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Axcera CHV400BTD, Техническое руководство

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Innovator CHV400BTD ATSC Transmitter 

Board Descriptions 

 

Technical Manual, Rev. 0 

  60 

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 sw24/+42VDC to the (A6) Amplifier Assembly.  
In CHV20B trays the DC output of the (A10) power supply also connects to the (A11) fan 
mounted on the rear panel, which will operate when AC is applied to the tray, the On/Off 
circuit breaker is On and the (A10) power supply is operating. 
 

Circuit Description of External System Metering Board which is only used in 
Transmitters with multiple external Amplifier Trays 

 

(A5) System Metering Board (1312666) 

 
The function of the System Metering Board is to detect forward and reflected output power 
samples and generate output voltages that are proportional to the power levels of the 
sampled signals for use by the control monitoring assembly in the exciter/driver tray. 
 
There are two identical signal paths on the board: one for forward power and one for 
reflected power.  A sample of the forward output power, from the external (A11) output 
coupler, enters the board at the SMA jack J3.  The signal is filtered and connected to 
resistors R5, R3 and R6 that form an input impedance-matching network to Pin 3 on U1.  
The forward power signal is detected by the RF detector IC U1.  The detected output at 
pin 7 is split with one half connected to the forward average calibration pot R7, digital, 
which adjusts the level of the signal connected to Pin 11 on U2.  The other half of the split 
is connected to the peak calibration pot R18, analog, which adjusts the level of the signal 
connected to Pin 8 on U2.  U2 is a Bilateral Switch IC whose output, digital or analog, is 
controlled by the selection of the modulation type in the exciter/driver tray.  In this BTC 
transmitter the average, digital, output connects to the amplifier IC U3A that is wired to 
the SYS_FWD and RMT_FWD Power Metering Outputs.  A reading of 2 VDC measured at 
TP1 is equal to a 100% Forward Power reading on the meter.  The SYS_FWD level 
connects to J9 on the board that is cabled to J11 on the exciter/driver tray for use in the 
control monitoring assembly.  The RMT_FWD level connects to J10 on the board for use by 
remote control and monitoring. 
 
A sample of the reflected output power, from the external (A11) output coupler, enters 
the board at the SMA jack J8.  The signal is filtered and connected to resistors R26, R22 
and R27 that form an input impedance-matching network to Pin 3 on U6.  The reflected 
power signal is detected by the RF detector IC U6.  The detected output at pin 7 is 
connected to the reflected calibration pot R25, which adjusts the level of the signal 
connected to the amplifier IC U3B that is wired to the SYS_RFLD and RMT_RFLD Power 
Metering Outputs.  A reading of 2 VDC measured at TP2 is equal to a 25% Reflected 
Power reading on the meter.  The SYS_RFLD level connects to J9 on the board that is 
cabled to J11 on the exciter/driver tray for use in the control monitoring assembly.  The 
RMT_RFLD level connects to J10 on the board for use by remote control and monitoring. 
 
+12 VDC enters the board at J9-1, from the exciter/driver tray and is connected through a 
filter and isolation circuit consisting of C31, C14 and L5 before it is connected to the 
regulator IC U5.  U5 supplies the +5 VDC needed for operation of the ICs on the board.  
The +5 VDC is connected through a filter circuit consisting of C15, C19 and C21 before it 
is connected to the rest of the board. 
 

Содержание CHV400BTD

Страница 1: ...echnical 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 co...

Страница 2: ...on 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...

Страница 3: ...r Board 1308275 Only used with BRD operation 49 Overview 49 Microcontroller Functions 49 Jumper and DIP Switch Settings 49 A2 Digital Modulator Board 1304883 Part of the Digital Modulator 50 w Power C...

Страница 4: ...to S310 Converter Module 63 ASI Motherboard 1311179 63 ASI to 310 Conversion Board Non SFN 1311219 63 ASI to 310 Conversion Board SFN 1309764 64 System Set Up Procedure 65 Set Up of the LO1 and LO2 Sa...

Страница 5: ...connect between the trays racks and cabinets are labeled using markers Figure 1 is an example of a marked cable There may be as few as two or as many as four Markers on any one cable These markers ar...

Страница 6: ...notes warnings and cautions listed in this safety section and throughout the manual must be followed Follow Operating Instructions All of the operating and use instructions for the system should be fo...

Страница 7: ...ined from any Axcera Field Service Engineer by contacting the Axcera Field Service Department at 724 873 8100 or by Fax at 724 873 8105 This procedure applies to all items sent to the Field Service De...

Страница 8: ...nstallation negligence accident or unless authorized in writing by Axcera repair or alteration Axcera s exclusive liability for any personal and or property damage including direct consequential or in...

Страница 9: ...SYSTEM RADIO FREQUENCY RADIATION HAZARD MICROWAVE RF AMPLIFIERS AND TUBES GENERATE HAZARDOUS RF RADIATION THAT CAN CAUSE SEVERE INJURY INCLUDING CATARACTS WHICH CAN RESULT IN BLINDNESS SOME CARDIAC P...

Страница 10: ...ith one hand and push down on his forehead with the other This opens the airway Sometimes doing this will let the person breathe again by himself 3 If he is still not breathing begin rescue breathing...

Страница 11: ...TT 90 60 100 000 100 KILOWATTS 80 50 10 000 10 KILOWATTS 70 40 1 000 1 KILOWATT 60 30 100 1 HECTROWATT 50 20 50 47 17 20 43 13 10 1 DECAWATT 40 10 1 1 WATT 30 0 77 137 7 07V 0 1 1 DECIWATT 20 10 67 12...

Страница 12: ...8327 Canadian gallon fluid ounce fl oz milliliters ml 29 57353 British Thermal Unit watt W 0 2930711 per hour Btu hr horsepower hp watt W 746 NOMENCLATURE OF FREQUENCY BANDS FREQUENCY RANGE DESIGNATI...

Страница 13: ...Innovator CHV400BTD ATSC Transmitter Introduction Technical Manual Rev 0 9 RETURN LOSS VS VSWR 1 001 1 01 1 1 2 0 VSWR 0 10 20 30 40 50 60 70 R E T U R N L O S S dB...

Страница 14: ...Direct Current D A Digital to Analog DSP Digital Signal Processing DTV Digital Television dB Decibel dBm Decibel referenced to 1 milliwatt dBmV Decibel referenced to 1 millivolt dBw Decibel reference...

Страница 15: ...l packaging for safe storage Save all packing material for future use If equipment is ever removed from the site the original packaging will ensure its safe transport Figure 1 CHV1000BTD Front View Ty...

Страница 16: ...rmation included with your ATSC filter and low pass filter for specific dimensions Make sure that the space provided for the CX Series equipment is sufficient and includes the circulator splitters com...

Страница 17: ...t through AC power cords directly to the AC distribution box The AC power to the optional receiver tray and the exciter driver tray are connected through AC power cords that plug into the quad recepta...

Страница 18: ...nction Impedance J1 BNC Input A On Channel RF Input BRD 78 to 8 dBm or SMPTE 310 Input BTD 50 Ohms J4 BNC SMPTE 310 Output BRD Only Normally jumpered to J5 50 Ohms J5 BNC SMPTE 310 Input BRD Only Norm...

Страница 19: ...50 J2 7 16 1 1cm Din RF Output On Channel RF Output 50 J3 IEC AC Input AC input connection to 230VAC Source N A J4 9 Pos D Remote Amplifier Control Interface Connects to J11 on the exciter driver tray...

Страница 20: ...put of the driver tray is split and connected to J1 the N type connector RF input jack on the amplifier trays Check that the system power metering interface cable is connected from J11 the 9 position...

Страница 21: ...The Status LED showing a blinking Red LED indicates an Event Fault is occurring now The Status LED showing Amber indicates that an Event Fault occurred since the last time the Event Fault indications...

Страница 22: ...Pin Attenuator Voltage 1 Volt to 5 Volts Typical Operating Parameters for a CHV200 Parameter Typical Reading Forward Power 100 Reflected Power 5 Power Supply Voltage 42 Volts Heatsink Temperature 20 t...

Страница 23: ...ors and LCD display are Off Power supply A9 not operating NOTE A spare 10 Amp fuse is provided in the blank fuse holder under the active fuse If there is an Event Fault occurring in the system the Sta...

Страница 24: ...andby and Status Indicators LED FUNCTION OPERATE STANDBY Green Amber A Green LED indicates that the system is in Operate An Amber LED indicates that the system is in Standby STATUS Green Red Amber A G...

Страница 25: ...ystem Remote Signal Name Pin Designation Signal Type Description System Operate J12 1 Discrete Open Collector Input A pull down to ground on this line indicates that the System is to be placed into th...

Страница 26: ...ort Input Status J12 12 Discrete Open Collector Output Indicates if input to system is Normal or Not Low OK Floating Fault Status Report Fault Status J12 13 Discrete Open Collector Output Indicates if...

Страница 27: ...upon exit of the Set Up Menu NOTE An example of accessing and changing an item using the Set Up Menus is as follows This procedure is to set the Off Air Receive Channel to the desired channel Push and...

Страница 28: ...enu which is the Transmitter Details Main Menu Table 9 1 Transmitter Translator Event List Screen BTD BRD When events occur they will be displayed on this screen The Up and Down arrow will page you th...

Страница 29: ...r heatsink assembly mounted in the system or driver tray in degrees Fahrenheit If the temperature is below the trip point 194 F it will indicate OK If an overtemperature Event Fault occurs it will res...

Страница 30: ...8VSB Demodulator submenus or push the DOWN Arrow to view the next main menu which is the Device Details 8VSB Modulator Main Sub Menu Table 10 2 1 System Input Details Screen BRD This screen provides t...

Страница 31: ...e Lock Loop A Details Screen BTD BRD This menu indicates if the Phase Lock Loop A in the modulator is locked Table 10 3 3 Modulator Phase Lock Loop B Details Screen BTD BRD This menu indicates if the...

Страница 32: ...converter Phase Lock Loop 1 Details Screen BTD BRD This menu indicates if the Phase Lock Loop 1 in the upconverter is locked Table 10 5 2 Upconverter Phase Lock Loop 2 Details Screen BTD BRD This menu...

Страница 33: ...ernal Amplifier Device Details Screen BTD BRD This is the Transmitter Device Details External Amplifier Main Sub Screen This is the final Device Details Main Sub Menu Push the ENTER button to access t...

Страница 34: ...ble 10 7 7 External Amplifier 1 A Power Supply Details Screen BTD BRD Indicates the voltage of the A power supply in the external amplifier 1 NOTE Typical voltage value is 42VDC nominal Table 10 7 8 E...

Страница 35: ...iliar with the operation of the system Pressing the ENTER button will display the Enter Key Sets to Change screen Table 11B Enter Key Sets to Change Mode Screen BTD BRD This screen informs the operato...

Страница 36: ...hat the system by selecting ON will latch the input fault if it occurs then if the input returns the fault will still register Table 11 1 5 Chassis Values IF Processor Selection Screen BTD BRD This sc...

Страница 37: ...t mask of the Ethernet controller Table 11 1 13 Chassis Values Ethernet Gateway Set Up Screen BTD BRD When the optional Ethernet Controller module is present this screen is used to view or change the...

Страница 38: ...ontrols the operation of the linear equalizer When set to ON the modulator applies linear correction to the IF output When set to OFF no correction is applied to the IF Table 11 3 3 8VSB Modulator Non...

Страница 39: ...smitter is in standby Contact Axcera Field Service before using this menu To change the Channel the enter button must be pushed This will cause the Channel number to blink Pushing the Up or Down Arrow...

Страница 40: ...TSC Transmitter Initial On Site Turn On Procedure Technical Manual Rev 0 36 Table 11 5 1 Downconverter RF Input Level Screen This screen allows the operator to monitor the RF input level and to set th...

Страница 41: ...generative translator The type of A6 Amplifier Assembly used in the tray changes as the output power of the system changes The Amplifier Assembly 1313959 is used in CHV20B systems and the Amplifier As...

Страница 42: ...ovide the operating voltages through the current metering board to the two amplifier pallets If one power supply should malfunction the other power supply will maintain the necessary voltage to provid...

Страница 43: ...ner with reject load The reject loads in the multi amplifier systems have thermal switches connected to them which monitor the temperature of the load and provide the overtemperature fault if it occur...

Страница 44: ...Innovator CHV400BTD ATSC Transmitter System Description Technical Manual Rev 0 40 This page intentionally left blank...

Страница 45: ...remote computer This option may not be included in your system Figure 8 Typical Ethernet User Log In Screen Once a connection has been established the web interface can be launched by entering the IP...

Страница 46: ...be sure to not use special characters except underscores dashes and forward slashes If the item on screen is Orange which indicates latched fault the fault can be reset by pushing the Fault Reset but...

Страница 47: ...s 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...

Страница 48: ...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 def...

Страница 49: ...ck 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 Scr...

Страница 50: ...thernet 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 E...

Страница 51: ...t identifiers OID Each OID identifies a variable that can be read read and set or only set via SNMP commands SNMP functionality also provides for alert messages that are issued from the Ethernet Contr...

Страница 52: ...Innovator CHV400BTD ATSC Transmitter SNMP Ethernet Interface Description Technical Manual Rev 0 48 This page intentionally left blank...

Страница 53: ...LCD display via connector J24 and pushbutton interface on J27 On power up the microcontroller sets the tuner to the last channel that was selected when the unit was powered down In addition the micro...

Страница 54: ...values from the microcontroller U1 located on this board The output of the linear equalizer is then input to two pulse shaping filters an in phase I and a quadrature Q filter that are also located in...

Страница 55: ...SYS is filtered by L6 L7 C111 and C112 before it is applied to the rest of the board as 12VI and 12VQ The 12V SYS also connects through the resistor R81 to provide 5V EXT to the rest of the board and...

Страница 56: ...biasing and impedance matching circuits that makes it operate as a wide band IF amplifier The output of U1 connects through C8 NON LIN IN to the Summing Port input of the splitter Z3 The splitter pro...

Страница 57: ...eans of balancing the level of the Quad Phase pre distorted IF signal that connects to Port 2 on the combiner Z4 The Quadrature and In Phase pre distorted IF signals are combined by Z4 amplified by U1...

Страница 58: ...nput Fault and Modulation Fault Circuitry The input IF signal at Z1 Port 1 connects to the input and modulation fault circuitry at T2 T2 doubles the voltage swing by means of a 1 4 impedance transform...

Страница 59: ...ture compensation for the two diodes in each of the in phase and quadrature pre corrector stages J6 IF Input Mixer Mixer J7 RF Output 1 GHz TCXO Fract N PLL Integer N PLL Integer N PLL 10 MHz TCXO Ext...

Страница 60: ...illator is not locked Pin Attenuator J1 RF Input Input Loss Detector Auto Man Select ALC TP4 Mute from Control Circuit J2 RF Output TP1 Overdrive Detect Output Power Reflected Power Input Power Refere...

Страница 61: ...the voltage at the output of U8A the reflected power takes over the ALC circuit Once the U8B voltage drops below the forward power at U8A the forward power takes over again The VSWR shutdown circuit w...

Страница 62: ...de 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 ampl...

Страница 63: ...ut voltages to this board is connected through J21 and filtered before being connected to the rest of the board 12 VDC connects through J21 1 5VDC through J21 2 3 and 12 VDC through J21 6 Common conne...

Страница 64: ...s the level of the signal connected to Pin 8 on U2 U2 is a Bilateral Switch IC whose output digital or analog is controlled by the selection of the modulation type in the exciter driver tray In this B...

Страница 65: ...to identify which amplifier tray is which The rotary switch SW1 is used to specify the amplifier ID number which generates a unique serial address so that the individual amplifier trays will respond w...

Страница 66: ...6 2 Way Combiner Board 1313969 in CHV400B The 2 way combiner board takes the two RF Inputs at J4 J5 200Watts ATSC on the board and combines them to a single output 400Watts at J1 that connects to J2 t...

Страница 67: ...ion Board SFN 1309764 and a 120 VAC to 12 VDC converter module ASI Motherboard 1311179 The ASI motherboard takes the 12 VDC from the 120 VAC to 12 VDC converter module and converts it to 5 VDC and 3 3...

Страница 68: ...rts 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 This method ensu...

Страница 69: ...ir 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 Figure 14 A4 Digital Upconverter Board 1309695 Set Up of the LO1 and...

Страница 70: ...rector Board should be 1 0 VDC with 100 output power Refer to Figure 16 Check that the Auto Man switch S1 on the ALC Board is in the Automatic ALC position NOTE The silkscreen is incorrect on Rev A B...

Страница 71: ...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 C...

Страница 72: ...use the ALC Adjust pot R75 to decrease the power to 10 Remove the RF output connector from the tray Verify that the VSWR Cutback LED DS6 comes on and the Reflected Power drops to approximately 6 Reco...

Страница 73: ...Driver Tray adjust the ALC adjustment Pot R75 for a reading of 10 on the External Amplifier Forward Power screen of the LCD display mounted on the Driver Tray Disconnect the load or the antenna connec...

Страница 74: ...adjustments located on the IF Pre Corrector Board Each stage consists of a threshold and a magnitude stage The adjustments are adjusted as needed to correct for any amplitude or phase intermod proble...

Страница 75: ...ustment in the field However in the event that field adjustment of the digital linear precorrection is required Axcera does offer an optional Precorrector Tap Converter PTC application This applicatio...

Страница 76: ...Innovator CHV400BTD ATSC Transmitter System Set Up Procedure Technical Manual Rev 0 72 This page intentionally left blank...

Страница 77: ...APPENDIX A Innovator CHV400BTD ATSC Transmitter System Drawings...

Страница 78: ...nical Manual Rev 0 A 1 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 T...

Страница 79: ......

Страница 80: ...APPENDIX B Innovator CHV20BTD Driver Tray Subassemblies and Boards Drawings...

Страница 81: ......

Страница 82: ...1313984 Digital Modulator Board Part of the Digital Modulator w Power Conditioner 1309629 Schematic 1304884 ALC Board Schematic 1308571 IF Precorrector Board Schematic 1308797 Power Conditioner Board...

Страница 83: ...Pre Driver Assembly Mounted in 20W Driver Amplifier Assembly 1313959 Schematic 1313900 20 Watt Driver Amplifier Assembly Contains a VHF HB Pre Driver Assembly 1313899 a 100 Watt Amplifier Pallet Ital...

Страница 84: ...APPENDIX C Innovator CHV400B Amplifier Tray Subassemblies and Boards Drawings...

Страница 85: ......

Страница 86: ...ing List CHV400B Innovator 400 Watt Digital Amplifier Tray CHV400B Block Diagram 1314132 CHV400B Interconnect 1313994 Current Metering Board Schematic 1309131 Innovator CXB Amplifier Control Board Sch...

Страница 87: ...Innovator CHV400BTD ATSC Transmitter Appendix C CHV400B Tray Subassemblies Boards Drawings and Parts List Technical Manual Rev 0 C 2...

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