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aadamson(at)highrf.com
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 Posted: Fri Apr 27, 2007 12:08 pm Post subject: Garmin GPS antenna |
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Most of the portable GPS's use 2.7V to drive the amplifier in an external antenna. Most of the current batch of certified external antennas including the KLX-135 version require a min of 3.5V to drive them. So I doubt that the amplifier will work in the KX-135 antenna and hence you'll have terrible or no GPS coverage when trying to use that antenna on the 496.
With that said, there are lots of mobile/perm mount antennas for the 496, you should be able to find a suitable/mountable version off of ebay.
Alan
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Larry James
Sent: Friday, April 27, 2007 2:48 PM
To: aeroelectric-list-digest(at)matronics.com
Subject: AeroElectric-List: Garmin GPS antenna
I am putting a Garmin GPS 496 in the panel of my Super Decathlon. One of my criteria is to have no loose wires etc. in the cockpit – hence I want permanently mounted antennas (I also dislike stuff on the glareshield). I made a bracket to place the XM antenna just forward of the false spar just under the top of the windshield; that problem solved.
The 496 (along with a Garmin SL40) is replacing a Bendix King KX135 GPS/COMM. I asked around to several avionics shops and Garmin asking if the external GPS antenna currently used by the KX135 will work with the Garmin. Garmin said “no” and none of the avionics shops had a definitive answer and all suggested “no”. The avionics shop that did the work (certified aircraft L) simply plugged the 496 into the existing external antenna and it worked.
My question is: if it works, is that the end of the story ?? Am I setting myself up for an imminent failure because it will work for a little while until it blows itself up ??
Larry E. James
Bellevue, WA
Super Decathlon
Rocket under construction
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az_gila
Joined: 17 Jun 2006
Posts: 99
Location: Tucson, AZ
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