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.
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.
Innovator CHV400BTD ATSC Transmitter Table of Contents Table of Contents Introduction ......................................................................................................1 Manual Overview ............................................................................................1 Assembly Designators .....................................................................................1 Safety ...............................................................................................
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) ....................................................
Innovator CHV400BTD ATSC Transmitter 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. Appendix A of this manual contains the system level drawings and parts lists for the Innovator CHV400BTD ATSC Transmitter System.
Innovator CHV400BTD ATSC Transmitter Introduction Single Point Breaker or Disconnect - The customer should provide a single point breaker or disconnect at the breaker box for the main AC input connection to the transmitter. Transmitter Ratings - The transmitter ratings are provided in the text of this manual along with voltage and current values for the equipment. Protective Earthing Terminal – A main protective earthing terminal is provided for equipment required to have protective earthing.
Innovator CHV400BTD ATSC Transmitter Introduction Contact Information The Axcera Field Service Department can be contacted by PHONE at 724-873-8100 or by FAX at 724-873-8105. Before calling Axcera, please be prepared to supply the Axcera technician with answers to the following questions. This will save time and help ensure the most direct resolution to the problem. 1. 2. 3. 4.
Innovator CHV400BTD ATSC Transmitter Introduction Limited One Year Warranty for Axcera Products Axcera warrants each new product that it has manufactured and sold against defects in material and workmanship under normal use and service for a period of one (1) year from the date of shipment from Axcera's plant, when operated in accordance with Axcera's operating instructions. This warranty shall not apply to tubes, fuses, batteries, bulbs or LEDs.
Innovator CHV400BTD ATSC Transmitter Introduction WARNING!!! HIGH VOLTAGE DO NOT ATTEMPT TO REPAIR OR TROUBLESHOOT THIS EQUIPMENT UNLESS YOU ARE FAMILIAR WITH ITS OPERATION AND EXPERIENCED IN 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.
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. RESCUE BREATHING 1. Find out if the person is breathing. You must find out if the person has stopped breathing.
Innovator CHV400BTD ATSC Transmitter Introduction dBm, dBw, dBmV, dBµ µV, & VOLTAGE EXPRESSED IN WATTS 50 Ohm System WATTS 1,000,000,000,000 100,000,000,000 10,000,000,000 1,000,000,000 100,000,000 10,000,000 1,000,000 100,000 10,000 1,000 100 50 20 10 1 0.1 0.01 0.001 0.0001 0.00001 0.000001 0.0000001 0.00000001 0.000000001 0.0000000001 0.00000000001 0.
Innovator CHV400BTD ATSC Transmitter Introduction USEFUL CONVERSION FACTORS TO CONVERT FROM TO MULTIPLY BY mile (US statute) kilometer (km) inch (in) millimeter (mm) inch (in) centimeter (cm) inch (in) meter (m) foot (ft) meter (m) yard (yd) meter (m) mile per hour (mph) kilometer per hour(km/hr) mile per hour (mph) meter per second (m/s) pound (lb) kilogram (kg) gallon (gal) liter U.S. liquid (One U.S. gallon equals 0.
Innovator CHV400BTD ATSC Transmitter Introduction RETURN LOSS VS. VSWR 0 -10 -20 R E T U R N -30 dB L O S S -40 -50 -60 -70 1.001 1.01 1.1 VSWR Technical Manual, Rev. 0 9 2.
Innovator CHV400BTD ATSC Transmitter Introduction ABBREVIATIONS/ACRONYMS AC Alternating Current dBmV Decibel referenced to 1 millivolt AFC Automatic Frequency Control dBw Decibel referenced to 1 watt ALC Automatic Level Control FEC Forward Error Correction AM Amplitude Modulation FM Frequency Modulation AGC Automatic Gain Control FPGA Field Programmable Gate Array ARD A-line, Regenerative Translator, Digital Hz Hertz ATD A-line, Transmitter, Digital ICPM Incidental Carrier Phase
Innovator CHV400BTD ATSC Transmitter Unpacking and Installation Unpacking and Installation Unpacking Axcera certifies that upon leaving our facility all equipment was undamaged and in proper working order. It is imperative that all packages be inspected immediately upon arrival to verify that no damage occurred in transit to the site. Inspect all packages for exterior damage and make note of any dents, broken seals, or other indications of improper handling.
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” (40cm) high, which is 3 RU, 5.25” (13.3cm) for the driver and 6 RU, 10.5” (26.7cm) for the 400 watt Innovator CHVB Series amplifier tray. The CHV1000 systems are 15 RU, 26.
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. Connect the AC power cord supplied with the tray from J6 on the rear of the tray to the AC source.
Innovator CHV400BTD ATSC Transmitter CHV1000B CHV1500B CHV2000B CHV3000B 1000 1500 2000 3000 Watts Watts Watts Watts Unpacking and Installation 5100 Watts 7200 Watts 10000 Watts 14700 Watts 230 230 230 230 VAC VAC VAC VAC 22.2 31.3 43.5 63.
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.
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. There is a jumper installed from J4 to J5. To feed SMPTE-310 directly to the Modulator Board, remove the jumper and insert SMPTE-310 into J5.
Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Initial On Site Turn On Procedure After the Innovator CHVB Series tray or trays are installed and all input, output and AC connections are made, the system is ready for the initial on site turn on. Check that the output of the CHV200B tray is connected to an appropriate rated load or to the digital mask filter, low pass filter and the antenna for your system.
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 Pin Attenuator Voltage 1 Volt to 5 Volts Typical Operating Parameters for a CHV20 used as driver Parameter Typical Reading Forward Power 20-70% (Depending on output power level of system) Reflected Power <5%
Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Typical Problems, Indications and Causes in CHV200B Tray Problem Indication No power to tray Operate/Standby and Enable LED indicators and LCD display are Off No Output Signal Front Panel Status LED is Amber and blinking with no events, faults indicated. Loss of Input Signal Loss of Input on Modulator Menu Loss of Output Signal Amber Operate/Standby LED. Blinking Red Status LED. Cause AC power cord not connected.
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 LCD 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 & Enter.
Innovator CHV400BTD ATSC Transmitter STATUS (Green/Red/ Amber) JACK SAMPLE J6 Initial On Site Turn On Procedure A Green LED indicates that the system is functioning normally with no faults. A flashing Red LED indicates an Event (Fault) is occurring at this time. An Amber LED indicates an Event (Fault) occurred since the last time the Event (Fault) indications were reset but the system is now operating normally. FUNCTION Typical sample value is 65dB down from the output power level of the tray.
Innovator CHV400BTD ATSC Transmitter Remote Signal Name Pin Designation Set Channel (Set Up 1 or Set Up 2) J12-7 Ground J12-8 System Forward Power Level J12-9 System Aural Power Level J12-10 System Reflected Power Level J12-11 Report Input Status J12-12 Report Fault Status J12-13 Report Operate Status J12-14 Ground J12-15 Initial On Site Turn On Procedure Signal Type Discrete Open Collector Input. – Selects one of two possible Channel Setups of the system.
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. The final screen is the RF Power default screen which indicates the Forward Power and Reflected Power for the system.
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. Table 8: Transmitter/Translator RF Power Screen (BTD/BRD) This is the default screen that is displayed after the splash screens are displayed.
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. Table 10.1.
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. Table 10.1.9: ALC Voltage Level Details Screen (BTD/BRD) This menu indicates the Auto ALC voltage setting.
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. Table 10.3: Transmitter/Translator 8VSB Modulator Details Screen (BTD/BRD) This is the System Device Details 8VSB Modulator Main Sub Screen.
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.
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. Table 10.6.
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. Table 10.7.5: External Amplifier#1 I3-B1 Current Details Screen (BTD/BRD) Indicates Current of the B1 device in the external amplifier #1. NOTE: See the final test data sheet for the typical current value. Table 10.7.
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.
Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 11.1.2: Chassis Values Model Number Set Up Screen (BTD/BRD) This screen allows the set up of the Model Number of the transmitter/regenerative translator. 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.
Innovator CHV400BTD ATSC Transmitter Initial On Site Turn On Procedure Table 11.1.10: Chassis Values Reset Ethernet User Name Set Up Screen (BTD/BRD) When the optional Ethernet Controller is present, this screen is displayed. It is used to reset the username / 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.
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. NOTE: Refer to the description in Table 11B for how to change the values on the following set-up screens. Table 11.3.
Innovator CHV400BTD ATSC Transmitter Initial On Site 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. This will cause the channel type to blink.
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.
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. The DTV System (BTD) takes a SMPTE-310 Input and converts it to a DTV RF On Channel output signal.
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 Detector Board (1313747) which provides forward (2V=100%) and reflected (2V=25%) power samples to the CX Control Board (1312543) for metering and monitoring purposes.
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. The CHV2000B is made up of a driver tray, a three way splitter, three CHV750B amplifier trays and a three way combiner with reject load.
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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. This option may not be included in your system.
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.
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. A total of four external amplifier trays can be displayed. The color of the parameter indicates the status of that parameter.
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 – they must be entered manually on the setup computer). The setup computer has the following factory default settings. Refer to Figure 8 for a typical configuration screen.
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. Figure 13: Typical Account Management Screen when Add/Change selected Push the Back button to return to the control/monitoring screen.
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. After the selection has been made, the user needs to depress the right or left arrow and then the display will ask “PUSH ENTER TO ACCEPT CHANGES”.
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. The Innovator CHVB Ethernet Controller is available in a version that implements Simple Network Management Protocol (SNMP).
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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 SMPTE310M standard. The input to the assembly is at an “F” style connector on the shielded tuner and can be at a level of –8 to –78 dBm.
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).
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. The phase locked output of U37 is applied to an analog filter to remove harmonics of the pilot and then input to the quadrature splitter Z1. The outputs of Z1 are used as the inputs to the mixers in the analog output section.
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. The output at Port 1 connects to the input and modulation fault circuitry. The output at Port 2 connects to the pin-diode attenuator 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 unitygain amplifier U5B. The reference voltage is then connected to diode CR11 through choke L12.
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 pindiode attenuator circuit, CR1, CR2 & CR3. The high forward biases them more or less, that increases or decreases the IF level, therefore the output level. When the input signal level increases, the forward bias on the pin attenuator decreases, therefore the output power decreases, that maintains the output power as set by the customer.
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. ±12 VDC, +6.8 VDC, and VREF needed to operate the Board The ±12 VDC connects to the board at jack J7.
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. The Red LED DS4 will light if the PLL for the LO1 oscillator is not locked.
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. CR8, C33 and associated components control the ramp up speed of the manual gain circuit. CR9, C42 and their associated circuits do the same thing for the ALC circuit.
Innovator CHV400BTD ATSC Transmitter Board Descriptions through a directional coupler U6 to J2, the RF output jack of the board. The directional coupler provides an RF sample at J4 that is used by an external overdrive protection circuit located on the (A6-A3) ALC Board. The output of the pre-driver amplifier assembly at J2 connects to the RF Input connection on the (A6-A2) 100W Amplifier Pallet, Italmec.
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.
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.
Innovator CHV400BTD ATSC Transmitter Board Descriptions Circuit Descriptions of Boards in the CHV400, 400 Watt ATSC Amplifier Tray (A7) Amplifier Control Board (1312260) SW1 Amplifier Control Board The Amplifier Control Board is mounted in the top front facing the rear of the Amplifier Tray as shown above. The Amplifier Control Board uses a Programmable logic device, U12, to control the amplifier tray.
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. The two or four sensing circuits are identical therefore only one will be described. For the (A1) 878 amplifier pallet, the +42VDC from the (A8) switching power supply connects to TB2.
Innovator CHV400BTD ATSC Transmitter Board Descriptions connected to the tray and the CB1 and/or the CB2 circuit breakers are turned On. Either or both power supplies provides the +5VDC for use by the control board. The +42VDC needed by the amplifier modules on the heatsink assembly is generated by the (A8 & A9) power supplies in a 750 and 1000W amplifier trays. In a standard CHV400 amp tray there is only the (A8) power supply.
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. For SFN operation the ASI payload must be 19.392568 Mb/s ±2 ppm. A 38.785317 MHz VCXO locks to the exact S310 bit-rate using a Digital PLL.
Innovator CHV400BTD ATSC Transmitter System Set Up Procedure System Set Up Procedure This system was aligned at the factory and should not require additional adjustments to achieve normal operation. This Innovator CX Series system is of a tray design with multiple boards inside the tray. 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.
Innovator CHV400BTD ATSC Transmitter System Set Up Procedure S1 AUTO/MAN TP1 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. This is the normal operating position for the switch. The voltage at TP1 on the IF Pre-Corrector Board should be 1.0 VDC with 100% output power. Refer to Figure 16.
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. Refer to Figure 16. Locate (A5) the ALC Board (1308570), in the preset the Overdrive Threshold pot R38 full CW and set R62, Manual Adjust, and R75, ALC Adjust, full CCW.
Innovator CHV400BTD ATSC Transmitter System Set Up Procedure R75 ALC ADJ J4 R38 OVERDRIVE THRESHOLD S1 AUTO/MAN R62 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. Refer to Figure 17.
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.
Innovator CHV400BTD ATSC Transmitter System Set Up Procedure J14 W7 J13 W4 R126 Quad #2 Threshold R117 In Phase #2 Magnitude R69 Quad #3 Threshold R110 In Phase #2 Threshold R109 In Phase #1 Threshold R128 Quad #3 Magnitude R114 In Phase #1 Magnitude R129 Quad #2 Magnitude R24, R25 &R26 J4, J5 & J6 R125 Quad #1 Magnitude R67 Quad #1 Threshold Figure 20: (A3) IF Pre-Corrector Board (1308796) Linearity Correction Adjustment (Non-Linear Distortions) As shipped, the system was preset to include ampl
Innovator CHV400BTD ATSC Transmitter System Set Up Procedure There is also a frequency response correction network on the board consisting of R24-R26 and C14-C16. This has been factory set. Any adjustment of these controls will result in having to reload taps into the digital modulator (See the Linearity Correction Adjustment (Linear Distortions) section below).
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APPENDIX A Innovator, CHV400BTD ATSC Transmitter System Drawings
Innovator CHV400BTD ATSC Transmitter Appendix A, System 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 Technical Manual, Rev.
APPENDIX B Innovator, CHV20BTD, Driver Tray, Subassemblies and Boards Drawings
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 ...................................................................
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..........................................................................................
APPENDIX C Innovator, CHV400B, Amplifier Tray, Subassemblies and Boards Drawings
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............................
Innovator CHV400BTD ATSC Transmitter Technical Manual, Rev.