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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>There was an article on New Scientist last
month about reliability of </span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>GPS</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> as a number of the satellites are past their “used-by-dates”:</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a
href="http://www.newscientist.com/article/mg20227085.700-ageing-satellites-put-gps-at-risk.html">http://www.newscientist.com/article/mg20227085.700-ageing-satellites-put-gps-at-risk.html</a></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I don’t think that would be your
problem though, the dates mentioned are 2011-2012.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-- </span></font><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Craig
Meyers</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
ausnog-bounces@lists.ausnog.net [mailto:ausnog-bounces@lists.ausnog.net] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Patrick Wu<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, 17 June 2009 5:50
PM<br>
<b><span style='font-weight:bold'>To:</span></b> ausnog@ausnog.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> [AusNOG] GPS Issues with
Microwave Radio Equipment</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'>Hi All,</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'>We have recently experienced some GPS synchronisation
errors with some of our microwave radios in the Sydney area. [The GPS feature
is used on some TDD radios to synchronise them so that they transmit at the
same time which allows for co-location of multiple radios on overlapping
frequencies]. </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'>Our understanding is that the GPS units receive
satellite signals at around 1500MHz which would not typically be impacted by
weather. Further the microwave links themselves operating on much higher
frequencies are not showing any adverse impact from the recent weather so we
are suspecting some other possible source causing the GPS issue.</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'>Has anyone else seen any unusual GPS errors and/or
activity with any GPS equipment of late?</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'>cheers,</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'>Patrick Wu</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt'>BigAir Group Ltd</span></font></p>
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