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R. Scott wrote:
Question I assembled it per the instructions for the band parts I wanted. I triple measured and Up she went. I'm really Low (as in instead of 14.150 its down around 13.950) And I just noticed yesterday looking up that the director seemed a bit longer than the driven. And I know as per the first line, I assembled it to the tee for per the instruction sheet. Suggestions ? I had a similar issue with an A3S that's used during Field Day. It turned out that the PVC caps on the ends of the traps weren't pushed-on flush with the ends of the traps. We found this when double-checking the overall length of the elements -- they were a few inches long, even though the intermediate lengths appeared to be correct. Make sure the PVC caps are pushed *all the way* onto the traps. You may also experience some aberration in the resonant frequency if you don't have adequate decoupling of the feedline's shield from the DE feedpoint. Cushcraft recommends winding several turns of feedline into a coil as close as possible to the DE feedpoint. You can also use a 1:1 balun of your favorite flavor. Vy 73, Bryan WA7PRC |
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