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  #1  
Old 06-01-2018, 04:10 PM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 545
Default gps antenna, alternator

i have an easy spot to mount my gps antennas under the cowl but they are within 4'' of the alternator. will there be trouble?
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Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12.
RV-12 kit as of 9/13
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  #2  
Old 06-01-2018, 10:32 PM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 3,328
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I am not an RF expert by any means, but I would be a bit concerned with my GPS antenna 4" from some large magnets, assuming you are referring to a standby alternator, which use magnetics instead of an electrical field. Alternators are known for electrical noise, but I suspect that is induced onto the electrical path and not radiated though I don't really know.

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  #3  
Old 06-02-2018, 12:19 PM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 545
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well, fwiw i just went outside with my handheld gps and turned it on while holding it next to the alternator of my car. then i repeated while the engine was running. the gps acquired satellites in the same amount of time. don't know what this proves but as a vfr pilot i am going to give it a try by the alternator.
also, back of gps antenna has a label that says something like ''pull tape here to remove magnets if they interfere with compass''.
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Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12.
RV-12 kit as of 9/13
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  #4  
Old 06-02-2018, 12:46 PM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,203
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Just a heads-up. Any alternator you're likely to encounter uses either coils of wire moving through a magnetic field, or a magnetic field rotating through coils, to generate electricity. The alts we typically use, that aren't 'permanent magnet' alternators, use electric current through a coil of wire wound on an iron core to *create* the magnet that allows the alternator to work.
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