radials
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| Apr 3rd 2012, 19:59 | |
SIZE358Total Topics: 0 Total Posts: 0 |
On a 5/8 wave vertical antenna should the radials be 1/4 wave 5/8 wave or the longer the better ? Danny K5DRS |
| Apr 4th 2012, 00:25 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
The theoretical advantage of a 5/8 wavelength antenna over a quarter wave antenna requires a very large ground plane--the longer the radials the better. Studies have shown that the advantage goes away for small radial systems. Zack Lau W1VT ARRL Senior Lab Engineer |
| May 11th 2012, 01:32 | |
N9AATTotal Topics: 0 Total Posts: 0 |
I agree, the longer the better if you want a ground system. Shorter radials can become part of the radiating system itself. The radials for my multiband vertical are a ground plane for 10-15-20 with little affect on SWR (mostly angle). However, because of the length I've chosen they become "elements" on 40, which does directly affect my SWR. On 80-meters they don't seem to do me any good at all. Try using the EZNEC programs to experiment. With that you can also raise your system up and down relative to ground. |
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