＝Semi-Automation of 2 elements cross-yagi =
The construction of the antenna itself went smoothly, but I had to remake the “phase line” several times. This is a cross-Yagi or turnstile antenna, and is used to feed power to orthogonal radiators with a 90-degree phase shift in the radio waves. This allows these antennas to obtain circular polarization, allowing them to receive radio waves from satellites that are flying vertically, horizontally, or in any other orientation with a somewhat stable reception.
At first, I made it with a thin 1.5D2V coaxial cable, but it had seven core wires as thin as a hair. When I was processing it, I accidentally scratched it with a cutter and it broke after a while, so I gave up on using it for wiring in moving parts as I was a little afraid.
Instead, I tried using a 3D2V, which is often used to connect radios together, but it was extremely heavy. The phase-shifting wire alone weighed 115g, and the antenna itself weighed 126g, so it was almost the same weight.
I was having trouble, but recently I found out that there is a 2.5D2V, which made it 40g lighter. What’s more, the core wire is solid, making it easy to use. I managed to complete it.
We have confirmed that its performance as an antenna is decent individually using a field intensity meter and antenna analyzer, but the problem is its mechanical strength. But the chicken manages to hold up even when turned upside down. Even if it comes off, it is connected by a coaxial cable so it won’t fall. It might be a good idea to keep a backup of it connected with fishing line or something similar.
It made for a little study project while COVID-19 stayhome, but with the heavy rain I’ve had over the past few days, I had to wait for fair weather to set it up.