unpacking and installation

10 000 WATT FM BROADCAST TRANSMITTERFM10

Page 2-101 October 2002

SECTION 2UNPACKING AND INSTALLATION

PLANNING AND SITE PREPARATION2.1 Transmitter sites for Nautel's FM10 -10 000 watt FM broadcast transmitters should beprepared to receive the transmitter prior to itsdelivery and/or installation. The following must betaken into consideration when preparing new sites. They should be used as the evaluating criteria atexisting sites. It is recommended that allrequirements be incorporated to ensure optimumreliability and performance is obtained.

NOTEFrequent reference is made to terminal boards on the control/monitor PWB (A14). Refer to figureMD-2 as an aid in locating the control/monitorPWB. Refer to the control/monitor PWB's serviceinstruction manual for its assembly detail.

2.1.1 TRANSMITTER ROOMREQUIREMENTS : The following transmitterroom requirements must be addressed when thetransmitter site is being finalized.

2.1.1.1 Transmitter Dimensions: Refer to figureMD-15 for transmitter dimensions. Thesedimensions identify floor space requirements and willassist in determining cable lengths and routing.

2.1.1.2 Transmitter Clearances: A clearance ofat least four feet should be maintained at the frontand rear of the transmitter. Access to the transmittersides is not required for normal maintenance.

2.1.1.3 Air Flushing: There are two air circulationsystems in the transmitter. One system circulates airthrough the power supply compartment while theother circulates air in the RF power module section. The exhaust air of both systems is combined andflushed out through an opening in the top of thetransmitter.

2.1.1.3.1Fans in each RF power module drawcooling air through two large filters in the upper rearof the transmitter; circulate it through the modulesand exhaust it as a low velocity stream throughopenings in the module front panels.

2.1.1.3.2Fans in the power supply draw cooling airthrough two large filters in the lower rear of thetransmitter, into the power supply compartment andcirculate it through the rectifier assemblies and powersupply modules. This air exhausts at the top front ofthe compartment, up the cabinet sides to the openingin the top of the transmitter.

2.1.1.3.3A room air exchange rate of 1100 CFMshould achieve an acceptable intake/exhausttemperature rise. If ducting is used, the staticpressure in the exhaust duct must be slightlynegative, while the static pressure at the rear of thetransmitter must be neutral or slightly positive.

2.1.1.4 Cooling: The transmitter room's ambientair temperature must not exceed 50C. For airconditioning requirements, it can be assumed anominal 35 percent of the power being consumed,from the AC power source, is converted to wasteheat.

NOTEThe worst case waste heat is from a transmitter witha carrier frequency of 107.9MHz that is producing11,000 watts of RF output power. The waste heatfrom this configuration is a nominal 6300 watts. Conversion to British thermal units (BTU's) isaccomplished by multiplying the waste heat wattageby 3.413. In the example given the transmitter iscontributing 21,500 BTU's of waste heat to thetransmitter room.

2.1.1.5 Heating: The transmitter room mustcontain a heating system that will ensure its ambientair temperature does not drop below 0C.

2.1.1.6 Work Area: It is recommended that asuitable work area with an adequate table surface beprovided adjacent to the transmitter to permit benchadjustment/repair of modules.



2.1.2 LIGHTNING PROTECTION:Extremely high voltage/current transients areproduced when a lightning strike occurs. Thesetransients, which are probably the most significanthazard to any solid state transmitter, may be passedto the transmitter through the wiring connecting it toits power source and its antenna system. It isimperative that all practical precautions be taken toprotect the transmitter from this phenomenon. Referto the Lightning Protection section of NautelsRecommendations for Transmitter Site Preparationbooklet for specific protection techniques. Thefollowing requirements are considered to be essential.

2.1.2.1 Station Reference Ground: The site mustcontain a station reference ground, as defined in theLightning Protection section of NautelsRecommendations for Transmitter Site Preparationbooklet. This ground must provide a continuous, lowimpedance path to the earth. The transmittercabinet's designated reference ground point, the shieldof the coaxial feed cable and the ground connectionof the power source's surge protection devices mustbe connected directly to the station reference ground.

2.1.2.2 AC Power Source: All conductors fromthe AC power source should be protected bybi-directional surge protection devices that areconnected between each conductor and the stationreference ground. A surge protector panel, thatcontains suitably rated varistors is available fromNautel for this purpose. If used, the surge protectorpanel should be installed in close proximity to thestation reference ground.

NOTEThe AC power source usually presents the lowestimpedance path to ground potential and willnormally carry most of the lightning induced currentaway from the transmitter site.

When lightning hits the power source, a significantamount of induced current may flow towards thetransmitter. In this instance, the objective is toroute the current around the transmitter, instead ofthrough it, to the best ground available.

2.1.2.3 Antenna Feed Cable: The shield of theantenna feed coaxial cable should be connecteddirectly to the station reference ground where it entersthe building. The centre conductor and the shield of

the feed cable should pass through a ferrite toroidpositioned between the shield ground at the buildingentrance and the shield termination at the transmitterreference ground. This toroid is transparent to theRF signal, but will present impedance to transientsoriginating in the antenna.

2.1.2.4 Antenna Tower: The antenna tower is themost likely target for lightning strikes. It isimperative that it contain lightning protection devicesas the first line of defense against lightning strikes. For towers which are grounded at their base, it isrecommended that a coaxial, gas-type spark gap beinstalled where the coax enters the transmitterbuilding.

2.1.2.5 External Control/Monitor Wiring: Allexternal control/monitoring wiring, that may besubjected to lightning induced transients, should beinterfaced to the station reference ground by surgeprotection devices where they enter the building. Inaddition, all conductors and their shields should passthrough a ferrite toroid which is positioned betweenits surge protection device and the transmitter. Thistoroid will be transparent to control/monitor signals,but will present an impedance to lightning inducedtransients.

2.1.3 ELECTRICAL POWER: Thetransmitter is configured during manufacture tooperate from one of a variety of 50/60Hz three phaseac power sources. The option selected is specified bythe purchaser. Refer to table 1-1 for an itemizedlisting of standard voltage options. The AC powersource must meet all of the following requirements:

2.1.3.1 Nominal Voltage: The primary windingof the main AC power transformer contains tapoptions to accommodate voltages that differ from theideal voltage of the power source. There are five tapoptions on the three-phase power transformers (5%increments). The appropriate tap is selected duringinstallation to provide the optimum nominal voltagefor the transmitter.

2.1.3.2 Voltage Stability: The AC power source'snominal voltage must be stable to within plus andminus ten percent under all loading conditions. Thetransmitter contains circuitry that maintains the RFoutput at the preset carrier level for voltagevariations within this range.



2.1.3.3 Power Consumption: When operating at11 000 watts RF output, power consumption is anominal 17.9kVA. It is recommended the ac powersource have a 25% over capacity (minimum rating of23kVA) to ensure adequate regulation.

2.1.3.4 External Switching: It is recommendedthat all voltage carrying conductors from the ACpower source be controlled by an external switchingbox that is located in close proximity to thetransmitter. This switch box should be clearlymarked TRANSMITTER EMERGENCY ON/OFFSWITCH.

2.1.4 ANTENNA SYSTEM: The antennasystem must present an impedance of 50 j0 ohms atthe carrier frequency. Circuitry within thetransmitter will begin to reduce the forward powerwhen the reflected power level reaches 440 watts(1.5:1 VSWR relative to 11 000 watts forwardpower). This will prevent damage to the transmitterfrom high VSWR loads.

2.1.4.1 RF Feed Cable: The feed cableinterconnecting the transmitter and the antennasystem should be a suitably rated coaxial cable. Thetransmitter's RF output is configured to accept anon-gas type 3-1/8 inch EIA flange (male)connection. The RF feed cable's transmitter end mustbe terminated by the appropriate male innerconnector (bullet) which is not provided with thetransmitter.

2.1.5 RF DRIVE SOURCE: An exciter thatprovides a frequency modulated RF drive in the 87.5to 107.9MHz frequency band, at a nominal of 20watts, into a 50-ohm load is required. A 19-inchopening in the cabinet can be requested which willaccommodate Nautel's NE50 exciter. All otherexciters must be mounted externally. The exciter'sRF output cable (W39) is provided with thetransmitter. Any additional cabling required by anexternal installation is not provided. The excitershould contain an external on/off interlock or RFmute capability. A set of form C contacts is providedby the transmitter, at TB1 of the control/monitorPWB (A14), as the exciter interlock/RF mute control. If the exciter has an automatic level control (ALC)circuit, it should be enabled, if possible.

2.1.6 SAFETY INTERLOCK : The externalsafety interlock circuit is connected between TB1-11and TB1-12 on the control/monitor PWB (A14). Itmust present a short circuit (low impedance) betweenthe terminals when the interlock circuit is intact and itis safe to enable the RF output. It must present anopen circuit when any interlock switch has beenactivated and the RF output is required to beinhibited. Any number of serial interlock switchesmay be installed.

NOTEThe RF output will be restored, at an exponentialrate, over a 250 millisecond period, after theintegrity of the external interlock has been restored.

2.1.7 REMOTE CONTROL CIRCUITS : See figure 2-1. The on/off status of the transmitter'sRF power stage, RF power level control, and theprotection reset functions can be controlled from aremote location, using switching circuits that complywith the following:

NOTERemote control inputs have influence on transmitteroperation only when set to REMOTE. The externalcontrol lines are interfaced with the transmitterthrough opto-couplers located on the control/monitor PWB (A14). A control input is activatedwhen +24V is present across its (+)/(-) inputs.

2.1.7.1 RF On Control: This remote controlcircuit must be the equivalent of a single pole,momentary contact switch. The switch must be inthe 'closed' position when pressed and return to the'open' position when released. The switch must beconnected such that, when activated, +24V isconnected between the RF ON (+) (TB1-3) and RF ON(-) (TB1-4) inputs. The operation of this remotecontrol will cause the transmitter to turn on.

2.1.7.2 RF Off Control: This remote controlcircuit must be the equivalent of a single pole,momentary contact switch. The switch must be inthe 'closed' position when pressed and return to the'open' position when released. The switch must beconnected such that, when activated, +24V isconnected between the RF OFF (+) (TB1-1) and RFOFF (-) (TB1-2) inputs. The operation of this remotecontrol will cause the transmitter to turn off.



2.1.7.3 Protection Reset: This remote controlcircuit must be the equivalent of a single pole,momentary contact switch. The switch must be inthe 'closed' position when pressed and return to the'open' position when released. The switch must beconnected such that, when activated, +24V isconnected between the PROTECTION RESET (+)(TB1-5) and PROTECTION RESET (-) (TB1-6)inputs. The operation of this remote control willcause the RF power protection circuits to be reset,allowing the RF output to be restored (if possible),after a fault has caused the transmitter to be inhibitedindefinitely.

2.1.7.4 Power Increase: This remote circuit mustbe the equivalent of a single pole, momentary contactswitch. The switch must be in the 'closed' positionwhen pressed and return to the 'open' position whenreleased. The switch must be connected such that,when activated, +24V is connected between thePOWER INCREASE (+) (TB1-7) and POWERINCREASE (-) (TB1-8) inputs. The operation of thisremote control will cause the RF output power to beincreased.

2.1.7.5Power Decrease: This remote circuit mustbe the equivalent of a single pole, momentary contactswitch. The switch must be in the 'closed' positionwhen pressed and return to the 'open' position whenreleased. The switch must be connected such that,when activated, +24V is connected across thePOWER DECREASE (+) (TB1-9) and POWERDECREASE (-) (TB1-10) inputs. The operation ofthis remote control will cause the RF output power tobe decreased.

2.1.7.6Low Power Select: This remote circuitmust be the equivalent of a single pole single throwswitch. The switch must be connected such that,when activated, ground potential is applied to LOWPWR SELECT (TB1-18) input. The operation of theremote control will cause the RF output to be set tothe level adjusted for low power operation.

NOTEA 24V supply is available at TB2-15 of thecontrol/monitor PWB (A14). The (+) terminal ofeach control input may be connected to TB2-15,which will allow activation of the input bymomentarily connecting the appropriate (-) terminalto ground.

2.1.8 EXCITER INTERLOCK: Protectioncircuitry within the transmitter will operate theexciter interlock relay in an attempt to mute theexciter's RF output when the exciter forward power isexcessive or when the transmitter is turned off. Referto exciter service manual and determine the requiredcontact arrangement, noting that:

- If a closed contact (normally open) is requiredto mute the exciter's RF output, connect theexciter interlock wires between TB1-13 (N/O)and TB1-15 (COM) of the control/monitorPWB (A14).

- If an open contact (normally closed) is requiredto mute the exciter's RF output, connect theexciter interlock wires between TB1-14 (N/C)and TB1-15 (COM) of the control/monitorPWB (A14).

2.1.9 RF PERFORMANCE MONITORING : Forward power, reflected power and a sample of theRF output are available for external monitoring.

2.1.9.1 Forward Power Level: A buffered DCvoltage that is representative of the forward powerlevel is available at the FWD PWR SAMPLEterminal (TB2-12) of the control/monitor PWB (14). This voltage varies according to the square root ofthe forward power level and will be 12.6 0.6 voltsDC at 11 000 watts. A ground terminal is providedat TB2-13 as a sample reference.

2.1.9.2 Reflected Power Level: A buffered DCvoltage that is representative of the reflected powerlevel is available at the REFLD PWR SAMPLEterminal (TB2-14) of the control/monitor PWB(A14). This voltage varies according to the squareroot of the reflected power level and will be 7.1 0.4volts DC at 440 watts. A ground terminal isprovided at TB2-13 as a sample reference.

2.1.9.3 RF Output Sample: A -44 2 dB sampleof the RF output (RF Monitor) is available at RFMONITOR BNC coaxial connector J2. This output isnormally applied to a station modulation monitor, butmay be connected to an oscilloscope duringmaintenance. The RF Monitor output will be anominal 4.7 volts RMS, into a 50 ohm load, when theRF output power level is 11 000 watts.



2.1.9.4 Exciter Power Sample: A DC voltage,representative of the exciter forward power level, isavailable at the EXCTR PWR SAMPLE terminal (TB2-16) of the control/monitor PWB (A14). This voltagevaries according to the square root of the exciterforward power level and will be 6.0 0.5 volts DC at20 watts. The voltage source has an outputimpedance of 100K ohms.

2.1.9.5 DC Input Current Level: A buffered DCvoltage that is representative of the TOTAL currentlevel is available at the TOTAL CUR SAMPLE terminal(TB1-17) of the control/monitor PWB (A14). Thisvoltage varies linearly with the TOTAL current andwill be a nominal 2.00 volts DC at 200 amperescurrent (10mV/amp).

2.1.9.6 DC Input Voltage Level: A buffered DCvoltage that is representative of the B+ volts level isavailable at the B+ VOLTS SAMPLE terminal(TB1-16) of the control/monitor PWB (A14). Thisvoltage varies linearly with the B+ VOLTS and will bea nominal 0.5 volts DC at 70 volts (7.1mV/V). Thevoltage source has an output impedance of 27.1Kohms.

2.1.10 REMOTE ALARM INDICATIONS : Outputs that indicate stress thresholds for criticalparameters have been exceeded are available onterminals of the control/monitor PWB (A14). Eachoutput (except LOW BATTERY alarm) has aDarlington transistor that provides an open collectorwhen inactive (no alarm) and a current-sink-to-ground when an alarm condition exists. Eachmonitoring circuit must present impedance, betweenthe switching transistor and a positive DC voltagesource, that results in a current flow of 40milliamperes or less. Each circuit's positive voltagesource must not exceed 28 V. Alarm outputs areprotected against transients and/or over voltage by a33 volt zener diode.

NOTEIn most cases the RF output is inhibited when analarm condition is sensed. When the cause of thealarm has been removed, the RF output will berestored, at an exponential rate, over a 250millisecond period. However, some protectioncircuits will require activation of the PROTECTRESET control before the RF output is restored.

2.1.10.1IPA/RF Fail Alarm: The IPA/RF FailAlarm output is applied to the IPA/RF FAIL ALARMterminal TB2-1 of the control/monitor PWB (A14). During normal operation, the output is an opencollector. When the IPA module's RF drive input isnot satisfactory due to an exciter fault; or the RFoutput of the IPA (intermediate RF) falls below 80%of its normal level due to an IPA PA failure or anIPA power supply fault; or the IPA output has anexcessive SWR due to faulty connections/ cabling;IPA/RF FAIL ALARM will switch to a current-sink-to-ground. The RF output will be inhibited.

NOTEOther alarm conditions which cause the RF outputof the transmitter to be inhibited will also activatethe IPA/RF FAIL ALARM.

2.1.10.2 PA/Module Fail Alarm: ThePA/Module Fail Alarm output is applied to thePA/MOD FAIL ALARM terminal TB2-2 of thecontrol/monitor PWB (A14). During normaloperation, the output is an open collector. When thePA Volts current in any RF power module falls morethan 17% (nominally) below the average modulecurrent, possibly due to a PA failure; or excessivetemperature is sensed within an RF power moduledue to a fan failure or air blockage; or a low RF drivelevel is detected at the input of an RF power moduledue to faulty connections/cabling, the PA/MOD FAILALARM output will switch to a current-sink-to-ground. The RF output will be reduced.

2.1.10.3High Reflected Power Alarm: The HighRefld Pwr Alarm output is applied to the HIGHREFLD PWR ALARM terminal TB2-3 of the control/monitor PWB. During normal operation, the outputis an open collector. When the reflected powerexceeds 100 watts (1.4:1 SWR relative to 11 000watts of RF output), due to antenna icing or faultyRF feed cabling, the HIGH REFLD PWR ALARMoutput will switch to a current-sink-to-ground. Whenthe reflected power exceeds 440 watts, the RF outputforward power will be gradually reduced by thetransmitter's reflected power monitoring circuitry. The RF output will be inhibited if the forward poweris reduced below 1500 watts or the peak reflectedpower exceeds 1220 watts (2:1 SWR relative to11 000 watts of RF output).



2.1.10.4AC Power Alarm: The AC Alarm outputis applied to the AC PWR ALARM terminal TB2-4 ofthe control/monitor PWB (A14). During normaloperation, the output is an open collector. When theAC power source voltage goes more than 15% aboveor 15% below the ideal voltage for the powertransformer's selected primary winding taps, or oneof the three AC input phases is lost, the AC PWRALARM output will switch to a current-sink-to-ground. The RF output will be inhibited.

2.1.10.5High Temperature Alarm: The HighTemp Alarm output is applied to the HIGH TEMPALARM terminal TB2-5 of the control/monitor PWB(A14). During normal operation, the output is anopen collector. When sensors detect excessivetemperature in an RF power module, IPA module orpower supply rectifier, the HIGH TEMP ALARMoutput will switch to a current-sink-to-ground. Thefollowing will cause a High Temp Alarm.

- Temperature of either three-phase rectifierassembly exceeds 90C. The transmitter's RFoutput will be inhibited.

- Temperature in the IPA module exceeds 73C. The RF output will not be affected.

- Temperature in an RF power amplifier moduleexceeds 85C. The affected module will beswitched off, reducing the RF output.

2.1.10.6PA Volts/Combiner Alarm: The PAVolts/Combiner Alarm output is applied to the PAVDC/CMBR ALARM terminal TB2-6 of the control/monitor PWB (A14). During normal operation, theoutput is an open collector. When the PA voltageapplied from the switching power supplies to the RFpower modules exceeds 55 VDC or the forwardpower is too low for the level of PA voltage appliedto the RF power modules, the PA VDC/CMBR ALARMoutput switches to a current-sink-to-ground. The RFoutput is inhibited. Other alarm conditions whichcause a switching power supply to be inhibited, suchas excessive switching power supply temperature orlow PA volts, will activate the PA Volts/Combineralarm.

2.1.10.7Interlock Open Alarm: The InterlockOpen Alarm output is applied to INTLK OPENALARM terminal TB2-7 of the control/monitor PWB(A14). When the interlock circuit is intact (short

circuit) the output is an open collector. When theinterlock is open the INTLK OPEN ALARM outputswitches to a current-sink-to-ground. The RF outputwill be inhibited.

2.1.10.8Fan Fail Alarm: The Fan Fail Alarmoutput is applied to FAN FAIL ALARM terminal TB2-8of the control/monitor PWB (A14). When the fourfans located in the power supply compartment andthe two fans on the lower, rear panel are functioningnormally, the output is an open collector. If one ormore of the fans should fail, the Fan Fail Alarmoutput switches to a current-sink-to-ground. The RFoutput will not be affected.

2.1.10.9Low Battery Alarm: The Low BatteryAlarm output is applied to LOW BATTERY ALARMterminal TB2-17 of the control/monitor PWB (A14). When the backup battery voltage drops below 4.2V,the Low Battery Alarm output switches to a currentsink-to-ground. The RF output is not affected. TheLow Battery Alarm output is an open collector whenthe battery voltage is acceptable.

2.1.11 REMOTE STATUS INDICATIONS : External monitoring outputs that indicate the statusof operator controlled circuits are available atterminals of TB2 on the control/monitor PWB (A14). All status outputs, except REMOTE STATUS, employa Darlington transistor. Each output provides anopen collector when inactive and a current-sink-to-ground when active. Each external monitoring circuitmust present an impedance, between the transistorand a positive DC voltage source, that will result in acurrent flow of 40mA or less. The voltage sourcemust not exceed 28V. Each output is protectedagainst transients and/or over voltage by a 33 voltzener diode.

2.1.11.1Remote Status: The Remote Statusoutput is applied to REMOTE STATUS terminalTB2-11 of the control/monitor PWB (A14). Whenthe control/monitor panel's CONTROL switch is set toLOCAL , this output is an open circuit (open relaycontacts) and the remote control functions have noinfluence on the transmitter's on/off status or theprotection/alarm reset functions. When theCONTROL switch is set to REMOTE, the REMOTESTATUS output is a connected to ground. Thetransmitter's on/off status and the protection/alarmreset functions can be controlled remotely.



2.1.11.2RF On Status: The RF On Status outputis applied to RF ON STATUS terminal TB2-9 of thecontrol/monitor PWB (A14). When the externalinterlock is open or a local or remote RF OFF hasbeen initiated, this output is an open collector. Whenthe interlock circuit is intact and a local or remote RFON has been initiated, the RF ON STATUS output is acurrent-sink-to-ground.

2.1.11.3Transmitter Ready Status: The XMTRReady Status output is applied to XMTR READYterminal TB2-10 of the control/monitor PWB (A14). When the AC/DC power supply is not producing aregulated +5V (no unregulated 24 V) and the controlfunctions are not operable, this output is opencollector. When the AC/DC power supply isproducing a regulated +5V, and control functions areoperable (locally or remotely as appropriate), theXMTR READY output is a current sink to ground.

2.1.12 PARTS SUPPLIED BY NAUTEL : Thefollowing parts/materials are supplied by or areavailable from Nautel.

2.1.12.1Parts Removed During Disassembly ForShipment: All the parts that were removed duringdisassembly for shipment and are required toreassemble the transmitter are provided. An itemizedlisting of the parts is not provided in this manual, asthe extent of disassembly is determined by the methodof shipment. Detailed packing lists will be includedwith each transmitter shipment.

2.1.12.2Ancillary Parts: An ancillary parts kit isprovided with each transmitter. These parts areprovided to ensure initial installation is not delayedbecause of a lost or damaged part and to allow theuser to maintain the equipment until a comprehensivemaintenance spares kit is obtained. They are notintended to be long term maintenance spares. Detailed information about these parts is not includedin this manual. The ancillary parts kit contents isitemized in its packing list.

2.1.13 PARTS REQUIRED BUT NOTSUPPLIED BY NAUTEL : Some parts andmaterials required to complete an installation are notsupplied with the transmitter or are not provided byNautel. The user must supply these parts. Eachinstallation will dictate the parts required, and willnormally include the following:

- A suitable 50-ohm RF output coaxial cable, terminated by a 3 1/8 inch EIA connector, withinner conductor, at the transmitter end.

- All external control/monitor wiring, includingtheir associated terminating devices andconduit/conduit clamps.

- All electrical power cables, including conduit,terminating devices and conduit clamps.

2.1.13.1Surge Protector Panel: A surge protectorpanel, that is rated for the AC power source to beapplied to the transmitter, is available from Nautel. The surge protector panel will help protect thetransmitter against lightning induced voltagetransients on the AC power source.

2.1.14 TEST EQUIPMENT AND SPECIALTOOLS: The test equipment required to install andmaintain the transmitter is listed in table 1-2 and thespecial tools are listed in table 1-3.



NON-TECHNICAL PRE-COMMISSIONING2.2 On delivery of the transmitter, thefollowing non-technical procedures should beobserved and completed.

NOTENon-technical procedures are defined as being thoseprocedures that do not require technical knowledgeof transmitter circuits or their operation tocomplete.

2.2.1 ACCEPTANCE OF SHIPMENT : Allshipments should be inspected for transit damageprior to acceptance.

Sufficient manpower or mechanical assistanceshould be on hand when removing the transmittercabinet from its packing crate. The crate mayweigh in excess of 250 kilograms (550 pounds)

2.2.2 UNPACKING INSTRUCTIONS : Theunpacking instructions are dictated by method ofpackaging for shipment. Transmitters not shipped byelectronic equipment moving specialists may bepacked in wooden crates, with the number of cratesdetermined by the extent of disassembly for shipment. Instructions accompany any crate that requiresspecial unpacking information. Packing lists providedetailed listings of shipment contents.

NOTEThe transmitter will be partially disassembled forshipment. As a minimum, the intermediate poweramplifier (IPA) module, the RF power modules andthe power transformer assembly will be removed. The extent of any additional disassembly will bedictated by the shipping method, site informationprovided by the user and the handling equipment ofthe mover.

2.2.3 ASSEMBLY/INSTALLATION : Thefollowing paragraphs provide step-by-step assemblyinstructions for the FM10 transmitter, which ispartially disassembled for shipment.

NOTEPartially disassembled transmitters should beplaced in their final location prior to completingassembly.

2.2.4 INSTALLATION OF EXTERNALCONTROL/MONITOR WIRING : Connectwiring originating from the remote control/monitoringdevices to terminating points on control/monitorPWB A14, as follows:

NOTERemote control and remote monitor wiringterminate on the control/monitor PWB (A14). Referto figure MD-2 as an aid to locating the control/monitor PWB and to its service instruction manualas an aid in locating terminal blocks TB1/TB2. Theterminal blocks will accept wire sizes #14 through#24.

The user must punch out an appropriate sized cableentry hole where the control/monitor cables enterthe cabinet. The preferred entry point is the top left-hand side of the cabinet. Refer to figure MD-15 todetermine the recommended cable entry location.

(a) Punch or verify a cable entry hole for thecontrol/monitor wiring has been punched in thecabinet at the desired cable entry point.

(b) Obtain four 38mm ferrite toroids (LXP38)from the ancillary parts kit.

(c) Route control and monitor wires; through cableentry hole determined in step (a), to the vicinityof the control/monitor PWB (A14).

(d) Pass all control/monitor wires, including theirshields, through two ferrite toroids. The wiringto TB1 should pass through one pair of toroidsand the wire to TB2 should pass through theother pair. If practical, the wires should passthrough a minimum of two times (two turns).

(e) Using figure 2-1 as a guide, determine thespecific destination of each wire.

(f) Cut each wire to the required length and removeapproximately 3/8" of insulation from the endof each conductor.

(g) Insert the control/monitor wiring into theterminals of the control/monitor PWB (A14)'sTB1 and TB2, as identified in figure 2-1. Ensure their securing screws are firmlytightened.



NOTEDC return for remote alarm/status monitoringcircuit's DC power source should be obtained fromTB2-18.DC return for the forward/reflected powermonitoring circuits should be obtained from TB2-13. Refer to paragraph 2.1.8 to install exciterinterlock wiring.

2.2.5. INSTALLATION OF ACPOWER SUPPLY ASSEMBLY : Install the ACpower supply (A1) in the cabinet's power supplycompartment, noting it consists of the powertransformer and two B+ Volts chokes, as follows:

(a) Disconnect the lower, rear panel from the backof the cabinet, noting there is a 2 AWG blackwire connected to it and swing it off to one side. Ensure painted surfaces are protected and thewiring is not damaged.

NOTEIt may be necessary to disconnect the four 22 AWGwires (#99, 100, 101 and 102) from TB2 whenremoving the lower, rear panel.

(b) Open the power supply control panel andsecure it in a manner that will prevent it fromobstructing access to the interior of the cabinet.

(c) Remove the power supply air blocker, noting itprevents frontal access to the rear power supplycompartment. Remove the two screws securingit to the IPA power supply cover at the bottomand the two screws securing it to the horizontalair blocker at the top. Then, carefully removethe air blocker. Retain all hardware.

(d) Locate an unidentified black 2 AWG jumperwire that will be attached to the powertransformer's ground stud, noting it is locatedadjacent to the safety ground stud at the rear ofthe cabinet.

(e) Locate three black 2 AWG wires (#305, 306and 307) that will be attached to the powertransformer (A1T1), noting they are tyrappedtogether at the left-hand side of the powersupply compartment, when viewed from rear. Remove shipping tyraps.

(f) Locate two black 2 AWG wires (#314 and 318)that will be attached to B+ volts choke A1L1, notingthey are tyrapped together at the right-hand side ofthe power supply compartment when viewed fromrear. Remove shipping tyraps.

(g) Locate two black 2 AWG wires (#315 and 319)that will be attached to B+ volts choke A1L2,noting they are tyrapped together at the left-hand side of the power supply compartment,when viewed from rear. Remove shippingtyraps.

(h) Locate six black 6 AWG wires (#308, 309,310, 311, 312 and 313) that will be attached tothe power transformer (A1T1), noting they aretyrapped together in the back of the powersupply compartment, when viewed from rear. Remove shipping tyraps.

(i) Locate connector P15 that will be attached toJ1 of the power supply, noting it has beensecured to the wiring harness at the right-handside of the power supply compartment, whenviewed from the rear. Remove shipping tyraps.

The power supply weighs approximately 200kilograms (441 pounds). Sufficient manpower ormechanical assistance should be available, toprevent injury to personnel or damage to theequipment.

(j) Position the power supply at the rear of thetransmitter with its power transformer'sprimary terminals (H1, H2 and H3) facingaway from the cabinet.

(k) Remove the bolts securing the power supply toits shipping pallet.

(l) Note the four 3/8-16 x 1 bolts, flat washers andsplit washers that are threaded into thetransformer mounting holes in the cabinetbottom. Remove these bolts and retain.



NOTEIt is recommended a six-foot long 2 x 4 board beused, in conjunction with the lifting bracket mountedon top of the power supply, as an aid in lifting thepower supply into the transmitter.

(m) Temporarily remove P33 from J1 of powersupply module A9 in the front of thetransmitter, noting it prevents access to thepower supply's lifting bracket when connected.

(n) Using extreme care to avoid damage to wiringand/or assemblies, place the power supply inthe transmitter and align its base with themounting holes on the bottom of the cabinet(the transformer's primary terminals should befacing the rear).

NOTESince the wires located in step (h) are difficult toaccess, it may be necessary to connect them to theappropriate terminals of the power transformer (seetable 2-1) before aligning the power transformerwith the cabinet's mounting holes.

(o) Secure the power transformer to the cabinetusing the four 3/8-16 x 1 bolts and associatedflat and split washers removed in step (l).

(p) Connect the wiring located in steps (d) thru (h)to the appropriate terminals of the powertransformer (A1T1) as identified in table 2-1.

(q) Plug connector P15, located in step (i), into J1of the power supply.

(r) Plug connector P33, removed in step (m), intoJ1 of switching power supply A9 in the front ofthe transmitter.

(s) Replace the power supply air blocker using thehardware retained in step (c).

Do not operate the transmitter with the powersupply air blocker removed.

Table 2-1 Power Transformer Wire Connections

A1 WIRE WIRE WIRE SOURCETERM # SIZE COLOUR

T1-H1 305 2 BLK A4CB1A-LOADT1-H2 306 2 BLK A4CB1B-LOADT1-H3 307 2 BLK A4CB1C-LOAD

T1-X1 308 6 BLK A2A1U1-ACT1-X2 309 6 BLK A2A1U2-ACT1-X3 310 6 BLK A2A1U3-ACT1-Y1 311 6 BLK A3A1U1-ACT1-Y2 312 6 BLK A3A1U2-ACT1-Y3 313 6 BLK A3A1U3-AC

L1-2 314 2 BLK A2A1 (+)L2-1 315 2 BLK A3A1 (+)

L1-1 318 2 BLK A4E1L2-2 319 2 BLK A4E2

T1-Gnd -2 BLK Ground

(t) Do not install the lower, rear panel at this time. Access to the TB1 in the power supplycompartment is required when installing the acpower source wiring as detailed in paragraph2.2.6.

NOTEThe lower, rear panel, when it is installed, preventsunintentional access to the power supplycompartment, which contains exposed ac voltages. If the correct primary winding tap connections forthe power transformer have not been chosen in step(p), the panel will also have to be removed duringthe technical pre-commissioning proceduresdescribed in the transmitter's technical manual.

2.2.6 INSTALLATION OF AC POWERSOURCE WIRING: Connect the wiring from theAC power source to the appropriate terminals ofterminal block TB1, noting it is located at the lower,rear, left-hand side of the cabinet.

(a) Verify a suitable cable entry hole (punched inthe top or existing in the bottom) is availablefor the ac power source wiring at the desiredcable entry point.



Table 2-2 Three-Phase AC Power Connection

TB1-1 LINETB1-2 LINETB1-3 LINETB1-5 GROUND

NOTEIf top-entry is desired, the user must punch anappropriate sized cable entry hole in the top of thecabinet. Figure MD-15 identifies the preferred top-entry location. It is recommended the wiring beinstalled in a metal conduit and the conduit berigidly attached to the cabinet at the entry hole.

If bottom-entry is desired (when the wiring is in afloor mounted trench or the transmitter is sitting ona pedestal), two knock-outs which are located at therear of the cabinet, are available for cable entry.

(b) Obtain two 72mm ferrite toroids (LY30) fromthe ancillary parts kit.

(c) Route the AC power source wires through theselected cable entry hole to the vicinity of theAC power terminal block (TB1). Refer tofigure MD-2 to determine its location.

(d) Pass all AC power source wires, including theground wire, through the ferrite toroidsobtained in step (b). If practical, wires shouldpass through a minimum of two times (twoturns).

(e) Using table 2-2 as a guide, determine thedestination of each wire.

(f) Cut each wire to the required length and removeapproximately 1.9cm (0.75 inches) ofinsulation from the end of each conductor.

(g) Connect the wiring to the terminals of TB1 astabulated in table 2-2. Ensure securing screwsare firmly tightened.

NOTESelection of the power transformer's primarywinding taps is completed during the technical pre-commissioning procedures (paragraph 2.3).

2.2.7 IPA/RF POWER MODULEINSTALLATION: Install the IPA and RF powermodules as follows:

(a) Remove the upper, rear panel, noting there is asafety ground wire connected to it. Temporarily remove this wire to allow panelremoval.

(b) Locate and remove a plastic bag containing theRF power/IPA module retaining hardware,noting it should be fastened to a cable anchoredto the rear of an RF power module's supporttray.

(c) Locate the wiring (three coaxial cables, a cableterminated by a 5-contact connector and a cableterminated by a 1-contact connector) that willbe connected to the IPA module, noting thethree coaxial cables (W37, W38 and W40) arelocated in the ancillary kit and the 5-contactand 1-contact connectors are secured to the rearof the IPA module's support tray.

(d) Locate the wiring (seven coaxial cables, a cable terminated by a 5-contact connector, anda cable terminated by a 3-contact connector)that will be connected to each RF powermodule, noting the seven coaxial cables arelocated in the ancillary kit and the 5-contactand 3-contact connectors are secured to the rearof the associated RF power module's supporttray.

(e) Locate the 36 coaxial connectors that will beconnected to the RF combiner/final filter,noting they are part of the coaxial cableslocated in step (d).

(f) Locate the 8 coaxial connectors that will beconnected to the intermediate RF drive splitter,noting they are part of the coaxial cableslocated in steps (c) and (d).

(g) Open the control/monitor panel and secure it ina manner that will prevent it from obstructingaccess to the RF power module support trays.

(h) Open blank panel immediately beneath thecontrol/monitor panel and secure it in a mannerthat will prevent it from obstructing access toIPA/RF power module support trays.



(i) Install the six RF power modules (A18 thruA23) in the appropriate support trays (seefigure MD-1). Ensure retaining studs of eachmodule pass thru the holes in the rear of itssupport tray.

(j) Install the IPA module (A17) in its support tray(see figure MD-1). Ensure its retaining studs -pass thru the holes in the rear of its supporttray.

NOTEFlat washers and combination hex nut/star washersrequired to secure the modules to their support trayare in the plastic bag located in step (b).

(k) Secure the IPA and RF power modules to theirsupport trays by installing and firmly tighteninga #10 flat washer and combination 10-32 hexnut/star washer to the retaining stud protrudingthrough each support tray.

RF power module retaining hardware provides theDC return path for the PA VDC power source. Ensure the retaining hardware is firmly tightened.

(l) Complete the electrical interconnection of theIPA and RF power modules by mating theconnectors that terminate the coaxial cables andwiring that were located in steps (c) and (d) astabulated in table 2-3.

NOTERemove all plastic cap-plugs from BNC connectors.

(m) Complete the electrical interconnection of theRF combiner/final filter by mating theconnectors that terminate coaxial cables locatedin step (e) as tabulated in table 2-3.

(n) Complete the electrical interconnection of theintermediate RF drive splitter by mating theconnectors that terminate coaxial cables locatedin step (f) as tabulated in table 2-3.

(o) Do not install the upper, rear panel at this time.Access to the rear of the IPA module isrequired to connect the RF drive from theexciter. If the exciter is located in the cabinet,access is also required to complete itsinstallation.

Table 2-3 Module Connector Mating Information

RF POWER CABLE DESTINATIONMODULE

IPA A17J1 W37P1 W37P2 A15J7IPA A17J2 W38P1 W38P2 A15J8IPA A17J3 P41 - -IPA A17J4 P4 - -IPA A17J5 W40P2 W40P1 A16J2

A A18J1 W1P1 W1P2 A24J1A A18J2 W2P1 W2P2 A24J2A A18J3 W3P1 W3P2 A24J3A A18J4 W4P1 W4P2 A24J4A A18J5 W5P1 W5P2 A24J5A A18J6 W6P1 W6P2 A24J6A A18J7 P35 - -A A18J8 P5 - -A A18J9 W41P2 W41P1 A15J1

B A19J1 W7P1 W7P2 A24J7B A19J2 W8P1 W8P2 A24J8B A19J3 W9P1 W9P2 A24J9B A19J4 W10P1 W10P2 A24J10B A19J5 W11P1 W11P2 A24J11B A19J6 W12P1 W12P2 A24J12B A19J7 P36 - -B A19J8 P6 - -B A19J9 W42P2 W42P1 A15J2

C A20J1 W13P1 W13P2 A24J13C A20J2 W14P1 W14P2 A24J14C A20J3 W15P1 W15P2 A24J15C A20J4 W16P1 W16P2 A24J16C A20J5 W17P1 W17P2 A24J17C A20J6 W18P1 W18P2 A24J18C A20J7 P37 - -C A20J8 P7 - -C A20J9 W43P2 W43P1 A15J3

D A21J1 W19P1 W19P2 A24J19D A21J2 W20P1 W20P2 A24J20D A21J3 W21P1 W21P2 A24J21D A21J4 W22P1 W22P2 A24J22D A21J5 W23P1 W23P2 A24J23D A21J6 W24P1 W24P2 A24J24D A21J7 P38 - -D A21J8 P8 - -D A21J9 W44P2 W44P1 A15J4

E A22J1 W25P1 W25P2 A24J25E A22J2 W26P1 W26P2 A24J26E A22J3 W27P1 W27P2 A24J27E A22J4 W28P1 W28P2 A24J28E A22J5 W29P1 W29P2 A24J29E A22J6 W30P1 W30P2 A24J30E A22J7 P39 - -E A22J8 P9 - -E A22J9 W45P2 W45P1 A15J5

F A23J1 W31P1 W31P2 A24J31F A23J2 W32P1 W32P2 A24J32F A23J3 W33P1 W33P2 A24J33F A23J4 W34P1 W34P2 A24J34F A23J5 W35P1 W35P2 A24J35F A23J6 W36P1 W36P2 A24J36F A23J7 P40 - -F A23J8 P10 - -F A23J9 W46P2 W46P1 A15J6



2.2.8 EXCITER INSTALLATION: Install theexciter (internally or externally) and connect itsinterconnecting electrical wiring as follows:

(a) Verify the exciter has been subjected to afunctional test, it has been set to generate thedesired carrier frequency (c), and it is fullyoperational.

2.2.8.1 Internally Mounted Nautel Exciter:When the transmitter has been configured toaccommodate the internal installation of a Nautel FMdigital exciter, install it as follows:

NOTEAn exciter mounting kit must be installed in thespace identified as being reserved for internalexciter mounting in figure MD-1. Unless otherwisespecified in contract documents, this kit will beinstalled when a Nautel exciter is to be utilized asthe RF drive source.

The blank panel depicted in figure MD-1(immediately under the hinged access panel) will notbe installed when an exciter mounting kit isinstalled.

The AC voltage applied to the EXCITER AC ONLYreceptacle (J1) is dependent on the RMS voltage ofthe transmitter's 3 AC power source. It will be115 VAC RMS when the phase-to-phase voltage ofthe power source is 208 VAC or it will be 230 VACRMS when the phase-to-phase voltage is 380/415VAC. Prior to plugging the exciter's AC powercord into the EXCITER AC ONLY receptacle, verifythe exciter is configured to operate from theavailable voltage. Failure to observe thisprecaution may result in damage to the exciter.

(a) Verify the exciter's AC input voltage selectioncard is oriented to select the AC voltageavailable at the EXCITER AC ONLY receptacle.

NOTENautel exciters have provision to operate from 115VAC or 230 VAC by changing the orientation of avoltage selection card in their line filters.

(b) Install the exciter in the exciter mountingdrawer slides, noting it is installed from thefront of the cabinet.

(c) Plug the exciter's AC power cord into theEXCITER AC ONLY receptacle, noting it islocated on the rear panel immediately below the'E' RF power module.

(d) Obtain the six foot RF coaxial cable that isterminated by BNC connectors labelledW39P1/W39P2 from the ancillary parts kit andinstall it between the RF output connector ofthe exciter and the EXCITER I/P connector (J1)of the IPA input power probe. The IPA inputpower probe is mounted on the interior sidepanel which is immediately behind the IPAmodule (see figure MD-2).

(e) Locate shielded wire #400, which is tied backnear the rear of the exciter and connect itbetween TB1-4 (conductor) and TB1-5 (shield)of the exciter's interface appropriate exciterinput PWB (A10).

(f) Connect the program input to the appropriateexciter input, as detailed in the exciter'stechnical instruction manual.

(g) Reinstall the transmitters upper, rear panel,ensuring the safety ground wire is reconnected.

2.2.8.2 Externally Mounted Exciter: When theexciter is located outside of the transmitter, make theelectrical interconnections as follows:

NOTEConnections between the exciter and the transmittershould enter the transmitter thru the same cableentry hole as the remote control lines.

(a) Obtain the 15 foot RF coaxial cable that isterminated by BNC connectors labelledW39P1/W39P2 from the ancillary parts kit andinstall it between the RF output connector ofthe exciter and the EXCITER I/P connector (J1)of the IPA input power probe. The IPA inputpower probe is mounted on the interior sidepanel which is immediately behind the IPAmodule (see figure MD-2).

(b) When applicable, interconnect the exciter's RFmute (safety interlock) control and thetransmitter's exciter interlock control, using asingle conductor shielded wire. The exciterinterlock control is available on the EXCITERINTERLOCK terminals of TB1 on thetransmitter's control/monitor PWB (A14).



NOTEA set of relay contacts are connected to TB1-15(COM), TB1-13 (N/O) and TB1-14 (N/C) as theexciter interlock control. The relay statusidentification on TB1-13 and TB1-14 does notreflect the energized/de-energized state of the relay,it represents the relay state when the exciter's RFoutput is not to be muted.

- When an open circuit is required for normaloperation and a contact closure is required tomute the exciter's RF output, connect theexciter interlock conductor to TB1-13 (N/O)and its shield to TB1-15 (COM).

- When an contact closure is required for normaloperation and an open circuit is required tomute the exciter's RF output, connect theexciter interlock conductor to TB1-14 (N/C)and its shield to TB1-15 (COM).

(c) Reinstall the transmitters upper, rear panel,ensuring the safety ground wire is reconnected.

2.2.9 RF OUTPUT ACCESS: Remove theprotective cover from the EIA flange connection onthe top of the cabinet (RF output) and the dowel fromits inner connector as follows:

(a) Remove the four 1/4-20 hex nuts securing theEIA flange connection's aluminum shippingcover. Retain hardware.

(b) Carefully withdraw aluminum shipping cover,noting it contains a dowel that is inserted in theEIA inner connector. Discard shipping cover.

(c) Obtain output plate assembly (P/N 182-6031)included in the shipment.

(d) Using the hardware retained from step (a),install the output plate assembly on the top ofthe RF output, noting that the studs of theassembly are to point upwards (refer to figureMD-11). Tighten hardware securely.

2.2.10 INSTALLATION OF RF FEEDCABLE: Connect an RF feed coaxial cable, that hasbeen cut to the required length, to the transmitter'sRF output; noting the RF feed cable termination pointis located at the top of the RF output filter (refer tofigure MD-15 for location and dimensionalinformation).

NOTEThe transmitter's RF output should be applied to adummy load during the commissioning procedure'sinitial turn-on. If the RF feed cable is not connectedto a switching circuit that permits antenna/dummyload selection, ensure the RF feed cable for thedummy load is connected to the transmitter's RFoutput connection until otherwise specified duringthe commissioning procedures.

2.2.10.1Connection of RF Feed Cable: Connectthe RF feed cable to the transmitter's RF output(3 1/8 EIA inch flange) connection as follows:

(a) Verify the RF feed cable is in place and hasbeen cut to the required length.

(b) Install a 3 1/8-inch EIA flange connector on thefeed cable.

NOTEIf the RF feed cable's EIA flange connector does nothave a male connector for the centre conductor, anEIA bullet for a 3 1/8 inch EIA flange connectormust be obtained.

(c) Locate and remove four 3/8 nuts and three 3/8-inch washers from the EIA flange connectormounting studs on the top of the RF powerprobe.

(d) Carefully install the RF feed cable's 3 1/8 inchEIA flange connector on the RF power probe'sflange mounting studs. Ensure its bullet mateswith the rigidly mounted cup connector on theRF power probe. Secure using attachinghardware removed in step (c). Ensure nuts arefirmly tightened.

2.2.11 REFERENCE GROUND INTER-CONNECTION: Connect a continuous, low-impedance conductor (0 AWG copper wire, two-inchcopper strap or equivalent), as described in Nautel's'Lightning Protection for Radio Transmitter Stations'booklet, between the station reference ground and theinsulated reference ground stud at the bottom rear ofthe cabinet.



Figure 2-1 External Input/Output Interface



WARNING

TECHNICAL PRE -COMMISSIONING2.3 Prior to applying AC power and turning onthe transmitter, some circuits must be customized tothe station's power source and operatingrequirements. The following should be completed.

NOTETechnical pre-commissioning procedures requiretechnical decisions and customization of electricalcircuits. They should be incorporated by the stationengineer or a competent electronic technician.

2.3.1 SELECTING PWR TRANSFORMER'SPRIMARY WINDING TAPS : Connect the wiresfrom the three-phase transformer's H1, H2 and H3terminals to the appropriate primary winding taps asfollows:

Ensure AC power source is switched off at theservice entrance. If this precaution is notobserved, voltages that may cause serious injury ordeath will be present on circuit breaker andtransformer terminals.

(a) Determine fully loaded, mean, RMS, line-to-line voltage of the AC power source and recordthis voltage for future reference.

(b) Verify the power transformer is rated for thevoltage determined in step (a) by noting voltagerating on its nameplate.

(c) Enter the appropriate nominal ac voltagecolumn of table 2-4 with the mean, RMS, line-to-line voltage obtained in step (a) anddetermine which primary winding taps shouldbe used.

(d) Gain access to the transformer's primarywinding taps by removing the screws securingthe lower rear panel to the cabinet. Carefullyset the panel to one side.

(e) Connect the moveable wire from each of thepower transformer's input terminals (H1, H2and H3) to the tap of its associated primarywinding identified in step (c) noting the tap forall three primary windings must be the same(A, B, C, D or E).

(f) Re-install the lower panel on the rear of thecabinet, using the attaching hardware removedin step (d).

2.3.2 SELECTING EXCITER INTERLOCKCONNECTIONS: Refer to exciter service manualand determine the required contact arrangement tomute the exciter's RF output, noting that:

- If an open circuit is required for normaloperation and a contact closure is required tomute the exciter's RF output, connect theexciter interlock wires between TB1-13(N/O)and TB1-15(COM) of the transmitter's control/monitor PWB (A14).

- If a contact closure is required for normaloperation and an open circuit is required tomute the exciter's RF output, connect theexciter interlock wires between TB1-14(N/C)and TB1-15(COM) of the transmitter's control/monitor PWB (A14).

2.3.3 LOAD RESISTANCE CHECK FORB+ VOLTAGE POWER SUPPLY: Check forshort circuits on the load of the B+ voltage powersupply as follows:

(a) Verify all PWR MDL circuit breakers are set toOFF.

(b) Measure load resistance for the B+ volts powersupply by connecting an ohmmeter between L1-2 of power supply assembly and ground. Repeat for L2-2. Refer to figure MD-2 andMD-3 to locate A1L1 and A1L2.

(c) Resistance reading obtained in step (b) shouldindicate an impedance of 10K ohms or greater.

NOTEThere are large storage capacitors in the main B+Volts power supply. Resistance readings will not beaccurate until they are fully charged to the voltagebeing applied by the ohmmeter.

2.3.4 CONTROL/MONITOR BATTERY : The control/monitor PWB's backup batteries shouldnot be installed until AC power is applied to thetransmitter. Refer to section 4 of this manual forcontrol/monitor battery installation procedure.



Table 2-4 Primary Winding Tap Selection for Three-Phase Power Transformer A1T1

NOMINAL AC VOLTAGE PRIMARY WINDING TAPS(RMS - PHASE-TO-PHASE)

208 VOLTS 380/415 VOLTS H1 H2 H3

193 - 203 351 - 369 1-A 2-A 3-A204 - 213 370 - 389 1-B 2-B 3-B214 - 223 390 - 410 1-C 2-C 3-C224 - 235 411 - 425 1-D 2-D 3-D236 - 248 426 - 448 1-E 2-E 3-E

NOTERefer to section 4 for pre-startup andcommissioning of this equipment.

unpacking and installation

Documents

transmitter sites

transmitter dimensions

transmitter clearances

transmitter roomrequirements

transmitter iscontributing

exhaust air

rf power module section

thetransmitter room