so where does XWA Montreal fit into it?

Fri Mar 6 12:58:06 EST 2009

It would be interesting to know CKLW's NIF value. I suspect it is not
as low as you think. Between PJB and XELO (at least those were the two
call signs decades ago), there was a lot of QRM on 800. Neither of
those stations may have been very strong in New England, but southwest
of Windsor, their skywaves were pretty strong. Also, CKLW is nulled in
that direction at night and I've heard that it is largely inaudible in
Illinois at night. As for how CJAD was shoehorned onto 800, it was
possible because there was an 800 in Quebec City (CHRC?) that CKLW had
to protect. As a result, as you swung (and as you swing--CKLW's
pattern has not changed) northward from Boston, CKLW dropped off
fairly rapidly. If you look at CKLW's and CJAD's night patterns, they
are rather similar. Both are kind of L shaped with major lobes to the
north (northwest for CJAD; northeast for CKLW) and substantial lobes
to the east. Forgetting for the moment that CKLW is 50 kW-U but CJAD
is 10 kW at night, CKLW has the stronger eastern lobe. Another
interesting characteristic of CJAD is that despite its use of very
tall towers (195 degrees; unusual in Canada, where short AM towers are
quite common), its pattern RMSs are mediocre (~355 mV/m/kW @ 1 km,
whereas, you'd expect something close to 400). It should be possible
to achieve those RMS values with towers about 100' shorter than the
ones CJAD uses.

Dan Strassberg (
eFax 1-707-215-6367

----- Original Message ----- 
From: "Kevin Vahey" <>
To: "Garrett Wollman" <>
Cc: "Boston Radio Interest" <>
Sent: Friday, March 06, 2009 12:18 PM
Subject: Re: so where does XWA Montreal fit into it?

> CKLW's daytime signal is simply astonishing. In the Big 8 years not
> only did it rule Detroit but was also #1 in Cleveland and it also
> did
> well in Buffalo.
> Nights they were one of the strongest skywave signals in New
> England.
> A tip of the hat to the person who designed the pattern as it was
> about as perfect as you could get.
> On 3/5/09, Garrett Wollman <> wrote:
>> <<On Thu, 5 Mar 2009 13:08:09 -0600, Kevin Vahey
>> <> said:
>>> I would love to know how CKLW 800 Windsor wound up with an almost
>>> defacto clear channel. For most of its history it acted as a
>>> Detroit
>>> station until the CRTC clamped down with CANCON.
>>> Can it be traced to the fact that Windsor was in the most southern
>>> point of Canada?
>> Well, it's certainly well south of all the other Canadian 800s,
>> which
>> gives it a chance to have some east-west components in its night
>> pattern where all the others are oriented north-south (mostly
>> north).
>> -GAWollman

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