OUSCU250ATD250-Watt UHF Digital Transmitter

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 • [email protected] Innovator CU250ATD, 250 Watt Transmitter Table of Contents Instruction Manual, Rev. 0 August 14, 2007 CU250ATD INNOVATOR 250-WATT TRANSMITTER Introduction..................................................................................................1 Manual Overview.....................................................................................1 Assembly Designators..............................................................................1 Safety....................................................................................................1 Contact Information.................................................................................2 Return Material Procedure........................................................................2 Warranty Information...............................................................................3 30W Driver Tray Description.........................................................................10 8 VSB Demodulator Board......................................................................10 8 VSB Modulator Board..........................................................................10 Amplifier Assembly................................................................................11 2 Stage UHF Amplifier Board,...........................................................12 RF Module Pallet w/Philips Transistors...............................................12 Output Detector Board...........................................................................12 30W Driver Tray Power Supplies.............................................................13 30W Driver Tray LCD Display and Front Panel LED Indicators...........................13 30W Driver Tray Input and Output Connections...............................................14 30W Driver Tray Remote Connections............................................................14 Front Panel Screens for the Transmitter..........................................................16 250W Power Amplifier Tray Description..........................................................19 2-W ay Splitter......................................................................................19 600W PEP RF Pallet................................................................................19 2-Way Combiner...................................................................................19 Amplifier Control Board..........................................................................19 +12VDC Switching Power Supply............................................................19 +30VDC Switching Power Supply............................................................19 250W Power Amplifier Input and Output Connections.......................................20 System Alignment...................................................................................................21 Set Up of the Output Power of the Transmitter..........................................21 ALC Board Set-Up in the Transmitter.......................................................21 Linearity Correction Adjustment..............................................................22 Frequency Response Delay Equalization Adjustment..................................22 Appendix A Drawings List..............................................................................................A-1 Transmitter Specifications............................................................................B-1 Innovator CU250ATD, 250 Watt Transmitter Introduction Instruction Manual, Rev. 0 1 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. The cables that connect between the boards within a tray or assembly and that connect between the trays, racks and cabinets are labeled using Brady markers. Figure 1 is an example of a Brady marked cable. There may be as few as two or as many as four Markers on any one cable. These Brady markers are read starting furthest from the connector. If there are four Brady Markers, this marker is the transmitter number such as transmitter 1 or transmitter 2. The next or the furthest Brady Marker is the rack or cabinet number on an interconnect cable or the board number within a tray. The next number on an interconnect cable is the Tray location or number. The Brady marker closest to the connector is the jack or connector number on an interconnect cable or the jack or connector number on the board within a tray. Figure 1: Brady Marker Identification Drawing Safety The transmitter systems manufactured by Axcera are designed to be easy to use and repair while providing protection from electrical and mechanical hazards. Please review the following warnings and familiarize yourself with the operation and servicing procedures before working on the transmitter system. Read All safety Instructions – All of the safety instructions should be read and understood before operating this equipment. Retain Manuals – The manuals for the transmitter should be retained at the transmitter site for future reference. Axcera provides two manuals for this purpose; one manual can be left at the office while the other can be kept at the site. Heed all Notes, Warnings, and Cautions – All of the 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 tr…

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December 7, 2007 Federal Communications Commission 445 12th Street, SW Washington, DC 20554 Gentlemen: Axcera is submitting this FCC Equipment Authorization report for the CU250ATD, a 250-watt UHF digital television transmitter. We are applying for a low- power television, Equipment Authorization approval for this UHF transmitter. The FCC identifier selected for this product is OUSCU250ATD. The CU250ATD is a complete 250-watt UHF solid-state digital transmitter. It operates at a nominal output power of 250 watts average, while meeting or exceeding the FCC simple and stringent mask requirements. The transmitter may also be operated at 25 watts average with equivalent or improved performance. The CU250ATD will cover the frequencies of 470 MHz to 608 MHz & 614 MHz to 806 MHz. The enclosed application and test data report are intended to demonstrate compliance with FCC guidelines. Please contact me if you have any questions or if you need additional information. I can be reached by fax at (724) 873-8105 or phone at (724) 873-8100, extension 233. Sincerely, ______________________ David W. Brooking Principal Engineer

Axcera-CU250ATD FCC Equipment Authorization Report External Photos December 2007 2-1 2. EXTERNAL PHOTOS 2.1 Front view, complete Axcera-CU250ATD Transmitter Axcera-CU250ATD FCC Equipment Authorization Report External Photos December 2007 2-2 2.2 Rear view, complete, Axcera-CU250ATD Transmitter

Axcera-CU250ATD FCC Type Acceptance Report ID Label/Location Info December 2007 1-1 1. ID LABEL/LOCATION INFO 1.1 Rear Panel FCC Label 1.2 Rear Panel Manufacturer’s Label Axcera-CU250ATD FCC Type Acceptance Report ID Label/Location Info December 2007 1-2 1.3 Rear view, Axcera-CU250ATD Transmitter with FCC Label and Manufacturer’s Label

Axcera-CU250ATD FCC Equipment Authorization Report Internal Photos December 2007 6-1 6. INTERNAL PHOTOS 6.1 Top view, 30W Driver Tray Axcera-CU250ATD FCC Equipment Authorization Report Internal Photos December 2007 6-2 6.2 Top view, 250W Amplifier Tray

Axcera-CU250ATD Equipment Authorization Report Operational Description December 2007 8-1 8. OPERATIONAL DESCRIPTION - MODEL Axcera-CU250ATD 8.1 General Description The CU250ATD is a complete 250-watt UHF solid-state, digital television transmitter. It operates at a nominal output power of 250 watts average. 8.2 Technical Specifications Type of Emission .....................................................................6M00K1D Frequency Range........................470 MHz to 608 MHz and 614 to 806 MHz Output Power............................................................. 250 watts average 8.3 Performance Specifications Operating Frequency Range .........470 MHz to 608 MHz and 614 to 806 MHz RF output - Nominal: Power ............................................................. 250 watts average Impedance .................................................................... 50 ohms Connector ............................................................................ “N” Regulation of Output........................................................................ 3% Signal-to-Noise Ratio (SNR) ........................................... 27 dB or better Carrier Frequency Stability.......................................................... ±1 ppm Out of Band: Compliant with FCC Simple or Stringent Mask (Measured in 30 KHz RBW, relative to total average power) Data Interface: Input Rate.................................................... 19.39 Mbps, 6 MHz Channel Input Interface...............................................SMPTE 310M (ASI optional) Electrical Requirements Power Line Voltage .............................................208-240 volts, 50/60 Hz Power Consumption .............................................................. 1700 watts Environmental Maximum Altitude ..................................................................8,500 feet Operational Temperature Range ...........................................0°C to +50°C Axcera-CU250ATD Equipment Authorization Report Operational Description December 2007 8-2 Mechanical Dimensions: Width .............................................................. 19” (Rack mount) Height................................................................................. 7RU Weight ......................................................................... 150 lbs 8.4. System Overview The CU250ATD is made up of the trays/assemblies listed in Table 8-1. Table 8-1. CU250ATD Major Trays and Assemblies MAJOR ASSEMBLY DESIGNATOR TRAY/ASSEMBLY NAME A1 Digital 30W Driver Tray A2 Digital UHF Amplifier 8.4.1 30W Driver Tray 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 250 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. 8.4.1.1 (A1) 8 VSB Demodulator Board (1308275) The RF input to the Transmitter is connected to the J1 BNC connector located on the rear panel of the tray. This RF signal is wired to (A1) the 8 VSB demodulator board (1308275), which generates a SMPTE-310 output at J13. The (A1) 8 VSB demodulator assembly receives an off air 8 VSB signal on any VHF or UHF channel and demodulates this to an MPEG-2 transport stream that is per the SMPTE-310M standard. The input to the assembly is at an “F” style connector on the shielded tuner and can be at a level of –78 dBm to –8 dBm. The tuner (TU1) down converts the RF channel to a 44 MHz IF signal. This IF signal is the input to the digital receiver chip U1. The digital receiver chip subsequently decodes the IF and delivers an MPEG-2 transport stream, on a parallel data bus, to a programmable logic array, U8. U8 clocks the asynchronous MPEG data from the receiver chip and outputs a synchronous data stream at a 19.39 MHz rate to buffer/driver U11. U11 subsequently drives the output at J13 to a lower level that is AC coupled out of the board and is cabled to J42 on the 8 VSB Modulator Board. 8.4.1.2 (A2) 8 VSB Modulator Board (1304883) The (A2) 8 VSB Modulator Board (1304883) accepts the SMPTE-310 MPEG data stream input at the SMA connector J42 and produces a 6 MHz wide IF output, at the IF Output Jack J38. The IF output is centered at 44 MHz using a pilot carrier of 46.69 MHz generated on the board. This SMPTE-310 MPEG data stream input is applied to a high-speed window comparator U21 that adjusts the level to a low voltage TTL signal to be used by the Altera FPGA, U3. The SMPTE-310 signal is input to the FPGA to recover the clock Axcera-CU250ATD Equipment Authorization Report Operational Description December 2007 8-3 and the data. A portion of the clock and recovery circuit is performed by a high- speed comparator, U17, which functions as an external delay circuit. The FPGA subsequently uses the SMPTE-310 clock and data as the input to the channel coder contained inside the FPGA. The channel coder is a series of DSP blocks defined by the ATSC standard for 8 VSB data transmission. These blocks include the data randomizer, Reed Solomon Encoder, data interleaver, trellis coder, and sync inserter. 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. 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 inside the FPGA. The pulse shaping filters are FIR filters that have fixed tap values that are preset inside the FPGA. The output of the pulse shaping filters is then applied to a Pre-Distortion Linearizer chip, U4, which can be used to correct for nonlinearities in the data transmission path. The output…

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Axcera-CU250ATD FCC Equipment Authorization Report Parts List/Tune-up Info December 2007 7-1 7. PARTS LIST/TUNE-UP INFO 7.1 Parts List The transmitter, can be subdivided as follows: 30W Driver Tray: 8 VSB Modulator Board Power Conditioning Board Digital Modulator Board Pre-Corrector Board ALC Board Output Detector Board Control Card Board Frequency Agile Upconverter Board Two Stage UHF Amplifier Board Amplifier Module Astec Switching Power Supply Densei-Lamda Switching Power Supply 250W Amplifier Tray: Amplifier Control Board 2-Way Splitter Board (2) 600W PEP RF Pallets 2-Way Combiner Board +12VDC Switching Power Supply +30VDC Switching Power Supply 7.2 Tune-Up Information 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 for repair. 7.2.1 Set-Up of the Output Power of the Transmitter Check that the Auto/Man switch S1 on the IF Pre-Corrector Board is in the Automatic ALC position. This is the normal operating position for the switch. The voltage at TP1 on the IF Pre-Corrector Board should be .8 VDC with 100% output power. Check that the Auto/Man switch S1 on the ALC Board is in the Automatic ALC position. Adjust R75 the ALC pot on the ALC Board as needed to attain 100% output power. Switch to Manual Gain (Manual ALC) and adjust the Manual Gain pot R62 for 100 % output power. Switch the ALC Board back to Automatic ALC. 7.2.2 ALC Board Set-Up In the Tray On (A5) the ALC Board (1308570), preset the Overdrive Threshold pot R38 full CW and Axcera-CU250ATD FCC Equipment Authorization Report Parts List/Tune-up Info December 2007 7-2 set R62, Manual Adjust, and R75, ALC Adjust, full CCW. Apply an 8-VSB signal at -3 dBm average level to the J1 input jack to the tray. Switch S1 to Manual Gain, and increase the output power to 100%. Calibrate the transmitter output power using R23, Forward Calibration pot, on the Output Detector Board. Turn the output power down to 10% power. Remove the output RF connector from J2 on tray and calibrate the reflected power to 10%, using R7, the Reflected Calibration pot, on the Output Detector Board. Re-connect the RF output connector to the tray and increase the power, in Manual gain, to 110%. Adjust the Overdrive pot R38, CCW until the overdrive threshold just trips and the Overdrive Fault LED DS4 lights. Turn the pot slightly CW so that power comes back up and DS4 goes out. Switch S1 to ALC. Turn the ALC Adjust pot R75 until the power is 100%. Switch S1 between ALC and Manual to verify smooth switching, with minimal change in power. Switch the tray Off and insert a 10 dB attenuator at the input. Switch the tray On and verify the input fault LED comes on and the RF power Mutes. Output power should drop by at least 20-30 dB. Switch the tray Off and remove the 10 dB attenuator. Replace the input connector and turn the tray back on. With the tray in ALC, 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%. Reconnect the RF output connector and increase the power back up to 100%. This completes the set up of the ALC board. 6 MHz -35 dB -110 dB 3 MHz 6 MHz Figure 3: Typical Digital Spectrum 7.2.3 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. NOTE: On (A3) the IF pre-corrector board (1308796), check that the correction enable/disable jumper W4 on J8 is in the Enable position, between pins 2 & 3. Axcera-CU250ATD FCC Equipment Authorization Report Parts List/Tune-up Info December 2007 7-3 Set up a spectrum analyzer with 30 kHz resolution bandwidth and 30 kHz video bandwidth to monitor the intermodulation products of the RF output signal of the Tray at J2. A typical digital spectrum is shown in Figure 3. There are three Corrector stages, two in phase and one quadrature, adjustments located on the IF Pre-Corrector Board. The adjustments are threshold settings that are adjusted as needed to correct for any amplitude or phase intermod problems. Adjust in phase linearity correction adjustment R67 threshold 1 cut in for the in phase amplitude distortion pre-correction that is needed. Next adjust the linearity correction adjustment R69 threshold 2 cut in also for the in phase amplitude distortion pre-correction that is needed. Finally, adjust the quadrature linearity correction adjustment R89, threshold cut in, for the quadrature phase distortion pre-correction that is needed. The above pots are adjusted for the greatest separation between the digital signal and the intermod at the channel edges. 7.2.4 Frequency Response Delay Equalization Adjustment at 44 MHz The procedure for performing a frequency response delay equalization adjustment for the transmitter is described in the following steps. Check that the jumpers on J4, J5 & J6 are set for 44 MHz between Pins 2 & 3. The center frequency for the first stage is 46.5 MHz. Adjust R24, located on the IF Pre- Corrector Board, for the best depth of frequency response correction at 46.5 MHz. C14 may need to be adjusted to attain best depth at 46.5 MHz. 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. After the three delay attenuation equalizers have been adjusted, fine tune, as needed, …

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SWS300/600 Series 3055 Del Sol Blvd • San Diego, CA 92154 • 1-800-LAMBDA-4 77 ‹Meets IEC61000-4‹Greater reliability ‹Global safety Approvals‹Supports Global Use ‹Power Factor Corrected‹Supports Global Use ‹Level B EMI‹Assists System Compliance FeatureBenefit Factory AutomationProcess Control, NC-Machining, Automotive, Packaging Equipment, Materials Handling, Chemical Processing, Robots Test & MeasurementBurn-in & Test, Automated, Detection Test, Instrumentation, Measurement Automated ServiceVending Machines, Elevators, Video Gaming, Point of Sale Equipment ‹Low Cost ‹Active Power Factor Correction ‹Universal Input (85 - 265VAC) ‹Input Transient Protected IEC61000-4 ‹SEMI F47 Certified (208VAC Input) Key Market Segments & Applications SWS Features and Benefits Single Output General Purpose Power Supplies MODELSWS300SWS600 ITEMS Input Voltage range (1)-85 - 265VAC (47 - 63Hz) or 120 - 370VDC Inrush Current (115 / 230VAC)A20 / 40 at 25°C, cold start Power Factor-Meets EN61000-3-2 Input Current (100/200VAC)A3.6 / 1.8A7.2 / 3.6A Temperature Coefficient-<0.02%/°C Overcurrent Protection-->105%, Constant current style Overvoltage ProtectionV3.3V: 4.1-5.3V, 5V: 6.25-7.5V, 12V: 13.8-16.8V 15V: 19.3-24.2V, 24V: 30-34.8V, 36V: 41.4-50.4V, 48V: 60-69.6V Overtemperature Protection-Yes, cycle AC to reset Hold Up Time (Typ)ms20ms at 115/230VAC Leakage Current (max)mASWS300: 0.75mA , SWS600: 1.5mA Remote Sense-NoneYes Parallel Connection-NoneYes Remote On/Off-NoneYes, >4.5V to shutdown Power Fail Signal-NoneYes, open collector output LED Indicator-Green LED = On Operating Temperature--10 to +65°C (See table for derating - model specific) Storage Temperature°C-30 to +85°C Humidity (non-condensing)-30 - 90% RH operating, 10 - 95%RH non operating Cooling-Internal fan Withstand Voltage-I/P to Grnd 2kVAC, I/P to O/P 3kVAC, O/P to Grnd 500VAC, O/P to CNT 100VAC for 1 min Isolation Resistance->100M at 25C & 70%RH, Output to Ground 500VDC Vibration (non operating)-10 - 55Hz (sweep for 1 min)19.6m/s 2 constant X, Y, Z 1 hour each plane) Immunity-EN61000-4-2, -3, -4, -5, -6, -8, -11 Safety Agency Approvals-UL60950-1, CSA60950-1, EN60950-1, EN50178, CE Mark, SEMI F47 (208VAC) Conducted & Radiated EMI-EN55011 / EN55022-B, FCC Class B Recommended EMI Filter-MC1206MC1210 Weight (Typ)g9502000 Size (WxHxD)in2.05 x 4.01 x 7.8"3.62 x 4.72 x 7.48" WarrantyyrsTwo Years Specifications Notes:(1) Derate linearly to 80% load from 115VAC to 85VAC input (derate to 90% load for SWS600-5, no derating SWS300, 600-3) SWS300/600 Series 3055 Del Sol Blvd • San Diego, CA 92154 • 1-800-LAMBDA-4 78 Revision A7: Sep 2007 HWS15-1500W Single Output, High Reliability SWS50-150W Single Output ZWS5-240W PCB style Single Output Other Lambda Industrial Products SWS300100%91.6%83.3%50% SWS600100%85%70%55% Additional derating required when operating SWS600 with side ventilation holes blocked - see installation manual. Model50°C55°C60°C65°C Derating /CO2Double sided conformal coating SuffixDescriptor Options -V AC(N) FG( ) AC(L) -V -V +V +V+V 60¡0.524 150¡0.5 21.5 SEE NOTE B 198¡1 13MAX SEE NOTE B 6.530¡0.5 52¡1 16 155¡0.5 (12.1) 15 (19.6) (8.5) 9.58.2 (95) H D K 102¡1 TERMINAL COVER SEE NOTE A VR FOR Vadj. LED 9-M3.5 (18.1) INPUT: 100-240VAC ~ 4.4A 50/60Hz N L -V-V-V MADE IN CHINA OUTPUT: 5 V 55 A +V+V+V H V ADJ BAR CODE SWS300- 5 SWS300 Outline Drawing SEE NOTE "C" (Tapped at the bottom chassis) (Tapped on both sides) SEE NOTE "C" SEE NOTE "C" (Tapped on both sides) NAME PLATE Hole at the opposite chassis ++ + NAME PLATE 150¡0.5 70¡0.5 120¡1 7-M3.5 92¡1 8-M4 50¡0.5 21 (21) (25) 25 (20) 20 10 100¡0.5 190¡1 (10) (20) 150¡0.5 20 5MAX AIR FLOW 21 34 11 9.5 21MAX 15MAX (72) 7.5 10 (73) (16.5) 9.0 8.2 ( ) TOG PC PF CNT N L AC -S +S - - H V.ADJ ON SWS600 Outline Drawing Model Selector SWS300-33.3V2.97-3.96V55402012067/70 SWS300-55V4.5-6V55402012075/78 SWS300-1212V9.6-13.2V26964812077/80 SWS300-1515V13.2-18.6V211204812079/83 SWS300-2424V20-28.8V131204815080/84 SWS300-3636V28.8-40V8.71807220082/85 SWS300-4848V40-57.6V6.72409624082/85 SWS600-33.3V2.97-3.96V 100 (2)402010069/71 SWS600-55V4.5-6V100 (2)402010074/77 SWS600-1212V9.6-13.2V50964812078/81 SWS600-1515V13.2-18.6V401204812080/83 SWS600-2424V20-28.8V251204815081/84 SWS600-3636V28.8-40V16.71807220081/85 SWS600-4848V40-57.6V12.52409624082/85 MaxLoadLineRipple AdjustCurr.RegRegNoiseEff.(3) ModelVoltageRange(A)(mV)(mV)(mV) (typ)% Notes: (2) Peak rating of 120A for 10s (3) 115/230VAC For Additional Information, please visit www.lambdapower.com/products/sws-series.htm LDU601C PRELIMINARY Conctat Res-Ingenium, +39 0763 316333 Fax +39 0763316002- or visit www.res-ingenium.com for a complete listing. GR01790 Issue: 1 Date: 04/04/2006 Rev: 2 Date: February 2007 Pag. 1/5 600W pep –27dBc min LDMOS Technology Designed for analog and digital TV transposers and transmitters, this amplifier incorporates micro-strip technology and push-pull LDMOS to enhance ruggedness and reliability. Patented bias control and matching circuit. • 470 - 862 MHz • (28 ÷32 Volt) 30 Nominal • Input/Output 50Ω - 50Ω • P out : 600W pep –27 dBc min (two-tone test 6MHz spacing ) • Gain : 13 dB min; 15 dB typ • Class AB • Devices: PTFA043002E or equivalent • Connectorized version available • No mechanical trimmers - maximizes MTBF ABSOLUTE MAXIMUM RATINGS (Device Flange T = 70 °C) Symbol Parameter Value Unit V s Voltage Supply (without RF) 35 V dc I s Current Supply 40 A dc Tstg Storage Temperature Range -20 + 80 °C Tc Operating Base Plate Temperature 1 0 + 75 2 °C ψ VSWR max 3:1 all phase angle - Max input power See note 3 - Max cw output power 400 Watt ELECTRICAL SPECIFICATIONS (Base Plate T.= 45 °C, 50Ω loaded, Vd = 30 V) Symbol Parameter Test Conditions Value Min Typ. Max Unit BW Bandwidth P out = 300 W (CW) 470 862 MHz Gp Power gain P ref = 200 W (CW) 13 15 - dB P out – 1dB Power Output @ 1dB Compression Referred to P out = 80W (CW) 4 400 550 - W I q * Quiescent Current P out = 0 W – Total * 5 - - 4.0 A I tot @ P Max 450W Ps…

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Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-1 4. TEST REPORT 4.1 RF Power Measurements Figure 4-1 shows the test equipment setup for the RF power measurements. Figure 4-1. Test Equipment Setup for RF Power Measurements The output power of the CU250ATD was adjusted to obtain 250 watts average RF output as observed on the power meter. At this power level, the final Measured Power: +14 dBm Coupling Loss: -40.0 dB Power: +54.0 dBm Power = 250 Watts With the power level properly set to 250 watts average, all required tests were performed and recorded in the following sections. CU250ATD Transmitter Hewlett Packard Power Meter Bird Model 8892-300 50 Ohm Termination Connecticut Microwave Directional Coupler EFA 2067.3004.53 8VSB Demodulator HP Spectrum Anaylzer Device Under Test Bandpass Filter Directional Coupler Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-2 4. 2 Modulation Characteristics The modulator tray incorporates a modulation technique known as 8-Level Vestigial Side-band (8-VSB), which uses a layered digital architecture and a single carrier frequency. A pilot tone is provided, to allow rapid acquisition of the signal by receivers. The 8-VSB system transmits a serial data bit stream at a rate of 19.4 Mbps in a 6 MHz television channel. This type of transmission is far less susceptible to propagation impairments such as multi-path, noise and interference as compared to analog transmissions. Figure 4-2. Typical Demodulation Test Setup CU250ATD Transmitter Directional Coupler 50 Ohm Termination HP 89441A Vector Signal Analyzer 20 dB Attenuator Laptop Computer Device Under Test EFA 2067.3004.53 8VSB Demodulator Bandpass Filter Directional Coupler Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-3 4. 3 Error Vector Magnitude (EVM) and Signal to Noise Ratio (SNR) The Hewlett Packard Vector Signal Analyzer was used to measure that the un-equalized patterns are within the ATSC/FCC EVM limit of 4% and SNR limit of 27db. Figure 4-3. Constellation Diagram Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-4 4. 4 Frequency Response Figure 4-4. Frequency Response Plot Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-5 4. 5 Peak to Average Figure 4-5. Peak to Average Plot Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-6 4. 6 Phase Noise Figure 4-6. Phase Noise Plot Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-7 4.7 Occupied Bandwidth Using the test setup in Figure 4-2, with the transmitter operating at maximum power, a photograph of the transmitter occupied bandwidth spectrum was taken and is shown in Figure 4-7. Figure 4-7. Channel Occupied Bandwidth (Pre-Filter) Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-8 4.8 Conducted Spurious Emissions The Hewlett Packard Spectrum Analyzer was used to measure harmonics before mask filter. Figure 4-8A. Out of Band Emissions Plot (Pre-Filter) The test data on the following pages demonstrates that the CU250ATD meets both the simple and stringent mask requirements. Axcera – CU250ATD Equipment Authorization Report Test Report December 2007 4-9 Simple Mask Test Data - Part 74.794 of the Rules states: (i) Simple mask. At the channel edges, emissions must be attenuated no less than 46 dB. More than 6 MHz from the channel edges, emissions must be attenuated no less than 71 dB. At any frequency between 0 and 6 MHz from the channel edges, emissions must be attenuated no less than the value determined by the following formula: A (dB) = 46 + (Df2 /1.44) (3) The attenuation values for the simple and stringent emission masks are based on a measurement bandwidth of 500 kHz. Other measurement bandwidths may be used and converted to the reference 500 kHz value by the following formula: A(dB) = Aalternate + 10 log (BWalternate / 500) where A(dB) is the measured or calc…

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