PI4CC
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The 80 meter band is relatively "wide": It spans 3,5 till 3,8 MHz, so the band width is almost 10%. To maintain an acceptable match without tuning, the width/length ratio can be reduced by using a "thick" dipole. This can be constructed in the form of a cage (4 wires, spread by plastic hoops). It gives an SWR of less than 1.5 across the whole band. We built a dipole this way and some pictures are found here. As always, we made sure that the feed point is perfectly symmetrical, and perfectly matched to 50 Ohms. Some construction details:
A short video with the dipole in 90 Km/h wind. |
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