OUSLU500AL500-Watt UHF Translator

Axcera-LU500AL FCC Type Acceptance Report Users Manual December 2003 5-1 5. USER'S MANUAL The user's manual for the Axcera-LU500AL system is provided as separate PDF files.

INSTRUCTION MANUAL Innovator LX Series Power Amplifier Assembly 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]

LX Series Power Amplifier Assembly Table of Contents LX Series, Rev. 0 November 25, 2003 i TABLE OF CONTENTS CHAPTER 1 INTRODUCTION SECTION PAGE 1.1 Manual Overview................................................................................. 1-1 1.2 Assembly Designation Numbers ............................................................ 1-1 1.3 Safety................................................................................................ 1-1 1.4 Maintenance ....................................................................................... 1-2 1.5 Material Return Procedure .................................................................... 1-2 1.6 Limited One-Year Warranty for Axcera Products ...................................... 1-3 CHAPTER 2 SYSTEM DESCRIPTION & REMOTE CONTROL CONNECTIONS 2.1 LX Series Power Amplifier Assembly Overview........................................ 2-1 2.1.1 Power Amplifier Module, 250 Watt ................................................ 2-1 2.1.2 Power Supply Module Assembly.................................................... 2-3 2.1.3 Front Panel LCD Display Screens .................................................. 2-3 2.2 System Operation................................................................................ 2-3 2.2.1 Principles of Operation ................................................................ 2-4 2.3 Customer Remote Connections.............................................................. 2-5 CHAPTER 3 SITE CONSIDERATIONS, INSTALLATION AND SETUP PROCEDURES 3.1 Site Considerations .............................................................................. 3-1 3.2 Unpacking the Chassis w/Modules, bandpass and trap filters..................... 3-4 3.3 Installing the Chassis w/Modules and filters ............................................ 3-4 3.4 AC Input ............................................................................................ 3-5 3.5 Setup and Operation............................................................................ 3-5 3.5.1 Input Connections ...................................................................... 3-5 3.5.2 Front Panel Screens for the Exciter/Amplifier Chassis Assembly ........ 3-7 3.5.3 Initial Turn On ..........................................................................3-14 CHAPTER 4 CIRCUIT DESCRIPTIONS 4.1 Power Amplifier Module ........................................................................ 4-1 4.1.1 UHF Phase/Gain Board ................................................................ 4-1 4.1.2 150 Watt Driver Pallet Assembly .................................................. 4-1 4.1.3 150 Watt Driver, Dual Output Board ............................................. 4-1 4.1.4 UHF Module Assembly, RF Module Pallet, Philips ............................. 4-2 4.1.5 2 Way UHF Combiner Assembly.................................................... 4-2 4.1.6 Amplifier Control Board ............................................................... 4-3 4.2 Power Supply Assembly ....................................................................... 4-5 CHAPTER 5 DETAILED ALIGNMENT PROCEDURES 5.1 Module Replacement............................................................................ 5-1 5.1.1 Initial Test Setup........................................................................ 5-1 5.2 Innovator LX Series Exciter/Amplifier Chassis Assembly ........................... 5-2 5.2.1 Linearity Correction Adjustment ................................................... 5-3 5.2.2 Frequency Response Delay Equalization Adjustment ....................... 5-4 5.2.3 Calibration of Forward Output Power Level..................................... 5-4 5.2.4 Calibration of Reflected Output Power Level ................................... 5-5 5.3 Bandpass Filter Assembly ..................................................................... 5-5 LX Series Power Amplifier Assembly Table of Contents LX Series, Rev. 0 November 25, 2003 ii TABLE OF CONTENTS - (Continued) 5.4 UHF Trap Filter Assembly ..................................................................... 5-5 5.4.1 The Effects of Tuning the Output Trap Filter ................................... 5-6 APPENDICES APPENDIX A INNOVATOR LX SERIES SPECIFICATIONS APPENDIX B DRAWINGS AND PARTS LISTS LX Series Power Amplifier Assembly Table of Contents LX Series, Rev. 0 iii LIST OF FIGURES FIGURE PAGE 3-1 1 kW Minimum Ventilation Configuration ......................................... 3-4 3-2 Front and Rear View Reconnection Drawing ..................................... 3-5 3-3 Rear View of LX Series Translator ................................................... 3-6 4-1 UHF Amplifier Module, 250 Watts ................................................... 4-2 5-1 Typical Red Field Spectrum ............................................................ 5-4 LX Series Power Amplifier Assembly Table of Contents LX Series, Rev. 0 iv LIST OF TABLES TABLE PAGE 2-1 LX Series Power Amplifier Assemblies ............................................. 2-1 2-2 Power Amplifier Status Indicators ................................................... 2-3 2-3 Power Amplifier Control Adjustments .............................................. 2-3 2-4 Power Amplifier Sample ................................................................ 2-3 2-5 Pioneer Chassis Customer Remote Connections........................ 2-5 3-1 Rear Chassis Connections for LX Series Translator ............................ 3-6 3-2 Menu 01 Splash Screen #1 ............................................................ 3-7 3-3 Menu 02 Splash Screen #2 ............................................................ 3-7 3-4 Menu 10 Main Screen.................................................................... 3-7 3-5 Menu 11 Error List Access Screen ................................................... 3-8 3-6 Menu 12 Translator Device Data Access Screen ................................ 3-8…

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LX Series Power Amplifier Assembly Chapter 1, Introduction LX Series, Rev. 0 1-1 Chapter 1 Introduction This manual explains the installation, setup, alignment, and maintenance procedures for the Power Amplifier Assembly for the Innovator LX Series 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 amplifier assembly and includes discussions on control and status indicators and remote control connections. Chapter 3 explains how to unpack, install, setup, and operate the power amplifier assembly. Chapter 4 contains circuit-level descriptions for boards and board-level components in the power amplifier. Chapter 5, Detailed Alignment Procedures, provides information on adjusting the power amplifier and the system for optimal operation. The appendices contain assembly and subassembly drawings and parts lists and the 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 translators and associated power amplifier assemblies 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 assembly. 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 power amplifier assembly and 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 amplifier assembly 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. LX Series Power Amplifier Assembly Chapter 1, Introduction LX Series, Rev. 0 1-2 Ventilation – Openings in the cabinets and modules front panels are provided for ventilation. To ensure the reliable operation of the amplifier assembly, 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 LX Series Translator 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 modules. 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 modules. When the front panels of the modules 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 modules 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 amplifier assembly and translator be recorded from the LEDs on the modules and the LCD system metering on the control/monitoring module at least once a month. It is suggested that this data be retained in a rugged folder or envelope. 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…

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LX Series Power Amplifier Assembly Chapter 2, Amplifier Assembly Description & Remote Control Connections LX Series, Rev. 0 2-1 Chapter 2 Amplifier Assembly Description & Remote Control Connections 2.1 LX Series Power Amplifier Assembly Overview The (A3) power amplifier assembly in the LX Series contains modular television amplifiers that slide into the assembly. There is also needed one external Power Supply Module Assembly for every two PA modules, which also slide into the Power amplifier assembly, under the PA Modules. Four PA modules and two Power Supply modules are the maximum number of modules in a Power Amplifier Assembly. The RF output of the (A2) exciter/driver at the “N” connector J25 connects to the power amplifier assembly at the “N” connector J200. A system serial cable connects from the Power Amplifier Assembly at J232 to J34 on the exciter/driver assembly. If more than two PA modules are used then another serial port J233 is also connected to the exciter/driver. The output of the amplifier assembly at the “N” connector J205 is cabled to A9 the bandpass filter for the system. The filtered output can connect to (A10) the Optional 1 section or 2 section trap filter that provides even more filtering as needed. The filtered output is connected to A11 a coupler assembly that supplies a forward and reflected sample to the A4 Visual/Aural Metering Board. The Visual/Aural Metering Board supplies reflected, visual and aural output power samples to the exciter/driver for metering purposes. The RF output for the translator is at J2 the 7/8” EIA connector on the A11 coupler assembly. The LX Series power amplifier assembly is made up of the modules and assemblies listed in Table 2-1. Table 2-1: LX Series Power Amplifier Assemblies ASSEMBLY DESIGNATOR ASSEMBLY NAME PART NUMBER Chassis Assembly CB001274 A3 Power Amplifier Assembly, 250 Watt 1302868 Power Supply Assembly 1302893 A11 Coupler Assembly A4 Visual/Aural Metering Board 1265-1309 2.1.1 Power Amplifier Module Assembly, 250Watt (1302868; Appendix B) The Power Amplifier Module Assembly is made up of (A6) an Amplifier Control Board (1301962), (A1) a UHF Phase/Gain Board (1303213), (A2) a 150 Watt Driver Pallet Assembly (1303293), (A3 & A4) two RF Module Pallets, Philips (1300116), and (A5) a 2-Way Combiner Board (1303208). The Power Amplifier Module contains Broadband LDMOS amplifiers that cover the entire UHF band with no tuning required. Each module amplifies the RF to a nominal 300W output power. The Power Amplifier assembly is used to amplify the RF output of the Translator/Exciter Driver. A cable, located on the rear chassis, connects the RF output from the Exciter/Driver at J25 LX Series Power Amplifier Assembly Chapter 2, Amplifier Assembly Description & Remote Control Connections LX Series, Rev. 0 2-2 to J200 the RF input to the PA Assembly. This module contains RF monitoring circuitry for both an analog and a digital system. Control and monitoring lines to the Power Amplifier module are routed through the floating blind-mate connector of the Control & Monitoring/Power Supply module. The 100 Watt Translator/Exciter Driver Power Amplifier module and any External Amplifier modules contain the same control and monitoring board. This board monitors RF output power, RF reflected power, the current draw of amplifier sections, the supply voltage, and the temperature of the PA heat sink. The RF power detector circuit outputs vary with operating frequency. These circuits must be calibrated at their intended operating frequency. Front panel adjustment potentiometers are used to calibrate the following: Table 1: Power Amplifier Calibration Adjustments in Analog Systems R201 Reflected Power Cal R202 Forward Power Cal R204 Meter Offset Zero In analog systems, the Aural power of an Exciter Driver Power Amplifier and the Aural power of any external amplifier will not be reported by the system Control Monitoring module. Additionally the Visual power of these amplifiers, is reported as Forward Power just like in digital systems. In analog systems, aural and visual power will only be reported for the final system RF output. In digital systems, the Forward power of an Exciter Driver Power Amplifier and the Forward power of any external amplifier, is reported by the system Control Monitoring module. If the Control Monitoring module is monitoring a 5-50 Watt Digital or 10- 100 Watt Analog Translator, system power is measured in the Power Amplifier module. The wired connections are transferred through the power supply connector to the backplane board on a five position header. All four positions of control board switch SW1 must be set on to route these lines as the system's RF power signals. In systems of output power greater than 50 Watts digital or 100 Watts aural, system power is monitored by an external module that is connected to TB31 and control board SW1 switches must be set off. The Forward Power of the Translator/Exciter Driver Power Amplifier module is routed to the Upconverter module as AGC #1. A system over- drive condition is detected when this value rises above 0.9 VDC. When an over-drive condition is detected, the Upconverter module reduces its RF output level. For values less than 0.9 VDC, the Upconverter uses this voltage for automatic gain. LX Series Power Amplifier Assembly Chapter 2, Amplifier Assembly Description & Remote Control Connections LX Series, Rev. 0 2-3 Table 2-2. Power Amplifier Status Indicator LED FUNCTION ENABLED (Green) When lit Green, it indicates that the PA is in the Operate Mode. If a Mute occurs, the PA will remain Enabled, until the input signal is returned. DC OK (Green) When lit Green, it indicates that the fuse protected DC inputs to the PA module are OK. TEMP (Green) When lit Green, it indicates that the temperature of the heatsink assembly in the module is below 78 ̊C. MOD OK (Green) When lit Green, it indicates that the PA Module is operating and has no faults. Table 2-3. Power Amplifier Control Adj…

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LX Series Power Amplifier Assembly Chapter 3, Site Considerations, Installation and Setup Procedures LX Series, Rev. 0 3-1 Chapter 3 Site Considerations, Installation and Setup Procedures There are special considerations that need to be taken into account before the LX Series Power Amplifier Assembly and exciter/driver assembly 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 requires an AC input line of 220 VAC @ 5 amps for the Driver Assembly and an AC line for each 500 Watt Amplifier Assembly of 220 VAC @ 17 amps maximum. The LX Series Translators are designed and built to provide long life with a minimum of maintenance. The environment in which they are 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 module in the translator contains a thermal interlock protection circuit that will shut down that module 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 are designed and built into the translator will remove the heat from within the modules, 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. This amount can be determined for a 100W translator by subtracting the average power to the antenna (69.5 watts) from the AC input power (675 watts) and taking this number in watts (605.5) and then multiplying it by 3.41. This gives a result of 2,065, the BTUs to be removed every hour. 12,000 BTUs per hour equals one ton. Therefore, a 1/4- ton air conditioner will cool a 100W translator. 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 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. LX Series Power Amplifier Assembly Chapter 3, Site Considerations, Installation and Setup Procedures LX Series, Rev. 0 3-2 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 the translators. 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 of cooling air. 4. Interlocking the translator with the air conditioner is recommended to keep the translator from operating without the necessary cooling. 5. The periodic cleaning of all filters is a must. When using ventilation…

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LX Series Power Amplifier Assembly Chapter 4, Circuit Descriptions LX Series, Rev. 0 4-1 Chapter 4 Circuit Descriptions The RF from the exciter/driver assembly connects from the RF Output “N” Jack J25, through a RG-55 cable, to the PA RF Input SMA Jack J200, located on the rear of the PA chassis assembly. The RF Input is cabled through UT-141 to port J111 on the main chassis. Jack J1 on the PA module assembly connects to the J111 port when the module assembly is slid into place. The RF output from the 2 way UHF combiner connects to the PA RF Output Jack J2, located on the rear of the PA Module. Jack J2 on the PA module connects to the J115 port, on the main chassis assembly, when the module assembly is slid into place. 4.1 (A4) Power Amplifier Module Assembly (1302868; Appendix B) The Power Amplifier Module Assembly contains (A1) a UHF Phase/Gain Board (1303213), (A2) a 150W Driver Pallet, Dual Output (1303293), (A3 & A4) UHF RF Module Pallet Assemblies (1300116), (A5) a 2 Way UHF Combiner Assembly (1303208), (A6) an Amplifier Control Board (1301962) and (A7) a Temperature Sensor IC. 4.1.1 (A1) UHF Phase/Gain Board (1303213; Appendix B) The RF input from J1 on the PA assembly connects to J1 on the Phase/Gain Board. The UHF phase/gain board provides the circuits that adjust the gain and the phase of the RF signal for the PA amplifier assembly in which it is mounted. The input signal connects to the gain circuit through the capacitor C13. The gain circuit consists of U1, R16, CR4, R22, R17, CR5, R23, R27 and the gain pot, R25. U1 is a 90°, 2-way splitter. The signal at pin 1 of U1 is split and applied to pins 3 and 4. The signal reflects off CR4 and CR5 and is passed to pin 2. The gain between pins 1 and 2 changes with the voltage applied across CR4 and CR5. This voltage is controlled by the gain-adjust pot R25. The more positive the voltage, the more the diodes CR4 and CR5 conduct therefore the less gain through the circuit. The gain controlled output is coupled through C14 and the pi-type divider circuit consisting of R8, R5 and R9 that drops the level before it applied to the phase-shifter circuit. The level controlled signal connects to the phase-shifter circuit that consists of U2, C20, C21, CR2, and CR3. U2 is a 90°, 2- way splitter. The signal at pin 1 of U2 is split and applied to pins 3 and 4. The signal reflects off CR2 and CR3 and is passed to pin 2. The phase shift between pins 1 and 2 changes with the voltage applied across CR2 and CR3. This voltage is controlled by the phase-adjust pot R24 through R26, R18 and R19. +12 VDC from an external switching power supply is applied to J3 on the board and is used as the reference that is applied to the phase-control pot. The gain and phase controlled output connects to J2 on the board. 4.1.2 (A2) 150 Watt Driver Pallet Assembly, Dual Output (1303293; Appendix B) The output of the Phase/Gain Board is connected to the input J1 of (A2) the 150 Watt UHF amplifier assembly. The assembly contains a 150 Watt CW UHF Driver Board, Dual Output (1303169). 4.1.3 150 Watt Driver, Dual Output (1303169; Appendix B) The board operates class AB and is a highly linear broadband amplifier for the frequency range of 470 to 860 MHz. It can deliver an output power of 150 watts (CW) with approximately 14 dB of gain. LX Series Power Amplifier Assembly Chapter 4, Circuit Descriptions LX Series, Rev. 0 4-2 The amplification circuit consists of LDMOS transistors Q1 and Q2 connected in parallel and operating class AB. The paralleling network is achieved with the aid of 3 dB couplers U3 and U4. The quiescent current settings are achieved by means of potentiometers R6 and R10. C39 and C38 are adjusted for best response. The settings are factory implemented and should not be altered. PIN diode VR1 is a variable-damping circuit that is used to adjust the amplification of the module. The adjustment is performed with the Gain potentiometers R10 and R6. A readjustment of the amplification may be required, after repair work, to ensure that the PAs in multiple PA translators deliver the same output power. 4.1.4 (A3 & A4) UHF Module Assembly, RF Module Pallet, Philips (1300116;Appendix B) The UHF Module Assembly, 250-watt module (Figure 4-1) is a broadband amplifier for the frequency range 470 to 860 MHz. The amplifier is capable of delivering an output power of 70 W rms . The amplification is approximately 13 dB. The amplification circuit consists of the parallel connected push-pull amplifier blocks V1 and V2 operating in class AB. In order to match the transistor impedance to the characteristic impedance of the input and output sides, matching networks are placed ahead and behind the amplifier blocks. Transformers Z3 to Z6 serve to balance the input and output signals. The paralleling circuit is achieved with the aid of 3-dB couplers Z1 and Z2. The working point setting is factory implemented by means of potentiometers R9, R11, and R12 and should not be altered. V 1 3 dB Coupler Z 2 RF Output RF Input 3 dB Coupler Z 1 R 2 R 1 Matching Network Matching Network V 2 Matching Network Matching Network Z 3Z 5 Z 4Z 6 +Uop N 1 R 11R 12 R 9 R 10 Dynamic Figure 4-1. UHF Amplifier Module, 250 Watts 4.1.5 (A5) 2 Way UHF Combiner Assembly (1303208; Appendix B) The 2 Way UHF combiner board assembly combines the two outputs of the UHF Module Assemblies and also provides forward and reflected power samples of the output to (A6) the amplifier control board where it connects to the input of the overdrive-protection circuit. The RF inputs to the 2 way UHF combiner assembly, from the UHF amplifier modules, are soldered to …

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