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Nautel XL12 Technical Instructions

Manual is about: AM BROACAST TRANSMITTER 12 000 WATT SIX PRESET POWER LEVELS

Summary of XL12

  • Page 1

    E-mail: support@nautel.Com web: www.Nautel.Com nautel maine inc. Nautel limited 201 target industrial circle, hackett’s cove, rr #1 tantallon, bangor, maine usa 04401 nova scotia canada b0j 3j0 phone: (207) 947-8200 phone: (902) 823-3900 fax: (207) 947-3693 fax: (902) 823-3183 iso 9002 registered is...

  • Page 2

    12 000 watt am broadcast transmitter xl12 effective pages (page 1) 15 january 2002 list of effective pages the list of effective pages lists the status of all pages in this manual. Original pages are identified by a zero in the change no. Column. Pages subsequently changed are identified by the date...

  • Page 3

    12 000 watt am broadcast transmitter xl12 effective pages (page 2) 15 january 2002 list of effective pages (continued) change change page no. Date page no. Date 3-1 0 01 january 2002 3-2 0 01 january 2002 3-3 0 01 january 2002 3-4 0 01 january 2002 3-5 0 01 january 2002 3-6 0 01 january 2002 3-7 0 0...

  • Page 4

    12 000 watt am broadcast transmitter xl12 effective pages (page 3) 15 january 2002 list of effective pages (continued ) change change page no. Date page no. Date 8-17 0 01 january 2002 8-18 0 01 january 2002 8-19 0 01 january 2002 8-20 0 01 january 2002 8-21 0 01 january 2002 8-22 0 01 january 2002 ...

  • Page 5

    12 000 watt fm broadcast transmitter xl12 safety (page 1) 01 january 2002 artificial respiration (mouth-to-mouth) (a) start mouth-to-mouth breathing immediately. Seconds count. Do not wait to loosen clothing, warm the casualty, or apply stimulants. (b) assess responsiveness of casualty. Do not jar c...

  • Page 6

    12 000 watt fm broadcast transmitter xl12 safety (page 2) 01 january 2002 general rules for treatment for burns, bleeding, and shock 1. After casualty has revived, treat for injuries and shock. 2. Reassure casualty. 3. Try to make him comfortable. 4. Keep him reasonably warm but do not apply heat. 5...

  • Page 7

    12 000 watt fm broadcast transmitter xl12 safety (page 3) 01 january 2002 electric shock - rescue methods electricity can damage the body in a number of ways. It may interfere with the proper functioning of the nervous system and the heart action, it can subject the body to extreme heat and can caus...

  • Page 8

    12 000 watt am broadcast transmitter xl12 warranty (page 1) 01 january 2002 warranty nautel limited/nautel maine incorporated, hereinafter referred to as nautel, guarantees all mechanical and electrical parts of the equipment for a period of thirteen months from date of shipment. 1. A "part failure"...

  • Page 9

    12 000 watt am broadcast transmitter xl12 warranty (page 2) 01 january 2002 factory support technical assistance nautel's field service department provides telephone technical assistance on a 24 hour, seven days a week basis. Requests by other media (facsimile or e-mail) will be responded to the nex...

  • Page 10

    12 000 watt am broadcast transmitter xl12 contents (page 1) 01 january 2002 table of contents section page 1 general information 1.1 introduction ...................................................................................................... 1-1 1.2 factory support...............................

  • Page 11

    12 000 watt am broadcast transmitter xl12 contents (page 2) 01 january 2002 table of contents (continued) section page 2 installation (continued) 2.1.8.4 power level adjust select................................................................................... 2-6 2.1.8.5 system reset ...............

  • Page 12

    12 000 watt am broadcast transmitter xl12 contents (page 3) 01 january 2002 table of contents (continued) section page 2 installation (continued) 2.2.6.1 installation of reference ground stud................................................................. 2-14 2.2.6.2 installation of fan trays .......

  • Page 13

    12 000 watt am broadcast transmitter xl12 contents (page 4) 01 january 2002 table of contents (continued) section 2 installation (continued) 2.4.5.1 rf power checks ............................................................................................ 2-30 2.4.5.2 setting preset rf power level...

  • Page 14

    12 000 watt am broadcast transmitter xl12 contents (page 5) 01 january 2002 table of contents (continued) section 4 operating instruction (continued) 4.9.1.2 exciter 'b' active ................................................................................................ 4-4 4.9.1.3 exciter assemb...

  • Page 15

    12 000 watt am broadcast transmitter xl12 contents (page 6) 01 january 2002 table of contents (continued) section 5 system level trouble shooting (continued) 5.5.8 low voltage power supply - rf drive amp alarm ..................................... 5-5 5.5.9 low voltage power supply - battery low ala...

  • Page 16

    12 000 watt am broadcast transmitter xl12 contents (page 7) 01 january 2002 table of contents (continued) section 6 theory of operation (continued) 6.4 rf drive stage.................................................................................................... 6-4 6.4.1 regulated power supplie...

  • Page 17

    12 000 watt am broadcast transmitter xl12 contents (page 8) 01 january 2002 table of contents (continued) section 6 theory of operation (continued) 6.6.14.8 filter temperature alarm................................................................................... 6-10 6.6.14.9 power supply temperat...

  • Page 18

    12 000 watt am broadcast transmitter xl12 contents (page 9) 01 january 2002 table of contents (continued) section 8 parts list 8.1 introduction ...................................................................................................... 8-1 8.2 family tree ....................................

  • Page 19

    12 000 watt am broadcast transmitter xl12 contents (page 10) 01 january 2002 list of illustrations number title page 2-1 single ended input selected.................................................................................................. 2-5 2-2 differential input selected.....................

  • Page 20

    12 000 watt am broadcast transmitter xl12 contents (page 11) 01 january 2002 list of illustrations (continued) number title page sd-1 electrical schematic - xl12 - 12 000 watt am broadcast transmitter.................................... Sd-1 sd-2 electrical schematic - exciter stage....................

  • Page 21

    12 000 watt am broadcast transmitter xl12 contents (page 12) 01 january 2002 list of tables number title page 1-1 test equipment .................................................................................................................... 1-2 1-2 special tools ...................................

  • Page 22

    12 000 watt am broadcast transmitter xl12 page 1-1 01 january 2002 section 1 general information introduction 1.1 the xl12 am broadcast transmitter system is a totally solid state, medium wave, amplitude modulated, broadcast transmitter system. It may be operated as a monaural or an am stereo transm...

  • Page 23

    12 000 watt am broadcast transmitter xl12 page 1-2 01 january 2002 table 1-1 test equipment nomenclature part, model, or type number application (equivalents may be used) dummy load 50 ohms, 20,000 watts (minimum) vswr 1.1 'off-air' testing digital multimeter 3 1/2 digit, ac and dc volts (10m ohms i...

  • Page 24

    12 000 watt am broadcast transmitter xl12 page 1-3 01 january 2002 table 1-2 special tools nomenclature part, model, or type number application (equivalents may be used) torque wrench capable of torquing to four inch-pounds (0.532 newton-meters) installing power mosfets hex wrench 5/32" or 4 mm term...

  • Page 25

    12 000 watt am broadcast transmitter xl12 page 2-1 01 january 2002 section 2 installation planning and site preparation 2.1 transmitter sites for nautel's xl12 - 12 000 watt am broadcast transmitters should be prepared to receive the transmitter prior to its delivery and/or installation. The followi...

  • Page 26

    12 000 watt am broadcast transmitter xl12 page 2-2 01 january 2002 2.1.2.1 station reference ground: the site must contain a station reference ground, as defined in nautel's lightning protection for radio transmitter stations booklet. This ground must provide a continuous, low impedance path to the ...

  • Page 27

    12 000 watt am broadcast transmitter xl12 page 2-3 01 january 2002 2.1.3.3 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 for a specific ...

  • Page 28

    12 000 watt am broadcast transmitter xl12 page 2-4 01 january 2002 2.1.6.1.2 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 connected between tb2-11(+) and...

  • Page 29

    12 000 watt am broadcast transmitter xl12 page 2-5 01 january 2002 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...

  • Page 30

    12 000 watt am broadcast transmitter xl12 page 2-6 01 january 2002 figure 2-2 differential input selected differential input (external vdc): when an external dc voltage (24 to 30v) is to be used as the current source for a control function's opto coupler, the control function's external switching ci...

  • Page 31

    12 000 watt am broadcast transmitter xl12 page 2-7 01 january 2002 2.1.8.5 system reset: the system reset circuit generates reset pulses which 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 t...

  • Page 32

    12 000 watt am broadcast transmitter xl12 page 2-8 01 january 2002 2.1.11 remote alarm indications: outputs that indicate stress thresholds for critical parameters have been exceeded are available on terminals of the remote interface pwb. A switching device for each alarm output provides a negative ...

  • Page 33

    12 000 watt am broadcast transmitter xl12 page 2-9 01 january 2002 2.1.11.9 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...

  • Page 34

    12 000 watt am broadcast transmitter xl12 page 2-10 01 january 2002 2.1.12 remote status indications: outputs that indicate the status of operator controlled circuits are available on terminals of tb2 on the remote interface pwb. A switching device for each alarm output provides a negative logic (cu...

  • Page 35

    12 000 watt am broadcast transmitter xl12 page 2-11 01 january 2002 2.1.13.1 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 equip...

  • Page 36

    12 000 watt am broadcast transmitter xl12 page 2-12 01 january 2002 non-technical pre-commissioning 2.2 on delivery of the transmitter, the following non-technical procedures should be observed and completed. Note non-technical procedures are defined as being those procedures that do not require tec...

  • Page 37

    12 000 watt am broadcast transmitter xl12 page 2-13 01 january 2002 (c) ensure the cabinet's front edges are flush with a straight line representing the front of the transmitter. 2.2.4 disassembly required: disassemble the cabinet to the extent necessary to install the assemblies/modules which were ...

  • Page 38

    12 000 watt am broadcast transmitter xl12 page 2-14 01 january 2002 note if disassembly of an rf power module is necessary, refer to its service instruction manual for details. (h) inspect the main power transformer assembly for obvious damage. Verify all attaching hardware is firmly tightened. 2.2....

  • Page 39

    12 000 watt am broadcast transmitter xl12 page 2-15 01 january 2002 (b) secure each rf power module to its mounting tray using the retaining screw which is accessed through the hole in the front panel. Firmly tighten retaining screw. Note the retaining screw requires a slotted screwdriver (c) comple...

  • Page 40

    12 000 watt am broadcast transmitter xl12 page 2-16 01 january 2002 #12 to a23a1t1-y1 #13 to a23a1t1-y2 #14 to a23a1t1-y3 (d) locate three grey, 20awg wires (#329, #330 and #331 which originate at the dc power supply pwb and route them to the vicinity of the fuseholder (xf1) on the top of the transf...

  • Page 41

    12 000 watt am broadcast transmitter xl12 page 2-17 01 january 2002 warning (b) at the circuit breaker enclosure end, route the ac power wiring through the selected cable entry hole. - install the voltage carrying conductors on the circuit breaker's load terminals. - install the ground wire in the g...

  • Page 42

    12 000 watt am broadcast transmitter xl12 page 2-18 01 january 2002 (b) coaxial cable j2 ( rf monitor ) terminating at the remote interface pwb should be cut to the appropriate length and terminated by a bnc connector. (c) wires routed to a terminal on the remote interface pwb or if applicable, the ...

  • Page 43

    12 000 watt am broadcast transmitter xl12 page 2-19 01 january 2002 2.2.9.4 audio wiring: refer to paragraph 2.1.6 to identify the audio input options and then determine the audio input option(s) which is/are applicable to the exciter configuration in use. (a) route audio wires thru a cable entry ho...

  • Page 44

    12 000 watt am broadcast transmitter xl12 page 2-20 01 january 2002 figure 2-4 external input/output interface.

  • Page 45

    12 000 watt am broadcast transmitter xl12 page 2-21 01 january 2002 warning technical pre-commissioning 2.3 prior to applying ac power and turning on the transmitter, some circuits must be customized to the station's power source and operating requirements. The following should be completed. Note te...

  • Page 46

    12 000 watt am broadcast transmitter xl12 page 2-22 01 january 2002 table 2-2 primary winding taps for a23a2t1 nominal voltage dc pwr supply pwb (rms, phase-to-phase) connect 178-252 360-505 terminal e3 to 178-203 360-405 e7 204-223 406-450 e6 224-234 451-475 e5 235-252 476-505 e4 2.3.2 exciter rf d...

  • Page 47

    12 000 watt am broadcast transmitter xl12 page 2-23 01 january 2002 2.3.5 audio pass band selection: the interphase pdm driver pwbs (a1a5 for exciter 'a' and a1a6 for exciter 'b' on the exciter panel) have provision to select one of four audio pass bands. Refer to the interphase pdm driver pwbs. The...

  • Page 48

    12 000 watt am broadcast transmitter xl12 page 2-24 01 january 2002 table 2-4 grouping of alarm/status outputs status outputs alarm outputs influenced by influenced by resistor array u11 resistor array u12 resistor array u13 resistor array u14 rf pwr on rf dr b+ fail rf over current shutback remote ...

  • Page 49

    12 000 watt am broadcast transmitter xl12 page 2-25 01 january 2002 2.3.9 alarm display options: there are two display options available for the alarm display leds on the control/monitor panel. They can be preset for a continuous or a flashing alarm display when they are active. The factory default ...

  • Page 50

    12 000 watt am broadcast transmitter xl12 page 2-26 01 january 2002 warning commissioning procedures 2.4 these procedures are in a step-by-step format. They will permit a person who is not familiar with the transmitter to perform required checks. They should be completed in sequence, as each procedu...

  • Page 51

    12 000 watt am broadcast transmitter xl12 page 2-27 01 january 2002 (h) in lieu of normal station programming, connect an audio signal generator [preset to 1000hz at a zero output level (turned off)], between tb2- 8(+) and tb2-9(-) of the remote interface pwb. Ensure the peak-to-peak amplitude of th...

  • Page 52

    12 000 watt am broadcast transmitter xl12 page 2-28 01 january 2002 table 2-5 dc volts meter readings meter reading meter scale selected min max b+ 320.0 340.0 pa volts 0.0 0.0 +48v 45.0 52.0 +24v 20.0 28.0 +15v 14.0 16.0 +5v 4.8 5.2 -5v 4.8 5.2 -15v 14.0 16.0 (d) verify the lamps in the local , rf ...

  • Page 53

    12 000 watt am broadcast transmitter xl12 page 2-29 01 january 2002 2.4.4 rf drive checks: check the frequency, symmetry and level of the rf drive for the 'a' and 'b' exciters as follows: (a) verify the requirements of paragraph 2.4.3 have been completed and are being met. 2.4.4.1 rf drive frequency...

  • Page 54

    12 000 watt am broadcast transmitter xl12 page 2-30 01 january 2002 figure 2-6 balanced rf amplifier output ƒ c = 1700khz (ac coupled) (d) select exciter a. Press/release exciter a switch noting its integral lamp turns on and the exciter b switch's lamp turns off. (e) repeat steps (a) thru (c). (f) ...

  • Page 55

    12 000 watt am broadcast transmitter xl12 page 2-31 01 january 2002 (c) all bicolor status lamps shall be green. Note if a status lamp is red, a fault condition exists. Refer to section 5 to determine the cause and the remedial action which must be taken. (d) verify forward power is selected to be d...

  • Page 56

    12 000 watt am broadcast transmitter xl12 page 2-32 01 january 2002 (c) connect an ac voltmeter across the 50 ohm, 10w resistive load connected to the rf monitor connector. (d) set monitor circuit's rf pwr 1 potentiometer (r26) fully counter clockwise. (e) verify a 2-socket shunt post is not install...

  • Page 57

    12 000 watt am broadcast transmitter xl12 page 2-33 01 january 2002 2.4.6 modulation checks: verify the rf output is appropriately modulated when audio is applied, as follows: (a) verify transmitter's rf output is connected to a 50 ohm, resistive, 20kw, dummy load. (b) verify the rf power stages hav...

  • Page 58

    12 000 watt am broadcast transmitter xl12 page 2-34 01 january 2002 (e) set the output level of the audio signal generator to zero (turned off). (f) select exciter a. Press/release exciter a switch noting its integral lamp turns on and the exciter b switch's lamp turns off. Note if a c-quam am stere...

  • Page 59

    12 000 watt am broadcast transmitter xl12 page 2-35 01 january 2002 modulated at 95% by 20hz sine wave figure 2-8 rf output with positive peak limiting (c) verify an audio generator is connected as the modulating source. (d) preset audio generator to provide a 20hz sine wave at a zero output level (...

  • Page 60

    12 000 watt am broadcast transmitter xl12 page 2-36 01 january 2002 special adjustment procedures 2.5 procedures referred to as special adjustment procedures contain adjustments that should not have to be altered once they have been established. They have been precisely set at the factory prior to s...

  • Page 61

    12 000 watt am broadcast transmitter xl12 page 2-37 01 january 2002 (k) adjust output of audio generator for a 90 percent modulation depth indication on the left plus right (l + r) channel of the station's stereo modulation monitor. Ensure the left and right signals are equal. (l) adjust active rf d...

  • Page 62

    12 000 watt am broadcast transmitter xl12 page 3-1 01 january 2002 section 3 controls and indicators general 3.1 the following section is intended to familiarize operators and maintainers with the various controls and indicators contained in the transmitter. Control/monitor panel controls and indica...

  • Page 63

    12 000 watt am broadcast transmitter xl12 page 3-2 01 january 2002 8-input rf combiner/ filter assembly 3.7 table 3-6 identifies controls and/or indicators on the 8-input rf combiner/filter assembly (a22). The table identifies the panel marking, or when there is no marking, the nomenclature used in ...

  • Page 64

    12 000 watt am broadcast transmitter xl12 page 3-3 01 january 2002 table 3-1 control/monitor panel controls and indicators panel marking/ ref fig nomenclature function des no. Used in text a1a1ds3 md-3 ♥ forward power when turned on, indicates the forward power level is selected as the rf output par...

  • Page 65

    12 000 watt am broadcast transmitter xl12 page 3-4 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a2ds8 md-3 ♣ -15v when turned on, indicates the output voltage of the active exciter's regulated ...

  • Page 66

    12 000 watt am broadcast transmitter xl12 page 3-5 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3ds6 md-3 ♦ rf power - shutback bi-colour display which indicates the on/off status of the pulse...

  • Page 67

    12 000 watt am broadcast transmitter xl12 page 3-6 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3ds10 md-3 ♦ exciter - modulator protection bi-colour display which indicates status of over mod...

  • Page 68

    12 000 watt am broadcast transmitter xl12 page 3-7 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3ds14 md-3 ♦ exciter - interphase pdm drive bi-colour display which indicates the status of the ...

  • Page 69

    12 000 watt am broadcast transmitter xl12 page 3-8 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3ds19 md-3 ♦ output network - temperature bi-colour display which indicates the status of the te...

  • Page 70

    12 000 watt am broadcast transmitter xl12 page 3-9 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3e1 md-3 ♠ solid/flashing bi-position selector circuit that allows the user to configure alarm l...

  • Page 71

    12 000 watt am broadcast transmitter xl12 page 3-10 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3s1 md-3 ♦ control - ∧ ∧ (incr rf pwr) push button switch that causes an incremental increase i...

  • Page 72

    12 000 watt am broadcast transmitter xl12 page 3-11 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3s2 md-3 ♦ control - ∨ ∨ (decr rf pwr) push button switch that causes an incremental increase i...

  • Page 73

    12 000 watt am broadcast transmitter xl12 page 3-12 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3s6 md-3 ♦ control - exciter a push button switch that selects exciter 'a' as the main exciter ...

  • Page 74

    12 000 watt am broadcast transmitter xl12 page 3-13 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3s8 md-3 ♦ control - rf on push button switch that turns on the transmitter's rf power stage wh...

  • Page 75

    12 000 watt am broadcast transmitter xl12 page 3-14 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a3s15 md-3 ♦ status control - alarm recall push button switch that activates the alarm recall fe...

  • Page 76

    12 000 watt am broadcast transmitter xl12 page 3-15 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a4e2 md-3 ♠ rf pwr off bi-position selector circuit that allows the user to configure the rf pwr...

  • Page 77

    12 000 watt am broadcast transmitter xl12 page 3-16 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a4e12 md-3 ♠ decr rf pwr bi-position selector circuit that allows the user to configure the decr...

  • Page 78

    12 000 watt am broadcast transmitter xl12 page 3-17 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1a4r29 md-3 n rf pwr 4 adjusted, in conjunction with selection of the remote interface pwb's e22/...

  • Page 79

    12 000 watt am broadcast transmitter xl12 page 3-18 01 january 2002 table 3-1 control/monitor panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a1m3 md-3 dc volts displays dc voltage selected by the associated select meter scale switch when e...

  • Page 80

    12 000 watt am broadcast transmitter xl12 page 3-19 01 january 2002 table 3-2 exciter panel controls and indicators panel marking/ ref fig nomenclature function des no. Used in text a2a1s1 md-7 audio source three position switch ( stereo, dual , or single ), with its setting determined by the number...

  • Page 81

    12 000 watt am broadcast transmitter xl12 page 3-20 01 january 2002 table 3-2 exciter panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a2a1 ♦ e2 md-6 freq divider bi-position selector circuit that selects one of two (/2 or /4) oscillator fre...

  • Page 82

    12 000 watt am broadcast transmitter xl12 page 3-21 01 january 2002 table 3-2 exciter panel controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a2a1 ♥ s1 md-6 audio filter binary selector switch that selects one of four frequencies (7.5khz, 10.5khz, ...

  • Page 83

    12 000 watt am broadcast transmitter xl12 page 3-22 01 january 2002 table 3-3 rf drive tuning pwb controls and indicators panel marking/ ref fig nomenclature function des no. Used in text a11a2r5 md-10 rf drive threshold adjusted to set the rf drive fail threshold to detect a failure in an rf drive ...

  • Page 84

    12 000 watt am broadcast transmitter xl12 page 3-23 01 january 2002 table 3-4 rf drive stage controls and indicators panel marking/ ref fig nomenclature function des no. Used in text a11a4ds1 md-11 +15v when turned on, indicates +15 vdc is being applied to the control circuit of exciter a's regulate...

  • Page 85

    12 000 watt am broadcast transmitter xl12 page 3-24 01 january 2002 table 3-5 ac/dc power supply controls and indicators panel marking/ ref fig nomenclature function des no. Used in text f1 md-2 b+ (a/b) fuses b+ to rf power modules 'a' and 'b' at 20 amperes. F2 md-2 b+ (c/d) fuses b+ to rf power mo...

  • Page 86

    12 000 watt am broadcast transmitter xl12 page 3-25 01 january 2002 table 3-5 ac/dc power supply controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a28f2 md-26 +24 v (unreg) fuses unregulated +24v supplied to choke l3 at 10 amperes. A28f3 md-26 -24 ...

  • Page 87

    12 000 watt am broadcast transmitter xl12 page 3-26 01 january 2002 table 3-5 ac/dc power supply controls and indicators (continued) panel marking/ ref fig nomenclature function des no. Used in text a29ds5 md-27 -8v when turned on, indicates the dc power supply's unregulated -8v power supply is prod...

  • Page 88

    12 000 watt am broadcast transmitter xl12 page 3-27 01 january 2002 table 3-6 8-input rf combiner/filter controls and indicators panel marking/ ref fig nomenclature function des no. Used in text a22s1 md-18 filter interlock micro switch that is held in its spring-loaded, normally open position and c...

  • Page 89

    12 000 watt am broadcast transmitter xl12 page 3-28 01 january 2002 table 3-7 forward/reflected power probe controls and indicators panel marking/ ref fig nomenclature function des no. Used in text a21a2a1s1 md-16 refld pwr cal in-circuit elements determine load impedance for the secondary winding o...

  • Page 90

    12 000 watt am broadcast transmitter xl12 page 4-1 01 january 2002 warning warning section 4 operating instructions general 4.1 the following instructions are primarily intended for persons involved in testing or maintenance of the equipment. 4.1.1 precautions to be observed: the xl12 transmitter co...

  • Page 91

    12 000 watt am broadcast transmitter xl12 page 4-2 01 january 2002 electrostatic protection 4.5 the transmitter's assemblies contain semiconductor devices that are susceptible to damage from electrostatic discharge. Prior to removing an assembly from the transmitter, and while servicing an assembly,...

  • Page 92

    12 000 watt am broadcast transmitter xl12 page 4-3 01 january 2002 4.7.2 reading dc volts meter: the dc volts meter displays the selected input voltage on one of three scales when the meter has been enabled (integral lamp of status control - meter on/off switch is on). Parameter to be displayed is s...

  • Page 93

    12 000 watt am broadcast transmitter xl12 page 4-4 01 january 2002 operational controls 4.9 the following operational controls select or vary functions that are/may be routinely changed by an operator during normal operation: note the following assumes local control has been selected and identifies ...

  • Page 94

    12 000 watt am broadcast transmitter xl12 page 4-5 01 january 2002 4.9.3 rf power trim: the rf power level of the selected preset rf power level can be incrementally changed (nominal 1000 increments) by individually pressing/releasing the rf power trim ∧ ∧ (increase) or ∨ ∨ (decrease) switches. The ...

  • Page 95

    12 000 watt am broadcast transmitter xl12 page 4-6 01 january 2002 note the continuous/flashing display feature is a user determined option that is preset during technical pre-commissioning installation procedures. 4.10.2 display type: there are two types of alarm circuits (latching and non-latching...

  • Page 96

    12 000 watt am broadcast transmitter xl12 page 4-7 01 january 2002 testing displays 4.11 the integral lamps of the control/ monitor panel's push-button switches, its meter input selection lamps and its status indicators may be tested by pressing and holding for the status control - led test switch t...

  • Page 97

    12 000 watt am broadcast transmitter xl12 page 4-8 01 january 2002 4.12.3.2 over temperature detector: each rf power module has an over temperature detector circuit. This circuit inhibits (turns off) the rf power amplifiers in that rf power module when a temperature in excess of 85 ° c is detected. ...

  • Page 98

    12 000 watt am broadcast transmitter xl12 page 5-1 01 january 2002 section 5 system level trouble shooting general 5.1 this section contains scheduled and corrective maintenance information for the subject transmitter. Fault symptoms should be analyzed to determine the corrective action required. No...

  • Page 99

    12 000 watt am broadcast transmitter xl12 page 5-2 01 january 2002 5.3.1 on-air trouble shooting: on- air trouble shooting can be performed from a remote location or locally at the transmitter site. 5.3.1.1 remote trouble shooting: remote on- air trouble shooting consists of monitoring the transmitt...

  • Page 100

    12 000 watt am broadcast transmitter xl12 page 5-3 01 january 2002 5.5.1 rf power modules alarm: an rf power modules alarm indicates a failure in one or more rf power modules. Note it is permissible to operate the transmitter with a defective or missing rf power module. Do not attempt to compensate ...

  • Page 101

    12 000 watt am broadcast transmitter xl12 page 5-4 01 january 2002 (a) connect a digital multimeter (set to dc volts), between the anode of cr77 (+) and ground (tp27) on system control pwb. (b) if +5 vdc is present on the anode of cr77, the internal interlock circuit is open. The probable cause is a...

  • Page 102

    12 000 watt am broadcast transmitter xl12 page 5-5 01 january 2002 (b) measure the incoming ac voltage and verify the power supply transformer is tapped as tabulated in table 2-2. (c) if the power supply transformer taps are correct, switch off ac input voltage and gain access to the ac/dc power sup...

  • Page 103

    12 000 watt am broadcast transmitter xl12 page 5-6 01 january 2002 figure 5-1 rf drive amplifier output waveform ƒ c = 1700khz (ac coupled) (c) on the exciter interface pwb, measure the following: - +5v on r19-lhs - +15v on r20-lhs - -5v on r21-lhs - -15v on r22-lhs if any of these are incorrect, su...

  • Page 104

    12 000 watt am broadcast transmitter xl12 page 5-7 01 january 2002 figure 5-3 rf drive waveform ƒ c = 1700khz (ac coupled) note if the c-quam stereo exciter or frequency synthesizer pwb is being used as the rf drive source, refer to the associated service instruction manual for trouble shooting info...

  • Page 105

    12 000 watt am broadcast transmitter xl12 page 5-8 01 january 2002 figure 5-5 interphase pdm waveform ƒ pdm = 75khz (dc coupled) (e) measure dc voltage at u1-16 on the exciter interface pwb. If approximately 0v, suspect the system control pwb's alarm circuitry. If approximately 5v at u1-16, suspect ...

  • Page 106

    12 000 watt am broadcast transmitter xl12 page 5-9 01 january 2002 figure 5-7 chopper control waveform audio = 30hz (ac coupled) 5.5.14 exciter - external pdm inhibit alarm: an external pdm inhibit alarm indicates that an external pdm inhibit command is present. The alarm could be caused by an short...

  • Page 107

    12 000 watt am broadcast transmitter xl12 page 5-10 01 january 2002 (c) if the rf output power does not cutback, the fault no longer exists. Press alarm recall . The fault that caused cutback shall turn red. Refer to the appropriate paragraph in this section for trouble shooting information, if nece...

  • Page 108

    12 000 watt am broadcast transmitter xl12 page 5-11 01 january 2002 note a vswr alarm will always cause a shutback . If the problem occurs three times within three seconds, the transmitter shall be in cutback mode to reduce rf output power until the vswr alarm not exists. (a) read the forward and re...

  • Page 109

    12 000 watt am broadcast transmitter xl12 page 5-12 01 january 2002 (c) place a short circuit between tp4 and ground on the rf drive tuning pwb. (d) remove the connector from e1 on rf drive amplifier 'a' (a11a1) and connect an rf generator between the wire and ground. Set the rf generator to the tra...

  • Page 110

    12 000 watt am broadcast transmitter xl12 page 5-13 01 january 2002 (h) adjust the voltage control potentiometer on the exciter a rf drive regulated power supply a11a4 until a reading of 22 volts peak- to-peak are recorded on the oscilloscope. (i) operate the transmitter from exciter b. (j) repeat s...

  • Page 111

    12 000 watt am broadcast transmitter xl12 page 5-14 01 january 2002 pwb replacement/adjustment 5.7 install and adjust replacement printed wiring boards as follows: 5.7.1 system control pwb replacement: refer to figure md-3 to locate the system control pwb. (a) remove and retain three aa batteries fr...

  • Page 112

    12 000 watt am broadcast transmitter xl12 page 5-15 01 january 2002 5.7.2 distribution pwb replacement/adjustment: install a replacement distribution pwb as follows (see figure md-1 for location of distribution pwb a16, noting it is mounted on the left-hand side of the transmitter behind the hinged ...

  • Page 113

    12 000 watt am broadcast transmitter xl12 page 5-16 01 january 2002 (f) refer to the transmitter configuration sheet and to paragraph 2.3.1.2 of this manual to set dc power supply links (g) turn on ac power at the service entrance. Press rf on on the front panel of the transmitter. 5.7.5 rf drive pw...

  • Page 114

    12 000 watt am broadcast transmitter xl12 page 6-1 01 january 2002 section 6 theory of operation general 6.1 the theory of operation for the xl12 am broadcast transmitter is presented in this section. System overview 6.2 the transmitter circuitry is subdivided into five functional blocks - exciter s...

  • Page 115

    12 000 watt am broadcast transmitter xl12 page 6-2 01 january 2002 the modulating audio signal will be applied to the a interphase driver under normal conditions when audio source switch s1 is set to single source . The fpdm for the rf power stages is sourced from the a interphase driver pwb. When a...

  • Page 116

    12 000 watt am broadcast transmitter xl12 page 6-3 01 january 2002 the pdm sample is also compared against a bias voltage proportional to the carrier ref voltage to determine if the pdm pulse width is in correct proportion to the applied gain control voltage. 6.3.1.6 low voltage supply detector: com...

  • Page 117

    12 000 watt am broadcast transmitter xl12 page 6-4 01 january 2002 rf drive stage 6.4 the rf drive stage amplifies the carrier frequency signal fc generated by the active rf drive pwb. The rf drive stage comprises a and b regulated power supplies and rf drive amplifiers, series rf drive tuning and a...

  • Page 118

    12 000 watt am broadcast transmitter xl12 page 6-5 01 january 2002 rf power stage 6.5 the rf power stage comprises eight rf power modules, an rf output filter/combiner section, a distribution pwb and four fan trays. The rf power stage accepts rf drive, interphase pdm drive pdm1 and pdm2, pdm frequen...

  • Page 119

    12 000 watt am broadcast transmitter xl12 page 6-6 01 january 2002 6.5.1.4 fan current limiters: the supply voltage for the rf power module cooling fans is passed thru positive temperature coefficient (ptc) thermistors. If the current in a thermistor exceeds 0.9 amps, the thermistor will switch to a...

  • Page 120

    12 000 watt am broadcast transmitter xl12 page 6-7 01 january 2002 6.5.3.6 surge arrestor assembly: the surge arrestor assembly (a22a11) monitors the rf voltage level at the combiner's common point. Whenever this voltage exceeds 4000v peak (usually as a result of a lightning strike), gas gap e1 fire...

  • Page 121

    12 000 watt am broadcast transmitter xl12 page 6-8 01 january 2002 6.6.5 rf on/off control: the remote on/off control circuit must be the equivalent of a single pole, three position (on/off/on) switch. Each of the on positions must be spring-loaded to return to the off position when the toggle is re...

  • Page 122

    12 000 watt am broadcast transmitter xl12 page 6-9 01 january 2002 6.6.13.1 forward power level: a buffered dc voltage that is representative of the forward power level is available at the bfrd fwd pwr terminal. This voltage is a non-linear (square law) function of the forward power level and will b...

  • Page 123

    12 000 watt am broadcast transmitter xl12 page 6-10 01 january 2002 6.6.14.6 internal interlock alarm: the internal interlock alarm output is applied to the remote interface pwb's int intlk alarm terminal. When the interlock circuit is intact, the output is an open collector. When the interlock is o...

  • Page 124

    12 000 watt am broadcast transmitter xl12 page 6-11 01 january 2002 6.6.15.2 rf on status : the rf on status output is applied to the remote interface pwb's status - rf on terminal. When the transmitter is turned off, the rf on status output is an open collector. When the transmitter is turned on, b...

  • Page 125

    12 000 watt am broadcast transmitter xl12 page 6-12 01 january 2002 when the 3-phase ac supply voltage is removed from the transmitter, contactors a23k1 and a23k2 de-energize and power supply control pwb applies a ground to resistor r5 to discharge the b+ supply. 6.7.2.1 3ø rectifier: the three phas...

  • Page 126

    12 000 watt am broadcast transmitter xl12 page 6-13 01 january 2002 6.7.4 dc power supply monitor pwb (see figure sd-12): the dc power supply monitor pwb (a29) provides leds and test points for monitoring the status of the transmitter's critical operating voltages. It also contains circuitry which m...

  • Page 127

    12 000 watt am broadcast transmitter xl12 page 7-1 01 january 2002 section 7 component level trouble shooting trouble shooting reference data 7.1 the information provided in this section is intended to assist an experienced electronic technician in fault diagnosis and isolation. Tables of typical vo...

  • Page 128

    12 000 watt am broadcast transmitter xl12 page 7-2 01 january 2002 7.5.2 rf power module: there are no user accessible test points on the rf power module. Refer to the rf power module service instruction manual for trouble shooting information. Control/monitor function 7.6 the following section prov...

  • Page 129

    12 000 watt am broadcast transmitter xl12 page 7-3 01 january 2002 table 7-1 test voltages for exciter interface pwb (a2a1) location description test voltage/waveform tp1 ground ground tp2 pdm 1 3 ± 0.5v tp3 pdm 2 3 ± 0.5v tp4 detected carrier reference 2 ± 0.5v tp5 carrier reference 7.5 ± 0.5v tp6 ...

  • Page 130

    12 000 watt am broadcast transmitter xl12 page 7-4 01 january 2002 table 7-2 test voltages/waveforms for rf drive pwb (a2a1a1/a2a1a4) location description test voltage/waveform tp1 ground ground tp2 ground ground tp3 ground ground tp4 carrier frequency ƒ c see figure 7-3 tp5 ipm compensation input -...

  • Page 131

    12 000 watt am broadcast transmitter xl12 page 7-5 01 january 2002 table 7-3 test voltages for dc power supply pwb (a2a1a2/a2a1a3) location description test voltage/waveform tp1 ground ground tp2 +15v 15 ± 0.4v tp3 +5v 5.0 ± 0.2v tp4 -15v -15 ± 0.4v tp5 -5v -5.0 ± 0.2v.

  • Page 132

    12 000 watt am broadcast transmitter xl12 page 7-6 01 january 2002 table 7-4 test voltages/waveforms for interphase pdm driver pwb (a2a1a5/a2a1a6) location description test voltage/waveform tp1 mod level detector input see figure 7-4 tp2 mod level detector output see figure 7-5 tp3 audio with positi...

  • Page 133

    12 000 watt am broadcast transmitter xl12 page 7-7 01 january 2002 figure 7-6 audio with positive peak limiting figure 7-7 carrier level control input monitor tp9, rf = 12kw @ 50% mod, ƒ mod = 1000hz figure 7-8 carrier level control output figure 7-9 linear integrator output monitor tp3, rf= 12kw @9...

  • Page 134

    12 000 watt am broadcast transmitter xl12 page 7-8 01 january 2002 figure 7-10 interphase generator input - pdm 1 figure 7-11 interphase generator input - pdm 2 figure 7-12 pdm1 output figure 7-13 pdm2 output monitor tp14, rf = 12kw @ 50% mod, ƒ mod = 1000hz monitor tp15, rf = 12kw @ 50% mod, ƒ mod ...

  • Page 135

    12 000 watt am broadcast transmitter xl12 page 7-9 01 january 2002 figure 7-14 ƒ pdm output monitor tp18, ƒ pdm = 72khz.

  • Page 136

    12 000 watt am broadcast transmitter xl12 page 7-10 01 january 2002 table 7-5 test voltages for regulated power supply pwb (a11a4/a11a5) location description test voltage/waveform e1 +48v supply 50v e2 ground reference ground e3 rf drive b+ see transmitter configuration sheet e4 ground reference gro...

  • Page 137

    12 000 watt am broadcast transmitter xl12 page 7-11 01 january 2002 table 7-6 test voltages/waveforms for rf drive amplifier (a11a1/a11a3) location description test voltage/waveform e1 rf amplifier output see figure 7-15 tp1 rf amplifier input see figure 7-16 figure 7-15 rf amplifier output figure 7...

  • Page 138

    12 000 watt am broadcast transmitter xl12 page 7-12 01 january 2002 table 7-7 test voltages/waveforms for rf drive tuning pwb (a11a2) location description test voltage/waveform tp1 ground reference ground tp2 detected rf drive 6.5v tp3 rf drive fail alarm (not active) 0v tp4 tuned rf drive see figur...

  • Page 139

    12 000 watt am broadcast transmitter xl12 page 7-13 01 january 2002 table 7-8 test voltages/waveforms for distribution pwb (a16) location description test voltage/waveform tp1 filter temperature threshold 6.8v tp2 ground reference ground tp3 ground reference ground tp4 filter high temp alarm (not ac...

  • Page 140

    12 000 watt am broadcast transmitter xl12 page 7-14 01 january 2002 table 7-9 test voltages/waveforms for system control pwb (a1a3) location description test voltage/waveform tp1 ground reference ground tp2 xmtr fault 0v tp3 pdm carrier reference see figure 7-18 tp4 carrier reference +7 - +8v tp5 gr...

  • Page 141

    12 000 watt am broadcast transmitter xl12 page 8-1 01 january 2002 section 8 parts list introduction 8.1 this section contains reference designation indexes that provide descriptive and provisioning information for all electrical and mechanical parts that have been assigned a reference designation a...

  • Page 142

    12 000 watt am broadcast transmitter xl12 page 8-2 01 january 2002 8.6.2 referebce designation column: the reference designation column contains the reference designation for a specific part. These designations are assigned in accordance with the requirements of american national standard specificat...

  • Page 143

    12 000 watt am broadcast transmitter xl12 page 8-3 01 january 2002 table 8-1 manufacturers' code to address index 0apz0 diodes incorporated, 3050 e. Hillcrest drive, westlake village, california 91362 0gp12 radial incorporated 150 long beach blvd, stratford, connecticut 06497 00779 amp incorporated,...

  • Page 144

    12 000 watt am broadcast transmitter xl12 page 8-4 01 january 2002 table 8-1 manufacturers' code to address index (continued) 34361 omron electronics incorporated, 432 toyama road, sunnyvale, california 94086 35005 dale electronics canada limited, 18 howden road, scarborough, ontario, canada m1r 3e6...

  • Page 145

    12 000 watt am broadcast transmitter xl12 page 8-5 01 january 2002 table 8-1 manufacturers' code to address index (continued) 73831 hammond mfg company limited, 394 edinburgh road north, guelph, ontario, canada n1h 1e5 73949 guardian electric mfg company, 1550 w carroll avenue, chicago, illinois 606...

  • Page 146

    12 000 watt am broadcast transmitter xl12 page 8-6 01 january 2002 figure 8-1 family tree - xl12 12kw am broadcast transmitter (sheet 1 of 3) control/monitor panel nac101 (see table 8-3) a1 system control pwb napc103/01 (see napc103 manual) a1a3 2-input meter switch/ monitor pwb napd07/02 (part of t...

  • Page 147

    12 000 watt am broadcast transmitter xl12 page 8-7 01 january 2002 figure 8-1 family tree - xl12 12kw am broadcast transmitter (sheet 2 of 3) fan tray 183-8350 (see table 8-2) a17 fan tray 183-8350 (see table 8-2) a19 fan tray 183-8350 (see table 8-2) a18 fan tray 183-8350 (see table 8-2) a20 relay ...

  • Page 148

    12 000 watt am broadcast transmitter xl12 page 8-8 01 january 2002 figure 8-1 family tree - xl12 12kw am broadcast transmitter (sheet 3 of 3) 3 Ø rectifier assembly up28 (part of table 8-2) a25 3 Ø rectifier assembly up28 (part of table 8-2) a26 power supply monitor pwb napx15/? (see napx15 manual) ...

  • Page 149

    12 000 watt am broadcast transmitter xl12 page 8-9 01 january 2002 table 8-2 reference designation index - xl12 12kw am broadcast transmitter use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code - 12kw am broadcast transmitter xl12 183-8750 37338 a1 control/m...

  • Page 150

    12 000 watt am broadcast transmitter xl12 page 8-10 01 january 2002 table 8-2 reference designation index - xl12 12kw am broadcast transmitter (continued) use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code a28 dc power supply pwb naps16b see table 8-17 3733...

  • Page 151

    12 000 watt am broadcast transmitter xl12 page 8-11 01 january 2002 table 8-2 reference designation index - xl12 12kw am broadcast transmitter (continued) use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code p29 connector, mta, keyed, 4-pin, 22awg ju27 644463...

  • Page 152

    12 000 watt am broadcast transmitter xl12 page 8-12 01 january 2002 table 8-2 reference designation index - xl12 12kw am broadcast transmitter (continued) use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code xf3 fuseblock, 30a, 600v, 2-position fd02 bm6032sq ...

  • Page 153

    12 000 watt am broadcast transmitter xl12 page 8-13 01 january 2002 table 8-3 reference designation index - nac101 control/monitor panel use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - control/monitor assembly nac101 183-2050 37338 a1 meter sw...

  • Page 154

    12 000 watt am broadcast transmitter xl12 page 8-14 01 january 2002 table 8-3 reference designation index - nac101 control/monitor panel (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code w2 ribbon cable assembly, 26 cond 183-2021 183-2...

  • Page 155

    12 000 watt am broadcast transmitter xl12 page 8-15 01 january 2002 table 8-4 reference designation index - napi25 remote interface pwb use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - remote interface pwb napi25a 183-2015-01 / 37338 c1 capacit...

  • Page 156

    12 000 watt am broadcast transmitter xl12 page 8-16 01 january 2002 table 8-4 reference designation index - napi25 remote interface pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code c48 capacitor, ceramic, 0.1uf 10% 100v ccg07 ckr0...

  • Page 157

    12 000 watt am broadcast transmitter xl12 page 8-17 01 january 2002 table 8-4 reference designation index - napi25 remote interface pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code e8 post shunt, 2 socket-contacts, 0.10 centre jq1...

  • Page 158

    12 000 watt am broadcast transmitter xl12 page 8-18 01 january 2002 table 8-4 reference designation index - napi25 remote interface pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code r15 resistor, metal film, 2200 ohms, 2% 1/2w rc41...

  • Page 159

    12 000 watt am broadcast transmitter xl12 page 8-19 01 january 2002 table 8-4 reference designation index - napi25 remote interface pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code r63 resistor, metal film, 470 ohms, 5% 2w rbp11 g...

  • Page 160

    12 000 watt am broadcast transmitter xl12 page 8-20 01 january 2002 table 8-4 reference designation index - napi25 remote interface pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code xe5 header, sip, 3 pin-contacts, 0.10 centre 161-...

  • Page 161

    12 000 watt am broadcast transmitter xl12 page 8-21 01 january 2002 table 8-5 reference designation index - napi22 exciter interface pwb use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - exciter interface pwb napi22e 183-3017-05 / 37338 ♦ a1 rf ...

  • Page 162

    12 000 watt am broadcast transmitter xl12 page 8-22 01 january 2002 table 8-5 reference designation index - napi22 exciter interface pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code c40 capacitor, ceramic, 0.0022uf 10% 100v ccg02 ...

  • Page 163

    12 000 watt am broadcast transmitter xl12 page 8-23 01 january 2002 table 8-5 reference designation index - napi22 exciter interface pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code l10 inductor, choke, 2.5 turns, j material la16 ...

  • Page 164

    12 000 watt am broadcast transmitter xl12 page 8-24 01 january 2002 table 8-5 reference designation index - napi22 exciter interface pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code r32 resistor, metal film, 5.62 ohms, 1% 1/2w rc1...

  • Page 165

    12 000 watt am broadcast transmitter xl12 page 8-25 01 january 2002 table 8-6 reference designation index - nae83 rf drive panel use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code ƒ 1 - rf drive panel (530-800khz) nae83/01 183-8600-01 37338 ƒ 2 - rf drive p...

  • Page 166

    12 000 watt am broadcast transmitter xl12 page 8-26 01 january 2002 table 8-7 reference designation index - naaa02 rf drive amplifier use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - rf drive amplifier assembly naaa02 183-3029 c/3 37338 c1 capa...

  • Page 167

    12 000 watt am broadcast transmitter xl12 page 8-27 01 january 2002 table 8-8 reference designation index - napi60 rf drive tuning pwb use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code ƒ 1 - rf drive tuning pwb (530-800khz) napi60/01 183-3134-01 /...

  • Page 168

    12 000 watt am broadcast transmitter xl12 page 8-28 01 january 2002 table 8-8 reference designation index - napi60 rf drive tuning pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code r3 resistor, metal film, 33.2k ohms, 1%, 1/4w rab4...

  • Page 169

    12 000 watt am broadcast transmitter xl12 page 8-29 01 january 2002 table 8-8 reference designation index - napi60 rf drive tuning pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code t1 transformer, rf drive current 183-1135 183-1135...

  • Page 170

    12 000 watt am broadcast transmitter xl12 page 8-30 01 january 2002 table 8-9 reference designation index - naps10 regulated dc power supply pwb use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - regulated power supply pwb naps10b 183-3027-02 / 3...

  • Page 171

    12 000 watt am broadcast transmitter xl12 page 8-31 01 january 2002 table 8-10 reference designation index - napi50 distribution pwb use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - distribution pwb napi50b 183-8090-02 / 37338 c1 capacitor, cer...

  • Page 172

    12 000 watt am broadcast transmitter xl12 page 8-32 01 january 2002 table 8-10 reference designation index - napi50 distribution pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code j4 header, mta, keyed, 12 posts, 0.156 centre ju21 1...

  • Page 173

    12 000 watt am broadcast transmitter xl12 page 8-33 01 january 2002 table 8-10 reference designation index - napi50 distribution pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code r15 resistor, metal film, 39.2k ohms, 1% 1/4w rab44 ...

  • Page 174

    12 000 watt am broadcast transmitter xl12 page 8-34 01 january 2002 table 8-11 reference designation index - naf102 rf output filter use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code ƒ 1 - rf filter, (535-610khz) naf102/01 183-6085-01 37338 ƒ 2 - rf filter...

  • Page 175

    12 000 watt am broadcast transmitter xl12 page 8-35 01 january 2002 table 8-11 reference designation index - naf102 rf output filter (continued) use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code note: partial reference designation shown. Prefix with a21 (c...

  • Page 176

    12 000 watt am broadcast transmitter xl12 page 8-36 01 january 2002 table 8-12 reference designation index - nafp90 forward/reflected power probe use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - forward/reflected power probe nafp90a 183-6300-01...

  • Page 177

    12 000 watt am broadcast transmitter xl12 page 8-37 01 january 2002 table 8-12 reference designation index - nafp90 forward/reflected power probe (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code j1 connector, coaxial, bnc, 50 , bulkhe...

  • Page 178

    12 000 watt am broadcast transmitter xl12 page 8-38 01 january 2002 table 8-13 reference designation index naf101 8-input rf combiner/filter use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code ƒ 1 - 8 input combiner filter, (535-610khz) naf101a/01 183-6080-1...

  • Page 179

    12 000 watt am broadcast transmitter xl12 page 8-39 01 january 2002 table 8-13 reference designation index - naf101 8-input rf combiner/filter (continued) use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code ƒ 3 c3 capacitor, mica, cast, 6800pf 5% 10000v cu14...

  • Page 180

    12 000 watt am broadcast transmitter xl12 page 8-40 01 january 2002 table 8-13 reference designation index - naf101 8-input rf combiner/filter (continued) use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code note : partial reference designation shown. Prefix ...

  • Page 181

    12 000 watt am broadcast transmitter xl12 page 8-41 01 january 2002 table 8-14 reference designation index - napp02 rf current probe pwb use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code ♦ - rf current probe pwb (535-1370khz) napp02a 183-6050-02 37338 ♠ - ...

  • Page 182

    12 000 watt am broadcast transmitter xl12 page 8-42 01 january 2002 table 8-15 reference designation index - nax202/04 surge arrestor assembly use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code - surge arrestor assembly, 4000v nax202/04 194-6070-04 37338 c1...

  • Page 183

    12 000 watt am broadcast transmitter xl12 page 8-43 01 january 2002 table 8-16 reference designation index - nasr108 ac/dc power supply use ref name of part nautel's jan/mil/oem oem code des and description part no. Part no. Code ♠ - ac/dc power supply, 188-240 vac, 50/60hz nasr108/01 183-7350-01 37...

  • Page 184

    12 000 watt am broadcast transmitter xl12 page 8-44 01 january 2002 table 8-17 reference designation index - naps16 dc power supply pwb use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - dc power supply pwb naps16c 183-7020-03 / 37338 c1 capacito...

  • Page 185

    12 000 watt am broadcast transmitter xl12 page 8-45 01 january 2002 table 8-17 reference designation index - naps16 dc power supply pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code f1 fuse, 3a, 250v, slow, 3ag fa10 313003 g/6 7591...

  • Page 186

    12 000 watt am broadcast transmitter xl12 page 8-46 01 january 2002 table 8-17 reference designation index - naps16 dc power supply pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code r20 resistor, metal film, 1000 ohms, 5% 2w rbp13 ...

  • Page 187

    12 000 watt am broadcast transmitter xl12 page 8-47 01 january 2002 table 8-17 reference designation index - naps16 dc power supply pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code u4 ic, opto-isolator, triac driver output ux41 mo...

  • Page 188

    12 000 watt am broadcast transmitter xl12 page 8-48 01 january 2002 table 8-18 reference designation index - napi48 dc power supply monitor pwb use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code - dc power supply monitor pwb napi48b 183-7022-02 / 3...

  • Page 189

    12 000 watt am broadcast transmitter xl12 page 8-49 01 january 2002 table 8-18 reference designation index - napi48 dc power supply monitor pwb (continued) use ref name of part nautel's jan/mil/oem x/y oem code des and description part no. Part no. Grid code r11 resistor, variable, film, 100k ohms, ...

  • Page 190

    12 000 watt am broadcast transmitter xl12 page 9-1 01 january 2002 section 9 electrical schematics introduction 9.1 this section contains electrical schematics/ logic diagrams for the subject equipment. Block diagrams, simplified electrical schematics and/or logic diagrams may be included. Refer to ...

  • Page 191

    12 000 watt am broadcast transmitter xl12 page 9-2 01 january 2002 note the physical location of a part/assembly was not necessarily a factor when a schematic was drawn. The full reference designation assigned to a part/ assembly, in conjunction with the family tree in figure 8-1 and the assembly de...

  • Page 192

    12 000 watt am broadcast transmitter xl12 page 9-3 01 january 2002 table 9-1 list of electrical schematics figure sd-1 electrical schematic - xl12 - 12 000 watt am broadcast transmitter figure sd-2 electrical schematic - exciter stage figure sd-3 electrical schematic - rf drive stage figure sd-4 ele...

  • Page 193

    Figure sd-1 electrical schematic - xl12 - 12 000 watt am broadcast transmitter page sd-1 01 january 2002.

  • Page 194

    Figure sd-2 electrical schematic - exciter stage page sd-2 01 january 2002.

  • Page 195

    Figure sd-3 electrical schematic - rf drive stage page sd-3 01 january 2002.

  • Page 196

    Figure sd-4 electrical schematic - rf power stage page sd-4 01 january 2002.

  • Page 197

    Figure sd-5 electrical schematic - control/monitor functions page sd-5 01 january 2002.

  • Page 198

    Figure sd-6 electrical schematic - ac/dc power stage page sd-6 01 january 2002.

  • Page 199

    Figure sd-7 electrical schematic - remote interface pwb (napi25a) page sd-7 01 january 2002.

  • Page 200

    Figure sd-8 electrical schematic - exciter interface pwb (napi22e) page sd-8 01 january 2002.

  • Page 201

    Figure sd-9 electrical schematic - rf drive tuning pwb (napi60) page sd-9 01 january 2002.

  • Page 202

    Figure sd-10 electrical schematic - distribution pwb (napi50b) page sd-10 01 january 2002.

  • Page 203

    Figure sd-11 electrical schematic - dc power supply pwb (naps16c) page sd-11 01 january 2002.

  • Page 204

    Figure sd-12 electrical schematic - dc power supply monitor pwb (napi48b) page sd-12 01 january 2002.

  • Page 205

    Figure sd-13 electrical schematic - rf combiner/output filter (naf101c/naf102) page sd-13 10 july 2003.

  • Page 206

    12 000 watt am broadcast transmitter xl12 page 10-1 01 january 2002 section 10 mechanical drawings introduction 10.1 this section contains assembly detail drawings for the subject equipment. Dimensional drawings may be included. Refer to table 10-1 for an itemized listing of drawings provided. Conte...

  • Page 207

    12 000 watt am broadcast transmitter xl12 page 10-2 01 january 2002 table 10-1 list of mechanical drawings figure md-1 assembly detail - xl12 12 000 watt am broadcast transmitter (top and front) figure md-2 assembly detail - xl12 12 000 watt am broadcast transmitter (rear and sides) figure md-3 asse...

  • Page 208

    Figure md-1 assembly detail - xl12 12 000 watt am broadcast transmitter (top and front) page md-1 01 january 2002.

  • Page 209

    Figure md-2 assembly detail - xl12 12 000 watt am broadcast transmitter (rear and sides) page md-2 01 january 2002.

  • Page 210

    Figure md-3 assembly detail - nac101 control/monitor panel page md-3 01 january 2002.

  • Page 211

    Figure md-4 assembly detail - napd07/01 and napd07/02 meter/switch monitor pwbs page md-4 01 january 2002.

  • Page 212

    Figure md-5 assembly detail - napi25a remote interface pwb page md-5 01 january 2002.

  • Page 213

    Figure md-6 assembly detail - nae73a exciter panel page md-6 01 january 2002.

  • Page 214

    Figure md-7 assembly detail - napi22e exciter interface pwb page md-7 01 january 2002.

  • Page 215

    Figure md-8 assembly detail - nae83 rf drive panel page md-8 01 january 2002.

  • Page 216

    Figure md-9 assembly detail - naaa02 rf drive amplifier page md-9 01 january 2002.

  • Page 217

    Figure md-10a assembly detail - napi60/01 and napi60/02 rf drive tuning pwb page md-10a 01 january 2002.

  • Page 218

    Figure md-10b assembly detail - napi60/03 and napi60/04 rf drive tuning pwb page md-10b 01 january 2002.

  • Page 219

    Figure md-11 assembly detail - naps10b regulated power supply pwb page md-11 01 january 2002.

  • Page 220

    Figure md-12 assembly detail - napi50b distribution pwb page md-12 01 january 2002.

  • Page 221

    Figure md-13 assembly detail - fan tray (p/n 183-8350) page md-13 01 january 2002.

  • Page 222

    Figure md-14 assembly detail - naf102 rf output filter (top view) page md-14 01 january 2002.

  • Page 223

    Figure md-15 assembly detail - naf102 rf output filter (rear view) page md-15 01 january 2002.

  • Page 224

    Figure md-16 assembly detail - nafp90 forward/reflected power probe page md-16 01 january 2002.

  • Page 225

    Figure md-17 assembly detail - nax161 static drain choke page md-17 01 january 2002.

  • Page 226

    Figure md-18 assembly detail - naf101 8-input rf combiner/filter (rear view) page md-18 01 january 2002.

  • Page 227

    Figure md-19 assembly detail - naf101 8-input rf combiner/filter (side view) page md-19 01 january 2002.

  • Page 228

    Figure md-20 assembly detail - napp02 rf current probe pwb page md-20 01 january 2002.

  • Page 229

    Figure md-21 assembly detail - capacitive divider assembly (176-8253) page md-21 01 january 2002.

  • Page 230

    Figure md-22 assembly detail - nax202/04 surge arrestor assembly (dwa00-555) page md-22 01 january 2002.

  • Page 231

    Figure md-23 assembly detail - nasr108 ac/dc power supply (top view) page md-23 01 january 2002.

  • Page 232

    Figure md-24 assembly detail - nasr105 & /01 power transformer assembly page md-24 01 january 2002.

  • Page 233

    Figure md-25 assembly detail - 3ø rectifier (up28) page md-25 01 january 2002.

  • Page 234

    Figure md-26 assembly detail - naps16c dc power supply pwb page md-26 01 january 2002.

  • Page 235

    Figure md-27 assembly detail - napi48b dc power supply monitor pwb page md-27 01 january 2002.

  • Page 236

    Figure md-28 dimensional information - xl12 12 000 watt am broadcast transmitter page md-28 01 january 2002.

  • Page 237

    Figure md-29 assembly/dimensional information - nax165 circuit breaker enclosure page md-29 01 january 2002.

  • Page 238

    Figure sd-13 electrical schematic - rf combiner/output filter (naf101a/naf102) page sd-13 01 january 2002.