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1. 03:56 PM - Re: GPS antenna tripping breaker (D Wysong)
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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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