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7-Element stacked |
7-Element-Yagis by DK7ZB in 28-Ohm-Design stacked for the 2m-Band
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These yagis and groups were designed with YO7.23 from K6STI and checked with EZNEC from W7EL. With a gain of 14/17/20dBd they have a good relation between gain and mechanical problems. A small elevation rotator (KR-500) can be used with the H-configuration 4x7 for satellite or EME-QSOs. The 17dBd are enough for EME with WSJT! The stacking distances are 3m for both planes and still handy. The vertical stacking of 4 Yagis gives an excellent contest group with a very low vertical elevation. The 8x7-Element group is a very high gain array for EME or terrestric work, such groups are built by OL7C and RW3AW. The described methods for the stacking can be used with other Yagis, too! The radiation resistance of each Yagi is 28Ohm, the DK7ZB-match is used for 50-Ohm-feeding. The pictures are screenshots of YO7.2. This 7-Element-28-Ohm-DK7ZB-Yagi has the highest gain and best F/R for CW/SSB/EME-use between 144 and 144,6MHz. |
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EME from Uruguay! The 4x7-El.-28-Ohm-Group built by Ricardo, CX2SC |
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Link to VE7TIL with additional informations for EME: http://www3.telus.net/sthed/eme/
Elementpositions and -lengths: Radiator 12mm, parasitic elements 10mm, 8mm or 6mm,
mounted with Polyamid clamps (see details for the other 2m-Yagis), updated data 08/2006
| Ref | Rad | Dir 1 | Dir 2 | Dir 3 | Dir 4 | Dir 5 | |
| Position | 0mm | 320mm | 595mm | 1145mm | 1825mm | 2615mm | 3260mm |
| Length(10mm) | 1008mm | 965mm | 937mm | 912mm | 892mm | 894mm | 884mm |
| Length(8mm) | 1010mm | 964mm | 944mm | 919mm | 900mm | 902mm | 887mm |
| Length(6mm) | 1014mm | 964mm | 952mm | 928mm | 909mm | 911mm | 896mm |
| Length(4mm) | 1014mm | 967mm | 960mm | 938mm | 920mm | 923mm | 908mm |
Gain, F/R, SWR and Z between 144,0 and 144,6 MHz for one Yagi
Element-current profile for 144,3 MHz
Horizontal pattern for one Yagi
Vertical pattern for one Yagi
