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John Herminghaus
Joined: 09 Jan 2006
Posts: 6
Location: Siena Italy
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 Posted: Tue Jun 09, 2009 7:24 am Post subject: Ground planes |
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What is the acceptable/recommended resistance from a transponder antenna
to its ground plane. Have built your low ohm meter, so can measure in
milliohms.
Regards,
John Herminghaus
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_________________
John Herminghaus
Lancair IV-P
I-VVVV |
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 09, 2009 2:39 pm Post subject: Ground planes |
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At 10:23 AM 6/9/2009, you wrote:
| Quote: |
<catignano(at)tele2.it>
What is the acceptable/recommended resistance from a transponder
antenna to its ground plane. Have built your low ohm meter, so can
measure in milliohms.
|
If you pay attention to cleanliness and pressure
on the mounting hardware surfaces that make
contact . . . see:
http://aeroelectric.com/Pictures/Antenna/Comm_Antenna_Installation.gif
This shows a comm antenna with a base attached
with screws. If you're mounting a blade transponder
antenna the same rules apply.
If you're mounting one of these things . . .
http://aeroelectric.com/Pictures/Antenna/Transponder_1.jpg
then all of the "grounding" happens under the nut
(not the best place but the outside flange holds
the gasket). The internal tooth lockwasher under
the nut "bites" into the ship's inner skin for
ground.
In any case, it's unlikely that you'll measure anything
significant with the low-resistance ohmmeter. A bonding
meter measures in fractions of micro-ohms.
Bottom line is that 99.999% of all antennas installed
with reasonable care for cleanliness and pressure at
the critical joints are going to be just fine.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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