"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.