Avionics-List Digest Archive

Thu 01/03/08


Total Messages Posted: 1



Today's Message Index:
----------------------
 
     1. 03:56 PM - Re: GPS antenna tripping breaker (D Wysong)
 
 
 


Message 1


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    Time: 03:56:23 PM PST US
    From: "D Wysong" <hdwysong@gmail.com>
    Subject: Re: GPS antenna tripping breaker
    > I intend to buy an M3 compatible antenna for my install, but I want to confirm > that the Trimble antenna, and not the M3, was the cause of hight current draw. > Any idea of how can I confirm that short of sending my M3 to an avionice shop > for a yellow tag? Warm wires/fuses come before smoke/fire. Stop while your M3 is still alive, Robin. :-) The problem is likely w/ the antenna since you can run the unit on the bench with the antenna disconnected without blowing fuses and popping breakers. The installation manual is rather adamant about using one of the approved antennas (AN120, AN135, AN155) for reasons you've discovered. 1. Put the Trimble antenna away. 2. Measure the voltage on the antenna cable coming from the M3 between the center conductor and the outer connector and make sure you see 5V. 3. Order a COMANT CI 405-200 (AN120 equivalent) and be done with it. NOTE --- If you see 12V on the antenna cable your M3 is configured for use with an AN155. You can change an internal M3 jumper for 5V or buy an AN155. Regardless, don't do any more testing with the Trimble antenna. D




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