My friend Tim (N9IW) has some nice stacked LPDA's up. A photo is shown on
the DXE website.
http://www.dxengineering.com/showcase.asp?ID={D68EF559-CBA2-48FD-90A4-EF233D
76B469}
73,
Jim N9WW
James Chaggaris
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-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of jim Jarvis
Sent: Friday, January 22, 2010 4:25 PM
To: w2lu; towertalk@contesting.com
Subject: Re: [TowerTalk] stacked LPDA's
Gene,
The early logs were a Collins Radio design, and used a split boom/tilt
system,
but it wasn't really stacked. The alternate dipole elements apparently were
on the upper and
lower booms. I don't pretend to understand how that system worked. No
intuition
at all on the topic, except that the booms were transmission lines, and some
sort of
progressive phasing resulted from the relationship.
But what I was talking about kind of LOOKED like that, just that the
alternate dipole elements
are fed in the Tennadyne design from alternate sides of a 200 ohm
transmission line, which is
formed by the spaced rectangular boom tubes. ( It's a really neat system,
btw)
I think the TV logs were a derivative of the Collins design.
W1KW's call is now owned by DK8KW, who lives near Houston, TX. So details
of
that early log are likely lost.
N2EA/ Jim
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