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1. 02:38 PM - GPS antenna tripping breaker (Robin Hou)
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| Subject: | GPS antenna tripping breaker |
I run into a possible antenna related problem when testing my Northstar M3 GPS.
First, let me describe my set up. My M3 is wired to MD40 CDI, Narco AR850, and
an USB RS-485 converter to a PC. During my test, I connected a Trimble GPS antenna
(P/N 16248-20) via an SMA-to-BNC adapter. I used the Trimble antenna because
that was what I have on hand although I knew it is not an approved antenna
for M3.
My M3 did acquire GPS signals OK, and outputed GPS position to my PC. However,
after few minutes, my ship power 3A breaker tripped. I felt the power wire and
the breaker, and they are HOT. I re-wired my setup to a seprate 12V battery via
a 5A fuse, and it again tripped the fuse. And the M3 felt very hot like a light
bulb.
I then tried a 10A fuse & it managed to run for 15 min without tripping the fuse.
I know I should have measue the amp but did not because I don't have a amp
meter that will handle the current.
I let the M3 cooled then use new 3A fuses for the rest of my test. I found the
M3 would run for more than 30 min without tripping the 3A fuse and not getting
hot when the antenna was disconnected.
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?
Thanks in advance.
Robin Hou
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