>
>> At night, it was switched to the center tap to get 250 W output
>
> Better propagation at night ?
>

Yes, there's better propagation at night. During the day, medium wave RF
does not reflect off the ionosphere. At night, it does. While better
propagation may be good, the real reason stations decrease power at night,
or go to a directional antenna, or stop transmitting at all (daytime only
stations) is to protect other stations. Because of only groundwave
propagation during the day, it was possible to fit in more stations during
the day. Various techniques are used to protect the existing stations at
night (as outlined above).

Harold




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