[TowerTalk] Brainstorming: A homebrew Steppir like beam....

[GALE STEWARD]

AS I recall, back in the late 60's or early 70's there
were some pictures in QST showing a 4 element yagi
that used air pressure/vacuum to extend or retract the
element ends. Think it was built be a ZL station.

73, Stew K3ND

--- on4kj <on4kj at skynet.be> wrote:
>   Hey Tom and All,
> 
>   Every body knows the famous pneumatic mast used in
> the army.
>   Ever some body tried it the horizontal way to tune
> the antenae ?
>   Even the boom could then be adjusted.
>   A real programmers delight to control the system.
>   I just waked up half an hour ago....hi hi
> 
>   Jos on4kj
>   ________________________________________________
> 
>   ----- Original Message ----- 
>   From: "Tom Rauch" <w8ji at contesting.com>
>   To: "Rob Frohne" <frohro at wwc.edu>; "Richard (Rick)
> Karlquist (N6RK)"
> <richard at karlquist.com>
>   Cc: <towertalk at contesting.com>
>   Sent: Monday, April 26, 2004 7:28 AM
>   Subject: Re: [TowerTalk] Brainstorming: A homebrew
> Steppir like beam....
> 
> 
>   > For those concerned about the BeCu issue you can
> read this
>   > link carefully.
>   >
>   >
> http://ehp.niehs.nih.gov/docs/2001/109-2/focus.html
>   >
>   > I'm always a little reluctant to believe a
> single report by
>   > a single source in issues like this, when
> hundreds of others
>   > have looked unsucessfully. It reminds me of the
>   > electromagnetic cancer scare that was faked with
> bad data
>   > and all the problems it caused.
>   >
>   > I certainly would never worry at all about
> stamping,
>   > cutting, or punching BeCu. None of that creates
> dust, and
>   > the dust is the POSSIBLE danger. The solder we
> use is very
>   > likely a much more dangerous long term.
>   >
>   > 73 Tom
>   >
>   >
>   > _______________________________________________
>   >
>   > See: http://www.mscomputer.com  for "Self
> Supporting Towers", "Wireless
> Weather Stations", and lot's more.  Call Toll Free,
> 1-800-333-9041 with any
> questions and ask for Sherman, W2FLA.
>   >
>   > _______________________________________________
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>   > TowerTalk at contesting.com
>   >
>
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>   >
> 
> 
> _______________________________________________
> 
> See: http://www.mscomputer.com  for "Self Supporting
> Towers", "Wireless Weather Stations", and lot's
> more.  Call Toll Free, 1-800-333-9041 with any
> questions and ask for Sherman, W2FLA.
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
>
http://lists.contesting.com/mailman/listinfo/towertalk



	
		
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