BMTTUA100FAUHF LPTV Power Amplifier

P.O. Box 68, White Haven, PA 18661 Phone: (570) 443-9575 FAX: (570) 443-9257 MDS  MMDS  ITFS  LPTV North America  South America  Europe  Asia  Australia  Africa Since 1960 TUA100FA 100W SOLID STATE UHF POWER AMPLIFIER TUA100FA 100W SOLID STATE UHF POWER AMPLIFIER BROADCAST PRODUCTS 04/99 TABLE OF CONTENTS I. THE TUA100FA POWER AMPLIFIER 1.1Introduction 1.2Specifications 1.3Installation 1.4Operation 1.5Warranty and Parts Ordering II. CIRCUIT DESCRIPTION 2.1Power Amplifier Drawer III. MAINTENANCE 3.1Periodic Maintenance Schedule 3.2Recommended Test Equipment 3.3Troubleshooting Chart 3.4Alignment 3.5TTU100FA Transmitter Power Calibration 3.6TU100FA Translator Power Calibration 3.7Spare Modules and Components IV. DATA PAK V.SCHEMATIC DIAGRAMS i SECTION I THE TUA100FA POWER AMPLIFIER 1.1Introduction............................................................. 1 6 1 1.2Specifications........................................................... 1 6 1 1.3Installation.............................................................. 1 6 2 1.4Operation............................................................... 1 6 3 1.4aTTU100FA Transmitter............................................... 1 6 3 1.4bTU100FA Translator................................................. 1 6 4 1.5Warranty and Parts Ordering............................................ 1 6 5 161 SECTION I THE TUA100FA POWER AMPLIFIER 1.1Introduction: The EMCEE model TUA100FA Power Amplifier is rated to provide 100 watts peak visual and 10 watts average aural power on any FCC specified UHF channel extending from 470 to 806MHz when driven by the EMCEE TTU20F Transmitter or TU20F Translator. This compact, single drawer unit is completely solid-state and requires only minimal RF alignment, making it easy to service and maintain. The TUA100FA was designed for the express purpose of broadcasting as authorized by the Federal Communications Commission under Part 74, Subpart G of the FCC Rules and Regulations. 1.2Specifications: Output Power100W peak visual 10W average aural Output Frequency Range470-806MHz (FCC Ch. 14-69) Gain12dB Channel Flatness±0.5dB Input Impedance50 ohms (N connector) Output Impedance50 ohms (N connector) Spurious Products>50dB below peak sync Harmonics>60dB below peak sync Intermodulation Products (IM 3)>52dB below peak sync Differential Gain5% maximum Differential Phase3E maximum Color TransmissionCompatible with PAL, SECAM, and NTSC Power Requirements115Vac ± 15%, 60Hz, 700W 230Vac ± 15%, 50Hz (OPTIONAL) Ambient Temperature!30EC to +50EC 162 Mechanical Dimensions Power Amplifier Drawer5.25"H x 19"W x 27"D Weight30 lb. 1.3Installation: 1.After unpacking the EMCEE Model TUA100FA Amplifier, a thorough inspection should be conducted to reveal any damage which may have occurred during shipment. If damage is found, immediately notify the shipping agency and advise EMCEE Broadcast Products or its field representative. 2.Place the TUA100FA in a clean, weatherproof environment with adequate ventilation. Insure that the amplifier’s ambient temperature does not exceed the ! 30 E C and +50 E C limits and check to see that nothing blocks the exhaust fan located on the rear of the unit. IMPORTANT Do not apply ac power to the amplifier at this time since its RF output must be properly loaded before being placed in operation. 3.Place the amplifier in its permanent location near a 120Vac, 50 or 60Hz, single-phase receptacle. Unless the customer has specifically requested 220Vac operation, the amplifier will operate only from a 120Vac source. The ac source should have a minimum power capacity of 700 watts. 4.Set all circuit breakers and switches, including the ac mains breaker, to the OFF position. Place an appropriate ac power line protector (surge suppressor) across the ac line that supplies the amplifier. 5.Connect the EMCEE supplied interconnect harness to the TTU20F Transmitter or TU20F Translator CONTROL jack (J4) and the TUA100FA Amplifier CONTROL jack (J3). In the case of a transmitter system, find the two video sense wires connected to the TTU/TU20F CONTROL jack (J4) end of the harness but broken out separately. If video sense output is provided by the modulator, connect the striped white/orange/black wire to the video sense terminal and the black wire to the GND terminal on the modulator’s rear panel. Otherwise, clip off any bare conductor at the end of each wire and tie them back separately. For a translator system, plug the 9-pin D connector into the Receiver CONTROL jack (J7). 6.Connect the EMCEE supplied RF cable (N connector to N connector) to the RF OUT jack (J2) on the rear panel of the TTU/TU20F and the INPUT jack (J1) on the TUA100FA Power Amplifier's rear panel. 7.Connect the transmitting antenna cable to the Power Amplifier's RF OUT connector (J2). 163 1.4Operation: 1.4a TTU100FA Transmitter: Assuming the installation instructions of Section 1.3 have been completed and the transmitter is receiving baseband video and audio signals, proceed with the following steps to place the transmitter in operation. It is assumed that the TTU20F is being used as a driver. 1.Place the modulator (A1) power switch to ON and verify that it provides 87.5% video modulation. If necessary, adjust the modulator for 87.5% video modulation as described in its instruction manual. 2.On the TTU20F Driver (A2), turn the POWER ADJUST control fully counterclockwise, place the OPERATE/STANDBY switch to STANDBY, and place the OPERATE/ALIGN switch to OPERATE. Place the meter switch to FWD and the POWER circuit breaker to ON. Then verify the following responses of the driver. a.The fans of the driver should be operating and exhausting air out the rear of the drawer. b.The driver OPERATE, SYNTH LOCK and DRIVER AMP indicators should be illuminated green. c.The TEMP EXCITER, ON, FINAL BIAS, and VSWR OVLD indicators should be extinguished. 3.Place the TUA100FA Amplifier (A3) POWER switch to ON and meter switch to FWD. Verify the following responses of th…

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TUA100FA Amplifier Front View TUA100FA Amplifier Rear View

2.14 Certification Identification Label [2.1003] The certification identification label for the aforementioned model is shown below. This label shall be displayed conspicuously on the front panel of the appropriate unit. Figure 2 614

TUA100FA Amplifier Internal View

161 SECTION I 1.0INTRODUCTION 1.1General This report contains data required for certification of the EMCEE Model TUA100FA UHF Television Power Amplifier. This amplifier, which will be manufactured in quantity, is intended for use with any type accepted 20 watt LPTV transmitter or 20 watt translator, particularly the EMCEE Models TTU20F and TU20F. Using two parallel LDMOS power transistors in a single amplifier module, the TUA100FA is rated to provide 100 watts peak visual and 10 watts average aural power on any specified UHF channel extending from 470MHz to 806MHz. The data contained in this report was obtained from tests performed on an EMCEE production unit having an output frequency of UHF channel 65 (776-782MHz) using a TTU20F LPTV Transmitter as its 20 watt driver. A complete list of the test equipment utilized to obtain the certification data can be found in Section 1.3 of this report. Information relating to the description, operation and maintenance of the amplifier can be found in the TUA100FA Instruction Manual. Information concerning the TTU20F transmitter, including modulators, may be found in its previously submitted type acceptance report (BMTTTU20F Grant 1/22/96).

Page 1 1.4Active Device List The following is a complete listing of all the active devices used in the EMCEE Model TUA100FA UHF Power Amplifier. The devices are grouped together as seen on each specific schematic or interconnection diagram. Given with each device is its schematic designator, EMCEE part number and function. DEVICEPART #/DESIGNATORFUNCTION 100 Watt UHF Amplifier Schematic Diagram 40383163 Integrated CircuitMC1723CD/U1Current Regulator TransistorPTF10159/Q1, Q2RF Amplifier Page 2 3.4Alignment: 3.4aUHF Notch Filter: 1.Place the Amplifier Drawer POWER ON switch to off. Disconnect the input cable from the Notch Filter and connect the filter’s input directly to the sweep generator's RF output. 2.Place the RF Detector directly on the RF OUTPUT connector (J2) of the transmitter. 3.Tune the sweep generator to the center frequency of the transmitter's output channel employing a 20MHz sweep width display on the oscilloscope. Display the 1MHz markers. 4.The filter adjustments are the two threaded rods located on the short side of the filter accessible through the left side panel toward the rear of the drawer. If they are not marked, slowly adjust one and observe which notch moves on the scope and set accordingly. Do not switch the positions of the individual notches. Set the lower notch to (Visual Carrier Frequency   4.5MHz). Set the upper notch to (Aural Carrier Frequency + 4.5MHz). The visual carrier frequency for the appropriate UHF channel can be found in Section 4, the Data Pak, or in Table 26 6 1. 5.Remove the sweeper cable from the filter input and the RF Detector from the drawer output. Replace the Notch Filter input cable. 3.5TTU100FA Transmitter Power Calibration: To ensure proper transmission, the output power level and % Power Meter calibration should be checked once every year. With the meter switch in the FWD position, the % Power Meter has been factory calibrated for 100% with the transmitter providing 100 watts peak visual and 10 watts average aural. The following calibration procedure assumes that the visual carrier has 87.5% video modulation and 0% average picture level (APL). In the following steps, the power levels stated are those expected at the output of the transmitter. Therefore, when measuring these power levels as shown in Figure 366, be sure to take into account the 30dB factor provided by the attenuator. Power levels at 50% APL (stair steps) are included in brackets following the power levels at 0% APL (SYNC only). 3.5aForward Power: 1.With the TTU20F in STANDBY and the TUA100FA Amplifier off (POWER ON circuit breaker down), set up the test equipment as shown in Figure 366. 2.Verify that the modulator is operating and providing 87.5% video modulation. Place the 100 Watt Amplifier POWER switch to ON and make sure the Amplifier’s Meter Switch is in the FWD position. Place the TTU20F Transmitter STANDBY switch to OPERATE. Page 3 3.To set the output power, adjust the TTU20F POWER ADJUST for an external power meter reading of 69.5W [44W]. Note that 100W peak visual at 0% [50%] APL and 87.5% modulation plus 10W average aural equals 69.5W [44W] average power. 4.To check or adjust the visual to aural carrier ratio, replace the power meter in Figure 366 with a spectrum analyzer. Adjust the aural carrier level on the modulator for the desired ratio. Remove the spectrum analyzer and return the power meter to the Transmitter’s output and reset the output power for an external power meter reading of 69.5W [44W]. 5.With the external power meter showing the correct power, place the meter switch to FWD and check the TUA100FA front panel % Power Meter for a 100% indication. If this reading is not obtained, adjust potentiometer R9 of the Metering Detector (A3) for a 100% indication. The Metering Detector is mounted on the right-hand side wall near the front of the amplifier drawer and is accessible through the holes in the side wall. The % Power Meter on the TTU20F Transmitter/Driver will indicate less than 100% which is an appropriate reading. 3.5bReflected Power ( OPTIONAL ): 6.On the right side wall of the TUA100FA Power Amplifier drawer, adjust potentiometer R30 of the Metering Detector fully clockwise to disable the VSWR overload detection circuit. Place the amplifier drawer meter switch to REFL. 7.Place the Transmitter/Driver OPERATE/STANDBY switch to STANDBY and the OPERATE/ ALIGN switch to ALIGN. Remove and reverse the forward power (J3) and reflected power (J4) coupling port cables on the Metering Coupler (DC1). J1 and J3 of the Metering Detector (A3) should now be connected to J4 and J3 of the Metering Coupler (DC1), respectively. This simulates an open circuit at the amplifier's RF OUTput (J2) delivering maximum returned power to the REFL port of the Metering Detector. Insert a step attenuator between the modulator's IF OUTPUT and the transmitter's IF INPUT and set the step attenuator for 10dB attenuation. 8.Place the Transmitter/Driver OPERATE/STANDBY switch to OPERATE. Remove the attenuation from the step attenuator for an external power meter reading of 69.5W [44W]. Check the amplifier drawer's front panel REFL meter for a 100% [70%] reading. If necessary, adjust potentiometer R27 of the amplifier Metering Detector for the proper reading. R7 is accessible through the right-hand side wall of the drawer. 9.Decrease the transmitter's power to 50% by increasing the step attenuator 3dB for an external power meter reading of 34.75W [22W ]. This power level is used for setting the trip point of the VSWR overload detection circuit. Adjust R30 of the amplifier’s Metering Detector slowly counterclockwise until the front panel VSWR OVLD indicator illuminates red and the Transmitter/Driver is placed in standby. 10.Check the VSWR OVLD trip point by setting the step attenuator for an additional 1dB of attenuation. Press the momentary VSWR RESET switch to reset the transmitter and remove the additional 1dB of attenuation from the step attenuator. The VSWR OVLD circuit sho…

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SECTION V SCHEMATIC DIAGRAMS MODULE SCHEMATICS ARE LISTED IN ALPHANUMERICAL SEQUENCE

B R O A D C A S T P R O D U C T S, I N C. P.O. Box 68  Susquehanna St. Ext.  W hite Haven, PA 18661  570-443-9575  800-233-6193  FAX 570-443-9257 E-Mail: [email protected] * Internet www.emceebrd.com April 18, 2000 Federal Communications Commission Equipment Approval Services P.O. Box 358315 Pittsburgh, PA 15251-5315 Gentlemen: EMCEE Broadcast Products requests certification of the Model TUA100FA 100 Watt UHF Power Amplifier in accordance with Part 74, Subpart G of the Commission’s Rules and Regulations. Enclosed is a copy of the EMCEE engineering report describing the equipment and test procedures utilized to confirm compliance with the regulations applicable to Low Power Television, Television Translator and TV Booster Stations. Also included is the TUA100FA Amplifier instruction manual which contains the required circuit descriptions, alignment procedures, and technical specifications. A check in the amount of $475 to cover the filing fee is also enclosed. If any further information is required to expedite this application, please feel free to call me at 570-443-9575 or 800-233-6193. Sincerely, Robert G. Nash VP/Director of Engineering Certification Submission for the Model TUA100FA 100 Watt UHF Power Amplifier per Part 74, Subpart G, of the FCC Rules and Regulations EMCEE Broadcast Products PO Box 68 White Haven, PA 18661-0068 i TABLE OF CONTENTS SECTIONPAGE I.INTRODUCTION 1.1General ...................................................... 1-1 1.2Personnel Qualifications ......................................... 1-1 1.3Test Equipment ................................................ 1-1 1.4Active Device List .............................................. 1-2 1.5Certification of Data ............................................ 1-3 II.TEST PROCEDURES AND DATA 2.1Frequency Response............................................ 2-1 2.2Attenuation Characteristics....................................... 2-4 2.3Differential Phase and Gain....................................... 2-7 2.4Envelope Delay............................................... 2-10 2.5Aural Occupied Bandwidth...................................... 2-13 2.6Aural Distortion ............................................... 2-16 2.7Aural Frequency Response...................................... 2-18 2.8Amplitude Modulation Noise..................................... 2-20 2.9Frequency Modulation Noise..................................... 2-22 2.10 Antenna Terminal Radio Frequency Voltage........................ 2-24 2.11 Spurious Radiation Field Strength................................. 2-26 2.12 Power Output Meter Calibration.................................. 2-28 2.13 Frequency Stability............................................. N/A 2.14 Type Acceptance Identification Label.............................. 2-30 2.15 Photographs.................................................. 2-31 161 SECTION I 1.0INTRODUCTION 1.1General This report contains data required for certification of the EMCEE Model TUA100FA UHF Television Power Amplifier. This amplifier, which will be manufactured in quantity, is intended for use with any type accepted 20 watt LPTV transmitter or 20 watt translator, particularly the EMCEE Models TTU20F and TU20F. Using two parallel LDMOS power transistors in a single amplifier module, the TUA100FA is rated to provide 100 watts peak visual and 10 watts average aural power on any specified UHF channel extending from 470MHz to 806MHz. The data contained in this report was obtained from tests performed on an EMCEE production unit having an output frequency of UHF channel 65 (776-782MHz) using a TTU20F LPTV Transmitter as its 20 watt driver. A complete list of the test equipment utilized to obtain the certification data can be found in Section 1.3 of this report. Information relating to the description, operation and maintenance of the amplifier can be found in the TUA100FA Instruction Manual. Information concerning the TTU20F transmitter, including modulators, may be found in its previously submitted type acceptance report (BMTTTU20F Grant 1/22/96). 1.2Personnel Qualifications The certification tests were conducted under the supervision of Robert Nash, EMCEE VP/Director of Engineering. Mr. Nash has 23 years of experience in the development and testing of television transmitters and translators. 1.3Test Equipment 1.Antenna, Adjustable Dipole Set, 30MHz-1GHz, Model 3121, EMCO 2.Antenna, Conical Helix, 1-11GHz, Model ALN108B, AEL 3.Attenuator, 10dB, Model 766-10, Narda 4.Attenuator, 20dB, Model 766-20, Narda 5.Attenuator, 30dB, Model 766-30, Narda 6.Attenuator, 30dB, 150W, Model 769-30, Narda 7.Distortion Measurement Set, Model 339A, Hewlett Packard 8.Demodulator, Model 1450, Tektronix 9.Directional Coupler, 30dB, Model 3001-30, Narda 162 10.Diode Detector, 50 ohm, Model 8553, Telonic Berkeley 11.Envelope Delay Measuring Set, Model 201/1, Shibasoku 12.Mixer, Model ZAD-2, Mini-Circuits 13.Modulator, Model EM1, EMCEE 14.Multimeter, Digital, Model E2378A, Hewlett Packard 15.NTSC Vectorscope, Model 520, Tektronix 16.NTSC Video Generator, Type 149A, Tektronix 17.Power Meter, Model 435A, Hewlett Packard 18.Spectrum Analyzer, Model 8594E, Hewlett Packard 19.Waveform Monitor, Model 1485R, Tektronix 20.20 Watt LPTV Transmitter, Model TTU20F, EMCEE 21.100 Watt Power Amplifier, Model TUA100FA, EMCEE 1.4Active Device List The following is a complete listing of all the active devices used in the EMCEE Model TUA100FA UHF Power Amplifier. The devices are grouped together as seen on each specific schematic or interconnection diagram. Given with each device is its schematic designator, EMCEE part number and function. DEVICEPART #/DESIGNATORFUNCTION 100 Watt UHF Amplifier Schematic Diagram 40383163 Integrated CircuitMC1723CD/U1Current Regulator TransistorPTF10159/Q1, Q2RF Amplifier 163 1.5Certification of Data Having supervised the tests and compilation of information in this report, I certify that all statements and test results submitte…

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