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WLLZ Monroe-Detroit
On Sunday's LTAR, Bob mentioned that the tallest AM
tower in the US belongs to WLLZ-560, a 500W daytimer
licensed to Monroe MI, which is roughly midway between
Toledo and Detroit. I knew that WLLZ (once WQTE) was
directional--during the daytime anyhow--and I doubted
that any small AM (even one that purports to serve a
major market) would spend the bucks for four 1000'
towers. WLLZ has not done so. The 992' tower is used
only for the station's 14W ND night operation. Since
WLLZ is a Class D, the night signal need not reach the
COL. There's no chance of that, but the 14W signal
probably covers a lot of the Detroit metro decently.
Clearly, the tower must be a TV or FM tower and WLLZ
must use a skirt-fed antenna mounted on the tower.
WLLZ has had a curious technical history, and as you
might expect, based on the Detroit location and the low
dial position, a lot of it has to do with Canada. When
the station first went on the air, it was able to use
its full 500W beginning at 4:00 AM local standard time,
but those rules soon changed. Because of a co-channel
Canadian station (in Kirkland Lake ON, I believe) WLLZ
(then WQTE) was limited to some very small pre-sunrise
power (5.7W if memory serves), which eliminated coverage
of Detroit during AM drive (local sunrise out there
comes at 8:00 or 8:15 in January). The station has been
struggling ever since.
For a while, WLLZ had an "experimental" synchronous Tx
closer to Detroit. That Tx may have operated only at
night. Anyhow, given the short spacing to the co-channel
Canadian, which was pretty much due north of Monroe and
hence right in line with the strongest signal from the
WLLZ DA, 14W ND from a 203.4-degree (992') tower
probably covers the Detroit area as well as possible.
The ND signal and the low level of high-angle radiation
from the tall tower probably protect the Canadian pretty
well. (Most likely, the Canadian station has gone dark
by now anyhow.) Both the absence of the DA and the use
of the tall tower must explain why WLLZ was allowed
higher night power than the 5.7W it was permitted for
its pre-sunrise operation from the Monroe DA site.
Meanwhile, the Canadians busied themselves assigning 540
and 580 stations to Windsor ON (which is actually just
_south_ of Detroit--one of the few places where Canada
is south of the US). So WLLZ's 500W day signal, which is
quite good in Detroit considering the low power and the
distance, must run into the sidebands from its Canadian
neighbors in significant areas of the market.
--
dan.strassberg@att.net
617-558-4205
eFax 707-215-6367