Also works to explain affects of stacking yagis horizontally or vertically.
The same scenario demonstrates why vertical stacking provides gain with out
reducing beamwidth. Placing two boards on opposite sides of the balloon
and pushing inward would demonstrate how horizontal stacking produces gain
and narrowing the beamwidth. H frame stacking could be demonstrated by
placing boards on top, bottom and both sides. Sometime simple analogies
that one can visualize and /or actually see are very useful in education.
David
----- Original Message -----
From: "Christopher Boone" <cboone@earthlink.net>
To: "David Hinton" <ke4yyd@earthlink.net>; "John Geiger"
<johngeig@yahoo.com>; <vhfcontesting@contesting.com>;
<vhf@w6yx.stanford.edu>
Sent: Thursday, April 17, 2003 9:00 AM
Subject: Re: Re: Gain from an omnidirectional antenna
> EXCELLENT analogy....best way to show omni gain :)
> Good show!
>
> -------Original Message-------
> From: David Hinton <ke4yyd@earthlink.net>
> Sent: 04/17/03 08:09 AM
> To: John Geiger <johngeig@yahoo.com>, vhfcontesting@contesting.com,
vhf@w6yx.stanford.edu
> Subject: Re: Gain from an omnidirectional antenna
>
> >
> > John,
>
> Think about this analogy. Place a round balloon on a flat surface, put
> another flat surface on top of the balloon and apply pressure. The
> balloon
> will change shape spreading out horizontally but does not get larger in
> volume. This is similar to what happens when antennas are stacked
> horizontally.
>
> David
>
>
> ------
> Submissions: vhf@w6yx.stanford.edu
> Subscription/removal requests: vhf-request@w6yx.stanford.edu
> Human list administrator: vhf-approval@w6yx.stanford.edu
> List rules and information: http://www-w6yx.stanford.edu/vhf/
>
|