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Harris Intelligent Transmitter Platinum-i Series Technical Manual

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TECHNICAL MANUAL
888-9058-001
Platinum-i Series Intelligent
Transmitter™
Platinum-i Series Intelligent Transmitter™
T.M. No. 888-9058-001
© Copyright Harris Corporation 2008, 2010
Rev B, 20 May, 2010
All rights reserved

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  • Page 1 TECHNICAL MANUAL 888-9058-001 Platinum-i Series Intelligent Transmitter™ Platinum-i Series Intelligent Transmitter™ T.M. No. 888-9058-001 © Copyright Harris Corporation 2008, 2010 Rev B, 20 May, 2010 All rights reserved...
  • Page 2 HARRIS Service Parts Department. Telephone 217/222-8200 to contact the service parts department or address correspondence to Service Parts Department, HARRIS CORPORATION, Broadcast Systems Division, P.O. Box 4290, Quincy, Illinois 62305-4290, USA. The HARRIS factory may also be contacted through a FAX facility (217/221-7096). NOTE: The # symbol used in the parts list means used with (e.g.
  • Page 3 Manual Revision History Platinum-i Series Intelligent Transmitter™ Technical Manual Date Description 22Apr2010 P43417 Released 20May2010 P47546 Revised Title Page, MRH, and Step-2 on Page-90 Guide to Using Harris Parts List Information 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...
  • Page 4 • In the ten digit part numbers, if the last three numbers are 000, the item is a part that Harris has purchased and has not manufactured or modified. If the last three numbers are other than 000, the item is either manufactured by Harris or is purchased from a vendor and modified for use in the Harris product.
  • Page 5 ______________________________________________HARRIS list (because each table is normally sorted in ascending order). Most Harris made or modified assemblies will have 9xx xxxx xxx numbers associated with them. The term “SEE HIGHER LEVEL BILL” in the description column implies that the reference designated part number will show up in a bill that is higher in the tree structure.
  • Page 6 ______________________________________________HARRIS 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...
  • Page 7 HARRIS CORPORATION shall not be responsible for injury or damage resulting from improper procedures or from the use of improperly trained or inexperienced personnel performing such tasks. During installation and operation of this equipment, local building codes and fire protection standards must be observed.

  • Page 8: Table Of Contents

    ______________________________________________HARRIS Table of Contents Percent of Cabinet Power 3 Cab..28 Platinum-i Series Analog Percent of Cabinet Power 4 Cab..29 Transmitter Specifications....30 Section 1 Section 2 Introduction Installation Introduction....13 Introduction....33 Transmitter Configurations..13 Installation Planning...33 Organization of Transmitter Doc.14 Space Requirements....35 GeneralDescription....15 Weights......35 AC Power Distribution...16 RF System Layout....35...
  • Page 9 ______________________________________________HARRIS Table of Contents (continued) J34 Optional Status....49 Updating the eCDi™.....88 Transmitter Check Out.....49 Before Starting....88 Control Cabinet Pre-Operational...49 Main Controller SerialProgram..91 3 Phase AC and Logic SupplyCheck..49 Exciter Switcher....92 GUI Setup......50 AGC Module.....93 PA Cabinet Checkout....51 PA Cabinets....95 Module Installation....53 Slave Controller Indicators..95 Control System Check Out..53 RF PA Module LED Display..97...
  • Page 10 ______________________________________________HARRIS Table of Contents (continued) Slave Controller....148 Life Support Backup....133 Controller Area Network(CAN)Bus..133 Sheet 1......148 Sheet 2......149 Main Controller....135 Transmitter Control....135 Sheets 3 and 4....149 Sheet 5......149 Graphical User Interface (GUI)...135 Remote Controls....135 Sheet 6......150 Sheet 7......150 Control Panel & Indicator Dis..135 Introduction.....137 Sheet 8......150 Sheet 9......150...
  • Page 11 ______________________________________________HARRIS Table of Contents (continued) Module Troubleshooting..186 Section 7 Platinum Module Test Fix..187 PA Cabinet Troubleshooting-Module Swap..189 Troubleshooting Blink Codes..189 Introduction.....163 Isolating Other Failures..194 Theory of Operation....163 Locating Failed RF FETs..196 AC Power Flow....163 DC Resistance Test.....196 Fan and air flow monitoring..163 Idle Current Test....196 Interlock Circuits....163 Parts Replacement Proced..197...
  • Page 12 ______________________________________________HARRIS NOTES: 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 13: Platinum-I Series Analog

    Transmitter Introduction ______________________________________________________________________ 1.1 Introduction This manual is desrcibes the Harris Analog Platinum-i series of solid state VHF transmitters which include the following models with their peak sync power ratings. Larger models are available by request. Each model is rated for 10% aural.

  • Page 14: Organization Of Transmitter Doc

    ______________________________________________HARRIS NOTE: The HT60HS/LS Standard configuration system uses 2 Aural/Driver cabinets. 1.1.2 Organization of Transmitter Documentation • The documentation consists of: a. Platinum-i Analog Technical Manual (this manual) b. Platinum-i Analog Drawing Package for High Band or for Low Band c.

  • Page 15: Generaldescription

    ______________________________________________HARRIS Figure 1- HT10HSi/LSi 1.2 General Description The Analog Platinum-i consists of a control cabinet, one or more power amplifier cabinets (PA). and RF output system. The RF system includes a color notch filter, harmonic filter and a vision plus sound RF combiner feeding the antenna. The eCDi version of the control cabinet will be used with new Platinum-i cabinets and as a retrofit to older PA cabinets.

  • Page 16: Ac Power Distribution

    ______________________________________________HARRIS Another use will be to retrofit existing analog transmitters to digital service. These PAs will continue to use the 12 or 17 visual PA module configuration as the digital power amplifier. Platinum Series transmitters employ rugged field effect transistors (FETs), parallel amplifier modules, multiple power supplies, and a high-resolution flat display screen for monitoring.

  • Page 17: Transmitter Control System

    ______________________________________________HARRIS 1.2.2 Transmitter Control System See Figure 1-5. The control system for the transmitter consists of a main controller mounted in the control cabinet, plus individual slave controllers mounted in each amplifier cabinet. Data from the system is interfaced through the monitor board to the display controller, and shown on the front panel flat display screen as bar graphs and numerical readings.

  • Page 18: Control Cabinet

    ______________________________________________HARRIS 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 19: Control System Block Diagram

    ______________________________________________HARRIS Figure 1-5, Control System Block Diagram 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 20: Volt Power Supply

    ______________________________________________HARRIS Each slave controller controls a cabinet’s fan motor, 50 volt DC supplies, and RF amplifier modules. Slave controllers also report cabinet door interlock status, air interlock status, module faults, and power supply faults to the main controller. Cabinet input drive and RF power output samples, detected by RF peak detectors, are relayed to the main controller through the slave controllers as well.

  • Page 21: Transmitter Agc Module

    ______________________________________________HARRIS IF signal to the transmit frequency, and the resulting signal is bandpass filtered and amplified. The exciter’s final amplifier is capable of supplying up to 1 watt peak sync to subsequent stages, and a sample of its output is routed to the exciter’s AGC circuit to hold the exciter’s power output constant.
  • Page 22 ______________________________________________HARRIS  15 kW (Standard) In a 15 kW system, the AGC module’s output feeds a driver module, which drives a PA module. In a low band transmitter, the PA’s output is split in a 16-way divider, whose outputs feed 16 PA modules. The outputs are recombined in a 16-way combiner, whose output becomes the cabinet’s visual output.

  • Page 23: Aural Signal Path

    ______________________________________________HARRIS In low band systems, the four outputs are sent to four driver modules, which in turn are used to drive four PA modules. These four outputs drive four 15 kW visual PA cabinets (see 15 kW system, above). In high band transmitters, the four phase and gain module outputs to four driver modules.

  • Page 24: Phase And Gain

    ______________________________________________HARRIS As in the visual signal path, in higher-powered systems, it may become necessary to feed parallel signal paths through one or more phase and gain modules. These modules allow the gain and phase of each path to be trimmed, so that the proper phase and amplitude relationships are obtained at the final combiner input.

  • Page 25: Transmitter Output Networks

    ______________________________________________HARRIS  60 kW Systems, 10% Aural (standard) The AGC module output feeds a phase and gain module. In high band systems, the two outputs are then fed to two preamps. In low band transmitters, the preamps are not necessary. Each of the two outputs feeds a driver module.

  • Page 26: Main Controller Board

    ______________________________________________HARRIS and Output, I/O. It gathers status and fault data from the individual sub-systems and reports that information to the operator locally and by remote control. 1.3.1.2 PA Cabinet Slave Controller This board interfaces with the module and power supply controller boards to transfer information to the main controller.

  • Page 27: Signal Interface

    ______________________________________________HARRIS 1.3.3 Signal Interface Signal interface for signal input and monitoring by remote control is located on top of the control cabinet. The PA cabinet top is used for the control and monitoring cable interconnect with the PA cabinet(s) and the monitor sample cables. 1.3.4 RF PA Cabinets The PA cabinets have independent: •...

  • Page 28: Platinum Rf Combining Para

    ______________________________________________HARRIS average power levels while maintaining out of band emission specifications by filtering IMD product near the mask filter shoulder. Some RF systems contain channel combiners, allowing two or more channels to share the same transmission line and antenna. Directional coupler units develop RF samples for metering RF power levels and are used as feedback samples for the exciter real time correction circuits.
  • Page 29 ______________________________________________HARRIS 1.4.0.3 Percent of Power With Four PA Cabinets CABINETS CABINETS AB/CD COMBINED A & B REJECT C & D REJECT REJECT OUTPUT BOTH BOTH BOTH NONE BOTH BOTH This information can be used to calibrate the power metering for the cabinet and reject loads.

  • Page 30: Specifications

    ______________________________________________HARRIS 1.3 Specifications 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...
  • Page 31 ______________________________________________HARRIS 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...
  • Page 32 ______________________________________________HARRIS 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 33: Introduction

    The transmitter equipment installation phases should be planned carefully before the equipment arrives and a detailed plan worked out and written down. Know what installation equipment and materials Harris is supplying with the transmitter and what equipment and materials the station must supply. In general, a transmitter installation requires that the following areas be addressed: a.
  • Page 34 ______________________________________________HARRIS c. When considering the sequence of events during an installation, it is important to approach the transmitter, its peripherals, and the building as a system. “typical” drawings are used as references. It must be assumed special requirements will cause deviations from the published installation drawings in order to accommodate a particular configuration or building requirement.

  • Page 35: Space Requirements

    ______________________________________________HARRIS l. The electrical and RF plumbing work should begin at the start of the installation in order not to delay completion, however the transmitter, RF output system and cooling system plumbing should be installed prior to running electrical conduits or air handling ducts in the transmitter space.

  • Page 36: Air System

    The maximum transmitter operating temperature is 50 degrees C at sea level (de-rate 2 C degrees for each 1000 feet above sea level). A high altitude fan blade is available if this rating is exceeded. Contact Harris field service for information and application assistance when high altitude operation is required.

  • Page 37: Air Conditioning

    Each cabinet is fed from the distribution panel through a separate circuit breaker. If fuses are used, contact Harris Field Service for guidance on fuse sizing and phase loss protection. Starting Surge Requirement...

  • Page 38: Isolation Transformer

    ______________________________________________HARRIS Disconnect Location NOTE: The circuit breaker panel should be located near the transmitter in a well lighted area. As a safety precaution, controls for disconnecting the main power service supplying the transmitter must be convenient to the operator and maintenance personnel.

  • Page 39: Inventory And Inspection

    The contents of the shipment should be as indicated on the packing lists. If the contents are incomplete, or if any part is damaged electrically or mechanically, notify the Harris TV Customer Service Department: Harris Corporation,...

  • Page 40: Cabinet Placement And Leveling

    ______________________________________________HARRIS 2.4 Cabinet Placement and Leveling Four bolts hold each cabinet to its skid. They are located two per side, front and rear. Also, remove the blocks that support the bottom of each rear door. Use a chalk line or similar method to mark the floor position for each cabinet to ensure even alignment.

  • Page 41: Tap Transformers

    ______________________________________________HARRIS 2.6 Tap Transformers The two (optional four) power supplies in the control cabinet, the supply with each slave controller in the PA cabinets, and the 50 volt power supplies should be tapped for the correct line voltage. It will be easier to re-tap the 50 volt supplies before installation. See the following drawings: •...

  • Page 42: Ac Primary Wiring

    ______________________________________________HARRIS (Refer to RF Plumbing Layout drawings.) Because almost every station is different, refer to the suggested layout for information for location of hybrids, loads, couplers and filters. Install the directional couplers for each cabinet first, and work from there out toward the loads and antenna. Note where multiple PA cabinet installations require equal line lengths into hybrids.

  • Page 43: Input Signal Wiring

    ______________________________________________HARRIS Run the cables from the control cabinet through the cable tray to each PA cabinet. Observe the mechanical keying of the ribbon cable. The RF sample lines may be installed in the cable tray as well. Use the RF sample lines furnished if they are long enough.

  • Page 44: External Blower Control

    ______________________________________________HARRIS 2.13.3 Individual PA Cabinet External Interlocks DANGER: THE THERMAL INTERLOCK SWITCHES ON HYBRID REJECT LOADS MUST BE CONNECTED TO INTERLOCK OFF AFFECTED TRANSMITTER CABINETS TO PREVENT OPERATOR EXPOSURE TO HOT OIL SPILLING FROM A REJECT LOAD ABSORBING EXCESSIVE POWER. Each PA cabinet has an interlock circuit that is used to turn off the appropriate PA cabinets when a reject load thermal interlock opens.

  • Page 45: Remote Control I/O

    ______________________________________________HARRIS 2.14 Remote Control I/O: Three "D" connectors for parallel remote control interface: • J31 Command in • J32 Status out • J33 Analog out • J34 Optional Exciter Switcher (Refer to Control Cabinet Wiring Diagram.) 2.14.1 Command In The Command inputs are all opto-coupled and require a current source to energize the LED.

  • Page 46: Command Functions

    ______________________________________________HARRIS The functions marked (OPT) are used when the optional exciter switcher is installed. Command Functions: TRANSMITTER ON: Turns transmitter on and enables RF output. TRANSMITTER OFF: Turns transmitter off and disables RF output. RAISE/LOWER: Raises or lowers the transmitter output power. SELECT EXCITER (OPT): Selects exciter "A"...

  • Page 47: Status Functions

    ______________________________________________HARRIS EXCITER MUTE EXCITER FAULT PA CABINET POWER SUPPLY FAULT PA CABINET MODULE FAULT PA CABINET COOLING AIR LOSS PA DOOR INTERLOCK SPARE 1 FAULT NOT USED GROUND OPTIONAL STATUS VOLTAGE INPUT Status Functions: TRANSMITTER ON: Indicates the state of the transmitter. The line will be asserted low when the transmitter is on.

  • Page 48: J33: Analog Outputs

    ______________________________________________HARRIS MODULE FAULT: Indicates one or more of the cabinet RF modules has faulted off. Asserted low upon fault. AIR LOSS: Indicates one or more of the cabinets has lost air supply. Asserted low upon loss of cabinet pressure. DOOR INTERLOCK: Asserted low if one or more of the cabinet doors is open. SPARE FAULT: Not used at this time.

  • Page 49: J34 Optional Status

    ______________________________________________HARRIS J34 OPTIONAL STATUS 1: EXCITER A SELECTED 2: EXCITER B SELECTED 3: MANUAL SELECTED 4: FUTURE OPTION 5: FUTURE OPTION 6: GROUND 7: GROUND 8: GROUND 9: VOLTAGE, This voltage follows the main status selection choice. Optional Status Functions: EXCITER A SELECTED: Indicates exciter "A"...

  • Page 50: Gui Setup

    ______________________________________________HARRIS Remove cover over the AC terminal blocks and carefully measure the AC line STEP 3: voltages. Verify correct voltage and connections. Refer to the control cabinet wiring diagram 843-5583-001, sheet 3. If the voltage does not correspond to the values for the power supplies as wired, STEP 4: then re-tap the supplies for the correct voltage.
  • Page 51 ______________________________________________HARRIS The fail-safe and external interlocks are active and may be on or off. External site system wiring must be connected to these interlock terminals or jumpers must be added at the terminals to turn these indicators off before the transmitter can be turned on. The exciter should indicate mute.

  • Page 52: Pa Cabinet Checkout

    ______________________________________________HARRIS 2.15.2.1 PA Cabinet Checkout Perform the following for each PA cabinet: TURN OFF BOTH BREAKERS located behind the lower two bottom removable STEP 1: extrusion panel on the front of the PA cabinet. Unplug the three pin plug at J2 on the slave controller board. This places the local STEP 2: slave controller in total control of the cabinet.

  • Page 53: Module Installation

    ______________________________________________HARRIS Check air switch operation by momentarily shutting off CB2. STEP 7: Check door interlock operation by opening the rear door while cabinet is STEP 8: running. When the door is opened while the power supplies are on, the door must remain open for 10 seconds to allow the 50 volt capacitor bank to totally discharge and allow the SCR to reset.

  • Page 54: Initial Applctn Rf Visual Power

    ______________________________________________HARRIS water. The positive pressure inside the cabinet may be measured by temporarily removing a mounting screw from one of the cover plates on the top rear of the cabinet. Check that all modules are enabled, PA modules will illuminate the left STEP 7: half of the green LED.

  • Page 55: Initialapplctn Rf Aural Power

    ______________________________________________HARRIS PA cabinet systems, begin with the (A / B) and (C / D) phase and gain modules, then proceed to the top level ([A+B] / [C+D]) module. Adjust phase and gain module phase control for minimum reject power. STEP 7: Adjust gain control for minimum reject power.
  • Page 56 ______________________________________________HARRIS Slowly raise the aural power drive while observing VSWR and FORWARD STEP 5: POWER. Note, in a multiple PA cabinet system also observe the REJECT POWER(s). Stop at approximately 50% forward power. Check to be certain the combined output at each hybrid in a multiple PA system is higher than the reject load for the hybrid.

  • Page 57: Power Calibration

    ______________________________________________HARRIS Switch AGC back ON when done and RAISE power to 100%. STEP 14: NOTE: Refer to AGC adjustments if needed. 2.17 Power Calibration 2.17.1 Basics of Power Calibration. Power calibration is based on the use of a RF average power meter such as those manufactured by Agilent.

  • Page 58: Pa Cabinet Power Calibration

    ______________________________________________HARRIS Verify the RF level, 40 to 60mW. STEP 2: Connect the 20 dB pad to the reflected input, connect the cable to the pad. STEP 3: Use the service screen to calibrate the reflected power metering to read STEP 4: one percent of the forward power.

  • Page 59: Aural Power Calibration

    ______________________________________________HARRIS 2.17.3 Aural Power Calibration 2.17.3.1 System Forward Power Some of the power calibrations are based on forward power, calibrate it first. Using the precision coupler in the RF system and the precision power STEP 1: meter to establish the output power. Verify the RF level at the board input, the signal should be between 40 to STEP 2: 60 mW.

  • Page 60: Three And Four Cabinet Calibra

    ______________________________________________HARRIS 2.17.3.5 Three and Four Cabinet Calibration Using the tables below calibrate the reject loads. Data is in cabinet power percentages. CABINET CABINET CABINET AB/C COMBINED REJECT REJECT OUTPUT 16.6 33.3 16.6 33.3 66.6 33.3 66.6 133.3 16.6 133.3 Figure 2-3 Three Cabinets CABINETS CABINETS AB/CD...

  • Page 61: Aural Vswr Calibration

    ______________________________________________HARRIS The following things can be done to help in the VSWR fault checking. • To check the fault point without foldback interaction, simply set the foldback point to a higher value than the desired fault point. After checking, remember to set the foldback to the desired lower point.

  • Page 62: Power Limit

    ______________________________________________HARRIS 2.20 Power Limit The exciter has a power limit adjustment, Increase the output power to 110%. The exciter power limit should be set to limit the transmitter power to 110%. At 110 % power, note the exciter power and enter this value as power limit. 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 63: Software Installation/Setup

    BEFORE SERVICING EQUIPMENT. 3.2 eCDi™ and the Platinum-i™ Transmitter For the Harris Platinum-i l VHF Transmitter, the eCDi™ control concept includes a local GUI touchscreen interface in addition to its normal networking capabilities. In the transmitter the eCDi™ is the local transmitter control interface using the 12" VGA touchscreen and has been named the "Display Unit."...

  • Page 64: Hardware

    Email Notification - faults and warnings are automatically sent to a customer configured email address. SNMP Agent - provides for connection to the Harris Broadcast Manager (HBM)or RECON remote control system. It can also be connected, in a limited form, to other non-Harris based SNMP Network Managers.

  • Page 65: Web Gui

    ______________________________________________HARRIS Remote Software Updates and Upgrades - eCDi™ uses In-System Programming (ISP) that allows remote loading of software updates and upgrades. eCDi™ Interfaces eCDi™ allows access to transmitter control and monitoring via the following interfaces: • Web GUI • SNMP Agent •...

  • Page 66: Snmp Agent

    NOTE: The eCDi can also be accessed by other non-Harris SNMP Network Managers. In this case, the MIB (Management Information Base) is a common MIB that is used by nearly all Harris transmitters. A second “Extended” MIB exists and is exclusively used by the Harris Broadcast Manager.

  • Page 67: Security

    ______________________________________________HARRIS a. Level 1 - Transmitter Remote Status Monitoring and Control. This allows monitoring and control of virtually all transmitter parameters (limited to the information that is available on the serial port of the transmitter). For most of the listed transmitters, if it is available locally at the transmitter, it will be available via the Web GUI.

  • Page 68: Setup

    ______________________________________________HARRIS Hardware: • Pentium III 400 MHz (Intel PIII+-compatible, 1GHz+ recommended) • 128MB RAM (256MB or more recommended) • 75MB of available hard drive space • Mouse (mouse-wheel recommended) • 28.8k modem (56k modem recommended or high speed TCP/IP network if available) •...

  • Page 69: Detailed Installation Procedures

    ______________________________________________HARRIS NOTE: For SNMP connection to a network manager such as the Harris Broadcast Manager, refer to eCDi manual after installing the eCDi™. Use of the Web Browser interface is discussed in " Section 3 Operation". IMPORTANT: All ethernet cables connected to the eCDi™ should be shielded twisted pair (STP) category 5 (Cat 5) cable.

  • Page 70: Ecdi™ Configuration

    ______________________________________________HARRIS Figure 3-2 CD-1A Exciter, S3 Location 3.11 eCDi™ Configuration Now that the eCDi™ unit is turned on, connect an external computer with a 10 base T network connection directly to the ethernet port on the front of the eCDi™ using the provided ethernet cable labeled “Configure.”...
  • Page 71 ______________________________________________HARRIS Figure 3-3 Changing the Remote Computer IP Address To access the eCDi™ and the configuration screens, open a browser STEP 2: (such as IE or Netscape) and type one of the following into the Address bar of the browser and press Enter: (these addresses are only implemented in eCDi™...

  • Page 72: Troubleshooting Tips

    ______________________________________________HARRIS Figure 3-4 eCDi™ Login Screen 3.11.1 Troubleshooting Tips 1. When using DHCP, connection problems can occur if the computer fails to release it old IP address. To check this: (Do not type the quote marks) a. Open a DOS Prompt and type “ipconfig” and press enter. This should return an IP address in the range of 192.168.217.1 to 192.168.217.49.
  • Page 73 ______________________________________________HARRIS NOTE: If connection cannot be made, try setting the remote computer to a fixed IP address. Select “Use the following IP address” as shown to the right. Then enter the IP address 192.168.217.1 with a subnet mask of 255.255.255.0 (this address is only valid if you have eCDi™...
  • Page 74 ______________________________________________HARRIS IMPORTANT: To run eCDi™ requires that the Java 2 Runtime Environment plug-in be loaded. If the computer used to access the eCDi™ does not have this plug-in installed, it will be automatically downloaded from the eCDi™ and the screen in Figure 3-5 will appear asking if you want to load the plug-in.
  • Page 75 ______________________________________________HARRIS Figure 3-6 Configuration Login Screen (Administrator password required) Type in the following and then press OK: STEP 4: User Name - admin Password - admin (This can and should be changed immediately, once the configuration screens are accessed). When the login is accepted the main menu will appear as shown in Figure 3-7. STEP 5: Click on General to open the screen in Figure 3-8.
  • Page 76 ______________________________________________HARRIS Figure 3-8 General Configuration Screen Set a new administrator password. Although shown checked here, the “Allow STEP 6: remote administration” checkbox should only be checked if you want to be able to access these configuration screens via the station LAN or WAN. If this box is not checked, then only a local connection to the front of the eCDi™...
  • Page 77 ______________________________________________HARRIS When all changes are made, press Submit and then press Back to return STEP 10: to the main menu. Select Feature Key on the main menu to get the screen shown in Figure STEP 11: 3-9. The Feature key number is normally entered at the factory before shipment, but is also recorded in the Factory Test Data included with the unit.
  • Page 78 ______________________________________________HARRIS Once the information is entered, submitted and verified, press Back to STEP 13: return to the main menu. Click on User mgmt to access the User Management screen in Figure 3-10. To add users, Type in a Username and password and then select their STEP 14: level of access: Engineer, Operator or Monitor (none of these can change configuration).
  • Page 79 NOTE: If your network supports Default DNS then the host name can be used to access the eCDi™. IF not, the IP address must be used. Example: http://137.237.242.26 or http://my-ecdi.bpd.harris.com or whatever is enabled in HostName and Domain Name). 888-9058-001...
  • Page 80 ______________________________________________HARRIS SNMP Manager Configuration. In the “Add IP Address” box, type in the STEP 18: IP addresses of the computers to which all SNMP trap messages will be sent. To delete a trap destination, use the “Delete IP Address” pull down menu and select the destination to be deleted.
  • Page 81 ______________________________________________HARRIS If you are using SNMP v3 (version 3) then User Names and Passwords must STEP 23: be entered for each user. Simply type the User Name and Password into the text boxes and press Submit. Users may be deleted by using the delete user pull down menu.
  • Page 82 ______________________________________________HARRIS NOTE: If an address is entered incorrectly simply delete it and add it again. The station Network Administrator should be able to supply the SMTP STEP 28: Server IP and the eCDi email address. The email address is used as the sender address, so recipients know from where the email was sent.
  • Page 83 ______________________________________________HARRIS Figure 3-15 Email Filters • Selecting “None” (no filter) will allow all indications for the selected category to send an email alert. • Selecting “Sum” will block all Summary indications in the selected category. All other indications in that category will send an email alert. •...
  • Page 84 ______________________________________________HARRIS The Communication settings shown here are the defaults. The Refresh and STEP 32: Retry Intervals should only be changed if connection problems are experienced. Enable SSL (Secure Socket Layer) encryption is an option for added security, but keep in mind that this will slow down the overall connection and could take several minutes to obtain the encryption key.
  • Page 85 ______________________________________________HARRIS Set Fault Log Filters. Fault Log filters (new as of eCDi™ firmware STEP 33: revision 3.0.L) provide a way to block or limit the entries in the Fault Log. Figure 3-17 shows the choices for the 3 categories of filters: a.

  • Page 86: Apply Changes

    ______________________________________________HARRIS For information on setting up: The Meterlog: see eCDi manual page 3-7 Performance Monitoring alarms: see eCDi manual page 3-18 Figure 3-18 Meterlog and Performance Monitoring Configuration Screens 3.11.2 Apply Changes Once all of the Configuration information is entered on the individual screens, you must click on “Apply.”...

  • Page 87: Backing Up The Configuration

    ______________________________________________HARRIS 3.11.3 Backing Up the Configuration On the Configuration main menu (shown in Figure 3-19) click on <<Download to save the configuration to a file. This will bring up a window asking if you want to save the file to disk and the file will be called “ecdi_config.zip.”...

  • Page 88: Ecdi Software Updates

    ______________________________________________HARRIS 3.12 eCDi Software Updates This section provides instructions necessary to install software updates on the eCDi™. The procedure is very simple but could require 20 minutes or more to upload the new software but only about 2 minutes to upgrade at which time the eCDi™ will be offline. Please Read before updating Software Please note that as of software revision 2.6.K (and higher) the fixed eCDi™...
  • Page 89 ______________________________________________HARRIS Open a connection to the eCDi™. This will bring up the screen shown in STEP 1: Figure 3-20. Click on “Service eCDi” (upper left portion of the screen) and then select “Upgrade”. This will open the window in Figure 3-21. Figure 3-20 Upgrade Login 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...
  • Page 90 ______________________________________________HARRIS Type in the Administrator username and password. If login is successful, STEP 2: this will open the screen in Figure 3-22. Default User Name – admin Default Password – admin Figure 3-21 Administrator Login Browse for the upgrade file “eCDi.bin” and then click on Submit. This STEP 3: will upload the file to the eCDi™...

  • Page 91: Main Controller Serialprogram

    1. Apply power to target board. 2. Connect 9 pin serial cable from PC to DB-9F connector. 3. Start Harris In System Programming application version 1.10, HarrisISP.exe (861- 1121-191). This will be furnished with the updated software 4. Select the appropriate COM port which you connected in step 2.

  • Page 92: Exciter Switcher

    ______________________________________________HARRIS 3.14 Exciter Switcher (Optional) Figure 3-19. Optional Exciter Switcher Table 3-1. Optional Exciter Switch 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 93: Agc Module

    ______________________________________________HARRIS 3.15 AGC Module VERIFICATION OF AGC OPERATION 1. Reduce transmitter power to 50%. 2, Set AGC MODE switch to OFF. 3. Raise transmitter power back to 100%. 4. Set AGC MODE switch to ON. 5. Verify AGC action reduces transmitter power.
  • Page 94 ______________________________________________HARRIS Figure 3-25. HX 1V Exciter Front Panel Table 3-3. HX 1V Exciter Controls and Indicators 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 95: Pa Cabinets

    ______________________________________________HARRIS 3.16 Exciter Operation 3.16.1 Controls and Indicators Refer to Figure 3-25 for the location of controls and indicators associated with day-to-day standard operation of the HX-1V exciter. The function of each control and indicator is listed in Table 3-4. 3.17 PA Cabinets 3.17.1 Circuit Breakers Circuit breakers are located behind the lower panel of each amplifier cabinet.
  • Page 96 ______________________________________________HARRIS for data. In transmitters with only a single amplifier cabinet, the monitor board only monitors one slave controller; it does so continuously, and the LED should remain lighted continuously. 3.17.2.8 Cabinet ON Switch This is a local ON switch for emergency and troubleshooting purposes. A local ON command is not possible while the control cabinet main controller is in the OFF state and sending this OFF command to the slave controller.

  • Page 97: Rf Pa Module Led Display

    ______________________________________________HARRIS Figure 3-27. 50 Volt Power Supply Control Board Controls and Indicators 3.17.3 RF PA Module LED Display 3.17.3.1 Green Bar LED The left half of the green LED indicates that the module is enabled, and the right half indicates the presence of RF drive. Both halves off indicates that the module has been disabled due to a “mechanical disable”...

  • Page 98: Operation

    ______________________________________________HARRIS 6. PASS FET (Problem in the PA module power supply pass transistor circuit) NOTE: The module fault display is given priority in numerical order. If more than one fault is present, the fault with the smallest number of blinks is displayed. For example, if both VSWR and RF overdrive conditions exist, the red LED will blink once in each cycle.

  • Page 99: Power Raise/Lower

    ______________________________________________HARRIS 3.18.3 Power RAISE/LOWER The power RAISE and LOWER buttons on the main control panel duplicate the exciter RAISE and LOWER switches. Upon depressing one of these switches on the main controller, the appropriate command is relayed to the exciter. In transmitters with optional dual exciters, the RAISE/LOWER commands are routed only to the exciter currently enabled;...
  • Page 100 ______________________________________________HARRIS e. Measure the transmitter sample at test point TX,and adjust SET pot for the same or slightly less, voltage that the exciter sample. NOTE: It may be necessary to add or delete attenuation pad(s) in transmitter sample line to obtain proper voltage. f.

  • Page 101: Operation

    ______________________________________________HARRIS Section 4 Operation ____________________________________________________________________ 4.1 Introduction 4.1.1 Graphical User Interface There are several levels of control in this transmitter, the top level is the Graphical User Interface, GUI. This interface utilizes a computer with a liquid crystal display. This computer can be networked or connections to other computers enabling them to control the transmitter with the same graphical user interface.

  • Page 102: Micro Controller Cpld

    ______________________________________________HARRIS 4.1.3 CPLD Complex Programmable Logic Device This is the basic level controller and gives the transmitter a critical life support functionality. This life support function is controlled by a watchdog circuit triggered when the 376 micro is unresponsive. The CPLD will control the transmitter ON/OFF state. It will respond to front panel and customer parallel remote commands.

  • Page 103: Front Control Panel

    ______________________________________________HARRIS 4.2 Front Control Panel This is the panel located in the control cabinet below the GUI display panel. Figure 4-2 Controller Panel 4.2.1 CONTROL Pushbuttons The front control panel has six control buttons, these buttons function through the CPLD to control the transmitter at the basic level. •...

  • Page 104: Auxiliary Control Panel

    ______________________________________________HARRIS • Output Fault - The output directional coupler that monitors reflected power has seen a sudden increase in reflected power. A slow increase in reflected power will result in VSWR foldback, which reduces forward power to limit the reflected to a set value. •...

  • Page 105: Gui And Ecdi Control

    GUI and remote control interface. The GUI interface has a common look and operation across all new Harris product lines. The GUI interface has a separate Technical Manual, 888-2517-001, covering the eCDi GUI interface as a computer program.
  • Page 106 This screen will appear after the network computer finishes the log on sequence. Operator will enter user name and password to access the program. The default user name is HARRIS and there is no password until one is set. NOTE: The screens shown for illustration are typical, they will change due to transmitter configuration and software versions.
  • Page 107 ______________________________________________HARRIS 4.3.3 A Short Tutorial on using the GUI Display Screen The GUI screen is a Touch screen. Simply touch the tabs/buttons to select an action. If operating by remote control on your pc, use your mouse to select a tab/button and click. Note: There are 2 types of access actions: “Tabs”...
  • Page 108 ______________________________________________HARRIS Layer 1 Layer 2 SFMCS Cab ID System/Cabinets Home |___________ Drive |________Summary |________Faults |________Meters |_____________________AGC/Visual Drive |________Control |________Service |___________PA |________Summary |________Faults |_________Cab ID 1 |_________Cab ID 2 |_ _ _ _ _ _ |________Meters |_________Cab ID 3 * |_ _ _ _ |________Control |________Service |___________Output...

  • Page 109: Gui Display Screen

    ______________________________________________HARRIS Figure 4-4 Home Screen 4.4 GUI Display Screen The home screen is the default display screen at turn on or from the logon screen. The screen has three areas. The right section is the transmitter control section, this is the GUI version of the front control panel.

  • Page 110: Fault Alarm Listing

    ______________________________________________HARRIS 4.4.1.1 Fault Alarm Listing Fault Description Fault Trigger Phase Loss 90% of Nominal Line Voltage; 60ms trip for under 300V, 1s trip for over 300V AC Low Nominal Line Voltage -10%. AC High Nominal Line Voltage +10%. External Interlock External Interlock connection opens.

  • Page 111: Control Section

    ______________________________________________HARRIS 4.4.2 Control Section This section of the GUI screen is always visible. There are two sections of this screen, selection between them is controlled by the TX and Exciter tabs at the bottom. The TX tab is active in Figure 4-4 and shows the transmitter ON and OFF buttons at the top, the digital power raise and lower buttons below and an alternate action button at the bottom for enabling or disabling the remote control.
  • Page 112 ______________________________________________HARRIS divider. The five buttons to the right of the metering screen select 5 further display screens: Summary, Faults, Meters, Control, and the Service screen. The left block titled Exciters shows which Exciter is selected and the power output of that Exciter.
  • Page 113 ______________________________________________HARRIS Figure 4-7 Drive Tab, Meters Button, Visual Driver Selected This screen displays the Exciter power and cabinet drive power in watts and percent. Figure 4-8 Drive Tab, Meters Button, AGC Selected This screen meters the AGC control voltage, if there is only one AGC, the other will meter zero.
  • Page 114 ______________________________________________HARRIS Figure 4-9 Drive Tab, Control Button This screen duplicates the control and status indicators of the exciter switcher. One additional button allows muting the RF drive by forcing the AGC output to zero. Figure 4-10 Drive Tab, Service Button This screen allows the maintenance personnel to configure the number of exciters and the number of AGC units.

  • Page 115: Pa Cabinet Tab

    ______________________________________________HARRIS 4.5.2 Power Amplifiers Tab Figure 4-11 P.A. Tab, Summary Button This screen in PA Summary mode shows the power output of each PA cabinet. The button below each meter will switch to a detailed metering display of that particular PA Cabinet.
  • Page 116 ______________________________________________HARRIS • Cabinet Communication Faults • Cooling, low air flow/pressure • Door Interlock, rear door open • External Interlock, usually used for hybrid reject load interlock • 50 Volt Power Supply Fault The green fault information turns red when the fault is active. Buttons across the bottom allow cabinet selection.
  • Page 117 ______________________________________________HARRIS Figure 4-14 P.A. Tab, Control Button This screen allows individual ON or OFF commands to be sent to each PA Cabinet. Figure 4-15 P.A. Tab, Service Button, Cab ID 3 Selected This screen is used to calibrate the individual cabinet metering parameters. 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 118: Output Tab

    ______________________________________________HARRIS 4.5.3 Output Tab Figure 4-16 Output Tab, Summary Button This page displays metering of the system: Output power, Reflected power, and calculated VSWR. It also displays the power output of each PA Cabinet. Figure 4-17 Output Tab, Faults Button Output Tab: “Faults”...
  • Page 119 ______________________________________________HARRIS • Reject Load excess dissipation fault. Refer to drawing 801-0210-011 sheet 14 for Reject Load Test Points: TP 22, TP 23, TP 24. A typical input sample is 50 mW (100mW max) average, provides about 3.0 volts DC at the above test points.
  • Page 120 ______________________________________________HARRIS Figure 4-19 Output Tab, Control Button The left buttons will allow the muting of the RF drive to the PA Chain. This button will mute the Exciter and activate the drive mute function of the AGC. If the RF switches are active, the position buttons will operate the RF switches and illuminate to indicate position and RF switch interlock status.
  • Page 121 ______________________________________________HARRIS controller circuit board. Add pads if needed to reduce the sample below the 4 volt maximum to around 3 volts. In addition, if a 3 dB pad provides the correct voltage at TP 18, it’s important to add a 3dB pad to the reflected power sample line. In a similar fashion actual reflected power can be calibrated.

  • Page 122: Power Supply Tab

    ______________________________________________HARRIS Figure 4-22 Output Tab, Service Button, RF Switch Selected When the RF switches are enabled, the RF coax switch control buttons will appear on the output control screen. 4.5.4 P.S. (Power Supply) Tab Figure 4-23 P.S. (Power Supply) Tab, Summary Button Screen displays AC Mains, Logic supply voltages, and 50 Volt supply “OK”...
  • Page 123 ______________________________________________HARRIS Figure 4-24 P.S. Tab, Faults Button This screen displays AC mains voltage sensor status. A fault indicates low line voltage or the phase sequence is reversed. Figure 4-25 P.S. Tab, Meters Button, System Selected This screen meters the control cabinet AC line voltages and Logic supply voltages when the System button is selected.
  • Page 124 ______________________________________________HARRIS Figure 4-26 P.S. Tab, Meters Button, Cabinets Selected Meters the 50 Volt Module Supplies for each PA Cabinet. Select the PA Cabinet using the Cab ID buttons. Figure 4-27 P.S. Tab, Service Button The power line voltage calibration is done on this screen. The other function is the setting of a nominal AC line voltage…this scales the bargraph.

  • Page 125: System Tab

    ______________________________________________HARRIS 4.5.5 System Tab Figure 4-28 System Tab, Summary Button Status of transmitter, remote control, external interlocks, and cabinet communication. Figure 4-29 System Tab, Faults Button This screen displays system fault areas monitored and are normally displayed in green. Actual active faults change to red. 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...
  • Page 126 ______________________________________________HARRIS Figure 4-30 System TAB, Service Screen The “Configure” column is used to select the model number of the transmitter. The “RF On Delay” column is used to adjust the RF power reduction time length used during the turn on cycle. The “Channel Number” is user selected. “External Interlock” selects a choice of transmitter functions following an external interlock open-and-restore cycle.

  • Page 127: Gui Screen Faults Sum List

    ______________________________________________HARRIS GUI FAULT MATRIX WORKSHEET SCREEN TITLE FAULT NAME FAULT NOTES WARNING DRIVE CHAIN Exciter A Summary Fault Check exciter for more information Exciter B Summary Fault Check exciter for more information Active Exciter Mute Check exciter for more information Unlock Check exciter for more information Exciter Power...
  • Page 128 ______________________________________________HARRIS NOTES: 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 129: Control System Theory

    Theory 5.1 Control System Overall Description The control system for the Harris Platinum-i series of VHF TV transmitters consists of a Control Cabinet that contains a controller board, front panel interface, and the GUI monitoring system. The main controller printed wiring board is mounted on the underside of the Input/Output panel located at the top of the control cabinet..
  • Page 130 ______________________________________________HARRIS Figure 5-1 Controller Block Diagram 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 131: Micro Module

    ______________________________________________HARRIS Figure 5-1 shows a simplified block diagram of the transmitter control system. The left side of the diagram shows the external connections to the transmitter or more specifically the External I/O Board. The right side of the diagram shows the internal control system inter-connections from the Main Controller to the various sub-systems inside the transmitter cabinet.

  • Page 132: Features Of The 376 Module

    ______________________________________________HARRIS 5.2.1.1 Features of the 376 module include: a. Built-in CAN (Controller Area Network) bus controller b. 16 A/D inputs for analog metering c. A serial EEPROM for non-volatile memory storage d. A built in clock running at 4.194MHz which will let the micro run at 16- 25MHz e.

  • Page 133: Life Support Backup

    ______________________________________________HARRIS addresses the correct I/O line on the CPLD and it then sends out the command. 5.2.2.2 Life Support Backup The CPLD monitors the watchdog circuit or more specifically the RESET line on the micro module. If the micro module stops executing its program, the watchdog circuit will activate the micro reset line and the control board in question is considered to be in "Life Support Mode".
  • Page 134 ______________________________________________HARRIS The parallel control lines are used for quick actuation of critical functions, such as ON, OFF, RF mute, AC_Low and Fault Off. These lines are also the backup control lines in a Life Support mode when the Main Controller (and therefore the CAN bus) is not operational.

  • Page 135: Main Controller

    • One serial port, is available for operator connection to run the In-System Programming or ISP software, supplied by Harris, to update the software for the Main Controller and/or any other micro in the transmitter. 5.4 Control Panel and Indicator Display The switch panel provides a local user interface that is an alternative or backup to using the touchscreen.
  • Page 136 ______________________________________________HARRIS become the operating controls at the transmitter. The switch panels are capable of turning the transmitter on and off, but no transmitter information will be given. This is possible because each area of the transmitter system has its own micro-processor control board which is capable of operating and protecting its own area.

  • Page 137: Introduction

    ______________________________________________HARRIS 5.4.1 Introduction Due to the complexity of the switch panel, the theory is broken up into the following operations: • Modes of Operation. • Button Presses • Button / Indicator Lighting • Error Messages and Indications. The following definitions may be useful: MAX 6954: A Maxim LED/Key Matrix Controller.

  • Page 138: Button / Indicator Lighting

    ______________________________________________HARRIS When a hardwired button is pressed, the switch momentarily applies ground to pull the signal line low. The signal line is connected directly to the connector J4 and sent on to the other controllers via a ribbon cable. The controller in charge of that button will acknowledge that it received the hardwired switch signal by sending back a reply with information that will tell the MAX 6954 to blink that particular switch.

  • Page 139: Button States

    ______________________________________________HARRIS indicator for that controller on the back of the front panel will blink red and an error message stating that it’s offline will scroll on the LED display in the lower right corner of the front panel. Once an offline controller starts to respond to a status request, it’s status will be changed to being online and control of the corresponding status LED will be returned to the controller.

  • Page 140: Messages In The Led Display

    ______________________________________________HARRIS The RF Switch Position buttons allow 2 customer RF system switches to change and monitor their status. The Exciter switches have the same functions as the controls on the front of the exciter switcher logic and the button LEDs will display the same information. The Power Raise and Lower buttons are used for Exciter Power control.

  • Page 141: Life Support Functionality

    ______________________________________________HARRIS ribbon cable on J4. Wait a minute or two and reconnect the ribbon cable. If the condition is not cleared, the 2UI front panel will require repair or replacement. 5.4.3 Life Support Functionality The critical life support functionality occurs when an onboard watchdog is triggered as a result of an unresponsive micro module.

  • Page 142: Module Logic

    ______________________________________________HARRIS There is a test point for the 4.096 reference voltage. There are 5 ground test points and also test points for the following control voltages. +15V, +7.5V, -15V, +5V, -5V, +3.3V, 5.4.3.4 Main Controller The Controller contains all of the overall transmitter logic and control amplifiers for: ON/OFF command, interlocking, VSWR Foldback, and VSWR Overload.

  • Page 143: Micromodule Interface (Sheet 2)

    Sheet three shows hardware that is reserved for board development and testing by Harris engineering. The Assembly Revision is a hardware revision control that uses pull down zero ohm resistors to allow the hardware revision to be accessed by the...

  • Page 144: Controller Analog Sense (Sht 5)

    ______________________________________________HARRIS microprocessor. The diagnostic LEDs flash in a regular sequence during normal operation. 5.5.1.4 RS232, Watch Dog and Front Panel Interface (Sheet 4) (Sheet 4 of the drawing shows several interfaces used in the controller) • BDM is Background Debug Mode provides for emulation and debugging for the 376 microcontroller.

  • Page 145: Cabinet Bus Controller (Sht 7)

    ______________________________________________HARRIS • Status Indicators The CPLD will give the following status indicators. A red LED will indicate a Board Reset. A red LED will indicate if the CPLD is not programmed. Two red LEDs will indicate a Faulted Off condition and a RF Mute condition. 5.5.1.7 Cabinet Bus Controller (Sheet 7) Refer to sheet seven.

  • Page 146: Interlocks (Sheet 12)

    ______________________________________________HARRIS 5.5.1.12 Interlocks (Sheet 12) The External, Failsafe and Phase loss interlocks are isolated by opto-coupler. A spare is also available for use in custom systems. The external interlock is a series system of switches, a complete set of closed switches complete the interlock.

  • Page 147: Dual Tran Interface (Sheet 16)

    ______________________________________________HARRIS In a similar manner, the output reflected power, (VIS_RFLD_PWR), is compared to a digitally controlled voltage and generated a reflected fault. The three reject loads are compared with a voltage that is calculated to be 75% of the load rating. Above this point, a warning only is generated and a fault will shut down two cabinets if the load rating is exceeded.

  • Page 148: Dc Distribution

    ______________________________________________HARRIS 5.5.1.20 DC Distribution The last sheet of the drawing shows the DC distribution and the voltage present LEDs. There is a three terminal regulator for the 3.3 volt sense. and a LM4040 is used as a 4.096 volt reference. This reference is used by the analog to digital metering circuitry and the voltage can be checked at the test point.

  • Page 149: Sheet 2

    ______________________________________________HARRIS is lit if an interlock occurs. Since this feature is not always used, J15 can be set to disable this interlock. 5.6.1.2 Sheet 2 This sheet contains the cabinet ON/OFF logic, power supply control and fault detection. ON/OFF commands are received from the main controller through J2, but if the external connection is removed from J2 the cabinet can be controlled locally with S2 and S3.

  • Page 150: Sheet 6

    This is a basically a vendor display driven by an Intel hardware computer running a version of Linux software. The only Harris built part is the interface board and it is only for interconnection of cables. Drawing 843-5575-182 is included for reference in troubleshooting the power supply output voltages or changing the hard drive.

  • Page 151: Control Cabinet

    ______________________________________________HARRIS Section 6 Control Cabinet ____________________________________________________________________ 6.1 Introduction The control cabinet contains the exciter and control elements of the transmitter. Documentation includes Wiring Diagram, Control Cabinet Common 843-5583-001 that is common to the analog and digital versions of the cabinet and for digital, Wiring Diagram Control Cabinet Digital 843-5583-003.

  • Page 152: Control Interconnects

    ______________________________________________HARRIS 6.2.1 Control Interconnects Sheet one of the drawing shows the cables that interconnect the three elements of the control system, the main controller, the display unit assembly and the control panel unit. This sheet also shows the UPS input power wiring and the output load distribution terminal block TB6.

  • Page 153: Diode Oring

    ______________________________________________HARRIS 6.2.4 Diode ORing Steering diodes are used to allow the paralleling of two supplies and protection from one supply going low in output voltage. In the dual supply option, the power supplies should have the output voltages set as close as possible to the same voltage. There are monitoring LEDs to indicate the presence of input voltages from each supply.

  • Page 154: Display Unit

    Harris transmitters that have a serial connection port. For the Platinum-I, this includes a local GUI touchscreen interface in addition to its normal networking capabilities.

  • Page 155: Operational Setup And Adj

    ______________________________________________HARRIS 6.4.1.1 Logic Card Detailed Circuit Description (Drwg: 839-7900-043) The set controls are adjusted to determine the point at which the level is considered too low to be satisfactory. When the exciter RF level is below this point, the comparator output switches to a high state and the green LED is extinguished.
  • Page 156 ______________________________________________HARRIS Figure 6-1 Power Divider Note the Exciter A Vision power output readings. STEP 1: Lower the vision power of the standby exciter (Exciter B) and observe STEP 2: the vision power level when the RF PRESENCE LED changes state. This threshold point can be changed by adjustment of the SET control.

  • Page 157: Troubleshooting

    ______________________________________________HARRIS 6.4.1.4 Troubleshooting Verify that the RF detectors have RF present and the DC output voltage is present. If this is OK, trace the DC back to the switcher logic card and check the comparator output. Using the schematic as a guide the logic can be traced to the output coax relay driver and the status driver transistors.

  • Page 158: Operational Setup And Adj

    ______________________________________________HARRIS 6.4.2.2 Operational Setup and Adjustment Vision Adjustment On the front panel of the exciter module, put the STEP 1: auto/manual switch to the Manual position. Turn the exciter down to 25% of its nominal STEP 2: value to prevent excess drive when AGC is turned off. : Now switch the AGC OFF.

  • Page 159: Phase And Gain

    ______________________________________________HARRIS NOTE: The AGC unit can be completely bypassed by a BNC barrel and an attenuator Pad of 6 to 8 dB. 6.4.3 Phase and Gain • Refer to schematic 843-5285-391 (3 sheets) The phase and gain unit provides three functions. First, it divides the RF drive signal into two paths in order to drive two separate high power amplifier chains.
  • Page 160 ______________________________________________HARRIS • Gain Monitoring: The comparators in U3 monitor the bias voltage from Q2, comparing it with two fixed and one variable reference voltage. The comparators with the fixed voltages drive red LEDs in DS4. The right red LED illuminates when the gain reaches maximum in the “B”...

  • Page 161: Operational Setup And Adj

    ______________________________________________HARRIS 6.4.3.2 Operational Setup and Adjustment A two PA cabinet system that has one phase and gain unit. Select Monitor Reject Load 1 on the “Output” screen (page) of the GUI and adjust front panel PHASE for minimum power. Then adjust GAIN for minimum reject power. Repeat phase and gain again, checking for further improvement.

  • Page 162: Troubleshooting

    ______________________________________________HARRIS 6.4.3.3 Troubleshooting • Gain check: the input to output gain should be unity when the GAIN control is in the center of the range. • The drawing is well annotated with level information and DC control voltages that help with troubleshooting.

  • Page 163: Pa Cabinet

    ______________________________________________HARRIS Section 7 PA Cabinet ______________________________________________________________________________ 7.1 Introduction The power amplifier cabinets amplify the milliwatt RF signal from the control cabinet. This cabinet is a stand alone unit containing: • Independent AC power control, using individual PA cabinet external AC disconnects. •...

  • Page 164: Scr Crowbar

    ______________________________________________HARRIS The back door is interlocked for protection from contact with AC mains voltage and the high currents available from the 50 volt power supplies. Opening the interlock removes +12 volt coil voltage from the auxiliary relay K2 resulting in no coil voltage for K1, the AC contactor.

  • Page 165: Power Divider

    ______________________________________________HARRIS 7.3.2 Vision Driver and Sound PA Cabinet The low band version uses one vision driver followed by a metering directional coupler. In the high band version, a four way power divider follows the vision driver output. Two outputs drive PA modules and two are terminated. The outputs of the two PA modules are combined with a two-way Gysel combiner.

  • Page 166: Pa Output Combiner Network

    ______________________________________________HARRIS 7.5 PA Output Combiner Network The PA outputs are then combined by a 14-way Gysel combiner to provide a combined output from each cabinet. The combiner contains isolation resistors attached to a heat pipe. These loads provide isolation between module ports, allowing shut off and removal of any module without affecting the performance of the remaining modules.
  • Page 167 ______________________________________________HARRIS The output side of this circuit (the left side of Figure 7-3, within dotted box) including the amplifiers) functions like a conventional Wilkinson combiner, it is the right side that is of interest here. At the right side, all of the 1/4 wavelength, 50 ohm transmission lines are joined together.

  • Page 168: Maintenance And Troubleshooting

    Disposable filter media is used for air filters when the pressure drop exceeds 0.5 inches. The filter media used is Harris part number 448-0921-000. This part number is for quantity one and for convenience, they can be ordered by the case of 60 filters. To purchase locally, the brand is American Air Filter, Frontline Blue, AAF part number is 627-130-500.
  • Page 169 ______________________________________________HARRIS e. Connect a source of vacuum to the tee at the manometer, and gradually supply vacuum until +12 volts appears at J-3 pin 2. f. Note the manometer reading when the air switch closes. g. Adjust the air switch threshold to -0.25 inches H20 column. Turn the adjustment screw in top of cabinet clockwise to increase the pressure differential required to activate the switch, or counter-clockwise to decrease the differential.

  • Page 170: Back Door Fan

    ______________________________________________HARRIS Figure 7-5 Test Setup 7.7.2 Back Door Fan Three phase back door motors have sealed ball bearings that require no routine lubrication. A normal failure is the bearing seals, that allow lubrication to leak out. Any sign of oil leakage indicates that the motor should be replaced or rebuilt with new bearings.

  • Page 171: Check Mov Boards

    ______________________________________________HARRIS All wiring should be periodically checked for tight connections. This is most important in the high-current circuits (cabinet AC feed, AC breaker to DC power supplies, power supply to DC bus bars, DC bus to module connectors, etc.). Also check wires for lead dress and abrasions.
  • Page 172 ______________________________________________HARRIS 7.7.7 RF Trouble Shooting Divider and Combiner 7.7.7.1 Power Divider The output power of any divider can be verified by power measurement. An analog average power meter can be used to compare outputs but does not accurately measure the power. 7.7.7.2 Combiner High Output VSWR Fault (1 blink) The cause for this fault is often external to the module.

  • Page 173: Rf Amplifier Modules

    When a module failure occurs, the module may be returned to the factory for repair. Pack carefully to avoid damage, special shipping boxes are available from Harris. USA customers may send a module in for repair by sending via Federal Express to:...

  • Page 174: Local Module Repair

    Department service your module promptly and efficiently. If you do not stock a spare module and require another unit for operation, a spare may be obtained as a rental unit from the Harris Repair Department while your unit is shipped to our factory for repair.

  • Page 175: Rf Amplifier Modules Theory

    ______________________________________________HARRIS Figure 8-1 High Band Quarter Module 8.2 RF Amplifier Modules Theory of Operation RF amplifier module assemblies are made from quarter modules, each quarter module has four RF field effect transistors (FETs). Two pairs of push-pull transistors are operated in parallel. The push-pull operation reduces distortion. Quarter modules can be connected in various series and parallel combinations.

  • Page 176: Driver Module, Lo Band (Band I)

    ______________________________________________HARRIS rear panels of drivers and PAs are mechanically keyed differently, so that Driver units cannot be plugged into PA slots. If a driver module could be installed in a PA module location or slot, the higher drive power present would destroy the input stages. The modules are "hot-pluggable,"...

  • Page 177: Driver Module, Hi Band (Band

    ______________________________________________HARRIS The low band driver module consists of a class A stage, driving a second stage consisting of two parallel class A amplifier blocks. The bias current per device will be marked on the hold-down spring clamping bar. This works for analog and digital. A pi input attenuator (R4, R5, R6 on the Driver RF input assembly) is used to set the overall gain of each low band driver to 35 dB.

  • Page 178: Pa Module

    ______________________________________________HARRIS The high band driver module consists of two cascaded class A stages, driving a third stage consisting of two parallel class AB amplifier blocks. A pi input attenuator (R4/R5/R6 on the input Driver RF interconnection assembly) is used to set the overall gain of each high band driver to 35 dB. The input attenuator also serves to improve the modules input return loss.
  • Page 179 ______________________________________________HARRIS The Wilkinson combiner in the Low Band module is a foreshortened Wilkinson combiner. Resistors are used in the Wilkinson divider and combiner circuits to provide isolation between ports. The Wilkinson dividers two outputs feeds the two 2-way Wilkinson microstrip/stripline dividers on the 2X2-Way Divider assembly.

  • Page 180: Rf Quarter Modules

    ______________________________________________HARRIS 8.2.4 RF Quarter Modules The RF amplifier subassemblies within a driver or PA module are called "quarter modules." The quarter modules use n-channel Field Effect Transistors, or FETs, as their active devices. FETs offer several advantages over bipolar junction transistors (BJTs), including improved ruggedness, better linearity, and less susceptibility to thermal runaway.

  • Page 181: High Band Quarter Module

    ______________________________________________HARRIS The upper and lower RF amplifier halves are identical. In the upper circuit, C1 blocks DC from the input. Components T2/T3 continue the impedance transformation from the divider to the gates of RF transistors Q1 and Q2. T3 also establishes a 180 phase relationship between the signal voltages sent to the two transistors, which is the basis for push-pull operation.

  • Page 182: Quarter Module Bias

    ______________________________________________HARRIS R3 and R4 shunt load the highly capacitive gate input impedance of the FETs. C2 completes the input impedance transformation. An adjustable voltage divider feeds bias voltages to the gates of the RF FETs, controlling their quiescent drain currents. Series inductors feed 50 Volts to the FET drains, and act as RF chokes, blocking the RF from appearing on the power supply lines.

  • Page 183: Protection, Cntrl & Monitor

    ______________________________________________HARRIS 8.2.8 Protection, Control and Monitor Subsystem (Refer to Module Control Board schematic, Tab 1000 in drawing package) Each module is controlled and monitored by a module protection, control, and monitor (PCM) subsystem. Drivers and PA modules utilize essentially the same PCM subsystem.

  • Page 184: Module Status Leds

    ______________________________________________HARRIS Likewise, a minimum voltage reference is established by R45 and R46. If the reference exceeds the DC supply sample, U7 pin 2 is driven high, indicating an under-voltage fault. * Monitors ISO voltage samples of the quarter modules, protecting the amplifier from damage due to imbalances between the two halves of a quarter module.

  • Page 185: Red Led Fault Blink Codes

    ______________________________________________HARRIS Left 1/2 Green LED Illuminated - Module is enabled but little or no RF drive is supplied to the module. Driver modules, because of their low input drive level, do not have a drive level indication. Thus, when a driver module is enabled, both halves of the green LED are illuminated regardless of drive level.

  • Page 186: Module Troubleshooting

    ______________________________________________HARRIS 8.3 Module Troubleshooting CAUTION: USE EXTREME CARE WHEN REPAIRING OR TESTING RF AMPLIFIER MODULES. BECAUSE THEY ARE CAPABLE OF PRODUCING OVER 1000 WATTS OF OUTPUT POWER, SERIOUS RF BURNS CAN RESULT FROM COMING IN CONTACT WITH ANY HIGH POWER POINTS INSIDE THE MODULE WHILE IT IS OPERATING.

  • Page 187: Platinum Module Test Fix

    ______________________________________________HARRIS 8.3.1 Platinum TV Module Test Fixture (Part Number: 992-8556-002, Optional Equipment) Figure 8-5 Wiring Diagram PA Module Extender (Harris PN 992-8556-002) (Drawing 843 5285 162) 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...
  • Page 188 ______________________________________________HARRIS Figure 8-6 Module Test Fixture The Platinum TV Module Test Fixture consists of a table top assembly with a interconnect cable ending in a plug assembly that is inserted into an empty module slot. The cable to the test load is routed through the end cover opposite the fan and connected inside the test fixture by reaching through the cooling slot.

  • Page 189: Troubleshooting-Module Swap

    ______________________________________________HARRIS Enable switch S1 allows local control of the module on the extender while the transmitter is on. CAUTION: AN EXTERNAL RF LOAD MUST BE CONNECTED TO THE MODULE AT ALL TIMES DURING TEST. BE SURE TO DISABLE AND REMOVE THE MODULE OR TURN OFF THE BREAKER BEFORE REMOVING THE EXTENDER FROM THE CABINET.
  • Page 190 ______________________________________________HARRIS Finally, if neither of these steps yields success, the problem may lie in a PAL or logic gate on the module control board. This type of problem is generally rare. Measuring voltages at various points in the logic circuitry on the module control board can isolate this type of problem.
  • Page 191 ______________________________________________HARRIS significantly. If the ISO voltage of any quarter module exceeds about 1.9 Volts, the control board shuts the power amplifier module down and indicates an ISO fault. An ISO fault will almost always be caused by a component failure in a quarter module (RF FET, chip cap, ISO resistor, or open solder connection).
  • Page 192 ______________________________________________HARRIS To find a problem on a quarter module, first try to locate one quarter module that is the source of the ISO fault. With DC power off and RF drive removed, connect a scope or meter to the ISO voltage line, and disconnect the 50 Volt wires from all but quarter module #1 (nearest the back of the module).
  • Page 193 ______________________________________________HARRIS inlet temperature, it should be below the maximum temperature rating of 50 C. If the temperature is more than a few degrees above outside temperature, the air supply system may not be adequate. If an improper module fault is suspected, allow the module to cool to room ambient. Re-enable the module, a real temperature fault will not cause an immediate fault, the thermal mass of the heat sink requires at least ten minuets to generate a temperature fault.

  • Page 194: Isolating Other Failures

    ______________________________________________HARRIS If open pass FETs are suspected check the voltage at collector (case) of Q1 of the Module Control Board as the module is enabled and disabled. This voltage is fed through resistance to the gate of the pass FETs. When Q1 collector is high (enabled), +50 Volts should appear at the quarter modules.
  • Page 195 ______________________________________________HARRIS If this is not the case, then the cause for loss of drive could be either in the module or in the transmitter cabinet. First, check for normal exciter and transmitter output levels. If the exciter drive level seems normal, try the module in a different cabinet slot that is known to have proper RF drive.

  • Page 196: Locating Failed Rf Fets

    ______________________________________________HARRIS 8.3.5 Locating Failed RF FETs 8.3.5.1 DC Resistance Test The most common symptom of a bad FET is an ISO fault (3 blinks). Using a analog or digital multimeter (or equal), measure the DC resistance from the gate to ground of each FET.

  • Page 197: Parts Replacement Proced

    ______________________________________________HARRIS Now that the correct bias current is known and the quarter module with failed FET(s) has been located, one can locate the failed FET. Move the current meter to the quarter module showing abnormally low current. Again, apply DC power only and enable the module.
  • Page 198 ______________________________________________HARRIS b. Always use electrical solder with a rosin flux. Never use plumbing solder or acid fluxes, which can cause copper to corrode. Start with clean, tinned leads, which will minimize the need for flux. If it is necessary to use additional flux, use as little as possible.

  • Page 199: Quarter Module Replacemnt

    ______________________________________________HARRIS 8.4.2 Quarter Module Replacement Figure 8-7 Quarter Module RF FED Bias Pots Platinum quarter modules can be field replaced with another quarter module FACTORY TUNED to the same channel. The gain of each quarter module is adjusted by the value of the quarter module input pad.

  • Page 200: Rf Fet Replacement

    ______________________________________________HARRIS 8.4.3 RF FET Replacement CAUTION: THE RF AMPLIFIER FETS ARE SENSITIVE TO DAMAGE FROM STATIC ELECTRICAL DISCHARGE, AND SHOULD BE HANDLED IN AN ANTI-STATIC ENVIRONMENT. A GROUNDED WORKING SURFACE, GROUNDED IRON, AND ELECTROSTATIC DISCHARGE BRACELET SHOULD BE USED. CAUTION: IN ORDER TO PROTECT THE NEW FETS FROM ACCIDENTAL DAMAGE TO OVERCURRENT, BE SURE TO TURN OFF THE BIAS (FULLY COUNTERCLOCKWISE) TO ALL FOUR FET POSITIONS ON THE QUARTER MODULE...
  • Page 201 ______________________________________________HARRIS Each gain code has a part number assigned to it. These are shown in the following table: Figure 8-8 FET Marking Code Gain Code Harris Part Number 380-0737-003 380-0737-004 380-0737-005 380-0737-006 380-0737-007 Once a failed FET is isolated, remove it from the board using the following procedure: a.
  • Page 202 ______________________________________________HARRIS To install the new FET: A. Tin the bottom of the FET leads lightly with solder. B. Use the following procedure for filling a syringe with thermal compound. 1. Required Equipment: a. A 5mL syringe b. Zinc oxide (Wakefield ) thermal compound c.
  • Page 203 ______________________________________________HARRIS 2. Procedure: a. Make sure you are ESD safe through the entire procedure. b. Take the FET to be installed and make sure the back side is clean. Make sure that the heat sink mounting surface is clean as well. If the surfaces are not clean, clean them with a Q-tip dipped in cleaning solvent.

  • Page 204: Pass Fet Replacement

    ______________________________________________HARRIS j. Check to see that all bias pots of the quarter module have been turned fully counter-clockwise before applying any power. Refer to the section on Idle Current Testing to set bias controls WARNING: RF TRANSISTORS, ISOLATION RESISTORS, AND INPUT ATTENUATORS CONTAIN BERYLLIUM OXIDE (BEO) CERAMIC, A HAZARDOUS MATERIAL.

  • Page 205: Chip Cap Replacement

    ______________________________________________HARRIS 8.4.6 Chip Cap Replacement It is a common technique to use two irons with small tips (one on each side) when removing or installing chip caps. Both sides of the chip cap should be heated simultaneously to avoid residual stresses which might later cause a failure. Note that the capacitor values listed in the Parts List are typical values.

  • Page 206: Over/Under Voltage Check

    ______________________________________________HARRIS Red LED will extinguish. On PA modules one half of green LED will illuminate. On driver modules both halves of green LED will be on. Note the current reading of the quarter module, the current should be four times the nominal value or the four times the value marked on the FET hold down clamping bar.

  • Page 207: Application Of Drive

    ______________________________________________HARRIS Testing of drivers may be done in a PA slot if the drive cable access loop on the extender is removed and a external source of RF is applied (i.e. the standby exciter in dual configurations). NOTE: IF YOU ATTEMPT TO OPERATE A PA IN A DRIVER SLOT, THE DRIVE LEVEL WILL BE INSUFFICIENT TO COMPLETE THE TESTS.

  • Page 208: Iso Volts Check

    ______________________________________________HARRIS INPUT/POWER DIVIDER PWA: In Driver modules the pad is constructed using three resistors. The resistors are selected using Table A-2, (817-2100-639) Input Attenuator/Driver. 8.5.2.3 ISO Volts Check Adjust PA power to 250 Watts. For a high band driver use 150 Watts aural and for a low band driver use 65 Watts.
  • Page 209 ______________________________________________HARRIS The Red LED display has a few seconds time delay before indicating. It may be helpful to observe the power meter or quarter module current which will react instantaneously, while setting the overdrive trip point. Check the setting by reducing the power, enable the module, and increase power. The drive power level must trip within the allowed tolerance.

  • Page 210: Vswr Protection Check

    ______________________________________________HARRIS 8.5.2.5 VSWR Protection Check • Precise Method: Connect a 50 ohm termination to the module RF input. Connect a signal STEP 1: generator, test amplifier, and power meter to the module output per Figure A-7. Figure 8-9 VSWR Protection Test Setup Apply 50 V DC and enable the module.
  • Page 211 ______________________________________________HARRIS Table 8-1 Input Attenuator/Driver 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...
  • Page 212 ______________________________________________HARRIS Table 8-2 30 Watt Attenuators 888-9058-001 WARNING: Disconnect and lockout AC primary power prior to servicing...

  • Page 213: Volt Supply

    ______________________________________________HARRIS Section 9 50 Volt Supply 9.1 Introduction The RF Driver and Power Amplifier modules operate on this 50 volt power supply. There are three versions of the power supplies for different AC line voltages. • 736-0296-000 for 208/240 volts AC 60 Hz •...

  • Page 214: Six Phase Scr Rectification

    ______________________________________________HARRIS 9.2.2 Six Phase SCR Rectification The T1 WYE secondary voltages are applied to the six SCR full wave bridge mounted on a fan cooled heatsink, the SCRs come in pairs called power blocks. Wires from the SCRs are connected to a PC board containing a RC snubber network. The snubber protects the SCR from noise and line transients.

  • Page 215: Controller Power Supply

    ______________________________________________HARRIS 9.2.4.1 Controller Power Supply The rectified V+ flows through steering diode CR58 to filter capacitor C22. D6, a three terminal reference diode develops a 6.06 reference voltage, REF#2, that can be monitored at TP2. These circuits are active whenever AC power is present. When AC power is first applied to the supply, the V+ biases FET Q7 on, the bias voltage clamped by steering diode CR30 to REF#2.

  • Page 216: Fault Protection Circuits

    ______________________________________________HARRIS 9.2.4.3 Fault Protection Circuits a. Over-voltage Protection: A sample of the output voltage of the supply is compared with REF#2 by U8-C. If the output voltage exceeds 57 volts, the opamp and Q21 turn on SCR U40. This turns on the over-voltage indicator LED, DS1. The current flowing through CR32 and CR55 will shut off the 24 volt regulator, turning off the supply.

  • Page 217: Troubleshooting And Maint

    ______________________________________________HARRIS 9.3 Troubleshooting and Maintenance When a supply is in a fault condition it is important that the PA cabinet extrusion cover in front of the supply be removed and the 3 LEDs on the front edge of the supply control card be checked for fault status.

  • Page 218: Over-Temp Fault

    ______________________________________________HARRIS 9.3.0.1 Over-temp Fault Over-temperature Fault occurs when the heat sink temperature exceeds 100 degrees centigrade, closing the temperature fault switch. The normal cause of this fault is failure of the heat sink cooling fan. The front cover may be removed to improve air flow, if room temperatures are cooler, the flow of cooling air from the back door fan may keep the heatsink at a temperature below the fault point.

  • Page 219: Over-Voltage

    ______________________________________________HARRIS 9.3.0.2 Over-voltage Fault troubleshooting is started by replacing the power supply control card. Check the wire number 19 from the board socket J2 to the L2 choke output. A common problem is a D connector pin that did not latch during assembly and the pin works back out of the connector shell.

  • Page 220: Delay Angle Balance Adjust

    9.3.0.7 Vendor Repair Control boards and supplies can be returned for repair, Harris will make arrangements with the vendor for repair, Harris will need to set up a return authorization before a power supply can be shipped to the vendor.

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