Re: [IRCA] KKOL

["Dan Strassberg" <dan.strassberg@xxxxxxx>]

Scott wrote that KKOL's patterns send a narrow beam to the north. That can
be said of the night pattern, which uses all four towers--although the beam
is centered to the northwest, not the north. The "half-power" points
(relative to the equivalent power at the radiation maximum) are 88 degrees
apart. At zero degrees (due north), the signal, though still quite strong,
has already dipped below half of the equivalent power at the (313-degree)
radiation maximum. The signal strength falls pretty rapidly as you move
clockwise from due north; IIRC, the NIF contour does not cover a small area
on the east side of Seattle. The day pattern (three towers) is not narrow,
however. It resembles many two-tower figure eights. Although the radiation
maximum is pretty much due north, the signal strength over an arc of almost
100 degrees from the northwest to the east-northeast is greater than the
equivalent of 100 kW (based on the pattern RMS). The third tower is used
mainly to introduce a slight bit of asymmetry into the pattern; the two
minima are at 159 degrees (south-southeast) and 260 degrees
(west-southwest). Of these, the minimum at 159 degrees is the deeper of the
two; it brings the signal down to an equivalent power of 315W. In the
minimum at 260 degrees, the equivalent power is a skosh more than four times
as great: 1268W.

--
Dan Strassberg, dan.strassberg@xxxxxxx
eFax 707-215-6367




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