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HFTA-ARRL-Space
Tried to make the subject grab a bit.
I just fininshed the ARRL Antenna Book Chapter on Effects of Ground. There are HFTA graphs showing elevation response for various antenna configurations (mostly Yagis). Most arrays show good response up to 12 degrees above the horizon, then many show a null and then, a second peak around 25 to 30 degrees above the horizon. Here's my question: At 25 to 30 degrees elevation response, aren't these waves leaving the ionosphere (i.e., refracted instead of reflected)? Am I right to consider this component of propagation to have left the earth? This would indicate a substantial fraction of each amateur transmission is sent into space. I always thought Broadcast transmissions were most likely to emanate from Earth. Are hams more or less likely to transmit into space than Broadcast? John (who wishes to remain a student and never an expert) |
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