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Medium Frequency (300 kHz - 3 MHz): 

The only amateur medium-frequency band is situated just above the domestic AM broadcast band. Ground wave provides reliable communication out to 150 km or during the day, when no other form of propagation is available. Long-distance paths are made at night via F2 layer.

1.8-20 MHz (160m)

The Top band, as it is sometimes called, suffers from extreme daytime D-layer absorption, Even at high radiation angles, virtually no signal can pass through to the F layer, so daytime communication is limited to ground-wave coverage. At night, the D layer quickly disappears and worldwide 160m communication becomes possible via F2 layer skip. Atmospheric and man-made noise limit propagation. Tropical and midaltitude thunderstorms cause high levels of static in summer, making winter evenings the best time to work DX at 1.8 MHz. A proper choice of reeiving antenna can often significantly reduce the amount of received noise while enhancing desired signals.

Acknowledgment:

The contents of this Page (Ham Radio), may derived (in part or all) from many sources, including (but not limited to): The 2000 ARRL Handbook For Radio, QST Magazines, QRZ.Com, QSL.Net and many other reference sites.

If for any reason the contents violate rules or regulation, please E-mail me.