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I have been following this reflector for about a month now. This is my first post. Just finnished assembling a C4S (C3S with 40M dipole) and here is a few of my thougths and findings on this antenna. At first I was put off by the riveting thing. Now I see the value and simplicity of construction and the ability to correct mistakes or make tunning adjustment. I have the antenna for testing purposed up on two 8 FT fiber glass step ladders. I am a RTTY contester so I have interest in the low end of 10/15/20M. No problem with 20 or 15M. On 10M even moving the tips last mounting hole still way high in band at 28,550 or so. As a test stuck a short lenght of copper tubbing in the ends with about 3 inches exposed. That brought it down right where I want it at 28,060. The EF-140 40M dipole resonates way low (at this test elevation) but moving the shorting bars out to 26 inches brought it down to 7060 Khz. Any body want to guess how much it will change as it goes up to 55 ft? Last but not least. Some one point me to an explanation of how the driven element system works on this antenna. It is very slick but escapes me how the 20M driven element parsitically drives the other two bands and exhibits a match on the those bands. I know I am missing something here and would just like a better understanding of how this antenna works. The antenna was easy to put together, rugged design and I amlooking forward to getting it on the air to give me SO2R capability in the near future. Russell N6EU -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |
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