All, I¹ve received a number of emails from you and I¹ll send out a reply to the group.
This is an on-going experiment that I hope to have wrapped up in a few weeks. I¹m waiting on some material to arrive from eBay. Action items: 1. Using the PVC box instead of an aluminum box necessitates using a feed line choke. The material is coax to wind to make the choke. 2. Testing with a 500 ohm terminator. I¹m fabricating a test jig that will let me use jumpers to select the values for further testing. 3. Some have asked for detailed build instructions instead of paying me <grin>. Of course. I dislike it when people hide the designs as patented and proprietary when it comes to ham radio. 4. Some have asked me to do a presentation at a club meeting or 3. My health has been slowly improving so that¹s possible after the holidaze. Since the article was written, I¹ve developed a way to actually test the characteristic impedance of the flat transmission lines. If you look at the formula, it is a function of the diameter of the wires, the spacing and the dielectric constant of the material fine when you have a solid piece of material such as a TV twin-lead, less so when you have some other material. One very important item was left out of the article and will be in the revised article. Grounding. There is provision for a ground lead on the balun; however, I¹ve not installed a ground yet. The antenna, being balanced, does NOT require a ground for operation. This is especially important on 160-40m. A vertical needs a lot of ground plane for efficiency. Grounding at the balun is important for SAFETY. With a wire up 50¹ in the air, lightning happens. Any volunteer to help me install 2 ground rods? One at the antenna and one for the main station ground. 73! Bill Bill Crowell, N4HPG Pearland, TX Text messaging one-handed since 1982
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