so where does XWA Montreal fit into it?

Kevin Vahey
Fri Mar 6 13:09:33 EST 2009

CKLW makes it across Lake Michigan by day and is almost as strong as
WJR but at night the signal dies around Kalamazoo.

At night CKLW remains strong on the 401 through London but by Waterloo
CJAD kicks in.

On 3/6/09, Dan.Strassberg <> wrote:
> 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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