# The Wireless Telegraphy (Control of Interference from Ignition Apparatus) Regulations 1952, Paragraph 5: Input circuit


The impedance at the input terminals of the measuring apparatus shall be balanced and shall have a value of 75 ± 15 ohms and a phase angle within the limits ± 20° at any frequency within the range of the apparatus.

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Source: https://www.legislation.gov.uk/uksi/1952/2023/schedule/paragraph/5 (the official version)
Page: https://openlegislation.uk/wireless-telegraphy-control-of-interference-from-ignition-apparatus-regulations-1952/schedule/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.