| The "classic" DK7ZB-Match and principles | Full symmetrical 28-Ohm-Match by DF9IC | "Sperrtopf" by DF7DJ |
The DF9IC-Match for 28/50 Ohm
Especially for 70cm has a full symmetrical feed advantages, although the patterns of the "classic" DK7ZB-Match-Yagis are good. You need only an additional piece of lambda/2 of coax. The best choice is Teflon-cable RG-179 with 75Ohm. Henning, DF9IC, has developed an epoxy-board for the cables, look for the photos.
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The picture shows the scheme of the full symmetrical match from 28 to 50Ohm by Henning, DF9IC For shortwave and 50MHz the normal two lambda/4-cables wound as a choke would be a good choice. For 2m and 70cm you can get an advantage with the DF9IC-Match. |
The following pictures show all details of the DF9IC-solution for a group of 9-El.-70cm-DK7ZB-Yagis
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The production of 9-El.-28-Ohm-Yagis for a contest-group...
