Radio (Rf) Measurements; Antenna System Swr And Transmitter Power Output - GE MDS Mercury Series Reference Manual
Wireless ip/ethernet transceiver, covering ap and remote units
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- Setup manual (4 pages) ,
- Setup manual (4 pages) ,
- Reference manual (76 pages)
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05-4446A01, Rev. C
Table 4-7. Non-Critical Events—Alphabetical Order (Continued)
Event Log Entry
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 (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
43
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.
Mercury Reference Manual
Severity
Description
INFORM
Self explanatory
INFORM
Self explanatory
MAJOR
Self explanatory
MAJOR
Self explanatory
MAJOR
Self explanatory
143
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