howto:hambasics:sections:propagation
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howto:hambasics:propagation [2020/03/14 16:39] – [Questions] va7fi | howto:hambasics:sections:propagation [2020/11/12 16:49] – [Animation] va7fi | ||
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====== Propagation ====== | ====== Propagation ====== | ||
Radio wave propagation describes the way in which radio waves travel from one point to another. | Radio wave propagation describes the way in which radio waves travel from one point to another. | ||
{{ youtube> | {{ youtube> | ||
+ | |||
====== Direct Waves (Line Of Sight) ====== | ====== Direct Waves (Line Of Sight) ====== | ||
{{ lineofsight.png? | {{ lineofsight.png? | ||
- | VHF radio waves (above 50 MHz) travel more or less in a straight line, and so cannot go much beyond the horizon. | + | VHF radio waves (above 50 MHz) travel more or less in a straight line, and so cannot go much beyond the horizon. |
For example, VA7FI' | For example, VA7FI' | ||
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+ | ===== Animation ===== | ||
+ | Here's the animation if you want to experiment with it yourself. | ||
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+ | {{ggb> | ||
===== Meteor Scattering ===== | ===== Meteor Scattering ===== | ||
When meteors enter the ionosphere, they create intensely ionized columns of air that can scatter radio waves for very short periods of time (from a fraction of a second to a couple seconds per event). | When meteors enter the ionosphere, they create intensely ionized columns of air that can scatter radio waves for very short periods of time (from a fraction of a second to a couple seconds per event). | ||
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===== References ===== | ===== References ===== | ||
* [[https:// | * [[https:// | ||
+ | * [[http:// | ||
====== Questions ====== | ====== Questions ====== |
howto/hambasics/sections/propagation.txt · Last modified: 2021/01/03 08:06 by va7fi