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Date: Tue, 08 Jul 2008 10:33:31 -0400
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From: "Ron Galbraith" <cfi@instructor.net>
Subject: Re: [LML] Re: WAAS antennas

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 Since the WAAS satellites are geostationary, they are tipically lower on
the horizon, and of course always SouthEast through SouthWest of here
(anywhere in US).  If you want to see where they would be in the sky in
relation to your position, check out these web sites:
AOR-W http://www.lyngsat.com/tracker/inmar3f4.html
PanAmSat  http://www.lyngsat.com/tracker/g15.html
POR http://www.lyngsat.com/tracker/inmar3f3.html

Ron Galbraith

  -
  The WAAS signal is not transmitted by "conventional" GPS satellites,
  rather, it is transmitted from geostationary telecommunication
  satellites. Consequently the signal does not behave like the signal
  from the orbiting GPS satellite constellation. Also, there can ne a
  dozen or more GPS satellites in view with only 4 needed for a fix but
  there are only two WAAS satellites with one being needed for a  WAAS
  approach.

  Bottom line is that is WAAS is intermittent then it is likely the
  antenna location or signal path to your GPS' RF section (line of
  sight, antenna, connectors or Coax cable).

  Mounting the antenna inside the aircraft will frequently cause
  problems due to the fuselage shading the WAAS signal to the antenna.

  If I hang a GPS antenna out the lab's eastern window I can get a good
  fix from the satellites to the northeast but no WAAS.

  Regards
  Brent Regan

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<div>
Since the WAAS satellites are geostationary, they are tipically lower on th=
e horizon, and of course always SouthEast through SouthWest of here (anywhe=
re in US).&nbsp; If you want to see where they would be in the sky in relat=
ion to your position, check out these web sites:<br>AOR-W http://www.lyngsa=
t.com/tracker/inmar3f4.html<br>PanAmSat&nbsp; http://www.lyngsat.com/tracke=
r/g15.html<br>POR http://www.lyngsat.com/tracker/inmar3f3.html<br><br>Ron G=
albraith<br>
<br>
<blockquote style=3D"border-left: 2px solid rgb(16, 16, 255); margin-left: =
5px; padding-left: 5px;">-<brent@regandesigns.com><br>


=20=20
=20=20

<font face=3D"Arial">The WAAS signal is not transmitted by "conventional"
GPS satellites, rather, it is transmitted from geostationary
telecommunication satellites. Consequently the signal does not behave
like the signal from the orbiting GPS satellite constellation. Also,
there can ne a dozen or more GPS satellites in view with only 4 needed
for a fix but there are only two WAAS satellites with one being needed
for a&nbsp; WAAS approach. <br>
<br>
Bottom line is that is WAAS is intermittent then it is likely the
antenna location or signal path to your GPS' RF section (line of sight,
antenna, connectors or Coax cable). <br>
<br>
Mounting the antenna inside the aircraft will frequently cause problems
due to the fuselage shading the WAAS signal to the antenna.<br>
<br>
If I hang a GPS antenna out the lab's eastern window I can get a good
fix from the satellites to the northeast but no WAAS. <br>
<br>
Regards<br>
Brent Regan<br>
</font>
</brent@regandesigns.com></blockquote>
</div>
<BR>

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