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Axcera CHV400BTD Technical Manual

Atsc vhf high band transmitter
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Technical Manual
Innovator,
CHV400BTD,
ATSC VHF High Band Transmitter
Axcera, LLC
103 Freedom Drive, P.O. Box 525, Lawrence, PA 15055-0525, USA
PHONE: 724-873-8100 • FAX: 724-873-8105
www.axcera.com
• info@axcera.com

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  • Page 1 Technical Manual Innovator, CHV400BTD, ATSC VHF High Band Transmitter Axcera, LLC 103 Freedom Drive, P.O. Box 525, Lawrence, PA 15055-0525, USA PHONE: 724-873-8100 • FAX: 724-873-8105 www.axcera.com • info@axcera.com...
  • Page 2 RESTRICTIONS ON USE, DUPLICATION OR DISCLOSURE OF PROPRIETARY INFORMATION This document contains information proprietary to Axcera, to its affiliates or to a third party to which Axcera may have a legal obligation to protect such information from unauthorized disclosure, use or duplication. Any disclosure, use or duplication of this document or any of the information herein for other than the specific purpose for which it was disclosed by Axcera is expressly prohibited, except as Axcera may otherwise agree in writing.

  • Page 3: Table Of Contents

    Manual Overview ....................1 Assembly Designators ..................1 Safety ......................1 Contact Information..................3 Return Material Procedure ................3 Limited One Year Warranty for Axcera Products..........4 Unpacking and Installation ................11 Unpacking ....................11 Installation ....................11 Tray Slide Installation ................12 AC Input Connections ..................13 Input and Output Connections ................
  • Page 4 Innovator CHV400BTD ATSC Transmitter Table of Contents (A9 & A10) Power Supplies used in CHV20B, CHV200B, and Driver for CHV400B & higher power ....................59 Circuit Description of External System Metering Board which is only used in Transmitters with multiple external Amplifier Trays ..........60 (A5) System Metering Board (1312666) ............

  • Page 5: Introduction

    Introduction Introduction Manual Overview This manual contains the description of the Innovator CHV400BTD ATSC Transmitter and the circuit descriptions of the boards, which make up the system. The manual also describes the installation, setup and alignment procedures for the system.
  • Page 6 Retain Manuals – The manuals for the system should be retained at the system site for future reference. Axcera provides two manuals for this purpose; one manual can be left at the office while the other can be kept at the site.

  • Page 7: Contact Information

    When shipping an item to Axcera, please include the RMA# on the packing list and on the shipping container. The packing slip should also include contact information and a brief description of why the unit is being returned.

  • Page 8: Limited One Year Warranty For Axcera Products

    (a) repairing or replacing (in Axcera's sole discretion) any defective parts free of charge (F.O.B. Axcera’s plant) and/or (b) crediting (in Axcera's sole discretion) all or a portion of the purchase price to the buyer.
  • Page 9 Innovator CHV400BTD ATSC Transmitter Introduction WARNING!!! HIGH VOLTAGE 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 10 Innovator CHV400BTD ATSC Transmitter 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 11: Temperature Conversion

    Innovator CHV400BTD ATSC Transmitter Introduction dBm, dBw, dBmV, dBµ µ µ µ V, & 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...
  • Page 12 Innovator CHV400BTD ATSC Transmitter 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) meter (m) 0.9144...
  • Page 13 Innovator CHV400BTD ATSC Transmitter Introduction RETURN LOSS VS. VSWR 1.001 1.01 VSWR Technical Manual, Rev. 0...
  • Page 14 Innovator CHV400BTD ATSC Transmitter Introduction ABBREVIATIONS/ACRONYMS Alternating Current dBmV Decibel referenced to 1 millivolt Automatic Frequency Control Decibel referenced to 1 watt Automatic Level Control Forward Error Correction Amplitude Modulation Frequency Modulation Automatic Gain Control FPGA Field Programmable Gate Array...

  • Page 15: Unpacking And Installation

    Carefully open each package and inspect the contents for damage. Verify that all materials are enclosed as listed on the packing slip. Report any shortages to Axcera. In the event any in transit damage is discovered, report it to the carrier. Axcera is not responsible for damage caused by the carrier.

  • Page 16: Tray Slide Installation

    Innovator CHV400BTD ATSC Transmitter Unpacking and Installation The Innovator CXB Series systems are 17” (43.2cm) wide standard rack mountable trays. They are supplied with side mounted Tray Slides for ease of installation and removal. The CHV200 system is 3 RU, 5.25” (13.3cm), high. The CHV400 and CHV500 systems are 9 RU, 15.75”...

  • Page 17: Ac Input Connections

    Innovator CHV400BTD ATSC Transmitter Unpacking and Installation AC Input Connections The CHV200B single tray systems will operate with an input voltage of 185-253VAC. The customer should provide a single point disconnect for the main AC input connection to the transmitter. Check that the AC switch, located on the rear of the tray above the AC power jack, is OFF.

  • Page 18: Input And Output Connections

    Innovator CHV400BTD ATSC Transmitter Unpacking and Installation CHV1000B 1000 Watts 5100 Watts 230 VAC 22.2 Amps to the Cabinet CHV1500B 1500 Watts 7200 Watts 230 VAC 31.3 Amps to the Cabinet CHV2000B 2000 Watts 10000 Watts 230 VAC 43.5 Amps to the Cabinet...
  • Page 19 Innovator CHV400BTD ATSC Transmitter Unpacking and Installation NOTES: If your CHVBTD system contains an Optional ASI to S310 Converter, connect the ASI output of the STL to the ASI in jack on the rear panel of the converter. Connect the SMPTE-310 Output from the SMPTE 310 Out jack on the rear panel of the converter module to the input jack J1 on the rear panel of the CHV200B and the driver tray for the CHV400B and higher power systems.
  • Page 20 Innovator CHV400BTD ATSC Transmitter Unpacking and Installation In Translator (BRD) systems there is a SMPTE-310 loop-thru from the output of the Demodulator Board at J4, mounted on the rear panel of the transmitter or driver tray, to the input to the Modulator Board at J5, mounted on the rear panel of the transmitter or driver tray.

  • Page 21: Initial On Site Turn On Procedure

    Amber it indicates that an Event (Fault) occurred since that last time the Event (Fault) indications were reset. The output power is factory set according to customer request and does not need adjusted. If a problem occurs, call Axcera field support at 724-873-8100 for information on modifying the power level of the system.

  • Page 22: Typical System Operating Parameters

    Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Typical System Operating Parameters Typical Operating Parameters for a CHV20 Parameter Typical Reading Forward Power 100% Reflected Power <5% Power Supply Voltage 42 Volts Heatsink Temperature 20º to 30º F above ambient temperature...

  • Page 23: Typical Problems, Indications And Causes In Chv200B Tray

    Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Typical Problems, Indications and Causes in CHV200B Tray Problem Indication Cause AC power cord not connected. Main AC to System missing. No power to Operate/Standby and Enable LED On/Off switch on back of tray...
  • Page 24 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 4: Innovator CXB Series LCD Display DISPLAY FUNCTION Provides a two line readout of the input received channel, internal functions, status, and Fault (Event) conditions. The front panel has seven pushbuttons, two for the control of the system, Operate & Standby, and five for control of the displayed menus, Left, Right, Up, Down &...

  • Page 25: System Remote Connections

    Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure A Green LED indicates that the system is functioning normally with no STATUS faults. A flashing Red LED indicates an Event (Fault) is occurring at (Green/Red/ this time. An Amber LED indicates an Event (Fault) occurred since the...

  • Page 26: Lcd Front Panel Screens

    Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Remote Signal Signal Type Description Name Designation Discrete Open Collector Input. – Selects one of two possible Channel Setups of the Set Channel system. (Set Up 1 or Set J12-7...
  • Page 27 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Splash Screen Number 2 The second splash screen indicates the Firmware and Version Numbers of the software used in the system. The example shown is Firmware number 1312423: Version number 4.2/2.4.

  • Page 28: Operation Screens

    Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure The following screens are typical of an operating system. The values indicated on the screens in your system may vary from those shown below. Operation Screens NOTE: The following Operation screens provide operating information only. No adjustments are available using these screens.
  • Page 29 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 10.1: Transmitter/Translator Device Details Exciter Values Screen (BTD/BRD) This is the System Device Details Exciter Values Main Sub Screen. Push the ENTER button to access the Device Details Exciter Values submenus or push the DOWN Arrow to view the next main submenu, which is the 8VSB Demodulator Sub Menu.
  • Page 30 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 10.1.7: AGC Overdrive Details Screen (BTD/BRD) This menu indicates if the AGC circuit is operating within its range. Table 10.1.8: AGC Auto/Manual Details Screen (BTD/BRD) This menu indicates if the AGC circuit is operating in Auto or Manual.
  • Page 31 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Pushing the Left Arrow will display the System Device Details 8VSB Demodulator Values Main Sub Screen and then pushing the Down arrow will access the System Device Details 8VSB Modulator Main Sub Screens.
  • Page 32 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 10.4.1: IF Processor Input Details Screen (BTD/BRD) This menu indicates if there is an input signal to the IF Processor. Table 10.4.2: IF Processor Modulation Present Details Screen (BTD/BRD) This menu indicates if there is Modulation on the signal to the IF Processor.
  • Page 33 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 10.6: Downconverter Device Details Screen (BTD/BRD) NOTE: This screen is only used with an Axciter. This is the System Device Details Downconverter Main Sub Screen. Push the ENTER button to access the Device Downconverter submenus or push the DOWN Arrow to go to the External Amplifier Device Details Screen, if present, or back to the Device Details Exciter Values screen.
  • Page 34 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 10.7.4: External Amplifier#1 I2-A2 Current Details Screen (BTD/BRD) Indicates Current of the A2 device in the external amplifier #1. NOTE: See the final test data sheet for the typical current value.

  • Page 35: Set Up Screens

    Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Set Up Screens Table 11: Transmitter/Translator Set Up Main Screen (BTD/BRD) This is the System Set Up Main Screen. Push the ENTER button to access the Authorization Warning Main Sub Screen or since this is the final Main Screen, pushing the DOWN Arrow will take you back to the System RF Power Default Screen.
  • Page 36 This causes the system to access the proper parameters to be displayed on the LCD screens. NOTE: Do not change this screen without first consulting with Axcera. Table 11.1.3: Chassis Values Jump to Menu on Fault Set Up Screen (BTD/BRD) This screen allows the user to select if the system will change the display automatically.
  • Page 37 / password file of the Ethernet controller. If this operation is selected, ON, the username / password file is replaced with the user name set to ‘admin’ and the password set to ‘axcera’. Table 11.1.11: Chassis Values Ethernet Address Set Up Screen (BTD/BRD) When the optional Ethernet Controller module is present, this screen is used to view or change the Ethernet TCP Address of the controller.
  • Page 38 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 11.3: 8VSB Modulator Main Set Up Menu Screen (BTD/BRD) This is the System Set Up 8VSB Modulator Main Sub Screen. Push the ENTER button to access the Set Up 8VSB Modulator submenus or push the DOWN Arrow to view the next Set Up Main Sub Screen, which is the Set Up Upconverter Main Sub Screen.
  • Page 39 Turn On Procedure Interface Jack J12 located on the rear panel of the Exciter/Driver Tray. Changes should only be made while the transmitter is in standby. Contact Axcera Field Service before using this menu. With a Channel or Custom Frequency screen displayed, the Channel type can be set to the American Channel, European Channel, Custom UHF Frequency or Custom VHF Frequency by first pushing the enter button.
  • Page 40 Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 11.5.1: Downconverter RF Input Level Screen This screen allows the operator to monitor the RF input level and to set the desired input value. Technical Manual, Rev. 0...

  • Page 41: System Description

    Innovator CHV400BTD ATSC Transmitter System Description System Description The Innovator CHVB Series Systems are of two different types. They are either Regenerative Translators, example: CHV200BRD, or DTV Transmitters, example: CHV200BTD. The Regenerative Translator (BRD) accepts an RF On Channel signal (-79 to –8 dBm) and converts it to a DTV RF On Channel output signal.
  • Page 42 Innovator CHV400BTD ATSC Transmitter System Description A1) the VHF HB Pre-Driver Amplifier (1313899) and (A6-A2) the 100 Watt Amplifier Pallet, Italmec (1313484). The assembly has approximately 36 dB of gain. The amplified output at approximately +38 dBm connects to the (A7) Output Metering...
  • Page 43 Innovator CHV400BTD ATSC Transmitter System Description connected to the combiner will be dissipated by the reject load with the other half of the power going to the output filters and the antenna. The CHV1500B is made up of a driver tray, a two way splitter, two CHV750B amplifier trays and a two way combiner with reject load.
  • Page 44 Innovator CHV400BTD ATSC Transmitter System Description This page intentionally left blank. Technical Manual, Rev. 0...

  • Page 45: (Optional) Innovator Chvb Series Web Ethernet Interface

    Innovator CHV400BTD ATSC Transmitter Web Ethernet Interface Description (Optional) Innovator CHVB Series Web Ethernet Interface The Innovator CHVB Series Web Ethernet Interface (1310183) allows for the monitoring and control of the Innovator CHVB Series system without the need for special software on the remote computer.
  • Page 46 Innovator CHV400BTD ATSC Transmitter Web Ethernet Interface Description Figure 9: Typical Ethernet Main Control/Monitoring Screen After logging in, the main control/monitoring screen is displayed, allowing operate and standby control and read back of the system parameters. Refer to Figure 9 for a typical main control/monitoring screen.
  • Page 47 Innovator CHV400BTD ATSC Transmitter Web Ethernet Interface Description Figure 10: External Amplifier Status Screen This screen indicates the status of the External Amplifier Trays giving all the main operating parameters. Figure 10 shows a typical status screen for two external amplifier trays.
  • Page 48 Innovator CHV400BTD ATSC Transmitter Web Ethernet Interface Description Figure 11: Typical Ethernet Configuration Menu For the first time configuration of the system, the following must be completed. A computer must be placed on the same LAN as the Innovator CHVB Series system, (NOTE: The Innovator CHVB does not serve DHCP addresses –...
  • Page 49 Innovator CHV400BTD ATSC Transmitter Web Ethernet Interface Description Figure 12: Typical Account Management Screen The Innovator CHVB supports up to 5 different users. To add or change one of the accounts click the Add/Change button in the row of the account you want to modify, then enter the desired name, password, and administrator rights for the user and click save.
  • Page 50 Innovator CHV400BTD ATSC Transmitter Web Ethernet Interface Description NOTE: The Reset Ethernet User ID Screen, in the Set Up Menus on the LCD Display, allows the user the option of resetting the User name and Password for the Ethernet. The Yes or No selection can be changed by pushing the Up or Down Button.

  • Page 51: (Optional) Innovator Chvb Series Snmp Ethernet Interface

    Innovator CHV400BTD ATSC Transmitter SNMP Ethernet Interface Description (Optional) Innovator CHVB Series SNMP Ethernet Interface NOTE: The Innovator CHVB Series SNMP Ethernet Interface (1313079) includes the Web Ethernet Interface described in the previous section of this manual. These interfaces may not be part of your system.
  • Page 52 Innovator CHV400BTD ATSC Transmitter SNMP Ethernet Interface Description This page intentionally left blank. Technical Manual, Rev. 0...

  • Page 53: Circuit Descriptions Of Boards In The Chv200B System

    Innovator CHV400BTD ATSC Transmitter Board Descriptions Circuit Descriptions of Boards in the CHV200B System (A1) 8 VSB Demodulator Board (1308275) - Only used with BRD operation Overview The 8 VSB demodulator assembly receives an off air 8 VSB signal on any VHF or UHF channel and demodulates this to an MPEG-2 transport stream that is per the SMPTE- 310M standard.

  • Page 54: (A2) Digital Modulator Board (1304883), Part Of The Digital Modulator

    Innovator CHV400BTD ATSC Transmitter Board Descriptions (A2) Digital Modulator Board (1304883), Part of the Digital Modulator w/Power Conditioner (1309629) The Digital Modulator w/Power Conditioner (1309629) is made up of the Digital Modulator Board (1304883) and the Power Conditioner Board ((1309404).

  • Page 55: Voltage Requirements

    Innovator CHV400BTD ATSC Transmitter Board Descriptions The FPGA subsequently provides error signals to an analog phase locked implemented with op amp stages U45-A, B and C. The output of these compensation stages is used as the control voltage to the VCXO, U37.

  • Page 56: Pin-Diode Attenuator Circuit

    Innovator CHV400BTD ATSC Transmitter Board Descriptions Linear adjustments. The board has the circuitry for ALC Fault, Input Fault and Modulation Fault monitoring and indications. The input IF signal at J2, typically 0 dBm peak power centered at 36 or 44 MHz, is fed to a splitter circuit Z1 which produces two equal outputs, one at Port 1 and the other at Port 2.

  • Page 57: Frequency Response Corrector Circuit

    Innovator CHV400BTD ATSC Transmitter Board Descriptions of R67 is buffered by the unity-gain amplifier U5A. This reference voltage is then applied to R68, R71, and C33 through L11 to the CR9 diode. C33 keeps the reference from sagging during the vertical interval. The .9 VDC reference voltage is applied to the unity- gain amplifier U5B.

  • Page 58: Input Fault And Modulation Fault Circuitry

    Innovator CHV400BTD ATSC Transmitter Board Descriptions The output of U3B connects through S1 pins 2 to 3, if it is in the ALC position, to the pin- diode attenuator circuit, CR1, CR2 & CR3. The high forward biases them more or less, that increases or decreases the IF level, therefore the output level.

  • Page 59: Vdc, +6.8 Vdc, And Vref Needed To Operate The Board

    Innovator CHV400BTD ATSC Transmitter Board Descriptions other High output of U4B is connected to U12B pin 5 whose output at pin 7 goes High. This high connects to the gate of Q8 Biasing it On. With Q8 On, a low is connected to J7-2, Modulation Loss, which is wired to the Control Board for control and monitoring.

  • Page 60: (A5) Alc Board, Innovator Cx Series (1308570)

    Innovator CHV400BTD ATSC Transmitter Board Descriptions The upconverter has two local oscillators, LO1 and LO2. The LO1 oscillator consists of U1, U2, U5, U6 and amplifiers U3 and U4. The LO1 oscillator operates at 1 GHz for 44 MHz IF inputs and is used to convert the signal to 1044 MHz. In 36 MHz IF systems, this oscillator circuit operates at 1.008 GHz.

  • Page 61: (A6) Amplifier Assembly (1313959) - Used In The Chv20B Tray

    Innovator CHV400BTD ATSC Transmitter Board Descriptions gain pot R62. When the switch is in either ALC or manual, the voltage in the unused circuit is preset low by the circuitry connected to pins 4-6 on SW1. This allows the RF power to ramp up slowly to full power when the switch changes positions.

  • Page 62: (A6-A2) 50 Watt Amplifier Pallet, Italmec (1313484)

    Pallet, Italmec. (A6-A2) 50 Watt Amplifier Pallet, Italmec (1313484) The 50 Watt Amplifier Pallet, Italmec is made by Italmec for Axcera’s use. This broadband amplifier operates in the frequency range of 170 to 240 MHz. The amplifier is capable of delivering a maximum output power of 25 Watts digital, with an amplification factor of approximately 24 dB.

  • Page 63: (A8) Control Card, Innovator Cx (1312543)

    Innovator CHV400BTD ATSC Transmitter Board Descriptions (A8) Control Card, Innovator CX (1312543) The Innovator CX control board provides the overall system control for the CXB system. There are two main elements of the board, U7 and U9. U7 is a programmable logic device that is loaded with firmware, which provides the overall system control.

  • Page 64: Circuit Description Of External System Metering Board Which Is Only Used In Transmitters With Multiple External Amplifier Trays

    Innovator CHV400BTD ATSC Transmitter Board Descriptions Board to the IF Precorrector, the Digital Upconverter, the ALC, the Amplifier Assembly and the Output Metering Detector Boards. The +28/+42VDC outputs of the (A10) power supply connect to the (A8) CX Control Board, which then supplies the switched +24/+42VDC to the (A6) Amplifier Assembly.

  • Page 65: Circuit Descriptions Of Boards In The Chv400, 400 Watt Atsc Amplifier Tray

    Innovator CHV400BTD ATSC Transmitter Board Descriptions Circuit Descriptions of Boards in the CHV400, 400 Watt ATSC Amplifier Tray (A7) Amplifier Control Board (1312260) Amplifier Control Board The Amplifier Control Board is mounted in the top front facing the rear of the Amplifier Tray as shown above.

  • Page 66: (A5) 2 Way Splitter Board (1313941), In Chv400B

    Innovator CHV400BTD ATSC Transmitter Board Descriptions board. The +42VDC input at the TB8 input senses the current to the (A3) 878 output amplifier pallet through TB7 on the board. The +42VDC input at the TB10 input senses the current to the (A4) 878 output amplifier pallet through TB9 on the board.

  • Page 67: (Optional) Asi To S310 Converter Module

    The ASI to SMPTE310M converter takes the STL ASI feed input, if present in your system, and converts it to a SMPTE310M output which connects to the input to the Axcera system. The converter contains an ASI Motherboard (1311179), an ASI to 310 Conversion Board, Non-SFN (1311219) or ASI to 310 Conversion Board, SFN (1309764), and a 120 VAC to +12 VDC converter module.

  • Page 68: Asi To 310 Conversion Board, Sfn (1309764)

    Innovator CHV400BTD ATSC Transmitter Board Descriptions ASI to 310 Conversion Board, SFN (1309764) The ASI signal is input to the ASI to S310 conversion board via J1. U2 de-serializes the ASI input signal into a parallel byte stream. The parallel byte stream is clocked into U6 which buffers and converts it to a valid S310 bi-phase encoded signal.

  • Page 69: System Set Up Procedure

    If a board fails, that board needs to be changed out with a replacement board. The failed board can then be sent back to Axcera for repair. NOTE: Contact Axcera Customer Service Department at 1-724-873-8100 or fax to 1-724-873-8105, before sending in any board or module.

  • Page 70: Set Up Of The If Precorrector Board In The System

    Innovator CHV400BTD ATSC Transmitter System Set Up Procedure AUTO/MAN 1.0VDC Figure 15: (A3) IF Pre-Corrector Board (1308796) Set Up of the IF Precorrector Board in the System Refer to Figure 15. Check that the Auto/Man switch S1 on the IF Pre-Corrector Board is in the Automatic ALC position.

  • Page 71: Alc Board Set-Up, Forward And Reflected Power Calibration For Chv200B Systems

    Innovator CHV400BTD ATSC Transmitter System Set Up Procedure ALC Board Set-Up, Forward and Reflected Power Calibration for CHV200B Systems NOTE: If your system is a CHV400B or higher power with one or more external amplifier trays, refer to the next section for the forward and reflected power calibration procedures.

  • Page 72: Forward And Reflected Power Calibration Of Chv400B And Higher Power Systems With One Or More External Amplifier Trays

    Innovator CHV400BTD ATSC Transmitter System Set Up Procedure ALC ADJ OVERDRIVE THRESHOLD AUTO/MAN MAN ADJ Figure 16A: (A5) ALC Board (1308570) Refer to Figure 16A. Turn the output power down to 10% power with R62 on the ALC Board. Remove the output RF connector from J2 on tray and calibrate the reflected power to 10%, using R7, the Reflected Calibration pot, on the Output Detector Board.
  • Page 73 Innovator CHV400BTD ATSC Transmitter System Set Up Procedure R8, for a reading of 100% on the External Amplifier Forward Power screen of the LCD display mounted on the Driver Tray. R26 REFL CAL ADJ R8 FWD CAL ADJ Figure 18: (A5) Amplifier Control Board (1309822) On the ALC Board (1308570), mounted in the Driver Tray, set the Switch S1, Auto/Manual ALC, to the Auto position.

  • Page 74: Linearity Correction Adjustment (Non-Linear Distortions)

    Innovator CHV400BTD ATSC Transmitter System Set Up Procedure R126 Quad R117 In Phase #2 Threshold #2 Magnitude R69 Quad R110 In Phase #3 Threshold #2 Threshold R109 In Phase R128 Quad #1 Threshold #3 Magnitude R114 In Phase R129 Quad...

  • Page 75: Linearity Correction Adjustment (Linear Distortions)

    PC and then loaded into the Innovator CX through the serial interface. The instructions included with the PTC application software provide the detailed setup procedure. If a problem occurred during the set up, help can be found by calling Axcera field support at (724) 873-8100. Technical Manual, Rev. 0...
  • Page 76 Innovator CHV400BTD ATSC Transmitter System Set Up Procedure This page intentionally left blank. Technical Manual, Rev. 0...
  • Page 77 APPENDIX A Innovator, CHV400BTD ATSC Transmitter System Drawings...
  • Page 78 Drawings and Parts List Innovator CHV400BTD Transmitter System Drawing List CHV400BTD Innovator 400 Watt VHF High Band Digital Transmitter (Consists of a CHV20BTD Tray driving a CHV400B, 400W Amplifier Tray.) CHV400BTD Typical Block Diagram............1314095 CHV400BTD Typical Interconnect ............1314096...
  • Page 80 APPENDIX B Innovator, CHV20BTD, Driver Tray, Subassemblies and Boards Drawings...

  • Page 82: Chv20Btd

    Innovator CHV400BTD ATSC Transmitter Appendix B, CHV20BTD Tray, Subassemblies & Boards Drawings and Parts List Innovator CXB Series Transmitter CHV20BTD Driver Tray, Subassemblies & Boards Drawing List CHV20BTD Innovator 20 Watt Digital Transmitter (Used as a driver) CHV20BTD Block Diagram ..............1314130 CHV20BTD Interconnect ..............
  • Page 83 Innovator CHV400BTD ATSC Transmitter Appendix B, CHV20BTD Tray, Subassemblies & Boards Drawings and Parts List VHF HB Coupler Assembly (Mounted in 20W Driver Amplifier Assembly 1313959) Schematic..................1313858 VHF HB Pre-Driver Assembly (Mounted in 20W Driver Amplifier Assembly 1313959) Schematic..................1313900...
  • Page 84 APPENDIX C Innovator, CHV400B, Amplifier Tray, Subassemblies and Boards Drawings...

  • Page 86: Chv400B

    Innovator CHV400BTD ATSC Transmitter Appendix C, CHV400B Tray, Subassemblies & Boards Drawings and Parts List Innovator CXB Series Transmitter CHV400B Amplifier Tray, Subassemblies & Boards Drawing List CHV400B Innovator 400 Watt Digital Amplifier Tray CHV400B Block Diagram ..............1314132 CHV400B Interconnect ..............1313994 Current Metering Board Schematic....................
  • Page 87 Innovator CHV400BTD ATSC Transmitter Appendix C, CHV400B Tray, Subassemblies & Boards Drawings and Parts List Technical Manual, Rev. 0...

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