CHP8BUSD2500C25 Watt Digital Transmitter System

1 SD2500C 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................................................................2/9/00CHECKED: DMW.............................................................2/9/00RELEASED: DMW...........................................................2/9/00 Document #: DOC10-0045 REV: FEB.09.00 Figure 1: SD2500C Transmitting System. USER’S GUIDE 47266171.00-108 SD2500C Single Channel, 25 Watt Transmitter COMWAVE DIVISION 1 Warranty Information 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. Document #: DOC12-0001 REV: DEC.02.99 THOMCAST COMMUNICATIONS, COMWAVE DIVISION TWO YEAR LIMITED WARRANTY Thomcast warrants each product of its manufacture to be free from any defect in material and workmanship for a period of two years after delivery to, and return by the original purchaser. No returns, however, will be accepted unless accompanied by a written factory return authorization. The limit of liability under this warranty shall be to repair or replace any product, or part thereof, which proves to be defective after inspection by Thomcast with the exception of tubes, semiconductor devices, lamps, fuses or equipment (i.e. modulators) manufactured by others, which are subject to only such loss adjustment as Thomcast may obtain for the suppliers thereof. This warranty shall not apply to any Thomcast product which has been modified, physically or electrically damaged, or to modules which seals have been broken, or any product which has been subjected to conditions exceeding the applicable specifications or ratings or improper service techniques. Thomcast will not be liable for any direct or consequential injury, loss or damage incurred through the use, or the inability to use, any Thomcast product. Thomcast reserves the right to make design changes to any Thomcast product without incurring any obligation to make the same changes to previously purchased units. This warranty is the full extent of the obligation and liability assumed by Thomcast with respect to any and all Thomcast products. Thomcast neither makes, nor authorizes any person to make, any other guarantee or warranty concerning Thomcast products. 1 SD2500C Transmitting System Manual Table of Contents 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................................................................1/21/00CHECKED: DMW.............................................................2/16/00RELEASED: PRC..............................................................2/16/00 Document #: DOC11-0045 REV: FEB.16.00 TABLE OF CONTENTS TITLEDOCUMENT # Cover Sheet............................................................................................................DOC10-0045 Warranty Information.............................................................................................DOC12-0001 SECTION 1 Provides information describing the system and how it works Top Level Description............................................................................................DOC13-0178 Specifications.........................................................................................................47266171.00-306 SECTION 2 Provides information to assist in setting up and turning on your system Installation Procedure.............................................................................................DOC17-0035 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 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..................................…

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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 COMWAVE DIVISION April 12, 2001 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 COMWAVE DIVISION April 12, 2001 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 SD2500C, 25-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 COMWAVE DIVISION April 12, 2001 Federal Communications Commission Equipment Approval Services P.O. Box 358315 Pittsburgh, PA 15251-5315 CONFIDENTIALITY REQUEST RE: FCC I.D. CHP8BUSD2500C Gentlemen: As indicated in Section 3 of FCC Form 731, we desire to file a request for confidentiality relevant to the following schematic pages: Table 1: Driver confidential schematics. Drawing NumberDescription 47266015Broad Band RF Precorrector 47266017Broad Band RF Precorrector 47266058Microcontroller Board 33-435-01IF Linear Processor Table 2: Power Amplifier Segment confidential schematics. 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 SD2500C. 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 you have any questions regarding this request, please do not hesitate to contact 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. Document #: DOC36-0001 March 6, 2000 Federal Communicatio ns Co mmission RE: CHP8BUSD2500C, EA96660 Dear Technical Reviewer, Please accept this letter as an amendment to the certification application of the above-mentioned product. Thomcast Communications recently submitted the data to certify the equipment, now we would like to submit additional data in order to certify the equipment two ways. Our original report indicates that the equipment will operate at 2-25 watts. Using a QAM mod ulatio n sche me with three equally spaced carriers in a cha nnel the equipment will operate at 2-20 watts. The 1 dB backoff of the total power follows the well known 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 64 QAM modulation with three equally spaced carriers our transmitter is rated to 20 watts. The new data pertaining to the use of three carriers is submitted with this amendment. Please note that the output power in the original test report reads 25 watts average, which is for a single QAM modulation carrier. This field will now include 20 watts average for three equally spaced 64 QAM carriers in a single channel. Also, the label depicted in the FCC ID label/location will be changed to reflect the proper operating range accordingly. If you require more information to complete the certification of this product in the operating ranges of 2-25 and 2-20 watts, please let me know. Tha nk yo u, Paulo Correa Director of Engineering 1 Leffel, Michael, (Intermodulation Distortion in a Multi-Signal Environment), RF Design, June 1995

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. March 6, 2000 Federal Communicatio ns Co mmission RE: CHP8BUSD2500C, EA96660 Dear Technical Reviewer, Please disregard the plots I just submitted, I sent the wrong files, I’m attaching the appropriate file now. I apologize for any inconvenience. Tha nk yo u, Paulo Correa Director of Engineering

1 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 FCC CERTIFICATION REPORT FOR THE SD2500C, 25 WATT DIGITAL TRANSMITTER SYSTEM THOMCAST COMMUNICATIONS, COMWAVE DIVISION P.O. Box 69 Oakhill Road Mountaintop, PA 18707 570-474-6751 2 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 TABLE OF CONTENTS 1.0INTRODUCTION .........................................................................................................................................................3 2.0TEST EQUIPMENT......................................................................................................................................................3 3.0MEASUREMENTS .......................................................................................................................................................3
RF POWER OUTPUT..................................................................................................................................................3
MODULATION CHARACTERISTICS.........................................................................................................................3 ❖GROUP DELAY...........................................................................................................................................................8
OCCUPIED BANDWIDTH & FREQUENCY RESPONSE .........................................................................................9 ❖OCCUPIED BANDWIDTH .........................................................................................................................................9 ❖SPURIOUS EMISSIONS AT ANTENNA TERMINALS..............................................................................................11 ❖FIELD STRENGTH OF SPURIOUS RADIATION ....................................................................................................11 ❖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 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. .....................................................................................................................................................11 Table 5: Spurious Products/Harmonics Field Measurements. ...................................................................................................13 Table 6: Frequency stability over temperature. .........................................................................................................................13 Table 7: Frequency stability over AC input voltage. .................................................................................................................14 3 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 1.0INTRODUCTION This report contains all the required data for certification of Thomcast’s model SD2500C digital transmitter system. The data presented was taken from tests performed on a production transmitter system tuned to operate on ITFS channel G-4 (2680- 2686 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 followin…

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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 COMWAVE DIVISION April 11, 2001 IDENTIFICATION LABEL FCC Section 2.925, 2.926 FCC ID: CHP8BUSD2500C MODEL SD2500C 2-25 WATTS AVG POWER TRANSMITTER FCC ID: CHP8BUSD2500C MO D E L SD 25 00 C 2 - 25 WATTS AVG POWER T RAN SMITTER Figure 1: Location of FCC ID label. FCC ID: CHP8BUSD2500C MODEL SD2500C 2-25 WATTS AVG PWR TRANSMITTER

LO PLUG-IN MODULE POWER SUPPLY PLUG- IN MODULE SUB-CHASSIS UPCONVERTER PLUG-IN MODULE SIDE 1 SIDE 2 TOP

1 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. 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)2 – 25 watts 4) Power Rating: (c)(7)25 watts average 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 SD2500C 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, document # DOC14-0038 ❖ Spurious Suppression Circuits[k5]:Not applicable ❖ Describe Limiters: Modulation: Not applicable Power: See technical manual, document # DOC13-0177

1 Microwave Precorrector Module – 47266073 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: AAC................................................................01/31/00CHECKED: KAS...............................................................02/02/00RELEASED: PRC.............................................................2/11/00 Document #: DOC13-0177 REV: FEB.02.00 MICROWAVE PRECORRECTOR MODULE Built in a 3” X 6” housing, this module consists of two compartments: a RF and DC & Control section; they are placed in opposite sides of the housing. Two harnesses, a seven and ten conductor, reach the interior of the module on the control side. RF Section: This section is implemented essentially by microwave broadband amplifiers (U1-U4 and U6-U7) and hybrids (HYB1-HYB7). All amplifiers are biased through resistors from the only power supply voltage and use quarter-wavelength transformers and a capacitor for de-coupling. DC and Control Section: A variety of electronic components are used to control the RF signal processing that takes place in the RF section. Externally accessible potentiometers and switches allow adjustments and changes in the module modes of operation. Correction is performed by subtraction of a pre-generated distortion from the one present at the output of the system. A RF input signal at about 0dBm-power level is applied to J1. This signal is amplified and split two ways; one goes through a linear path while the other goes through the circuitry that generates the desired pre-distortion. Both signals are combined and amplified to recover the losses of their processing. Finally, the signal goes through the broadband attenuator that performs the ALC and is routed out the module through J2. Table 1 summarizes each control accessible from the top of the module. Module control through external voltages delivered via connector P2 is also possible. Table 1: Microwave precorrector adjustment controls. NUMERICAL REFERENCE NAMEFUNCTION 1J1RF Input 2J2RF Output 3AUTO / MAN SwitchSets the power control mode 4D.G.Control for pre-distortion signal amplitude 5CANC1Module internal cancellation adjustments 6CANC2Module internal cancellation adjustments 7PH. ADJAdjust the phase of the pre-distortion 8AUTOAdjust output power in ALC mode 9MANAdjust output power in manual mode 10PWR LMTRAdjust maximum output power achievable by the system 11PC ON / OFFSets pre-correction On or Off 12P1+12V, ALC voltage (connector) 13P2External voltages for adjustments (connector) 2 Microwave Precorrector Module – 47266073 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: AAC................................................................01/31/00CHECKED: KAS...............................................................02/02/00RELEASED: PRC.............................................................2/11/00 Document #: DOC13-0177 REV: FEB.02.00 93810 211312 115674 Figure 1: 47266073 microwave precorrector. Table 2: DOC19-0119, REV P1. ParameterSpecificationNotes/Test Conditions RF Gain-8 dB min / 3 dB max1.8 to 3.6 GHz (function of ALC) Input Return Loss< -10 dB1.8 to 3.6 GHz Total Flatness ± 3 dB 1.8 to 3.6 GHz Power LimiterPmax = nominal power +1 dB ALC on or off Distortion Generation-60 dBc to -32 dBc1.8 to 3.6 GHz 1 carrier, 64 QAM, spectrum analyzer @ 100 KHz RBW Cancellation>25 dBc1.8 to 3.6 GHz 1 carrier, 64 QAM, spectrum analyzer @ 100 KHz RBW Phase Range>45º adjustment1.8 to 3.6 GHz DC Power Supply 12 ± 0.5 V Current.6 AS21 = 2dB; Maximum pre-distortion GENERAL Impedance / Connector Input Output 50 O / Female SMA 50 O / Female SMA Operating Temperature0° C to 50° C ù ù SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

1 LO Plug-In Module Theory of Operation - 47266183 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: DMW..............................................................2/02/00CHECKED: KAS...............................................................2/02/00RELEASED: DMW...........................................................2/02/00 Document #: DOC14-0038 REV: FEB.02.00 LO PLUG-IN MODULE THEORY OF OPERATION The LO plug-in module consists of a microwave synthesizer, microcontroller board, distribution board, and display board. It determines the microwave upconverter mixer input and transmitter output operating frequency. The operating frequency is determined by programming of the phase locked loop frequency synthesizer. Miniature DIP switches SW1 and SW2 set N counter and A counter PLL programming inputs. A 10 MHz input reference signal 3 determines the frequency stability of the PLL, see Figure 2 for numerical reference. Figure 1: LO plug-in module. The synthesizer module uses a microwave prescaler, dual modulus prescaler, and internal dividers to reduce the 10 MHz reference and microwave voltage controlled oscillator (VCO) frequencies to 25 kHz for the 09-049 series and 09-093 version; 125 KHz for the 09-073 series, 09-097 & 09-098 versions; or 200 KHz for the 09-092 version. These signals are applied to separate inputs of a phase detector. Input signals of equal phase generate no change in output. Should the VCO deviate in frequency, a phase shift is detected causing an integrator/low pass filter to generate a DC control voltage proportional to the offset frequency. This control voltage is applied to the microwave VCO to return it to the selected frequency. The microwave local oscillator frequency is derived by adding (or subtracting in certain cases) the desired transmitter channel frequency to the incoming IF frequency: EXAMPLE: Visual Output Frequency+Visual IF=Microwave LO Frequency 2501.25 MHz+45.75 MHz=2547 MHz Aural Output Frequency+Aural IF=Microwave LO Frequency 2505.75 MHz+41.25 MHz=2547 MHz 2 LO Plug-In Module Theory of Operation - 47266183 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: DMW..............................................................2/02/00CHECKED: KAS...............................................................2/02/00RELEASED: DMW...........................................................2/02/00 Document #: DOC14-0038 REV: FEB.02.00 FRONT AND REAR PANEL DESCRIPTIONS Front panel Refer to Figure 1 for numerical references. 1) CHANNEL SELECTION INDICATOR: Not applicable in this model. 2) PROGRAMMING KEYPAD: Not applicable in this model. 3) LO SAMPLE: Not applicable in this model. 4) LO OUTPUT: Provides LO Drive to the upconverter plug-in module. 5) COMM PORT: Phone jack connector from the RS 485 Board used for communication to ComView Network. Not applicable in this model. 6) LED DISPLAY PANEL: a) DC POWER: Indicates that +12V DC Power is present to the module. i) GREEN = power present ii) UNLIT = no power – denotes a problem b) LO LEVEL: Not applicable in this model. c) UHF LEVEL: Not applicable in this model. d) REFERENCE: Not applicable in this model. 5 4 3 2 1 6 6 7 8 8 Figure 2: LO plug-in front panel. e) LO ∅ LOCK: Indicates phase lock of the synthesizer or DRPLO module. i) UNLIT = phase lock present ii) RED = loss of phase lock f) UHF ∅ LOCK: Not applicable in this model. 7) HANDLE: Assists in removing module from sub chassis. 8) THUMBSCREWS: Secure module to the sub-chassis and provide a reliable ground connection; loosen to remove module for replacement or repair. 3 LO Plug-In Module Theory of Operation - 47266183 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: DMW..............................................................2/02/00CHECKED: KAS...............................................................2/02/00RELEASED: DMW...........................................................2/02/00 Document #: DOC14-0038 REV: FEB.02.00 Refer to Figure 2 for numerical references. 1) 48 PIN DIN: Interface to the back plane, (all power, control and diagnostics) 2) GROUND / ALIGNMENT STUD: Ensures that proper ground is made prior to engaging the 48 pin DIN; also aids in the alignment of the module within the sub-chassis. 3) FREQ REFERENCE INPUT: Male 50O blind mate provides interface to the back plane and allows passage for the 10 MHz reference signal. 4) Not applicable in this model. 5) Not applicable in this model. 6) Not applicable in this model. 5 2 1 6 4 3 Figure 3: LO plug-in rear panel.

1 SDxxxxC Transmitter Series Top Level Description 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................................................................1/30/00CHECKED: PRC...............................................................1/31/00RELEASED: PRC.............................................................2/10/00 Document #: DOC13-0178 REV: FEB.01.00 TOP LEVEL DESCRIPTION The high power single channel (HPSC) transmission system generates a digitally modulated average power signal on all MDS, MMDS, and ITFS channels. The SD2500C generates 2-25 watts average power while the SD5000C generates 5-50 watts average power 1 . The system architecture is based on advanced transistor technology, low loss power combining, and distributed control and power conversion. Some unique advantages of this new design are flexibility/scalability, lower downtime, and lower operating costs. The modular structure of this system allows for quick and easy replacement of malfunctioning plug-in modules, which means less downtime and convenient scalability. The high efficiency design and small size decreases operating expenses. The transmitting system consists of a sub-chassis, upconverter plug-in module, LO plug-in module, power supply plug-in module,…

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