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EZNEC question
I'm trying to model an antenna that starts with the "vert1.ez" descripton
(included with the program)and adds one additional wire that runs parallel to and within 1/4 inch from the original wire but is insulated from it on end 2 and is connected to it on end 1. The added wire is twice as long as the original. I want to model it at the original frequency (7 MHz)and also at one half the original frequency. The idea is to have a quarter wave 40 meter vertical running parallel with a quarter wave 80 meter vertical. Both are fed from the same source on the ground end. The 80 meter ant. should be a half wave at 40 meters and present a high Z back at the source on 40 meters. The 40 meter ant. should be a one eighth wave at 80 meters and present a capacitive Z back at the source on 80 meters. I'm wondering if such a antenna would be useful on both frequencies. I'm guessing the capacitive reactance of the 40 meter would screw up the swr on the 80 meter. But the problem is I get an "unknown error" pop up message when I try to run the program. Any help would be appreciated. Ron W4TQT |
#2
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Please email the description (.EZ) file containing the model to me so I
can take a look at it. Roy Lewallen, W7EL Ron wrote: I'm trying to model an antenna that starts with the "vert1.ez" descripton (included with the program)and adds one additional wire that runs parallel to and within 1/4 inch from the original wire but is insulated from it on end 2 and is connected to it on end 1. The added wire is twice as long as the original. I want to model it at the original frequency (7 MHz)and also at one half the original frequency. The idea is to have a quarter wave 40 meter vertical running parallel with a quarter wave 80 meter vertical. Both are fed from the same source on the ground end. The 80 meter ant. should be a half wave at 40 meters and present a high Z back at the source on 40 meters. The 40 meter ant. should be a one eighth wave at 80 meters and present a capacitive Z back at the source on 80 meters. I'm wondering if such a antenna would be useful on both frequencies. I'm guessing the capacitive reactance of the 40 meter would screw up the swr on the 80 meter. But the problem is I get an "unknown error" pop up message when I try to run the program. Any help would be appreciated. Ron W4TQT |
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