Strojenie YAGI 2m/70cm

Wpis ze strony DK7ZB 2m-Yagis with the 50-Ohm-DK7ZB-Choke I use stretched dipoles with an isolated middle part and a coaxial lambda/4-choke. The choke has 5 windings with RG-174 (for 100Wtts) or RG-188- Teflon (for 200Wtts) on a piece of PVC-tube with 16mm diameter. You can use this construction instead a 200/50-Ohm folded dipole (easier to tune!) in other descriptions. Right is a choke with RG 58 coax of good MIL-quality. There are some inferior cables on the market for CB-use with a very thin shield, avoid such products! Use cable with a full-PE insulation, foam cable is very bad for bending it to a choke. This choke has 5 turns on a 20mm-PVC-tube and can handle 200 Wtts CW/SSB. With these chokes you have no common mode currents on the outer side of the coax-shield and a symmetrical pattern. Źródło -> http://www.qsl.net/dk7zb/2m-short/detail.htm

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