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Microwave Networks
CM 100Base-T System User’s Manual
7/23/03
Page 6-5
Transmitter Output Power
— Adjust transmitter output power after initial installation
and again whenever a TXU is replaced.
Note: Adjust transmitter output power with the TXU online and APC Manual off.
To adjust transmitter output power:
1.
Set the TXU online (screen 071) and set APC to OFF (screen 87.) On non-protected
systems, set the RF LPBK switch on the adjacent RXU on to force the TXU off-line.
2.
Attach a power meter to the Online Mon connector on the TX filter in the RF distribu-
tion section.
3.
Note the specified radio Tx (APC Low) output power (refer to Chapter 1, Specifica-
tions) and subtract from that the value written near the online MON port. Note the re-
sult.
4.
Adjust the Tx output power using the potentiometer on the A TXU labeled TX PWR
ADJ, until the measured power matches the result of Step 3.
5.
Repeat steps 2, 3 and 4 for the standby radio TXU, after switching Tx B on-line.
For example, with Tx output power of +18 dBm switch the A radio on-line. If the label
near the on-line MON port is 24.5 dB, subtract that from 18 dBm. The result is -6.5 dBm.
Adjust the TX PWR ADJ until you measure -6.5 dBm at the on-line MON port. Now put
the standby TXU on-line and repeat the procedure.
Transmitter Modulation Characteristics
— The modulation characteristics of a digital
microwave transmitter are determined by the digital signal bit rate, transmitter output
power level, and transmitter filtering.
The filters are factory tuned and fixed; they require no further checks.
If desired, you may perform the system checks in Chapter 5 in addition to the annual
transmitter checks.
DC Voltage Tests
Insert fuses while monitoring primary (line) voltage. If fuses blow, check for reversed
battery connections, incorrect fuse value, faulty power supply unit or power harness
cable/connections. Table 6-C lists which fuses to use, depending on whether you are
using a
±
24 V or
±
48 V battery.
Check primary and secondary voltages at the test points on the front of the RF PSU and
SP PSU. Record the values in the configuration table of Chapter 5. The module fail LED
on the PSU must be off, indicating normal operation. Replace the radio covers and allow
an hour for the radio to warm up.
Table 6-C. Fuse Ratings
Battery
RF PSU Fuse
SP PSU Fuse
±
24 V
10A
5A
±
48 V
5A
3A
Summary of Contents for CM7
Page 2: ......
Page 4: ...Page iv 5 04 05 CM7 8 100Base T System User s Manual ...
Page 16: ...Glossary Page xvi CM System Users Manual X Y Z ...
Page 24: ...Microwave Networks CM7 8 100Base T System User s Manual Pagexxiv ...
Page 62: ...Chapter 2 Operation Page 2 18 5 02 05 CM 100Base T System User s Manual ...
Page 64: ...Chapter 3 Module Descriptions Page 3 2 CM7 8 100Base T ...
Page 88: ...Section 3 3 Transmitter Unit Page 3 3 6 CM7 8 System User s Manual ...
Page 96: ...Section 3 5 RF Power Supply Unit Page 3 5 4 CM System User s Manual ...
Page 100: ...Section 3 6 SP Power Supply Unit Page 3 6 4 CM System User s Manual ...
Page 106: ...Section 3 7 Alarm and Control Unit Page 3 7 6 11 18 03 CM 100Base T System User s Manual ...
Page 124: ...Section 3 11 SYNDES Page 3 11 6 CM System User s Manual ...
Page 130: ...Section 3 12 SCU Page 3 12 6 11 18 03 CM 100Base T System User s Manual ...
Page 138: ...Section 3 13 OWU Page 3 13 8 CM System User s Manual ...
Page 150: ...Section 3 15 NMU Page 3 15 6 CM System User s Manual ...
Page 192: ...Chapter 5 Verification Page 5 20 CM System User s Manual ...
Page 194: ...Chapter 6 Maintenance Page 6 2 7 23 03 CM 100Base T System User s Manual ...
Page 224: ...Chapter 6 Maintenance Page 6 32 7 23 03 CM 100Base T System User s Manual ...
Page 226: ...Site Engineering Page 2 CM System User s Manual ...
Page 230: ...Appendix A T I Curves Page A 4 CM7 8 100Base T System User s Manual ...
Page 267: ...Microwave Networks CM System User s Manual PageB 37 ...
Page 268: ...Appendix B QuikLink Page B 38 CM System User s Manual ...
Page 282: ...Appendix D Alarm Codes Page D 6 5 02 05 CM 100Base T System User s Manual ...
Page 290: ...Appendix E Setting Frequency Page E 8 CM7 8 System User s Manual ...
Page 312: ...CM7 8 100Base T System User s Manual Page I 4 Microwave Networks ...