- Joined Apr 3, 2015
Now let's consider the various forms of signal level measurements in CATV systems. In Figure 1.3 typical dBmV levels are shown at various points throughout distribution lines. These levels represent the TV video carrier peak signal. The peak of the video carrier is simply the unmodulated carrier voltage, as shown in Figure 2.3. The peak detection value in Figure 2.3 (c) is the only meaningful signal level measurement because it is the maximum of the carrier signal as if it were unmodulated. Each visual carrier at the subscriber's drop must be at a specified power minimum level and within a given number of dB from each other. (Chapter 4 deals with these specifications in detail).
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