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The distance over which the wave's shape repeats. It is usually determined by considering the distance between consecutive corresponding points of the same phase, such as crests, troughs, or zero crossings, and is a characteristic of both travelling waves and standing waves.
1) Radio spectrum resources available (for specific applications) in a specific geographical area and a specific time in which they operate other radio systems. 2) Unused radio spectrum which has either never been used, or is becoming free as a result of technical changes.
WSS