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hambasics:sections:propagation [2021/01/03 08:06] – created - external edit 127.0.0.1hambasics:sections:propagation [2026/07/10 11:11] (current) – [Frequency] va7fi
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 ====== Propagation ====== ====== Propagation ======
 Radio wave propagation describes the way in which radio waves travel from one point to another.  As we saw in the previous page, radio waves (like light waves) have polarization and are affected by the phenomena of reflection, refraction, diffraction, and scattering.  As we'll see next, these give rise to different ways that the signal can propagate through the atmosphere.  Radio wave propagation describes the way in which radio waves travel from one point to another.  As we saw in the previous page, radio waves (like light waves) have polarization and are affected by the phenomena of reflection, refraction, diffraction, and scattering.  As we'll see next, these give rise to different ways that the signal can propagate through the atmosphere. 
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-{{ youtube>aPp4X-l0EYU }} 
  
 ====== Direct Waves (Line Of Sight) ====== ====== Direct Waves (Line Of Sight) ======
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 So normally, higher frequencies are better during the day (up to about 6m), and lower frequencies are better at night. So normally, higher frequencies are better during the day (up to about 6m), and lower frequencies are better at night.
  
-Here's a map of [[http://www.spacew.com/www/fof2.html |MUF]] that's updated regularly.  You can think of this as a "weather map" for ham radio. 
  
  
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 Here's the animation if you want to move the dials and experiment with it yourself. Here's the animation if you want to move the dials and experiment with it yourself.
  
-{{ggb>/howto/hambasics/sections/earthpropagation.ggb 800,450}}+{{ggb>/hambasics/sections/earthpropagation.ggb 800,450}}
 ===== 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).  This mode can be used on VHF frequencies between 30 MHz and 100 MHz but is most effective on the 6m band (50 MHz). 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).  This mode can be used on VHF frequencies between 30 MHz and 100 MHz but is most effective on the 6m band (50 MHz).
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