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ADS-B Antenna

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rnjcurtis(at)charter.net
Guest

Posted: Wed Aug 03, 2016 2:21 pm Post subject: ADS-B Antenna

I am in the process of gathering information for the installation of an ADS-B in my all wood airplane.Â  The Transponder that I am considering uses 2 antennas for the UAT 978 MHz portion.Â  I am considering using the small rod antenna which is similar to that used for the transponder.Â  Since it is a different frequency than the xponder I will purchase the one specifically for the UAT.Â  I am assuming that it is OK to mount this antenna inside the wood fuselage.Â  Is this correct?Â  Also I believe that it will need a ground plane.Â  Is there a recommended configuration for the ground of this antenna?Â  Would the 2 antennas be set up identically?

 

Roger

 

Sent from Mail for Windows 10

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user9253

Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan

Posted: Wed Aug 03, 2016 2:54 pm Post subject: Re: ADS-B Antenna

There was a recent thread about transponder antennas that might help:

http://forums.matronics.com/viewtopic.php?t=16762861&sid=0fdc43cf144daf15623736558e046890

I have read that a transponder antenna may also be used for 978 MHZ.

At the iFly booth in OSH, I was impressed by the pingBuddy dual band ADS-B receiver that is a fraction of the size and uses a fraction of the power of the Stratux.

http://www.uavionix.com/

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_________________
Joe Gores

rnjcurtis(at)charter.net
Guest

Posted: Thu Aug 04, 2016 7:08 am Post subject: ADS-B Antenna

There was a recent thread about transponder antennas that might help:

http://forums.matronics.com/viewtopic.php?t=16762861&sid=0fdc43cf144daf15623736558e046890

I have read that a transponder antenna may also be used for 978 MHZ.

At the iFly booth in OSH, I was impressed by the pinBuddy dual band ADS-B receiver that is a fraction of the size and uses a fraction of the power of the Stratux.

http://www.uavionix.com/

 

--------

Joe Gores

 

Â Â Â Â Â Â Â Â Â Â Â Â Â  Thanks Joe!Â  I was also at OSH and I am seriously looking at the SkyguardTWX ADS-B unit.Â  It is 2020 compliant, seems to have all the ADS-B features, can be used with your old style mode C transponder, and is reasonable priced.Â  

 

Xmit and receive antennas are not included.Â  They recommend using the 978MHz antenna for the UAT rather than the standard transponder antenna. I believe I will fabricate my antennas since they are simple, using a BNC connector, piece of brazing rod 77mm, and a copper ground plane. 

 

Does anyone have any experience with this device?Â  All comments welcomed.

 

Roger

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Aug 04, 2016 7:54 am Post subject: ADS-B Antenna

 	  Quote: 	
		  

  

 Xmit and receive antennas are not included.Â  They recommend using the 978MHz antenna for the UAT rather than the standard transponder antenna. I believe I will fabricate my antennas since they are simple, using a BNC connector, piece of brazing rod 77mm, and a copper ground plane. 	


   Keep in mind that the BNC connector's solder

   pot was never intended to be a structural feature.

   The moment arm of that antenna mast being buffeted

   in the wind imposes a serious stress to the

   non-ferrous material . . . which HAS a finite

   service life under vibratory stress.



   These antennas are not expensive . . .



  http://tinyurl.com/zeqau4d



   Notice that TED (and others) have

   incorporated extra support at the base

   of the antenna rod which is, if I recall

   correctly, one piece of metal all the way

   through.  A piece of wire soldered into

   the tail-end of a BNC connector will need

   some similar attention.



   Further, there is little value added for tweaking

   the length for 978 Mhz vs. 1050. Recall that

   your VHF comm antenna works fine over a range of

   118 to 135 Mhz . . . a bandwidth of 7 percent

   either side of center.  The spread of frequencies

   of interest at ADS-B/Xpndr is only 3.5 percent.



 

   Bob . . .

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rnjcurtis(at)charter.net
Guest

Posted: Thu Aug 04, 2016 8:26 am Post subject: ADS-B Antenna



 

Xmit and receive antennas are not included.Ã‚  They recommend using the 978MHz antenna for the UAT rather than the standard transponder antenna. I believe I will fabricate my antennas since they are simple, using a BNC connector, piece of brazing rod 77mm, and a copper ground plane. 

  These antennas are not expensive . . .



http://tinyurl.com/zeqau4d



  Further, there is little value added for tweaking

  the length for 978 Mhz vs. 1050. Recall that

  your VHF comm antenna works fine over a range of

  118 to 135 Mhz . . . a bandwidth of 7 percent

  either side of center.  The spread of frequencies

  of interest at ADS-B/Xpndr is only 3.5 percent.



Â Â Â Â Â Â Â Â Â Â  You convinced me.Â  I will buy the antennas.Â  In looking 

Â Â Â Â Â Â Â Â Â Â  further on Ebay, the 978MHz antenna isÂ  only $Â½ more 

Â Â Â Â Â Â Â Â Â Â  so I think I will spring for the difference.Â  

 

Â Â Â Â Â Â Â Â Â Â  I plan to mount these inside an all wood fuselage.Â  Do you 

Â Â Â Â Â Â Â Â Â Â  see any problem with that?

 

Â Â Â Â Â Â Â Â Â Â  Roger

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Aug 04, 2016 11:00 am Post subject: ADS-B Antenna

 	  Quote: 	
		  You convinced me.Â  I will buy the antennas.Â  In looking 

 further on Ebay, the 978MHz antenna isÂ  only $Â½ more 

 so I think I will spring for the difference.Â  

  

 I plan to mount these inside an all wood fuselage.Â  Do you 

 see any problem with that?

 	


   Nope. Mount them on circles of aluminum

   with a diameter of 6".  Mount them pointing

   down . . .



 

 

   Bob . . .

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