Posted by KEH on October 31, 2009 at 10:21:50 from (64.53.74.221):
In Reply to: Re: O/T Memory Test posted by Allan In NE on October 31, 2009 at 10:00:32:
Amaller AM stations reduce power at night to protect some stations with more power and protected frequencies. The FCC regulates all this.
At night the ionoshpere is no longer receiving as much radiation from the Sun. This affects propagation of radio waves. The radio waves will travel in a straight line and bounce back to earth when hitting a certain level of the ionosphere, then bounce up again from the earth, repeatedly. The area between bounces is called the "skip" and you may remember CBers referring to the skip coming in. FM radio does not skip, at least not very much consistently, since FM waves travel in a straight line. Out there in flat NE you are used to FM stations covering a wide area, to the extent of the earth's curvature, but in hilly areas the coverage area of FM stations is more limited.
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