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signals conforming to the IS-95 standard, the center frequency is set to 850MHz.
g)
Set the main channel bandwidth:
Press [Main Ch BW] and set the bandwidth of the main channel with the figure keys. For CDMA signals
conforming to the IS-95 standard, the channel bandwidth is set to 1.23 MHz.
h)
Set the adjacent channel bandwidth:
Press [Adj Ch BW] and set the required adjacent channel bandwidth with the figure keys. For CDMA
signals conforming to the IS-95 standard, the adjacent channel bandwidth is set to 1.23 MHz.
i)
Set the channel offset:
Press [Ch Space], set the desired channel offset with the numeric keys. For CDMA signals conforming to
the IS-95 standard, please input 1.23MHz.
j)
Turn on the adjacent channel power ratio test:
Press
【
Measure
】
, [ACPR>], [ACPR Off On] , and the measurement result is displayed at the bottom of
the screen, as shown in Figure 5-27.
The threshold test function can be used to facilitate the user to observe whether the adjacent channel
power exceeds the set range, and the operation steps of using the threshold test function are as follow:
a)
Threshold setting:
Press
【
Measure
】
, [ACPR>] , [Page Down] to enter the adjacent channel power ratio threshold test
setting menu;
Press [Upper Ch Threshold] and use the numeric keys to enter the upper adjacent channel threshold;
Press [Down Ch Threshold] and use the numeric keys to enter the lower adjacent channel threshold.
b)
Open the threshold test function:
Press [Threshold Test Off On] to open the threshold test function. If the adjacent channel power ratio
exceeds the set threshold, the screen will be marked with a red background.
Figure 5-27 Measurement of Adjacent Channel Power Ratio of CDMA signal
3
Measurement of GSM Adjacent Channel Power Ratio
Steps for measuring the adjacent channel power ratio of the GSM signal using the analysis adjacent
channel power ratio measurement function of S5105D/E/F microwave analyzer are as follows:
a)
Reset the microwave analyzer to its default state:
