IEC 61305-2:1997 pdf download – Household high-fidelity audio equipmentand systems – Methods of measuring and specifying the performance – Part 2: FM radio tuners

IEC 61305-2:1997 pdf download – Household high-fidelity audio equipmentand systems – Methods of measuring and specifying the performance – Part 2: FM radio tuners.
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 p4lot-tone system br stereophonic broadcasting (see ITU-R BS450-2). 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 slated, to equipment having multiple functions, including these facilities. It is intended to be read in conjunction with part I of this standard.
1.2 Normative references
The following normative documents contain provisions which, through relerence In this text, constitute provisions of this part of IEC 61305. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61305 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
lEG 60315-1:1988, Methods of measurement on rad,o receivers for various classes of emission
— Part 1: General considerations and methods of measurement, including audio-frequency measurements
lEG 60315-4:—, Methods of measurement on radio receivers for various classes of emission — Part 4: Receivers for frequency-modulated sound broadcasting emissions I)
ITU-R OS.412-7:l 995. Planning standards for FM Sound broadcasting at VHF
ITU-R BS.450-2:l 995, Transmission standa,’ds for FM sound broadcasting at VHF
ITU-R BS.64 1:1966. Determination of radio-frequency protection ratios for frequency modulated sound broadcasting
ITU-R BS.704 :1990, Characteristics of FM Sound broadcasting reference receivers for planning purposes
For equipment intended for use In ITU Region 1. XIs 300 kHz (three 100 kHz channels from the wanted channel) and Yis 40 kHz. For equipment intended for use in ITU Regions 2 and 3. Xis 400 kHz (two 200 kHz channels from the wanted channel) and Yis 75kHz.
NOTE – Th. ITU regions are de$med in tire IUJ Rd.o Rqgu1ehn5. Region I includes Europe, Africa and areas bordering tie Mediterranean Sea, Region 2 includes lii, Americas and Region 3 Includes Asia and Australasis. However. broadcashng administrations in some Countries may adopt systems wlwcb are not those generally used in that region.
After tuning the equipment and noting the a.f, output voltage, the modulation shall be removed and the signal level set to 30 d8 (1W). The lrequency difference between the wanted and unwanted signals shall be X kHz (see above) and the unwanted signal shall be modulated at I kHz with ±Y kHz (see above) deviation, The level of the unwanted signal is then adjusted until the a.f. output level is 20 dB below thai first measured.
NOTE — Attention is drawn to ITU.R 65412-7. 65450-2. 65 6-41 and 65704. ScceDted unanirirously by the member adminlslratlons. Although me measurement conditions specified in tileS standard vary went ITU regions. Recommendations BS.412-7 and 8S704 strongly imply that Ihe receiving eQuipment should have the same selectivity characteristics wherever it is intended to be used.