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Old August 27th 04, 02:44 AM
http://CBC.am/
 
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Default IBOC -- a way to jam skywave signals from Mexico and Canada at night, just like the USSR did with VOA, RFE/RL, ...

IBOC -- a way to jam skywave signals from Mexico and Canada at night, just
like the USSR did with VOA, RFE/RL, ...

The US AM band is so heavily overallocated already to meet the classical
cold war definition of jamming, with respect to being able to hear stations
in Canada during nighttime hours (no Canadian station operates at 50 kW at
night that I am aware of).






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Old August 27th 04, 07:13 PM
Bob Haberkost
 
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"http://CBC.am/" wrote in message
...
IBOC -- a way to jam skywave signals from Mexico and Canada at night, just
like the USSR did with VOA, RFE/RL, ...

The US AM band is so heavily overallocated already to meet the classical
cold war definition of jamming, with respect to being able to hear stations
in Canada during nighttime hours (no Canadian station operates at 50 kW at
night that I am aware of).


There are plenty of Canadian stations that run at 50kW. CKLW in Windsor, for one.
CBU in Vancouver, as well as CBC stations in Regina and Winnepeg, too (although
they've divested themselves of the 740 and 940 kHz operations in Toronto and
Montreal). There are still quite a few Canadian Clears, although some of those
channels, like 800kHz, are shared with Mexico, and thus run lower power or
directional patterns at night.
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Old August 27th 04, 07:13 PM
TK41C
 
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An interesting point aboit IBOC. Indeed, the AM band is over committed.

Aren't the stations on 740, 940, and 1070 50KW full time?

JB

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Old August 28th 04, 04:37 PM
David Eduardo
 
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"http://CBC.am/" wrote in message
...
IBOC -- a way to jam skywave signals from Mexico and Canada at night, just
like the USSR did with VOA, RFE/RL, ...


What possible interest would anyone in the US have in listening to a radio
station form Mexico, unless they live on the border and the Mexican station
is attempting to serve both sides. Otherwise, Mexican AM stations are
programmed to serve very local audiences within Mexico.

Wanada has a number of protected channels, where such stations can be heard
well into the US. But, like the Mexican stations, there is not much interest
in local Canadian affairs in the US.

The US AM band is so heavily overallocated already to meet the classical
cold war definition of jamming, with respect to being able to hear
stations
in Canada during nighttime hours (no Canadian station operates at 50 kW at
night that I am aware of).


From a list dated last month, I count 47 Canadian AMs with 50 kw at night.

there used to be more, but Canada has migrated many big and small AMs to FM,
and is slowly clearing the band except in the most major markets.


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Old August 30th 04, 08:50 PM
http://CBC.am/
 
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CBU (Vancouver, BC) is not 50 Kw at night.
Nor does CBU have an ancillary 1650-1700 Khz frequency at 50Kw.
Nor do most Canadian MW stations close to the border.

US stations have bombarded Canada with US material for the past 60 + years.

It is not a good reflection on the US to be bombarded (in Canada) by 3 to 5
US stations on top of each other, as soon as leave a major Canadian
metropolitan centre.

Canada should (if it does) adopt DRM for MW radio, at least for daytime
transmission.

The US AM band is so heavily overallocated already to meet the classical
cold war definition of jamming, with respect to being able to hear

stations
in Canada during nighttime hours (no Canadian station operates at 50 kW

at
night that I am aware of).


There are plenty of Canadian stations that run at 50kW. CKLW in Windsor,

for one.
CBU in Vancouver, as well as CBC stations in Regina and Winnepeg, too

(although
they've divested themselves of the 740 and 940 kHz operations in Toronto

and
Montreal). There are still quite a few Canadian Clears, although some of

those
channels, like 800kHz, are shared with Mexico, and thus run lower power or
directional patterns at night.












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