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  #1  
Old 08-04-2018, 06:38 PM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 619
Default Transponder doubler

Is a doubler necessary or optional for the transponder location under right baggage compartment? Plans included one for com 1 and 2. Inclined to not worry about it.
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  #2  
Old 08-04-2018, 07:08 PM
Tom023 Tom023 is offline
 
Join Date: Jul 2011
Location: Cypress, TX
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I just made one today and used the cork gasket to get the holes laid out. Took all of 15 minutes.i l redid the com ones too. The plans have you rivet them on but the four holes used for rivets are where the antenna screws need to go through. I put nutplates on the backside.
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Last edited by Tom023 : 08-04-2018 at 07:18 PM.
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  #3  
Old 08-04-2018, 11:14 PM
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RV-14E RV-14E is offline
 
Join Date: Jun 2018
Location: Colorado
Posts: 126
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For the antennas that are directly underneath the baggage area, I chose not to include doublers, when I installed my ADS-B receiver antennas.



I reasoned (perhaps incorrectly, after all it's 0.025" skin), that they are blade antennas with a small profile...



Unlike the two communications antennas up front, which do have doublers on 0.04" skin.



I did put a doubler on the big Garmin GPS antenna (the doubler template can be found in that link)



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  #4  
Old 08-05-2018, 08:28 AM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
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I also built and installed a doubler for the GPS antenna on top. I installed it with the small head rivets with a slight countersink in the skin to avoid having to dimple. Usually I use those NAS rivets for nutplates. Worked out great.
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