Cisco BWX 8305 Installation And Commissioning Manual page 59

Chapter 6 Installation
6.3.10.8 Equipment Setup to Measure the RX Path Gain or Loss
To establish a reference level for the receive path gain or loss, you will connect the Signal Generator to
the Spectrum Analyzer using 3 segments of N-type terminated test cable and 2 F-F barrel connectors
(Figure
amplitude to –20 dBm.
Figure 6-22
Set Test Box to Set Test Box to
6.3.10.9 Procedure to Measure the RX Path Gain or Loss
Note Be sure to power down the Test Box each time you change cables to sweep. Failure to do so may
damage the Test Box.
Insert the BWX 8305 Basestation Antenna (RFS) and the Test Box.
Step 1
Step 2 Using
port, and one of the RF ports on the BWX 8305 Basestation Antenna to JP-1 on the top of the Test Box.
Connect JP-2 on the side of the Test Box to the Spectrum Analyzer.
Power up the Test Box.
Step 3
Step 4 Measure the gain or loss introduced by this path through the BWX 8305 Basestation Antenna. Repeat
the procedure for the other path. Check the SA value to the printed values that accompanied the Antenna.
If there is a large discrepancy, check the connections and repeat the sweep.
Subtract the loss at the Test Box.
Step 5
Repeat Steps 4 and 5, connecting the cable from JP-1 to the other RF port.
Step 6
OL-16336-02
6-22). Later, you will have to subtract the loss introduced by the Test Box. Set the signal
Setup to Establish RX Path Reference Level
RX RX RFS RFS
The loss
introduced by
the Test Box
at different
frequencies
can be read
on this label
on the side
SA
Figure 6-22 as a guide, connect the Signal Generator to the BWX 8305 Basestation Antenna Cal
BWX 8305 Basestation Antenna Installation
RF
CAL
Insert the Test Box and the RFS
Connect the SG to the Cal Port of the RFS,
one of the RF ports in the RFS to JP-1 (test box top), JP-2
(test box side) to the SA
Switch the Test Box to RX and RFS
Power Up the test box (+24 VDC)
Measure gain introduced by this path through
the RFS (repeat for each RF port)
RFS Insertion Gain = SA Reading
+20 dB (i.e. – Reference Level)
+ Test Box loss
BWX 2305 Basestation Installation and Commissioning Guide
SG
6-23