This part of IEC 61305 applies to household high-fidelity radio tuner units with facilities for reception of frequency modulation sound broadcasts with a rated maximum system deviation of ±75 kHz, using the pilot-tone system for stereophonic broadcasting (see ITU-R BS.450-2). It may be applied to systems using a rated maximum system deviation of ±50 kHz by decreasing all the stated deviations in proportion. It also applies, except where stated, to equipment having multiple functions, including these facilities. It is intended to be read in conjunction with part 1 of this standard.