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Dennis Jones
Joined: 17 Sep 2006
Posts: 45
Location: Poplar Grove, IL
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 Posted: Thu Jul 12, 2007 1:03 pm Post subject: Antenna |
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Bob
Would the steel tubes in the back of a tube and fabric airplane preclude an individule from mounting a rod type (or any other type) com antenna inside the tail of the aircraft? Would it help or hender the ground plane requirements?
Thanks again
Dennis
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Fri Jul 13, 2007 3:11 pm Post subject: Re: Antenna |
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Bob,
Normally a metal cage type structure will shield the antenna from radiating, if the cage openings are smaller than around 3 feet, that is assuming you mean to have the antenna inside the fuselage.
It is possible to actually connect to parts of the structure, at strategic points, and use the structre to radiate, in some cases, but this is a difficult process. If the matching point is not correct, the cable will radiate and cause problems for other avionics too.
For a tube / fabric airframe, antenn drag is not an issue, use a normal or swept back wire antenna, mounted at a tubing juncion or on a pice of metal panel as far away from the engine as practicable. For an Avid flyer, the rear turtledeck is aluminium and works well.
Ralph, radio tech in NZ
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_________________
Ralph - CH701 / 2200a |
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