Re: NEC-LIST:(no subject)

Good day Peter.

See FJ Dietrich and RK Long, "An efficient moderate-size
vertical-incidence ionosonde antenna for 2-20 MHz polarization studies,"
IEEE Trans antennas and Propagation, Vol. AP-17, pp. 551-557, 1969.

Also consider crossed vertical deltas with appropriate 90 degrees phase
shift to switch between left and right circular polarization. (See for
example, HN Cones, "Interim report on experimental broad-band antennas
for vertical incidence ionospheric sounding," CRPL report 5-3, May 3
1948.)

For good measure also see HN Cones, HV Cottony, and JM Watts, "A 600 ohm
multiple-wire delta antenna for ionosphere studies," Journal of Research
of the National Bureau of Styandards, Vol. 44, pp. 475-488, 1950.

As an added wrinkle, you could also use an array of crossed loops, also
with phase switching, for receive. There was also an article by a
German colleague on an array of buried ferrite loops (the idea being you
can stick the array out in a pasture, toss a concrete slab over the top
of eeach element, and let the cows graze freely - they do love to
scratch themselves on the posts supporting elevated loops;-) ). If I
find this last reference, I will let you know.

Duncan Baker.

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