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pwmac(at)sisna.com
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 Posted: Mon May 04, 2009 6:10 am Post subject: What can GPS and XM antennas see through? |
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Dirt simple test for your plane will yield the results you need. Example I use a gps in my truck with a solid metal roof 2 gps one with internal antenna one with external antenna laying on the dash. No reduction in sensitivity or position error is noted. In my other trucks one with sheet molded plastic roof and the other with a fiberglass shell. same result. Just find some material to match your construction and turn on the devices. I am sure you will find excellent results. These days antenna placement is not critical.
Paul
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At 05:08 PM 5/3/2009, you wrote:
[quote]Are there any published specs as to what materials, at what thickness, satellite antennas can see through without a large attenuation of signal strength? If so can you point me toward them?
Thanks,
Roger
Good Evening Chris,
The antennas will look through that glareshield just fine. However, you must remember that any distance below the very top of the airplane will reduce the amount of sky that can be seen via the antennas.
We have found that antennas mounted on top of the glove box and under the glareshield work reasonably well in various Bonanzas.
Happy Skies
Old Bob
In a message dated 5/3/2009 5:21:28 P.M. Central Daylight Time, cskelt(at)earthlink.net writes:
Folks, I'm installing a Garmin 496 in my Lancair 320. The Garmin manual suggests placing the GPS and XM antennas supplied with the unit where they can see the sky through the canopy. This could be achieved by placing the two devices on the glare shield. However it would be an easier installation if I were to place the two antennas below the glare shield. This way, there'd be no awkward electrical connections to deal with when removing or replacing the glare shield. If the antennas can see through perspex, (or laminated auto glass) can they additionally see through the skinny fiberglass molding covered with headlining material? Thanks in advance for any advice.
Chris Skelt.
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longg(at)pjm.com
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| Posted: Mon May 04, 2009 9:23 am Post subject: What can GPS and XM antennas see through? |
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Chris,
On my legacy I added a shelf to the side of the fuse just behind the storage bulkhead. The shelf is mounted about even with rudder channel. With the bulkhead cover on I still get great reception even in the hangar (door open).
Here’s a picture
http://1.bp.blogspot.com/_hkAHk0Xu6wo/SHOnYZwaZwI/AAAAAAAAAZQ/RsdsLydOu70/s1600-h/IMG_1171.JPG
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of paul wilson
Sent: Monday, May 04, 2009 10:01 AM
To: aeroelectric-list(at)matronics.com
Subject: RE: What can GPS and XM antennas see through?
Dirt simple test for your plane will yield the results you need. Example I use a gps in my truck with a solid metal roof 2 gps one with internal antenna one with external antenna laying on the dash. No reduction in sensitivity or position error is noted. In my other trucks one with sheet molded plastic roof and the other with a fiberglass shell. same result. Just find some material to match your construction and turn on the devices. I am sure you will find excellent results. These days antenna placement is not critical.
Paul
=========
At 05:08 PM 5/3/2009, you wrote:
Are there any published specs as to what materials, at what thickness, satellite antennas can see through without a large attenuation of signal strength? If so can you point me toward them?
Thanks,
Roger
Good Evening Chris,
The antennas will look through that glareshield just fine. However, you must remember that any distance below the very top of the airplane will reduce the amount of sky that can be seen via the antennas.
We have found that antennas mounted on top of the glove box and under the glareshield work reasonably well in various Bonanzas.
Happy Skies
Old Bob
In a message dated 5/3/2009 5:21:28 P.M. Central Daylight Time, cskelt(at)earthlink.net writes:
Folks, I'm installing a Garmin 496 in my Lancair 320. The Garmin manual suggests placing the GPS and XM antennas supplied with the unit where they can see the sky through the canopy. This could be achieved by placing the two devices on the glare shield. However it would be an easier installation if I were to place the two antennas below the glare shield. This way, there'd be no awkward electrical connections to deal with when removing or replacing the glare shield. If the antennas can see through perspex, (or laminated auto glass) can they additionally see through the skinny fiberglass molding covered with headlining material? Thanks in advance for any advice.
Chris Skelt.
__________________
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