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Axcera Innovator LX Series Instruction Manual

Analog vhf low band transmitter
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Instruction Manual
Innovator
LX Series
®
Analog VHF Low Band
Transmitter
AXCERA
103 FREEDOM DRIVE • P.O. BOX 525 • LAWRENCE, PA 15055-0525 USA
(724) 873-8100 • FAX (724) 873-8105
www.axcera.com • service@axcera.com

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  • Page 1 Instruction Manual Innovator LX Series ® Analog VHF Low Band Transmitter AXCERA 103 FREEDOM DRIVE • P.O. BOX 525 • LAWRENCE, PA 15055-0525 USA (724) 873-8100 • FAX (724) 873-8105 www.axcera.com • service@axcera.com...

  • Page 2: Table Of Contents

    1.2 Assembly Designators ................1-1 1.3 Safety ....................1-2 1.4 Contact Information................1-2 1.5 Material Return Procedure ..............1-2 1.6 Limited One-Year Warranty for Axcera Products........1-3 CHAPTER 2 SYSTEM DESCRIPTION AND REMOTE CONTROL CONNECTIONS 2.0 System Overview..................2-1 2.1 Exciter/Amplifier Chassis Assembly............2-1 2.1.1 Modulator Module.................2-2 2.1.2 IF Processor Module ..............2-3...
  • Page 3 ® Innovator LX Series Analog VHF Transmitter Table of Contents TABLE OF CONTENTS (continued) SECTION PAGE 4.1.1.3 SAP/PRO, Subcarrier Audio Input ..........4-2 4.1.1.4 Audio Modulation of the 4.5 MHz VCO ........4-2 4.1.1.5 Phase Lock Loop (PLL) Circuit ..........4-2 4.1.1.6 Main Video Signal Path (Part 1 of 2) ........4-3 4.1.1.7 Delay Equalizer Circuits ............4-3 4.1.1.8 Sync Tip Clamp Circuit............4-4 4.1.1.9 Main Video Signal Path (Part 2 of 2) ........4-5...
  • Page 4 4.8.4.4 Schematic Page 3.............. 4-22 CHAPTER 5 DETAILED ALIGNMENT PROCEDURES 5.1 Module Replacement................5-1 5.1.1 Initial Test Setup................5-1 5.2 Innovator LX Series Exciter/Driver Chassis Assembly ........5-1 5.2.1 Modulator Module Assembly ............5-2 5.2.2 IF Processor Module Assembly ............5-3 5.2.3 Upconverter Assembly ..............5-3 5.2.4 Setting up the Drive Level of the Transmitter Procedure ....5-3...
  • Page 5 ® Innovator LX Series Analog VHF Transmitter Table of Contents LIST OF FIGURES FIGURE PAGE Brady Marker Identification Drawing..........1-1 Exciter/Driver Chassis Assembly Front View ........2-1 Exciter/Driver Chassis Assembly Rear View ........2-11 1 kW Minimum Ventilation Configuration...........3-4 Rear View exciter/driver chassis............3-5 Adjustments accessed through top of LX Exciter Chassis ....5-5 LX Series, Rev.
  • Page 6 ® Innovator LX Series Analog VHF Transmitter Table of Contents LIST OF TABLES TABLE PAGE LX Series Trays and Assemblies ............2-1 Modulator Front Panel Switch............2-2 Modulator Front Panel Status Indicators..........2-2 Modulator Front Panel Control Adjustments........2-3 Modulator Front Panel Sample ............2-3 IF Processor Front Panel Switch ............2-4 IF Processor Front Panel Status Indicators ........2-4 IF Processor Front Panel Control Adjustments........2-4...

  • Page 7: Manual Overview

    1.2 Assembly Designators Brady Marker is the rack or cabinet number on an interconnect cable or the Axcera has assigned assembly numbers, board number within a tray. The next number on an interconnect cable is the Tray location or number. The Brady...

  • Page 8: Safety

    1.4 Contact Information possible safety hazards that may be encountered while operating or servicing The Axcera Field Service Department can the product. Please review these be contacted by phone at (724) 873- warnings and familiarize yourself with the 8100 or by fax at (724) 873-8105.

  • Page 9: Limited One-Year Warranty For Axcera Products

    MRA# is included with the unit. The MRA# is intended to be used when Warranties are valid only when and if the unit is returned to Axcera. In (a) Axcera receives prompt written addition, all shipping material should be...
  • Page 10 ® Innovator LX Series Analog VHF Transmitter Chapter 1, Introduction F WARNING!!! × HIGH VOLTAGE Ø DO NOT ATTEMPT TO REPAIR OR TROUBLESHOOT THIS EQUIPMENT UNLESS FAMILIAR WITH OPERATION EXPERIENCED SERVICING HIGH VOLTAGE EQUIPMENT. LETHAL VOLTAGES ARE PRESENT WHEN POWER IS APPLIED TO THIS SYSTEM. IF POSSIBLE, TURN OFF POWER BEFORE MAKING ADJUSTMENTS TO THE SYSTEM.
  • Page 11 ® Innovator LX Series Analog VHF Transmitter Chapter 1, Introduction EMERGENCY FIRST AID INSTRUCTIONS Personnel engaged in the installation, operation, or maintenance of this equipment are urged to become familiar with the following rules both in theory and practice. It is the duty of all operating personnel to be prepared to give adequate Emergency First Aid and thereby prevent avoidable loss of life.
  • Page 12 ® Innovator LX Series Analog VHF Transmitter Chapter 1, Introduction VHF TELEVISION CHANNEL FREQUENCIES FREQ FREQ VISUAL COLOR AURAL L.O. FREQ LIMIT LIMIT CARRIER CHANNEL CARRIER CARRIER 45.75 + Vc HIGH (Vc) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz) 54.00 60.00 55.25 58.83 59.75...
  • Page 13 ® Innovator LX Series Analog VHF Transmitter Chapter 1, Introduction dBm, dBw, dBmV, dBµV, & VOLTAGE EXPRESSED IN WATTS 50 Ohm System WATTS PREFIX dBmV dBµV VOLTAGE 1,000,000,000,000 1 TERAWATT +150 +120 100,000,000,000 100 GIGAWATTS +140 +110 10,000,000,000 10 GIGAWATTS +130 +100 1,000,000,000...
  • Page 14 ® Innovator LX Series Analog VHF Transmitter Chapter 1, Introduction USEFUL CONVERSION FACTORS TO CONVERT FROM MULTIPLY BY mile (US statute) kilometer (km) 1.609347 inch (in) millimeter (mm) 25.4 inch (in) centimeter (cm) 2.54 inch (in) meter (m) 0.0254 foot (ft) meter (m) 0.3048 yard (yd)
  • Page 15 ® Innovator LX Series Analog VHF Transmitter Chapter 1, Introduction RETURN LOSS VS. VSWR 1.001 1.01 VSWR LX Series, Rev. 0...
  • Page 16 ® Innovator LX Series Analog VHF Transmitter Chapter 1, Introduction ABBREVIATIONS/ACRONYMS Alternating Current Light emitting diode Automatic Frequency Control Lower Sideband Automatic Level Control MPEG Motion Pictures Expert Group Amplitude modulation Output Automatic Gain Control Phase Locked Loop American wire gauge Printed circuit board Bit Error Rate Quadrature Amplitude...

  • Page 17: Chapter 2 System Description And Remote Control Connections

    ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections Chapter 2 System Description and Remote Control Connections 2.0 System Overview The LX Series transmitter is made up of ® The Innovator LX Series VHF the modules and assemblies as shown in Transmitter is a complete internally Figure 2-1 and listed in Table 2-1.
  • Page 18 ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections 2.1.1 (A2) Modulator Module modulator is broadcast quality and Assembly (1305420; Appendix A) provides front panel access to control and monitoring points. The video level is controlled through a sync tip clamp and sync and white clipping circuitry.
  • Page 19 ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections Table 2-5. Modulator Front Panel Sample SMA CONNECTOR DESCRIPTION MOD IF SAMPLE (J10) Sample of the combined Aural IF and Visual IF signals. 2.1.2 (A3) IF Processor Module system's Control Monitoring board Assembly (1305421;...
  • Page 20 ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections Table 2-6. IF Processor Front Panel Switch SWITCH FUNCTION When Manual ALC is selected, the reference ALC voltage is set by the ALC Gain front panel potentiometer. MAN/AUTO ALC When Auto ALC is selected, the IF level control circuit will automatically increase the IF output until the desired output...
  • Page 21 ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections This signal is applied to a second mixer The output of the mixer is applied to a mounted on the downconverter board 900 MHz Low pass filter to remove that converts it back to a broadcast unwanted conversion products.
  • Page 22 ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections 2.1.4 (A4) Control/Power Supply The (A4) Control & Monitoring/Power Module Assembly (1301936/110 VAC; Supply Assembly is made up of a Control Appendix A) Board (1302021), a Power Protection Board (1302837) and a Switch Board (1527-1406).
  • Page 23 ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections 2.1.5 (A6) VHF Power Amplifier The Power Amplifier module contains an Module (1305822; Appendix A) amplifier control and monitoring board. This board monitors the RF output power, RF reflected power, the current draw of amplifier sections, the supply voltage, and the temperature of the PA...

  • Page 24: Rf Output

    ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections Table 2-17. Power Amplifier Status Indicator FUNCTION When lit Green, it indicates that the PA is in the Operate Mode. If a ENABLED Mute occurs, the PA will remain Enabled, until the input signal is (Green) returned.

  • Page 25: Principles Of Operation

    ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections be extinguished and the DC OK on the Operate Mode with Mute Condition front panel will remain green. The enable indicator on the PA Module is The transmitter will remain in the extinguished.

  • Page 26: Maintenance

    2.4 Maintenance loss. When the modulated signal as reported by the IF Processor module is The Innovator LX Series transmitter is again present, the transmitter designed with components that require automatically returns to Operate mode.

  • Page 27: Customer Remote Connections

    ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections screw, mounted between the two It is recommended that the operating connectors, needs to be removed before parameters of the exciter driver and the module will pull out. After removal of transmitter be recorded from the LEDs on the screw, which is used to hold the the modules, the LCD system metering...
  • Page 28 ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections Table 2-20: LX Series Chassis Assembly Hard Wired Remote Interface Connections to TB30 or TB31, 18 pos. Terminal Blocks Located on the Rear of the Assembly Signal Name Signal Type/Description Designations...
  • Page 29 ® Innovator LX Series Analog VHF Chapter 2, System Description Transmitter and Remote Control Connections Signal Name Signal Type/Description Designations Analog Output (0 to 5.00 V). This is the input of IF IF Processor TB31-4 Processor module for system RF output power DLC Voltage control.

  • Page 30: Chapter 3 Site Considerations, Installation And Setup Procedures

    Innovator LX Series analog VHF transmitter can be installed. For example, The fans are designed and built into the if the installation is completed during cool...
  • Page 31 ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures all should be taken into account. Now 3. Do not separate the front of the that the amount of heat that must be transmitter from the back with the removed is known, the next step is to thought of air conditioning only the determine how to accomplish this.
  • Page 32 As with any equipment installation, it is delivery method must not be used. always good practice to consult the manufacturer when questions arise. Regular maintenance of any filters Axcera can be contacted at (724) 873- can not be overemphasized. 8100. LX Series, Rev. 0...

  • Page 33: Unpacking & Installing The Transmitter

    Any claims against in-transit damage should be directed to the carrier. NOTE: To remove the power amplifier Inform Axcera as to the extent of any module, mounted in the chassis damage as soon as possible. assembly, input and output cables must...

  • Page 34: Ac Input

    ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures 3.2.1 AC Input 3.3 Setup and Operation Once the chassis is mounted in the Initially, the transmitter should be turned equipment rack the AC can be connected on with the RF output at the “N”...

  • Page 35: Initial Turn On

    ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures Port Type Function Impedance RF Spare 2 RF Spare 1 Video Loop-Thru (Isolated) Visual IF Loop-Thru Input (Jumpered to J8) Aural IF Loop-Thru Input (Jumpered to J9) Upconverter RF Output (Jumpered to J24) Power Amplifier RF Input Power Amplifier RF Output...

  • Page 36: If Processor Module Leds On Front Panel

    ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures 3.4.1.2 IF Processor Module LEDs on 3.4.1.5 Power Amplifier Module LEDs Front Panel on Front Panel Fault Indicators: Status Indicators: INPUT FAULT: This illuminates Red if ENABLED: This illuminates Green when the visual IF input to the module is the PA is in operate.
  • Page 37 Main Screen. The Model Number, Code Version Number and Firmware Number for your system are displayed on this screen. Make note of these two numbers when conferring with Axcera on software problems. Table 3-4: Menu 10 - Main Screen: This is the default main screen of the transmitter. When the transmitter is in operate, the 'STB' characters appear, allowing an operator to place the transmitter in STANDBY, by pushing the right most button located under to display.
  • Page 38 ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures Table 3-6: Menu 12 - Transmitter Device Data Access Screen This screen of the transmitter allows access to various parameters of the transmitter system. This is the entry point to Menu 30, the System Details Screens, by pausing the ENT button.
  • Page 39 ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures Table 3-10: Menu 30-1 – System Details Screen arrows allow you to scroll through the different parameters of each device as ↓ ↑ shown in Table 3-11. Each System Component is a different screen. The proper IF Processor and the Power Amplifier will be programmed for your system.
  • Page 40 ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures Pushing the Down Arrow, after scrolling through all of the detail screens, will put you ↓ back to Menu 30, Table 3-9. Push the ESC button to exit the Transmitter Device Parameter Screens to Menu 12, Table 3-6, the Transmitter Device Parameter Access Screen.
  • Page 41 ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures Table 3-13: Menu 40-1 - Transmitter Set-up: Power Control Screen This screen of the transmitter is the first of several that allows access to transmitter set- up parameters.
  • Page 42 ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures Tray is used in your system, the LX Series Station ID is disabled. Therefore, the Station ID must be set up in the external Receiver Tray.) Table 3-18: Menu 40-7 - Transmitter Set-up: System Forward Power Calibration This screen is used to adjust the calibration of the system's forward power.
  • Page 43 ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures Table 3-22: Menu 40-13 - Transmitter Set-up: Forward Power Fault Threshold Screen This screen is used to set the minimum forward power fault threshold. When the transmitter is operating, it must operate above this value otherwise the system will shut down with fault for 5 minutes.

  • Page 44: Operation Procedure

    ® Innovator LX Series Analog VHF Chapter 3, Site Considerations, Transmitter Installation and Setup Procedures Table 3-26: Menu 40-19 - Transmitter Set-up: Remote Commands Control This screen is used to allow or deny the use of remote control commands. When disabled, remote commands are not used.

  • Page 45: Chapter 4 Circuit Descriptions

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies Chapter 4 Circuit Descriptions 4.0 (A2) Exciter/Driver Chassis present on the input. The outputs of U11A Assembly (1307715, 110 VAC; and U1B are applied to differential amplifier Appendix A) U11C.

  • Page 46: Sap/Pro, Subcarrier Audio Input

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies 3. The Diodes CR17, CR18, CR20 and connected to J41A pin 5A on the board, on CR21 protect the input stages of U14A page 3 of the schematic. This audio- and U14B if an excessive signal level is deviation level is connected to the front applied to the board.

  • Page 47: Main Video Signal Path (Part 1 Of 2)

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies frequency will be corrected by the AFC inputs are fed to Diodes CR1 to CR4, on error voltage. page 1 of the schematic, that form a voltage-limiter network in which, if the The PLL chip U21 also contains an input voltages exceed the supply voltages...

  • Page 48: Sync Tip Clamp Circuit

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies on J9 between pins 1 and 2. The video on. A sample of the main video from R44, at VIN connects through SW13 or R325 a at “P”, connects to U32 and U33, on page 2 0? resistor, on page 4 of the schematic, of the schematic, that provides a zero...

  • Page 49: Main Video Signal Path (Part 2 Of 2)

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies 4.1.1.9 Main Video Signal Path sensitive in terms of temperature stability. (Part 2 of 2) Crystal Y1 operates in an oscillator circuit A sample of the clamped video output consisting of transistor Q24 and its from the group delay circuitry through associated components.

  • Page 50: Visual Modulator Circuit

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies to a buffer amplifier Q20 to the K2 relay MHz signal with the 45.75 MHz IF CW at pin 14. The other path is through signal to produce the modulated 41.25- C152 to the amplifier U23A.

  • Page 51: If Processor Module

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies VDC_C1), page 3 on schematic. The +12 pins 1 and 2, the external Modulator Select VDC is filtered by L6, L7, and C27, on command at J42C Pin 14C controls the page 1 of schematic, before it is operation of the relays.

  • Page 52: Input Level Detector Circuit

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies environment. (If this is the case, the voltage for the op-amp is determined by transmitter will have to be serviced with the voltage divider that consists of R50 and the tray cover off in spite of the presence R51, off the +12 VDC line.

  • Page 53: Pin-Diode Attenuator Circuit

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies signal level to the detector at TP3 falls makes the diodes function as voltage- below this reference threshold, which variable resistors at this intermediate acts as a loss-of-signal peak detector frequency.

  • Page 54: Main If Signal Path (Part 2 Of 3)

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies diodes, the IF signal level is maintained The first corrector stage in the In Phase at the set level. path operates as follows. The In Phase IF signal is applied to transformer T9, which 4.2.1.6 Main IF Signal Path (Part 2 of 3) doubles the voltage swing by means of a...

  • Page 55: Main If Signal Path (Part 3 Of 3)

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies through the board. The main IF is fed The pre-distorted IF signal in the In through a resistor network that controls Phase path, connects to an op amp U18 the level of the IF by adjusting the whose output level is controlled by R238.

  • Page 56: Fault Command

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies circuit, CR1, CR2 & CR3, located on page SW1 is in the Automatic position, it will 1 of the schematic. The high forward cause the ALC pin-diode attenuators CR1, biases them more or less, that increases CR2, and CR3 to have less attenuation and or decreases the IF level, therefore the...

  • Page 57: Downconverter Board

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies the schematic) by L30, L41, and C80 sets the output level of the board and is before it is applied to the rest of the controlled either by a manual gain pot R7, board.

  • Page 58: First Conversion Board

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies harmonic content and leaves the board The board also generates various voltages at J3 at a level of +20 dBm. used by the rest of the boards in the upconverter.

  • Page 59: Power Protection Board

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies processor module, and the error voltage #2 input after the F2 fuse is split with one generated by U4D and applied to the line connected back to Jack J1 at Pin 5, external pin attenuator.

  • Page 60: Schematic

    ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies lines from J4 to U1. LED DS10 will be lit 4.4.1.2 -12 VDC Circuits when programming port J4 is enabled. -12 VDC from the Switching Power U2 is a watchdog IC, which holds the Supply Assembly connects to J5 on the microcontroller in reset, if the supply...
  • Page 61 ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies IC is used as an input buffer to allow the back to the microprocessor. Each analog microcontroller to monitor various digital input is expected to be between 0 and 5 input values.
  • Page 62 ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies transistor and the current limiting information from the selected source to resistors in the collector to the +12 VDC the display. By pushing the button again, source.
  • Page 63 ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies 4.4.4 (A2) Switching Power Supply on the rear of the exciter/amplifier chassis Assembly assembly. The power supply module contains a 4.8.1 (A2) VHF Low Band Driver switching power supply, an eight Assembly (1153-1107;...
  • Page 64 ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies The +28 VDC is also used to produce the halves of Q1. The drain voltage is source bias voltage to both halves of Q1. connected through the feedthru capacitor The +28 VDC is connected through R5 to FL1, R7 and L1, an RF Isolation Network, the Bias Adjust pot R3 to the Source of...
  • Page 65 ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies following functions: overdrive cutback, microprocessor in reset, if the supply when the drive level reaches the amount voltage is less than 4.21 VDC. U5 needed to attain 110% output power; momentarily resets the microcontroller if and overtemperature, VSWR, and Pin 6 (!ST) is not clocked every second.
  • Page 66 ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies U10A is used to turn Off the gate of Q14 pins 1 & 2 on the board and is wired to in the event of high current in amplifier the comparator IC U13B.
  • Page 67 ® Innovator LX Series Analog VHF Chapter 4, Circuit Descriptions, Transmitter Control/Exciter Cabinet Assemblies measurements is completed through software. Only the Aural Null and Offset Null, if used, need to be done through front panel pots. NOTE: In this configuration the output of U23 at pin 4 is not used.

  • Page 68: Chapter 5 Detailed Alignment Procedures

    Do not try to place a Module in the module. The failed module can then be wrong slot as this may damage the slot sent back to Axcera for repair. Contact or the blind mate connectors. Axcera Customer Service Department at 724-873-8100 or fax to 724-873-8105, 5.1.1 Initial Test Set Up...

  • Page 69: Modulator Module Assembly

    ® Innovator LX Series Analog VHF Chapter 5,Detailed Transmitter Alignment Procedures adjustments of the drive level to the ALTERNATE IF (DS7) – Red Indicates Power Amplifier and the adjustment of that an external 45.75 MHz IF is not the linearity and phase predistortion to present to the modulator.

  • Page 70: If Processor Module Assembly

    ® Innovator LX Series Analog VHF Chapter 5,Detailed Transmitter Alignment Procedures the modulator, as necessary, for the drive level, no cutback, or Red cutback, ±15-kHz deviation. too much drive level to driver module. 5.2.2 IF Processor Module Assembly Manual AGC (DS6) - Displays status of the control of the AGC level, either Verify that all red LEDs located on the IF Green, in AGC, AGC Adj.

  • Page 71: Linearity Correction Adjustment

    ® Innovator LX Series Analog VHF Chapter 5,Detailed Transmitter Alignment Procedures back down to 160-16=144, if it affects predistortion. A positive aspect of power at 100, drop it down by 10 to 90, linearity adjustment with the ALC etc….). Slowly turn the AGC Cutback Enabled is that the control movements Pot Counterclockwise until the AGC will not affect peak power.
  • Page 72 ® Innovator LX Series Analog VHF Chapter 5,Detailed Transmitter Alignment Procedures Adjust for proper Differential Gain and Luminance Nonlinearity Adjusts depth of Preset Notches Adjust to flip correction direction Adjust for ICPM and Phase Distortions Reversible diodes flip the direction of adjustment Black Stretch affects Differential Gain and...

  • Page 73: Differential Phase And Icpm Corrector Adjustment

    If a correct whatever differential phase problem occurred during alignment, remains after the ICPM correctors are contact Axcera field service at (724) 873- properly adjusted. Monitor the 8100. differential phase of the Transmitter LX Series, Rev. 0...
  • Page 74 Appendix A LX Series VHF Low Band Transmitter Drawings...
  • Page 75 LX Series VHF Transmitter Appendix A, System Innovator LX Series VHF Transmitter System LX Series Analog Transmitter Block Diagram .......... 1309398 LX Series Analog Transmitter System Interconnect ......... 1309399 Chassis Assembly, 110 VAC Exciter, V2, LX Series Interconnect ..................1304064 Backplane Board, V2, LX Series Schematic ..................
  • Page 76 LX Series VHF Transmitter Appendix A, System Switch Board Schematic ..................1527-3406 20W Analog Power Amplifier Assembly, Low Band Block Diagram..................1307159 Interconnect ..................1307158 VHF Coupler Schematic ..................1153-3104 VHF Low Band Driver Board Schematic ..................1153-3107 VHF Low Band Output Amplifier Board Schematic ..................
  • Page 77 Appendix B SYSTEM SPECIFICATIONS...

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