[IRCA] CKDO

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

Maybe it's an error in the FCC AM database, but if one is to believe the
database, CKDO added or replaced a tower as part of its move from 1350 to
1580. According to Bob Carpenter's AMSTNS program, which uses the FCC
database, the two towers that CKDO uses on 1580 are both 110 degrees high
(not high enough to meet Class A minimum efficiency--but when did the CRTC
or Industrie Canada ever care about that?). On 1350, CKDO used four towers
by night and three by day. One of the four nighttime towers was 94 degrees
high, the correct height to be 110 degrees at 1580, but the other three were
all 60 degrees, as were the three used for the 10-kW daytime operation on
1350. So, one can infer that, before the move to 1580, CKDO had a total of
five towers--three used by day, all 60 degrees high at 1350, and four used
at night, three of them 60-degrees high at 1350 and one 94 degrees high. Two
of the short towers were common between the day and night arrays. The new
setup (really DA-1, though documented as DA-2) appears to use the one tall
tower from the old night array plus one new tower of equal height.

Interestingly, WLIM has just been granted a CP to drop its two-tower 5-kW CH
operation and run 10 kW ND during the entire daylight period, thus no longer
protecting Canada during CH. If CKDO is a Class A, this would seem to
violate the US-Canadian agreement. In fact, given that Oshawa is several
hundred miles south of Chicoutimi, even the WLIM's 5 kW DA-CH pattern might
not have protected CKDO's 0.1 mV/m groundwave contour from CH skywayve
interference.

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





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