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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02
Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend
Measuring the Downstream RF Signal
Figure 4-10 Measuring the RF Signal at the Upconverter Output—Output Adjusted to Correct
Range
Step 9
Select the video averaging feature on the spectrum analyzer. The signal becomes smoother and
frequency response problems might become visible. Your analyzer now displays an RF signal similar to
the one shown in Figure 4-11.
Figure 4-11 Measuring the RF Signal at the Upconverter Output Using Video Averaging
Note The approximate in-channel peak-to-valley flatness may be verified using the spectrum analyzer’s video
averaging feature. Be aware, however, that amplitude values registered while in the video averaging
mode are typically around 2.5 dB below the actual channel power.