CHP8BUSD1250C1-12.5 Watts Average Power Transmitter

1 SD1250C Transmitting System Manual COMWAVE DIVISION All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. CREATED: KAS................................................................06/09/00CHECKED: DMW.............................................................06/09/00RELEASED: PRC..............................................................06/09/00 Document #: DOC33-0050 REV: JUN.09.00 Figure 1: SD1250C Transmitting System. This is an unpublished work protected by United States copyright laws and is proprietary to Thomcast Communications, Inc. Disclosure, copying, reproduction, merger, translation, modification, enhancement or use by anyone other than authorized employees or licensees of Thomcast Communications, Inc. without the prior written consent of Thomcast Communications, Inc. is prohibited. Copyright (c) 2000 Thomcast Communications, Inc. All rights reserved This copyright notice should not be construed as evidence of publication. USER’S GUIDE 47266360.00-108 SD1250C Single Channel, 12.5 Watt Transmitter COMWAVE DIVISION 2 SD1250C Transmitting System Manual COMWAVE DIVISION All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. CREATED: KAS................................................................06/09/00CHECKED: DMW.............................................................06/09/00RELEASED: PRC..............................................................06/09/00 Document #: DOC33-0050 REV: JUN.09.00 TABLE OF CONTENTS TITLEDOCUMENT # Warranty Information ...................................................................................................DOC12-0001 SECTION 1 Provides information describing the system and how it works Top Level Description ..................................................................................................DOC13-0178 Specifications ...............................................................................................................47266360.00-306 SECTION 2 Provides information to assist in setting up and turning on your system Installation Procedure ...................................................................................................DOC17-0035 Safety Practices and Guidelines ...................................................................................DOC26-0031 Cabling .........................................................................................................................DOC17-0036 External Interconnections .............................................................................................DOC30-0043 ComView Status Monitoring Interconnections ............................................................DOC30-0005 Turn-On Procedure .......................................................................................................DOC26-0050 SECTION 3 Provides information to help with troubleshooting Recommended Test Equipment ....................................................................................DOC25-0007 Troubleshooting ............................................................................................................DOC18-0073 Node Addresses ............................................................................................................DOC22-0019 Troubleshooting Worksheet .........................................................................................DOC18-0072 Equipment Fusing and Protection .................................................................................DOC18-0075 Power Supply Plug-In Fusing and Protection ...............................................................DOC18-0071 Maintenance .................................................................................................................DOC18-0074 Inspections and Cleaning Calibrations ..................................................................................................................DOC16-0057 SECTION 4 Provides information about individual segments of the system. We recommend you contact Thomcast 1 customer service when repairs are necessary; please do not attempt to repair any modules and/or boards by yourself. Sub-Chassis Theory of Operation .................................................................................DOC14-0037 Microcontroller Board Description (hardware) ............................................................DOC13-0175 Upconverter Plug-In Module Theory of Operation ......................................................DOC14-0039 Front and Rear Panel Descriptions Specifications ...............................................................................................................47266116.00-306 Block Diagram ..............................................................................................................47266116.00-034 Microwave Precorrector Module...................................................................................DOC13-0177 Internal Interconnect .....................................................................................................47266116.00-050 1 DOC20-0001 provides detailed contact information. International phone 001-570-474-6751, USA & Canada phone 1-800-266-9283. 3 SD1250C Transmitting System Manual COMWAVE DIVISION All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. CREATED: KAS................................................................06/09/00CHECKED: DMW.............................................................06/09/00RELEASED: PRC..............................................................06/09/00 Document #: DOC33-0050 REV: JUN.09.00 U/C Plug-In Module MCU State Machine, Firmware Description ..........…

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All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountaintop, PA 18707 570-474-6751; FAX 570-474-5469 COMW AV E DIV ISIO N June 9, 2000 CERTIFICATION OF DATA FCC Section 2.909 (d) Having personally conducted the tests contained in this report, I certify that the statements and data submitted are true and correct to the best of my knowledge. Paulo Correa Director of Engineering Thomcast Communications, Comwave Division

All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountaintop, PA 18707 570-474-6751; FAX 570-474-5469 COMW AV E DIV ISIO N June 9, 2000 Federal Communications Commission Equipment Approval Services P.O. Box 358315 Pittsburgh, PA 15251-5315 Gentlemen: The enclosed form and engineering report are submitted for certification of Thomcast's model SD1250C, 12-watt digital transmitter system for television transmission under parts 2, 21, and 74 of the FCC rules. Enclosed are an engineering report with required test results and a technical manual with circuit diagrams/theory of operation. If further information is required, please contact me at (570) 474-6751. Sincerely, Paulo Correa Director of Engineering Thomcast Communications, Comwave Division PC/kas All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountaintop, PA 18707 570-474-6751; FAX 570-474-5469 COMW AV E DIV ISIO N June 9, 2000 Federal Communicatio ns Co mmission Equipment Approval Services P.O. Box 358315 Pittsburgh, PA 15251-5315 CONFIDENTIALITY REQUEST RE: FCC I.D. CHP8BUSD1250C Gentle me n: As indicated in Section 3 of FCC Form 731, we desire to file a request for confidentiality relevant to the follow ing sche matic pa ges: Table 1: Driver confide ntial sche matics. Drawing NumberDescription 47266015Broad Band RF Precorrector 47266017Broad Band RF Precorrector 47266058Microcontroller Board 33-435-01IF Linear Processor Table 2: Power Amplifier Segment confidential sche matics. Drawing NumberDescription 32-002-01DC-DC converter PCB for the PS module 34-010-01Microcontroller PCB for the PS module The schematic pages are attached to this report for submission to the FCC for review with our Application for Equipment Authorization as per FCC CRF Section 0.459. This request is being made due to the competitive nature of the ITFS/MMDS industry and the new level of technology used in the microcontroller interface, RF precorrector, IF linear processor, & power amplifier segment of our model SD1250C. Our technical manual provides our customer with a substantial amount of information. Therefore, we feel it would be in the best interest of Thomcast that the aforementioned schematics, which are not included in the technical manual, be kept confidential. Your consideration of this request would be greatly appreciated. If yo u have a ny q uestio ns regarding this request, please do not hesita te to co ntac t me. Respectfully, Paulo Correa Director of Engineering Thomcast Communications, Comwave Division PC/kas

1 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. EXTERNAL PHOTOS Figure 1: SD1250C transmitting system......................................................................................................................... 1 Figure 2: Sub-chassis rear panel..................................................................................................................................... 2 Figure 3: Power supply plug-in module front panel....................................................................................................... 2 Figure 4: Power supply plug-in module rear panel. ....................................................................................................... 2 Figure 5: LO plug-in module front panel. ...................................................................................................................... 3 Figure 6: LO plug-in module rear panel......................................................................................................................... 3 Figure 7: Upconverter module front panel. .................................................................................................................... 3 Figure 8: Upconverter module rear panel....................................................................................................................... 3 Figure 9: Power amplifier segment front panel. ............................................................................................................. 4 Figure 10: Power amplifier segment rear panel.............................................................................................................. 4 Figure 1: SD1250C transmitting system. 2 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. Figure 2: Sub-chassis rear panel. Figure 3: Power supply plug-in module front panel.Figure 4: Power supply plug-in module rear panel. 3 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. Fig ure 5: LO pl ug-i n mo dule front pa ne l. Fig ure 6: LO pl ug-i n mo dule re ar pa ne l. Figure 7: Upconverter module front panel. Figure 8: Upconverter module rear panel. 4 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. Figure 9: Power amplifier segment front panel. Figure 10: Power amplifier segment rear panel.

All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountaintop, PA 18707 570-474-6751; FAX 570-474-5469 COMW AV E DIV ISIO N June 9, 2000 IDENTIFICATION LABEL FCC Section 2.925, 2.926 FCC ID: CHP8BUSD1250C MODEL SD1250C 1- 12 .5 WA TTS AV G POWER T RA NSMITTE R FCC ID: CHP8BU SD1250C M O DE L SD 1250C 1 - 12.5 W AT TS AVG P OW ER T RANS MIT TER NOTE: When using a QAM modulation scheme with 3 carrie rs the average pow er will be 1-10 watts. Figure 1: Location of FCC ID label. FCC ID: CHP8BUSD1250C MODEL SD1250C 1-12.5 WATTS AVG PWR TRANSMITTER

1 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. OPERATIONAL DESCRIPTION DESCRIPTION OF EQUIPMENT FCC Section 2.1033 1) Type of Emission: (c)(4)64/256 QAM; 6M00D7W 2) Frequency Range: (c)(5)2000-2700 MHz in select bands 3) Operating Range: (c)(6)1 – 12.5 w atts; 1 - 10 watts 4) Power Rating: (c)(7)12.5 watts average QAM modulation; 10 watts average QAM modulation with three equally spaced 2 MHz carriers 5) Variation of output power (c)(6)See calibration section, document # DOC16-0057 of technical manual 6) E & I on Final: (c)(8) Drain voltage 10V Drain current 7A each 7) Tune-up Procedures: (c)(9)See calibration section, document # DOC16-0057 of technical manual 8) Function of Active Devices: (c)(10) A list of active devices in the RF chains of the SD1250C transmitter can be found in the tune-up section. The relative position of each device may be found by referring to the block diagrams and schematics found in the technical manual. ❖ Frequency Stability Devices:See technical manual, docume nt # DOC14-0038 ❖ Spurious Suppression Circuits[k5]: Not applicable ❖ Describe Limiters: Modulation: Not applicable Power: See technical manual, document # DOC13-0177

1 Tune-Up Information COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PARTS LIST/TUNE UP INFO Table 1: List of active devices. UPCONVERTER PLUG-IN - 47266116.01 W Precorrector Module 47266073IF Linear Processor Module 47266081.01 Board 47266015Board 33-435-01 U1, U7Monolithic AmpD1 - D4, D7, D8 Pin Diodes U2, U3, U4Monolithic AmpU1IF Amplifier U6Monolithic AmpD5, D6Schottky Diodes D1 - D7Pin DiodeQ3 - Q6Transistors D8, D9Varactor Diode Intermediate Power Amplifier Module 47266077W Converter Module 47266075 Board 47266019Board 47266013 Q1, Q2GaAs FETU1Mixer U2Mo nolithic A mp U4, U5Mo nolithic A mp U8, U9Log Amp U11, U12Power Amp MMIC DETECTOR MODULE- 47266119 Board 47266141 U2, U4Log Amp Detectors LO PLUG-IN - 47266183.01 Synthesizer Module 09-073-02 Board 35-063-02Board 33-291-02 U1Dual Modulus PrescalerU1Voltage Controller Oscillator U2SynthesizerU2RF Amplifier U3ComparatorU3Operation Amplifier U4RegulatorU4Microwave Prescaler U5, U7DividersU65 V Voltage Regulator U6Operational AmplifierU7Shunt Regulator POWER AMPLIFIER SEGMENTS - 04-333-02 Board 40-240-02 U1SPDT Switch D1 - D3Diodes Q1 – Q5GaAs FET

-1 - Tue Feb 15 13:33:34 2000 -1 - Tue Feb 15 13:45:57 2000 -1 - Thu Dec 09 09:43:15 1999 -1 - Tue Feb 15 13:49:41 2000

1 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountaintop, PA 18707; 570-474-6751; FAX 570-474-5469 FCC CERTIFICATION REPORT FOR THE SD1250C, 12.5 WATT DIGITAL TRANSMITTER SYSTEM THOMCAST COMMUNICATIONS, COMWAVE DIVISION P.O. Box 69 Oakhill Road Mountaintop, PA 18707 570-474-6751 2 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountaintop, PA 18707; 570-474-6751; FAX 570-474-5469 TABLE OF CONTENTS 1.0INTRODUCTION ...........................................................................................................................................................3 2.0TEST EQUIPMENT .......................................................................................................................................................3 3.0MEASUREMENTS .........................................................................................................................................................3 !RF POWER OUTPUT ...................................................................................................................................................3 !MODULATI ON CHARACTERISTICS..........................................................................................................................3 ❖GROUP DELAY ............................................................................................................................................................8 !OCCUPIED BANDWIDTH & FREQUENCY RESPONSE ..........................................................................................9 ❖OCCUPIED BANDWIDTH...........................................................................................................................................9 ❖SPURIOUS EMISSIONS AT ANTENNA TERMINALS ...............................................................................................11 ❖FIELD STRENGTH OF SPURIOUS RADIATION .....................................................................................................12 ❖FREQUENCY STABILITY...........................................................................................................................................13 4.0 SUMMARY..........................................................................................................................................................................14 TABLE OF FIGURES Figure 1: 64-QAM Constellation Diagram....................................................................................................................................4 Figure 2: Digital modulation occupancy. ......................................................................................................................................6 TABLE OF PLOTS PLOT 1: Demodulation performance of the 64 QAM transmitter. ...............................................................................................7 PLOT 2: Demodulation performance of the 256 QAM transmitter. .............................................................................................7 PLOT 3: Frequency response and group delay of the 64 QAM transmitter. ................................................................................8 PLOT 4: Frequency response and group delay of the 256 QAM transmitter. ..............................................................................9 PLOT 5: Occupied bandwidth of the 64 QAM transmitter. ........................................................................................................10 PLOT 6: Occupied bandwidth of the 256 QAM transmitter. ......................................................................................................10 PLOT 7: Occupied bandwidth of the QAM modulation with three equally spaced 2MHz carriers...........................................11 TABLE OF TABLES Table 1: Quadrant Conversion Constellation. ...............................................................................................................................4 Table 2: MMDS Digital Transmission Format..............................................................................................................................5 Table 3: 64/256 QAM Modulator RF Output................................................................................................................................5 Table 4: Spurious emissions........................................................................................................................................................12 Table 5: Spurious Products/Harmonics Field Measurements......................................................................................................13 Table 6: Frequency stability over temperature............................................................................................................................14 Table 7: Frequency stability over AC input voltage....................................................................................................................14 3 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountaintop, PA 18707; 570-474-6751; FAX 570-474-5469 1.0INTRODUCTION This report contains all the required data for certification of Thomcast’s model SD1250C digital transmitter system. The data presented was taken from tests performed on a production transmitter system tuned to operate on ITFS channel C-4 (2584- 2590 MHz) designed to transmit any one of 31 ITFS/MMDS television channels, in the MDS and ITFS bands. Other information required for Certificat…

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COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountain Top, PA 18707 570-474-6751 or 1-800-266-9283 FAX 570-474-5469 1.0INTRODUCTION This report contains all the required data for certification of Thomcast’s model SD1250C digital transmitter system. The data presented was taken from tests performed on a production transmitter system tuned to operate on ITFS channel C-4 (2584-2590 MHz) designed to transmit any one of 31 ITFS/MMDS television channels, in the MDS and ITFS bands. Other information required for Certification, such as circuit diagrams and descriptions, photographs, tune-up and maintenance procedures, and the technical manual are attached. 2.0TEST EQUIPMENT FCC Section 2.947 (d) The following is a list of major test equipment, which was used in testing the transmitter for this report: 1. Spectrum AnalyzerHP Model 8564E & 8593E 2. Power MeterHP Model 436A 3. Frequency CounterHP Model 5350B 4. Digital MultimeterFluke Model 87 5. Vector Signal AnalyzerHP 89441A 6. Digital Transmission AnalyzerHP 3784A 3.0MEASUREMENTS FCC Section 2.1033 (c)(14) ! RF POWER OUTPUT FCC Section 2.1046 (a) (c) Output Power:12.5 watts average QAM modulation; 10 watts average QAM modulation with three equally spaced 2 MHz carriers Method of Measurement:Per FCC 2.1046 (b) The transmitter was operated into a dummy load of substantially zero reactance with a resistance equal to the transmission line characteristic impedance. Average power was directly measured using an HP 436A microwave power meter. The transmitter’s % power meter was found to be within 2% of the indications provided by the external average power meter with output variations of 80% to 110% of the transmitter’s rated output. Outp ut Pow er CalibrationSee technical manual, docume nt # DOC16-0057 ! MODULATION CHARACTERISTICS FCC Section 2.1047 The digital modulation format is Quadrature Amplitude Modulation with a 64 or 256 point signal constellation (64 QAM and 256 QAM) with the QAM symbol rate and occupied bandwidth optimized for a 6 MHz channel plan. Forward Error Correction (FEC) uses a concatenated coding approach that produces high coding gain at moderate complexity and overhead. The system FEC is optimized for quasi-error free operation at a threshold output error event rate of one error per 15 minutes. To achieve the appropriate level of error protection required for transmission of digital data, an FEC based on Reed- Solomon coding is used. Protection against burst errors is achieved by use of byte interleaving. 3 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountain Top, PA 18707 570-474-6751 or 1-800-266-9283 FAX 570-474-5469 PLOT 1: Frequency response and group delay of the 256 QAM transmitter. ! OCCUPIED BANDWIDTH & FREQUENCY RESPONSE FCC Section 2.1049 (e) (6) (i) See the above plots for frequency response data. ❖ OCCUPIED BANDWIDTH FCC Section 2.1047/2.1049/73.687 (a) (2)/74.936 Plots five and six demonstrate the occupied bandwidth of the QAM signal at the output of the system channel combiner at the maximum rated average power and symbol rate. The occupied bandwidth complies with the revised spectral mask per the FCC ruling. The signal meets the requirements of a sidelobe power spectral density less than –38 dB at the channel edge decreasing to less than –60 dB at ±3 MHz from the channel edge relative to the average power spectral density of the QAM signal within the main channel. Plot seven demonstrates the occupied bandwidth of the 64 QAM modulation with three equally spaced carriers. The additional 1 dB backoff show n in plot seven follow s the well know n requirements for multi-carrier systems. Specifically, Leffel 1 cites results showing the backoff requirement of 1 dB when signals are increased from two to three carriers. Our laboratory test results reflect the backoff requirement predicated by Leffel. That requirement is incorporated in the rated output power of our transmitter, therefore, using the QAM modulation with three equally spaced 2 MHz carriers our transmitter is rated to 10 watts. Each occupied bandwidth plot is labeled corresponding to the respective modulation format. 1 Leffel, Michael, (Intermodulation Distortion in a Multi-Signal Environment), RF Design, June 1995 9 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountain Top, PA 18707 570-474-6751 or 1-800-266-9283 FAX 570-474-5469 PLOT 2: Occupied bandwidth of the 64 QAM transmitter. PLOT 3: Occupied bandwidth of the 256 QAM transmitter. 10 COMW AV E DIV ISIO N All information contained in this document is confidential and proprietary to THOMCAST and shall not be disclosed without the prior written permission of THOMCAST. PO Box 69, 395 Oakhill Road, Mountain Top, PA 18707 570-474-6751 or 1-800-266-9283 FAX 570-474-5469 PLOT 4: Occupied bandwidth of the QAM modulation with three equally spaced 2MHz carriers 2 . ❖ SPURIOUS EMISSIONS AT ANTENNA TERMINALS FCC Section 2.1051/2.1057/21.908 (b)/74.936 Average Output Power:12.5 watts average QAM modulation; 10 watts average QAM modulation with three equally spaced 2 MHz carriers Type Modulation:64/256 QAM Spectrum Analyzer Setting:The Spectrum Analyzer setting used in conducting the spurious emissions test at the equipment outp ut terminals was as follows Frequency Span:2 MHz per Division Center Frequency:Adjusted continuously for 10 MHz to 27 GHz Resolution Bandwidth:100 KHz Video Filter:Out Input Attenuator Setting:Input level was set for a full-scale calibration of the average digital power. All other frequencies we…

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