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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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 Posted: Sun Aug 12, 2007 10:07 am Post subject: GPS/XM antenna interference |
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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.
[quote][b]
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aadamson(at)highrf.com
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| Posted: Sun Aug 12, 2007 1:59 pm Post subject: GPS/XM antenna interference |
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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(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Fiveonepw(at)aol.com
Sent: Sunday, August 12, 2007 2:06 PM
To: aeroelectric-list(at)matronics.com
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!)
AOL.com.
[quote]
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
[b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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| Posted: Tue Aug 14, 2007 12:30 pm Post subject: GPS/XM antenna interference |
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Just to pass along my learnings- after contacting the techies at Garmin, Trutrak and GRT, none expressed any concerns or related any experiences where locating these antennas(ae?) next to each other would create any problems. None of the replies from the various lists indicated much of a problem either- at least no one identified any specific technical issues. Proceeding as planned-
From the Antenna Farm...
Mark
(again, apologies for multi-list posting!)
AOL.com.
[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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