Cisco BWX 8305 Installation And Commissioning Manual page 57

Chapter 6 Installation
6.3.10.4 Procedure to Establish a TX Path Reference Level
For this procedure, you must first establish a reference level. Follow these steps to do so.
Set up the equipment, as shown in
Step 1
Spectrum Analyzer span, bandwidth resolution, video bandwidth, sweep, and frequency.
Step 2 Connect the Signal Generator to the Spectrum Analyzer using 3 segments of N-type terminated test cable
and 2 F-F barrel connectors.
Step 3 Turn on the RF signal.
Adjust the Signal Generator signal until the value in the Spectrum Analyzer is approximately –20dbm.
Step 4
Step 5 Make sure the Test Box is not connected to power.
6.3.10.5 Equipment Setup to Measure TX Path Gain or Loss
Follow the setup instructions provided in
transmit path gain or loss.
Figure 6-21
Set Test Box to
SG
Warning Any time you reconnect the cable, going form the JP-1 QMA connector, located on the topof the RFD
Test Box, to one of the RF ports in the ANtenna, make sure to disconnect the RFS Test Box from its
power source. Failing to this may cause rapid degradation of the QMA connector in the RFS Test Box,
due to DC voltage arc between the center conductor and the outer shield of the QMA connector.
OL-16336-02
Setup to Measure TX Path Gain or Loss
TX RFS
The loss
introduced by
the Test Box
at different
frequencies
can be read
on this label
on the side
Insert the Test Box and the RFS
Connect the
JP-1 (test box top) to one of the RF ports
in the RFS, and the RFS Cal Port to the
Switch the Test Box to TX 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 =
Figure 6-20, for Signal Generator amplitude and frequency, and for
Figure 6-21 to measure the BWX 8305 Basestation Antenna
RF
SG to JP-2 (test box side),
SA Reading
+20 dB (i.e. – Reference Level)
+ Test Box loss
BWX 2305 Basestation Installation and Commissioning Guide
BWX 8305 Basestation Antenna Installation
CAL
SA
SA
6-21