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On Sun, 11 Jun 2006 09:35:31 -0700, dansawyeror
wrote: The first set of test measurements were taken on a 2-meter loaded vertical. What frequency? Two voltage readings were taken via a high impedance scope probe, This sounds like a set up to imagining better results than can be obtained. Scope probes are not magic detectors and what you describe, following, sounds like wishing: one at the feedpoint of the coax center connection, and the other from the connection of the coax shield to the antenna ground. A Scope probe has two (2) connections, and at any frequency in HF and above, their separation is going to have a significant impact on measurement. You never say just where the second lead goes for each voltage reading. If you made NO second connection (and just left that at up to the far end of the probe's connection to a mystery box) then you have definitely confirmed that dream is in Technicolor and surround-sound. In this case the ground is a simple raised metal 1/4 inch screen mesh about 10 square feet. This is rather less than fully descriptive as 10 square feet can take many forms. The antenna was tuned to resonance. The relative voltage readings were the center conductor was 2x the ground reading. I do not have a way to measure current at the base at this time. And this raises one particularly pointed question: Ground was at what potential with respect to ground? However looking ahead, with power = iv would this imply about 2 times the energy is being radiated from the vertical element as through the base? Hi Dan, There is far too much ambiguity in what you post. What is posted is fraught with conceptual problems. Basically, you've managed to obtain two voltages whose relationship is meaningless at best. I'm sure the potentials exist, but they define a circuit that has no practical application (and that circuit is NOT the antenna NOR its ground screen). In short, just what do you think you are achieving (another ambiguity)? 73's Richard Clark, KB7QHC |
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