CHP8BUSD2500B25 watt digital transmitter system

38 SD2500 TECHNICAL 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...................................................................12/9/99CHECKED: DMW................................................................12/9/99RELEASED: PRC..................................................................12/9/99 Document #: DOC33-0040 REV: DEC.09.99 5. Close the 4-pack master box and seal the top seam with 2” clear box tape, using three layers to assure strength. Then put 4 pieces of fiberglass strapping tape over the edges. Clearly mark the RA number on the outside of the box before shipping. Figure 21: Power amplifier segments ready to ship. 37 SD2500 TECHNICAL 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...................................................................12/9/99CHECKED: DMW................................................................12/9/99RELEASED: PRC..................................................................12/9/99 Document #: DOC33-0040 REV: DEC.09.99 RETURN PACKAGING OF THE POWER AMPLIFER SEGMENT 1. Start with an empty power amplifier segment box, shown in Figure19. If you don’t have one please inform Comwave customer service when you contact them for a return authorization (RA) number, which you MUST do prior to returning ANY equipment. 2. Place the power amplifier segment into the box, as shown in Figure20. The heatsink should always face up and the connectors on the rear of the power amp segment rest against the soft gray foam for protection. Figure 19: Empty power amplifier segment box. HEATSINK REAR Figure 20: Boxed power amplifier segment. 3. Fold the edges of the inner box in and close. 4. Place the inner box into the 4-pack master (outer box), being sure to include three empty power amplifier boxes for a secure fit, as shown in Figure21. The power amplifier segments are generally packed 4 per master box and shipped. When returning segment(s) please pack them the same way, ALL boxes will be returned to you. If you need to assemble a master box, use 2” clear box tape over the bottom seam, using three layers to assure strength. Then put 4 pieces of fiberglass strapping tape over the edges. 36 SD2500 TECHNICAL 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...................................................................12/9/99CHECKED: DMW................................................................12/9/99RELEASED: PRC..................................................................12/9/99 Document #: DOC33-0040 REV: DEC.09.99 RETURN PACKAGING Below is a pictorial view of the following steps. 1) Begin with an empty Thomcast box, if you don’t have one please inform customer service when you contact them for a return authorization (RA) number, which you MUST do prior to returning ANY equipment. NOTE: A box consists of 4 parts, one cardboard box, one cardboard tube, and two polyethylene endcaps. a) To assemble a flattened box put three 23 layers of 2” clear box tape over the bottom seam, then position four pieces of fiberglass strapping tape over the edges. 2) Put the cardboard tube in the box. 3) Place the polyethylene endcaps against the sides of the equipment. NOTE the front panel fits snuggly into a slotted opening in the endcap. 4) Put the chassis in the box. 5) Close the box and seal the top seam with three layers of 2” clear box tape, then position four pieces of fiberglass strapping tape over the edges. 6) Affix a shipping label to the box see DOC20-0001, preceding this document, for shipping address. 7) Mark the RA number on the outside of the box before shipping. If the RA number is not clearly visible Thomcast cannot be held responsible for delays in repair and return time. EMPTY BOX. CARDBOARD BOX CARDBOARD TUBE POLYETHYLENE ENDCAPS BOX PARTS. CARDBOARD TUBE PLACING THE CARDBOARD TUBE. REAR FRONT SLOTTED OPENING PLACING THE ENDCAPS. PACKED CHASSIS. Figure 18: Equipment packing. 23 Using several layers of tape assures the strength of the box. 35 SD2500 TECHNICAL 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...................................................................12/9/99CHECKED: DMW................................................................12/9/99RELEASED: PRC..................................................................12/9/99 Document #: DOC33-0040 REV: DEC.09.99 CUSTOMER SERVICE DOC20-0001 CONTACT INFORMATION DURING BUSINESS HOURS Inquiries may be directed to Thomcast Communications, Comwave Division during business hours, 8 am to 5 pm Monday through Friday. When the automated attendant answers you will be given the option of dialing your party direct or speaking with the operator. AFTER BUSINESS HOURS If you need emergency assistance due to equipment shutdown or malfunction, customer support personnel are available 24 hours a day. Call Thomcast at one of the numbers listed below; when the automated attendant answers press 6, leave your name, company name, phone number, equipment model number(s), and a brief description of the problem you’re encountering. When you hang up the system will automatically page the on-call technician who will then return your call in a timely manner. You can listen to the message prompt for other options as well, however, for emergency assistance you MUST use option 6. Thomcast Communications, Comwave Division Crestwood Industrial Park, 395 Oakhill Road Mountaintop, PA 18707 1-800-266-9…

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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 May 7, 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 SD2500, 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 May 7, 2001 Federal Communications Commission Equipment Approval Services P.O. Box 358315 Pittsburgh, PA 15251-5315 CONFIDENTIALITY REQUEST RE: FCC I.D. CHP8BUSD2500B 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 40-226-01Broad Band RF Precorrector 40-227-01Broad Band RF Precorrector 34-011-01 (uses the 34-010-01 schematic)Microcontroller 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 SD2500. 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

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 May 7, 2001 IDENTIFICATION LABEL FCC Section 2.925, 2.926 FCC ID LABEL FCC ID: CHP8BUSD2500B MODEL SD2500 2 - 25 WATTS AVG PWR TRANSMITTER Figure 1: Location of FCC ID label. FCC ID: CHP8BUSD2500B MODEL SD2500 2-25 WATTS AVG PWR TRANSMITTER

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 # DOC16-0003 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 # DOC16-0003 of technical manual 8) Function of Active Devices: (c)(10) The following is a list of active devices in the RF chains of the SD2500 transmitter. 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 # DOC13-0170 ❖ Spurious Suppression Circuits[k5]:Not applicable ❖ Describe Limiters: Modulation: Not applicable Power: See technical manual, document # DOC13-0062 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. TOP LEVEL DESCRIPTION DOC13-0168 The SD2500 high power single channel (HPSC) transmission system generates a digitally modulated 25-Watt average power signal on all MDS, MMDS, and ITFS channels. 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 the power amplifier segments allows hot replacement, which means less downtime and convenient scalability. The high efficiency design and small size decreases operating expenses. The SD2500 consists of a rack, sub-rack, digital driver, and power amplifier segments. Digital transmission techniques provide superior performance over analog methods, with reduced susceptibility to noise and co-channel interference. Advanced quadrature amplitude modulation provides exceptional throughput and spectral efficiency. The RF signal path of the system is shown below in Figure3. For more detail refer to the block diagram of the rack, document # DOC15- 0009 found in this manual. The HPSC Series of transmitters is available in both upgradeable and non-upgradeable models. A non-upgradeable model provides maximum space efficiency, where, the modular system architecture of an upgradeable model allows it to be easily upgraded from 10 to 200 Watts in 25-Watt increments. Similarly, it may also be downgraded; and, the power amplifier segments may be used elsewhere or kept as spares for hot replacement. As the output power is modified, the model name will change respectively, refer to Table 1 below. The Federal Communications Commission Identifier (FCC ID) will also be altered corresponding to the new model and power level. A new front panel label is needed to accommodate each FCC ID. The label is located on the digital driver as shown in Figure4, and will be replaced with each upgrade as needed. In order to maximize power density, both the rack and the sub-rack are integral subsystems of the transmitter design. The rack provides either phase-to-phase or three-phase AC power to the transmitters, DC power to the sub-rack, and the cooling for the power amplifier segments. Similarly, the sub-rack provides an interface between the power amplifier segments and the entire system. Figure5 illustrates the distribution of AC and DC power throughout one transmitter in the system One of the most prevalent user benefits of the High Power Single Channel Series of transmitters is hot replacement. Should a Power Amplifier Segment fail, hot replacement allows the transmitter to continue operating with only slight power loss and little to no change in the noise floor. Table 1: Model names, output power, & FCC ID. Model NameOutput PowerFCC ID SD25002 to 25 WattsCHP8BUSD2500B SD500010 to 50 WattsCHP8BUSD5000B SD1000020 to100 WattsCHP8BUSD10000 SD1500030 to 150 WattsCHP8BUSD15000 SD2000040 to 200 WattsCHP8BUSD20000 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. SPLITTER POWER AMPLIFIER SEGMENTS [1 TO N] DRIVER COMBINER OUTPUT COUPLER Figure 1: System RF signal path. 4 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. FCC ID LABEL FCC ID: CHP8BUSD2500B MODEL SD2500 2 - 25 WATTS AVG PWR TRANSMITTER Figure 2: Location of FCC ID label. FIGURE 13-0044-3 DC POWER FANS DRIVER MAIN POWER SUPPLY 48 V DC SECONDARY POWER SUPPLY 10 V DC Ø A Ø B Ø C Ø N AC POWER Figure 3: AC and DC power distribution. 5 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. DIGITAL DRIVER THEORY OF OPERATION DOC14-0035 The digital driver transmitter receives a digitized intermediate frequency signal typically at -15 dBm, which is upconverted to an S-band frequency. The transmitter is capable of providing an output of 1.25 W average power. Refer to the block diagram for the RF signal path. The IF signal being received is sent to an IF linear processor pre-correcting for frequency response, group delay, and detection of IF presence. The IF linear processor output is applied to a mixer/amplifier module where it is mixed with a microwave local oscillator. A bandpass filter follows the mixer to prevent out-of-band products from being amplified and transmitted. The filtered mixer/a…

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1 Title, 10 pt bold, italic 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................................................................5/6/99CHECKED: NAME ........................................................... DATERELEASED: NAME.......................................................... DATE Document #: DOC0x-xxxx REV: xxx PARTS LIST/TUNE UP INFO Table 1: List of active devices. DRIVER RF PrecorrectorModule 04-299-02 Board 40-226-01 U1-U3RF Amplifiers D1, D2Diodes Board 40-227-01 U1, U2RF Amplifiers U3Regulator U4OP Amplifiers Q1 – Q4Transistors D1 – D8Diodes Final AmplifierModule 04-292-02 Board 40-202-01 Q1GaAs FET Phase Locked Crystal OscillatorModule 09-067-02 XPCRO-2303-FREQOEM IF Linear ProcessorModule 05-073-02 Board 33-435-01 D1, D3Pin Diodes U1IF Amplifier D7, D8Varactor Diodes Q3 - Q6Transistors Visual Driver ModuleModule 04-128-02 Mixer D1, D2Diodes Amp #1 Q1 - Q3Transistors Amp #2 Q4, Q5Transistors Envelope DetectorModule 12-017-02 Board 33-094-02 D1,D2Detector Diodes POWER AMPLIFIER SEGMENTS Power Amplifier SegmentsModule 04-294-02 Board 40-240-02 U1SPDT Switch D1 - D3Diodes Q1 – Q5GaAs FET 2 Title, 10 pt bold, italic 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................................................................5/6/99CHECKED: NAME ........................................................... DATERELEASED: NAME.......................................................... DATE Document #: DOC0x-xxxx REV: xxx METERING CALIBRATION Doc16-0003 Before shipping COMWAVE technicians complete system calibrations; however, re-calibration of the driver may become necessary when the input or output power levels are changed. Due to the equal gain of the power amplifiers, re-calibration of the segments is not necessary. Contact 1 customer support for assistance; refer to DOC20-0000 for contact information. For proper calibration, adjustments are performed in a specific sequence. Before beginning, place the driver into “STANDBY” and attach a -30 dB directional coupler and a termination to the internal combiner as shown in Figure 1. TEST SETUP AIR OUTLET RF OUT 25 PIN9 PIN J2 J1 FAN F1 1.5 AMP N-N MALE BARREL A termination which is equal to or greater than the output power of the transmitter should be used. 50 OHM CABLE To Spectrum Analyzer or Power Meter One to 16 Power Amplifier Segments are used in each transmitter, depending upon the power output Figure 1: Test setup. 1 Document DOC20-0001 provides detailed contact information. International phone 001-570-474-6751; USA & Canada phone 1-800-266-9283. THIS PROCEDURE IS APPLICABLE FOR ONLY MAKING MINOR ADJUSTMENTS TO OUTPUT POWER AND ANALOG METERING. DO NOT ADJUST POWER MORE THAN ± ±± ± .5 dB. ADJUSTMENTS MORE THAN ± ±± ± .5 dB MAY RESULT IN INCREASED INTERMODULATION DISTORTION PRODUCTS. FOR LARGER ADJUSTMENTS TO OUTPUT POWER RE-CALIBRATION OF THE IF PRECORRECTOR IS NECESSARY. 3 Title, 10 pt bold, italic 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................................................................5/6/99CHECKED: NAME ........................................................... DATERELEASED: NAME.......................................................... DATE Document #: DOC0x-xxxx REV: xxx DIGITAL OUTPUT POWER CALIBRATION Refer to Figure2 for numerical references unless otherwise noted. 1. Apply a digital IF input signal. 2. Remove the RF Precorrector cover. 3. Turn the RF Precorrector ALC switch 1 to “MANUAL”. 4. Connect an HP435B power meter or equivalent to the -30 dB coupler forward port. 5. Calculate the power meter reading necessary for 100% output power. Table 2: Digital output power example. Transmitter Output @ 25 Watts=+44.00 dBm -30 dB Coupler=-30.00 dB Expected Power Meter Reading=+14.00 dBm 6. Rotate the function switch from “STANDBY” to “FWD PWR” to enable transmit. 7. Adjust the μW attenuator 2 located on the RF Precorrector so that the power meter reads the desired output power. 8. Adjust the motherboard forward metering potentiometer, VR4, so that the driver front panel meter indicates 100% forward power output. Refer to Figure3 for potentiometer locations. 9. Turn the ALC switch 1 to “AUTO”. ANALOG OUTPUT POWER CALIBRATION Refer to Figure2 for numerical references unless otherwise noted.
Analog Power output is dependent upon Modulation Depth. Obtain proper Modulation Depth before setting Output Power levels. Use a video generator capable of Black No Burst (O IRE = 2.2 dB correction factor) or Black Burst with setup (2.6 dB correction factor) for proper power level adjustments. 1. Apply an analog IF input signal. 2. Remove the RF Precorrector cover. 3. Turn the RF Precorrector ALC switch 1 “MANUAL”. 4. Connect an HP435B power meter or equivalent to the -30 dB coupler forward port. 5. Calculate the power meter reading necessary for 100% output, accounting for the coupler loss and correction factor. Table 3: Analog output power example. Transmitter Output @ 100 Watts=+50.00 dBm -30 dB Coupler=-30.00 dB Correction Factor=- 2.60 dB Expected Power Meter Reading=+17.40 dBm 6. Rotate the function switch from “STANDBY” to “FWD PWR” to enable transmit. 7. Adjust the μW attenuator 2 , located on the RF Precorrector, so that the power meter reads the desired output power. 8. Adjust the motherboard forward metering potentiometer, VR4, so that the driver front panel meter indicates 100% forward power output. Refer to Figure3 for potentiometer locations. 9. Turn the ALC switch 1 to “AUTO”. . 4 Title, 10 pt bold, italic COMWAVE DIVISION All information contained in this docum…

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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. COMWAVE DIVISION SCHEMATICS DRIVER 04-056-01 04-292-2gxx-01 (uses 04-257-01) 33-472-01 (this and 33-435, confidential, comprise the 05-073-02 module) 35-081-01 (uses 35-043-01) 33-420-01 33-284-01 33-207-01 33-426-01 (currently, no schematic available) POWER AMPLIFIER SEGMENT 33-352-01 40-240-01 (currently, no schematic available) -1 - Thu Dec 09 09:43:15 1999 3320701.sch-1 - Thu Dec 09 09:48:05 1999

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 SD2500, 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..............................................................................................10 ❖FIELD STRENGTH OF SPURIOUS RADIATION ....................................................................................................11 ❖FREQUENCY STABILITY .........................................................................................................................................13 4.0 SUMMARY ........................................................................................................................................................................14 TABLE OF FIGURES Figure 1: 64-QAM Constellation Diagram. .................................................................................................................................5 Figure 2: Digital modulation occupancy......................................................................................................................................7 TABLE OF PLOTS PLOT 1: Demodulation performance of the 64 QAM transmitter...............................................................................................8 PLOT 2: Frequency response and group delay. ...........................................................................................................................9 PLOT 3: Occupied bandwidth. ..................................................................................................................................................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. ...................................................................................................12 Table 6: Frequency stability over temperature. .........................................................................................................................13 Table 7: Frequency stability over AC input voltage. .................................................................................................................13 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 SD2500 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, and tune-up and maintenance procedures may be found in the technical manual, which is 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 Meter HP Model 436A 3) Frequency Counter HP Model 5350B 4) Digital Multimeter Fluke 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) Ou…

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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 To Whom It May Concern: When I submitted the test report for this transmitter I sent the wrong file. Please disregard the first file that was sent to you and use this as the test report. Thank you, Kimberly Simeone Technical Writer 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 FCC CERTIFICATION REPORT FOR THE SD2500, 25 WATT DIGITAL TRANSMITTER SYSTEM THOMCAST COMMUNICATIONS, COMWAVE DIVISION P.O. Box 69 Oakhill Road Mountaintop, PA 18707 570-474-6751 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 TABLE OF CONTENTS 1.0INTRODUCTION .........................................................................................................................................................4 2.0TEST EQUIPMENT......................................................................................................................................................4 3.0MEASUREMENTS .......................................................................................................................................................4
RF POWER OUTPUT..................................................................................................................................................4
MODULATION CHARACTERISTICS.........................................................................................................................4 ❖GROUP DELAY................................................................................…

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