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Technalogix TAU-500 Manual

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TAU-500
POWER AMPLIFIER
NEW
ADVENTURES
IN
BROADCASTING

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Summary of Contents for Technalogix TAU-500

  • Page 1 TAU-500 POWER AMPLIFIER ADVENTURES BROADCASTING...
  • Page 2 No? Okay, good. Please take a few minutes to read the manual and familiarize yourself with your new Technalogix power amplifier. We believe that this manual, and of course our equipment, should be everything you need to get on the air with superb broadcast quality video.

  • Page 3: Table Of Contents

    Table of Contents I- S ....................I-1 ECTION AFEGUARDS .....................I-2 AFETY AND IRST ....................I-3 PERATING AFEGUARDS ....................II-1 ECTION ARRANTY ....................III-1 ECTION VERVIEW ....................III-1 TANDARD EATURES ....................III-2 RINCIPLE OF PERATION ......................III-3 LOCK IAGRAM ......................III-5 PECIFICATIONS - RF C ................IV-1 ECTION OMPONENTS .......................
  • Page 4 EQUIREMENTS ..............VIII-3 LECTRICAL ERVICE ECOMMENDATIONS ...............VIII-4 NTENNA AND OWER ECOMMENDATIONS .....................VIII-5 HELTER ECURITY ..................VIII-6 NPACKING AND NSPECTION (TAU-500 P OCATION AND UNCTION OF ONTROLS AND ONNECTORS OWER ).........................VIII-7 MPLIFIERS )..VIII-9 OCATION AND UNCTION OF ONTROLS AND ONNECTORS OWER UPPLY ......................VIII-11 NITIAL ..............

  • Page 5: Section I- Safeguards

    Section I - Safeguards General Safeguards This section is written as a general guide to keep all 5 fingers on your hand and is intended for those having previous knowledge and experience with these kinds of equipment. It is not intended to contain a complete statement of all safety precautions, which should be observed by personnel using this or other electronic equipment.

  • Page 6: Safety And First Aid

    Safety and First Aid Personnel engaged in the installation, operation, maintenance, or servicing of electronic equipment are exposed to the hazard of high voltage. It is imperative that all safety regulations and precautions are consistently observed. Knowledge of first aid procedures is recommended. The following information is presented as a reference only.

  • Page 7: Operating Safeguards

    Operating Safeguards It is a known fact that our broadcast transmitters and translators enjoy 50-ohm load impedances. So much so, that it is imperative you maintain 50-ohm impedances throughout your system. In return, your equipment will provide you with maximum power transfer to the antenna and decreased reflected power heading back towards the amplifier pallets, reducing the amount of magic smoke that gets let out of the power amplifier.

  • Page 8: Section Ii - Warranty

    Technalogix Ltd. will not be liable for damages of whatever nature arising out of or in connection with the equipment or its use thereof. Technalogix does not assume responsibility for injury or damage resulting from the practices of untrained or unqualified personnel in the handling of this equipment.
  • Page 9 If a solution cannot be found at this time, it may be determined that the unit will have to be returned to Technalogix for repair, once a Return Materials Authorization (RMA) number is provided. Please look under our web site (www.technalogix.ca) for the RMA form (Service) and fill it out.

  • Page 10: Section Iii - Overview

    Section III – Overview Standard Features • Narrow output bandpass filter allows adjacent channel operation • Front panel Liquid Crystal Display (LCD) to monitor forward and reflected RF power, and DC voltage • Microcontroller-based monitoring and control ensures amplifier will never be overdriven and high VSWR will not damage amplifier •...

  • Page 11: Principle Of Operation

    Principle of Operation The TAU-500 power amplifier supplies a 500-watt peak video signal with an aural carrier level 10 to 13 dB below visual carrier (dBc) on any of the UHF television channels 14 through 69. Please note that channel selection must be made at time of order, as the transmitter or translator is calibrated and tested to the channel requested and is not field tuneable.

  • Page 12: Block Diagram

    Block Diagram The RF signal enters through the RF Input connector on the power amplifier enclosure from the modulator or processor. It then passes through an RF attenuator to limit the output power level of the power amplifier and to help buffer any transients that may come into the power amplifier. After attenuation, the signal gets preamplified through the driver pallet before the signal gets split into (2) signals for final amplification.
  • Page 13 TECH-30U A=-0.5dB typical DIRECTIONAL COUPLER ATTENUATION RF INPUT RF OUT To Wattmeter and Antenna A=-0.05dB typical A=+38dB min. A=-0.2dB typical A=-0.2dB typical P300-UHF FINAL 50 OHM TERMINATION A=14dB min. TAU-500 Block Diagram Date: May 24, 2005 Page: 1 of 1...

  • Page 14: Specifications

    For this reason, we recommend that any different modulator/processor be shipped to Technalogix so the system can be matched and set up optimally. In addition, the audio/video ratio the input to the power amplifier needs to be –10 dB in order for the software and LCD readout to be accurate.
  • Page 15 Physical Characteristics Power Requirements 230 V , 10 A Power Supply Operating Temperature 0 - 50°C Dimensions TAU-500 Power Amplifier ¼ W-19" flange (17” encl.), D-25- ", H-8-¾” (5U) Power Supply ¼ W-19" flange (17” encl.), D-2- ", H-7” (4U)

  • Page 16: Section Iv - Rf Components

    Section IV – RF Components Amplifier Pallets The TECH-30U driver pallet consists of (2) separate printed circuit board stages – The first stage is an ultra-linear class-A stage with (3) gain sections providing a typical adjustable power gain of 26dB to 37dB at 10-watts peak.
  • Page 18 P300-UHF-16 Schematic...

  • Page 19: Splitter/Combiner

    Directional Coupler The Technalogix dual directional couplers provide DC voltages proportional to forward and reflected RF power monitoring. These analog voltages are converted for processing using analog-to-digital converters and provide the control system with valuable data for monitoring purposes. The directional...

  • Page 20: Section V - Power Supply Section

    Section V – Power Supply Switching AC-DC power supplies are used to power the amplifier pallets, the control circuits, and all of the fans. There are (2) power supplies paralleled in the power supply enclosure to generate the necessary current for the amplifier pallets. These (2) supplies are paralleled at 31.0 Vdc nominally and fed to the power amplifier enclosure via 4-AWG multi-stranded conductors and high current connectors.

  • Page 21: Switching Power Supply

    MEAN WELL PSP-1000 SWITCHING POWER SUPPLY SERIES ISO-9001 CERTIFIED MANUFACTURER .LOW COST, HIGH RELIABILITY .100% FULL LOAD BURN-IN TEST .BUILT IN EMI FILTER, CURRENT SHARING CIRCUIT C OUTPUT CAPACITOR .105 º .BUILT IN REMOTE CONTROL, REMOTE SENSE, .BUILT IN PFC CIRCUIT PFC>=0.95, POWER GOOD SIGNAL COMPLIES WITH EN61000-3-2 .SHORT CIRCUIT, OVERLOAD, OVER VOLTAGE, OVER TEMP.

  • Page 23: Section Vi - Monitor And Control System

    Section VI – Monitor and Control System Control Board Overview (Series II-rev I) The control printed circuit boards (PCB) are located at the front of each enclosure connected directly to the back of the liquid crystal displays (LCD) and are identified as Series II – rev I PCBs. The main purpose of the Series II - rev I PCB is to monitor the RF power and the DC supply voltages in the power amplifier and filter enclosures and to monitor just the DC supply voltages in the power supply enclosure.

  • Page 24: Interface Components

    The voltage required by the directional coupler is generated with a standard linear voltage regulator, U103 if it is a voltage other than +5Vdc. C107 and C108 helps clean up any ripple or noise that might be on the output voltage. In the standard configuration, where the directional coupler requires +5Vdc, the +5Vdc is simply taken from the U101 filtered power supply output.

  • Page 25: Signal Conditioning Components

    RESET – Tactile switch resets the monitor and control system. The amplifier gets shut down for under 0.5 seconds and comes back on with each depress of the reset button. At the same time, all fault counters in the microcontroller software are reset and the LCD is reset in the same manner as it is with a depress of the NAVIGATE button.

  • Page 26: Display Components

    Display Components The display section of the Series II – rev I PCB is comprised of the LCD and the components that make up the data bus to send the data from the microcontroller to the LCD. Specifically, the LCD is an alphanumeric 20X4 display that uses the industry standard 44780 controller and a parallel interface for data communications.

  • Page 27: Fault Shutdown

    Fault Shutdowns On the LCD (Liquid Crystal Display) the following messages may appear: If you see this message, the system will: shut amp down for 1 minute automatically turn amp on after 1 minute and check again for overdriven amplifier come back to the same power level that it was set If you see this message, the system will: shut amp down for 5 minutes...

  • Page 28: Remote Port

    Remote Port The remote port allows external control of the transmission system via the DB25 connector on each enclosure. All functions on the remote port are simply hard-wired or paralleled to existing wiring to provide a secondary method of control to the user, and are activated as follows: pin 1: ground to reset microcontroller, float otherwise pin 2: ground for 2 seconds to toggle carrier on/off, float otherwise pin 3: common ground...

  • Page 29: Aterials

    Series II - Bill of Materials revision: Optional part depending on power level of TV or FM date: 21-Jun-05 Item Qty Components Description Tolerance Package Equivalency BZ101 BUZZER, magnetic, 5V, single tone SMD CT-1205C CUI CT-1205C C101, C105 CAPACITOR, electrolytic, 100uF, 63V <=20% SMT (Panasonic VS "G"...

  • Page 30: Bill O F Materials

    Series II - Bill of Materials revision: Optional part depending on power level of TV or FM date: 21-Jun-05 RESISTOR, 4.99 kohm, 1/10 watt, thick R117 film SMD 0805 Panasonic ERJ-6ENF4991V R124 RESISTOR, 13 kohm, 1/8 watt SMD 0805 Rohm MCR10EZHF1302 R125, R127, R126, R128 RESISTOR, 1 kohm, 1/8 watt...
  • Page 31 SERIES II, REV. I - Control System Vin Cond U101 Feedbk F101 J101 1 Vin L101 L102 +5Vdc Vout D101 C102 C103 C104 C101 D102 J101 U102 Feedbk 2 Vin L103 R101 Pin15LCD Vout C105 C106 D103 BK LT J102 BkLtCtrl CTRL SELECT...
  • Page 32 SERIES II, REV. I - Control System +5Vdc R104 R105 R106 J103 R107 R108 PWR In U105 J104 VW uPC PWR uPC J103 2 VW In R109 +5Vdc J104 2 +5Vdc NAV In R110 R111 R112 R113 R114 J103 4 NC(RC6) U106 J104 4...
  • Page 33 SERIES II, REV. I - Control System U107 F102 J108 Isoltd 8 Analog 8 R118 C111 For U7 D105 R119 U107 F103 J108 Isoltd 7 Analog 7 R120 D106 R121 U107 F104 J108 Isoltd 6 Analog 6 R122 D107 R123 J108 L105 Analog 5...
  • Page 34 SERIES II, REV. I - Control System +5Vdc L109 Isoltd 1 C122 C123 C124 R131 L110 Isoltd 2 L111 C125 C126 C127 L112 C128 C129 Isoltd 3 C130 C131 C132 Pin 3 on U109 is left Low Thresh L113 U109 unconnected on PCB Isoltd 4 U110...
  • Page 35 SERIES II, REV. I - Control System J109 Pin3LCD Pin15LCD BkLtCtrl U112 U111 +5Vdc C143 DfromUPC Dclk R132 Latch1CS Latch2CS R133 Q103 uPCPIN14 J110 U11: LCD control signals, LCD backlight control, and External interface outputs U12: LCD data bus (D0...D7) D0...D7 is text or instruction A.
  • Page 36 SERIES II, REV. I - Control System U113 Reset Reset +5Vdc C144 C145 U114 Dclk DfromUPC CONVST MCLR/Vpp DtoUPC Dig.Out1 Latch1CS Dig.Out2 Latch2CS Rly.Ctrl RB0/INT Buzzer OSC1/CLKin OSC2/CLKout CR101 RC0/T1CKI RC7/RX/CK Dig.In 3 RC1/CCP2 RC6/TX/CK OSC1 RC2/CCP1 RC5/SD0 Dig.In 2 OSC2 RC3/SCK/CL RC4/SDI/SDA Dig.In 1...
  • Page 37 Remote Port DB25 red 18AWG DC Supply Series IIG Control PCB red 22AWG green purple OnOff Ground grey RESET Ground (unused) red 22AWG +8Vdc Pallet Disable blue View Input yellow FWD in orange RFL in Reset On/Off Input green Ground to Switches Fault Input RESET green...

  • Page 38: Section Vii - Mechanical Section

    Section VII – Mechanical Section The heat sink allows the amplifiers to operate at a cooler temperature and prevents overheating, which helps the longevity of the entire system. The heat sink has hollow fins, which help dissipate the heat from the amplifiers faster than a conventional serrated or corrugated fin. In addition to the cooling effects of the heat sink, within the 500-watt power amplifier enclosure, there are four fans that each provide 170 cubic feet per minute (CFM) of air flow (into zero static pressure).

  • Page 39: Section Viii - Installation

    A sloping roof will tend to develop leaks less rapidly. The building should be well roofed with good material. The cooling load will be lowered with reflective or light colored roofing material. Technalogix Ltd VIII-1...

  • Page 40: Heating And Cooling Requirements

    The environment’s temperature will contribute greatly to the length of the power amplifier’s life. Technalogix recommends that the building’s filtered air intake must have capacity for all air-flow in the building plus an additional 20%. Keep the intake below the roofline to avoid intake of solar heated air.

  • Page 41: Electrical Service Recommendations

    • You are apt to get better overall support if you give what business you can to local suppliers Technalogix recommends that proper AC line conditioning and surge suppression be provided on the primary AC input to the power amplifier. All electrical service should be installed with your national electrical code in your area, any applicable provincial or state codes, and good engineering practice.

  • Page 42: Antenna And Tower Recommendations

    Technalogix provides complete turnkey antenna systems if needed. If your site is serving as a translator, your receiving antenna should be in line of sight to the originating station all year round.

  • Page 43: Shelter Security

    Check the soil runoff conditions that may slow or hasten wind or water erosion and other concerns that may be unique to your location. Technalogix Ltd VIII-5...

  • Page 44: Unpacking And Inspection

    Claims for loss or damage may not be withheld from any payment to Technalogix, nor may any payment due be withheld pending the outcome thereof. Technalogix cannot guarantee the carrier’s performance.

  • Page 45: Location And Function Of Controls And Connectors

    Location and Function of Controls and Connectors (TAU-500 Power Amplifier) The following illustration depicts the location of the connectors when installing the 500-watt power amplifiers (TAU-500). Technalogix Ltd VIII-7...
  • Page 46 DC input from power supply enclosure. Polarized to avoid improper hook up. REMOTE PORT - pin 1: ground to reset microcontroller, float otherwise pin 2: ground for 2 seconds to toggle carrier on/off, float otherwise pin 3: common ground pin 4: DC power supply sample (28Vdc nominal) Technalogix Ltd VIII-8...

  • Page 47: Location And Function Of Controls And Connectors (Power Supply)

    Location and Function of Controls and Connectors (Power Supply) Technalogix Ltd VIII-9...
  • Page 48 Use supplied NEMA to terminal block connector cable. DC OUT - DC power supply output to power amplifier enclosure AC ON/OFF - AC rocker switch (SPST) to supply AC to the AC-DC Switching power supply. Technalogix Ltd VIII-10...

  • Page 49: Initial Hook Up

    (will be factory set). 9. Install the DC power supply leads (4 AWG) between the power supply enclosure and power amplifier enclosure. 10. Connect the transmitting antenna cable to the RF OUT N-type connector on the PA enclosure RF output. Technalogix Ltd VIII-11...

  • Page 50: Section Ix - Operating Procedure

    500 power amplifier is ready to receive a properly modulated video and audio signal, proceed with the following steps to place the system in operation. The TAU-500 power amplifier has been factory aligned for channel frequency (per system specification), signal levels and optimum performance.
  • Page 51 10. The TAU-500 LCDs show the user the present status of the amplifiers. Adjust RF output power to desired level (see Important RF Power Notice in previous section). Verify that the FWD Power reads 400 to 500 Watts on the PA enclosure - depending on the modulation of the signal content.

  • Page 52: Section X - Maintenance And Troubleshooting

    Section X – Maintenance and Troubleshooting Periodic Maintenance If your unit employs a filter on the air inlet for the fans, the filter should be cleaned every 30 days. If the equipment is operated in a severe dust environment, the filters on the inlet fan may need to be cleaned more regularly.

  • Page 53: Troubleshooting

    Troubleshooting The first and most important aspect of troubleshooting anything is to be systematic. Note where you have looked and what you found. Look first for the obvious. • Make a physical inspection of the entire facility. Are all necessary connections properly made? Do you see any signs of obvious damage within the equipment? •...
  • Page 54 Symptom Possible Fault Correction Weak output or picture Low level input signal Verify presence and level of input signal Low output power Verify power amplifier output with wattmeter and dummy load Incorrect modulation depth Adjust to meet specification High reflected power Incorrect load Ensure amplifier connected to transmission line...
  • Page 55 Thank you for choosing Technalogix Ltd.

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