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GPS ant placement?

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abnranger69(at)hotmail.co
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Posted: Tue Aug 12, 2014 4:21 pm Post subject: GPS ant placement?

A couple questions ref GPS ant placement;



I have two GPS ant to install on a Cessna.  My two com ant are located on each side at about mid wing root. My understanding is that GPS ant need to be located at least 18" from a com ant, preferably not near the leading edge of anything.  Anybody have any comments or experience with interference issues, placement?  How far apart do GPS ant need to be from each other?



Couldn't find any refs in Bob's book, 12th edition.....



Thanx, 

Dave

abnranger69(at)hotmail.com

 		 	   		  

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enginerdy(at)gmail.com
Guest

Posted: Tue Aug 12, 2014 4:31 pm Post subject: GPS ant placement?

GPS antennas need a clear view of the sky, or a clear view through non-conductive materials (like fiberglass or plexiglass). You might be able to get away with some obstructions, but fewer is better.

You should not put anything too close to transmitting antennas in general, so the COM antenna spacing seems reasonable-- but GPS antennas do not transmit, so you should be able to place them right next to one another without a problem.



On Aug 12, 2014, at 7:19 PM, david johnston <abnranger69(at)hotmail.com (abnranger69(at)hotmail.com)> wrote:

[quote]A couple questions ref GPS ant placement;



I have two GPS ant to install on a Cessna.  My two com ant are located on each side at about mid wing root. My understanding is that GPS ant need to be located at least 18" from a com ant, preferably not near the leading edge of anything.  Anybody have any comments or experience with interference issues, placement?  How far apart do GPS ant need to be from each other?



Couldn't find any refs in Bob's book, 12th edition.....



Thanx, 

Dave

abnranger69(at)hotmail.com (abnranger69(at)hotmail.com)



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BobsV35B(at)aol.com
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Posted: Tue Aug 12, 2014 4:40 pm Post subject: GPS ant placement?

Good Afternoon Dave, 

  

 I am aFRAID MY COMMENTS MAY NOT HELP AT ALL, BUT IF YOU ARE PLACING THOSE  ANTENNAS ON A CERTIFIED AIRPLANE, IT IS BEST IF YOU REFER TO A CURRENT faa  APPROVED VERSION OF THE iNSTALLATION MANUAL. 

  

 TO COMPLY WITH THE FarS YOU MAY HAVE TO CONFORM TO WHAT HAS BEEN WRITTEN BY  THE faa. 

  

 aBOUT TWO YEARS AGO, THE fedS ADDED VERY RESTRICTIVE LANGUAGE TO THE  CURRENT INSTALL MANUALS OF SEVERAL CURRENT Gps UNITS. sINCE IT IS REQUIRED THAT  THE INSTALLATION CONFORM TO THE INSTRUCTIONS IN THE CURRENT INSTALL MANUAL, YOU  MAY WELL BE BOUND BY THE NEW DATA. i HAVE SEEN MANY INSTALLATIONS THAT HAVE  WORKED FINE WITH THE ANTENNAS WITHIN FOUR INCHES OF EACH OTHER AND WTHIN A FOOT  OR TWO OF cOM ANTENNAS, BUT THE NEW fed GUIDANCE CALLS FOR no ANTENNA ON THE  CENTER LINE AND FOR SPACING TWO ANTENNAS ONE ON EACH SIDE OF THE CENTER LINE.  tHEY ALSO CALL FOR THE gps ANTENNAS TO BE A MINIMUM OF NINE INCHES APART. oNCE  AGAIN. i THINK THEY ARE NUTS, BUT i ALSO DO FEEL THAT YOU WILL HAVE TO COMPLY  WITH THOSE NEW RULES UNLESS YOU CAN GET A der TO WRITE UP SOMETHING ELSE. 

  

 MOST OF THE faa FOLKS ARE GOOD PEOPLE AND WANT TO DO A GOOD JOB. BUT SOME  OF THEM GET CARRIED AWAY WITH A "WHAT IF" ATTITUDE CARRIED TO THE EXTREME. iN  ANY CASE, IT IS CERTAINLY BEST TO GET A COPYOF THE LATEST VERSION OF THE INSTALL  MANUAL BEFORE YOU CUT METAL.

  

 hAPPY sKIES,

  

 oLD bOB

  

 Darn I accidentally capitalized most of this message. Please excuse my  error!

  

  In a message dated 8/12/2014 7:22:00 P.M. Central Daylight Time,  abnranger69(at)hotmail.com writes:

  	  Quote: 	
		     A couple questions ref GPS ant placement;



I have two GPS    ant to install on a Cessna.  My two com ant are located on each side at    about mid wing root. My understanding is that GPS ant need to be located at    least 18" from a com ant, preferably not near the leading edge of    anything.  Anybody have any comments or experience with interference    issues, placement?  How far apart do GPS ant need to be from each    other?



Couldn't find any refs in Bob's book, 12th    edition.....



Thanx, 

Dave

abnranger69(at)hotmail.com



 	  Quote: 	
		  

	
	


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