howto:hambasics:sections:polarization
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howto:hambasics:polarization [2019/12/12 18:55] – [How To Make A Radio Wave] va7fi | howto:hambasics:sections:polarization [2020/11/08 16:00] – va7fi | ||
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====== How To Make A Radio Wave ====== | ====== How To Make A Radio Wave ====== | ||
- | Back on the [[intro#hz |Intro Page]], we introduced to the idea of frequency and saw that | + | Back on the [[intro# |
<WRAP indent prewrap 80%> | <WRAP indent prewrap 80%> | ||
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<WRAP centeralign> | <WRAP centeralign> | ||
- | {{dipole.gif}}{{radiationpatternh.jpg}} | + | {{dipole.gif?400}}{{radiationpatternh.jpg}} |
</ | </ | ||
Voila! The antenna we've made is called a // | Voila! The antenna we've made is called a // | ||
+ | {{ youtube> | ||
====== Horizontal vs Vertical Polarization ====== | ====== Horizontal vs Vertical Polarization ====== | ||
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====== Wavelength and Antenna Length ====== | ====== Wavelength and Antenna Length ====== | ||
- | As we saw previously, the wavelength (λ) in metres of the wave is dictated by the frequency | + | As we saw previously, the wavelength (λ) in metres of the wave is dictated by the frequency |
- | < | + | < |
- | < | + | \$$ \lambda = \frac{300}{f} \qquad \text{or} \qquad f = \frac{300}{\lambda}\$$ |
</ | </ | ||
- | This explains the Band name in the table on the [[intro# | + | This explains the Band name in the table on the [[intro# |
Now it turns out that the size of the antenna is very closely related to the wavelength of the signal we wish to transmit or receive. | Now it turns out that the size of the antenna is very closely related to the wavelength of the signal we wish to transmit or receive. | ||
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====== Questions ====== | ====== Questions ====== | ||
- | [[sections | + | [[empos |{{/ |
howto/hambasics/sections/polarization.txt · Last modified: 2020/11/08 16:10 by va7fi