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DXER Ham Radio DX News

The latest dx news/current propagation and more. Visit mike's Amateur Radio Page at www.qsl.net/swlham

Sunday, February 4, 2018

Commercial versus homemade open line

Previously I wrote about the inverted-V I mounted in the mast as emergency antenna. Since the PACC contest is coming up I wanted to upgrade a little and made myself a more solid open line. The commercial brand I used was 450 Ohm JSC #13AWG open line, I think it is good quality but I connected about 3 or 4 pieces together to get the length I need. The inverted-V was also made from some pieces of wire which were leftovers from another antenna project. Now for this inverted-V I also use 2,5mm2 (#13AWG) but this time there are no connections. The whole antenne is made from 2 pieces of 50m wire. Spreaders for the open line are plastic fruitclips. Unfortunately I could not see any signal increase at receiving compared to the old inverted-V but I think the difference will be the weather impact on the open line and antenna. How it radiates in not certain yet? Have to test it first. The only thing that is different are the tuner settings due to a different impedance. Hopefully it will be good for the PACC next weekend. I'm not really satisfied with this antenna, it has to proof itself first. Compared to my 84m long horizontal loop I used in the previous years I can't say it's good. Compared to my homemade multiband vertical it's about the same on 60-10m and a little better on 80m. I can use it on 160m but the vertical is far better. The horizontal loop couldn't be tuned on 160m but was better compared to my vertical from 80-15m. It's nice to have a comparisation antenna so you can see what a new antenna is doing. Next step will be the moving the vertical from the old mast (9m asl) to the new tower (16m asl). The problem is it is impossible ( impractical)  to attach radials below the vertical. Using the mast as counterpoise is an idea but it will have a strange impact on the radiation pattern at the higher bands. Have to study what the best option is.


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