Preliminary Instruction Manual CU250ATD Innovator 250-Watt 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.
Innovator CU250ATD, 250 Watt Transmitter Table of Contents CU250ATD INNOVATOR 250-WATT TRANSMITTER Introduction ..................................................................................................1 Manual Overview .....................................................................................1 Assembly Designators ..............................................................................1 Safety .......................................................................................
Innovator CU250ATD, 250 Watt Transmitter Introduction Manual Overview This manual describes the transmitter, along with the setup and alignment procedures for the transmitter. Assembly Designators Axcera has assigned assembly numbers, Ax designations such as A1, where x=1,2,3…etc, to all assemblies, modules, and boards in the system. These designations are referenced in the text of this manual and shown on the block diagram and interconnect drawings provided in the appendix.
Innovator CU250ATD, 250 Watt Transmitter Introduction Ventilation – Openings in the cabinet and module front panels are provided for ventilation. To ensure the reliable operation of the driver/transmitter, and to protect the unit from overheating, these openings must not be blocked. Servicing – Do not attempt to service this product yourself until becoming familiar with the equipment. If in doubt, refer all servicing questions to qualified Axcera service personnel.
Innovator CU250ATD, 250 Watt Transmitter Introduction When shipping an item to Axcera, please include the RMA# on the packing list and on the shipping container. The packing slip should also include contact information and a brief description of why the unit is being returned. Please forward all RMA items to: AXCERA, LLC 103 Freedom Drive P.O. Box 525 Lawrence, PA 15055-0525 USA For more information concerning this procedure, call the Axcera Field Service Department at (724) 873-8100.
Innovator CU250ATD, 250 Watt Transmitter Introduction F WARNING!!! × HIGH VOLTAGE Ø DO NOT ATTEMPT TO REPAIR OR TROUBLESHOOT THIS EQUIPMENT UNLESS YOU ARE FAMILIAR WITH ITS OPERATION AND EXPERIENCED IN SERVICING HIGH VOLTAGE EQUIPMENT. LETHAL VOLTAGES ARE PRESENT WHEN POWER IS APPLIED TO THIS SYSTEM. IF POSSIBLE, TURN OFF POWER BEFORE MAKING ADJUSTMENTS TO THE SYSTEM.
Innovator CU250ATD, 250 Watt Transmitter Introduction EMERGENCY FIRST AID INSTRUCTIONS Personnel engaged in the installation, operation, or maintenance of this equipment are urged to become familiar with the following rules both in theory and practice. It is the duty of all operating personnel to be prepared to give adequate Emergency First Aid and thereby prevent avoidable loss of life. RESCUE BREATHING 1. Find out if the person is breathing. You must find out if the person has stopped breathing.
Innovator CU250ATD, 250 Watt Transmitter Introduction dBm, dBw, dBmV, dBµV, & VOLTAGE EXPRESSED IN WATTS 50 Ohm System WATTS 1,000,000,000,000 100,000,000,000 10,000,000,000 1,000,000,000 100,000,000 10,000,000 1,000,000 100,000 10,000 1,000 100 50 20 10 1 0.1 0.01 0.001 0.0001 0.00001 0.000001 0.0000001 0.00000001 0.000000001 0.0000000001 0.00000000001 0.
Innovator CU250ATD, 250 Watt Transmitter Introduction USEFUL CONVERSION FACTORS TO CONVERT FROM TO MULTIPLY BY mile (US statute) kilometer (km) inch (in) millimeter (mm) inch (in) centimeter (cm) inch (in) meter (m) foot (ft) meter (m) yard (yd) meter (m) mile per hour (mph) kilometer per hour(km/hr) mile per hour (mph) meter per second (m/s) pound (lb) kilogram (kg) gallon (gal) liter U.S. liquid (One U.S. gallon equals 0.
Innovator CU250ATD, 250 Watt Transmitter Introduction RETURN LOSS VS. VSWR 0 -10 -20 R E T U R N L O S S -30 dB -40 -50 -60 - 1.001 1.01 1.1 VSWR Instruction Manual, Rev. 0 8 2.
Innovator CU250ATD, 250 Watt Transmitter Introduction ABBREVIATIONS/ACRONYMS AC Alternating Current FM Frequency modulation AFC Automatic Frequency Control FPGA Field Programmable Gate Array ALC Automatic Level Control Hz Hertz AM Amplitude modulation ICPM Incidental Carrier Phase Modulation AGC Automatic Gain Control I/P Input AWG American wire gauge IF Intermediate Frequency BER Bit Error Rate LED Light emitting diode BW Bandwidth LSB Lower Sideband DC Direct Current MPEG D
Innovator CU250ATD, 250 Watt Transmitter Tray Description CU250ATD Innovator 250-Watt Transmitter Figure 1: Front View of 30W Driver Tray. 30W Driver Tray Description The Driver Tray accepts an RF On Channel signal (-79 to –8 dBm) and converts it to a DTV RF On Channel output signal at 30 Watts. The transmitter provides linear and nonlinear correction capability for the transmission path as well as internal test sources that are used during initial transmitter installation.
Innovator CU250ATD, 250 Watt Transmitter Tray Description The channel coder portion, inside the FPGA, generates the 8 distinct levels in an 8 VSB transmitter. These levels are subsequently input to a linear equalizer that provides for frequency response correction in the transmission path. The linear equalizer is a 67-tap FIR filter that is loaded with tap values from the microcontroller, U1, located on this board.
Innovator CU250ATD, 250 Watt Transmitter Tray Description (A6-A1) 2 Stage UHF Amplifier Board, (1308784) The 2 Stage UHF Amplifier Board, (1308784) consists of a driver stage and a parallel connected final amplifier stage, which have a total gain of approximately 23 dB. The working point settings for the 2 Stage Amplifier Board are factory set using the potentiometers R32 for Q2, R15 for Q1, and R24 for Q3 and should not be altered.
Innovator CU250ATD, 250 Watt Transmitter Tray Description 30W Driver Tray Power Supplies The 110VAC or 220VAC, needed to operate the tray, connects through the AC power cord at J6, the power entry module located on the rear panel of the tray. An On/Off 10A/250VAC circuit breaker is part of the power entry module. With the circuit breaker switched On, the (L) line input is wired to F1 a 20 Amp fuse for over current protection.
Innovator CU250ATD, 250 Watt Transmitter Tray Description 30W Driver Tray Input and Output Connections The input connections to the 30W Driver Tray are made to the jacks mounted on the rear of the tray. The tray accepts an On Channel RF signal at J1, the RF input jack, and outputs a digital RF ON Channel signal at J2, the RF Output Jack. A 10 MHz reference input connects to J3 on the tray. Refer to Figure 2 and to Table 4 that follow for detailed information.
Innovator CU250ATD, 250 Watt Transmitter Signal Name J5 Pin Designations RMT RF System Interlock 5 RMT Reflected Power 6 RMT Fault Reset 7 RMT Operate Status RMT Fault RMT Input Fault Not Used 11 13 15 16 Instruction Manual, Rev. 0 Tray Description Signal Type/Description When this signal's circuit is completed to ground, the transmitter is allowed to operate. If this circuit is opened, the transmitter switches to Standby. Analog Output - 0 to 4.
Innovator CU250ATD, 250 Watt Transmitter Front Panel Screens Description Front Panel Screens for the Transmitter A LCD display located on the front of the Driver Tray displays the current operating status of the transmitter. The screens are scrolled through using the buttons to the right of the display. The Left & Right Arrows scroll through the Main Menus, which are shown below aligned on the left side.
Innovator CU250ATD, 250 Watt Transmitter Front Panel Screens Description Table 10: Modulator Status Screen This menu indicates if the modulator has an SMPTE-310 signal input coming from the demodulator. This menu only provides status information and no adjustments are available. This menu indicates if the Phase Lock Loop A in the modulator is locked. This menu only provides status information and no adjustments are available. This menu indicates if the Phase Lock Loop B in the modulator is locked.
Innovator CU250ATD, 250 Watt Transmitter Front Panel Screens Description Table 13: Demodulator Channel Set Up Screen The channel setup screen can be accessed by holding the left and right arrow keys down until the setup screen is displayed. Once the user is in this menu, the channel plan can be changed to either broadcast or cable by hitting the ENTER button. In addition, the receive channel can be changed by hitting the up or down arrow to select the channel.
Innovator CU250ATD, 250 Watt Transmitter System Alignment CU250ATD Innovator 250-Watt Transmitter Figure 3: Front View of the 250W Power Amplifier Tray. 250W Power Amplifier Tray Description The 250-Watt Power Amplifier Tray accepts an RF On Channel signal from the 30-Watt driver tray and amplifies the signal to a power level of 250 Watts.
Innovator CU250ATD, 250 Watt Transmitter System Alignment Table 6: 250W UHF Amplifier Tray Operate/Standby Indicators LED FUNCTION ENABLE When lit, indicates that the system is in Operate. When (Green) extinguished, indicates that the system is in Standby. A Green LED indicates that the system is functioning normally. A STATUS flashing Red LED indicates a fault is occurring at this time. An (Green/Red/ Amber LED indicates a fault occurred in the past but the system Amber) is now operating normally.
Innovator CU250ATD, 250 Watt Transmitter System Alignment System Alignment This transmitter was aligned at the factory and should not require additional adjustments to achieve normal operation. This transmitter is of a tray design with multiple boards inside the tray. If a board fails, that board needs to be changed out with a replacement board. The failed board can then be sent back to Axcera for repair.
Innovator CU250ATD, 250 Watt Transmitter System Alignment 6 MHz -35 dB -110 dB 3 MHz 6 MHz Figure 3: Typical Digital Spectrum Linearity Correction Adjustment (Non-Linear Distortions) As shipped, the transmitter was preset to include amplitude and phase pre-distortion. The pre-distortion was adjusted to approximately compensate the corresponding non-linear distortions of the Power Amplifier.
Innovator CU250ATD, 250 Watt Transmitter System Alignment The center frequency for the second stage is 41.5 MHz. Adjust R25 for the best depth of frequency response correction at 41.5 MHz. C15 may need to be adjusted to attain best depth at 41.5 MHz. The center frequency for the third stage is 44 MHz. Adjust R26 for the best depth of frequency response correction at 44 MHz. C16 may need to be adjusted to attain best depth at 44 MHz.
APPENDIX A DRAWINGS LIST
Innovator CU250ATD, 250 Watt Transmitter Appendix A, Drawings List CU250ATD Innovator Transmitter 30-Watt Driver Tray 30-Watt Driver Tray Block Diagram.................................................................. 1308815 8 VSB Modulator Board Schematic ................................................................... 1308276 Power Conditioning Board Schematic................................................................ 1309405 Digital Modulator Board Schematic....................................
APPENDIX B TRANSMITTER SPECIFICATIONS
INNOVATOR CX Low Power UHF DTV Transmitter/Translator 5W - 250W Designed to provide broadcasters a cost effective product that will meet their needs like no other solution on the market, this new low power transmitter line uses the latest LDMOS devices for broadband operation across the entire UHF band, and can be configured as a DTV transmitter or regenerative translator.
INNOVATOR CX DIGITAL Low Power UHF DTV Transmitter/Translator 5W - 250W Specifications Options General Output Parameters AC Surge Protector GPS Receiver Stringent Mask Filter Spare Parts Kit Climate Controlled Outdoor Enclosure Equipment Rack Standard ATSC Connector Type N Impedance 50 Ohms Bandwidth 6 MHz Test Signal Internal PRBS-23 Frequency Range 1 2 470 to 806 MHz 1 Frequency Stability w/precise frequency control ±1 ppm (max.
