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Axcera INNOVATOR LX SERIES Instruction Manual

Uhf analog driver/transmitter
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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.com

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  • Page 1 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.com...

  • Page 2: Table Of Contents

    1.3 Safety................... 1-1 1.4 Maintenance .................. 1-2 1.5 Material Return Procedure ..............1-2 1.6 Limited One-Year Warranty for Axcera Products ........1-3 CHAPTER 2 SYSTEM DESCRIPTION & REMOTE CONTROL CONNECTIONS 2.1 System Overview ................2-1 2.1.1 Modulator Module (not used in a translator system) ....... 2-1 2.1.2 IF Processor Module ..............
  • Page 3 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........4-22 4.5.5 Coupler Board Assembly ............4-23 4.5.6 Amplifier Control Board............4-23...
  • Page 4 UHF Analog Driver/Transmitter Table of Contents LIST OF FIGURES FIGURE PAGE 1 kW Minimum Ventilation Configuration ........3-4 Front and Rear View Reconnection Drawing ........3-5 Rear View of LX Series Digital Transmitter........3-6 40-Watt UHF Amplifier Module ...........4-22 UHF Amplifier Module, 250 Watts..........4-23 40-Watt UHF Amplifier Module ...........4-27 Typical Red Field Spectrum............
  • Page 5 UHF Analog Driver/Transmitter Table of Contents LIST OF TABLES TABLE 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........2-2 Modulator Front Panel Sample ............. 2-3 IF Processor Front Panel Switch...........

  • Page 6: Chapter 1 Introduction

    This manual explains the installation, relevant appendix that contains the setup, alignment, and maintenance drawings for that item. procedures for the Innovator LX Series UHF analog modular driver/transmitter. 1.3 Safety It is important that you read all of the instructions, especially the safety...

  • Page 7: Maintenance

    The MRA# is intended to be used when dust, dirt, or insects will affect the the unit is returned to Axcera. In cooling of the components. This could addition, all shipping material should be...

  • Page 8: Limited One-Year Warranty For Axcera Products

    Department. the following: (a) repairing or replacing (in Axcera's sole discretion) any Axcera can also be contacted through e- defective parts free of charge (F.O.B. mail at info@axcera.com and on the Axcera’s plant) and/or (b) crediting (in Web at www.axcera.com.
  • Page 9 UHF Analog Driver/Transmitter Chapter 1, Introduction F F WARNING!!! × × HIGH VOLTAGE Ø Ø DO NOT ATTEMPT TO REPAIR OR TROUBLESHOOT THIS EQUIPMENT UNLESS FAMILIAR WITH OPERATION EXPERIENCED SERVICING HIGH VOLTAGE EQUIPMENT. LETHAL VOLTAGES ARE PRESENT WHEN POWER IS APPLIED TO THIS SYSTEM. IF POSSIBLE, TURN OFF POWER BEFORE MAKING ADJUSTMENTS TO THE SYSTEM.
  • Page 10 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.
  • Page 11 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. Visual Carrier Frequency (MHz) Crystal Frequency (MHz) (MHz) Channel Nominal Minus Plus...
  • Page 12 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. Visual Carrier Frequency (MHz) Crystal Frequency (MHz) (MHz) Channel Nominal Minus Plus...
  • Page 13 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 Frequency Assignments Channel Bandwidth Video Color Audio Number (MHz) (MHz) (MHz) (MHz) 470-476 471.25 474.83 475.75 476-482 477.25 480.83...
  • Page 14 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 Frequency Assignments Channel Bandwidth Video Color Audio Number (MHz) (MHz) (MHz) (MHz) 650-656 651.25 654.83 655.75 656-662 657.25 660.83...
  • Page 15 UHF Analog Driver/Transmitter Chapter 1, Introduction dBm, dBw, dBmV, dB V, & VOLTAGE µ µ EXPRESSED IN WATTS 50 Ohm System WATTS PREFIX VOLTAGE µ 1,000,000,000,000 1 TERAWATT +150 +120 100,000,000,000 100 GIGAWATTS +140 +110 10,000,000,000 10 GIGAWATTS +130 +100 1,000,000,000 1 GIGAWATT +120...
  • Page 16 UHF Analog Driver/Transmitter Chapter 1, Introduction USEFUL CONVERSION FACTORS TO CONVERT FROM MULTIPLY BY mile (US statute) kilometer (km) 1.609347 inch (in) millimeter (mm) 25.4 inch (in) centimeter (cm) 2.54 inch (in) meter (m) 0.0254 foot (ft) meter (m) 0.3048 yard (yd) meter (m) 0.9144...
  • Page 17 UHF Analog Driver/Transmitter Chapter 1, Introduction ABBREVIATIONS/ACRONYMS Alternating Current Printed circuit board Automatic Frequency Control Quadrature Amplitude Modulation Automatic Level Control Amplitude modulation Automatic Gain Control American wire gauge Bit Error Rate Bandwidth Direct Current Digital to analog Decibel Decibel referenced to 1 milliwatt dBmV Decibel referenced to 1 millivolt Decibel referenced to 1 watt...
  • Page 18 UHF Analog Driver/Transmitter Chapter 1, Introduction RETURN LOSS VS. VSWR 1.001 1.01 VSWR LX Series, Rev. 0 1-13...

  • Page 19: Chapter 2 System Description & Remote Control Connections

    UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Chapter 2 System Description & Remote Control Connections The analog transmitters in the Innovator determined by the level needed to attain LX Series are complete 10W to 100W the full output power of the transmitter. UHF Analog internally diplexed modular The driver’s maximum output is 7 Watts television transmitters that operate at a...
  • Page 20 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections The (A2) Modulator Assembly contains signal is fed through a SAW filter for the Modulator Board (1301797). The precise sideband shaping. The Modulator modulator is broadcast quality and operates using either the baseband audio provides front panel access to control and and video inputs or the 4.5-MHz monitoring points.

  • Page 21: If Processor Module

    UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.1.2 (A3) IF Processor Module System output power control. Through Assembly (1301938; Appendix B) 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).
  • Page 22 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections the transmitter or in Manual mode the reported on the Control Monitoring transmitter will continue to operate at board. When the IF Processor board 25% output. detects an Input Signal fault it automatically Mutes the transmitter.
  • Page 23 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.1.3 (A5) LO/Upconverter Module driver threshold is set by a front panel Assembly (1301930; Appendix B) Upconverter module potentiometer. When an over-drive condition is detected, the Upconverter module reduces its RF output level. For values less than 0.9 VDC, the Upconverter uses the AGC #1 voltage for automatic gain control by setting it's RF output to...
  • Page 24 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections sent to the backplane on two ports. One is set to the desired LO frequency in kHz port is sent to the Modulator module, if / 5 kHz. The maximum LO frequency present, and the other is routed to a setting with these parameters is BNC connector (J11) on the backplane...
  • Page 25 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.1.4 (A4) Control/Power Supply The (A4) Control & Monitoring/Power Module Assembly (110 VAC, Supply Assembly is configured at the 1301936 or 220 VAC, 1303229; factory for operation at 110 VAC or 220 Appendix B) VAC.

  • Page 26: Control & Monitoring/Power Supply Module

    UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.1.5 (A6) Power Amplifier Module connector of the Control & Assembly, Exciter, 100W Transmitter Monitoring/Power Supply module. (1301923; Appendix B) The 100 Watt Transmitter/Exciter Driver Power Amplifier module and any External Amplifier modules contain the same control and monitoring board.
  • Page 27 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections of control board switch SW1 must be set Amplifier module is routed to the on to route these lines as the system's Upconverter module as AGC #1. A RF power signals. In systems of output system over-drive condition is detected power greater than 50 Watts digital or when this value rises above 0.9 VDC.
  • Page 28 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Assembly (1301949), an Amplifier In analog systems, the Aural power of Control Board (1301962), a 1 Watt an Exciter Driver Power Amplifier and Module Assembly (1302891) and a TFS the Aural power of any external PA 40W UHF Module (1206693).

  • Page 29: Rf Output Assemblies

    UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Table 2-20. Driver Amplifier Status Indicator FUNCTION When lit Green, it indicates that the PA is in the Operate Mode. If a ENABLED Mute occurs, the PA will remain Enabled, until the input signal is (Green) returned.

  • Page 30: Principles Of Operation

    UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Processor will be enabled, the mute the output, the transmitter will not be in indicator on the front panel will be mute. Mute is a special case of the extinguished.
  • Page 31 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections • Power Amplifier Interlock is high • Receipt of a “Standby CMD” over the indicating that the amp lifier is not serial interface. installed. Operating Frequency Standby Mode The LX Series transmitter controller is The standby mode in the transmitter designed to operate on UHF frequencies.

  • Page 32: Customer Remote Connections

    UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections 2.4 Customer Remote Connections are made to the transmitter, they must The remote monitoring and operation of be made through plugs TB30 and TB31 the transmitter is provided through jacks at positions noted on the transmitter TB30 and TB31 located on the rear of the interconnect drawing and Table 2-20.
  • Page 33 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Signal Name Signal Type/Description Designations Discrete Open Collector Input - A pull down to ground on Transmitter TB30-7 this line indicates that the transmitter is to be placed into Stand-By the standby mode.
  • Page 34 UHF Analog Driver/Transmitter Chapter 2, System Description & Remote Control Connections Signal Name Signal Type/Description Designations TB30-16 +12 VDC available through Remote w/ 2 Amp re-settable RMT +12 VDC TB31-16 fuse TB30-18 -12 VDC available through Remote w/ 2 Amp re-settable RMT -12 VDC TB31-18 fuse...

  • Page 35: Chapter 3 Site Considerations, Installation And Setup Procedures

    40° F to 70° F throughout the year, need to be taken into account before the reasonably low humidity, and a dust-free Innovator LX Series analog room. It should be noted that this is driver/transmitter can be installed. For rarely if ever attainable in the real world.
  • Page 36 UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures sources of heat, such as personnel, and Do not have the air conditioner all should be taken into account. blowing directly onto the transmitter. Under certain Now that the amount of heat that must conditions, condensation may be removed is known, the next step is to occur on, or worse in, the...
  • Page 37 (see Figure 3-1). controlled, and be interlocked with the transmitter. System interlocking and thermostat settings should be reviewed with Axcera. As with any equipment installation, it is LX Series, Rev. 0...

  • Page 38: Unpacking The Chassis W/Modules, Bandpass And Trap Filters

    The chassis or cabinet Inform Axcera as to the extent of any in which it is mounted should be damage as soon as possible. grounded using copper strapping material.

  • Page 39: Ac Input

    UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures NOTE: To pull out the power amplifier Connect the bandpass filter and trap filter module for replacement purposes, the to the output of the chassis assembly. input and output coaxial cables must first be removed from the rear of the chassis assembly.
  • Page 40 UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Figure 3-3: Rear View of LX Series Analog Transmitter TB02 TB30 TB31 Table 3-1: Rear Chassis Connections for the LX Series Analog Transmitter. Port Type Function AC Input TB02 Term Base Band Audio Input Composite Audio Input...

  • Page 41: Front Panel Screens For The Exciter/Amplifier Chassis Assembly

    UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures 3.5.2 Front Panel Screens for the characters are special characters used to Exciter/Amplifier Chassis Assembly navigate up or down through the menu screens. Display text flashes on discrete A 4 x 20 display located on the front of fault conditions for all screens that the Control &...

  • Page 42: Menu 12 Transmitter Device Data Access Screen

    UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-5: Menu 11 - Error List Access Screen R R O R R O R ↑ ↓ This screen of the transmitter shows the current number of errors and provides operator access to view the error list.

  • Page 43: Menu 30 Transmitter Device Details Screen

    UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-9: Menu 30 - Transmitter Device Details Screen X M T M O D E O W E ↑ ↓ This screen of the transmitter allows access to the transmitter parameters of installed devices.

  • Page 44: Menu 40 Transmitter Set Up: Power Raise/Lower Screen

    UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures System Component Parameter Normal Faulted (Blinking) FORWARD POWER xxx% xxx% REFLECTED POWER xxx% xxx% AMP 1 CURRENT xx.xA xx.xA AMP 2 CURRENT xx.xA xx.xA TEMPERATURE CODE VERSION POWER SUPPLY STATE ON or OFF ±12V SUPPLY...

  • Page 45: Menu 40-2 Transmitter Set Up: Frequency Select Screen

    UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-14: Menu 40-2 - Transmitter Set-up: Frequency Select Screen A N S M I Q U E N C Y A B L C U S T ↑ ↓...

  • Page 46: Menu 40-7 Transmitter Set Up: Station Id Screen

    UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures Table 3-18: Menu 40-6 - Transmitter Set-up: Serial Address Screen A N S M I A D D R E ↑ ↓ This screen allows the user to set the serial address of the transmitter. The default address is 5.
  • Page 47 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 A N S M I B R A ↑ ↓ This screen is used to adjust the calibration of the system's reflected power. Table 3-23: Menu 40-11 - Transmitter Set-up: Forward Power Fault Threshold Screen A N S M I M U M...

  • Page 48: Initial Turn On

    UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures output sets a linear circuit voltage that VIDEO LOSS: This indicates the loss of is controlling a non-linear power circuit. Video to the modulator, when Red. If a problem occurred during the setup OVER MOD: This illuminates Red when and operation procedures, refer to the video is overmodulated.
  • Page 49 UHF Analog Driver/Transmitter Chapter 3, Site Considerations, Installation and Setup Procedures DC OK - This illuminates Green when DC OK - This illuminates Green when the DC outputs that connect to the the DC inputs to the PA module are modules in the transmitter are present.

  • Page 50: Chapter 4 Circuit Descriptions

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions Chapter 4 Circuit Descriptions 4.1 (A2) Modulator Module determined by the setting of the MONO, (1301929; Appendix B) balanced audio gain pot R110, accessed through the front panel. The output of the NOTE: Not used in a translator system. amplifier stage is wired to the summing point at U13C, pin 9.
  • Page 51 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions amplifier U13D. The amplified signal is 4.1.1.5 Phase Lock Loop (PLL) Circuit then applied though the SAP/PRO, SCA gain pot R150, accessed through the A sample of the signal from the 4.5-MHz front panel, to the summing point at pin aural VCO at the output of Q13, “M”, is 9 of U13C.
  • Page 52 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions frequency. The visual IF signal and the adjust the position of the curve. The group aural IF signal are then combined in the delayed video signal at the output of U3A diplexer circuit to produce the visual IF + is split with a sample connected to J8 on aural IF output, “G”, that is connected to the board that can be used for testing...
  • Page 53 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions of sync auto clamp circuit will not operating frequency and is the most automatically be clamped to the pre set sensitive in terms of temperature stability. level. Crystal Y1 operates in an oscillator circuit 4.1.1.9 Main Video Signal Path consisting of transistor Q24 and its (Part 2 of 2)
  • Page 54 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions through C152 to the amplifier U23A. The to produce the modulated 41.25-MHz aural output of U23A is split with one part IF signal. The audio modulated 4.5 MHz connecting to Q26 that shuts down the from 4.5 MHz VCO IC U16 connects, “J”, to 45.75 MHz oscillator.

  • Page 55: If Processor Module

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions matching network consisting of T3 and relay K4. The two relays are controlled by T4. One part of signal connects to J10, the Modulator Select command that is the 41.25 MHz + 45.75 MHz sample connected to J1C Pin 14C on the board.
  • Page 56 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions the tray is in a high RF environment. (If detected input signal level at U9A, pin 2, this is the case, the transmitter will have falls below this reference threshold, to be serviced with the tray cover off in approximately 10 dB below the normal spite of the presence of other RF signals).
  • Page 57 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions path is then established from the +12 series element, and CR2 is the second VDC line through Q5, the resistors R69 shunt element. The control voltage, which and R137, and the red LED DS3, input can be measured at TP1, originates either loss indicator, which is illuminated.
  • Page 58 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions matching circuits that makes it operate The signal is next applied to amplifier U17 as a wide-band IF amplifier. The output to compensate for the loss through the of U1 connects to J40 that is jumpered to L-pad.
  • Page 59 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions The amplitude and phase pre-distorted IF 4.2.1.9 ALC Circuit signals are combined by Z2 and connected to J37 that is jumpered to J36 The other path of the corrected IF signal at on the board. J37 can be used for the input to the frequency response testing or monitoring purposes of the IF corrector circuit is used in the ALC circuit.

  • Page 60: Lo/Upconverter Module

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions increasing its gain maintaining the same and the LED section of opto-isolator U11. output power level. These actions turn on the transistor section of U11 that applies -12 VDC through CR21 The ALC action starts with the ALC to U10A pin 3, and pulls down the detector level monitored at TP4.

  • Page 61: Uhf Generator Board

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions that is converted to a bias voltage that The UHF generator board is mounted in the connects to the VCO. This voltage UHF Generator Enclosure for EMI and RFI adjusts the output frequency of the VCO protection.

  • Page 62: Uhf Filters

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions then fed to the SMA RF output jack of the The local oscillator signal (+13 dBm) from board at J3. Typical output level of the UHF Generator Board, through (A5) a UHF signal is +16 dBm nominal. This output channel filter, connects to the board at jack connects through A5 a channel filter to J1, an SMA connector.
  • Page 63 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions appear as a good 50- Ω load at all and outer loop AGC reference voltage at frequencies. The pad, in the output line U10D. of the board, consisting of R20, R18, and R21 buffers the bad effects of the The AGC output reference from the reactive filter load and makes it appear exciter/amplifier PA mo dule, AGC #1...
  • Page 64 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions The RF then enters a coupler stage, applied through the K1 relay pin 14 to pin which provides a sample of the RF at J7 1 to the IC U9. (–20dB), the front panel RF sample jack. The main path through coupler is to J43 With the relay de-energized, the externally pin 25B, the Upconverter RF output jack...
  • Page 65 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions With no external 10-MHz reference input, down signals are compared inside of U9 the level connected to U7A Pin 2 will be and any differences are connected to U9 low. This will be less than the reference pin 16.

  • Page 66: Control Monitoring/Power Supply Module

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions jack J43 pin 15A, the PLL Lock Indicator The AC input to the Pioneer output of the board. Exciter/Amplifier Chassis Assembly is connected from J1, part of a fused entry Voltage Requirements module, located on the rear of the chassis assembly to J50 on the Control The board is powered by ±12 VDC that is Monitoring/Power Supply Module.
  • Page 67 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions The polyswitch resettable fuses may The connections from J62 and J63 of the open on a current as low as 2.43 Amps Power Protection Board are wired to J62 at 50 C, 3 Amps at 25 C or 3.3 Amps at and J63 on the Control Board.
  • Page 68 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions U3 and U4 are used to selectively enable turn on threshold of the FET (about 2 various input and output ICs found on VDC), a logic high is applied to the digital pages 2 & 3 of the schematic. input buffer, U9.

  • Page 69: Switch Board

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions Power Protection Board. The ±12 VDC slightly greater than the red element. generated by the switching power This occurs because the current limiting supply connects to J62 and J63 after resistors have a sma ller ohm value in the being fuse protected on the Power green circuit.

  • Page 70: Watt Uhf Amplifier Board

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions power supply at V1-6 & 7. The power the assembly is at the SMA Jack J4. supply is configured for three output Typically, with an input signal of +4 dBm voltages +12V, -12V, at the 8 position at J1 of the assembly, an output of terminal block, and a main output power +21 dBm can be expected at J2.
  • Page 71 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions deliver an output power of 40 watts of potentiometers R807 and R808. The (CW) with approximately 14 dB of gain. settings are factory implemented and should not be altered. The amplification circuit consists of LDMOS transistors V804 and V805 PIN diodes V810 &...
  • Page 72 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions 4.5.5 (A4) Coupler Board Assembly A must be set and not changed during an (1301949; Appendix B) analog input read of channels PA5-PA7. PA4 of U4 is a processor operating LED The UHF coupler board assembly that monitors the +/ -12 VDC.
  • Page 73 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions than or equal to 1%. 100mA of current ground sets the gain of the amplifier to is available from each devic e but again about 17.28. This value is not set with the controller will not need this much much accuracy since the manufacturer current.

  • Page 74: 1-Watt Uhf Amplifier Board

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions circuit. The detected level is connected of band rejection of unwanted products. to L4 that is part of an intercarrier notch The filtered RF Output at the “N” connector filter circuit that is tuned to eliminate the jack (J2) of the Trap Filter is cabled to the 4.5 MHz aural intercarrier, if present.
  • Page 75 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions 4.6.2 (A1-A1) 1-Watt UHF Amplifier amplifier assembly (Figure 4-1). The Board (1302761; Appendix B) assembly is made up of a (51-5378-308- 00) module, which operates class AB and is The 1-watt UHF amplifier board is a highly linear broadband amplifier for the mounted in the 1-watt UHF amplifier frequency range of 470 to 860 MHz.

  • Page 76: Amplifier Control Board

    UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions board where it connects to the input of analog switch U1. PA7 is connected to a the overdrive-protection circuit. via, V10, for future access. The RF input to the UHF coupler U6 is a serial to RS-485 driver IC. U7 is a assembly, from the 40 Watt UHF watchdog IC used to hold the amplifier module, connects to SMA jack...
  • Page 77 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions regulated voltage that is about 5 volts stability of –200 ppm/C, but instead the less than the +32 VDC supply, microcontroller will determine the exact approximately +26.25 VDC. When the gain of the circuit and use a correction +32 VDC supply is enabled, the circuitry factor for measurements.
  • Page 78 UHF Analog Driver/Transmitter Chapter 4, Circuit Descriptions of U26C is connected to the comparator Reflected Power Fault that is connected to IC U26B that has Aural Null and Offset an output of the board, the Fault Alert Null, if present in the system, connected circuit and also shuts down Amplifier #1.

  • Page 79: Chapter 5 Detailed Alignment Procedures

    The failed module can then be sent back to Axcera for repair. Contact Each module has the name of the Axcera Customer Service Department at module on the front, bottom for 724-873-8100 or fax to 724-873-8105, identification and correct placement.
  • Page 80 UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures 5.2 LX Series Exciter/Amplifier following details the meaning of each Chassis Assembly LED: This transmitter operates using the AURAL UNLOCK (DS5) – Red Indicates baseband audio and video inputs or, if that 4.5 MHz Aural IF is unlocked from the (optional) 4.5-MHz composite input the Nominal 45.75 MHz visual IF.

  • Page 81: Linearity Correction Adjustment

    UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures MONO SET UP: The modulator was • DS4 (Mute) – Indicates that a Mute factory set for a ±25-kHz deviation with command is present to the system. a mono, balanced, audio input of +10 dBm.

  • Page 82: Frequency Response Delay Equalization Adjustment

    UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures Module. The adjustments are threshold linearity correction adjustment R231 settings that are adjusted as needed to threshold cut in for the quadrature correct for any amplitude or phase phase distortion pre-correction that is intermod problems.

  • Page 83: Alignment Procedure For The Bandpass Filter Assembly

    If a problem occurred during the panel LCD display in the % Visual Output alignment, help can be found by calling position. Axcera field support at 724-873-8100. 5.3 Alignment Procedure for the With the spectrum analyzer set to zero Bandpass Filter Assembly span mode, obtain a peak reference on the screen.
  • Page 84 UHF Analog Driver/Transmitter Chapter 5, Detailed Alignment Procedures the Outer Sleeve and the Center Rod of Center Conductor with an Allen Wrench the Notch can be adjusted to tune the and move it Deeper for a Lower Notch Frequency. The Depth of the Frequency Notch or out for a Higher Notch is set by the gap between the Frequency Notch.
  • Page 85 APPENDIX A LX SERIES ANALOG SYSTEM SPECIFICATIONS...
  • Page 87 * For transmitters use “T” suffix, translators use “L” suffix (ex. LU100AT - 100W Transmitter) Specifications published here are current as of the date of publication of this document. Because we are continuously improving our products, Axcera reserves the right to change specifications without prior notice.
  • Page 88 APPENDIX B DRAWINGS AND PARTS LISTS...
  • Page 89 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.................1303108 Backplane Board, LX Series Schematic ..................1301995...
  • Page 90 UHF Analog Driver/Transmitter Appendix B Drawings and Parts Lists Switch Board Schematic .................1527-3406 Power Amplifier Assembly - 1301923 Interconnect.................1302061 OR Driver Amplifier Assembly, (Used in High Power Systems) Interconnect.................1303452 Assembly consists of: Coupler Board Assembly Schematic ..................1303152 Amplifier Control Board Schematic ..................1301964 1 Watt Module Assembly Contains a 1 Watt UHF Amplifier Board (1302761).

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