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transponder & comm antenna separation RV-6/7

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sarg314(at)comcast.net
Guest

Posted: Sat Jun 09, 2007 7:11 am Post subject: transponder & comm antenna separation RV-6/7

I just read in my Garmin GTX327 transponder installation manual that I 

should "avoid" placing the transponder antenna within 3 feet of any comm 

antenna.  I assume because transmission on one can disturb reception on 

the other.



I was advised by one of the guys at Vans to place the transponder 

antenna under the passenger seat at the outboard side and the comm 

antenna under the pilot seat just left of the central channel, that is, 

in the "channel" adjacent to  the central channel.



I like this placement. It keeps the cables fairly short and the antennas 

aren't hard to get to.  I don't like that it puts the comm antenna 

fairly close to the gear legs (about 1/4 wave), but I guess you have to 

make some compromises.  However it puts the xponder only about 2 ft from 

the comm.



Has any one who has done this noticed any interference between the comm 

and transponder?

(or for that matter distortion of the comm transmission pattern due to 

the gear legs?)

--

Tom Sargent

RV-6A, electrical system.

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Hopperdhh(at)aol.com
Guest

Posted: Sun Jun 10, 2007 7:31 am Post subject: transponder & comm antenna separation RV-6/7

Tom,

 

I put my comm antenna on the left side of the plane and the transponder on 

the right side.  Both are about half way between the 2 outboard seat ribs and 

about 5 inches behind the spar.  For the comm antenna I used some leftover 

stiffener material between the ribs to help reduce flexing.  They are probably a 

little more than 3 feet apart.  I fed the cables along the floor on the left and 

right sides rather than have them in the center along with the other wiring.  

Everything works fine.  I have not noticed any problem with the gear leg 

affecting the antenna pattern, which is not to say that it doesn't have some 

effect.

 

Dan Hopper

RV-7A

 

 

In a message dated 6/9/2007 11:13:34 AM Eastern Standard Time, 

sarg314(at)comcast.net writes:




I just read in my Garmin GTX327 transponder installation manual that I 

should "avoid" placing the transponder antenna within 3 feet of any comm 

antenna.  I assume because transmission on one can disturb reception on 

the other.



I was advised by one of the guys at Vans to place the transponder 

antenna under the passenger seat at the outboard side and the comm 

antenna under the pilot seat just left of the central channel, that is, 

in the "channel" adjacent to  the central channel.



I like this placement. It keeps the cables fairly short and the antennas 

aren't hard to get to.  I don't like that it puts the comm antenna 

fairly close to the gear legs (about 1/4 wave), but I guess you have to 

make some compromises.  However it puts the xponder only about 2 ft from 

the comm.



Has any one who has done this noticed any interference between the comm 

and transponder?

(or for that matter distortion of the comm transmission pattern due to 

the gear legs?)

--

Tom Sargent

RV-6A, electrical system.



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rice737(at)msn.com
Guest

Posted: Sun Jun 10, 2007 8:54 am Post subject: transponder & comm antenna separation RV-6/7

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Hey Tom,

  

 I have about 12 hours on my RV8 with the trnxp ant. on the left side of the  fuselage and the comm on the right, closer than that of your RV6 with no  problems.  I say go ahead with your plan. Both my trxp and comm are garmin  also.

  

 Paul Rice

 N64PR

 [quote]   ---

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Gary.A.Sobek

Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

Posted: Sun Jun 10, 2007 11:02 am Post subject: transponder & comm antenna separation RV-6/7

Tom:



I have TWO comm antennas mounted on the floor forward of the SPAR as far 

outboard as I can get them.  I have the transponder antenna located exactly 

1/2 way between them. The transponder antenna runs down the center console 

to it.



My -6 has been flying almost 10 years.  I have over 2,000 hobbs hours on it.



KT-76A

GX-60

SL-30



I prefer to not run the coax aft of the spar.  I am able to reach one of the 

comm antenna while flying.  If I needed to connect a handheld to it, I 

could.  It is NOT easy but it could be done in an emergency.



Gary A. Sobek

"My Sanity" RV-6 N157GS O-320 Hartzell,

2,004 + Flying Hours So. CA, USA



   

<sarg314(at)comcast.net<mailto:sarg314(at)comcast.net>>



   I just read in my Garmin GTX327 transponder installation manual that I

   should "avoid" placing the transponder antenna within 3 feet of any comm

   antenna.  I assume because transmission on one can disturb reception on

   the other.



   I was advised by one of the guys at Vans to place the transponder

   antenna under the passenger seat at the outboard side and the comm

   antenna under the pilot seat just left of the central channel, that is,

   in the "channel" adjacent to  the central channel.



   I like this placement. It keeps the cables fairly short and the antennas

   aren't hard to get to.  I don't like that it puts the comm antenna

   fairly close to the gear legs (about 1/4 wave), but I guess you have to

   make some compromises.  However it puts the xponder only about 2 ft from

   the comm.



   Has any one who has done this noticed any interference between the comm

   and transponder?

   (or for that matter distortion of the comm transmission pattern due to

   the gear legs?)

   --

   Tom Sargent

   RV-6A, electrical system.



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emrath(at)comcast.net
Guest

Posted: Mon Jun 11, 2007 7:08 pm Post subject: transponder & comm antenna separation RV-6/7

Tom:  Gary is a good source and have been flying a long time, so he's

probably a good source of advice.  I've seen where some tri-gears have put

the transponder center forward up by the firewall, exiting between the

exhaust pipes but not in the way of any exhaust. Then mount dual com

antenna's forward of the spar on each side outboard as far as they will go.

Don't know how this works, however, but I may soon mount my antenna's this

way.  One for the com and one as a hook up for a stand-by handheld on the

pilots side.  Makes for short run of the transponder cable, that's for

certain.



Marty, loading radios in panel, RV-6A

Time: 12:02:38 PM PST US

From: "RV6 Flyer" <rv6_flyer(at)hotmail.com>

Subject: Re: transponder & comm antenna separation RV-6/7

Tom:



I have TWO comm antennas mounted on the floor forward of the SPAR as far 

outboard as I can get them.  I have the transponder antenna located exactly 

1/2 way between them. The transponder antenna runs down the center console 

to it.



My -6 has been flying almost 10 years.  I have over 2,000 hobbs hours on it.



KT-76A

GX-60

SL-30



I prefer to not run the coax aft of the spar.  I am able to reach one of the



comm antenna while flying.  If I needed to connect a handheld to it, I 

could.  It is NOT easy but it could be done in an emergency.



Gary A. Sobek

"My Sanity" RV-6 N157GS O-320 Hartzell,

2,004 + Flying Hours So. CA, USA

<sarg314(at)comcast.net<mailto:sarg314(at)comcast.net>>



   I just read in my Garmin GTX327 transponder installation manual that I

   should "avoid" placing the transponder antenna within 3 feet of any comm

   antenna.  I assume because transmission on one can disturb reception on

   the other.



   I was advised by one of the guys at Vans to place the transponder

   antenna under the passenger seat at the outboard side and the comm

   antenna under the pilot seat just left of the central channel, that is,

   in the "channel" adjacent to  the central channel.



   I like this placement. It keeps the cables fairly short and the antennas

   aren't hard to get to.  I don't like that it puts the comm antenna

   fairly close to the gear legs (about 1/4 wave), but I guess you have to

   make some compromises.  However it puts the xponder only about 2 ft from

   the comm.



   Has any one who has done this noticed any interference between the comm

   and transponder?

   (or for that matter distortion of the comm transmission pattern due to

   the gear legs?)

   --

   Tom Sargent

   RV-6A, electrical system.

- The Matronics RV-List Email Forum -

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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