On 1/25/2013 9:34 AM, William Powell wrote:
Anyone out there ever try to shunt feed a LARGE tower on 160 / 75?
By LARGE I mean a 200' - 250' free-standing 30' face tower covered with 3' - 8'
dishes and a plethora of fiberglass omni sticks.
Almost ten years ago, I had the use of a similar tower, about 150 ft, a
decommissioned AT&T Long Lines site on a mountain top. I chose the
option of hanging sloping dipoles off the tower and feeding them from
the center. The tower was tall enough that I was able to hang a dipole
that was a full half wave on 80M and had loading coils with about 25 ft
of additional length for 160. It worked VERY well. I was able to work
anything I could hear with 100W during a CQ160CW, and the site was dead
quiet, so i could hear a LOT, The bottom end of the dipole was about 10
ft above the ground. In this sort of arrangement the tower acts as a
passive reflector, yielding a few dB of gain in the direction of the
sloping wire.
73, Jim K9YC
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