| The Double Zepp | The W3EDP | Longwire with MTFT | Fan-Dipoles | Vertical-L |
Fan-Dipoles for the Shortwave Bands (by DK7ZB)
| After a lot of experiments with fan-dipoles here some proven
examples for such antennas. Not all combinations are working
properly. If the frequencies are to close together the impedances
will lead to a very bad SWR. This happens with the bands 10-12-15m
or 15-17-20m. Optimal are the combinations 10-15-20m for the classic bands and 12-17-30m for the WARC-bands. The antennas are fed with current baluns and are performed with insulated wire for electrical installations with a 1,5 mm2 stranded copper-wire. |
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The insulated copper braid |
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The spreaders for the fan-dipoles
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The 1KW-Current Balun with a FT240-43 core and 2x4 turns Aircell-5 |
The 400-Watt Current Balun with a FT140-43 core and 2x5turns of PTFE-coax cable |
Lengths for one half of the dipoles
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| Lengths of the 10-15-20m-Dipole | Lengths for the WARC-Dipole | Lengths for 20+40m |
| If the resonance of the frequencies are not correct, you can use the table for the correction per 100 KHz. With an ATU the 20+40m-dipole can be used on 15 m too, with good results.
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