Home » Propagation Propagation: (5 questions) Basic phenomena in HF, VHF, UHF propagation. Layers which refract signals. D layer absorption. Skip zones, hops, MUF, LUF, OWF. Solar cycle. Sky waves, ground waves. Sporadic E. Great circle paths, radiation angles. Fading. Doppler caused by satellite motion. Start 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50