{
  "url": "https://openlegislation.uk/wireless-telegraphy-control-of-interference-from-ignition-apparatus-regulations-1952/schedule/paragraph-1",
  "json_url": "https://openlegislation.uk/wireless-telegraphy-control-of-interference-from-ignition-apparatus-regulations-1952/schedule/paragraph-1.json",
  "legislation": "uksi/1952/2023",
  "legislation_title": "The Wireless Telegraphy (Control of Interference from Ignition Apparatus) Regulations 1952",
  "legislation_url": "https://openlegislation.uk/wireless-telegraphy-control-of-interference-from-ignition-apparatus-regulations-1952",
  "path": "schedule/paragraph/1",
  "kind": "paragraph",
  "number": "1",
  "heading": "Definitions of expressions used in this Schedule",
  "text": "Voltage and e.m.f.\nReferences to the voltage or e.m.f. of a sinewave are references to its effective or root mean square value.\nDecibel\nThe term “decibel” (abbreviated db) expresses the logarithmic ratio of two voltages or e.m.f.'s. The ratio of two voltages V1 and V2 expressed in decibels is 20 times the logarithm to the base 10 of V1/V2 i.e. 20 log10 V1/V2.\nApplied Voltage\nThe voltage applied to the input terminals of the measuring apparatus.\nReference deflection\nThe deflection of the needle of the indicating meter of the valve-voltmeter to a mark at the middle of the scale of the meter.\nTuned frequency\nThe mid-frequency of the band of frequencies for which the measuring apparatus is tuned to accept the applied voltage.\nIntermediate frequency\nThe mid-frequency of the band of frequencies for which the intermediate frequency amplifier of the measuring apparatus is tuned to accept the voltage applied to it.\nImage frequency\nThe frequency, not being the tuned frequency, which combines with the fundamental frequency of the beating oscillator to produce the intermediate frequency.\nField-strength calibration constant\nThe number of decibels that must be added to the reading of the measuring apparatus, when a measurement of field-strength is made as prescribed, to give the value of field-strength in decibels above one microvolt per metre.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1952/2023/schedule/paragraph/1",
    "retrieved_at": "2026-10-30T01:54:43.854806+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}