[TowerTalk] 402cd

[alsopb]

Tom,

Exactly.  In fact, the portion of the curve looked at was appropriate
for each height.  It showed an increase in Z at 28 M relative to 24M. 
The curve is on page 3-2 of the 19th Edition of the ARRL Antenna
Handbook.

73 de Brian/K3KO

n4kg@juno.com wrote:
> 
> The feed impedance for a dipole varies similar to a damped
> sinusoidal waveform as height is varied so whether it
> increases or decreases depends on what part of the curve
> you are traversing.
> 
> Tom  N4KG
> 
> On Wed, 15 Aug 2001 alsopb <alsopb@gloryroad.net> writes:
> >
> > Marc,
> >
> > Just for kicks I ran EZNEC for a full sized 2 element beam (24'
> > boom) at 24 and 28 M height.
> >
> > 24 M    SWR =1.306  IMPEDANCE =38 -1.8j
> > 28 M  SWR =1.519  IMPEDANCE =33 -0.5j
> >
> > Interesting that the impedance actually decreases rather than
> > increasing with height as the dipole impedance plot vs height
> > predicts.
> >
> > I don't have a model for the 402CD.  It would be interesting to
> > actually run such a model at the two heights.
> >
> > Of course, these values are at the feedpoint.  What the reading
> > would
> > be at the shack end of the coax is unknown.
> >
> > 73 de Brian/K3KO
> >
> >
> ________________________________________________________________
> GET INTERNET ACCESS FROM JUNO!
> Juno offers FREE or PREMIUM Internet access for less!
> Join Juno today!  For your FREE software, visit:
> http://dl.www.juno.com/get/tagj.
> 
> List Sponsored by AN Wireless:  AN Wireless handles Rohn tower systems,
> Trylon Titan towers, coax, hardline and more. Also check out our self
> supporting towers up to 96 feet for under $1500!!  http://www.anwireless.com
> 
> -----
> FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
> Submissions:              towertalk@contesting.com
> Administrative requests:  towertalk-REQUEST@contesting.com
> Problems:                 owner-towertalk@contesting.com

List Sponsored by AN Wireless:  AN Wireless handles Rohn tower systems,
Trylon Titan towers, coax, hardline and more. Also check out our self
supporting towers up to 96 feet for under $1500!!  http://www.anwireless.com

-----
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com