UHF Analog Driver/Transmitter/
Chapter 2, System Description,
Translator
Maintenance & Remote Control Connections
LX Series, Rev. 3
2-5
OVER MOD
DS3 (Red)
When lit it indicates the Video input level is too high.
ALT IF
DS7 (Green)
When lit it indicates that external or alternate 4.5MHZ is present.
10 MHz PRES
DS2 (Green)
When lit it indicates that a 10MHz reference is present to the
transmitter.
Table 2-8. Modulator Front Panel Control Adjustments
POTENTIOMETERS
DESCRIPTION
Video Gain (R42)
Adjusts the level of the output video.
Visual Level (R214) Adjusts the Visual IF level that combines with the Aural IF.
Aural Level (R243)
Adjusts the Aural IF level that combines with the Visual IF.
MONO (R110)
Adjusts the deviation level of the balanced audio input.
STEREO (R132)
Adjusts the deviation level of the composite audio input.
SAP/PRO (R150)
Adjusts the deviation level of the subcarrier audio input.
Table 2-9. Modulator Front Panel Sample
SMA CONNECTOR
DESCRIPTION
MOD IF SAMPLE (J10)
Sample of the combined Aural IF and Visual IF signals.
2.1.3 (A3) IF Processor Module
Assembly (1301938; Appendix B)
The (A3) IF Processor Assembly contains
the IF Processor Board (1301977). The IF
Processor provides pre-correction to
ensure broadcast quality output signal.
The pre-correction consists of amplitude
linearity correction, Incidental Carrier
Phase Modulation (ICPM) correction and
frequency response correction.
The IF Processor module is configured
either for an analog or digital system.
Pin 13C of the IF Processor module is
grounded in analog systems and left not
connected in digital systems. An IF
Processor Interlock signal is used to
report the presence of the IF Processor
module to the Control Monitoring board.
If the IF Processor interlock signal is not
present, the LX Series
Transmitter/Exciter Driver RF output is
Muted (turned off). If an analog IF
Processor module is installed and the
Modulation Present signal is not true,
the LX Series Transmitter/Exciter Driver
output is Muted (turned off).
The Control & Monitoring/Power Supply
module uses the IF Processor module for
System output power control. Through
the front panel display or a remote
interface, an operator can set the RF
output power level of the transmitter.
The range of RF power adjustment is
between 0% (full off) and 105% (full
power plus). A front panel IF Processor
module potentiometer sets the upper
limit of RF power at 120%. The
system's Control Monitoring board
compares the RF Power Monitoring
Содержание INNOVATOR
Страница 99: ...APPENDIX A LX SERIES ANALOG SYSTEM SPECIFICATIONS...
Страница 102: ...APPENDIX B DRAWINGS AND PARTS LISTS...
Страница 105: ...APPENDIX C TRANSMITTER LOG SHEET...