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![]() "Richard Clark" wrote in message Google for "Sleeve Dipole" (a vertical) which consists of staged tubing, the upper element insulated from the lower. Do not connect the lower element to ground. Thread the driveline coax up inside the lower element and connect the shield to the top inside of the lower element. Connect the coax inner lead to the bottom of the upper element. As I said, google for images as this description may frustrate you. Invest the rest of your money (after buying sufficient quantity of tubing) in your tuner. You may still have a lot left over. 73's Richard Clark, KB7QHC One of these for 10m was the first HF antenna I ever built. I wish I had known then about decoupling the feed line, as I never could get repeatable VSWR data, possibly due to common mode current. Maybe I'll rebuild it and try again with a suitable choke. I read about the sleeve dipole before I built it and I will pass on a caution: The end where the cable comes out is a high voltage point (expected for the ends of dipoles); higher powers may punch through the coax outer jacket to the coax shield. I use a piece of PVC plumbing pipe as additional separation inside the lower element and never had an issue. "Sal" Happy building. |
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