Specifications

Chapter 9 75
Measuring Digital Communications Signals
Making Adjacent Channel Power (ACP) Measurements
Measuring Digital Communications
Signals
Figure 9-6 ACP Measurement on a Base Station W-CDMA Signal
The frequency offsets, channel integration bandwidths, and span
settings can all be modified from the default settings selected by the
radio standard.
Two vertical white lines indicate the bandwidth limits of the central
channel being measured.
Offsets A and B are designated by the adjacent pairs of red and yellow
lines, in this case: 5 MHz and 10 MHz from the center frequency
respectively.
Step 5. Select the combined spectrum and bar graph view of the results:
(ESA) Press
View/Trace, Combined.
(PSA) Press
Trace/View, Combined.
Step 6. View the results using the full screen:
Press
Display, Full Screen.
NOTE Press the Return key to exit the full screen display without changing
any parameter values.
Step 7. Define a new third pair of offset frequencies:
Press
Meas Setup, Offset/Limits, Offset (C), Offset Freq (On), 15, MHz.
This third pair of offset frequencies is offset by 15.0 MHz from the
center frequency (the outside offset pair) as shown in Figure 9-7. Three
further pairs of offset frequencies (D, E and F) are also available.