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How do you put capacitors in? Is this a good slow wave solution?
CCD antenna use capacitors in a distributed way to cancel the inductance. They are commonly used in 1 wave dipole configurations. They have higher feedpoint impedances than 1/2 wave dipoles and they have 3 dB gain when fully stretched. Their pattern is figure 8, like a 1/2 wave dipole. The Vincent antenna could use such an arrangement to emulate a 1/2 wave monopole CCD (that is, a 1 wave dipole) where the 1/2 wave electrical length is wound into a helix along the height.. In any case, there are a number of ways of doing this. In my opinion, this is not new, if that is the case. I suspect that Vincent has a number of combinations of arrangements, depending on the desired height above 1/30 waves. Remember: these are not efficient antennas; they are slow wave antennas. Put lots of power into them and they will heat up; arc; and melt. They trade gain against efficiency. They are not multi or wideband. I would be very interested to know how hot a Vincent antennas when running 1500 watts continuous for an hour....If it's hot it's not efficient. 73, Chip N1IR. |
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