# The Wireless Telegraphy Apparatus (Low Power Devices) (Exemption) Regulations 1989, Paragraph 4: Narrow band radio microphones


Any wireless telegraphy apparatus incorporating a microphone which is –
(a) designed or adapted for transmission on a bandwidth not exceeding 25 kHz; and
(b) constructed so as to be capable of use only –
(i) at an ERP not exceeding 5 mW; and
(ii) on one or more of the frequencies listed below –
174.600 MHz 174.885 MHz
174.675 " 175.020 ".
174.770 "

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Source: https://www.legislation.gov.uk/uksi/1989/604/schedule/paragraph/4 (the official version)
Page: https://openlegislation.uk/wireless-telegraphy-apparatus-low-power-devices-exemption-regulations-1989/schedule/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.