Before Installation; Installation - Agilent Technologies 8712ET User Manual

NOTE
Characterizing and Verifying Antenna Systems
Typical Measurements
To reduce interference when performing return loss and fault location
measurements, reduce the system IF bandwidth by pressing
System Bandwidth
interference when performing fault location measurements, use the
bandpass mode.
1. To turn on the bandpass mode, press
Fault Location
2. To enter the center frequency, press
MHz
ENTER
3. To set the frequency span, press
Band Pass Max Span

Before Installation

Before installation, ensuring specified performance with incoming
inspection can save hours of needless disassembly and reassembly of the
cell site's antenna system. Important characteristics at this stage include
cable return loss, characteristic impedance, and velocity factor.

Installation

At installation, it is necessary to do a complete set of tests on the
antenna feedline system in order to fully characterize its initial
performance. During assembly, return loss is usually measured after the
addition of each component. Once assembly is complete, tests such as
insertion loss, feedline system return loss, fault location and length are
done. For characterization of the antenna, independent of the
contributions made by the feed system, an important parameter is
antenna return loss.
A significant property of an antenna is the propagation characteristics
that result in antenna patterns. Many of the measured properties of the
overall antenna system (which are determined at installation) are good
indicators of whether or not the antenna pattern has been altered.
Typically, this condition is confirmed from data collected by drive tests
that define the cell site "foot print."
7-8
Narrow 250 Hz
Band Pass .
.
FREQ
MHz
300
Option 100 Fault Location and SRL
. To further reduce
Cable
BEGIN
Center Frequency
Fault Loc Frequency
.
ENTER
AVG
900