AeroElectric-List Digest Archive

Sun 08/12/07


Total Messages Posted: 4



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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    Time: 11:07:15 AM PST US
    From: Fiveonepw@aol.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!) http://discover.aol.com/memed/aolcom30tour


    Message 2


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    Time: 02:59:18 PM PST US
    From: "Alan Adamson" <aadamson@highrf.com>
    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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    Time: 07:31:34 PM PST US
    From: "Michael T. Ice" <aurbo@ak.net>
    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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    Time: 07:46:16 PM PST US
    From: BobsV35B@aol.com
    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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