[BC] AM Protection

[Dan Strassberg]

Henry Turner wrote:

Hello all,

I have the following question.

Does one have to protect non class A international stations pursuant to
domestic interference rules?
If not, what if any protections apply to international non class A at night?

Thanks
Henry
----

As I understand it, a foreign (i.e. Western hemisphere) non-Class A station
must be protected within its national borders from co-channel and
first-adjacent-channel nighttime 10% skywave interference from stations in
other Westen hemisphere nations to the greater of A) the foreign station's
50%-exclusion NIF contour or B) its 2 mV/m groundwave contour. The foreign
station's groundwave service must be protected within the station's national
borders from groundwave interference from stations located in other Western
hemisphere nations to the station's 0.5 mV/m contour. That is, at the
station's 0.5 mV/m daytime groundwave contour within its national borders,
groundwave interference from stations in other Western hemisphere nations
must not exceed 25 microvolts/m co-channel, 250 microvolts/m
first-adjacent-channel-channel, and 5000 microvolts/m second-adjacent
channel. I am unaware of any critical-hours protection requirements for
non-Class A statopns.

--
Dan Strassberg, dan.strassberg at att.net
eFax 707-215-6367