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ELT antenna inside tube and fabric fuselage

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Mar 07, 2013 11:29 am Post subject: ELT antenna inside tube and fabric fuselage

At 11:36 AM 3/7/2013, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Jared Yates <email(at)jaredyates.com>



 I have polyfiber leftovers to cover a box like that, and could use the opportunity as a covering demo/training for someone else. 



 	


    Great. I'm mulling over the geometry of a

    polyfiber 'test cell' that would facilitate

    relative attenuation measurements on a range

    of antennas. Structure for the cell should

    be RF transparent.



    I'm thinking of a cylindrical tube on the

    order of 6" diameter and 48" long covered

    with exemplar polyfiber finished fabric.



 [img]cid:.0[/img]



 

    The tube would have a single split-cut over

    half the length to a mast clearance hole in

    the middle. This would allow it to be

    slipped over dipole antennas covering our

    range of interest. I'm thinking of tests at

    130, 330, and 1000 Mhz which can be generated

    and measured with equipment I have.



    I wonder if a cardboard tube of the smallest practice

    thickness could be used as a former. I considered

    plastic DWV pipe . . . but these materials have some

    degree of RF opacity. I guess we could have two

    such tubes, one that's covered and one that is

    not covered. That would wash out effects of the

    plastic in the sandwich layers. Your thoughts

    and the thoughts of others are welcome.



    I'm negotiating a business arrangement

    with a OBAM aircraft magazine to do a regular

    flow of articles. This experiment might provide

    the 'meat' for a first article .



 

 

   Bob . . .

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email(at)jaredyates.com
Guest

Posted: Thu Mar 07, 2013 2:45 pm Post subject: ELT antenna inside tube and fabric fuselage

I don't know anything about the RF aspect, but what about two 4" pvc drain pipes, one bare and one coated with poly spray?  If the coating is the target variable, that would pretty well isolate it.    Another easy to find source would be a cardboard shipping tube, either circular in cross section or triangular. 

 





On Mar 7, 2013, at 14:28, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

[quote]  At 11:36 AM 3/7/2013, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)>



 I have polyfiber leftovers to cover a box like that, and could use the opportunity as a covering demo/training for someone else. 



 	


    Great. I'm mulling over the geometry of a

    polyfiber 'test cell' that would facilitate

    relative attenuation measurements on a range

    of antennas. Structure for the cell should

    be RF transparent.



    I'm thinking of a cylindrical tube on the

    order of 6" diameter and 48" long covered

    with exemplar polyfiber finished fabric.



 <ef90626.jpg>



 

    The tube would have a single split-cut over

    half the length to a mast clearance hole in

    the middle. This would allow it to be

    slipped over dipole antennas covering our

    range of interest. I'm thinking of tests at

    130, 330, and 1000 Mhz which can be generated

    and measured with equipment I have.



    I wonder if a cardboard tube of the smallest practice

    thickness could be used as a former. I considered

    plastic DWV pipe . . . but these materials have some

    degree of RF opacity. I guess we could have two

    such tubes, one that's covered and one that is

    not covered. That would wash out effects of the

    plastic in the sandwich layers. Your thoughts

    and the thoughts of others are welcome.



    I'm negotiating a business arrangement

    with a OBAM aircraft magazine to do a regular

    flow of articles. This experiment might provide

    the 'meat' for a first article .



 

 

   Bob . . .  

[b]

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bicyclop(at)pacbell.net
Guest

Posted: Thu Mar 07, 2013 3:49 pm Post subject: ELT antenna inside tube and fabric fuselage

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