INSTRUCTION MANUAL INNOVATOR LX SERIES UHF Analog Driver/Transmitter AXCERA, LLC 103 FREEDOM DRIVE P.O. BOX 525 LAWRENCE, PA 15055-0525 USA (724) 873-8100 • FAX (724) 873-8105 www.axcera.com • info@axcera.
UHF Analog Driver/Transmitter Table of Contents TABLE OF CONTENTS SECTION CHAPTER 1 INTRODUCTION 1.1 1.2 1.3 1.4 1.5 1.6 PAGE Manual Overview...................................................................................1-1 Assembly Designation Numbers ..............................................................1-1 Safety ..................................................................................................1-1 Maintenance ................................................................
UHF Analog Driver/Transmitter Table of Contents TABLE OF CONTENTS - (Continued) SECTION PAGE 4.5 Power Amplifier Module Assembly used in 10-100 Watt transmitters......... 4-21 4.5.1 1-Watt Amplifier Module Assembly ............................................... 4-21 4.5.2 1-Watt UHF Amplifier Board ........................................................ 4-21 4.5.3 40-Watt UHF Amplifier Assembly ................................................. 4-21 4.5.4 UHF Module Assembly, RF Module Pallet ...........
UHF Analog Driver/Transmitter Table of Contents LIST OF FIGURES FIGURE PAGE 3-1 3-2 3-3 1 kW Minimum Ventilation Configuration ..........................................3-4 Front and Rear View Reconnection Drawing ......................................3-5 Rear View of LX Series Digital Transmitter ........................................3-6 4-1 4-2 4-3 40-Watt UHF Amplifier Module....................................................... 4-22 UHF Amplifier Module, 250 Watts..............................
UHF Analog Driver/Transmitter Table of Contents LIST OF TABLES TABLE 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 2-13 2-14 2-15 2-16 2-17 2-18 2-19 2-20 2-21 2-22 2-23 2-24 PAGE 10-100W Analog LX Series Assemblies and Tray................................2-1 Modulator Front Panel Switch ..........................................................2-2 Modulator Front Panel Status Indicators............................................2-2 Modulator Front Panel Control Adjustments.........................
UHF Analog Driver/Transmitter Chapter 1, Introduction Chapter 1 Introduction This manual explains the installation, setup, alignment, and maintenance procedures for the Innovator LX Series UHF analog modular driver/transmitter. It is important that you read all of the instructions, especially the safety information in this chapter, before you begin to install or operate the unit. relevant appendix that contains the drawings for that item. 1.
UHF Analog Driver/Transmitter Chapter 1, Introduction ventilation. To ensure the reliable operation of the driver/transmitter, and to protect the unit from overheating, these openings must not be blocked. used, but do not saturate the components. The fans and heatsinks should be cleaned of all dust or dirt to permit the free flow of air for cooling purposes. Servicing – Do not attempt to service this product yourself until becoming familiar with the equipment.
UHF Analog Driver/Transmitter Chapter 1, Introduction information and a brief description of why the unit is being returned. buyer (transportation and insurance prepaid), and (c) Axcera determines, in its sole judgment, that the product is defective and not subject to any misuse, neglect, improper installation, negligence, accident, or (unless authorized in writing by Axcera) repair or alteration.
UHF Analog Driver/Transmitter Chapter 1, 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.
UHF Analog Driver/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. RESCUE BREATHING 1. Find out if the person is breathing. You must find out if the person has stopped breathing.
UHF Analog Driver/Transmitter Chapter 1, Introduction Note: Because of possible FCC assigned offset, check for the assigned Carrier Frequency as written on License. UHF Channels NTSC Standard IF, 45.75 MHz L.O. (MHz) Visual Carrier Frequency (MHz) Crystal Frequency (MHz) Channel Nominal Minus Plus Nominal Nominal Minus Plus 14 471.25 471.24 471.26 517.00 64.625 64.62375 64.62625 15 477.25 477.24 477.26 523.00 65.375 65.37375 65.37625 16 483.25 483.24 483.26 529.00 66.
UHF Analog Driver/Transmitter Chapter 1, Introduction Note: Because of possible FCC assigned offset, check for the assigned Carrier Frequency as written on License. UHF Channels NTSC Standard IF, 45.75 MHz L.O. (MHz) Visual Carrier Frequency (MHz) Crystal Frequency (MHz) Channel Nominal Minus Plus Nominal Nominal Minus Plus 44 651.25 651.24 651.26 697.00 87.125 87.12375 87.12625 45 657.25 657.24 657.26 703.00 87.875 87.87375 87.87625 46 663.25 663.24 663.26 709.00 88.
UHF Analog Driver/Transmitter Note: Chapter 1, Introduction Because of possible FCC assigned offset, check for the assigned Carrier Frequency as written on License. UHF Frequency Assignments Channel Number Bandwidth (MHz) Video (MHz) Color (MHz) Audio (MHz) 14 470-476 471.25 474.83 475.75 15 476-482 477.25 480.83 481.75 16 482-488 483.25 486.83 487.75 17 488-494 489.25 492.83 493.75 18 494-500 495.25 498.83 499.75 19 500-506 501.25 504.83 505.75 20 506-512 507.
UHF Analog Driver/Transmitter Note: Chapter 1, Introduction Because of possible FCC assigned offset, check for the assigned Carrier Frequency as written on License. UHF Frequency Assignments Channel Number Bandwidth (MHz) Video (MHz) Color (MHz) Audio (MHz) 44 650-656 651.25 654.83 655.75 45 656-662 657.25 660.83 661.75 46 662-668 663.25 666.83 667.75 47 668-674 669.25 672.83 673.75 48 674-680 675.25 678.83 679.75 49 680-686 681.25 684.83 685.75 50 686-692 687.
UHF Analog Driver/Transmitter Chapter 1, 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.
UHF Analog Driver/Transmitter Chapter 1, 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.
UHF Analog Driver/Transmitter Chapter 1, Introduction ABBREVIATIONS/ACRONYMS AC Alternating Current PCB Printed circuit board AFC Automatic Frequency Control QAM Quadrature Amplitude Modulation ALC Automatic Level Control AM Amplitude modulation AGC Automatic Gain Control AWG American wire gauge BER Bit Error Rate BW Bandwidth DC Direct Current D/A Digital to analog dB Decibel dBm Decibel referenced to 1 milliwatt dBmV Decibel referenced to 1 millivolt dBw Decibel referenced
UHF Analog Driver/Transmitter Chapter 1, Introduction RETURN LOSS VS. VSWR 0 -10 -20 R E -30 T U R N dB L O S S -40 -50 -60 -70 1.001 1.01 1.1 VSWR LX Series, Rev. 0 1-13 2.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Chapter 2 System Description & Remote Control Connections The analog transmitters in the Innovator LX Series are complete 10W to 100W UHF Analog internally diplexed modular television transmitters that operate at a nominal visual output power of 10 to 100 watts peak sync and an average aural output power of 1 to 10 watts, at an A/V ratio of 10 dB, 10% sound, or .5 to 5 watts at 13 dB, 5% sound.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections The (A2) Modulator Assembly contains the Modulator Board (1301797). The modulator is broadcast quality and 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. The IF oscillator is oven controlled and locked to a 10 MHz reference for stability. The IF signal is fed through a SAW filter for precise sideband shaping.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.1.2 (A3) IF Processor Module Assembly (1301938; Appendix B) System output power control. Through the front panel display or a remote interface, an operator can set the transmitter's RF output power. The range of RF power adjustment is between 0% (full off) and 105% (full power plus). A front panel IF Processor module potentiometer sets the upper limit of RF power at 120%.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections the transmitter or in Manual mode the transmitter will continue to operate at 25% output. reported on the Control Monitoring board. When the IF Processor board detects an Input Signal fault it automatically Mutes the transmitter. The system controller does not Mute on an IF Processor Input fault. The IF Processor module Input Signal level is monitored.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.1.3 (A5) LO/Upconverter Module Assembly (1301930; Appendix B) driver threshold is set by a front panel Upconverter module potentiometer. When an over-drive condition is detected, the Upconverter module reduces its RF output level. For values less than 0.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections sent to the backplane on two ports. One port is sent to the Modulator module, if present, and the other is routed to a BNC connector (J11) on the backplane for a system 10 MHz output signal. is set to the desired LO frequency in kHz / 5 kHz. The maximum LO frequency setting with these parameters is 1310.715 MHz.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections The (A4) Control & Monitoring/Power Supply Assembly is configured at the factory for operation at 110 VAC or 220 VAC. The assembly made up of a Control Board (1302021), a Power Protection Board (1302837) and a Switch Board (1527-1406). The Assembly also contains a switching power supply that provides ±12 VDC to the rest of the modules in the chassis and +32 VDC to the Power Amplifier module. 2.1.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.1.5 (A6) Power Amplifier Module Assembly, Exciter, 100W Transmitter (1301923; Appendix B) connector of the Control & Monitoring/Power Supply module. The 100 Watt Transmitter/Exciter Driver Power Amplifier module and any External Amplifier modules contain the same control and monitoring board.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections of control board switch SW1 must be set on to route these lines as the system's RF power signals. In systems of output power greater than 50 Watts digital or 100 Watts analog, system power is monitored by an external module that is connected to TB31 and control board SW1 switches must be set off. Amplifier module is routed to the Upconverter module as AGC #1.
UHF Analog Driver/Transmitter Assembly (1301949), an Amplifier Control Board (1301962), a 1 Watt Module Assembly (1302891) and a TFS 40W UHF Module (1206693). The Driver Power Amplifier Module contains Broadband LDMOS amplifiers that cover the entire UHF band with no tuning required. They amplify the RF to the power level, 7 Watts Peak of Sync is maximum, that is needed to drive the external amplifiers to the output power level of the transmitter.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Table 2-20. Driver Amplifier Status Indicator LED ENABLED (Green) DC OK (Green) TEMP (Green) MOD OK (Green) FUNCTION When lit Green, it indicates that the PA is in the Operate Mode. If a Mute occurs, the PA will remain Enabled, until the input signal is returned. When lit Green, it indicates that the fuse protected DC inputs to the PA module are OK.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Processor will be enabled, the mute indicator on the front panel will be extinguished. The +32 VDC stage of the Power Supply in the Control & Monitoring Module is enabled, the operate indicator on the front panel is lit and the DC OK on the front panel should also be green. The enable and DC OK indicators on the PA Module will also be green. the output, the transmitter will not be in mute.
UHF Analog Driver/Transmitter • Chapter 2, System Description & Remote Control Connections • Power Amplifier Interlock is high indicating that the amplifier is not installed. Receipt of a “Standby CMD” over the serial interface. Operating Frequency Standby Mode The LX Series transmitter controller is designed to operate on UHF frequencies. The exact output frequency of the transmitter can be set to one of the standard UHF frequencies, or it can be set to a custom frequency using software set-up menus.
UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.4 Customer Remote Connections The remote monitoring and operation of the transmitter is provided through jacks TB30 and TB31 located on the rear of the chassis assembly. If remote connections are made to the transmitter, they must be made through plugs TB30 and TB31 at positions noted on the transmitter interconnect drawing and Table 2-20.
UHF Analog Driver/Transmitter Signal Name Pin Designations RMT Transmitter Stand-By TB30-7 RMT Power Raise TB30-8 RMT Power Lower TB30-9 RMT System Reflect Power TB30-10 RMT System Visual/Forward Power TB30-11 RMT System Aural Power TB30-12 RMT Spare 1 RMT Spare 2 TB30-13 TB30-14 System Reflect Power TB31-13 System Visual / Forward Power TB31-14 System Aural Power TB31-15 IF Processor IF Signal Select TB31-3 IF Processor DLC Voltage TB31-4 UC AGC #2 Voltage TB31-5 RMT Ground RMT
UHF Analog Driver/Transmitter Signal Name RMT +12 VDC RMT -12 VDC LX Series, Rev.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Chapter 3 Site Considerations, Installation and Setup Procedures There are special considerations that need to be taken into account before the Innovator LX Series analog driver/transmitter can be installed. For example, if the installation is completed during cool weather, a heat-related problem may not surface for many months, suddenly appearing during the heat of summer.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures sources of heat, such as personnel, and all should be taken into account. Now that the amount of heat that must be removed is known, the next step is to determine how to accomplish this. The options are air conditioning, ventilation, or a combination of the two. Air conditioning is always the preferred method and is the only way to create anything close to an ideal environment.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures higher than four feet above the floor. The inlet must be located where dirt, leaves, snow, etc., will not be carried in with the cooling air. 5. The exhaust should be located as high as possible. Some ducting is usually required to insure the complete flushing of heated air with no stagnant areas. 6.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures always good practice to consult the manufacturer when questions arise. Axcera can be contacted at (724) 8738100. Figure 3-1. 1 kW Minimum Ventilation Configuration 3.2 Unpacking the Chassis w/modules, bandpass and trap filters The modules are mounted to the chassis assembly with slides that are on the top and the bottom of the modules.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures NOTE: To pull out the power amplifier module for replacement purposes, the input and output coaxial cables must first be removed from the rear of the chassis assembly. Connect the bandpass filter and trap filter to the output of the chassis assembly. Figure 3-2. Front and Rear View Reconnection Drawing Connect the transmission line for the antenna system to the output of the trap filter.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Figure 3-3: Rear View of LX Series Analog Transmitter J25 J21 TB02 TB30 J18 TB31 J9 J6 J24 J11 J4 J8 J23 J19 J32 J5 J34 Table 3-1: Rear Chassis Connections for the LX Series Analog Transmitter.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures 3.5.2 Front Panel Screens for the Exciter/Amplifier Chassis Assembly characters are special characters used to navigate up or down through the menu screens. Display text flashes on discrete fault conditions for all screens that display a fault condition.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-5: Menu 11 - Error List Access Screen S Y S T E E R ↑ R O R M L E R R O I S E T N T ↓ R S D I 6 S P L A Y S T B This screen of the transmitter shows the current number of errors and provides operator access to view the error list. This is the entry point to Menu 20. If ENT is pushed, go to Menu 20. If the ↓ key is activated the system changes to Menu 12, go to Menu 12.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-9: Menu 30 - Transmitter Device Details Screen S X P Y S T M T R O W E ↑ E R M I N S ↓ D U E O P T P P A E L I R Y L A : S T E O M O D E E S C K This screen of the transmitter allows access to the transmitter parameters of installed devices. The system is configured to know which devices are present. Current values for all installed devices are shown.
UHF Analog Driver/Transmitter System Component Chapter 3, Site Considerations, Installation and Setup Procedures Parameter Ext. Power Amplifier Modules Details (Only in high power systems) Normal Faulted (Blinking) FORWARD POWER REFLECTED POWER AMP 1 CURRENT AMP 2 CURRENT TEMPERATURE CODE VERSION xxx% xxx% xx.xA xx.xA xxC x.x xxx% xxx% xx.xA xx.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-14: Menu 40-2 - Transmitter Set-up: Frequency Select Screen T 0 R 3 A N F T S R A ↑ M I E Q B L ↓ T U E T E ( E N O + R C R ) S Y C E E S U S T E S C L T U P E C T O M ( - ) This screen of the transmitter is allows access to transmitter frequency set-up parameters. The choices of this screen are 'TABLE' or 'CUSTOM'.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-18: Menu 40-6 - Transmitter Set-up: Serial Address Screen T 0 R 4 A N S S E ↑ M I R I T A ↓ T L E R A ( + ) D S D E R T E E S C S U S P 5 ( - ) This screen allows the user to set the serial address of the transmitter. The default address is 5. This value and all other set-up parameters, are stored in non-volatile memory.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-22: Menu 40-10 - Transmitter Set-up: System Reflected Power Calibration T 0 R 6 A N S R S Y E ↑ M I S T F L ↓ T E E T E R M C C T ( + ) A P S L W E E I R S T B R X U A . C P T X ( E % - ) This screen is used to adjust the calibration of the system's reflected power.
UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures output sets a linear circuit voltage that is controlling a non-linear power circuit. VIDEO LOSS: This indicates the loss of Video to the modulator, when Red. If a problem occurred during the setup and operation procedures, refer to Chapter 5, Detailed Alignment Procedures, of this manual for more information. OVER MOD: This illuminates Red when the video is overmodulated.
UHF Analog Driver/Transmitter DC OK - This illuminates Green when the DC outputs that connect to the modules in the transmitter are present. Chapter 3, Site Considerations, Installation and Setup Procedures DC OK - This illuminates Green when the DC inputs to the PA module are present. POWER AMPLIFIER OR DRIVER MODULE LEDs ON FRONT PANEL TEMP - This illuminates Green when the temperature of the heatsink in the PA is below 78°C. NOTE: Both the PA Module and Driver Module have the same front panel LEDs.
UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions Chapter 4 Circuit Descriptions 4.1 (A2) Modulator Module (1301929; Appendix B) determined by the setting of the MONO, balanced audio gain pot R110, accessed through the front panel. The output of the amplifier stage is wired to the summing point at U13C, pin 9. NOTE: Not used in a translator system. 4.1.1 Analog Modulator Board (1301797; Appendix B) 4.1.1.
UHF Analog Driver/Transmitter amplifier U13D. The amplified signal is then applied though the SAP/PRO, SCA gain pot R150, accessed through the front panel, to the summing point at pin 9 of U13C. 4.1.1.4 Audio Modulation of the 4.5 MHz VCO The Mono balanced audio, or the Stereo composite audio, or the SAP/PRO SCA buffered audio signal, is fed to the common junction of resistors R111, R130, and R152 that connect to pin 9 of amplifier U13C. The output audio signal at pin 8 of U13C is typically .
UHF Analog Driver/Transmitter frequency. The visual IF signal and the aural IF signal are then combined in the diplexer circuit to produce the visual IF + aural IF output, “G”, that is connected to J41C pin 28C the Combined IF output of the board. 4.1.1.6 Main Video Signal Path (Part 1 of 2) The baseband video input connects to the board at J41A pins 19A (-), “W”, and 20A (+), “V”.
UHF Analog Driver/Transmitter of sync auto clamp circuit will not automatically be clamped to the pre set level. 4.1.1.9 Main Video Signal Path (Part 2 of 2) A sample of the clamped video output from the group delay circuitry at the junction of R44, R62 and R300 is connected to a white clipper circuit consisting of Q1 and associated circuitry. The base voltage of Q1 is set by the voltage divider network consisting of R1, R9 and R5.
UHF Analog Driver/Transmitter through C152 to the amplifier U23A. The output of U23A is split with one part connecting to Q26 that shuts down the 45.75 MHz oscillator. Another path connects to Q25 the conducts and lights the LED DS7, Alternate IF, viewed on the front panel. The final path connects through R268 to Q22 that is biased on and energizes the relay, K2. The external IF CW Input at contact 14 now connects through the closed contact to the splitter network consisting of L31 and L32.
UHF Analog Driver/Transmitter matching network consisting of T3 and T4. One part of signal connects to J10, the 41.25 MHz + 45.75 MHz sample output jack, located on the front panel. The other part, “G”, connects to J41C pin 28C the Combined IF Output of the board. 4.1.1.14 Voltage Requirements The ±12 VDC needed for the operation of the board enters through jack J41A pins 25A (+12 VDC) and 26A (-12 VDC). The +12 VDC is filtered by L6, L7, and C27 before it is connected to the rest of the board.
UHF Analog Driver/Transmitter the tray is in a high RF environment. (If this is the case, the transmitter will have to be serviced with the tray cover off in spite of the presence of other RF signals). The filtered IF signal is fed through a pitype matching pad consisting of R2, R3, and R4 to the pin-diode attenuator circuit consisting of CR1, CR2, and CR3. 4.2.1.4 Input Level Detector Circuit The other part of the split IF input is connected through L2 and C44 to U7.
UHF Analog Driver/Transmitter path is then established from the +12 VDC line through Q5, the resistors R69 and R137, and the red LED DS3, input loss indicator, which is illuminated. When Q5 is on, it applies a high to the gate of Q6. This causes it to conduct and apply a modulation loss pull-down output to J42C, pin 7C, which is applied to the front panel display on the Control/Monitor module. The other low output of U9C and U9D is connected through CR18, CR19 & CR20 to jack J5.
UHF Analog Driver/Transmitter matching circuits that makes it operate as a wide-band IF amplifier. The output of U1 connects to J40 that is jumpered to J41. The J40 jack is available, as a sample of the pre-correction IF for troubleshooting purposes and system setup. The IF signal is connector to a splitter Z1 that has an in phase output and a 90° Quadrature output, which are then connected to the linearity corrector portion of the board. 4.2.1.
UHF Analog Driver/Transmitter The amplitude and phase pre-distorted IF signals are combined by Z2 and connected to J37 that is jumpered to J36 on the board. J37 can be used for testing or monitoring purposes of the IF signal after amplitude and phase predistortion. The pre-distorted IF signal connects through a resistor buffer network that prevents loading of the combiner before it is wired to the frequency response circuitry. 4.2.1.
UHF Analog Driver/Transmitter increasing its gain maintaining the same output power level. The ALC action starts with the ALC detector level monitored at TP4. The detector output at TP4 is nominally +.8 VDC and is applied through resistor R77 to a summing point at op-amp U10A, pin 2. The current available from the ALC detector is offset, or complemented, by current taken away from the summing junction. In normal operation, U10A, pin 2, is at 0 VDC when the loop is satisfied.
UHF Analog Driver/Transmitter that is converted to a bias voltage that connects to the VCO. This voltage adjusts the output frequency of the VCO until it is on the desired frequency. The Phase lock loop is programmed by loading in data generated by the control module. This data sets the dividers so that the 10MHz and the VCXO frequency are divided to 5kHz. These divide numbers are loaded into U6 using the clock, data and LE lines.
UHF Analog Driver/Transmitter then fed to the SMA RF output jack of the board at J3. Typical output level of the signal is +16 dBm nominal. This output connects through A5 a channel filter to the LO/Upconverter Board. The DC voltages needed to operate the UHF generator board are supplied by the LO/Upconverter Board. The +12 VDC for the board enters through jack J4-3 and is filtered by L22 and C54-C58 before being distributed to the circuits on the board.
UHF Analog Driver/Transmitter appear as a good 50-Ω load at all frequencies. The pad, in the output line of the board, consisting of R20, R18, and R21 buffers the bad effects of the reactive filter load and makes it appear as a 50Ω impedance. The RF input signal from the external filter re-enters the board at J6 (-11 to 17 dBm) and is capacitively coupled to the pin-diode attenuator circuit consisting of CR2, CR3, and CR4.
UHF Analog Driver/Transmitter The RF then enters a coupler stage, which provides a sample of the RF at J7 (–20dB), the front panel RF sample jack. The main path through coupler is to J43 pin 25B, the Upconverter RF output jack of the module (+0 to +10 dBm).
UHF Analog Driver/Transmitter With no external 10-MHz reference input, the level connected to U7A Pin 2 will be low. This will be less than the reference set by R46 and R48, which is connected to pin 3 of U7A, that causes the output of U7A to go high. The high connects to the gates of Q3, Q5 and Q6, which are biased on and causes their drains to go low. The low from the drain of Q6 is wired to J43, pin 14A, for connection to a remote external 10-MHz present indicator.
UHF Analog Driver/Transmitter jack J43 pin 15A, the PLL Lock Indicator output of the board. Voltage Requirements The board is powered by ±12 VDC that is produced by an external power supply. +12 VDC enters the board through J43 pins 18A, B & C, and is filtered and isolated by L5, L6 and the shunt capacitor C24. The +12 VDC is then applied to the rest of the board and to J14 pin 3 for use by the UHF Generator Board. One connection of the +12 VDC is to IC U12.
UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions The polyswitch resettable fuses may open on a current as low as 2.43 Amps at 50ûC, 3 Amps at 25ûC or 3.3 Amps at 0ûC. They definitely will open when the current is 4.86 Amps at 50ûC, 6 Amps at 25ûC or 6.6 Amps at 0ûC. The connections from J62 and J63 of the Power Protection Board are wired to J62 and J63 on the Control Board.
UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions U3 and U4 are used to selectively enable various input and output ICs found on pages 2 & 3 of the schematic. turn on threshold of the FET (about 2 VDC), a logic high is applied to the digital input buffer, U9. U1 has two serial ports available. In this application, one port is used to communicate with transmitter system components where U1 is the master of a RS-485 serial bus.
UHF Analog Driver/Transmitter Power Protection Board. The ±12 VDC generated by the switching power supply connects to J62 and J63 after being fuse protected on the Power Protection Board. Schematic Page 5 There are three dual element, red/green, common cathode LED indicators mounted on the front panel of the sled assembly; DC OK, Operate and Fault. There are three, the fourth is a spare, identical circuits that drive the front panel mounted LED indicators.
UHF Analog Driver/Transmitter power supply at V1-6 & 7. The power supply is configured for three output voltages +12V, -12V, at the 8 position terminal block, and a main output power of +32 VDC at J50 pin A (+) and J50 pin B (Rtn). The power supply is power factor corrected to .98 for optimum efficiency and decrease in energy consumption. For safety purposes all outputs are over voltage and over current protected.
UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions deliver an output power of 40 watts (CW) with approximately 14 dB of gain. of potentiometers R807 and R808. The settings are factory implemented and should not be altered. The amplification circuit consists of LDMOS transistors V804 and V805 connected in parallel and operating in class AB. The paralleling network is achieved with the aid of 3 dB couplers Z802 and Z803.
UHF Analog Driver/Transmitter 4.5.5 (A4) Coupler Board Assembly (1301949; Appendix B) The UHF coupler board assembly provides a forward and reflected power samples of the output to (A5) the amplifier control board where it connects to the input of the overdrive-protection circuit. The RF input to the UHF coupler assembly, from the 250 Watt UHF amplifier module, connects to SMA jack J1. The RF is connected by a stripline track to the SMA type connector RF Output jack J2.
UHF Analog Driver/Transmitter than or equal to 1%. 100mA of current is available from each device but again the controller will not need this much current. In the upper left section are circuits with U12 and U13. U12 is used to generate a regulated voltage that is about 5 volts less than the +32 VDC supply, approximately +26.25 VDC. When the +32 VDC supply is enabled, the circuitry around U13B is used to provide gate voltage to Q10 that is 5 volts greater than the source pin of this FET.
UHF Analog Driver/Transmitter circuit. The detected level is connected to L4 that is part of an intercarrier notch filter circuit that is tuned to eliminate the 4.5 MHz aural intercarrier, if present. The Average power sample is amplified by U26D and connected through the average calibration pot R166 to U26C. The output of U26C is connected to the comparator IC U26B that has Aural Null and Offset Null, if present in the system, connected to the other input.
UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions 4.6.2 (A1-A1) 1-Watt UHF Amplifier Board (1302761; Appendix B) amplifier assembly (Figure 4-1). The assembly is made up of a (51-5378-30800) module, which operates class AB and is a highly linear broadband amplifier for the frequency range of 470 to 860 MHz. It can deliver an output power of 40 watts (CW) with approximately 14 dB of gain. It is set as needed to provide the drive level to the external PA Assemblies.
UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions board where it connects to the input of the overdrive-protection circuit. analog switch U1. PA7 is connected to a via, V10, for future access. The RF input to the UHF coupler assembly, from the 40 Watt UHF amplifier module, connects to SMA jack J1. The RF is connected by a stripline track to the SMA type connector RF Output jack J2.
UHF Analog Driver/Transmitter regulated voltage that is about 5 volts less than the +32 VDC supply, approximately +26.25 VDC. When the +32 VDC supply is enabled, the circuitry around U13B is used to provide gate voltage to Q10 that is 5 volts greater than the source pin of this FET. The gate of Q10 can be turned Off by any one of a few different circuits. U10A is used to turn Off the gate of Q10 in the event of high current in amplifier #1. At 0.
UHF Analog Driver/Transmitter of U26C is connected to the comparator IC U26B that has Aural Null and Offset Null, if present in the system, connected to the other input. The output Average Forward power level connects to J9 pin 2 of the board. A Reflected Power Sample enters the board at SMA Jack J5 and is detected by CR20 and the DC level amplified by U28B. The output of U28B at pin 7 is connected through the reflected calibration pot R163 to U28C.
UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures Chapter 5 Detailed Alignment Procedures This transmitter was aligned at the factory and should not require additional adjustments to achieve normal operation. After removal of the failed module, slide the replacement module in place and make certain it connects to the backplane board. If the replacement module is a PA Module replace the two cables on the rear of the exciter/amplifier chassis assembly.
UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures 5.2 LX Series Exciter/Amplifier Chassis Assembly following details the meaning of each LED: This transmitter operates using the baseband audio and video inputs or, if the (optional) 4.5-MHz composite input kit is purchased, either a single composite video + 4.5-MHz input or separate baseband video and audio inputs. AURAL UNLOCK (DS5) – Red Indicates that 4.5 MHz Aural IF is unlocked from the Nominal 45.75 MHz visual IF.
UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures MONO SET UP: The modulator was factory set for a ±25-kHz deviation with a mono, balanced, audio input of +10 dBm. If the reading is not at the correct level, adjust the MONO Audio Gain pot R110, located on the front panel of the modulator, as necessary, to attain the ±25-kHz deviation on the front panel screen. • DS4 (Mute) – Indicates that a Mute command is present to the system. Switch the transmitter to Standby.
UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures Module. The adjustments are threshold settings that are adjusted as needed to correct for any amplitude or phase intermod problems. Adjust the top linearity correction adjustment R211 threshold cut in for the in phase amplitude distortion pre-correction that is needed. Next adjust the middle linearity correction adjustment R216 threshold cut in also for the in phase amplitude distortion pre-correction that is needed.
UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures Control board, for 0% visual output. Perform the following adjustments with no aural present by removing the aural IF carrier jumper on the back of the chassis assembly. Connect a sync and black test signal to the video input jack of the test modulator. Switch the transmitter to Operate. R163 on the power amplifier module to a 10% reading. A reflected power fault should be present on the LCD Display.
UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures the Outer Sleeve and the Center Rod of the Notch can be adjusted to tune the Notch Frequency. The Depth of the Notch is set by the gap between the Center Conductor of the Trap Section and the Center Conductor of the Main Line. Tight Coupling makes a Deep Notch, while Loose Coupling makes a Shallow Notch. Center Conductor with an Allen Wrench and move it Deeper for a Lower Frequency Notch or out for a Higher Frequency Notch.
APPENDIX A LX SERIES ANALOG SYSTEM SPECIFICATIONS
Innovator LX (Preliminary) Low Power Transmitter 10W-6kW Designed to provide broadcasters with a product that will meet their needs like no other solution on the market, this new low to medium power transmitter line uses the latest LDMOS devices for broadband operation across the entire UHF band. This allows users to minimize spare parts stock, which is especially important to group owners and networks, and also enables simple and inexpensive channel changes.
Innovator LX (Preliminary) Low Power Transmitter 10W - 6kW Visual Performance Visual Performance (continued) Frequency Range 470 to 806 MHz Carrier Stability (Transmitters) Standard ±1 kHz Optional ±350 Hz w/PFC ±1Hz Frequency Translation Stability (Translators) Standard ±1 kHz Optional ±350 Hz w/PFC ±1Hz Regulation of RF Output Power 3% Output Variation (Over 1 Frame) 2% Sideband Response -1.25 MHz and below -20 dB -0.75 to -0.5 MHz +0.5 db, -2 dB -0.5 to +3.58 MHz ±0.5 dB +3.58 MHz to +4.18 MHz +0.
APPENDIX B DRAWINGS AND PARTS LISTS
UHF Analog Driver/Transmitter Appendix B Drawings and Parts Lists Innovator LX Series Analog System LX Series 10W to 100W System Block Diagram ...................................... 1302139 Chassis Assembly, 110 VAC Exciter, LX Series Interconnect....................................................................................... 1303108 OR Chassis Assembly, 220 VAC Exciter, LX Series Interconnect.......................................................................................
UHF Analog Driver/Transmitter Appendix B Drawings and Parts Lists Power Protection Board Schematic.......................................................................................... 1302839 Switch Board Schematic....................................................................................... 1527-3406 Power Amplifier Assembly - 1301923 Interconnect.......................................................................................