Adjacent Channel Power Ratio
Another common transmitter measurement is that of adjacent channel leakage power. This
is defined as the ratio of the amount of leakage power in an adjacent channel to the total
transmitted power in the main channel. This measurement can be used to replace the tradi-
tional two-tone intermodulation distortion (IMD) test for system non-linear behavior.
The result of an ACPR measurement can be expressed either as a power ratio or a power
density. In order to calculate the upper and lower adjacent channel values, the Cell Master
requires the specification of four parameters:
q
Main Channel Frequency
q
Measurement Channel Bandwidth
q
Adjacent Channel Bandwidth
q
Channel Spacing
Required Equipment
q
Cell Master MT8212B
q
Portable antenna for the selected signal frequency
Procedure
Step 1.
On the Cell Master, press the
MODE
key, use the Up/Down arrow key to select
the
Spectrum Analyzer
mode and press
ENTER
.
Step 2.
Press the
Signal Standard
soft key and the
Select Standard
soft key to select the
appropriate network standard, and press
ENTER
.
Step 3.
Press the
Select Channel
soft key, enter a value and press
ENTER
.
NOTE
: For ACPR measurements, when the appropriate Channel is selected,
the Main channel bandwidth, Adjacent channel bandwidth and channel spacing
are automatically set.
Step 4.
Press the
AMPLITUDE
key and select the
Ref Level
soft key to set the reference
level to an appropriate value.
Step 5.
Press the
Atten/Preamp
soft key and set the attenuation to
Auto
.
Step 6.
Press the
MEAS/DISP
key and select the
Bandwidth
soft key to set the resolu-
tion bandwidth and the video bandwidth to Auto.
Step 7.
Press the
Back
soft key to return to the previous menu.
Step 8.
Press the
Trace
soft key and the
Max Hold
soft key to set max hold to On as indi-
cated to the left of the graph.
Step 9.
Press the
Measure
soft key and press the
ACPR
soft key.
Step 10.
Make the measurement by pressing the
Measure
soft key. The detection method
is automatically changed to RMS Average. Solid vertical lines are drawn on the
display to indicate the main channel. Dashed vertical lines define the adjacent
channels. The Cell Master will display the measurement results.
5-13
Chapter 5 Spectrum Analyzer Measurements
Summary of Contents for Cell Master MT8212B
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Page 222: ...12 4 Chapter 12 GPS Feature Figure 12 3 Saved GPS Location Information...
Page 231: ...Chapter 13 CDMA Measurement 13 9 Figure 13 5 CDMA Display with Markers...
Page 255: ...Chapter 18 EVDO Mode 18 5...