Chapter I.
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Chap. I, art. 1 RR)(55–59) 55 *Experimental Station:* A station utilizing Hertzian waves in experiments with a view to the development of science or technique. This definition does not include amateur stations. 56 *Amateur Station:* A station in the amateur service. Section IV. Technical Characteristics 57 *Frequency Assigned to a Station:* The frequency coinciding with the centre of the frequency band in which the station is authorized to work. This frequency does not necessarily correspond to any frequency in an emission. 58 *Bandwidth Occupied by an Emission:* The band of frequencies comprising 99% of the total radiated power extended to include any discrete frequency on which the power is at least 0.25% of the total radiated power. 59 *Frequency Tolerance:* The frequency tolerance, expressed as a percentage or in cycles per second, is the maximum permissible deviation, with respect to the reference frequency1)59.1 1) The concept of a reference frequency becomes necessary to include the many classes of emission now coming into use, including single sideband and multiple working.
This is merely a frequency which is selected in any convenient way. The actual emission includes frequencies which are characteristic of the physical emission (for example, the carrier frequency itself, or a particular frequency in a sideband) as distinguished from the assigned frequency and the reference frequency, which may be regarded as mere numbers. It is intended that, consistent with the physical qualities of the apparatus, one of these characteristic frequencies shall always coincide with the reference frequency.
This characteristic frequency may then be referred to as the one which corresponds to the reference frequency. It is the maximum permissible difference between these two frequencies, namely the reference frequency, which is a mere number, and the corresponding characteristic frequency, which represents a physical attribute of the emission, that is meant by frequency tolerance., of the corresponding characteristic frequency of an emission; the reference frequency may differ from the frequency assigned to a station by a fixed and specified amount. 63 Stat. 1592 (60–65)(
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