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Transponder Antenna issue...

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meyerkc135(at)gmail.com
Guest

Posted: Wed Nov 22, 2017 10:21 am Post subject: Transponder Antenna issue...

I've got a regular old ball and post transponder antenna on the belly of my Long EZ... Someone's foot caught it and snapped it off, but I have the part. Tried soldering it together and got it structurally sound, but it doesn't work any more...Â 



What's the best material to use for a replacement post?

What's the best antenna to put in a Long EZ and where? Are the tips too far for a GTX330 to push a good signal to? What about in the nose just in front of the battery? Too much shielding from the battery? Do I have to worry about putting the antenna too close to pink juicy matter - is this a real risk?

Thanks!

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ceengland7(at)gmail.com
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Posted: Wed Nov 22, 2017 10:43 am Post subject: Transponder Antenna issue...

On 11/22/2017 12:19 PM, Andrew Meyer wrote:

 	  Quote: 	
		   I've got a regular old ball and post transponder antenna on the belly 

 of my Long EZ... Someone's foot caught it and snapped it off, but I 

 have the part. Tried soldering it together and got it structurally 

 sound, but it doesn't work any more...



 What's the best material to use for a replacement post?



 What's the best antenna to put in a Long EZ and where? Are the tips 

 too far for a GTX330 to push a good signal to? What about in the nose 

 just in front of the battery? Too much shielding from the battery? Do 

 I have to worry about putting the antenna too close to pink juicy 

 matter - is this a real risk?



 Thanks!

Aviation dept at ebay:
	




https://www.ebay.com/itm/TED-104-17-Aircraft-ADS-B-UAT-978-MHz-Post-Antenna/141824351182?epid=724999345&hash=item210563dbce:m:mPotFwG_HJqxr1lH285Bmgw&vxp=mtr



A 'spike' like that does need a ground plane, which you probably already 

have in the EZ, if that's what was broken off (and the builder installed 

it correctly). As to moving it, what are the odds of that happening again?



---

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 22, 2017 10:51 am Post subject: Transponder Antenna issue...

At 12:19 PM 11/22/2017, you wrote:

  	  Quote: 	
		  I've got a regular old ball and post transponder antenna on the belly of my Long EZ... Someone's foot caught it and snapped it off, but I have the part. Tried soldering it together and got it structurally sound, but it doesn't work any more...Â 



 What's the best material to use for a replacement post? 	


   how about a new antenna . . . they're not expensive.

   TED104-12 is a VERY common part available new

   off of ebay



  http://tinyurl.com/yd9v9g6j



 

  	  Quote: 	
		  What's the best antenna to put in a Long EZ and where? Are the tips too far for a GTX330 to push a good signal to? What about in the nose just in front of the battery? Too much shielding from the battery? 	


   Any place on the belly is fine. You need a ground-plane

   consisting of a 5-3/4" diameter disk of aluminum.



  	  Quote: 	
		   Do I have to worry about putting the antenna too close to pink juicy matter - is this a real risk? 	


   No.



 

   Bob . . .

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kjashton(at)vnet.net
Guest

Posted: Wed Nov 22, 2017 10:56 am Post subject: Transponder Antenna issue...

 	  Quote: 	
		   On Nov 22, 2017, at 1:19 PM, Andrew Meyer <meyerkc135(at)gmail.com> wrote:

 

 I've got a regular old ball and post transponder antenna on the belly of my Long EZ... Someone's foot caught it and snapped it off, but I have the part. Tried soldering it together and got it structurally sound, but it doesn't work any more... 

 

 What's the best material to use for a replacement post?


	


These $25 antennas on ebay are a pretty good deal, although you can make one out of a brass bolt if you are really a hard-core builder.  

https://www.ebay.com/itm/TED-104-12-Aircraft-Transponder-DME-ADS-B-Post-Antenna/140958325304?epid=712364020&hash=item20d1c55a38:m:mPotFwG_HJqxr1lH285Bmgw&vxp=mtr

 	  Quote: 	
		   

 What's the best antenna to put in a Long EZ and where? Are the tips too far for a GTX330 to push a good signal to? What about in the nose just in front of the battery? Too much shielding from the battery? Do I have to worry about putting the antenna too close to pink juicy matter - is this a real risk?


	


I put them under the seat, sticking out the bottom of the fuselage.  The RF is too short to do any harm.  If you put it in the nose on a pusher it will often be blocked by the bags of water in the front seats or the engine and the radar will lose contact climbing out from the station.

-Kent

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meyerkc135(at)gmail.com
Guest

Posted: Wed Nov 22, 2017 2:58 pm Post subject: Transponder Antenna issue...

The other option that I'm considering is a Sim Jim antenna far up in the nose to the left - as far past the battery as I can get it or in the right wing root - about 4 feet to the right of the pink bag of fluid that manipulates the controls... I do want it out of the wind because any drag at 170 knots with only 50 or 60 HP pushing at altitude makes a BIG difference.

https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/





Set the velocity factor at about .94 with 14 gauge solid (house) wire and tune at 1060MHz (half way in between 1030 and 1090.) I use one of these for my Stratux ADS-B and get 200+ mile returns from aircraft... Any thoughts on how to do this better?

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ashleysc(at)broadstripe.n
Guest

Posted: Wed Nov 22, 2017 7:47 pm Post subject: Transponder Antenna issue...

Hi Andrew;

B & C Specialty Products offers a transponder antenna (their Pt. # ANT-1) for $21.00.

I would be hard pressed to make one for that price.

Cheers!   Stu.

From: "Andrew Meyer" <meyerkc135(at)gmail.com>

To: aeroelectric-list(at)matronics.com

Sent: Wednesday, November 22, 2017 10:19:44 AM

Subject: Transponder Antenna issue...

I've got a regular old ball and post transponder antenna on the belly of my Long EZ... Someone's foot caught it and snapped it off, but I have the part. Tried soldering it together and got it structurally sound, but it doesn't work any more... 



What's the best material to use for a replacement post?

What's the best antenna to put in a Long EZ and where? Are the tips too far for a GTX330 to push a good signal to? What about in the nose just in front of the battery? Too much shielding from the battery? Do I have to worry about putting the antenna too close to pink juicy matter - is this a real risk?

Thanks!

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 24, 2017 8:01 am Post subject: Transponder Antenna issue...

At 04:56 PM 11/22/2017, you wrote:

  	  Quote: 	
		  The other option that I'm considering is a Sim Jim antenna far up in the nose to the left - as far past the battery as I can get it or in the right wing root - about 4 feet to the right of the pink bag of fluid that manipulates the controls... I do want it out of the wind because any drag at 170 knots with only 50 or 60 HP pushing at altitude makes a BIG difference.



  https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/



 Set the velocity factor at about .94 with 14 gauge solid (house) wire and tune at 1060MHz (half way in between 1030 and 1090.) I use one of these for my Stratux ADS-B and get 200+ mile returns from aircraft... Any thoughts on how to do this better? 	


    The 'slim jim' is a 3/4 wave assembly consiting

    of a 1/2 wave, end fed dipole and a 1/4 wave

    matching section. Bob Archer designed and sold  a 1/2 wave,

    gamma matched dipole suitable for mounting

    on inside surface of a glass and plastic airplane . . .

    2/3 the length of a 'slim jim'.  I think ACS still

    sells this antenna.



 

 

   Bob . . .

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