Keeping an NVIS Antenna Legal on 60 Meters

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2 Responses

  1. K1OIK says:

    Have you compared your NVIS antenna to an 87’3″ dipole antenna, modeled using the same software both times? This would be more of a fair comparison, and I think you will be surprised at how overly-complicated you have made this. And it would be more compliant with the regulation that you are trying to satisfy, that is, “antenna gain relative to a dipole”. It doesn’t say anything about an isotropic radiator in 97.313(i). Ground loss, coax cable loss, connector loss, dipole antennas have these things, so when you start with an isotropic antenna, you are changing the equation and thereby not doing the thing that they are describing in these rules. What I am saying is that if you model a (very standard) dipole antenna using your configuration, you will find that it has gain over a dipole. Since that makes no sense on its face, you might want to re-think your basic premise.

    I’m glad that you actually deployed the antenna instead of sitting around looking at a model on-screen, but it would have been awesome if you actually took some field strength measurements and compared that to a dipole, or really any kind of qualitative measurement instead of saying you were “59” somewhere.

  2. rexington says:

    Awesome. Can you describe your antenna? I’m curious about the assertion that NVIS antennas have gain over a dipole — mine certainly doesn’t!

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