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Author Topic: Current Maximum Points on a Dipole's Feedline  (Read 675 times)
W5DXP
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« on: April 09, 2010, 01:22:33 PM »

If one knows the feedpoint impedance of a dipole and the Velocity Factor of the transmission line, one can calculate the current maximum points on the transmission line (using EZNEC's calculated feedpoint impedance). I have generated a DOS program that gives a graphical presentation of the current maximum points. One can change the length of the dipole while watching what happens to the location of the current maximum points. For what that's worth, it can be downloaded from:

http://www.w5dxp.com/IMAXGRAF.EXE
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73, Cecil, w5dxp.com
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73, Cecil, w5dxp.com
N2EY
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« Reply #1 on: April 09, 2010, 04:04:39 PM »

COOL!

Another tool in the antenna toolbox.

Thanks, Cecil!

73 de Jim, N2EY
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W5DXP
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« Reply #2 on: April 10, 2010, 08:30:22 AM »

Another tool in the antenna toolbox.

Try a 90 foot dipole with 40 feet of vf=0.9 ladder-line. Surprise, it's the ZS6BKW improvements to the G5RV that lines up the current maximum points on 40m, 20m, 17m, 12m, and 10m. I think a capacitive divider switched in for 75m operation will result in a 50 ohm impedance on that band.

Apr 11 - I have rev'ed the software to list the default frequencies (by band) on the opening page. The new Rev is 1.1 - Only the opening page has changed.
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73, Cecil, w5dxp.com
« Last Edit: April 11, 2010, 08:32:08 AM by Cecil A. Moore » Logged

73, Cecil, w5dxp.com
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