User Manual

AS4000 Operations and Maintenance
Section
605-0000-431
6
. Issue 1.6. Date3/2/99
DLP-020
Page 47 of 60 © Copyright Airspan Communications Corporation 1999
Top
Left
Right
CRU
C
R
U
Area clear from clutter, obstruction or shrouding
15
o
15
o
o
30
Horizontal Plane
o
30
Vertical Plane
Area clear from
clutter, obstruction
or shrouding
Figure 1-6. CRU Positioning
2. If it is not possible to get sufficient RX gain the CRU, and there are no obstructions,
it may be faulty and should be changed.
Power Control Measurements
1. Using the DMM, measure the DC voltage between Ground (Green) and the PC
Monitoring point (Black) on the breakout socket. The voltage measured is a relative
indication of the transmit power level: The lower the voltage the higher the output
power level.
2. Check the label on the CRU to get an indication of the transmit signal strength from
the characterised readings to ensure that the margins are consistent with the receive
fade margins and original test results.
+21
+15
+11
TRANSMIT SIGNAL
STRENGTH /dBm
PC DIGITAL
VOLTMETER
READING
Table 5. Label Detail: Transmit Power Control (2.0 - 2.3GHz Band)