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On Feb 16, 10:35 pm, "Sal M. Onella"
wrote: "MTV" wrote in message ... Bill Bowden wrote: Anybody have a good antenna design for the new UHF digital TV stations? I get reasonable results from my old VHF/UHF antenna (55% signal strength) , but it's big and ugly, and I want to replace it with a smaller, more efficient UHF design (maybe a Yagi) I can construct at home. Anybody know the dimensions of such an antenna, probabaly in the frequency range of 400-800 Mhz ? -Bill You could just cut off the long VHF elements and use them, cut to UHF size, to extend and increase the number of director elements. MTV Yes. I have a seven foot TV parabola on my roof, but my next-best antenna is an absolute piece of junk, literally. My neighbor was throwing out an all-channel antenna that was blown down in a storm and badly damaged. I clipped the connections between the UHF & VHF sections and hacksawed off the mostly undamaged UHF section (12 directors, I think). With a section of pipe rudely jammed into the boom as a counterweight, I'm pulling in stations 125 miles away almost as well as with the parabola. Turning other people's discards into functional devices is an art. (I'm the guy who worked Hawaii on 20m with 100 Watts into an extension ladder. ... and no, I wasn't feeding it with ladder line.) "Sal" (KD6VKW) I found an old 5 element yagi cut for channel 52 which was used years ago for a pay TV station called "ON TV". It has 3 (10.5 inch) directors spaced apart 5 inches, one (12 inch) reflector and the driven element is about 11 inches. The diameter of all elements is a little larger than a coat hanger. Wondering what the bandwidth would be for other UHF stations below and above 52? And is there an easy way to modify it for wider band? I also need to get the high VHF band for channel 7-13, so maybe one more reflector is needed? -Bill |
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