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My entry into HF has been a 10m sleeve dipole, discussed at length here
and still a work in progress. (The coax is out of the lower element, so it's just a vertical dipole.) More about that below. Today, at a local swap meet that features ham gear on the first Saturday, I bought a little tuner for $5.00. It got my puny TS-120 onto 15 meters and I talked to a guy in Pennsylvania. Hot stuff! That was my first QSO outside the local area, not counting IRLP. And this with an antenna that's mounted only 18 inches above the ground. I tried it on 20 Meters, but that was too much of a stretch. Very high VSWR no matter what. Antenna must get bigger. How to make antenna bigger? Add metal. I grabbed a three-foot piece of meter lead with alligator clips on both ends. I also grabbed a hank of TV coax and went out to the antenna (in the dark with a flashlight), intending to stretch out the coax and clip it to the end of the lower element of the dipole. I nearly tripped over a retracted aluminum extension ladder laying on the ground. Ah, fate! I immediately clip-lead-connected the ladder to the bottom of the lower element of the dipole and went back inside, taking the unused RG-59 with me. This time, the tuner had no trouble getting a very low SWR. I tuned around and heard a guy. I called him and he came right back. From Hawaii. He said I had a solid signal, although I'm sure his five-element beam was doing much of the work. I've heard stories about unusual antennas, including the one about "loading up the bedsprings" but I believe a ladder laying on the ground as part of an antenna is a novelty. I tried 40 meters and got a good match. I could hear people but nobody came back when I called. Maybe I needed to stretch out the ladder. Back to the subject of the original dipole. I got a 1:1 balun at the Ham Radio Outlet store in San Diego today after the swap meet. I will try fitting it to the dipole as a possible cure for feedline radiation. Also, I probably shouldn't have the dipole leaning against tree branches for support. 73, "Sal" |
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nec simulation - unexpected result ?? | Antenna |