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Transponder antenna distance

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Laz

Joined: 04 Jan 2016
Posts: 30

Posted: Fri Jun 03, 2016 4:04 am Post subject: Transponder antenna distance

Just when I think I have thought of everything in my G3X installation something else comes up.  I have a GTX23ES transponder that is a a remote mount.  I decided to mount it in the tail section where the rear battery mount is.  It worked well there because of weight and balance and I figured my cable run to the Antenna would be short and out of the way of everything else.  I missed a requirement in the Garmin Manual that says the Antenna should be 3 feet from the unit.  I plande to out eh antenna just behind unit on the belly.  I will also have a ADSB antenna on the rear belly and know that it needs to be 3' from the T-ponder antenna according to gamin.  

Am I correct in assuming that the same RF problem will exist with the ADSB being to close to the transponder unit itself ?  



I have found at least one Installer that has the transponder unit within a foot of the antenna and has had no problems.

Trying to keep all the antennas separated on the RV8 is not easy.  



Any thoughts on this are appreciated.

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rnewman(at)tcwtech.com
Guest

Posted: Fri Jun 03, 2016 5:09 am Post subject: Transponder antenna distance

I have my navworx ads-b box about 12" from the antenna in my rv-10 located in the tail cone. No issues, works well for 4 years now.    A full metal enclosure transceiver, properly terminated RG-400 cable, mounted inside an aluminum tailcone is just about as good as it gets.   

Bob Newman

TCW Technologies, LLC



 	  Quote: 	
		   On Jun 3, 2016, at 8:02 AM, Michael Lazarowicz <tllaz330(at)gmail.com> wrote:

 

 Just when I think I have thought of everything in my G3X installation something else comes up.  I have a GTX23ES transponder that is a a remote mount.  I decided to mount it in the tail section where the rear battery mount is.  It worked well there because of weight and balance and I figured my cable run to the Antenna would be short and out of the way of everything else.  I missed a requirement in the Garmin Manual that says the Antenna should be 3 feet from the unit.  I plande to out eh antenna just behind unit on the belly.  I will also have a ADSB antenna on the rear belly and know that it needs to be 3' from the T-ponder antenna according to gamin.  

 

 Am I correct in assuming that the same RF problem will exist with the ADSB being to close to the transponder unit itself ?  

 I have found at least one Installer that has the transponder unit within a foot of the antenna and has had no problems.

 

 Trying to keep all the antennas separated on the RV8 is not easy.  

 

 

 Any thoughts on this are appreciated.

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rene(at)felker.com
Guest

Posted: Fri Jun 03, 2016 6:01 am Post subject: Transponder antenna distance

I wonder if that is a cable length requirement or a physical distance requirement.  In my past reading I remember minimum cable length requirements for GPS antennas.  Just an opinion, I really do not know anything.  Maybe Stein knows?

 

Rene'

801-721-6080

 

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Michael Lazarowicz

Sent: Friday, June 03, 2016 6:03 AM

To: aeroelectric-list(at)matronics.com

Subject: Transponder antenna distance



 

Just when I think I have thought of everything in my G3X installation something else comes up.  I have a GTX23ES transponder that is a a remote mount.  I decided to mount it in the tail section where the rear battery mount is.  It worked well there because of weight and balance and I figured my cable run to the Antenna would be short and out of the way of everything else.  I missed a requirement in the Garmin Manual that says the Antenna should be 3 feet from the unit.  I plande to out eh antenna just behind unit on the belly.  I will also have a ADSB antenna on the rear belly and know that it needs to be 3' from the T-ponder antenna according to gamin.  



Am I correct in assuming that the same RF problem will exist with the ADSB being to close to the transponder unit itself ?  



I have found at least one Installer that has the transponder unit within a foot of the antenna and has had no problems.



Trying to keep all the antennas separated on the RV8 is not easy.  



Any thoughts on this are appreciated.

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ceengland7(at)gmail.com
Guest

Posted: Fri Jun 03, 2016 6:08 am Post subject: Transponder antenna distance

It's worth asking Garmin, but I'd bet what they really mean is 3' of 

coax minimum; easy to do with a 'U' shaped run.



I'd hope that boxes intended to emit and/or receive RF energy would 

contain and isolate it to the center of the coax connector. Otherwise, 

you'd have issues with a lot of other 'stuff' in the plane.



Charlie



On 6/3/2016 8:07 AM, Tcwtech wrote:

 	  Quote: 	
		   



 I have my navworx ads-b box about 12" from the antenna in my rv-10 located in the tail cone. No issues, works well for 4 years now.    A full metal enclosure transceiver, properly terminated RG-400 cable, mounted inside an aluminum tailcone is just about as good as it gets.

 Bob Newman

 TCW Technologies, LLC



> On Jun 3, 2016, at 8:02 AM, Michael Lazarowicz <tllaz330(at)gmail.com> wrote:

>

> Just when I think I have thought of everything in my G3X installation something else comes up.  I have a GTX23ES transponder that is a a remote mount.  I decided to mount it in the tail section where the rear battery mount is.  It worked well there because of weight and balance and I figured my cable run to the Antenna would be short and out of the way of everything else.  I missed a requirement in the Garmin Manual that says the Antenna should be 3 feet from the unit.  I plande to out eh antenna just behind unit on the belly.  I will also have a ADSB antenna on the rear belly and know that it needs to be 3' from the T-ponder antenna according to gamin.

>

> Am I correct in assuming that the same RF problem will exist with the ADSB being to close to the transponder unit itself ?

> I have found at least one Installer that has the transponder unit within a foot of the antenna and has had no problems.

>

> Trying to keep all the antennas separated on the RV8 is not easy.

> Any thoughts on this are appreciated.

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Laz

Joined: 04 Jan 2016
Posts: 30

Posted: Fri Jun 03, 2016 6:31 am Post subject: Transponder antenna distance

Well I asked Garmin. and they indicated that in a mental airplane is was probably ot going to be an issue.  The manual says distance from Unit , not cable length.  The guy I talked with said this is really a bigger issue on composite AC than on mental ones.  He also noted that I could switch the ADSB antenna with the Transponder Antenna locations since the ADSB is in only.  Fortunately I have enough Coax to do that.  I will have close to 3 feet and the Coax will be at least 3 feet long from the transponder to the antenna.



On Fri, Jun 3, 2016 at 10:10 AM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

 	  Quote: 	
		  --> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>

 

 It's worth asking Garmin, but I'd bet what they really mean is 3' of coax minimum; easy to do with a 'U' shaped run.

 

 I'd hope that boxes intended to emit and/or receive RF energy would contain and isolate it to the center of the coax connector. Otherwise, you'd have issues with a lot of other 'stuff' in the plane.

 

 Charlie

 

 On 6/3/2016 8:07 AM, Tcwtech wrote:

  	  Quote: 	
		   --> AeroElectric-List message posted by: Tcwtech <rnewman(at)tcwtech.com (rnewman(at)tcwtech.com)>

 

 I have my navworx ads-b box about 12" from the antenna in my rv-10 located in the tail cone. No issues, works well for 4 years now.    A full metal enclosure transceiver, properly terminated RG-400 cable, mounted inside an aluminum tailcone is just about as good as it gets.

 

 

 Bob Newman

 TCW Technologies, LLC

 

  	  Quote: 	
		   On Jun 3, 2016, at 8:02 AM, Michael Lazarowicz <tllaz330(at)gmail.com (tllaz330(at)gmail.com)> wrote:

 

 Just when I think I have thought of everything in my G3X installation something else comes up.  I have a GTX23ES transponder that is a a remote mount.  I decided to mount it in the tail section where the rear battery mount is.  It worked well there because of weight and balance and I figured my cable run to the Antenna would be short and out of the way of everything else.  I missed a requirement in the Garmin Manual that says the Antenna should be 3 feet from the unit.  I plande to out eh antenna just behind unit on the belly.  I will also have a ADSB antenna on the rear belly and know that it needs to be 3' from the T-ponder antenna according to gamin.

 

 Am I correct in assuming that the same RF problem will exist with the ADSB being to close to the transponder unit itself ?

 I have found at least one Installer that has the transponder unit within a foot of the antenna and has had no problems.

 

 Trying to keep all the antennas separated on the RV8 is not easy.

 

 

 Any thoughts on this are appreciated.

 	
	
 

 

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