User's Manual Part 3

05-4446A01, Rev. D Mercury Reference Manual 155

4.2 RADIO (RF) MEASUREMENTS

There are several measurements that should be performed during the ini-

tial installation. These measurements confirm proper operation of the

unit and, if they are recorded, serve as a benchmark in troubleshooting

should difficulties appear in the future. These measurements are:

• Transmitter Power Output

• Antenna System SWR (Standing-Wave Ratio)

• Antenna Direction Optimization

These procedures might interrupt traffic through an established network

and should only be performed by a skilled radio-technician in coopera-

tion with the Network Administrator.

4.2.1 Antenna System SWR and Transmitter Power

Output

Introduction

A proper impedance match between the transceiver and the antenna

system is important. It ensures the maximum signal transfer between the

radio and antenna. You can check the impedance match indirectly by

measuring the SWR (standing-wave ratio) of the antenna system. If the

results are normal, record them for comparison during future routine

preventive maintenance. Abnormal readings indicate possible trouble

with the antenna or the transmission line, and should be corrected.

Check the SWR of the antenna system before putting the radio into reg-

ular service. For accurate readings, a wattmeter suited to the frequency

of operation is required. One unit meeting this criteria is the Bird Model

™

directional wattmeter with the appropriate element installed.

The reflected power should be less than 10% of the forward power

(≈2:1 SWR). Higher readings indicate problems with the antenna, feed-

line or coaxial connectors.

Record the current transmitter power output level, then set it to an ade-

quate signal level for the directional wattmeter (for the duration of the

test.)

System Bootup (power on) INFORM Self explanatory

Telnet Access Locked for

5 Min

MAJOR Self explanatory

Telnet User Logged

Out/Logged In

MAJOR Self explanatory

User Selected Reboot MAJOR Self explanatory

Table 4-7. Non-Critical Events—Alphabetical Order (Continued)

Event Log Entry Severity Description