Juha, OH6XX and I spent 4 days at the station to make some changes with the antennas. Some time ago we bought a 20-15-10 meter triplexer with HP BPF’s from Ranko, 4O3A. To make the antenna switching more simple, we decided to go monobanders with the EU tower.
Last Thursday we took down the EU tribander stack and started to make 4 el OWA yagis for 20, 15 and 10. Kari, OH5LF came to make some modifications to the AC distribution network and the grounding of the station.
New yagis were completed on Friday and lifting up to the tower was scheduled for Saturday. Peter, OH5NQ and Kimmo, OH5KS came to help and the antennas were up in the tower in less than 2 hours.
20 meter yagi is based on G0KSC desing with re-modelled element tapering. 15 and 10 yagis were replicated based on 20 meter data.
On Sunday we ran a 135 meter hardline to the EU tower to complete the assembly. On 40 we have a 1/2 inch cable, on 20 a 5/8 and on 15 and 10 meters a 7/8 inch hardline.
Next time we will add some stackmatches, triplexer, BPF’s and 50 ohm switchable dummy loads together with 4O3A SAC X controllers to complete new antenna switching system.
Until the next time
73, Timo OG9X