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Garmin GPS antenna

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trigo(at)mail.telepac.pt
Guest

Posted: Thu Mar 30, 2017 6:40 am Post subject: Garmin GPS antenna

The G3X Installation Manual says, in a "Note" on page 20-1, that "GA35, GA36 and GA37 antennas cannot be used with GDU 37X/4XX units".



Does anybody know why?



(I'm asking because I bought the pretty expensive GA35, as an excellent GPS antenna, before reading this "Note")



Thanks

Carlos



Enviado do meu iPhone

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Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Fri Mar 31, 2017 11:40 am Post subject: Re: Garmin GPS antenna

Not sure if this is the sole reason, but in the specs I see a slight mis-match in the dc power needed by the antenna, and what's furnished by the GDU37:

GA 35 needs: 4.0 to 5.0 volts at 60 ma

GDU37 furnishes 4.5 to 5.5 volts at up to 50 ma.

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Bob Turner
RV-10 QB

trigo(at)mail.telepac.pt
Guest

Posted: Sat Apr 01, 2017 3:26 am Post subject: Garmin GPS antenna

Thank you Bob



Could that be for so tiny differences?

Does that makes sense to the electronic experts in this list?



Thanks

Carlos



Enviado do meu iPhone



No dia 31/03/2017, às 20:40, Bob Turner <bobturner(at)alum.rpi.edu> escreveu:



 	  Quote: 	
		   

 

 Not sure if this is the sole reason, but in the specs I see a slight mis-match in the dc power needed by the antenna, and what's furnished by the GDU37:

 GA 35 needs: 4.0 to 5.0 volts at 60 ma

 GDU37 furnishes 4.5 to 5.5 volts at up to 50 ma.

 

 --------

 Bob Turner

 RV-10 QB

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=467882#467882

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Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Sat Apr 01, 2017 4:32 am Post subject: Re: Garmin GPS antenna

I don't think the problem is with the voltage or the current draw. They can't be cutting it that close. It most likely has to do with using a WAAS antenna on a non-WAAS receiver.



You're better off using one of their recommended antennas. Probably way cheaper too.



Lenny



 	  trigo(at)mail.telepac.pt wrote: 	
		  Thank you Bob



Could that be for so tiny differences?

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Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 500 hrs

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Sat Apr 01, 2017 9:28 am Post subject: Re: Garmin GPS antenna

 	  Lenny Iszak wrote: 	
		  I don't think the problem is with the voltage or the current draw. They can't be cutting it that close. 

] 	




If the antenna really needs 60 ma and the box's max really is 50, it could be that simple. Remember many of these antennas were not designed to match a Garmin box - they are off the shelf OEM designs with a Garmin label slapped on.

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Bob Turner
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