GS407 U-Blox5 -- how best to mount it to my aircraft --

Do you think it would make any difference if I mounted my GS407 U-Blox5  horizontally.  It will be on the top of my Cularis near the tail.  

Tags: GS407, U-Blox5

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It would absolutely make a difference. You would go from excellent to maybe spotty with drop outs during turns. It has a circular polarized antenna which needs to point to the sky. Try putting it inside the fuse. If it's just covered by thin plastic like a canopy it should work fine and be protected.
I put it in the fuse near the tail with the antenna sticking out the top. I have a video transmitter and data antenna in the near vicinity, do you think they will cause problems?
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Not much difference with the interference issue between on the ground and in the air. Fire it all up and see if you get a lock. You can also insert a debugging statement into whatever code you are using to print out whenever a checksum error occurs in the gps parser. Lots of checksum errors is a good sign of too much interference.

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