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Radio: Difference between revisions
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→Wavelength calculation
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If you know what frequency you need to tune into, you can calculate the full wavelength and build an antenna to match. The wavelength calculation is shown in the inline image. | If you know what frequency you need to tune into, you can calculate the full wavelength and build an antenna to match. The wavelength calculation is shown in the inline image. | ||
Here, 'v' is called the phase speed (magnitude of the phase velocity) of the wave and 'f' is the wave's frequency<ref>https://en.wikipedia.org/wiki/Wavelength</ref>. In the context of radio, 'v' is the speed of light, or 3×10<sup>8</sup> m/s (specifically 299,792,458 m/s). For instance, if the desired emergency broadcast station was at | Here, 'v' is called the phase speed (magnitude of the phase velocity) of the wave and 'f' is the wave's frequency<ref>https://en.wikipedia.org/wiki/Wavelength</ref>. In the context of radio, 'v' is the speed of light, or 3×10<sup>8</sup> m/s (specifically 299,792,458 m/s). For instance, if the desired emergency broadcast station was at 12MHz, the full wavelength λ would be 24.98 meters (81.95 feet). From this calculation a fully functional 1/2 wavelength antenna of 12.5 meters (41 feet) could be built. | ||
== Receivers, transceivers and tuners == | == Receivers, transceivers and tuners == | ||