OUS837B-55000-Watt UHF Translator

INSTRUCTION MANUAL 837B 4-6 kW UHF TRANSLATOR AXCERA, LLC 103 FREEDOM DRIVE P.O. BOX 525 LAWRENCE, PA 15055-0525 USA (724) 873-8100 • FAX (724) 873-8105 www.axcera.com • [email protected]

4-6 kW UHF Translator Table of Contents 837B, Rev. 0 i February 24, 2003 TABLE OF CONTENTS CHAPTER 1 INTRODUCTION Section # Page # 1.1 Manual Overview................................................................................. 1-1 1.2 Assembly Designators .......................................................................... 1-1 1.3 Safety................................................................................................ 1-1 1.4 Maintenance ....................................................................................... 1-2 1.5 Material Return Procedure .................................................................... 1-2 1.6 Warranty for Axcera Products – Limited One-Year Warranty...................... 1-3 1.6 Introduction Material............................................................................ 1-4 CHAPTER 2 SYSTEM DESCRIPTION 2.1 System Overview................................................................................ 2-1 2.1.1 UHF Exciter Assembly ................................................................. 2-1 2.1.2 2-3 kW Amplifier Arrays .............................................................. 2-2 2.1.2.1 (Optional) External Exhaust Kit ................................................. 2-4 2.1.3 Transmitter Output Assemblies .................................................... 2-4 2.2 Control and Status............................................................................... 2-5 2.2.1 UHF Exciter Tray ........................................................................ 2-6 2.2.2 UHF Amplifier Trays, LDMOS ........................................................ 2-8 2.3 Input and Remote Connections ............................................................. 2-9 2.4 Main AC Input ....................................................................................2-13 CHAPTER 3 INSTALLATION AND SETUP PROCEDURES 3.1 Site Considerations .............................................................................. 3-1 3.2 Unpacking the Cabinets and Trays ......................................................... 3-4 3.3 Installing the Cabinets and Trays........................................................... 3-6 3.3.1 AC Connection to the UHF Exciter Cabinet ..................................... 3-6 3.3.2 AC Connection to the Amplifier Cabinets........................................ 3-6 3.3.2 AC Connection to the Amplifier Cabinets........................................ 3-6 3.3.2.1 Three Phase AC Connection to the Amplifier Cabinets ................... 3-6 3.3.2.2 Single Phase AC Connection to the Amplifier Cabinets .................. 3-7 3.3.3 Output Connections .................................................................... 3-7 3.4 Setup and Operation............................................................................ 3-8 CHAPTER 4 CIRCUIT DESCRIPTIONS 4.0 UHF Exciter Assembly .......................................................................... 4-1 4.0.1 Control and Status...................................................................... 4-1 4.0.2 RF, Baseband Input and Remote Connections ................................ 4-1 4.0.3 AC Input ................................................................................... 4-2 4.1 UHF/VHF Receiver Tray ........................................................................ 4-2 4.1.1 (A7) Filter.................................................................................. 4-3 4.1.2 Dual Stage Amplifier Assembly..................................................... 4-3 4.1.3 (A9) Channel Filter ..................................................................... 4-3 4.1.4 Downconverter Amplifier Assembly ............................................... 4-3 4.1.5 Channel Oscillator Assembly ........................................................ 4-3 4.1.6 (A5-A1) Multiplier Board.............................................................. 4-4 4.1.7 (A6) LO Filter ............................................................................. 4-4 4.1.8 IF Filter/ALC Board ..................................................................... 4-4 4-6 kW UHF Translator Table of Contents 837B, Rev. 0 ii February 24, 2003 TABLE OF CONTENTS (continued) Section # Page # 4.1.9 (Optional) SAW Filter/Amplifier Board ........................................... 4-4 4.1.10 (Optional) IF Amplifier Board...................................................... 4-5 4.1.11 (Optional) IF Filter/Limiter Board ................................................ 4-5 4.1.12 (Optional) IF PLL Board ............................................................. 4-5 4.1.13 (Optional) IF Carrier Oven Oscillator Board .................................. 4-5 4.1.14 +12V(3A)/-12V Power Supply Board ........................................... 4-6 4.2 UHF Exciter ........................................................................................ 4-6 4.2.1 (Optional) Aural IF Synthesizer Board, 4.5 MHz .............................. 4-6 4.2.2 (Optional) Sync Tip Clamp/Modulator Board................................... 4-8 4.2.3 (Optional) Delay Equalizer Board .................................................4-11 4.2.4 (Optional) IF Carrier Oven Oscillator Board ...................................4-12 4.2.5 ALC Board, NTSC.......................................................................4-13 4.2.6 IF Phase Corrector Board............................................................4-19 4.2.7 Transmitter Control Board ..........................................................4-21 4.2.8 Channel Oscillator Assembly, Dual Oven.......................................4-26 4.2.9 (Optional) VCXO Assembly, Dual Oven .........................................4-26 4.2.10 (Optional) EEPROM FSK Identifier Board .....................................4-27 4.2.11 (Optional) Composite 4.5-MHz Filter Board .................................4-27 4.2.12 (Optional) 4.5-MHz Bandpass Filter Bo…

Text truncated - open the document above for the full version.

4-6 kW UHF Translator Chapter 1, Introduction 837B, Rev. 0 1-1 Chapter 1 Introduction This manual explains the installation, setup, alignment, and maintenance procedures for the 837B 4-6 kW solid state UHF translator. It is important that you read all of the instructions, especially the safety information in this chapter, before you begin to install or operate the unit. 1.1 Manual Overview This instruction manual is divided into five chapters and supporting appendices. Chapter 1, Introduction, contains information on the assembly numbering system used in the manual, safety, maintenance, return procedures, and warranties. The second chapter describes the translator and includes discussions on system control and status indicators and remote control connections. Chapter 3 explains how to unpack, install, setup, and operate the translator. Chapter 4 contains circuit-level descriptions for boards and board-level components in the translator. Chapter 5, Detailed Alignment Procedures, provides information on adjusting the system assemblies for optimal operation. The appendices contain a sample log sheet, test data sheet, assembly and subassembly drawings and parts lists, and system specifications. 1.2 Assembly Designators Axcera has assigned assembly numbers, such as Ax (x=1,2,3...), to all assemblies, trays, and boards that are referenced in the text of this manual and shown on the block diagrams and interconnect drawings provided in the appendices. These supporting documents are arranged in increasing numerical order in the appendices. Section titles in the text for assembly or tray descriptions or alignment procedures contain the associated part number(s) and the relevant appendix that contains the drawings for that item. 1.3 Safety The UHF translators manufactured by Axcera are designed to be easy to use and repair while providing protection from electrical and mechanical hazards. Listed throughout the manual are notes, cautions, and warnings concerning possible safety hazards that may be encountered while operating or servicing the translator. Please review these warnings and familiarize yourself with the operation and servicing procedures before working on the translator. Read All Instructions – All of the operating and safety instructions should be read and understood before operating this equipment. Retain Manuals – The manuals for the translator should be retained at the translator site for future reference. We provide two sets of manuals for this purpose; one set can be left at the office while one set can be kept at the site. Heed all Notes, Warnings, and Cautions – All of the notes, warnings, and cautions listed in this safety section and throughout the manual must be followed. Follow Instructions – All of the operating and use instructions for the translator should be followed. Cleaning – Unplug or otherwise disconnect all power from the equipment before cleaning. Do not use liquid or aerosol cleaners. Use a damp cloth for cleaning. Ventilation – Openings in the cabinets and tray front panels are provided for ventilation. To ensure the reliable 4-6 kW UHF Translator Chapter 1, Introduction 837B, Rev. 0 1-2 operation of the translator, and to protect the unit from overheating, these openings must not be blocked. Servicing – Do not attempt to service this product yourself until becoming familiar with the equipment. If in doubt, refer all servicing questions to qualified Axcera service personnel. Replacement Parts – When replacement parts are used, be sure that the parts have the same functional and performance characteristics as the original part. Unauthorized substitutions may result in fire, electric shock, or other hazards. Please contact the Axcera Technical Service Department if you have any questions regarding service or replacement parts. 1.4 Maintenance The 837B is designed with components that require little or no periodic maintenance except for the routine cleaning of the fans and the front panels of the trays. The amount of time between cleanings depends on the conditions within the translator room. While the electronics have been designed to function even if covered with dust, a heavy buildup of dust, dirt, or insects will affect the cooling of the components. This could lead to a thermal shutdown or the premature failure of the affected trays. When the front panels of the trays become dust covered, the top covers should be taken off and any accumulated foreign material should be removed. A vacuum cleaner, utilizing a small, wand- type attachment, is an excellent way to suction out the dirt. Alcohol and other cleaning agents should not be used unless you are certain that the solvents will not damage components or the silk- screened markings on the trays and boards. Water-based cleaners can be used, but do not saturate the components. The fans and heatsinks should be cleaned of all dust or dirt to permit the free flow of air for cooling purposes. It is recommended that the operating parameters of the translator be recorded from the meters on the trays and the system metering control panel at least once a month. It is suggested that this data be retained in a rugged folder or envelope. A sample format for a log sheet is provided in Appendix A. Photocopies of the log sheet should be made to allow for continued data entries. 1.5 Material Return Procedure To insure the efficient handling of equipment or components that have been returned for repair, Axcera requests that each returned item be accompanied by a Material Return Authorization Number (MRA#). An MRA# can be obtained from any Axcera Field Service Engineer by contacting the Axcera Field Service Department at (724) 873-8100 or by fax at (724) 873-8105. This procedure applies to all items sent to the Field Service Department regardless of whether the item was originally manufactured by Axcera. When equipment is sent to the field on loan, an MRA# is included with the unit. The MRA# is intended to be used when the unit is …

Text truncated - open the document above for the full version.

4-6 kW UHF Translator Chapter 2, System Description 837B, Rev. 0 2-1 Chapter 2 System Description The 837B is a complete 4-6 kW UHF Solid State Internally Diplexed Television Translator which operates at a nominal Visual Output Power of 4000 - 6000 Watts Peak of Sync and Average Aural Output Power of 400 - 600 Watts, at an A/V Ratio of 10 dB, 10 % Sound or 200 - 300 Watts at 13 dB, 5 % Sound. The 837B is made up of three Cabinets, a UHF Single Exciter Cabinet and two Amplifier Array Cabinets. 2.1 System Overview The standard 837B is functionally comprised of (A1) a Single UHF Exciter Assembly, (A2 & A3) two 2-3 kW Amplifier Array Assemblies, (A4) a Hybrid Combiner Assembly and (A11) an Output Coupler Assembly. A sample is taken from the Hybrid Combiner and connected to (A7) a Directional Coupler. 2.1.1 (A1) UHF Exciter Assembly (1278-1400; Appendix C) The (A1) UHF Exciter Assembly is made up of the trays and assemblies listed in Table 2-1. Table 2-1. UHF Exciter Assembly Trays and Assemblies MAJOR ASSEMBLY DESIGNATOR TRAY/ASSEMBLY NAME PART NUMBER A1 UHF Exciter, M/N 1142458 A3 2-way splitter assembly ZSFC-2-2SMA A4 Phase/Gain Tray 1245-1200 A5 Phase/Gain Tray 1245-1200 A6 Metering Panel 1136811 A7 UHF receiver tray 1265-1100 A8 AC Distribution Assembly 1245-1500 A9 Remote Interface Assembly 1245-1801 The UHF Exciter Tray operates using either the IF Output from the (A7) UHF Receiver Tray connected to J1 on the ALC Board (1265-1305) or the Combined IF Output generated from the (Optional) Baseband Audio and Video Inputs connected to J32 on the ALC Board. The two IF Outputs are connected to the IF Relays K3 and K4, located on the ALC Board and by applying or removing a Jumper on Jack J8 Pins 10 & 11 located on (A9) the Remote Interface Assembly (1245-1801) the IF Output is selected. To select the output from the Modulator, J8-10 and 11, must be connected together. To select the output from the Receiver Tray, J8-10 and 11, must not be connected together. The UHF Receiver Tray (1265-1100) takes the received RF On Channel Frequency and generates a 45.75 MHz + 41.25 MHz Combined IF Output. The Combined IF Output of the Receiver Tray connects to J6 on the rear of the (A1) UHF Exciter that is wired to J1 on the ALC Board. With Receiver selected, no connection between J8-10 and 11 on the Remote Interface Assembly, the IF Output from the Receiver Tray connects through the Relays to the rest of the ALC Board. The (Optional) Baseband Audio, from TB1 or J3, and Video, from J1, connect to the UHF Exciter which produces a Combined IF Output that connects to J32 on the ALC Board. 4-6 kW UHF Translator Chapter 2, System Description 837B, Rev. 0 2-2 To select the output from the Modulator, J8-10 and J8-11, must be connected together. The Exciter RF Output of the (A1) UHF Exciter at J15 (+10 to +20 dBm) is connected to the S Input on (A3) the Splitter. The Exciter Output is split two ways by A3 with RF Output #1 connected to the input of the (A5) Variable Phase/Gain Tray (1245-1200) and RF Output #2 connected to the input of the (A4) Variable Phase/Gain Tray (1245-1200). The Variable Phase/Gain Tray sets the phase and gain adjustments of the RF to provide maximum output when the outputs of the two Amplifier Arrays are combined. The output of the (A4) Variable Phase/Gain Tray (+16 dBm) connects to (A2) the Side A 2-3 kW Amplifier Array Assembly. The output of the (A5) Variable Phase/Gain Tray (+16 dBm) connects to (A3) the Side B 2-3 kW Amplifier Array Assembly. The 208/240 VAC Input to the UHF Exciter Assembly connects to (A8) the AC Distribution Assembly, UHF Exciter Assembly (1245-1500) located in the right, center rear of the Cabinet. The Assembly contains the Terminal Block (TB1) to which the 208/240 VAC connects. Line 1 to TB1-1A, Line 2 to TB1-3A and Safety Ground to TB1-2A. The AC Distribution Assembly contains (CB1) the Main Circuit Breaker (20 Amps) that supplies the AC to the rest of the Single Exciter Assembly. The output of CB1 has three MOVs, VR1, VR2 and VR3, connected to it, VR1 from Line 1 to ground, VR3 from Line 2 to ground and VR2 connected across the two lines. The AC output of CB1 is wired to A1 and A2 that are IEC Outlet Strips. The (A1) Exciter and the (A4) Variable Phase/Gain Tray plug into the (A1) IEC Outlet Strip. The (A5) Variable Phase/Gain Tray, the (A6) Metering Panel and the (A7) Receiver Tray plug into the (A2) IEC Outlet Strip. When the Circuit Breaker CB1 on the Single UHF Exciter Assembly is switched On, +12 VDC from the Exciter is connected to A9-TB1 in each of the Amplifier Array Cabinets. The +12 VDC is split 4-6 Ways on the terminal block A9-TB1 and connected to each of the UHF Amplifier Trays at J3-7. The +12 VDC is used for operation of the LED Status Indicators in the UHF Amplifier Tray. The +12 VDC is also connected to J4-20 and then to A9-TB2 for the (Optional) External Exhaust Kit in each Amplifier Array. When the UHF Exciter Tray, Translator, is switched to Operate, an Enable is applied to each of the 2-3 kW Amplifier Arrays at J4-15 that connects to A9-TB2. The Enable is split 4-6 Ways on the terminal block A9-TB2 and connected to each of the UHF Amplifier Trays at J3-9. This Enable turns on the +32 VDC Power Supply in each Amplifier Tray. Also a Fan Enable is connected to J4-19 and then to A9-TB2 that connects to the (Optional) External Exhaust fan mounted on the roof of each Amplifier Array Cabinet, turning it On. 2.1.2 (A2 & A3) 2-3 kW Amplifier Arrays (1278-1300; Appendix C) The (A2 & A3) 2-3-kW Amplifier Arrays are identical and are made up of the trays and assemblies listed in Table 2-2. 4-6 kW UHF Translator Chapter 2, System Description 837B, Rev. 0 2-3 Table 2-2. Amplifier Array Trays and Assemblies MAJOR ASSEMBLY DESIGNATOR TRAY/ASSEMBLY NAME PART NUMBER A1, A2, A3, A4, A5(5kW) & A6(6kW) UHF Amplifier Trays, LDMOS (Low Band) 1301560, (Mid Band) 1301561, Or (High Band) 1301562 A7 4, 5 or 6 Way Combiner Various A8 Output Coupler Assembly 1016-1043 A12…

Text truncated - open the document above for the full version.

4-6 kW UHF Translator Chapter 3, Installation and Setup Procedures 837B, Rev. 0 3-1 Chapter 3 Installation and Setup Procedures There are special considerations that need to be taken into account before the 837B can be installed. For example, if the installation is completed during cool weather, a heat-related problem may not surface for many months, suddenly appearing during the heat of summer. This section provides planning information for the installation and set up of the translator. 3.1 Site Considerations The Translator consists of three cabinet assemblies, the Exciter Cabinet Assembly and two Amplifier Array Assemblies. The Exciter Cabinet Assembly requires an AC Input of 208/240 VAC, Single Phase with a rating of 20 Amps. Each of the Amplifier Array Assemblies requires an AC Input of 208/240 VAC, three Phase with a rating of 55 Amps or Single Phase with a rating of 100 Amps. Check that the site has the voltage requirement needed. The 837B is designed and built to provide long life with a minimum of maintenance. The environment in which it is placed is important and certain precautions must be taken. The three greatest dangers to the translator are heat, dirt, and moisture. Heat is usually the greatest problem, followed by dirt, and then moisture. Over-temperature can cause heat-related problems such as thermal runaway and component failure. Each amplifier tray in the translator contains a thermal interlock protection circuit that will shut down that tray until the temperature drops to an acceptable level. A suitable environment for the translator can enhance the overall performance and reliability of the translator and maximize revenues by minimizing downtime. A properly designed facility will have an adequate supply of cool, clean air, free of airborne particulates of any kind, and no excessive humidity. An ideal environment will require temperature in the range of 40° F to 70° F throughout the year, reasonably low humidity, and a dust-free room. It should be noted that this is rarely if ever attainable in the real world. However, the closer the environment is to this design, the greater the operating capacity of the translator. The fans and blowers designed and built into the translator will remove the heat from within the trays, but additional means are required for removing this heat from the building. To achieve this, a few issues need to be resolved. The first step is to determine the amount of heat to be removed from the translator room. There are generally three sources of heat that must be considered. The first and most obvious is the heat from the translator itself. The following example is for a 5000 Watt Transmitter. The heat can be determined by subtracting the average power to the antenna (3225 watts) from the AC input power (20,000 watts). This number in watts (16,775) is then multiplied by 3.41, which gives 57,202.75, the BTUs to be removed every hour. 12,000 BTUs per hour equals one ton; as a result, a 5-ton air conditioner will cool a 5-kW transmitter. The second source of heat is other equipment in the same room. This number is calculated in the same way as the equation for BTUs. The third source of heat is equally obvious but not as simple to calculate. This is the heat coming through the walls, roof, and windows on a hot summer day. Unless the underside is exposed, the floor is usually not a problem. Determining this number is usually best left up to a qualified HVAC technician. There are far too many variables to even estimate this number without reviewing the detailed drawings of the site that show all of the construction details. The sum of these 4-6 kW UHF Translator Chapter 3, Installation and Setup Procedures 837B, Rev. 0 3-2 three sources is the bulk of the heat that must be removed. There may be other sources of heat, such as personnel, and all should be taken into account. Now that the amount of heat that must be removed is known, the next step is to determine how to accomplish this. The options are air conditioning, ventilation, or a combination of the two. Air conditioning is always the preferred method and is the only way to create anything close to an ideal environment. Ventilation will work quite well if the ambient air temperature is below 100° F, or about 38° C, and the humidity is kept at a reasonable level. In addition, the air stream must be adequately filtered to ensure that no airborne particulates of any kind will be carried into the translator. The combination of air conditioning for summer and ventilation during the cooler months is acceptable when the proper cooling cannot be obtained through the use of ventilation alone and using air conditioning throughout the year is not feasible. Caution: The use of air conditioning and ventilation simultaneously is not recommended. This can cause condensation in transmitters. For tube-type transmitters, this can be especially serious if the condensation forms in the tube cavity and creates damaging arcs. The following precautions should be observed regarding air conditioning systems: 1. Air conditioners have an ARI nominal cooling capacity rating. In selecting an air conditioner, do not assume that this number can be equated to the requirements of the site. Make certain that the contractor uses the actual conditions that are to be maintained at the site in determining the size of the air conditioning unit. With the desired conditioned room temperature under 80° F, the unit must be derated, possibly by a substantial amount. 2. Do not have the air conditioner blowing directly onto the translator. Under certain conditions, condensation may occur on, or worse in, the translator. 3. Do not separate the front of the translator from the back with the thought of air conditioning only the front of the unit. Cooling air is drawn in at the front of all translators and in the front and back of others. Any attempt to separate the front of the translator from the rear of the unit will adversely affect the flow…

Text truncated - open the document above for the full version.

4-6 kW UHF Translator Chapter 4, Circuit Descriptions 837B, Rev. 0 4-1 Chapter 4 Circuit Descriptions 4.0 (A1) UHF Exciter Assembly (1278-1400; Appendix C) The (A1) UHF Exciter Assembly contains (A1) a UHF Exciter Tray (1142458 or 1245-1100), (A4 & A5) two Variable Gain/Phase Trays (1245- 1200), (A6) a Metering Panel (1136811 or 1245-1400), (A7) a UHF Receiver Tray (1142479 or 1265-1100), (A8) an Exciter AC Distribution Assembly (1245-1500) and (A9) a Remote Interface Assembly (1245-1801). The (A7) UHF Receiver Tray, uses the ON Channel RF input, at J5 for 75Ω or J1 for 50Ω, and produces a Combined IF output at J4 that connects to the UHF Exciter at J6. The (A1) UHF Exciter Tray, if the Optional Modulator Kit is present in the tray, takes the Baseband Audio and Video Inputs and mixes them with internally generated 45.75 MHz and 41.25 MHz Ifs that combines them. The Combined IF, from the Receiver Tray or from the Modulator Kit, is upconverted to the On Channel RF output frequency by mixing it with a L.O. signal generated by the Channel Oscillator Assembly. The RF Output of the UHF Exciter at J15 connects to (A3) a Splitter which splits the RF two ways with the RF Output #1 connected to the input of the (A5) Variable Gain/Phase Tray (1245-1200) and the RF Output #2 connected to the input of the (A4) Variable Gain/Phase Tray (1245-1200). The output of the (A4) Variable Gain/Phase Tray connects to (A2) the Side A Amplifier Array Assembly. The output of the (A5) Variable Gain/Phase Tray connects to (A3) the Side B Amplifier Array Assembly. 4.0.1 Control and Status The Control and Status of the Translator are provided by the Meter indications on the Metering Panel and the Variable Gain Phase Trays. There are also Control, Status and LED Indications located on the front panel of the UHF Exciter Tray. The switches and LED indicators, which are mounted so that the switches and LEDs are operated or viewed from the front Panel of the UHF Exciter, are part of the Transmitter Control Board (1245- 1101). On the UHF Exciter Tray, switch (S1) is an Operate/Standby Switch that provides the Operate Commands (Enables), when in Operate, to each of the Amplifier Arrays. The power supply Enable is needed to turn on the Switching Power Supplies located in each of the UHF Amplifier Trays. The Fan Enable is needed to turn on the exhaust fan in the (Optional) External Exhaust Kit. When the UHF Exciter is in Operate, the Green LED (DS2) is On and when in Standby the Amber LED (DS1) is On. NOTE: If the Translator does not switch to Operate, when S1 is switched to Operate, check that a Dummy Jumper Plug is connected to Jack J7, with a Jumper between Pins 1 & 2, located on (A9) the Remote Interface Assembly in the Single UHF Exciter Assembly. The Jumper provides the Interlock to the UHF Exciter needed for the operation of the Translator. If the Interlock is present, the Green LED (DS5), located on the Transmitter Control Board, should be lit. Operation of the Translator is controlled by the front panel switches located on the UHF Exciter Tray. During Normal operation of the Translator, Switch S2 should be in the Auto position. The front panel of the UHF Exciter also has LEDs that indicate a Video Fault (Loss), 4-6 kW UHF Translator Chapter 4, Circuit Descriptions 837B, Rev. 0 4-2 Red LED (DS9) and a VSWR Cutback, Amber LED (DS7). 4.0.2 RF, Baseband Input and Remote Connections The RF, Baseband Video and Audio Inputs to the Translator, connect to the (A9) Remote Interface Panel located on the rear of the Single UHF Exciter Assembly. The On Channel RF input connects to the “F” connector J3 for 75Ω or the “N” connector J1 for 50Ω. If the (Optional) Modulator Kit is present, the Baseband Video Input connects to Jack J2 that is wired to J1 on the Exciter. The Baseband Audio Input connects to the Terminal Block TB1 for Balanced Audio or to Jack J6 that is wired to J3 on the Exciter, for Composite, Stereo, Audio. Remote Monitoring and Operation of the Translator is provided through the Jacks (J8, J9 & J10) located on (A9) the Remote Interface Assembly mounted toward the rear of the Single UHF Exciter Assembly. Jack (J7) should have a dummy plug connected to it, which has a jumper connected between Pins 1 & 2, that provides the Interlock to the Exciter needed to operate the Translator. If the Jumper is missing, the Translator will not switch to Operate. If remote connections are made to the Translator they should be made through the plugs provided in the Installation Material as noted on the Interconnect Drawing (1278-8400) for the Single UHF Exciter. 4.0.3 AC Input The Single UHF Exciter Assembly needs an AC input of 208/240 VAC at 20 Amps. The AC Input to the Single UHF Exciter Assembly connects to (A8) the AC Distribution Assembly, UHF Exciter Assembly (1245-1500) located in the right, center rear of the Cabinet. The Assembly contains the 4 Terminal Block (TB1) to which the 208/240 VAC connects. Line 1 to TB1-1A, Line 2 to TB1-3A and Safety Ground to TB1-2A. The AC Distribution Panel contains CB1 one 20 Amp Circuit Breaker that supplies the AC to the rest of the Single Exciter Assembly. The Input AC is connected to (CB1) the Main AC Circuit Breaker (20 Amps). The output of CB1 has three MOVs, VR1 connected from Line 1 to ground, VR3 connected from Line 2 to ground and VR3 connected across the two legs. The AC output of CB1 connects to A1 and A2 that are IEC Outlet Strips. The (A1) Exciter Tray and the (A4) Variable Gain/Phase Tray plug into the (A1) IEC Outlet Strip. The (A5) Variable Gain/Phase Tray, the (A8) Metering Panel and the (A7) Receiver Tray plug into the (A2) IEC Outlet Strip. When the Circuit Breaker CB1, mounted on the AC Distribution Assembly, is switched On, +12 VDC from the Exciter, is supplied to the two Amplifier Arrays fo…

Text truncated - open the document above for the full version.