I still need to test it, but I made it. RG8X cable, a couple PL-259 connectors, and a F240-31 Toroid. The 240 is the overall diameter of the core and the 31 is the material type. This seems to be the right type to get based on various sources so I went with it. I got these from Palomar Engineers who seem to have a good reputation. There are a lot of ways to make a choke. I went with this because I didn't want a box and I had the materials. I have a couple more toroids so I'm going to make a couple more with various methods. The general recommendation is at least one choke so this is what I figured I'd start with. Like I said, I still need to test this to see if I built it right and also how well it works. This will be one of my portable ones. I'll build one into a box for my permanent installation at home.
The other thing I want to point out is figuring out what connectors you want to use. I went with the PL-259's and probably should have gone with one male and one female. It really depends on where you are going to put the choke. Most of the premade antennas like the EFHW types you can get like the one I got from Xtenna make use of bnc connections on the antenna. My coax that I got came with PL-259 on both ends but it also came with a PL-259 to BNC adapter so I can plug that right into the antenna. But if I want to put the choke there, I would want PL-259 to BNC ideally to reduce the amount of adapters needed. If I want to put it right off my radio, then Female to Male PL-259 would be what I need. But I only had the parts I used at this time. I'll keep adding to my parts inventory and the next one will be different.
- Take 3-4 feet of RG-8X coax and make sure you leave about the same amount on each end so you can attach the connectors
- Pull some of the coax through the center of the toroid and using a zip tie, secure it to the toroid. Make sure you don't make it too tight. That is one thing you want to make sure, don't pull too hard when you are wrapping especially if you are using thinner cable as you don't want to damage the cable itself. You want it snug.
- Wind the cable around the toroid 6 times counter-clockwise then cross over and wrap the opposite direction clockwise until you get back to where you started leaving you with a total of 12 turns.
- Use another zip tie to secure the exit from the toroid.
- Finish the ends of the RG-8X line with your PL-259 connectors.





No comments:
Post a Comment