday, April 07, 2011 4:30 AM<br>
<dd>> To: TAPR APRS Mailing List<br>
<dd>> Subject: [aprssig] Terrestrial Threat to GPS Has Now Hit<br>
<dd>> The Mainstream<br>
<dd>> Media.<br>
<dd>><br>
<dd>> News of the terrestrial wireless broadband network that<br>
<dd>> threatens to<br>
<dd>> overload and block GPS receivers, that I posted about<br>
<dd>> around a month ago has<br>
<dd>> now hit the mainstream media.<br><br>
</dl><br><br>
<dd>-----<br><br>
<dd>No virus found in this message.<br><br>
<dd>Checked by AVG -
<a href="http://www.avg.com">www.avg.com</a><br><br>
<dd>Version: 10.0.1209 / Virus Database: 1500/3561 - Release Date:
04/09/11<br><br>
</dl><br>
<dd>_______________________________________________<br>
<dd>aprssig mailing list<br>
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<dd>
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https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig</a><br><br>
</dl><br>
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