Today's Message Index:
----------------------
 
     1. 01:12 PM - Re: Revisiting a REALLY handy tool . . . (blues750)
     2. 03:15 PM - ADS-B Ground Plane Question (markfw)
 
 
 

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Time: 
01:12:49 PM PST US
Subject: 
Re: Revisiting a REALLY handy tool . . .
From: 
"blues750" <den_beaulieu@yahoo.com>
      
      
      LOL
      
      "...You'll begin to feel sorry 
      for the wire and shrink..."
      
      Thanks Bob
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=495454#495454
      
      

Message 2


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Time: 
03:15:12 PM PST US
Subject: 
ADS-B Ground Plane Question
From: 
"markfw" <markwheelermd@icloud.com>
      
      
      I will be mounting a uAvionix echoUAT ADS-B antenna on the belly pan of my cub.
      The vendor says to keep it 1 meter from my transponder antenna, which is mounted
      14" forward of the leading edge of my belly pan.
      
      The pan itself is an isosceles triangle with a 15" base and a length of 32". The
      pointy part of the pan is oriented facing aft.
      
      Thus I have to place my Rami blade antenna toward the narrow (aft) part of the
      belly pan to stay 1 meter away from the transponder antenna.
      
      My problem is that at the location that is sufficiently far from the transponder
      antenna the belly pan has narrowed so that it does not provide the 5" diameter
      circular ground plane that is apparently required.
      
      SO (after all that), my question is whether the ground plane is only the part of
      of the belly pan that is immediately adjacent to the antenna, or is it the whole
      belly pan?
      
      A related question is whether I can "cheat" the antenna forward a few inches? Since
      antenna radiated power varies inversely with the square of the distance does
      that imply that I could move the antenna 6' - 8" closer to the transponder
      antenna without a significant problem?
      
      I am just trying to establish what my boundary conditions are with respect to the
      antenna location.
      
      Thanks.
      
      Mark
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=495455#495455
      
      








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