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Different frequencies are used at different times of the day. Wouldn’t it be easier to use the same frequency all day like my local AM station?

April 26, 2017different easier frequencies Frequency local station times Used

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Different frequencies are used at different times of the day. Wouldn’t it be easier to use the same frequency all day like my local AM station?

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Propagation conditions for ionospheric reflection can vary from season to season; the time of day; and, solar activity. If a broadcaster were to use a single frequency, it would only be possible to propagate a signal during a limited time of the day and over a limited area. The optimal choice of frequencies depends on the factors mentioned above, as well as the site of the transmitter and the area to be covered.