Radio Measurements; Antenna System Swr And Transmitter Power Output - Microwave Data Systems MDS entraNET 900 System Manual

96 MDS entraNET 900 System Guide (Preliminary)
Table 4-7. Non-Critical Events (Alphabetical Order) (Continued)
Event Log Entry
Reprogramming Complete
Reprogramming Failed
Reprogramming Started
Scanning Started
SNR Within threshold/Below
threshold
System Bootup (power on)
Telnet Access Locked for
5 Min
Telnet User Logged
Out/Logged In
User Selected Reboot

4.2 RADIO MEASUREMENTS

There are several measurements that are a good practice to perform
during the initial installation. The will 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 may interrupt traffic through an established network
and should only be performed by a skilled radio-technician in coopera-
tion with the network manager.
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. The impedance match can be checked indirectly by
measuring the SWR (standing-wave ratio) of the antenna system. If the
results are normal, record them for comparison for use during future
routine preventative maintenance. Abnormal readings indicate a pos-
sible trouble with the antenna or the transmission line that will need to
be corrected.
The SWR of the antenna system should be checked before the radio is
put into regular service. For accurate readings, a wattmeter suited to
1000 MHz measurements is required. One unit meeting this criteria is
the Bird Model 43 ™ directional wattmeter with a 5J element installed.
Severity SNMP Trap
INFORM reprogComplete(46)
MAJOR reprogFailed(47)
INFORM reprogStarted(45)
INFORM startScan(34)
INFORM snr(41)
INFORM systemBoot(32)
MAJOR telnetLockdown(64)
MAJOR telnetLogin(48)
MAJOR systemReboot(33)
MDS 05-4055A01, Rev. A