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TRANSPONDER ANTENNAS

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RV4WGH(at)aol.com
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Posted: Sun Feb 25, 2007 5:35 pm Post subject: TRANSPONDER ANTENNAS

I am in the process of locating mounting two transponder antennas.   One for my GTX-327 and one for an ATD-200 traffic detector.

  

 I plan for my comm antenna to be mounted about 10 inches behind the  firewall and mid point side to sideHas anyone mounted their transponder antenna  on the "floor" piece that extends beyond the fuselage sides for attachment to  the lower wing skin? I can meet the 3 foot separatation to the transponder  antennas and the two foot separation between them by mounting one on each  side.  Alternative would be to mount all in tandem with required separation  but his would require a longer cable run.

  

 Thanks for any suggestions or comments.

  

 Regards,

  

 Wally Hunt

 RV-4 Finishing Kit

 Rockford, IL



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Jerry Grimmonpre'

Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142

Posted: Sun Feb 25, 2007 6:11 pm Post subject: TRANSPONDER ANTENNAS

Wally ...

 I know there needs to be a 22" ground plane around the mounting point of  the comm ant ... that has been specified on the AeroElectric-List by Bob  Nuckolls.  That's the only answer I can give to your questions.  To me  that means 22" circle all around the mount.  You could ask the questions of  the AeroElectric-List and get answers on the others.

 Jerry Grimmonpre

 RV4 

 Huntley, IL

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smokyray(at)yahoo.com
Guest

Posted: Mon Feb 26, 2007 4:27 am Post subject: TRANSPONDER ANTENNAS

Wally, 

  I have flown a bunch of RV4's and most had their transponder antenna on the belly, about 24" aft of the firewall. I had mine in the same position for the first 1000 hours. Since then I have experimented with several places on my RV4 including where you mention. They all worked fine except for under my cowling which was reported "weak". 

  My goal was to put ALL my antennas hidden inside the airframe behind fiberglass. To do this I installed my comm antenna in the left gear leg fairing,  transponder in the wingtip and ELT inside the cockpit. They all work well...



Rob Ray



RV4WGH(at)aol.com wrote:[quote]     I am in the process  of locating mounting two transponder antennas.   One for my GTX-327 and one for an ATD-200 traffic detector.

  

 I plan for my comm antenna to be mounted about 10 inches behind the  firewall and mid point side to sideHas anyone mounted their transponder antenna  on the "floor" piece that extends beyond the fuselage sides for attachment to  the lower wing skin? I can meet the 3 foot separatation to the transponder  antennas and the two foot separation between them by mounting one on each  side.  Alternative would be to mount all in tandem with required separation  but his would require a longer cable run.

  

 Thanks for any suggestions or comments.

  

 Regards,

  

 Wally Hunt

 RV-4 Finishing Kit

 Rockford, IL



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Jerry Grimmonpre'

Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142

Posted: Mon Feb 26, 2007 4:58 am Post subject: TRANSPONDER ANTENNAS

Hi Rob ...

 Can you please expand on the comm antenna in the left gear  leg?  It obviously had to be a straight whip.  How did you fasten it  to the structure of the leg, how did you ground the antenna mount?  How  close to the fuselage was the base of the antenna?  How long was the  antenna?  How did you prevent the whip part of the ant from touching the  gear leg and grounding out.  Is the comm antenna still inside the fairing  and working good?  This really blows holes in the idea that comm antennas  need a flat ground plane.  Sorry for so many questions.

 Thanks for your answers ...

 Jerry 

 RV4

 Huntley IL

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smokyray(at)yahoo.com
Guest

Posted: Mon Feb 26, 2007 5:19 am Post subject: TRANSPONDER ANTENNAS

OK Jerry, one question at a time. First, I used one of the the copper tape "canopy antennas" in Vans catalog and glued it into the fiberglass leg fairing. I attached the connector at the top with a BNC and ran the wire into the cockpit with my brake line. 

  My thinking was that it had no ground plane taped into the canopy so why should it need one there? I had a whip antenna connected to the wing fairing on my Tcraft for years and it worked great with a handheld. The leg antenna works good.  One improvement might be to use a fiberglass straight antenna inside the fairing with the base removed. The cost of the copper antenna was so cheap that I couldn't resist. 



   Since the letters EXPERIMENTAL are on the side of my airplane, I like to excercise it...good luck!



RR



Jerry Grimmonpre <jerry(at)mc.net> wrote:[quote]        Hi Rob ...

 Can you please expand on the comm antenna in the left gear  leg?  It obviously had to be a straight whip.  How did you fasten it  to the structure of the leg, how did you ground the antenna mount?  How  close to the fuselage was the base of the antenna?  How long was the  antenna?  How did you prevent the whip part of the ant from touching the  gear leg and grounding out.  Is the comm antenna still inside the fairing  and working good?  This really blows holes in the idea that comm antennas  need a flat ground plane.  Sorry for so many questions.

 Thanks for your answers ...

 Jerry 

 RV4

 Huntley  IL

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gjslutz

Joined: 07 May 2007
Posts: 1
Location: Ohio 2d7

Posted: Mon May 07, 2007 4:01 am Post subject: Re: TRANSPONDER ANTENNAS

After looking at Tracy Saylor's RV-6 (at) OSH I did the same. I moved my transponder ant. to a 8" dia. plate I attached below the engine under the cowl. It has worked well for a few years now.



My com antena in the gear leg didn't do as well. It had low range. I'm not sure what was wrong whith my com ant. as others have worked ok.

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