User's Manual
Table Of Contents
- Table of Contents
- List of Figures
- List of Tables
- 1 Introduction
- 2 Installation
- 3 Navigating the LCD Display Screens
- 3.1 Basic Operating Procedure
- 3.2 Starting Point: The Main LCD Touch Screen
- 3.3 LCD Display Flow Chart
- 3.4 Details of the Exciter Status Screens
- 3.4.1 System Status Screen
- 3.4.2 Transport Stream Status Screen
- 3.4.3 Adaptive Processing Board Status Screen
- 3.4.4 Digital Processing Screens
- 3.4.4.1 Modulator Board Status, Screen 1/2
- 3.4.4.2 ADC and DAC Boards Status, Screen 2/2
- 3.4.4.3 FLO FPGA Status, Summary, Screen 1/5
- 3.4.4.4 FLO FPGA, GPS & Clock Status, Screen 2/5
- 3.4.4.5 FLO FPGA, Transport Stream Status, Screen 3/5
- 3.4.4.6 FLO FPGA, SFN FIFO Status, Screen 4/5
- 3.4.4.7 FLO FPGA, MTI Status, Screen 5/5
- 3.4.5 IF & RF Processing Status Screens
- 3.4.6 System Control Status Screens
- 3.5 Built In Tests
- 3.6 Details of the System Setup Screens
- 3.7 RTAC Operating Procedures, Main Screen.
- 4 Theory of Operation
- 5 Maintenance and Troubleshooting
- 5.1 Exciter Maintenance
- 5.2 Loading Software
- 5.3 Default Settings For DIagnostics Screens
- 5.4 Typical Settings for the More Critical Exciter Setups
- 5.5 Exciter Troubleshooting Flow Charts
- 5.6 General Troubleshooting
- 5.7 System Troubleshooting
- 5.8 Exciter Troubleshooting
- 6 Parts List
- Appendix A Exciter GUI Screen Captures
APEX™ Exciter Incorporating FLO™ Technology
Typical Settings for the More Critical Exciter Setups Maintenance and Troubleshooting
2604s500.fm
03/08/07 888-2604-001 Page: 5-11
WARNING: Disconnect primary power prior to servicing.
5.4 Typical Settings for the More Critical Exciter Setups
Some of the critical setups, which can have a large effect on exciter and transmitter opera-
tion, are given in Table 5-2. The remainder of the exciter setups should be fairly obvious
when viewing the various setup screens. For additional information concerning the exciter
setup screens, see Section 3.6, Details of the System Setup Screens, on page 3-32.
Table 5-2 Typical Settings For Some of the More Critical Exciter Setup Functions
Setup Screen and location in
Technical Manual Function Typical Setting
Exciter Setup (screen 1 of 2)
Section 3.6.2, Exciter Setup
Screen, on page 3-35
Channel Set to correct channel
Frequency Offset Set to 0 or required offset in
Hz, the limit is +/- 50 kHz.
Waveguide
Provides group delay precorrection to
compensate for waveguide group delay.
None, if waveguide group
delay precorrection is not
required.
Select waveguide type and
enter length if waveguide
group delay precorrection is
required.
Power Limit Limits maximum exciter
power output (or transmitter
power output, if exciter is used
to control transmitter output
power)
RTAC Setup
Section 3.6.3, RTAC Setup
Screen, on page 3-38
Filter Type: Use FLO BANDPASS for this exciter.
Other Apex exciter application may use the following.
Standard if the standard D-Mask filter is used. Use Asymm (asymmetrical) if the
sharp tuned filter (sometimes called “Cool Fuel”) is used or if the group delay for
the transmitter is not symmetrical, such as when its output is reflected through an
adjacent channel sharp tuned filter in order to combine the two transmitters.
Exciter must be restarted to make filter change active.
Max. Peak Stretch (prevents nonlin correction
peaks form over driving solid state amps).
3db (may be set lower on some
transmitters.)
Off Air Mode (choices are Hold or Bypass) Hold
Display Chart Source (exciter spectrum analyzer display
input)
Tx Post HPF
External I/O
Section 3.6.5, External I/O
Setup Screen, on page 3-42
VSWR Foldback Threshold (low limit) 0.25 Vdc, see Note 1
VSWR Foldback Threshold (high limit) 5.0 Vdc, see Note 1
VSWR Foldback (max RF power reduction) 50% of normal exciter output
power, see Note 1
RF Cutoff (exciter output power level at which
control logic switches to backup exciter)
50% of the normal exciter
output power.
Note 1. Some transmitters use this feature for the transmitter output system VSWR foldback and other transmitters
use a separate circuit for VSWR foldback. Consult the transmitter technical manual for instructions
concerning VSWR foldback system and setup.