1.3 The tests described in item 3 of Table 3 26 1 Shape of the spectrum envelope for class B8E and class R7J emissions modulated with white noise This section deals with the results of measurements made by several administrations on transmitters of different design for classes of emission B8E and R7J. The major characteristics of the transmitters and the test condition relating to the measurements are summarized in Table 3. TABLE 3 Transmitter characteristics and measurement test conditions for B8E and R7J emissions Item No. 1 2 3 of emission B8E B8E B8E; R7J Various transmitters Various transmitters Transmitter characteristics: peak envelope power 20 Several kW up to some Different values Pp – (two tones)(1) (kW) tens of kW order intermodulation – –35 distortion (dB) 3(1) number of channels active 2, in lower sideband 2 and 4 – during the measurement bandwidth of speech 3 000 – channel (Hz) carrier suppression (dB) relative – –50 to peak envelope power White noise White noise White noise Type of modulating signal: bandwidth 30 Hz-20 kHz 100 Hz-6 kHz – 1 dB per sideband Class of emission B8E B8E B8E; R7J adjusted to a signal level(1) value such that: at the output, 0.25 (two 0.25 (two Pm  Pp Pp – True r.m.s. selective Spectrum analyser Spectrum analyser Type of measuring device: measurement device passband (Hz) Curves C: 3 800 0.05 – F(2) D: 100 Shape of spectrum See Fig. 10 See § 1.1
1.3 The tests described in item 3 of Table 3 26 1 Shape of the spectrum envelope for class B8E and class R7J emissions modulated with white noise This section deals with the results of measurements made by several administrations on transmitters of different design for classes of emission B8E and R7J. The major characteristics of the transmitters and the test condition relating to the measurements are summarized in Table 3. TABLE 3 Transmitter characteristics and measurement test conditions for B8E and R7J emissions Item No. 1 2 3 of emission B8E B8E B8E; R7J Transmitter characteristics: Various transmitters Various transmitters – peak envelope power Pp (two tones)(1) (kW) 20 Several kW up to some tens of kW Different values – order intermodulation distortion 3(1) (dB) –35 – number of channels active during the measurement 2, in lower sideband 2 and 4 – bandwidth of speech channel (Hz) 3 000 – carrier suppression (dB) relative to peak envelope power –50 Type of modulating signal: White noise White noise White noise – bandwidth 30 Hz-20 kHz 1 dB 100 Hz-6 kHz per sideband Class of emission B8E B8E B8E; R7J signal level(1) adjusted to a value such that: – at the output, Pm  0.25 Pp (two 0.25 Pp (two Type of measuring device: True r.m.s. selective measurement device Spectrum analyser Spectrum analyser – passband (Hz) Curves C: 3 800 D: 100 0.05 F(2) Shape of spectrum See Fig. 10 See § 1.1
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