
Measurements (rf) 169
subtract.) Note that at the 10 ms sweep used in Figure 5.22(b) the sidebands
are not completely resolved. For Figure 5.22(c), the 100 ms sweep was
selected, the 50 kHz sidebands being resolved right down to the 60 dB
level.
Figure 5.23(a) shows the spectrum monitor operating on Band C -
covering bands IV and V The span is just over 1 MHz/div and shows a
Band IV TV signal showing (left to right) the vision carrier, the colour sub-
carrier, the sound carrier and immediately adjacent to it, the much broader
band occupied by the NICAM sound channel.
Figure
5.22 (a) Oscilloscope display of the 100 MHz output at maximum level ...