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On VHF and above, 1/4 wavelength coaxial cavities are used to give protection from high-level signals. For a frequency of approximately 50 MHz, the diameter of such a device would be about 10 cm (4 in). What would be its approximate length?
1.5 metres (5 ft)
A quarter wavelength at 50 MHz in free space is (300/50)/4 = 1.5 meters. Coaxial cavities will be physically close to this electrical length, considering velocity factor if filled with dielectric.
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