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Transponder and/or ADSB Antenna Installation and Radiation

 
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ceengland7(at)gmail.com
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PostPosted: Sun Jul 26, 2020 3:12 pm    Post subject: Transponder and/or ADSB Antenna Installation and Radiation Reply with quote
Don't forget that while a homebrew ELT antenna may work better than the supplied version, it probably isn't legal. Unlike most radio stuff, the antenna is usually part of the certification of the ELT, and ELTs must be certificated in the USA; even in homebuilts. 
Won't matter until that picky a/w inspector comes to sign off the plane, or if you get past that, dealing with the Insurance company after you survive a crash. 

Charlie
On Sun, Jul 26, 2020 at 11:42 AM <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:

Quote:

Thanks Bob for the information…greatly appreciated.
 
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) <owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)> On Behalf Of Robert L. Nuckolls, III
Sent: Wednesday, July 22, 2020 9:17 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Re: AeroElectric-List: Transponder and/or ADSB Antenna Installation and Radiation
 
Quote:


So the questions are:

-Is the ground plane better to be square/ round/ or hexagon/ or some other shape?


  Why not eliminate the need for ground planes with
  vertically polarized dipoles mounted to inside surfaces
  of empannage?

https://tinyurl.com/y3w4hf8y
Quote:

-If the diameter of the ground plane cannot be exactly a square and the same dimension as indicated on the installation guide what is the problem(s) with it being slightly to wide or slightly too narrow than spec, or if the antenna is not installed in the exact center?


  ditch the ground planes

Quote:

-The book says the two antennae should be mounted at least two feet from each other so what if they were installed closer…or even co-located on the same ground plane?


  Mount one on left side forward, the other
  right side aft. Getting separation shouldn't
  be a problem.

Quote:

-What about mounting these masts near human body parts (ouch)?

-What about mounting these masts near other avionics or other electrical equipment?


  back in the tail?

  Bob . . .



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cluros(at)gmail.com
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PostPosted: Mon Jul 27, 2020 2:37 pm    Post subject: Transponder and/or ADSB Antenna Installation and Radiation Reply with quote
The insurance company will not have anything to say about it unless there is some weird liability claim arising from a failure of the ELT. Not worth worrying about.

On Sun, Jul 26, 2020, 16:18 Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

Quote:
Don't forget that while a homebrew ELT antenna may work better than the supplied version, it probably isn't legal. Unlike most radio stuff, the antenna is usually part of the certification of the ELT, and ELTs must be certificated in the USA; even in homebuilts. 
Won't matter until that picky a/w inspector comes to sign off the plane, or if you get past that, dealing with the Insurance company after you survive a crash. 

Charlie
On Sun, Jul 26, 2020 at 11:42 AM <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:

Quote:

Thanks Bob for the information…greatly appreciated.
 
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) <owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)> On Behalf Of Robert L. Nuckolls, III
Sent: Wednesday, July 22, 2020 9:17 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Re: Transponder and/or ADSB Antenna Installation and Radiation
 
Quote:


So the questions are:

-Is the ground plane better to be square/ round/ or hexagon/ or some other shape?


  Why not eliminate the need for ground planes with
  vertically polarized dipoles mounted to inside surfaces
  of empannage?

https://tinyurl.com/y3w4hf8y
Quote:

-If the diameter of the ground plane cannot be exactly a square and the same dimension as indicated on the installation guide what is the problem(s) with it being slightly to wide or slightly too narrow than spec, or if the antenna is not installed in the exact center?


  ditch the ground planes

Quote:

-The book says the two antennae should be mounted at least two feet from each other so what if they were installed closer…or even co-located on the same ground plane?


  Mount one on left side forward, the other
  right side aft. Getting separation shouldn't
  be a problem.

Quote:

-What about mounting these masts near human body parts (ouch)?

-What about mounting these masts near other avionics or other electrical equipment?


  back in the tail?

  Bob . . .




- The Matronics AeroElectric-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:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
ceengland7(at)gmail.com
Guest
PostPosted: Mon Jul 27, 2020 7:27 pm    Post subject: Transponder and/or ADSB Antenna Installation and Radiation Reply with quote
I'd strongly suggest reading your policy. Unrelated violations of the FARs have been used in the past to deny coverage. Avemco denied *liability* coverage to a guy back in the early '90s, when his crash did hundreds of thousands of dollars of damage to structures on the ground. The denial was based on an unlogged system change that was made, and then changed back to the original configuration prior to the accident, and had nothing to do with the accident.

Charlie

On 7/26/2020 6:49 PM, Sebastien wrote:

Quote:
The insurance company will not have anything to say about it unless there is some weird liability claim arising from a failure of the ELT. Not worth worrying about.

On Sun, Jul 26, 2020, 16:18 Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

Quote:
Don't forget that while a homebrew ELT antenna may work better than the supplied version, it probably isn't legal. Unlike most radio stuff, the antenna is usually part of the certification of the ELT, and ELTs must be certificated in the USA; even in homebuilts. 


Won't matter until that picky a/w inspector comes to sign off the plane, or if you get past that, dealing with the Insurance company after you survive a crash. 



Charlie


On Sun, Jul 26, 2020 at 11:42 AM <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:

Quote:

Thanks Bob for the information…greatly appreciated.
 
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) <owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)> On Behalf Of Robert L. Nuckolls, III
Sent: Wednesday, July 22, 2020 9:17 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Re: AeroElectric-List: Transponder and/or ADSB Antenna Installation and Radiation


 
Quote:


So the questions are:

-Is the ground plane better to be square/ round/ or hexagon/ or some other shape?


  Why not eliminate the need for ground planes with
  vertically polarized dipoles mounted to inside surfaces
  of empannage?

https://tinyurl.com/y3w4hf8y


Quote:

-If the diameter of the ground plane cannot be exactly a square and the same dimension as indicated on the installation guide what is the problem(s) with it being slightly to wide or slightly too narrow than spec, or if the antenna is not installed in the exact center?


  ditch the ground planes



Quote:

-The book says the two antennae should be mounted at least two feet from each other so what if they were installed closer…or even co-located on the same ground plane?


  Mount one on left side forward, the other
  right side aft. Getting separation shouldn't
  be a problem.



Quote:

-What about mounting these masts near human body parts (ouch)?

-What about mounting these masts near other avionics or other electrical equipment?


  back in the tail?



  Bob . . .




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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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