Weather Station from ON4LDZ - Zaventem - Belgium
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My QFH antenna |
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| Looks great | The varnish is already done | First contact with a scanner, not very good, but encouraging | ||
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Bend tool |
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To build the antenna, I have first used the JAVA calculator from Jean-Coppens with the following value.
Design frequency = 137.5 MHz
Number of turns = 0.5
Length of one turn = 1
Bending radius = 10 mm
Conductor diameter = 12 mm
Width/height ratio = 0.44
* This program can also be used to generate a map with variant radius without a mix of WXtoIMG composites.