Garry wrote:
> ... I wonder why the antennas at
> WWV are using ground planes with 9 radials? Nine just seems like an odd
> number and I wondered if there was a reason for this number as I don't
> see any explanation on their website.
Nine (9) is in fact an odd number. But those wires are not actually
radials. The WWV antennas are half-wave verticals, that is dipoles, not
monopoles. The bottom half of each antenna is constructed to be both the
lower half of a dipole and the guy-wire support system for the antenna.
Here is a URL for a document file that gives a NIST/WWV description,
including some details of the antenna construction:
http://www.w5qx.org/PDF/June%202004%20Kilo-What.pdf
Gus Hansen
KB0YH
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