Nautel XL12, Technical Instructions

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12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 3)
01 January 2002
TABLE OF CONTENTS
(Continued)
Section Page
2 INSTALLATION
(Continued)
2.2.6.1 Installation of Reference Ground Stud................................................................. 2-14
2.2.6.2 Installation of Fan Trays .................................................................................... 2-14
2.2.6.3 Installation of RF Power Modules ....................................................................... 2-14
2.2.6.4 Installation of Main Power Transformer................................................................ 2-15
2.2.6.5 Connection of Power Transformer (A23A1) Wiring................................................ 2-15
2.2.7 AC POWER CONNECTION..................................................................................... 2-16
2.2.7.1 Installation of Circuit Breaker Enclosure.............................................................. 2-16
2.2.7.2 Installation of AC Power Wiring (Service Entrance to Enclosure) ........................... 2-16
2.2.7.3 Installation of AC Power Wiring (Enclosure to Transmitter) ................................... 2-16
2.2.8 INSTALLATION OF RF FEED CABLE ...................................................................... 2-17
2.2.9 INSTALLATION OF EXTERNAL WIRING................................................................... 2-17
2.2.9.1 External Control Wiring ..................................................................................... 2-18
2.2.9.2 RF Performance Monitoring Wiring..................................................................... 2-18
2.2.9.3 Alarm/Status Monitor Wiring.............................................................................. 2-18
2.2.9.4 Audio Wiring .................................................................................................... 2-19
2.2.9.5 External RF Drive Wiring ................................................................................... 2-19
2.2.10 REASSEMBLY ...................................................................................................... 2-19
2.2.11 REFERENCE GROUND INTERCONNECTION .......................................................... 2-19
2.3 TECHNICAL PRE-COMMISSIONING....................................................................... 2-21
2.3.1 AC POWER SOURCE VARIABLES......................................................................... 2-21
2.3.1.1 Main Power Transformer Primary Tap Selection................................................... 2-21
2.3.1.2 Low Volts Pwr Supply Transformer Primary Tap Selection.................................... 2-21
2.3.2 EXCITER RF DRIVE PWB OPTIONS ....................................................................... 2-22
2.3.2.1 Exciter A's RF Drive PWB................................................................................. 2-22
2.3.2.2 Exciter B's RF Drive PWB................................................................................. 2-22
2.3.3 INTERNAL/EXTERNAL RF DRIVE SOURCE ............................................................. 2-22
2.3.4 FREQUENCY DEPENDENT VARIABLES ................................................................ 2-22
2.3.5 AUDIO PASS BAND SELECTION............................................................................ 2-23
2.3.6 AUDIO CHOICES ................................................................................................... 2-23
2.3.7 REMOTE CONTROL CHOICES ............................................................................... 2-23
2.3.7.1 Differential Inputs.............................................................................................. 2-23
2.3.7.2 Single Ended Inputs.......................................................................................... 2-23
2.3.8 ALARM/STATUS OUTPUT CHOICES....................................................................... 2-24
2.3.8.1 Logic False - Open Collector ............................................................................. 2-24
2.3.8.2 Logic False - +5VDC ........................................................................................ 2-24
2.3.9 ALARM DISPLAY OPTIONS ................................................................................... 2-25
2.3.9.1 Continuous Alarm Display ................................................................................. 2-25
2.3.9.2 Flashing Alarm Display ..................................................................................... 2-25
2.4 COMMISSIONING PROCEDURES .......................................................................... 2-26
2.4.1 PRECAUTIONS TO BE OBSERVED........................................................................ 2-26
2.4.2 TURN ON PREREQUISITES ................................................................................... 2-26
2.4.3 INITIAL TURN-ON ................................................................................................... 2-27
2.4.4 RF DRIVE CHECKS ............................................................................................... 2-29
2.4.4.1 RF Drive Frequency .......................................................................................... 2-29
2.4.4.2 RF Drive Symmetry .......................................................................................... 2-29
2.4.4.3 RF Drive Level .................................................................................................. 2-30
2.4.5 CHECK OF RF POWER STAGES........................................................................... 2-30