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Transponder antenna location

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lwinger

Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA

Posted: Wed Jan 18, 2012 4:49 pm Post subject: Transponder antenna location

On the 601XL or 650, where have builders placed the transponder antenna?  I'm considering a location on the bottom of the aircraft, just behind the center spar and under the seat area.  The advantages of that location seem to be a short coax run, minimizing signal loss.  The disadvantages might be shadow effect on the ground.    



I would appreciate your thoughts before I drill holes.  Thanks.

Larry Winger

Tustin, CA

CH 650B / Corvair

Wiring

  [quote][b]

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_________________
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger

larrycmcfarland(at)gmail.
Guest

Posted: Wed Jan 18, 2012 5:09 pm Post subject: Transponder antenna location

Hi Larry,

I placed my transponder antenna just behind the seats thru the belly and have had no problems with 

transmission or signal.  Radio antennae went thru the back top skin and returns opposite side from the transponder cable. Coaxial signals don’t affect each other this way.

 

Larry McFarland at www.macsmachine.com

 

From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Larry Winger

Sent: Wednesday, January 18, 2012 6:44 PM

To: zenith-list(at)matronics.com

Subject: Transponder antenna location

 

On the 601XL or 650, where have builders placed the transponder antenna?  I'm considering a location on the bottom of the aircraft, just behind the center spar and under the seat area.  The advantages of that location seem to be a short coax run, minimizing signal loss.  The disadvantages might be shadow effect on the ground.  

 



I would appreciate your thoughts before I drill holes.  Thanks.



 



Larry Winger



Tustin, CA



CH 650B / Corvair



Wiring

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Wed Jan 18, 2012 5:09 pm Post subject: Re: Transponder antenna location

Larry,



My transponder antenna is right behind the passenger seat going out the bottom of the fuselage.  No complaints from ATC yet about being able to see me.

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David Gallagher
Cincinnati, OH area

psm(at)att.net
Guest

Posted: Wed Jan 18, 2012 5:20 pm Post subject: Transponder antenna location

Hi Larry,

     

     I put mine behind the seats in the middle of the bottom skin.  I     wouldn't lose any sleep about signal loss in the coax cable.  I have     had my transponder certified and used it with ATC with no complaints     from anyone.

     

     Paul

     Zodiac XL in phase I flight test ~25 hours

     

     On 1/18/2012 4:43 PM, Larry Winger wrote:     [quote]On the 601XL or 650, where have builders placed the       transponder antenna?  I'm considering a location on the bottom of       the aircraft, just behind the center spar and under the seat area.        The advantages of that location seem to be a short coax run,       minimizing signal loss.  The disadvantages might be shadow effect       on the ground.                  

       

       I would appreciate your thoughts before I drill holes.          Thanks.

       

       

       Larry Winger

       Tustin, CA

       CH 650B / Corvair

       Wiring

        	  Quote: 	
		  

	
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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Wed Jan 18, 2012 5:36 pm Post subject: Transponder antenna location

On Jan 18, 2012, at 6:43 PM, Larry Winger wrote:



 	  Quote: 	
		   On the 601XL or 650, where have builders placed the transponder antenna?  I'm considering a location on the bottom of the aircraft, just behind the center spar and under the seat area.  The advantages of that location seem to be a short coax run, minimizing signal loss.  The disadvantages might be shadow effect on the ground.  

 

 I would appreciate your thoughts before I drill holes.  Thanks.


	


 That's where mine is, no complaints from ATC. That's where it is on most factory built planes.



I don't understand your concerns about shadow effects on the ground, the transponder isn't used on the ground for the most part. It's for signaling your position in the air.

-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

do not archive.

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

lwinger

Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA

Posted: Wed Jan 18, 2012 9:46 pm Post subject: Transponder antenna location

Thanks, guys.  Bryan, you're right about shadow effects. Not an issue.

Back to drilling.

Larry

On Wed, Jan 18, 2012 at 5:32 PM, Bryan Martin <bryanmmartin(at)comcast.net (bryanmmartin(at)comcast.net)> wrote:

  [quote]--> Zenith-List message posted by: Bryan Martin <bryanmmartin(at)comcast.net (bryanmmartin(at)comcast.net)>

 On Jan 18, 2012, at 6:43 PM, Larry Winger wrote:

 > On the 601XL or 650, where have builders placed the transponder antenna?  I'm considering a location on the bottom of the aircraft, just behind the center spar and under the seat area.  The advantages of that location seem to be a short coax run, minimizing signal loss.  The disadvantages might be shadow effect on the ground.

   >

 > I would appreciate your thoughts before I drill holes.  Thanks.

 That's where mine is, no complaints from ATC. That's where it is on most factory built planes.

 I don't understand your concerns about shadow effects on the ground, the transponder isn't used on the ground for the most part. It's for signaling your position in the air.

 --

 Bryan Martin

 N61BM, CH 601 XL,

 RAM Subaru, Stratus redrive.

 do not archive.

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_________________
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger

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