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@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@contesting.com>
> To: "Rob Frohne" <frohro@wwc.edu>; "Richard (Rick)
> Karlquist (N6RK)"
> <richard@karlquist.com>
> Cc: <towertalk@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.
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> >
>
http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
>
> _______________________________________________
>
> 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@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.
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