Today's Message Index:
----------------------
1. 11:07 AM - GPS/XM antenna interference (Fiveonepw@aol.com)
2. 02:59 PM - Re: GPS/XM antenna interference (Alan Adamson)
3. 07:31 PM - Seminar in Anchorage (Michael T. Ice)
4. 07:46 PM - Re: Seminar in Anchorage (BobsV35B@aol.com)
Message 1
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Subject: | GPS/XM antenna interference |
At an OSH forum it was recommended to not locate active antennas(ae?) next to
each other as their active electronics could degrade or corrupt data from
them. I've been unable to find any such restrictions in the installation
information provided with the equipment which includes GNS430W, GRT Dual Horizons
with XM satellite and internal GPS, Trutrak ADI with it's own GPS, for a total
of
3 GPS antennas(ae?) and one XM receiver. I'd like to mount these on a common
shelf at the top of the firewall under the cowl.
Each antenna appears to have a simple coaxial connection which tells me
little of it's "active" capability or if these are simple (non-active) devices,
although I know the antenna for the 430W is a dedicated unit (not same as non-W
unit). The antenna for the ADI is a Laipac Tech model GLP1.
Before I contact the various suppliers tomorrow, does anyone have any actual
experience with this or know of any installation requirements/recommended
practices for these devices, or is this more Urban Legend?
Mark Phillips
(with apologies for posting to multiple lists!)
http://discover.aol.com/memed/aolcom30tour
Message 2
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Subject: | GPS/XM antenna interference |
I believe that the issue is a little more complicated. There are really 2
types of antennas. One that just has a pre-amp in it - these are mostly for
GPS receivers, and then the XM type antennas - these not only have a pre-amp
installed, but also have a full communications receiver in them. Even
receivers are basically little transmitters with LO frequencies that may
"mix" with other active antennas. Either in the pre-amp or the RX that may
be included in the antenna. This MIX may cause interference with the RX'rs
ability to decode the signal that they are intended for and so the signal
may be degraded.
At 2.4Ghz, these wave lengths are pretty small so locating item at least 1
wave length apart shouldn't be too difficult. What I wouldn't do it stack
or locate them so they were touching in any way. The farther apart the
better just to be safe.
Alan
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Fiveonepw@aol.com
Sent: Sunday, August 12, 2007 2:06 PM
Subject: AeroElectric-List: GPS/XM antenna interference
At an OSH forum it was recommended to not locate active antennas(ae?) next
to each other as their active electronics could degrade or corrupt data from
them. I've been unable to find any such restrictions in the installation
information provided with the equipment which includes GNS430W, GRT Dual
Horizons with XM satellite and internal GPS, Trutrak ADI with it's own GPS,
for a total of 3 GPS antennas(ae?) and one XM receiver. I'd like to mount
these on a common shelf at the top of the firewall under the cowl.
Each antenna appears to have a simple coaxial connection which tells me
little of it's "active" capability or if these are simple (non-active)
devices, although I know the antenna for the 430W is a dedicated unit (not
same as non-W unit). The antenna for the ADI is a Laipac Tech model GLP1.
Before I contact the various suppliers tomorrow, does anyone have any actual
experience with this or know of any installation requirements/recommended
practices for these devices, or is this more Urban Legend?
Mark Phillips
(with apologies for posting to multiple lists!)
_____
AOL.com.
Message 3
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Subject: | Seminar in Anchorage |
Hello,
I just had the pleasure of being involved in one of Bob Nuckolls' seminars. It
was a great event and worth every penny. If you ever have the opportunity to attend
one of these seminars, do it.
Blue Skies,
Mike Ice
Anchorage, Alaska
Message 4
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Subject: | Re: Seminar in Anchorage |
In a message dated 8/12/2007 9:35:52 P.M. Central Daylight Time,
aurbo@ak.net writes:
Hello,
I just had the pleasure of being involved in one of Bob Nuckolls' seminars.
It was a great event and worth every penny. If you ever have the opportunity
to attend one of these seminars, do it.
Blue Skies,
Mike Ice
Anchorage, Alaska
Been There, Done That!! I agree!!!!
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
http://discover.aol.com/memed/aolcom30tour
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