User's Manual

Digital ATSC Exciter-Modulator System Table of Contents
Axcera Axciter, Rev. 0 ii March 22, 2007
CHAPTER 4: AXCITER MODULATOR AND TRANSMITTER SET UP PROCEDURES................... 47
AXCITER ALIGNMENT OVERVIEW .................................................................................................................... 47
TRANSMITTER SET UP PROCEDURES ................................................................................................................ 47
SYSTEM PREPARATION..................................................................................................................................... 47
INITIAL TEST SET UP........................................................................................................................................ 47
SETTING UP THE OUTPUT POWER OF THE TRANSMITTER IN SLED-BASED SYSTEM .......................................... 48
SETTING UP OF AGC 1 ...................................................................................................................................... 48
SETTING UP OF AGC 2 ...................................................................................................................................... 48
SETTING UP OF OVERDRIVE THRESHOLD............................................................................................................ 48
(K2) AXCITER PRE AND POST FILTER SAMPLE VALUES.................................................................................. 49
UPCONVERTER DOWN CONVERTER ADJUSTMENT ............................................................................................... 49
SYSTEM CALIBRATION OF FORWARD AND REFLECTED POWERS USING THE HX OR LX DRIVER/AMPLIFIER, IN
SLED-BASED SYSTEMS..................................................................................................................................... 49
FORWARD POWER CALIBRATION ........................................................................................................................ 49
REFLECTED POWER CALIBRATION...................................................................................................................... 50
CHAPTER 5: MAINTENANCE...................................................................................................................... 51
MAINTENANCE ................................................................................................................................................. 51
APPENDIX A: SYSTEM & MODULATOR DRAWINGS......................................................................... A-1
APPENDIX B: UPCONVERTER/DOWNCONVERTER TRAY DRAWINGS (USED WITH
VISIONARY IOT TRANSMITTERS ........................................................................................................... B-1
APPENDIX C: UPCONVERTER AND DOWNCONVERTER MODULE ASSEMBLY DRAWINGS
(USED WITH INNOVATOR LX & HX SERIES TRANSMITTERS) ...................................................... C-1
APPENDIX D: GLOSSARY OF TERMS..................................................................................................... D-1