XL WATT AM BROADCAST TRANSMITTER

Transcription

1 INFORMATION SHEET PRE-INSTALLATION INFORMATION XL WATT AM BROADCAST TRANSMITTER Original Issue... Web: Nautel Maine Inc. Nautel Limited 201 Target Industrial Circle, Hackett s Cove, RR #1 Tantallon, Bangor, Maine USA Nova Scotia Canada B0J 3J0 Phone: (207) Phone: (902) Fax: (207) Fax: (902) ISO 9002 Registered ISO 9001 Registered Copyright 2002 NAUTEL. All rights reserved

2 PLANNING AND SITE PREPARATION 1 Transmitter sites Nautel's XL watt AM broadcast transmitters should be prepared to receive the transmitter prior to its delivery and/or installation. The following must be taken into consideration when preparing new sites. They should be used as the evaluating criteria at existing sites. It is recommended that all requirements are incorporated to ensure optimum reliability and permance is obtained. NOTE Frequent reference is made to terminal boards on the remote interface PWB, which is located on the rear of the control/monitor panel. Refer to figure 6 as an aid in locating the remote interface PWB. 1.1 TRANSMITTER ROOM REQUIREMENTS: The following transmitter room requirements must be addressed when the transmitter site is being finalized Transmitter Dimensions: Refer to figure 7 transmitter dimensions. These dimensions identify floor space requirements and will assist in determining cable lengths and routing Transmitter Clearances: A clearance of at least 1.3 metres (4.0 feet) should be maintained at the front and rear of the transmitter Air Flushing: Four fan trays pull cooling air through an air filter in the cabinet's rear door. It is circulated through the RF power modules and exhausted as a low velocity stream through openings in the top of the cabinet Cooling: The transmitter room's ambient air temperature must not exceed 50 C. A room air exchange rate of 1000 CFM should achieve an acceptable intake/exhaust temperature rise. For air conditioning requirements, it can be assumed 16% of the power being consumed, from the AC power source, is converted to waste heat. NOTE A simple method of determining the number of British thermal units (BTU's) per hour being generated as waste heat is to multiply the average RF output power (in watts) by (waste heat factor) and then multiply the product by (watts/btu factor). As an example: At watts carrier power with 50% modulation, the average power output is watts. This represents an average long-term output power based on typical processed program material. At 84% overall efficiency, the waste heat generated ( x ) is 2570 watts which equals (2570 x 3.413) 8776 BTU's per hour. Since BTU's per hour requires one ton of air conditioning in a closed system, if the example was in a closed system, it would require a 0.75-ton air conditioner to remove the waste heat Heating: The transmitter room must contain a heating system that will ensure its ambient air temperature does not go below 0 C Work Area: It is recommended that a suitable work area with an adequate table surface be provided adjacent to the transmitter to permit bench adjustment/repair of modules. 1.2 LIGHTNING PROTECTION: Extremely high voltage/current transients are produced when a lightning strike occurs. These transients, which are probably the most significant hazard to any solid state transmitter, may be passed to the transmitter through the wiring connecting it to its power source and its antenna system. It is imperative all practical precautions be taken to protect the transmitter from this phenomenon. Refer to Nautel's Recommendations Transmitter Site Preparation booklet recommendations and specific protection techniques. The following requirements are considered to be essential. IS02009 (Page 1)

3 1.2.1 Station Reference Ground: The site must contain a station reference ground, as defined in Nautel's Recommendations Transmitter Site Preparation booklet. This ground must provide a continuous, low impedance path to the earth. The transmitter cabinet's designated reference ground point, the shield of the coaxial feed cable and the ground connection of the power source's surge protection devices must be connected directly to the station reference ground AC Power Source: All conductors from the AC power source should be protected by bi-directional surge protection devices that are connected between each conductor and the station reference ground. In addition, the conductors should pass, as a group, through a ferrite toroid. The inductance med by this toroid will be transparent to the AC voltages but will present impedance to transients originating in the power source. A surge protector panel, which contains suitably rated varistors is available from Nautel this purpose. If used, the surge protector panel should be installed in close proximity to the station reference ground. NOTE The AC power source usually presents the lowest impedance path to ground potential a lightning strike and will normally carry most of the lightning induced current away from the transmitter site. When lightning hits the power source, a significant amount of induced current may flow towards the transmitter. In this instance, the objective is to route the current around the transmitter, instead of through it, to the best ground available Antenna Feed Cable: The shield of the antenna feed coaxial cable should be connected directly to the station reference ground where it enters the building. In addition, the centre conductor and the shield of the feed cable should pass through a ferrite toroid which is positioned between the shield ground, at the building entrance and the shield termination, at the transmitter reference ground. This toroid will be transparent to the RF signal, but will present impedance to transients originating in the antenna Antenna/RF Output Disconnect: A switching circuit that disconnects the antenna from the transmitter's RF output when the transmitter is turned off should be incorporated into the RF feed/ antenna design. This switching circuit will prevent lightning-induced transients from entering the transmitter when its solid state devices are most susceptible to electrostatic failure Antenna Tower: The antenna tower is the most likely target lightning strikes. It is imperative that it contain lightning protection devices, such as air-gap spark balls, as the first line of defence against lightning strikes External Control/Monitor Wiring: All external/control wiring, that may be subjected to lightning induced transients, should be interfaced to the station reference ground by surge protection devices where they enter the building. All conductors and their shields should pass through a ferrite toroid that is positioned between its surge protection device and the transmitter. This toroid will be transparent to control/monitor signals, but will present impedance to lightning induced transients. 1.3 ELECTRICAL POWER: The transmitter is configured during manufacture to operate from one of a variety of 50/60 Hz AC power sources. The purchaser specifies the option selected. The preferred option is a three-phase, four-wire, wye connected, AC power source meeting all of the following requirements: Nominal Voltage: The primary winding of the main AC power transmer contains taps to accommodate voltages that differ from the ideal voltage of the power source. These taps represent five-percent increments and are selected during installation to provide the optimum nominal voltage the transmitter Voltage Stability: The AC power source's nominal voltage must be stable to within plus or minus ten percent under all loading conditions. The transmitter contains circuitry that maintains the RF output at the pre-set carrier level voltage variations within this range. IS02009 (Page 2)

4 1.3.3 Power Consumption: When operating at 12kW with 100% modulation by a continuous sine wave, power consumption is 21.43kW. When operating at 12kW and no modulation, power consumption is 14.29kW. Power consumption a specific station will depend on the programming mat and the level of audio processing. The AC power source should have a twenty-five percent overcapacity to ensure adequate regulation External AC Switching: An external AC input switch is provided as the master on/off circuit between the AC power source and the transmitter. When the contract calls a key-controlled safety interlock system that meets the requirement of the International Electrotechnical Commission specification IEC215, clause 13, the AC input switch will contain a key-controlled dead bolt that ms part of a mechanical safety interlock system (refer to paragraph 1.7.3). The AC input switch should be located close to the transmitter and it should be marked TRANSMITTER EMERGENCY ON/OFF SWITCH. 1.4 ANTENNA SYSTEM: It is recommended that the antenna system meets (as a minimum) the standards specified in EIA Standard TR-101-A, paragraph 8(b) with a normal impedance of 50 ± j0 ohms at the carrier frequency. The transmitter will function while operating into a maximum VSWR of 1.5:1, or with sideband VSWR of up to 2:1 when the carrier frequency impedance is 50 ± j0 ohms, but overall system permance will be degraded RF Feed Cable: The RF feed cable interconnecting the transmitter and the antenna system should be a suitably rated coaxial cable. Unless otherwise specified in contract documents, the transmitter's RF output device will accept a 1 5/8- inch EIA flange connector. The RF feed cable's transmitter end must be terminated by an appropriate mating connector. 1.5 EXTERNAL RF DRIVE SOURCE: There is provision to apply an externally generated RF drive to a BNC coaxial connector on the exciter interface PWB. It can be used in lieu of the integral carrier oscillator one or both exciters. NOTE There is only one external RF drive input. If it is used both exciters, it is recommended the RF drive source be duplicated (main/standby). An automatic changeover circuit should be incorporated to select the standby source when the main source fails The external RF drive must: - be the carrier frequency (ƒc), within ±5 Hz or 5 parts per million (ppm) whichever is greater, when it is not being modulated. - have a peak-to-peak amplitude of between 5.0 and 12 volts (sine wave or square wave). - have a 50-ohm impedance at ƒc. 1.6 MODULATING AUDIO: Modulating audio must be applied from an external source. When both exciters are configured monaural operation there is provision a single audio source (common to both exciters), or two audio sources (one each exciter) regardless of the source the RF drive. An audio source selector switch on the exciter interface PWB is set during installation to ensure the audio routing is correct. In both cases the audio must: - be a balanced 600 ohms. - have a level which is between 0dBm and +12dBm (factory set to 10dBm) 100% modulation. NOTE The transmitter does not have audio processing capability. Processing must be completed bee the audio is applied. For monaural applications, the audio may be processed to provide 145% positive peak program modulation at watts RF carrier A single audio source must be connected between TB2-8 (+) and TB2-9 (-) of the remote interface PWB. The exciter interface PWB s AUDIO SOURCE switch must be set to SINGLE When two audio sources are used, they are both connected to terminals on the remote interface PWB. Exciter A s audio must be connected between TB2-8 (+) and TB2-9 (-). Exciter B s audio must be IS02009 (Page 3)

5 connected between TB2-11 (+) and TB2-12 (-). The exciter interface PWB s AUDIO SOURCE switch must be set to DUAL. 1.7 SAFETY INTERLOCKS: There are three types of safety interlocks, one mechanical and two electrical. The mechanical interlock, which is optional, is a key controlled system that locks the rear door and prevents access to areas with high voltages when AC power is being applied. One of the electrical interlocks is an external circuit that inhibits the RF output if any of its serially connected switches is opened. The second electrical interlock is an internal circuit that prevents the RF output from being enabled if the ground wand has not been returned to its retaining clips after use OR if the rear panel/door is open/removed External Electrical Interlock: The external electrical interlock circuit is connected between two terminals on the remote interface PWB. When it is safe to produce an RF output, the circuit must be intact and apply a contact closure between the terminals. When it is not safe to produce an RF output (one or more of the external interlock switches have been activated), the circuit must provide an open circuit between the terminals. Any number of serial interlock switches may be installed, provided an open circuit is presented between the interlock terminals if any interlock switch is activated. NOTE If external wiring is lengthy, unwanted transients may be induced on the 24V source. If this occurs, a user supplied relay - with its energized/de-energized state controlled by the external interlock switches - should be installed near the remote interface PWB. It should be connected as a fail-safe relay (energized when the interlock circuit is intact, de-energized when it is opened) with its normally open contacts interconnecting the interlock terminals Mechanical Safety Interlock (Optional): The mechanical safety interlock system, which meets the requirements of International Electrotechnical Commission Specification IEC215, clause 13, can be provided. It consists of two key-controlled dead bolts (one on the circuit breaker enclosure and the second on the rear door of the cabinet) with a single key that is common to both When the key is inserted in the AC input switch's dead bolt lock: - The AC input switch may be turned on. - If the switch is turned on, the key is latched and may not be removed. - The cabinet's rear door is locked and access to high voltage areas is not possible When the key is inserted in the rear door's dead bolt lock: - The AC input switch is tuned off and it may not be inadvertently turned on. - Access to areas that contain high voltage is possible by unlocking and opening the door. - If the rear door is not closed and locked, the key is latched and may not be removed. 1.8 REMOTE CONTROL CIRCUITS: The on/off status, active (A/B) exciter, pre-set RF power level, power level adjustment, alarm recall and system alarm reset can be controlled remotely, by switching circuits that comply with the following: Internal Electrical Interlock: The internal electrical interlock prevents the RF output from being enabled when the ground wand is not properly stored in its retaining clips. IS02009 (Page 4)

6 Figure 1 - Single Ended Input Selected NOTE External control circuits are interfaced to the transmitter circuits through opto-couplers on the remote interface PWB. The opto-couplers effectively buffer/isolate the external circuits and prevent any unwanted transients from affecting transmitter operation. They only have influence when REMOTE control is selected at the transmitter. The remote interface PWB contains selection circuits that allow the user to select an internal (single ended input) or external (differential input) DC power supply as the current source the optocoupler associated with each controlled function. The switching circuit each remotely controlled function must be the equivalent of a normally open/held closed spring-loaded (momentary) switch. Each must be configured to operate as a single ended input using the transmitter's unregulated +24V as the DC volts source (see figure 1) or as a differential input using an external DC power supply (24-30V) as the DC volts source (see figure 2). Each control function has positive and negative input terminals, on the remote interface PWB, to accommodate the selected configuration. Single Ended Input (Internal VDC): When the transmitter's unregulated +24V is to be used as the current source a control function's opto-coupler, the control function's external switching circuit and the remote interface PWB's selection circuitry must be configured a single ended input (figure 1). A negative logic (active state is a current-sink-toground) command must be applied to the control's negative (-) input terminal. The ground source must be obtained from the remote interface PWB. Figure 2 - Differential Input Selected Differential Input (External VDC): When an external DC voltage (24 to 30V) is to be used as the current source a control function's opto-coupler, the control function's external switching circuit and the remote interface PWB's selection circuitry must be configured a differential input (figure 2). The normally open/held closed switch may be located between the DC voltage's negative output and the negative (-) input terminal (negative logic) or between its positive output and the positive (+) input terminal (positive logic) On/Off Control: The remote on/off circuitry controls the on/off status of the RF power stage. It comprises an on circuit and an off circuit. Each must be configured a single ended input (see figure 1) or a differential input (see figure 2). RF PWR ON terminals are TB1-1 (+) and TB1-2 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E1. RF PWR OFF terminals are TB1-3 (+) and TB1-4 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E Main Exciter Selection: The main exciter selection circuit selects which exciter will be enabled as the main exciter. It comprises an A and a B circuit. Each must be configured a single ended input (see figure 1) or a differential input (see figure 2). The EXCITER A input terminals are TB1-5 (+) and TB1-6 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E3. IS02009 (Page 5)

7 IS02009 (Page 6)

8 The EXCITER B input terminals are TB1-7 (+) and TB1-8 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E4. NOTE There must be a minimum one-second interval between exciter selection commands Pre-set Power Level Selection: The power level selection circuit selects one of six pre-set RF power levels. It has six switching circuits (RF Pwr - 1, 2, 3, 4, 5 and 6). Each must be configured a single ended input (see figure 1) or a differential input (see figure 2). RF PWR 1 terminals are TB1-9 (+) and TB1-10 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E5. RF PWR 2 terminals are TB1-11 (+) and TB1-12 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E6. RF PWR 3 terminals are TB1-13 (+) and TB1-14 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E7. RF PWR 4 terminals are TB1-15 (+) and TB1-16 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E8. RF PWR 5 terminals are TB1-17 (+) and TB1-18 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E9. RF PWR 6 terminals are TB1-19 (+) and TB1-20 (-) and the associated 3-pin header/2-socket shunt post on the remote interface PWB is E Power Level Adjust Select: The power level adjust circuit controls a dynamic circuit that slews the RF output level in an increasing or decreasing direction as long as the appropriate input is active. It comprises an increase and a decrease circuit. Each must be configured a single ended input (see figure 1) or a differential input (see figure 2). INCR RF PWR terminals are TB1-21 (+) and TB1-22 (- ). The associated 3-pin header/2-socket shunt post on the remote interface PWB is E11. DECR RF PWR terminals are TB1-23 (+) and TB1-24 ( ). The associated 3-pin header/2-socket shunt post on the remote interface PWB is E System Reset: The system reset circuit generates reset pulses that are applied to the AC/DC power, exciter and RF power stages. It also resets any alarm circuit that is/was latched in its alarm state. It must be configured to be controlled by a single ended input (see figure 1) or by a differential input (see figure 2). The SYSTEM RESET terminals are TB2-1 (+) and TB2-2 (-). The associated 3-pin header/2-socket shunt post on the remote interface PWB is E Alarm Recall: The alarm recall circuit allows the user to reinstate an active remote alarm condition any alarm(s) that caused the last RF shutback and is not currently being displayed or affecting the RF output. It must be configured to be controlled by a single ended input (see figure 1) or by a differential input (see figure 2). The ALARM RECALL terminals are TB2-3 (+) and TB2-4 (-). The associated 3-pin header/2-socket shunt post on the remote interface PWB is E OTHER REMOTE CONTROLS: An RF inhibit control can be connected, at the user's discretion. This input will influence the transmitter's RF output regardless of the selected control location (LOCAL or REMOTE) External PDM (RF) Inhibit Control: The external PDM inhibit circuit reduces the 'on' time of the PDM signal to near zero, effectively turning off the RF output (a residual RF leak of approximately 10 watts may be present) the instant an active condition is applied. This state is maintained as long as the active condition exists. It must be configured to be controlled by a single ended input (see figure 1) or by a differential input (see figure 2). PDM INHIBIT terminals are TB2-5 (+) and TB2-6 (-). The associated 3-pin header/2-socket shunt post on the remote interface PWB is E15. IS02009 (Page 7)

9 NOTE The external PDM inhibit input is intended to be used in conjunction with antenna switching circuitry to ensure minimal RF output current flows during opening/closing of contacts in the transmitter's RF feed cable. An active 'PDM inhibit' condition must be applied prior to contact opening (disconnecting the RF load) and must be maintained until contact closure has occurred and an appropriate impedance has been connected to the transmitter's RF output. The RF output will be instantly restored to its original level when the active condition is removed RF PERFORMANCE MONITORING: The transmitter provides outputs to monitor RF permance. They include DC voltages which are representative of the ward power level, the reflected power level and the DC voltage being applied to the RF amplifiers. In addition, a true RF sample of the RF output's voltage wavem is available external monitoring. These outputs are available on the remote interface PWB RF Monitor Sample: A true sample of the RF output's voltage wavem, including its modulation envelope, is provided at a BNC connector (RF MONITOR) on the remote interface PWB. The RF monitor output is intended application to a station modulation monitor with a 50-ohm input impedance. It may also be monitored by an oscilloscope during maintenance procedures. The RF monitor output can be set to provide 5.0V RMS each pre-set power level, provided the power levels are pre-set to a level between 1000 and watts Forward Power Level: A buffered DC voltage that is representative of the ward power level is available on TB4-1 (BFRD FWD PWR) [TB4-2 (GND) is the return path]. This voltage is a non-linear (square law) function and will be 13.7 ±0.5V when the ward power is watts. The impedance of the monitor circuit must be greater than 1000 ohms. the monitor circuit must be greater than 1000 ohms Power Amplifier Volts: A buffered DC voltage that is directly proportional to the DC voltage being applied to the RF amplifiers in the RF power modules is available on TB4-5 (BFRD PA VOLTS) [TB4-4 (GND) is the return path]. This voltage will be 2.85V when the DC voltage being applied to the RF amplifiers is 129V. The impedance of the monitoring circuit must be greater than 1000 ohms REMOTE ALARM INDICATIONS: Outputs that indicate stress thresholds critical parameters have been exceeded are available on terminals of the remote interface PWB. A switching device each alarm output provides a negative logic (current-sink-to-ground) output an alarm condition. There are two options available the non-alarm condition. Outputs are protected against transients and over voltage by 39V zener diodes. Option 1: The switching circuit provides an open collector during normal operation (no alarm) and has no influence on the external monitoring circuit. For this option, resistor arrays U11 through U14 are not installed on the remote interface PWB and each monitoring circuit must present an impedance, between the switching device and a positive DC voltage source, that will result in a current flow of not more than 50 ma. If desired, +24V is available use by the remote monitoring circuits from TB1-26 (+24V INTLK) of the remote interface PWB. If an external DC power source is used, it must not exceed +24V and its return must be connected to TB1-27 (GND) on the remote interface PWB. Option 2: The switching circuits provide a TTL compatible output. +5V is applied to the alarm output terminal as the logic '0' state (non-alarm condition) and a current sink to ground is applied as the logic '1' state (alarm condition). For this option, resistor arrays U11 through U14 must be installed on the remote interface PWB and the DC return the monitor circuits must be connected to TB1-27 (GND) on the remote interface PWB Reflected Power Level: A buffered DC voltage that is representative of the reflected power level is available on TB4-3 (BFRD REFLD PWR) [TB4-2 (GND) is the return path]. This voltage is a non-linear (square law) function and will be 5.25 ±0.5V when the reflected power is 1500 watts. The impedance of IS02009 (Page 8) RF Stress Current Alarm: An alarm output that indicates the RF output is being cutback, because the RF output current is exceeding the maximum current the RF power modules can provide, is available on TB2-24 (RF OVER CURRENT). A negative logic output (current-sink-to-ground) will be present an alarm condition.

10 Filter Over Temp Alarm: An alarm output that indicates the RF output is being inhibited, because the ambient air temperature in the RF output filter is in excess of 85 C, is available on TB2-22 (FILTER OVER TEMP). A negative logic output (current-sink-to-ground) will be present an alarm condition High Reflected Power Alarm: An alarm output that indicates the peak reflected power is exceeding or has exceeded 2000 watts is available on TB2-26 (HIGH VSWR). A negative logic output (current-sink-to-ground) will be present an alarm condition RF Power Cutback Alarm: An alarm output that indicates the RF carrier level has been automatically reduced (cut back) to a level that will not exceed the stress current threshold of the RF power amplifiers. Cutback occurs when the RF output is momentarily shut back (turned off) more than three times in any five second period because an RF related stress threshold was exceeded. This output is available on TB2-27 (RF PWR CUTBACK). A negative logic output (current-sink-to-ground) will be present an alarm condition RF Inhibit Alarm: An alarm output that indicates the RF output is being inhibited, because an active external RF inhibit command is being applied to the PDM INHIBIT terminals (TB2-5 or TB2-6), is available on TB3-1 (INHIBIT PDM EXT). A negative logic output (current-sink-to-ground) will be present an alarm condition Standby Exciter Alarm: An alarm output that indicates an automatic exciter changeover has occurred and the reserve (standby) exciter is enabled as the pulse duration modulation (PDM)/RF drive source, is available on TB3-2 (STANDBY). A negative logic output (current-sink-to-ground) will be present an alarm condition Modulation Protection Alarm: An alarm output that indicates the modulating audio's positive peaks are being limited; because their amplitude and/or low frequency duration would require RF currents that exceed the RF amplifier's stress current threshold, is available on TB3-3 (MODULATOR PROTECTION). A negative logic output (current-sinkto-ground) will be present an alarm condition Power Module Fault Alarm: An alarm output that indicates the RF output has been reduced, because one more RF power modules have been turned off and are not contributing to the RF output, is available on TB3-4 (PM FAULT). A negative logic output (current-sink-to-ground) will be present an alarm condition B+ Power Supply Fault Alarm: An alarm output that indicates the RF output has been inhibited, because the output of the B+ DC power supply is not within 10% of its optimum voltage (over or under) is available on TB3-5 (B+ P/S FAIL). A negative logic output (current-sink-to-ground) will be present an alarm condition AC Fail Alarm: An alarm output that indicates the RF output has been inhibited; because the voltage from the AC power source is more than ten percent below the ideal voltage the power transmer's selected primary winding taps, or a loss of phase has occurred; is available on TB3-6 (AC FAIL). A negative logic output (current-sink-toground) will be present an alarm condition Power Supply Over Temp Alarm: An alarm output that indicates the RF output has been inhibited, because the sensed temperature in the AC/DC power supply compartment is in excess of 85 C, is available on TB3-7 (P/S OVER TEMP). A negative logic output (current-sink-to-ground) will be present an alarm condition Battery Low Alarm: An alarm output that indicates the charge status of the batteries on the system control PWB has decayed to less than 4.0V and they should be replaced, is available on TB3-9 (BATTERY LOW). A negative logic output (currentsink-to-ground) will be present an alarm condition External Interlock Alarm: An alarm output that indicates the RF output is being inhibited, because one or more of the external interlock switches has been opened, is available on TB3-10 (EXT INTLK OPEN). A negative logic output (currentsink-to-ground) will be present an alarm condition. IS02009 (Page 9)

11 Internal Interlock Alarm: An alarm output that indicates the RF output is being inhibited, because the transmitter's ground wand is not properly stored in its retaining clip OR a rear access door/panel is not secure, is available on TB3-11 (INT INTLK OPEN). A negative logic output (current-sink-toground) will be present an alarm condition RF Power Shutback Alarm: An alarm output that indicates the RF output is being inhibited (shut back), because a protection circuit threshold has been exceeded, is available on TB5-1 (RF PWR CUTBACK). A negative logic output (current-sink-toground) will be present an alarm condition RF Drive B+ Fail Alarm: An alarm output that indicates the RF output has been inhibited, because the output of the RF drive amplifier's B+ DC power supply is less than 56V, is available on TB5-2 (RF DR B+ FAIL). A negative logic output (current-sink-to-ground) will be present an alarm condition PDM Failure Alarm: An alarm output that indicates the RF output has been inhibited, because one or both of the pulse duration modulation (PDM) outputs from the active interphase PDM driver PWB has failed, is available on TB5-3 (PDM FAIL). A negative logic output (current-sink-toground) will be present an alarm condition RF Drive Fail Alarm: An alarm output that indicates the RF output has been inhibited, because the peak-to-peak voltage of the RF drive being applied to the FETs in the RF amplifiers of the RF power module is less than 17.5 volts peak-topeak, is available on TB5-4 (RF DRIVE FAIL). A negative logic output (current-sink-to-ground) will be present an alarm condition Low DC Volts Fail Alarm: An alarm output that indicates the RF output has been inhibited, because the output of one of the low voltage DC power supplies (+8V, +5V, -5V, +15V or -15V) has failed, is available on TB5-5 (LV P/S FAIL). A negative logic output (current-sink-toground) will be present an alarm condition. PARTS SUPPLIED BY NAUTEL 2 The following parts/materials are supplied by or are available from Nautel. 2.1 ANCILLARY PARTS: An ancillary parts kit is provided with each transmitter. These parts are provided to ensure initial installation is not delayed because of a lost or damaged part and to allow the user to maintain the equipment until a comprehensive maintenance spares kit is obtained. They are not intended to be long-term maintenance spares. Detailed inmation about these parts is not included in this manual. The ancillary parts kit contents is itemized in its packing list. PARTS REQUIRED BUT NOT SUPPLIED 3 Some parts and materials required to complete an installation are not supplied with the transmitter or are not provided by Nautel. The user must supply these parts. Each installation will dictate the parts required, and will normally include the following: - A suitable 50-ohm RF output coaxial cable, terminated by a 1 5/8 inch EIA connector complete with centre male connector at the transmitter end, is required. - All external control/monitor wiring, including their associated terminating devices and conduit clamps must be provided by the user. - All electrical power cables, including conduit, terminating devices and conduit clamps must be provided by the user. 3.1 Surge Protector Panel: A surge protector panel that is rated the AC power source to be applied to the transmitter is available from Nautel. The surge protector panel will help protect the transmitter against lightning-induced voltage transients on the AC power source and/or the antenna system. TEST EQUIPMENT AND SPECIAL TOOLS 4 The test equipment required to install and maintain the transmitter is listed in table 1 and the special tools are listed in table 2. IS02009 (Page 10)

12 Table 1 Test Equipment NOMENCLATURE PART, MODEL, OR TYPE NUMBER APPLICATION (EQUIVALENTS MAY BE USED) Dummy Load Digital Multimeter 50 ohms, 20,000 Watts (minimum) VSWR /2 digit, AC and DC volts (10M ohms input), ohms and amps, ±0.5% accuracy, Beckman 3010 'off-air' testing testing and maintenance Frequency Counter 5ppm up to 10 MHz Fluke Model 1900A measure carrier frequency Oscilloscope Tektronix Model T922 testing and maintenance Modulation Monitor 50-ohm input impedance, -100% to +125% mod depth TFT Model 375 to set up audio level Audio Signal Generator 10 Hz to 10 MHz, 600 ohms, 0dBm to +15dBm Hewlett Packard model 651B simulates modulating audio input during testing and maintenance Distortion Analyzer 20 Hz to 20 khz Marconi Model TF231 measures audio distortion during testing and maintenance Table 2 Special Tools NOMENCLATURE PART, MODEL, OR TYPE NUMBER APPLICATION (EQUIVALENTS MAY BE USED) Torque Wrench Capable of torquing to five inch-pounds (0.665 Newton-Meters) Installing power MOSFETs HEX Wrench 5/32" or 4 mm Terminating wires on AC breaker Screwdriver HAZ79 (located in ancillary parts kit) Tuning RF drive IS02009 (Page 11)

13 Figure 3 External Input/Output Interface IS02009 (Page 12)

14 Figure 4 Assembly Detail - XL W AM Broadcast Transmitter (Top and Front) IS02009 (Page 12)

15 Figure 5 Assembly Detail - XL W AM Broadcast Transmitter (Rear and Sides) IS02009 (Page 13)

16 Figure 6 Assembly Detail NAC101 Control/Monitor Panel IS02009 (Page 14)

17 Figure 7 Dimensional Inmation - XL W AM Broadcast Transmitter IS02009 (Page 15)

18 Figure 8 Assembly Detail - NAX165/01 & NAX165/02 Circuit Breaker Enclosure (meets IEC215) IS02009 (Page 16)