PDF Standards IEC 60244-2B Ed. 1.0 b:1969
Supplement B – Methods of measurement for radio transmitters – Part 2: Bandwidth, out-of-band power and power of non-essential oscillations – Modulating signals for the measurement of bandwidth and out-of-band power of transmitters for telephony and sound broadcasting
standard by International Electrotechnical Commission, 01/01/1969