Wavetek STABILOCK 4031 - Adjacent-Channel Power Measurement ACPM

Adjacent-Channel Power Measurement ACPM
WHY?

Adjacent-channel power is that part of mobile-station
power which is emitted as noise in each of the two
adjacent channels. To avoid adjacent-channel inter-
ference, the noise must not exceed a defined value.
Requirement

Make the general test preparations.
HOW?

Press
{ACPM}
in the burst display mask.

Enter the number of the channel on which the mobile
station currently sends (Fig. 10.24). Entry of a frequency
value is not possible.
Channel-number calculation
824.010 ≤
≤ ≤
≤ f ≤
≤ ≤
≤ 825.000 N =
f – 825.000
0.03
+ 1023
825.030 ≤
≤ ≤
≤ f ≤
≤ ≤
≤ 848.970 N =
f – 825.000
0.03

Start the test with
{RUN}
. The display shows the test
results.

End the test with
{STOP}
.
{RETURN}
takes you back to the
burst display mask.
Test Results
A
+
D
Display shows adjacent-channel power related to reference
level measured in channel on which base station currently
sends. Values must not exceed specified values.
RESULt6 –1 Relative power in lower adjacent channel
RESULt7 xxxx Reference level in current transmitter channel
RESULt8 +1 Relative power in upper adjacent channel
Entry field for current
channel number
Fig. 10.24: IS-136-ACPM test mask.
IS-136 MS Adjacent-Channel Power Measurement ACPM
10-40