[TowerTalk] dipole z vs height

[David J. Sourdis - HK1A]

Interesting. Is the take off angle the same for all three grounds when simulated at certain height?

David  
HK1A
EC5KXA
AE5XQ


> Date: Wed, 20 Feb 2013 17:01:56 -0500
> From: K8RI-on-TowerTalk at tm.net
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] dipole z vs height
> 
> On 2/20/2013 12:47 PM, Dan Maguire wrote:
> > I'm a "visual" type guy, so I modeled Jim's 80m dipole at heights above ground from 10 to 30 meters using three different soil conditions.  Here's the picture-worth-a-thousand-words:
> > http://ac6la.com/adhoc/80m%20Dipole%20R%20vs%20Height.gif
> >
> > If you'd like to play with variations on this yourself, contact me off-list and I'll send you the ".weq" model file for use with AutoEZ.
> >
> > Dan, AC6LA
> > http://ac6la.com/
> >
> > --- On Wed, 2/20/13, Jim Lux <jimlux at earthlink.net> wrote:
> >
> >> Here's some sample data from a dipole at 3.68 MHz, with legs
> >> 19.646m long, copper wire.
> 
> My 80m fan dipole which is 95' on one end and 10 feet on the other is a 
> tad under 30 ohms , measured.
> 
> The 40 m half wave center fed sloper is resonant at 7.200 where Z=402 
> bur Z ranges 42.56 @7.144 to  a low of 38.76 @ 7.000
> 
> Top is roughly 85' angle is roughly 50 deg
> 
> I don't have the fan dipole connected at the moment so I can't give 
> actual numbers.
> 
> 73
> 
> Roger  (K8RI)
> 
> 
> 
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