Harris Platinum HT EL 2000LS, Platinum HT EL 2000HS Technical Manual

TECHNICAL

MANUAL

HT EL2000LS/HS

994 9383 001 - HT EL2000LS

994 9384 001 - HT EL2000HS

TECHNICAL MANUAL

HT EL2000LS/HS
994 9383 001 - HT EL2000LS
994 9384 001 - HT EL2000HS

888-2457-001

I Installation
II Operation
III Theory of Operation
IV Maintenance & Alignments
V Troubleshooting
VI Parts List

Transmitter
PA Amplifier Modules

VII RF Amplifier Modules

T.M. No. 888-2457-001

© Copyright 1999, 2002, 2003

Harris Corporation
All rights reserved

Rev. B: 7-25-02

Rev. B1: 6-02-03

Returns And Exchanges

Damaged or undamaged equipment should not be returned unless written approval and a
Return Authorization is r eceived from HARRIS CORPORATION, Broadcast Systems Divi­sion. Special shipping instructions and coding will be provided to as sure proper handling.
Complete details regarding circumstances and reasons for return are to be included in the
request for return. Custom equipment or special order equipment is not returnable. In those
instances where return or exchange of equipment is at the request of the customer, or
convenience o f the customer, a restocking fee will be charged. All returns will be sent
freight prepaid and properly insured by the customer. When communicating with HARRIS
CORPORATION, Broadcast Systems Division, specify the HARRIS Order N umber or In­voice Number.

Unpacking

Carefully unpack the equipment and preform a visual inspection to determine that no appar­ent damage was incurred during shipment. Retain the shipping materials until it has been
determined that all received equipment is not damaged. Locate and retain all PACKING
CHECK LISTs. Use the PACKING CHECK LIST to help locate and identify any components
or assemblies which are removed for shipping and must be reinstalled. Also remove any
shipping supports, straps, and packing materials prior to initial turn on.

Technical Assistance

HARRIS Technical and Troubleshooting assistance is available from HARRIS Field Service
during normal business hours (8:00 AM - 5:00 PM Central Time). Emergency service is
available 24 hours a day. Telephone [phone] to contact the Field Service Department
or address correspondence to Field Service Department, HARRIS CORPORATION, Broad­cast Systems Division, P.O. Box 4290, Quincy, Illinois 62305-4290, USA. Technical Support
by e-mail: [e-mail]. The HARRIS factory may also be contacted through a FAX
facility (217/221-7096).

Replaceable Parts Service

Replacement parts are available 24 hours a day, seven days a week from the HARRIS
Service Parts Department. Telephone [phone] 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. #C001 = used with C001).

MANUAL REVISION HISTORY

888-2457-001
Rev. Date ECN Pages Changed
001-B 7/25/02 48420 Replaced Title Page, iv, and 4-6

Added MRH-1/MRH-2

WARNING: Disconnect primary power prior to servicing.

888-2457-001 MRH-1/MRH-1

This page left blank intentionally

Guide to Using Harris Parts List Information

The Harris Replaceable Parts List Index portrays a tree structure with the major items being leftmost in the index.
The example below shows the Transmitter as the highest item in the tree structure. If you were to look at the bill of
materials table for the Transmitter you would find the Control Cabinet, the PA Cabinet, and the Output Cabinet. In
the Replaceable Parts List Index the Control Cabinet, PA Cabinet, and Output Ca binet show up one indentation level
below the Transmitter and implies that they are used in the Transmitter. The Controller Board is indented one level
below the Control Cabinet so it will show up in the bill of material for the Control Cabinet. The tree structure of this
same index is shown to the right of the table and shows indentation level versus tree structure level.

Example of Replaceable Parts List Index and equivalent tree structure:

The part number of the item is shown to the right of the description as is the page in the manual where the bill for
that part number starts.

Inside the actual tables, four main headings are used:

Table #-#. ITEM NAME - HARRIS PART NUMBER - this line gives the information that corresponds to the
Replaceable Parts List Index entry;

HARRIS P/N column gives the ten digit Harris part number (usually in ascending order);
DESCRIPTION column gives a 25 character or less description of the part number;
REF. SYMBOLS/EXPLANATIONS column 1) gives the reference designators for the item (i.e., C001, R102,

etc.) that corresponds to the number found in the schematics (C001 in a bill of material is equivalent to C1 on the
schematic) or 2) gives added information or further explanation (i.e., “Used for 208V operation only,” or “Used
for HT 10LS only,” etc.).

Inside the individual tables some standard conventions are used:

A # symbol in front of a component such as #C001 under the REF. SYMBOLS/EXPLANATIONS column means
that this item is used on or with C001 and is not the actual part number for C001.

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.

The first three digits of the ten digit part number tell which family the part number belongs to - for example, all
electrolytic (can) capacitors will be in the same family

(524 xxxx 000). If an electrolytic (can) capacitor is found
to have a 9xx xxxx xxx part number (a number outside of the normal family of numbers), it has probably been
modified in some manner at the Harris factory and will therefore show up farther down into the individual parts
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. This is often the case for components that may
be frequency determinant or voltage determinant and are called out in a higher level bill structure that is more
customer dependent than the bill at a lower level.

2-02-93

WARNING

THE CURRENTS AND VOLTAGES IN THIS EQUIPMENT ARE DANGEROUS. PER­SONNEL MUST AT ALL TIMES OBSERVE SAFETY WARNINGS, INSTRUCTIONS
AND REGULATIONS.

This manual is intended as a general guide for trained and qualified personnel who are aware of the dangers inherent in
handling potentially hazardous electrical/electronic circuits. It is not intended to contain a complete statement of all safety
precautions which should be observed by personnel in using this or other electronic equipment.

The installation, operation, maintenance and service of this equipment involves risks both to personnel and equipment, and
must be performed only by qualified personnel exercising due care. 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.
The following National Fire Protection Association (NFPA) standards are recommended as reference:

- Automatic Fire Detectors, No. 72E

- Installation, Maintenance, and Use of Portable Fire Extinguishers, No. 10

- Halogenated Fire Extinguishing Agent Systems, No. 12A

WARNING

ALWAYS DISCONNECT POWER BEFORE OPENING COVERS, DOORS, ENCLO­SURES, GATES, PANELS OR SHIELDS. ALWAYS USE GROUNDING STICKS AND
SHORT OUT HIGH VOLTAGE POINTS BEFORE SERVICING. NEVER MAKE IN­TERNAL ADJUSTMENTS, PERFORM MAINTENANCE OR SERVICE WHEN ALONE
OR WHEN FATIGUED.

Do not remove, short-circuit or tamper with interlock switches on access covers, doors, enclosures, gates, panels or shields.
Keep away from live circuits, know your equipment and don’t take chances.

WARNING

IN CASE OF EMERGENCY ENSURE THAT POWER HAS BEEN DISCONNECTED.

WARNING

IF OIL FILLED OR ELECTROLYTIC CAPACITORS ARE UTILIZED IN YOUR
EQUIPMENT, AND IF A LEAK OR BULGE IS APPARENT ON THE CAPACITOR
CASE WHEN THE UNIT IS OPENED FOR SERVICE OR MAINTENANCE, ALLOW
THE UNIT TO COOL DOWN BEFORE ATTEMPTING TO REMOVE THE DEFEC­TIVE CAPACITOR. DO NOT ATTEMPT TO SERVICE A DEFECTIVE CAPACITOR
WHILE IT IS HOT DUE TO THE POSSIBILITY OF A CASE RUPTURE AND SUB­SEQUENT INJURY.

i

ii

FIRST-AID

Personnel engaged in the installation, operation, maintenance or servicing of this equipment are urged to become familiar
with first-aid theory and practices. The following information is not intended to be complete first-aid procedures, it is a
brief and is only to be used as a reference. It is the duty of all personnel using the equipment to be prepared to give
adequate Emergency First Aid and thereby prevent avoidable loss of life.

Treatment of Electrical Burns

1. Extensive burned and broken skin
a. Cover area with clean sheet or cloth. (Cleanest available cloth article.)

b. Do not break blisters, remove tissue, remove adhered particles of clothing, or apply any salve or ointment.

c. Treat victim for shock as required.

d. Arrange transportation to a hospital as quickly as possible.

e. If arms or legs are affected keep them elevated.

NOTE

If medical help will not be available within an hour and the victim is
conscious and not vomiting, give him a weak solution of salt and soda:
1 level teaspoonful of salt and 1/2 level teaspoonful of baking soda to
each quart of water (neither hot or cold). Allow victim to sip slowly
about 4 ounces (a half of glass) over a period of 15 minutes. Discon­tinue fluid if vomiting occurs. (Do not give alcohol.)

REFERENCE:

2. Less severe burns - (1st & 2nd degree)
a. Apply cool (not ice cold) compresses using the cleanest available cloth article.

b. Do not break blisters, remove tissue, remove adhered particles of clothing, or apply salve or ointment.

c. Apply clean dry dressing if necessary.

d. Treat victim for shock as required.

e. Arrange transportation to a hospital as quickly as possible.

f. If arms or legs are affected keep them elevated.

ILLINOIS HEART ASSOCIATION

AMERICAN RED CROSS STANDARD FIRST AID AND PERSONAL SAFETY MANUAL (SEC­OND EDITION)

iii

Table Of Contents

Section I

Introduction/Specifications

Introduction......................................1-1

GeneralDescription .............................1-1

ControlandMonitoring ............................1-1

Signal Flow Through the System..................... 1-1

RFAmplifierModules............................. 1-1

PowerSupplies...................................1-1

Cooling .........................................1-1

RFOutputSystem.................................1-1

OptionalEquipment ...............................1-1

BlockDiagram ...................................1-1

Specifications ....................................1-1

Section II

Installation

Introduction......................................2-1

TestEquipmentRequirementPlanning.............. 2-1

MechanicalInstallationPlanning.....................2-1

SpaceRequirements............................. 2-1

ApproximateShippingWeights....................2-1

RFSystemLayout ..............................2-1

AirSystem.....................................2-1

ElectricalInstallationPlanning.......................2-1

PowerRequirements.............................2-1

CircuitBreakerSelection.........................2-1

ACmainsDisconnectLocation....................2-2

UnloadingandUnpacking..........................2-2

EquipmentRequiredforUnloading.................2-2

Unpacking,EquipmentInventoryandInspection......2-2

FactoryTestDataSheets .........................2-3

CabinetPlacementandLeveling................... 2-3

ElectricalInstallation ..............................2-4

Grounding .....................................2-4

PrimaryWiring................................. 2-4

SettingTransformersTaps........................2-5

Input Signals ...................................2-5

SetupJumpers..................................2-5

BackupBattery.................................2-5

RFOutputCoaxConnections...................... 2-5

Interlocks......................................2-5

TransmitterCheckOut............................. 2-5

Pre-turnonchecks .............................. 2-5

InitialTurn-onSequence .........................2-5

Module Installation..............................2-5

ControlSystemCheckOut........................2-6

InitialApplicationofRFPower....................2-6

Visual.....................................2-6

Aural .........................................2-6

RemoteControlInputandOutput.................... 2-6

CommandIn1A12J21 ...........................2-6

1A12J22:StatusOutputs .........................2-6

StatusFunctions1A12J22 ........................2-7

AnalogOutputs1A12J23......................... 2-7

Section III

Operation

Introduction......................................3-1

ControlsAndIndicators............................ 3-1

LocalTurn-onandTurn-off ........................ 3-1

VideoControlledOperation ........................ 3-1

RemoteControl/ExtendedOperation................. 3-1

Section IV

Theory of Operation

Introduction ..................................... 4-1

SystemOverview................................. 4-1

Exciter,MeterandControlBoard.................... 4-1

A/D&Displays................................ 4-1

BarGraphDisplay.............................. 4-1

AnalogMultiplexers ............................ 4-1

MeterSelector................................. 4-1

LossOfVideoDelayDetector.................... 4-2

Override/NormalSelection....................... 4-2

ClockCircuits ................................. 4-2

BATTERY (BAT) SUPPLY VOLTAGE............ 4-2

VisualPowerControl ........................... 4-2

AuralPowerControl............................ 4-2

PowerUpReset................................ 4-2

JP2&JP3..................................... 4-2

FREQUNLOCK............................... 4-2

VIS_CLK_GATE U18 & AUR_CLK_GATE U19

FunctionalDescriptions......................... 4-3

METER_CLK_GATE U20 Functional De-

scriptions................................. 4-3

METER_SEL U17 Functional Descriptions.......... 4-3

VIS_UP/DWN_PWR_CTRLU26&U27....... 4-3

VisualDACU25............................... 4-3

VisualFoldbackControl......................... 4-3

AUR_UP/DWN_PWR_CTRLU29&U30.......... 4-3

InterfaceLogicModule............................ 4-4

PeakDetectors................................. 4-4

FoldbackCircuits............................... 4-4

HighVSWR................................... 4-5

Command Input Logic PAL U8 (917-2321-004)...... 4-5

XMTRCTRLPALU15 ..................... 4-5

Fault Encoder U19 (917-2321-008) ............ 4-5

50VOK .................................. 4-5

AirFault.................................. 4-6

ACBREAKERS ................................. 4-6

MAINBREAKER.............................. 4-6

ACCONTROLBREAKER...................... 4-6

LOGICSUPPLYBREAKER..................... 4-6

POWER MODULE 1A11 .......................... 4-6

POWER SUPPLY FAULT DISPLAY and INTER-

FACE1A11A6................................ 4-6

50VSUPPLIES1A11A1and1A11A5 ............. 4-7

LOGICSUPPLY1A11A3 ....................... 4-7

Section V

Maintenance and Alignments

Introduction ..................................... 5-1

StationRecords .................................. 5-1

Transmitter Logbook ............................ 5-1

MaintenanceLogbook........................... 5-1

SafetyPrecautions.............................. 5-1

PreventiveMaintenance ........................... 5-1

AirFilterMaintenance .......................... 5-1

iv 888-2457-001 Rev. B: 7/25/02

WARN9ING: Disconnect primary power prior to servicing.

MOV’S....................................... 5-2

Semiconductors................................ 5-2

Capacitors................................. 5-2

FixedResistors............................. 5-2

Transformers .............................. 5-2

Relays.................................... 5-2

PerformanceChecks.............................. 5-2

Adjustments..................................... 5-2

RFPowerMeasurements .......................... 5-2

Through-LineMeters............................ 5-2

Visual Peak-sync to Average Power Conversion For-

mulas........................................ 5-3

TransmitterMeteringandControlCalibration.......... 5-3

Power Supply Meter Calibration................... 5-3

PSVOLTSCalibration:...................... 5-3

PSCURRENTCalibration ................... 5-3

ExciterRFOutputMeterCalibration............... 5-3

ExciterVisualPowerCalibration.............. 5-3

ExciterAuralPowerCalibration............... 5-3

TransmitterRFOutputMeterCalibration ........... 5-3

Transmitter Visual Forward Power Calibra-

tion...................................... 5-4

Transmitter Visual Reflected Power Calibra-

tion...................................... 5-4

TransmitterAuralForwardPowerCalibration.... 5-4

Transmitter Aural Reflected Power Calibra-

tion...................................... 5-4

VSWRFaultAndFoldbackAdjustments ........... 5-4

InitialSetupforAdjustment .................. 5-4

VisualHighVSWRAdjustment............... 5-4

VisualVSWRFoldbackAdjustment ........... 5-4

AURALHIGHVSWRAdjustment............ 5-4

AuralVSWRFoldbackAdjustment............ 5-4

TransmitterAGCAdjustment....................... 5-4

VisualAGC: .................................. 5-4

VisualPowerReduction......................... 5-5

AuralAGC.................................... 5-5

AuralPowerReduction.......................... 5-5

Component Replacement On Circuit Boards ........... 5-5

Section VI

Troubleshooting

Introduction..................................... 6-1

Troubleshooting Assistance......................... 6-1

Returns......................................... 6-1

Section VII

Parts List

Section VIII

Parts List

Appendix A

RF Amplifier M odules, Platinum Series

GeneralInformation .............................. A-1

Factory Module Repair .......................... A-1

LocalModuleRepair............................ A-1

RFAmplifierModulesTheoryofOperation........... A-1

Driver Module, Low Band........................A-2

Driver Module, High Band .......................A-2

PAModule....................................A-4

RF Quarter Modules.............................A-4

Low Band Quarter Module .......................A-4

HighBandQuarterModule.......................A-5

Quarter Module Bias ............................A-5

Protection,ControlandMonitorSubsystem..........A-5

Module Status LEDs ............................A-6

RedLEDFaultBlinkCodes ..................A-6

Module Troubleshooting ...........................A-6

Platinum™ TV Module Test Fixture (992-8556-002) . . A-7

Troubleshooting Based on Module Swapping ........A-7

Troubleshooting Based on Module Blink Codes ......A-7

IsolatingOtherFailures.........................A-10

LocatingFailedRFFETs........................A-11

DCResistanceTest.........................A-11

IdleCurrentTest...........................A-11

PartsReplacementProcedures......................A-12

SolderingPrecautions...........................A-12

Quarter Module Replacement ....................A-13

RFFETReplacement...........................A-13

TestingandReplacingIsolationResistors ..........A-14

PassFETReplacement..........................A-14

ChipCapReplacement .........................A-15

TestProcedureSolidStateTVModules..............A-15

Pre-operationalChecks .........................A-15

InitialPowerUp...........................A-15

IdleCurrentCheck.........................A-15

Over/UnderVoltageCheck..................A-15

RFTesting ...................................A-15

ApplicationofDrive........................A-15

GainCheck...............................A-15

Alternate method for measurement under

program conditions......................A-16

ISOVoltsCheck...........................A-16

OverdriveCheck...........................A-16

VSWRCheck.............................A-16

Appendix B

Air Conditioning Considerations

Air Conditioning ................................. B-1

HeatLoadEstimateGuide.......................... B-1

Appendix C

Surge and Lightning Protection and Grounding Consid-

erations

SurgeandLightningProtection...................... C-1

System Grounding ................................ C-1

Ground Wires .................................. C-1

ACGround....................................C-1

DCGround....................................C-2

Earth Ground ..................................C-2

RF Ground .................................... C-2

Rev. B: 7/25/02 888-2457-001 v

WARN9ING: Disconnect primary power prior to servicing.

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Section I

Introduction/Specifications

1.1 Introduction

1.1.1 General Description

Platinum™ Series The HT EL 2000 watt television transmitter
is an externally diplexed transmitter available in CCIR systems
forM,D/K,B,I,andK.

The transmitter consistsof5 RFamplifier modules, coolingfans,
50 volt power supplies,controlinterface tray,logicpower supply
and an exciter. The exciter includes thetransmitter controlpanel.
Transmitters operate on a 208-240 volt single phase 50 or 60
Hertz. The transmitter assemblies all are mounted in a single
cabinet 183 cm (72 inches) high.

1.2 Control and Monitoring

Transmitters are designed for local, video present control, or
remote/extended operation. VSWR foldback is used to protect
the transmitter RF system. Over temperature protection of RF
modules and module power supplies is standard.

1.3 Signal Flow Through the System

Refer to transmitter block diagram Figure 1-1.
The visual exciter uses IF modulation with pre-correction at

video and IF. The visual signal is amplified by a driverand three
PA modules.

The aural exciter modulates audio baseband and subcarrier in­puts at aural IF carrier . Optional IF group delay correction is
available for a Notch Diplexer and aural linearization for dual
carrier systems. The aural signal is amplified by a RF driver
amplifier module.

1.6 Cooling

The main coolingair intake isthrough the reardoor and exhausts
out the top and right side. There are fivesupply and five exhaust
fans for module cooling. T wo other fans are used for heat pipe
cooling.

Removing one module will not affect air flow to other modules.
Each power supply has a fan to draw air from the front of the

transmitter.

1.7 RF Output System

Various diplexing systems are used as the system requires. Har­monic and imagefrequency color subcarrierfiltersare part ofthe
system.

1.8 Optional Equipment

Single or dual cavity Notch Diplexer
Multichannelsound:NICAM, IRTDual Carrierand BTSC
Precision Offset
Combined transmitters
Main/alternate transmitters
Second exciter with automatic exciter switcher
Power measurement wattmeter
RF module test fixture
Spare parts, semiconductors and board assemblies
Spare RF modules
Transmitter Remote Control System

1.9 Block Diagram

Figure 1-1 is a block diagram of the HT EL2000LS/HS.

1.4 RF Amplifier Modules

Like aural and visual modules are interchangeable and have
overdrive, over/undervoltage, power unbalance, VSWR, and
overtemperature protection. The modules may be repaired in the
field at the quarter module or component level.

1.5 Power Supplies

The exciter and interface logic utilize linear regulator supplies.
The RF module power comes from power factor corrected
switching supplies in the power module assembly.

WARNING: Disconnect primary power prior to servicing.

1.10 Specifications

Table 1-1 lists the specificaitons for the HT EL2000LS/HS.

NOTE

Specifications subject to change without notice.

888-2457-001 1-1

Platinum™ Series

Figure 1-1. HT EL2000 LS/HS Block Diagram

1-2 888-2457-001

WARNING: Disconnect primary power prior to servicing.

Table 1-1. Specifications

Section I - Introduction/Specifications

WARNING: Disconnect primary power prior to servicing.

888-2457-001 1-3

Platinum™ Series

Table 1-1. Specifications

Electrical Specifications HT EL2000LS/HS
V isual Specifications:
Power Output 2 kW Peak of sync

Measured at output of optional diplexer

Frequency Range HT EL2000LS, 47-88 MHz

HT EL2000HS, 170-230 MHz
Systems CCIR-M,N,B,D/K,K1,I
Color Formats NTSC, PAL, SECAM
RF Output:
Impedance 50 ohms.
Connector 1 5/8" EIA unflanged
Video Input:
Impedance 75 Ohm, 32 dB return loss up to 5.0 MHz
Level 0.5 - 2.0 Volts, peak to peak
Visual Modulation Capability 0%

Measured using synchronous detector.
Frequency Response vs. Brightness 0.75 dB or better

Measured using a 20% amplitude swept video modulation with pedestal set at

10%, 50% and 90% APL. All percentages relative to a blanking to white

excursion.
Differential Gain 3% or better

Measured with a 5-step staircase signal 0 to 100 IRE units and color subcarrier

of 20 IRE units peak to peak.
Differential Phase 1 or better

Measured with 5-step staircase signal as in Differential Gain.
Incidental Carrier Phase Modulation 1.5 or better

Carrier phase variation from reference white to sync tip relative to blanking.
Luminance Non-linearity 1.0 dB or better

Measured with a 5-step staircase signal. Test Signal #3 CCIR Rec. 421-3.
Equivalent Envelope Delay Compliant with CCIR system
2T Pulse K-Factor 1.5% Maximum
20T Pulse 3% Maximum baseline disturbance
Signal-to-Noise -55 dB RMS or better

Total random and periodic noise unweighted, relative to peak sync.
Variation of Output 2% or less

Total peak-to-peak variation of peak sync voltage during one field, using a field

square wave test signal.
Regulation of Output Power 3% or less

Variation of peak output power with a change in average picture level from

black to white (0% to 100%).
Carrier Frequency Stability 150 Hz per month

After 60 day initial aging.

(2 Hz, with optional precise frequency control)
Harmonic Radiation -70 dB RMS, relative to peak vision power.
Aural Specifications:

1-4 888-2457-001

WARNING: Disconnect primary power prior to servicing.

Table 1-1. Specifications

Continued

Power Output 200 W

Measured at output of optional notch diplexer.
RF Output:
Impedance 50 Ohms
Connector Type N, Female
Audio Inputs:

1. Monaural
Level 0 to +16 dBm, 25 kHz deviation
Impedance 600 Ohms balanced
Response 0.5 dB, 30 Hz-15 kHz
Pre-emphasis Flat / 50uS / 75uS, selectable

2. Subcarrier (2 inputs)
Level 1 volt RMS, adjustable.
Impedance 75 Ohms, unbalanced
Response 0.5 dB, 20 kHz-110 kHz.

3. Wideband(composite)
Level 1 volt RMS nominal for 75 kHz deviation
Impedance 75 Ohms, unbalanced
Response 0.1 dB, 50 Hz to 50 kHz

0.5 dB, 50 kHz to 110 kHz
Monaural Performance:
Frequency Response 0.5 dB, 30 Hz to 15 kHz

Relative to standard 75S or 50S pre-emphasis curve.

Harmonic Distortion 0.2% or less

Measured at 25 kHz deviation, 30 Hz to 15 kHz after de-emphasis.

FM Signal-to-Noise 60 dB RMS or better

Relative to 25 kHz deviation.

AM Signal-to-Noise 55 dB RMS or better

Relative to 100% amplitude modulation.

AM Synchronous Noise 40 dB RMS or better

Relative to 100% amplitude modulation, measured before optional diplexer.
Wideband Composite Performance: (At 75kHz deviation)
Harmonic Distortion 0.25% or less, 50 Hz to 15 kHz

0.75% or less, 15 kHz to 50 kHz

Distortion (IMD) 0.5% or less

SMPTE 4:1 test signal.
FM Signal-to-Noise 70 dB RMS or better

Measured after de-emphasis.
AM Signal-to-Noise 55 dB RMS or better

Relative to 100% amplitude modulation.
AM Synchronous Noise 40 dB RMS or better

Relative to 100% amplitude modulation.
Stereo Separation 45 dB or better ,50 Hz to 15 kHz

Equivalent mode (uncompanded).
Crosstalk 50 dB or better

Stereo or Main channel into SAP.
Mechanical, Environment, Power
Physical Dimensions:

Section I - Introduction/Specifications

WARNING: Disconnect primary power prior to servicing.

888-2457-001 1-5

Platinum™ Series

Table 1-1. Specifications

Continued

Width 26" (66 cm)
Height 72" (183 cm)
Depth 35" (89 cm)
Weight 800 lbs (363 kg)
Environmental Requirements:
Operating Temp. Range 0 to +45 degrees C

(+32 to +113 degrees F)
Maximum temperature rating decreases 2 degrees C per 1,000 foot altitude

above mean sea level.
Humidity Range 0 to 95% Relative Humidity
Maximum Altitude 10,000 feet (2,286 meters)
Power Requirements:
Input 208/240 volts 11 volts, single phase, 50/60 Hz
Regulation 10%
Air System Requirements:
Inlet Air Openings Rear door and front power module, with filters
Exhaust Air Openings Amplifier cabinet top, 30" x 8" and amplifier cabinet right rear side (two areas),

6" x 18" and 9" x 11".
Exhaust Temperature 10 degrees C temperature rise above inlet
Allowable Back Pressure 0.05" of water at each cabinet exhaust stack
Acoustic Noise 65dB, @ 3 feet in front of center of transmitter (“A” weighting scale)
Inlet/Exhaust Air Flow 1225 cfm

1-6 888-2457-001

WARNING: Disconnect primary power prior to servicing.

2.1 Introduction

This section contains information necessary for installation
planning, installation, and initial checkout procedures on Plati-
num™ Series HT EL2000LS/HS television transmitters. The
informationinthissectionisintendedtobeusedonlyasa
general guideline in planning the installation. Since all installa­tions differ in some respects, and in order to conform to local
building and electrical codes,the informationcontained mustbe
adapted for each installation.

2.1.1

Test Equipment Requirement Planning

See Table 2-1 for a list of recommended test equipment.

2.2 Mechanical Installation Planning

2.2.1 Space Requirements

(Refer to Transmitter Outline drawing: 843-5285-110)
Planning for the transmitter room should allow space for pro-

gram input, monitoring, remote control, and test equipment as
well as the transmitter. Additional area may also be required for
tower lighting, HVAC (heating, ventilation and air-condition­ing) equipment, storage, and a workbench. To allow for servic­ing the transmitter, a minimum clearance of 3 feet (92 cm) in
front of and 20 inches (51 cm.) behind the cabinet is recom­mended.

The Transmitter Outline drawing, shows the air exhaust hole
pattern locations, do notobstruct these exhaustareas.Leaveside
exhaust areas unobstructed for at least 8 inches (20 cm.).

2.2.2

Approximate Shipping Weights

(lb) (kg)
Cabinet 435 198
Exciter 55 25
RF modules each 26 12
Power module 125 57

Be sure to include this information in your planning for the
building and verify that the structure is capable of safely sup­porting the total weight of the transmitter and peripheral equip­ment.

2.2.3

RF System Layout

The 1 5/8 EIA unflanged visual RF output and the N connector
aural output areon the top of thecabinet. Adapters arefurnished
where needed to connect RF coax cables to 1 5/8 EIA compo­nents. The outline drawings of typical RF notch diplexers and
harmonic filters are included. Use the block diagrams and
component outline drawings (Fig 2-2 through 2-11) to plan the
installation for the site requirements. Locate the transmitter
close to thediplexerto minimize theinterconnectionline losses.
A support system should beinstalled sothat the RF components
are completely supported,to minimizethe weight carried by the

Section II

Installation

output connectors. This will prevent possible damage to com­ponents and connectors. Notch diplexersare generally supplied
in a frame which rests on or is bolted to the floor.

Directional couplers for metering are in the transmitter cabinet.
Optional directional couplers for monitoring are on the block
diagram and should be ordered with the transmitter. Be sure all
components necessary for installation are available on site.

2.2.4

Air System

Minimum transmitter air cooling requirements are 1200 cubic
feet per minute (34 cubic meters per minute). Additional flush­ing air is recommended for the removal of heat from any
equipment surrounding the transmitter. A good guideline is to
keepinputair no greater than 5°C above ambient. The maximum
transmitter operating temperature is 45°Catsealevel(derate
2°C for each 1000 feet (300 meters) above sea level. Hot air
rises, one approach would be to use exhaust duct(s) or louvers
at the highest point of the room and use a supply fan and filter
frame to keep the room at a positive pressure.

Appendix B contains information useful to those intending to
use air conditioning equipment to control transmitter building
temperature.

2.3 Electrical Installation Planning

Each country establishes standards for AC power systems. The
national and localapplicable standard for the installationshould
be followed.

See Appendix C for information about lightning and surge
protection.

2.3.1

Power Requirements

The transmitter is designed to operate from 208 to 240 volts,50
or 60 Hz, single phase. If voltage variations in excess of
areanticipated, it isrecommended that thetransmitter ACmains
be equipped with automatic voltage regulators capable of cor­recting the primary voltage.

All control wiring and signal inputs are located at the I/O panel
in the cabinet. Additional access is provided in the cabinet floor
for AC wiring only. AC power to the transmitter should be run
in metallic conduit, connected to earth ground for safety and to
provide shielding against interference. The power wiring must
be terminated in a power distribution panel,this panelmust also
beconnected to earth ground.Atransmitter cabinet ground strap
connection is located at the lower rear edge.

2.3.2

Circuit Breaker Selection

The transmitter requires a relatively stable source of input
power. For this reason, the primary power for the transmitter
should originate at the main power distribution system and
remain isolated from other electrical distributions.

+10%

WARNING: Disconnect primary power prior to servicing.

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Platinum™ Series

Table 2-1. Recommended Test Equipment

Ve stigial Sideband Demodulator Tektronix 1450/1350 or
Equivalent

Option 1 37 MHz IF, NTSC CCIR-M (USA and others)
Option 2 38.9 MHz IF, CCIR-G, PAL
Tektronix Sideband Analyzer
Consisting of:
1405 Sideband Adaptor
2710, 490, or 2750 Spectrum Analyzer
Tektronix 1910 Signal Generator or equivalent
Tektronix 1780 Video Measurement Set
Aural Stereo Generator, Orban 8182A or equivalent
Aural Demodulator Tektronix 751, TFT-850,or equivalent for

stereo
Time & Frequency Technology 701, 702, or equivalent for

monaural
A method of measuring transmitter frequency with two

sources. (Frequency Counter, Frequency Counter on De­modulator, Outside Frequency Measuring Service.)

Audio Oscillatorand Distortion Analyzer (Sound Technology
1710A or equivalent).

Asaca 201-1 Envelope Delay Measuring Set
Scope Camera
RF Bridge, Ealge RLB-150, or precision directional coupler

700-1289-000
UHF RF Notch Filter, Eagle Model TNF-1 484-0300-000
Various RF Adaptors and Connectors
3-1/8 inch to type “N” adapter - 620-0008-000
Type N to BNC male to female - 620-0128-000
Type N to BNC female to male - 620-0547-000
Type BNC plug to Subminiax Plug
Type BNC plug to Subminiax Jack
Type BNC barrel - 620-0604-000
Type BNC to SMB (push-on) - 620-0628-000
TNC-BNC - 620-2821-000
Bird Model 43 Wattmeter with elements from 1W to 1000W
Adaptor 1 5/8" coax to N connector
Manometer Dwyer model40-1 (range 0.1-0-1.0"WC)or equal
Tee kit Dwyer A-604T or equal
Fluke Multimeter and Style C Current Probe

A short-duration surge, due to transformer inrush current, will
occur at turn-on or during a short AC power loss.This surgecan
be as high as 400 amps. During this surge,the linevoltage at the
cabinetmustnotdropbelow80%of the rated line voltage. Select
a 40 amp breaker or fuse for the transmitter using the above
inrush current information.

AC mains Disconnect Location

2.3.3

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.
Breakers must be clearly labeled. Provisions for emergency
lighting should be made.

2.4 Unloading and Unpacking

2.4.1 Equipment Required for Unloading

Examine the weights listed on the Transmitter Outline drawing
for guidance on the equipment needed. Note: The notch
diplexer, if used, will be the heaviest.

Unpacking, Equipment Inventory and Inspection

2.4.2

A“check-off”boxis availableto help the installertrackthe steps
that have been completed.

Whenthetransmitteris deliveredtothesite, the shipment should
be inspected and inventoried before installation is begun. This
section provides information to assist unpacking and inventory.

Locate the packing check list when the shipment arrives.
Each transmitter shipment will be accompanied by a packing

check list identifying which equipment is packed in the various
crates and boxes.

LOCATED PACKING CHECK LIST
The contents of the shipment should be inventoried with the
packing list. Carefully unpack the unit and perform a visual
inspection to determine if any apparent damage has been in­curred during shipment. Retain all shipping materials until ithas
been determined that all items on the list are on site and no
damageoccurred during shipment.It maybenecessaryto search
packing material for parts initially missed during unpacking.
The carrier may also wish to examine the packing material.

If the contents are incomplete, or if the unit is damaged electri­cally or mechanically, notify the Harris Customer Service De­partment by phone at 217-222-8200, FAX at 217-222-9443 or
at the following address:

Harris Corporation,

Broadcast Division

P.O. Box 4290

Quincy, Il 62305

Attn. Customer Service Department

INVENTORY OF EQUIPMENT COMPLETED
The equipment becomesthe propertyof the customer when the
unit is delivered to the carrier. Claims for damaged equipment

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WARNING: Disconnect primary power prior to servicing.

Section II - Installation

must be filed promptly; otherwise, the carrier may not accept
the claim.

2.4.3

Factory Test Data Sheets

Factory test data is supplied with each transmitter. It lists pa­rameters for operation of the transmitter. These readings were
recorded during factory testing. Locate the test data and place it
in the manual at the end of the maintenance section.

Record the same readings periodically to establish and maintain
an information base from which to work in the event of future
changes or problems.

FACTORY TEST DATA LOCATED

Cabinet Placement and Leveling

2.4.4

Four bolts hold the cabinet to its skid. They are located two per
side, front and rear. When the cabinetis inits final position, you
may need to level the cabinet. The HT EL cabinet has leveling

jacks in the corners to aid in leveling the cabinet on un-even
floors.The four 0.5inch hold-downs in thebottomofthe cabinet
used to bolt the cabinet to the shipping skid that may be used to
bolt the unit to thefloor.Levelthecabinet using shimsunder the
bottom, this is important to avoid deforming the cabinet when
bolting it to the floor.

Install the power module assembly in the bottom of the rack. It
will slide intomating electrical connectors.Install the Exciter(s)
and connect power and signal cables to exciter(s).

NOTE

DO NOT INSTALL RF MODULES AT THIS TIME

WARNING: Disconnect primary power prior to servicing.

Figure 2-1. Transformer Taps

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Platinum™ Series

2.5.2

2.5 Electrical Installation

2.5.1 Grounding

Located in the lower left rear corner of the cabinet is a ground
strap. Connect thestation groundto this strap with 2 inch(5 cm)
copper strap. For additional information on station grounding
requirements refer to Appendix C.

GROUND STRAP CONNECTED

Table 2-2. Input Signals & Remote Conrol I/O

SYMBOL FUNCTION CONNECTOR LABEL CONNECTOR TYPE
Exciter A Exciter B
J1 J11 Video Input VIDEO IN BNC
J2 J12 Aural Composite input COMP AUR BNC
J3 J13 Aural Subcarrier 1 AUR SCA 1 BNC
J4 J14 Aural Subcarrier 2 AUR SCA 2 BNC
J5 J15 Precise Frequency Control Input PFC IN BNC
J6 J16 Monaural Aural Input/Dual Sound Audio 1 MONO AUR 1 XLR
J7 J17 Monaural Aural Input/Dual Sound Audio 2 MONO AUR 2 XLR
J8 J18 NICAM Reference BNC
J9 J19 NICAM IF In BNC
J10 J20 Option Access BNC
J21 Remote Command Input 37 Pin D
J22 Remote Status Output 37 Pin D
J23 Remote Analog Output 37 Pin D

Primary Wiring

(Refer to drawing 839-7994-179.)
AC power is connected to terminal block 1A14TB1 located on

the right wall inside the rear door. Use #8 A WG wire at a
minimum or larger if required by Wiring Codes. Connect the
“hot” side of the ac line to 1A14TB1-1, the neutral side to
1A14TB1-2 and connect 1A14TB1-3 tothe safety or protective
ground wire.

PRIMARY WIRING CONNECTED

Table 2-3. Setup Jumpers - Normal Positions

1A2 Exciter Meter/Control Board
JP # POSITION FUNCTION (AS SHIPPED)
JP1 1-2 Loss of video enabled
JP2 1-2 Remote control of aural group delay
JP3 1-2 Remote control of notch diplexor
1A3 Interface Logic
JP# POSITION NORMAL FUNCTION
JP1 1-2 Visual foldback enabled
JP2 1-2 Aural foldback enabled
JP3 1-2 Aural AGC enabled
JP4 1-2 Source/Sink for Remote Status
JP5 1-2 Source/Sink for Remote Command
JP6 Factory Select Aural AGC 2dB pad select
JP7 1-2 Exciter A fault select DIGITAL
JP8 1-2 Exciter B fault select DIGITAL
JP9 1-2 Power supply 3 not present
JP10 1-2 Video control enabled
JP11 Factory Select Aural AGC 3dB pad select
JP12 1-2 Aural AGC enabled
JP13 Factory Select Visual AGC 3dB pad select
JP14 Factory Select Visual AGC 2dB pad select
JP15 1-2 NO 5 sec restart, AC FAIL
JP16 1-2 High VSWR shutdown enabled

2-4 888-2457-001

WARNING: Disconnect primary power prior to servicing.

Section II - Installation

2.5.3 Setting Transformers Taps

Check taps on the power supply in the exciter. Refer to figure
2-1, or drawing 839-7900-504. The logic supply 1A11PS1
located in the rear of the power module behind the 1A12 I/O
panel is tapped as shown in chart below

PRIMARY VOLTAGE

208-220 230-240
JUMPER CONNECTION 2 AND 3 2 AND 3
AC CONNECTION 1 AND 5 1 AND 4

TRANSFORMER PRIMARY TAPS CHECKED

Input Signals

2.5.4

The input signals and remote control I/O are located on 1A12.
See Table 2-2.

NOTE: The coax wiring for the External Precise Frequency
Control (PFC) option is installed in the cabinet. If the PFC
option is purchased the wiring will be added to the exciter.

INPUT SIGNALS CONNECTED

Setup Jumpers

2.5.5

Check the set-up jumpers, located in the exciter 1A2 and Inter­face Logic 1A3. Jumpersare normally shipped from the factory
in the positions shown in Table 2-2. They may be changed if
needed.

JUMPERS SET FOR CORRECT CONFIGURATION

Backup Battery

2.5.6

CAUTION

DO NOTUSE RECHARGEABLE BATTERIES

The battery holder will accept three size AA (NEDA 15A) 1.5
Volt batteries. These batteries furnish power to hold the trans­mitter status in the control system and control the return to
operation when AC power returns. The batteries should be
replaced as part of a regular mantenance schedule.

2.5.7

RF Output Coax Connections

(Refer to 843-5285-110)
The RF output connections, 1A15J1 for visual and 1A15J2 for

aural are located on the top of the cabinet. Make any desired
VSWR measurements of the RF plant before making final
connections to the cabinets.

2.5.8

Interlocks

External interlocks are connected to REMOTE COMMAND
1A12J21-7. A contact closure to ground mustbe present to turn
on the transmitter. If this interlock is not used, 1A12J21-7 must
be jumpered to ground.

The external contact closure or other device must sink 50
microamps to less than 0.5 volts. Open circuit voltage is +5V.

INTERLOCK WIRING INSTALLED

2.6 Transmitter Check Out

2.6.1 Pre-turn on checks

CAUTION

BEFORE PROCEEDING WITH CHECK OUT, INSPECT THE
TRANSMITTER FOR AC POWER SHORTS, LOOSE HARDWARE,
WIRINGERRORS,UNCONNECTEDWIRES, MISSING PARTS,AND
DEBRIS.

2.6.2 Initial Turn-on Sequence

The following procedures arethe sequential stepsto safely turn
on the transmitter, and must be performed in the order listed. It
is recommended that the installation personnel read the general
description in section one, the controls and operation material
in section three, and these procedures before starting.

a.

MODULESMUST NOTBEINSTALLEDAT THIS TIME

b.

Apply 1 volt p-p video to exciter video input.

c.

Theloss of video indicatorshould extinguish immediately
or after the loss of video times out depending on option
that is jumper selected.

d.

Press transmitter ON pushbutton.

e.

Openthe externalinterlock. The external interlock lampshould
be illuminated and the transmitter should shut off. Press ON
button.The transmitter shouldnot come on.Closethe interlock
circuit. The external interlock lamp should extinguish.

f.

Verify operation of RAISE and LOWER switches.

g.

If the system has a remote control, place transmitter in the
REMOTE mode and check for operation of transmitter
ON/OFF and RAISE/LOWER from the remote.

h.

Verify that LOCAL mode inhibits remote commands.

i.

Return exciter to minimum power by depressing and
holding LOWER commands for about 15 seconds.

j.

Measure the 50 voltsupply by usingthe multimeter onthe
front of the exciter. It should measure 50 volts.

k.

Press transmitter OFF pushbutton.

2.6.3

Module Installation

The modules may now be installed. Refer to factory test data for
placement ofmodules byserial number and slotnumber.There are
threetypesofmodules,DRIVERS, HIGHPOWERDRIVERS and
PA’s. The DRIVERS are keyed to be eitherstandard or high power
drivers and will not fit into a P Aslot. Use of a P Ain a driv eslot is
for emergency only. Although each type is interchangeable from
aural to visual and will work in any like socket, when starting out
it is best to reassemble them in the same locations as tested. Keep
a record of any changes for future reference.

Make sure each module is completely seated.

CAUTION

DO NOT USE EXCESSIVE FORCE INSTALLING MODULES INTO
THE SLOTS.

WARNING: Disconnect primary power prior to servicing.

888-2457-001 2-5

Platinum™ Series

2.6.4 Control System Check Out

a.

Depress andhold powerLOWER controls for 15 seconds
each to ensure that exciters are turned all the way down.

b.

Press transmitter ON pushbutton.

c.

Check that all modules are enabled. Drivers will show a
full green LED. PA modules will illuminate half of the
green LED. It is normal for the red module LEDs to come
on momentarily as the transmitter 50 volt supplies come
up to voltage at turn on. They also will come on at
shut-down,gradually fading outas the suppliesdischarge.

d.

Open back door and verify that all fans are functioning.

e.

Check MODULE FAULT status for each module. Check
to see that all modules are enabled (green LED on); press
transmitter ON to enable any modules that are not already
on.

f.

Squeeze the disable switch in the handle of the first
module. The module LEDsshould go out. You should see
the MODULE FAULT lamp on at the control panel. Re­enable the module by pressing transmitter ON at the
control panel. The MODULE FAULT lamp on the control
panel should go out. Repeat procedure for each module.

2.6.5

Initial Application of RF Power

2.6.5.1 Visual

a.

LOWER the exciter to minimum drive and apply a ramp
or staircase test signal.

b.

Press transmitter ON pushbutton.

c.

Check to see that all RF amplifier modules are enabled.

d.

Slowly raise visual power while observing VSWR and
FORWARD POWER. Stop at approximately 25% for­ward power .

e.

Switch video to black picture with no setup for power
calibration. Sync peak power multiplied by a system
dependantconstantequalsaveragepower.Some constants
are 0.568 (CCIR B) and 0.595 (CCIR M)

f.

Using an external power meter to confirm power output,
slowly increase visual power to 100% on external power
meter.

If external power meter and panel readings do not rea­sonably agree, refer to the power calibration procedures
in Section 5.

g.

Atfulloperatingpowermeasurethebelowparametersand
adjust if needed. See Section 5 for alignment procedures.

Depth of modulation
Differential gain
Incidental phase (ICPM)
Differential phase
Amplitude response and group delay compensation
(Exciter Group Delay Compensator and Notch Diplexer
Equalizer adjustments)
Power limit
Frequency

2.6.6

Aural

a.

Slowly apply aural exciter drive while watching VSWR
and FORWARD power. If a notch diplexer or hybrid
output combiner is used, check its reject load power as
well. Stop at about 50% and use external power metering
to confirm power.

b.

Check the AURAL FWD readings against the external
meter. Refer to power calibration in Section 5 if needed.

c.

Apply aural baseband signals to the appropriate exciter
input(s). Adjust the input level(s) using Section 5 as a
guide for correct deviation.

d.

CompareDC INPUTPOWERand50 voltsupplycurrentto
factory test data at no signal and black picture conditions.

2.7 Remote Control Input and Output

Command In 1A12J21
Status Out 1A12J22
Analog Out 1A12J23

2.7.1

Command In 1A12J21

The Command inputs are optocoupled and mustbe asserted low
to turn on the function. The optocoupler is supplied by the +12
volt supply and require a current sink of 5 ma to activate the
input.

Command Functions:

PIN FUNCTION
1 Transmitter ON
2 Transmitter OFF
3 Visual raise power
4 Visual lower power
5 Aural raise power
6 Aural lower power
7 External interlock
8Spare
9 Loss of video over-ride
10 Exciter comp/mono select
11 Aural group delay select
12 Notch diplexer select
13 Exciter switcher auto select (option)
14 Exciter switcher manual select (option)
15 Exciter switcher a exciter select (option)
16 Exciter switcher b exciter select (option)
17-19 Not used
20 Common (+12V or gnd JP-4 & 5 option)
36-37 Not used

2.7.2

1A12J22: Status Outputs

The Status outputs are open-collector drivers with a 100 Ohm
resistor in series and a 24 volt zener (avalanche)diode clamp to
ground. An internal voltage source of +12 volts can be made
available to the outputs by placing main controller optional
status jumper J21 in the 1-2 position. When in the 2-3 position,
an external voltage source must be supplied. Theopen collector

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WARNING: Disconnect primary power prior to servicing.

Section II - Installation

is30 volts DCmaximum, and maximumcurrentmust be limited
to 48 Ma. Each output is asserted low for status true condition.

2.7.3

Status Functions 1A12J22

PIN FUNCTION
1-16 Common (+12V or gnd JP-4 & 5 opt)
17-19 Not used
20 Transmitter ON status
21 Local status
22 Loss of video status
23 Frequency unlock status
24 Corrector bypass status
25 RF muted status
26 Air fault status
27 High vswr status
28 Foldback active status
29 Module fault status
30 50 volt power supply fault status
31 External interlock status
32 Exciter switcher auto selected (option)
33 Exciter switcher manual selected (option)
34 Exciter switcher A selected (option)
35 Exciter switcher B selected (option)
36 No connection

37 No connection
LOCAL: Indicates the transmitter will not accept remote com­mand inputs. This line will be asserted low when the transmitter
is in the LOCAL mode.

VSWR FOLDBACK ACTIVE: Indicates antenna VSWR has
caused the transmitter to reduce its output power. It will be
asserted low while the foldback is active.

HIGH VSWR(VSWR FAULT): Indicates the modules have not
come up to power at the end of three seconds after a VSWR
overloadset point has beenexceeded. Note thatactivefold-back
will inhibit VSWR overload detection. Upon detection of an
overload, this line will be asserted low.

EXTERNAL INTERLOCK: Indicates the status of the external
interlock. If the interlock is open, a low will be asserted.

RF MUTE: Exciter mute: Indicates that some function has
muted the exciter. Asserted low for mute.

EXCITER FAULT: Indicates exciter fault directly in single
exciter configuration. Asserted low for fault.

SUPPLY FAULT:Indicates the 50 volt powersupply has failed.
Asserted low upon fault.

MODULE FAULT: Indicates one or more of the cabinet RF
modules has faulted off. Asserted low upon fault.

AIR LOSS: Indicates a loss of air flow. Asserted low upon loss
of air flow.

SPARE FAULT: Not used at this time.

2.7.4

Analog Outputs 1A12J23

The analog outputs on the I/O panel provide bothcalibrated and
un-calibrated readings for some functions. The calibrated out­puts are a function of the monitoring system. The raw outputs
come directly from the RF peak detectors. Each output is buff­ered by avoltage follower,with a1 k Ohm resistor inseries with
the signal, before leaving the main controller board.

PIN FUNCTION
1 Visual forward power
2 Visual reflected power
3 Aural forward power
4 Aural reflected power
5 50 volt power supply voltage sample
6 50 volt power supply current sample
7 +5 volt logic supply voltage sample
8 +12 volt logic supply voltage sample
9 -12 volt logic supply voltage sample
10 Inlet temperature
11-14 Not used
15 Exciter status: A Failed
16 Exciter Status: B Failed
17-19 No connection
20-35 COMMON
36-37 No connection

WARNING: Disconnect primary power prior to servicing.

Figure 2-2.

888-2457-001 2-7

Platinum™ Series

2-8 888-2457-001

WARNING: Disconnect primary power prior to servicing.

Figure 2-3.

Section II - Installation

WARNING: Disconnect primary power prior to servicing.

Figure 2-4.

888-2457-001 2-9