TAUD-1000 BROADCAST TRANSMITTER OPERATING MANUAL
You’ve already unpacked it, haven’t you? You’ve unpacked it and plugged it in and turned it on and fiddled with the knobs. 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.
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. DOCUMENTATION - Read, retain and follow instructions before operating the equipment.
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. • At all times, avoid placing any part of the body in series between ground and circuit points, whether power is on or off.
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.
Section II - Warranty Our legalese is straightforward. It is simply designed to give you peace of mind and helps you resist the temptation to have your electronics friend try to repair your Technalogix product. Technalogix Ltd. products have been completely tested and found to meet specifications and be in proper operating condition. They are warranted to be free from defects in materials and workmanship for a period of one year from the date of shipment.
To claim your rights under this warranty: • Contact Technalogix and describe the problem in as much detail as possible. See troubleshooting section in this manual. 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. Either fax it to us or email to us.
Terms & Conditions of Sale Sales by Technalogix Ltd (“Seller”) are made only on the terms which are contained in this Terms and Conditions of Sale Policy. Seller hereby gives notice of its objection to any different or additional terms and conditions. All sales are expressly conditional upon Buyers’ assent to the terms and conditions set forth below. These terms and conditions may be modified or supplemented only by a written document sighed by the authorized representative of Seller.
Terms of Payment Seller will provide credit terms to Buyer at its discretion. Such terms are subject to change at all times. If credit is provided, Seller will invoice Buyer on the date the product is ordered. Such invoices will be due and payable net thirty (30) days from date of invoice, subject to credit approval. If credit is not established or maintained, terms shall be net cash on or prior to the Delivery Date.
Orders for custom product are subject to a cancellation fee of up to 100% of the order, depending on the stage of completion of the order at the date the cancellation or revision is accepted. Returns The return of Products without a written authorization by Seller will not be accepted. Returns are accepted only with a valid Return Material Authorization (RMA) number for items to be returned. To receive authorization for Product return, please call customer service.
Section III – Overview Standard Features • Narrow output bandpass filter allows adjacent channel operation • Front panel Display to monitor system parameters • Microcontroller-based monitoring and control ensures amplifier will never be overdriven and high VSWR will not damage amplifier • All aluminium enclosure maintains power amplifier’s light weight • Simple design using commonly available parts ensures reliable operation • Ethernet, SNMP and Remote Port system monitoring III-1
Principle of Operation The TAUD-1000 power amplifier supplies a 1000-watt (rms) 8VSB television signal 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.
COMBINER/FILTER TAUD-500 AMPLIFIER Modulator or Processor RF Out TAUD-500 AMPLIFIER External power supply TAUD-1000 BLOCK DIAGRAM Rev ID Date: November 17, 2008 Page: 1 of 1
Inside each of the 500-watt RMS power amplifiers, the signal 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 a UHFTV50 driver amplifier before the signal gets split into (3) signals for final amplification using a 3-way microstrip power divider. The final amplification stage is comprised of (3) BLF878 final amplifiers.
BLF878 FINAL AMPLIFIER PALLET 3 WAY SPLIITER 3 WAY COMBINER A=-0.5dB typical ATTENUATION Directional C RF INPUT RF OUT To Wattmeter and Antenna A=-0.
After amplification, the signal exits the power amplifier enclosure and goes into the filter/coupler enclosure. The two RF signals from each of the TAUD-500 amplifiers (500-watts RMS) get combined by a 2-way, 90 degree combiner via phased cables.
COMBINER FILTER DIRECTIONAL COUPLER PA1 OUT RF OUT PA2 OUT A=-0.05dB A=-0.45dB TO WATTMETER AND ANTENNA A=-0.6dB to -1.
Specifications Electrical specifications that are specific to the unit are included with the shipment in addition to being kept on file at Technalogix Physical Characteristics Operating Temperature Dimensions 0 - 50°C TAUD-500 Power Amplifier (each) Combiner/Filter Power Supply TM600-8VSB Modulator (if supplied) W-19" flange (17” encl.), D-25-¼", H-10 ½” (6U) each W-19" flange (17” encl.), D-25-¼", H-10 ½” (6U) W-19" flange (17” encl.), D-25-¼", H-5 ¼” (3U) W-19" flange (17” encl.
Section IV – RF Components Amplifier Pallets The UHFTV-50 driver pallet is also a linear class-AB pallet. It has a typical gain of 37dB and draws no more than 3.0Adc total drain current. The quiescent and drain currents can be measured on the UHFTV-50 by inserting an ammeter in series with the power supply lead to the pallet or by measuring the voltage drop across the current sense resistor found directly at the DC power supply lead input to the pallet. This resistance is 0.
Power Divider/Combiner (internal to each TAUD-500 enclosure) A Wilkinson power divider and combiner (identical printed circuit boards) are used to split the RF signal into, and combine the amplified RF signal out of the (3) BLF final amplifier pallets. Flanged power resistors help ensure that any differences between the inputs or outputs are balanced.
Filter The passive bandpass filter rejects spurious and harmonic output products and passes the channel RF output. The cavity resonator uses aperture coupling and is a linear resonator design. Typical insertion loss is 0.4 dB to 0.6 dB depending on channel frequency. The filter is DC grounded on both the input and output for additional lightning protection.
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 switching supplies in the Power Supply enclosure that feed all of the amplifier pallets and fans inside each of the two TAUD-500 amplifier enclosures that make the 1,000-watts RMS. In addition, the Combiner/Filter enclosure has a small switching supply to feed the control circuitry in that enclosure.
RSP-3000 3000W Single Output Power Supply series Features : AC input 180 ~ 264VAC AC input active surge current limiting High efficiency up to 90% Built-in active PFC function,PF>0.95 Protections: Short circuit / Overload / Over voltage / Over temperature / Fan alarm Forced air cooling by built-in DC with fan speed control function Output voltage can be trimmed between 20~110% of the rated output voltage High power density 15.
RSP-3000 3000W Single Output Power Supply Mechanical Specification Case No.982B series Unit:mm 278 236.3 40 CN1 CN2 8 64 2 7 53 1 20 38 63.5 12.5 27 CN3 8 6 4 2 10 8 6 4 2 7 5 31 9 75 31 8-M4(Both Sides) L=5mm 236.3 7.9 27 4-M4 L=5mm OUTPUT 4 +V -V 162 Air flow direction + SVR CN3 8 6 4 2 10 8 6 4 2 7 5 31 97 5 31 177.8 LED CN1 CN2 8 642 7 531 TB1 1 13 2 3 10 INPUT 16max. AC Input Terminal Pin No. Assignment Pin No. 1 2 3 Control Pin No.
RSP-3000 3000W Single Output Power Supply Derating Curve series Static Characteristics Ta=25 100 80 100 90 50 LOAD (%) LOAD (%) 60 40 20 -20 80 70 60 0 10 20 30 40 50 60 70 (HORIZONTAL) 180 185 190 195 200 210 220 230 240 250 264 INPUT VOLTAGE (V) 60Hz AMBIENT TEMPERATURE ( ) Function Manual 1.Remote ON/OFF (1)Remote ON/OFF control becomes available by applying voltage in CN1 & CN2 & CN3. (2)Table 1.1 shows the specification of Remote ON/OFF function. (3)Fig.1.
RSP-3000 3000W Single Output Power Supply series 2.Alarm Signal Output (1)Alarm signal is sent out through "P OK" & "P OK GND" and P OK2 & P OK GND2 pins. (2)An external voltage source is required for this function. (3)Table 2.1 explain the alarm function built-in the power supply. Function Description Output of alarm(P OK, Relay Contact) Output of alarm(P OK2, TTL Signal) The signal is "Low" when the power supply is above Low (0.5V max at 500mA) Low (0.
RSP-3000 3000W Single Output Power Supply series 4.Current Sharing (1)Parallel operation is available by connecting the units shown as below (+S,-S and CS are connected mutually in parallel): (2)The voltage difference among each output should be minimized that less than 2% is required. (3)The total output current must not exceed the value determined by the following equation. (Output current at parallel operation)=(The rated current per unit) x (Number of unit) x 0.
RSP-3000 3000W Single Output Power Supply series 6.Three Phase Connect FIG. A: 3 3W 220VAC SYSTEM (STANDARD MODEL FOR STOCK) R R L1 N1 220V S L2 N2 T L3 N3 S FG1 FG2 FG3 220V N (NC) FG T FIG. B: 3 4W 220/380VAC SYSTEM R R L1 N1 220V S L2 N2 T N L3 N3 FG1 FG2 FG3 N S 380V FG T FIG. C: 3 4W 190/110VAC SYSTEM R 110V R L1 N1 S N L2 N2 (N.C.
MEAN WELL SWITCHING POWER SUPPLY ISO-9001 CERTIFIED MANUFACTURER .LOW COST, HIGH RELIABILITY .COMPACT SIZE, LIGHT WEIGHT .105ºC OUTPUT CAPACITOR .100% FULL LOAD BURN-IN TEST .INTERNATIONAL AC INPUT RANGE .BUILT IN EMI FILTER, LOW RIPPLE NOISE S-60 SERIES .HIGH EFFICIENCY, LOW WORKING TEMPERATURE .SOFT-START CIRCUIT, LIMITING AC SURGE CURRENT .SHORT CIRCUIT, OVERLOAD, OVER VOLTAGE PROTECTED MODEL S-60-5 S-60-12 S-60-15 S-60-24 5V 12V 15V 24V OUTPUT V.
Section VI – Monitor and Control System Control System Overview (Adrenaline) The Adrenaline control system is used for a variety of functions, the most important of which is ensuring that the transmitter continues to operate in a safe manner. The control system also allows the user to monitor and control the transmitter from both the front panel and remotely through the parallel port, Ethernet, or SNMP access port (some features optional). The Adrenaline control system is comprised of three modules.
DISPLAY INTERFACE PANEL SWITCH INTERFACE MEMBRANE SWITCH CHARACTER LCD DISPLAY INTERFACE +5V SWITCHING SUPPLY DC IN CONTRAST SUPPLY TOUCHSCREEN CAN INTERFACE EXTERNAL DC-DC CONVERTER DC OUT DC DISTRIBUTION CAT5 CAN INTERFACE PALLET CURRENT MONITORING DC IN TEMPERATURE SENSOR DC OUT FAN CURRENT MONITORING EXTERNAL SHUTDOWN TEMP SENSOR CAT5 SHUTDOWN INTERFACE SHUTDOWN INTERFACE RF SHUTDOWN CAT5 RF SHUTDOWN RF TEMP AND SHUTDOWN INTERFACE CAN INTERFACE RF IN PHASE ADJUST SYSTEM MEASURE
Display Interface Module REV 1.01 (ASY 015) Touchscreen Option The primary function of the Display Interface module is, as the name suggests, providing the display and user interface for the control system. This circuit board is mounted behind the front panel of the power amplifier enclosure(s) in the transmitter/translator, near the 4.3” touchscreen display. All switch/settings and user interface is handled through the resistive touchscreen.
The hardware of the Display Interface module is based around microcontroller (U101). This part interfaces directly with the touchscreen to provide output and receive input from the user. It also communicates with the RF board (and DC Distribution Module, if installed) over a Controller Area Network (CAN) bus. This communication is facilitated by U103, and passes through a CAT5 cable attached to connector J104.
Main Screen From the screen shot of the main screen, as seen in the figure below, all of the system’s main parameters can be viewed at a quick glance. The three main sections of this screen are the four level bars, the summary bar at the bottom of the screen, and the carrier ON/OFF button. The level bars show real time system performance and help illustrate any transient changes that occur.
Reflected RF power level in % out of 100 or watts. Mimics data from level bar. The high VSWR fault occurs when the measured VSWR of the system exceeds the user-defined VSWR trip point found in the RF Power Menu, described later in this section. If the VSWR exceeds the user defined shutdown level, but is below 1.8:1, then attenuation is added to the power amplifier input until a safe level is reached. If the measured VSWR exceeds 1.8:1, then the RF carrier is turned off to protect the amplifier chain.
Date and Time. Displays current date and time. Power amplifiers ship from factory with default Mountain Standard Time (MST). Users can adjust this info from the Date and Time Screen. The event recorder pulls this info when it logs an event so the user can correlate events in the field. Events stored prior to a date and/or time change will maintain their original event stamp and will not be modified to reflect the change. A Real Time Clock holds time for about one week without AC power.
Menu Screen The menu screen allows the user to dive into further details of the power amplifier’s operations. Pressing the BACK TO MAIN button will toggle between the Main Screen and the Menu Screen. The Menu Screen is shown below: Each of the menu icons on the Menu Screen allow the user to take additional readings or make settings that are not provided from the Main Screen.
RF Levels Screen This screen allows the user to change settings to the RF levels, including the Forward RF level and the reflected (VSWR) trip point. From this screen, the user can also toggle between AGC and Manual mode. The RF Levels Screen is displayed below: To adjust Forward RF Level: Press the up or down arrows until the desired Forward RF level is reached. If the adjusted level exceeds 110%, the protection will kick in and the system will fold back the RF power to a safe level.
Power Supplies Screen This screen allows the user to view individual voltage and current readings. The Power Supplies Screen is displayed below: DC supply voltages are nominally 30 or 48Vdc depending on the system. Readings of this voltage in the Power Supplies Screen, and on the summary bar at the bottom of the touchscreen, should not vary more than +/- 2%.
Remote Interfacing Screen The Remote Interfacing Screen is simply a summary of what features are installed into the control system, as seen in the following screen shot. The Remote Port, or parallel data, through the DB25 connector on the back panel of the enclosure extracts the majority of the internal system information and provides it externally for processing and control. The Remote Port is the equivalent of a standalone external remote monitor.
History Screen The History Screen provides a summary of the most recent events that have occurred in the power amplifier, including the date and time of occurrence. An event can either be a fault or simply an action like turning on or off the carrier. The format of the History Screen is illustrated below: Ten of the most recent events are displayed on the History Screen. As more events occur, the earliest recorded event gets displaced on the screen.
Date and Time Screen The Date and Time Screen is used to update the date and time of the control system. This is typically used to create accurate correlations between the event history and events that are external to the system. The time is factory set to the factory’s Mountain Standard Time (MST). Changes to the date or time are made by simply pressing the up or down arrows associated with each section (month, day, hour, etc).
Version Screen The Version Screen contains no user-settable items, but is intended as an identification screen to the user. It also helps Technalogix maintain its unmatched service reputation by allowing our technicians and Service team to know exactly what versions of PCBs are inside a customer’s unit, even several years down the road. The versions can then be correlated to factory documentation. In addition, current government certification numbers are included for Industry Canada and FCC.
Contact Screen The Contact Screen provides an easy means for the user to get in touch with Technalogix for anything. Whether they have a technical or installation question or simply want to chat about how gosh darn cool our equipment is, Technalogix welcomes questions, feedback, and contact. If you are in the area, please feel free to stop by to tour the facility, test drive some state of the art products, or get a refresher on some training.
Settings Screen “You say tomato...” The Settings Screen allows the user to modify some of their preferences on how information is displayed on the touchscreen, as seen in the figure below: Pressing the DEGREES F button will convert all temperature readings to degrees Fahrenheit from Celsius (and vice versa). Temperature protection trip points are factory set. Similarly, the user can switch between watts or percentage for their RF power readings.
DC Distribution Module REV 1.01 (ASY 085) The DC Distribution module takes DC from the system’s power supply, splits it up for drivers, finals, and fans, and monitors the current draw of the individual loads for protection, as seen in the following block diagram: DC is fed into the module via connectors J313 and J314 for the drivers and fans and J315 through J322 for the finals. The DC currents are then monitored for both display and protection purposes.
Temperature Sensor Module REV 1.11 (ASY 181) The Temperature Sensor module is a small board mounted to the main heatsink of the amplifier. The main purpose of the temperature sensor module is to take temperature readings of the heatsink. The following is a block diagram of the Temperature Sensor module: The temperature sensor IC is U701 which, after it has taken a reading, relays the digital information to the RF PCB module through J702.
Temp sensor 1.
Temp sensor 1.
RF Module REV 1.
The RF input signal comes in to the RF module through J214 (BNC female) or J217 (N female) before it passes through a phase adjust circuit (installed only in multiple power amplifier systems) made up of U227/U231 and associated circuitry. The signal then passes through the voltage-controlled variable attenuator, U236. This attenuator is controlled via DAC (U209) and buffer (U226) via the microcontroller. Finally, the low level RF signal exits through J207 (BNC female).
RF Module REV 1.
The RF input signal comes in to the RF module through J218 (BNC female) or J217 (N female) before it passes through a phase adjust circuit (installed only in multiple power amplifier systems) made up of U231/U234 and associated circuitry. The signal then passes through the voltage-controlled variable attenuator, U241. This attenuator is controlled via DAC (U210) and buffer (U229) via the microcontroller.
RF Module REV 1.
The RF input signal comes in to the RF module through J216 (BNC female) or J202 (SMA female) before it passes through a phase adjust circuit (installed only in multiple power amplifier systems) made up of U228/U231 and associated circuitry. The signal then passes through the voltage-controlled variable attenuator, U238. This attenuator is controlled via DAC (U209) and buffer (U226) via the microcontroller.
Web Interface To access the Technalogix Adrenaline Web Interface, connect an Ethernet cable to the RJ45 port on the power amplifier (back panel) to your network. The Adrenaline control system in the power amplifier should allocate an internal IP from your router or you can set this manually (see below). A computer can be plugged directly into the Ethernet port to directly access the on-board web interface.
At this will display the main page shown here: Model number and serial number of the unit are displayed in the top left of the screen. The Status Flags section provides the user with feedback from the system.
The Performance section provides the user with specific parameters and measurements in the system. Measurements that can be viewed from the Performance box are: • • • • • • Forward RF Levels as a % of Full Scale (FS) Reflected RF Levels as a % of FS DC Supply Voltage in volts RF Input Levels before attenuator as a % of Full Scale Temperature in °C VSWR Trip Point Limit (between 1.1 and 1.
Network Configuration On this page you can set the network settings. Host name shows the current webpage name (default is ADRENALINE). Enter a new name here if you wish to change this. For example entering YourCompany will make the web address http://yourcompany/index.htm HTTP Port shows the current port used for internet access, 80 or 81. Port 80 is the default and is the accepted standard. Port 81 is available because some internet providers block access to port 80 unless you pay more.
You can force a web browser to use port 81 by address to http://adrenaline:81/index.htm. To use this with an internet address will require port forwarding. Consult your routers manual to set this up. With DHCP enabled the system with automatically try to find a router and acquire an IP address. If you want to set this manually, uncheck the Enable DHCP box and enter it below then click Save Config.
SNMP Configuration Technalogix Ltd VI-66 Adrenaline Control System
The SNMP Configuration page allows you to set the SNMP communities. Set these to limit access to the system via SNMP.
Password Configuration This page allows setting of the User or Admin password. The User account allows access only to the main page. The Admin account allows access to the main and all the configuration pages. Passwords are 8 characters long. Don’t forget your password. Resetting passwords isn’t fun and may cause loss of all settings.
SNMP The Technalogix.
SNMP Traps To Enable traps Set enable traps to 1 Set the IP address to that of the receiving computer. Set the community to one of the read communities set above.
Ensure that your receiver’s port is set to 162 The system will generate a general trap on any error flag and send an 8bit value indicating the type of error.
Shown here is trap of a high temperature fault (Value 4).
The overall functions of each pin on the Remote Port are indicated in the following: DB25 pinout: Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18-25 Description Ground Forward power sample1 Reflected power sample1 Carrier off2 Carrier on2 Increase carrier level (level must have been decreased) 2 Decrease carrier level (1dB increments) 2 Do not use Reset2 Do not use High temperature flag3 High VSWR flag3 Amplifier overdriven flag3 Do not use +3.
Combiner In higher power systems that contain more than one power amplifier enclosure, there also is a combiner enclosure to combine the individual outputs of all of the power amplifier enclosures. This combiner enclosure also monitors the total power of the overall system. The following is a brief description of the operation of the monitor system found in the combiner unit, if applicable.
Section VII – Mechanical Section The heat sink in each TAUD-500 which make up the amplification stage of the TAUD-1000 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.
Section VIII - Installation This section contains installation recommendations, unpacking, inspection, and installation instructions for the power amplifier. We are sure that you are chomping at the bit to install your new system, so we recommend that you read the following sections very carefully. Building Recommendations The quality of the building is of great importance if you are to expect long life and continued performance from the power amplifier.
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. Please ensure that the intake and exhaust areas are on the same side of the building to avoid pressure differentials during windy conditions.
Electrical Service Recommendations Technalogix recommends that a qualified, licensed local electrician be consulted for the required electrical service. We suggest local electricians because: • The personnel knows the local codes • The personnel can be on site readily • 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.
Antenna and Tower Recommendations Your preliminary engineering workgroup should establish your antenna and tower requirements, both for receiving and transmitting antennas. Construction of sturdy, high quality antenna/tower systems will pay off in terms of coverage of your service area, the overall quality and saleability of your radiated signal, and reduced maintenance expenses. Technalogix provides complete turnkey antenna systems if needed.
Shelter Security The FCC requires that the transmitter or translator be secure from entry or control by unauthorized persons, and that any hazardous voltages or other dangers (including most tower bases) be protected by locks or fences as necessary to protect personnel and prevent unauthorized tampering or operation. Security of the building further implies that it be secure from wildlife. Use sturdy construction materials, including sheet metal if necessary.
Unpacking and Inspection Check the outside of the container. Carefully open the container and remove the power amplifier. Retain all packing material that can be reassembled in the event that the equipment must be returned to the factory. Exercise care in handling equipment during inspection to prevent damage due to rough or careless handling. Visually inspect the enclosure of the power amplifier for damage that may have occurred during shipment.
Location and Function of Controls and Connectors (each TAUD-500 Power Amplifier) The following illustration depicts the location of the connectors when installing each of the 500-watt 8VSB power amplifiers (TAUD-500) that comprise the TAUD-1000.
RF IN – RF input from modulator or processor after the signal is split by the 2-way splitter to go to each TAUD-500. BNC connector, 50 ohm. RF OUT – 500-watt (RMS) RF output. Connects to Combiner/Filter enclosure through phased cables to ensure phase and amplitude balance is maintained. 7/16”DIN connector, female, 50 ohm. DC IN – DC input from switching power supply. REMOTE PORT – Remote interface and control. Connector is individual pins and not serial interface.
Location and Function of Controls and Connectors (Combiner/Filter Enclosure) The following illustration depicts the location of the connectors when installing the Combiner/Filter enclosure that takes the outputs of the (2) TAUD-500, combines them, and passes the combined 1,000-watt (RMS) signal through a bandpass filter and directional coupler.
RF IN – RF inputs from each of the (2) TAUD-500 power amplifiers. Cables are a specific length to maintain phase relationship to input of combiner (contact factory for lengths). 7/16”DIN female, 50 ohm. RF OUT – 1,000-watt (RMS) RF output. Connects to user’s inline 8VSB-reading wattmeter (not included) and/or the antenna via 7/16”DIN connector, female. REMOTE PORT – Remote interface and control. Connector is individual pins and not serial interface. Pinout described in Monitor and Control section.
Location and Function of Controls and Connectors (Power Supply Enclosure) The following illustration depicts the location of the connectors when installing the Power Supply enclosure. DC OUT - DC output (30Vdc) fed independently to each of the (2) TAUD-500 Power Amplifier enclosures.
Initial Hook Up 1. Ensure that the antenna has been swept and, ideally, has a return loss of greater than 20dB (VSWR = 1.2:1). This should be done before connecting the antenna cable to the system’s output. The power amplifier’s control system allows the user to change the VSWR trip point up to a maximum level of 1.8:1. Strive for the lowest possible return loss to maximize transmission distance and improve operating performance. VSWR levels between the trip point set by the user and 1.
At this stage, the system is set up and ready to do a preliminary start up, as outlined in the following section Technalogix Ltd VIII-13 TAUD-1000 Transmitter
Section IX - Operating Procedure Assuming the previous installation instructions have been completed and cautions noted, and the power amplifier is ready to receive a properly modulated signal, proceed with the following steps to place the system in operation. The power amplifier has been factory aligned for channel frequency (per system specification), signal levels and optimum performance.
9. The front display shows the user the present status of the amplifiers. Adjust RF output power to desired level. Verify that the FWD Power reads 80 to 100% of the system’s rated power on the PA enclosure - depending on the modulation of the signal content. The system is set up for 100% rms 8VSB power, unless otherwise specified. A typical data signal with QAM64 or DVB will show differently. The output power level can be adjusted from the power amplifier’s RF Levels screen.
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. Turn the system off and unplug all of the AC inlet cords. The filter can be lifted off the fan and cleaned using an air compressor at low pressure.
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? • Is the AC power ‘ON’ to the site and the equipment? (Check fuses and circuit breakers if necessary.
Symptom High reflected power Technalogix Ltd Possible Fault Incorrect load Correction Ensure amplifier connected to transmission line Ensure correct antenna impedance (50 ohms) Check antenna tuning and VSWR.
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