Harris Platinum HT EL 2000HS Technical Manual Download Page 30

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Figure 2-7.

Platinum™ Series

2-12

888-2457-001

WARNING: Disconnect primary power prior to servicing.

Summary of Contents for Platinum HT EL 2000HS

Page 1: ...03 Copyright 1999 2002 2003 Harris Corporation All rights reserved I Installation II Operation III Theory of Operation IV Maintenance Alignments V Troubleshooting VI Parts List Transmitter PA Amplifier Modules VII RF Amplifier Modules TECHNICAL MANUAL HT EL2000LS HS 994 9383 001 HT EL2000LS 994 9384 001 HT EL2000HS 888 2457 001 ...

Page 2: ...CK LISTs Use the PACKING CHECK LIST to help locate and identify any components or assemblies which are removed for shipping and must be reinstalled Also remove any shipping supports straps and packing materials prior to initial turn on Technical Assistance HARRIS Technical and Troubleshooting assistance is available from HARRIS Field Service during normal business hours 8 00 AM 5 00 PM Central Tim...

Page 3: ...AL REVISION HISTORY 888 2457 001 Rev Date ECN Pages Changed 001 B 7 25 02 48420 Replaced Title Page iv and 4 6 Added MRH 1 MRH 2 888 2457 001 MRH 1 MRH 1 WARNING Disconnect primary power prior to servicing ...

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Page 5: ...und in the schematics C001 in a bill of material is equivalent to C1 on the schematic or 2 gives added information or further explanation i e Used for 208V operation only or Used for HT 10LS only etc Inside the individual tables some standard conventions are used A symbol in front of a component such as C001 under the REF SYMBOLS EXPLANATIONS column means that this item is used on or with C001 and...

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Page 7: ...ved The following National Fire Protection Association NFPA standards are recommended as reference Automatic Fire Detectors No 72E Installation Maintenance and Use of Portable Fire Extinguishers No 10 Halogenated Fire Extinguishing Agent Systems No 12A WARNING ALWAYS DISCONNECT POWER BEFORE OPENING COVERS DOORS ENCLO SURES GATES PANELS OR SHIELDS ALWAYS USE GROUNDING STICKS AND SHORT OUT HIGH VOLT...

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Page 9: ...ble e If arms or legs are affected keep them elevated NOTE If medical help will not be available within an hour and the victim is conscious and not vomiting give him a weak solution of salt and soda 1 level teaspoonful of salt and 1 2 level teaspoonful of baking soda to each quart of water neither hot or cold Allow victim to sip slowly about 4 ounces a half of glass over a period of 15 minutes Dis...

Page 10: ... Section III Operation Introduction 3 1 Controls And Indicators 3 1 Local Turn on and Turn off 3 1 Video Controlled Operation 3 1 Remote Control Extended Operation 3 1 Section IV Theory of Operation Introduction 4 1 System Overview 4 1 Exciter Meter and Control Board 4 1 A D Displays 4 1 Bar Graph Display 4 1 Analog Multiplexers 4 1 Meter Selector 4 1 Loss Of Video Delay Detector 4 2 Override Norm...

Page 11: ...cal Module Repair A 1 RF Amplifier Modules Theory of Operation A 1 Driver Module Low Band A 2 Driver Module High Band A 2 PA Module A 4 RF Quarter Modules A 4 Low Band Quarter Module A 4 High Band Quarter Module A 5 Quarter Module Bias A 5 Protection Control and Monitor Subsystem A 5 Module Status LEDs A 6 Red LED Fault Blink Codes A 6 Module Troubleshooting A 6 Platinum TV Module Test Fixture 992...

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Page 13: ...nd visual modules are interchangeable and have overdrive over undervoltage power unbalance VSWR and overtemperature protection The modules may be repaired in the field at the quarter module or component level 1 5 Power Supplies The exciter and interface logic utilize linear regulator supplies The RF module power comes from power factor corrected switching supplies in the power module assembly 1 6 ...

Page 14: ...Figure 1 1 HT EL2000 LS HS Block Diagram Platinum Series 1 2 888 2457 001 WARNING Disconnect primary power prior to servicing ...

Page 15: ...Table 1 1 Specifications Section I Introduction Specifications 888 2457 001 1 3 WARNING Disconnect primary power prior to servicing ...

Page 16: ...e signal as in Differential Gain Incidental Carrier Phase Modulation 1 5 or better Carrier phase variation from reference white to sync tip relative to blanking Luminance Non linearity 1 0 dB or better Measured with a 5 step staircase signal Test Signal 3 CCIR Rec 421 3 Equivalent Envelope Delay Compliant with CCIR system 2T Pulse K Factor 1 5 Maximum 20T Pulse 3 Maximum baseline disturbance Signa...

Page 17: ...e 60 dB RMS or better Relative to 25 kHz deviation AM Signal to Noise 55 dB RMS or better Relative to 100 amplitude modulation AM Synchronous Noise 40 dB RMS or better Relative to 100 amplitude modulation measured before optional diplexer Wideband Composite Performance At 75kHz deviation Harmonic Distortion 0 25 or less 50 Hz to 15 kHz 0 75 or less 15 kHz to 50 kHz Distortion IMD 0 5 or less SMPTE...

Page 18: ...se 50 60 Hz Regulation 10 Air System Requirements Inlet Air Openings Rear door and front power module with filters Exhaust Air Openings Amplifier cabinet top 30 x 8 and amplifier cabinet right rear side two areas 6 x 18 and 9 x 11 Exhaust Temperature 10 degrees C temperature rise above inlet Allowable Back Pressure 0 05 of water at each cabinet exhaust stack Acoustic Noise 65dB 3 feet in front of ...

Page 19: ...possible damage to com ponents and connectors Notch diplexers are generally supplied in a frame which rests on or is bolted to the floor Directional couplers for metering are in the transmitter cabinet Optional directional couplers for monitoring are on the block diagram and should be ordered with the transmitter Be sure all components necessary for installation are available on site 2 2 4 Air Sys...

Page 20: ...ssed during unpacking The carrier may also wish to examine the packing material If the contents are incomplete or if the unit is damaged electri cally or mechanically notify the Harris Customer Service De partment by phone at 217 222 8200 FAX at 217 222 9443 or at the following address Harris Corporation Broadcast Division P O Box 4290 Quincy Il 62305 Attn Customer Service Department INVENTORY OF ...

Page 21: ...r side front and rear When the cabinet is in its final position you may need to level the cabinet The HT EL cabinet has leveling jacks in the corners to aid in leveling the cabinet on un even floors The four 0 5 inch hold downs in the bottom of the cabinet used to bolt the cabinet to the shipping skid that may be used to bolt the unit to the floor Level the cabinet using shims under the bottom thi...

Page 22: ...aural Aural Input Dual Sound Audio 2 MONO AUR 2 XLR J8 J18 NICAM Reference BNC J9 J19 NICAM IF In BNC J10 J20 Option Access BNC J21 Remote Command Input 37 Pin D J22 Remote Status Output 37 Pin D J23 Remote Analog Output 37 Pin D Table 2 2 Input Signals Remote Conrol I O 1A2 Exciter Meter Control Board JP POSITION FUNCTION AS SHIPPED JP1 1 2 Loss of video enabled JP2 1 2 Remote control of aural gr...

Page 23: ...MITTER FOR AC POWER SHORTS LOOSE HARDWARE WIRING ERRORS UNCONNECTED WIRES MISSING PARTS AND DEBRIS 2 6 2 Initial Turn on Sequence The following procedures are the sequential steps to safely turn on the transmitter and must be performed in the order listed It is recommended that the installation personnel read the general description in section one the controls and operation material in section thr...

Page 24: ... of modulation Differential gain Incidental phase ICPM Differential phase Amplitude response and group delay compensation Exciter Group Delay Compensator and Notch Diplexer Equalizer adjustments Power limit Frequency 2 6 6 Aural a Slowly apply aural exciter drive while watching VSWR and FORWARD power If a notch diplexer or hybrid output combiner is used check its reject load power as well Stop at ...

Page 25: ...status of the external interlock If the interlock is open a low will be asserted RF MUTE Exciter mute Indicates that some function has muted the exciter Asserted low for mute EXCITER FAULT Indicates exciter fault directly in single exciter configuration Asserted low for fault SUPPLY FAULT Indicates the 50 volt power supply has failed Asserted low upon fault MODULE FAULT Indicates one or more of th...

Page 26: ...Figure 2 3 Platinum Series 2 8 888 2457 001 WARNING Disconnect primary power prior to servicing ...

Page 27: ...Figure 2 4 Section II Installation 888 2457 001 2 9 WARNING Disconnect primary power prior to servicing ...

Page 28: ...Figure 2 5 Platinum Series 2 10 888 2457 001 WARNING Disconnect primary power prior to servicing ...

Page 29: ...Figure 2 6 Section II Installation 888 2457 001 2 11 WARNING Disconnect primary power prior to servicing ...

Page 30: ...Figure 2 7 Platinum Series 2 12 888 2457 001 WARNING Disconnect primary power prior to servicing ...

Page 31: ...Figure 2 8 Section II Installation 888 2457 001 2 13 WARNING Disconnect primary power prior to servicing ...

Page 32: ...Figure 2 9 Platinum Series 2 14 888 2457 001 WARNING Disconnect primary power prior to servicing ...

Page 33: ...Figure 2 10 Section II Installation 888 2457 001 2 15 WARNING Disconnect primary power prior to servicing ...

Page 34: ...Figure 2 11 Platinum Series 2 16 888 2457 001 WARNING Disconnect primary power prior to servicing ...

Page 35: ... VIS FWD on the multimeter and press visual raise up arrow or visual lower down arrow button to set the visual power output level Next select aural output power AUR FWD on the multimeter and press aural raise up arrow or lower down arrow to set the power output level If the transmitter is to be operated by remote control press REMOTE button to enable the command remote control inputs To turn trans...

Page 36: ...Figure 3 1 Transmitter Controls and Indicators Platinum Series 3 2 888 2457 001 WARNING Disconnect primary power prior to servicing ...

Page 37: ... ON indicates AC power to Exciter 18 EXTERNAL INTERLOCK When ON indicates external interlock OPEN 19 50V SUPPLY FAULT When ON indicates power supply fault condition 20 MODULE FAULT When ON indicates one or more of the modules has a fault condition 21 AIR FAULT When ON indicates loss of air 22 HIGH VSWR When ON indicates a high VSWR condition 24 RF MUTED When ON indicates RF Output of Exciter is mu...

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Page 39: ...he analog metering section The meter is a digital 4 1 2 digit A D convertor with multiplexed binary coded decimal BCD outputs This is followed by a BCD to seven segment display decoder and LED displays The A D U1 can display 0000 to 9999 on the digital displays DS1 and DS2 and is updated about 5 times a second The display is normally calibrated for 2000 when the Bar Graph is at full scale or 1 25 ...

Page 40: ...ssing an UP or DOWN button U18 or U19 pin 23 PWR_CLK will issue one pulse then wait for 2 seconds and start issuing a 300Hz clock rate if the button is still pressed IC U18 also generates a 9 5Hz clock used by the METER CLOCK GATE U20 which operates similar to U18 U19 but at a slower one pulse per 1 17 second rate to clock U17 METER SELECT 4 bit counter Oscillator U22 is running about 77 6kHz and ...

Page 41: ...L when the meter UP or DOWN button ispressed otherwisethe counter rests at 0 count The RAISE LOWER COMMANDS are debounced by the 105ms clock and passed on to the POWER UP DOWN output pins VISUAL STAY output is asserted Hi if neither VISUAL RAISE or LOWER buttons are pressed This signal is used by the visual power control PALs U26 U27 AURAL STAY output is asserted Hi if neither AURAL RAISE or LOWER...

Page 42: ...ION 1 IN 840MS CLOCK TO ALL REGISTERS 2 IN METER UP COMMAND 3 IN METER DOWN COMMAND 4 IN RESET 5 IN VISUAL IF OSCILLATOR UNLOCK 6 IN MASTER OSCILLATOR UNLOCK 7 IN AURAL IF OSCILLATOR UNLOCK 8 13 IN NOT USED 14 OUT ENABLE CURRENT METER MUX 15 OUT ENABLE VOLTAGE METER MUX 16 OUT TURN ON DECIMAL POINT 1 17 OUT TURN ON DECIMAL POINT 2 18 OUT TURN ON DECIMAL POINT 3 19 OUT METER SELECT COUNTER BIT 0 20...

Page 43: ...duce outputs as detailed below See Table 4 5 for U19 Input Output Functions 4 4 4 3 50V OK This circuit monitors the 50 volt supply and the comparator output will go low when the supply reaches 48 volts At this point the modules can be enabled and the transmitter is operational INPUTS PIN NO NAME FUNCTION 1 CLK Clock register 2 ON Local transmitter ON command 3 OFF Local transmitter OFF command 4 ...

Page 44: ...f each 50 volt power supply and provides a summary fault signal to the interface logic assembly 1A7 Additionally the 5V P S fault signal is conditioned to interfaceto the 12V logic input of the interface logic U15 INPUT FUNCTION PINS NAME FUNCTION 1 CLK CLOCK REGISTER 2 TX_ON XMTR IN AUTO ON MOTE 3 MOD_RESET RESET THE RF MODULES 4 MOD1F MODULE FAULT IF HI 5 MOD2F MODULE FAULT IF HI 6 MOD3F MODULE ...

Page 45: ...1A7A3 PC boards for all three voltages and should be set to deliver 5V 0 1V and 12V 0 3V on the Interface Logic board at 1A7 U19 INPUTS 1 CLOCK LOGIC CLOCK 2 VIS_HI_VSWR 3 AUR_HI_VSWR 4 VIS_FB_ACT 5 AUR_FB_ACT 6 INTERLOCK 7 LOSS_OF_VID 8 50V_OK 9 TX_ON 10 DC_OK 11 PRESS_ON 13 DELAY U19 OUTPUTS 18 AGC_DISABLE Reduces AGC output to a safe drive level when A PRESS_ON 50V_OK are low B 50v_ok is low LO...

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Page 47: ...age is exposed The information and procedures in this section is to be used by trained and experienced personnel Good judgement alertness and common sense are the best accident preventives 5 3 Preventive Maintenance Preventive maintenance is a systematic series of operations per formed periodically on equipment As these procedures cannot be applied indiscriminately specific instructions are necess...

Page 48: ...ting Discolored cracked or chipped com ponents indicate a possible overload b When replacing a resistor ensure the replacement value corresponds to the component designated by the schematic diagram c Clean dirty resistors with a small brush 5 3 3 3 Transformers Preventative maintenance of transformers is accomplished by performing the following a Feel each transformer soon after power removal for ...

Page 49: ...current shunt and meter if recalibaration is needed a Select PS CURRENT on the Exciter Meter b On the Exciter Meter set R2 PA I CAL to match the measured current on the Bar Graph The Bar Graph reads 120 A full scale 20 segments c Adjust R94 PA I CAL for numeric indication the same as the measured current 5 7 2 Exciter RF Output Meter Calibration 5 7 2 1 Exciter Visual Power Calibration a Connect a...

Page 50: ...d Aural Exciter output to zero c Place JP1 and JP2 in 2 3 position to disable foldback 5 7 4 2 Visual High VSWR Adjustment a Move the coax cable 1A7P7 from 1A7J7 to 1A7J8 b Select the VIS REF meter position c Turn on the transmitter and slowly increase visual output power until the VIS REF meter reads 200 watts This is the level for a VSWR of 2 0 1 d Adjust R69 VIS HIGH VSWR on 1A7 Interface logic...

Page 51: ...Preset R176 fully CW b Turn OFF the AC circuit breaker for one of the power supplies c Adjust R176 for a AURAL power output of 15 watts peak of sync d Turn ON the AC circuit breaker and the aural power should return to 200 watts 5 1 5 9 Component Replacement On Circuit Boards The circuit boards used in the VHF TV exciter are double sided circuit boards with plated through holes Soldering on this c...

Page 52: ...on swab moistened with a suitable solvent Rubbing alcohol is highly diluted with water and is not effective Solvents are available at electronic supply houses which are useful The circuit board should be checked to ensure that the flux has been removed from the circuit board and not just smeared about Rosin flux is not normally corrosive but rosin can absorb enough moisture in time to become condu...

Page 53: ...equence of events meter readings revision level of circuit boards 6 3 Returns To return material to Harris under warranty a return authoriza tion number must be obtained from the Harris Customer Service Department prior to returning any unit for any reason A return authorization will assure speedy and accurate handling of your return A written description including the following information must a...

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Page 55: ...0 001 F 7 5 Table 7 9 EXCITER SWITCHER HTEL2000 992 9272 001 J 7 5 Table 7 10 KIT FORMAT PARTS HTEL2000HS 992 9511 592 B 7 6 Table 7 11 CABINET HTEL 2000 992 8610 004 AR 7 7 Table 7 12 PWA MOV AC 198 250 VAC 992 8553 001 E1 7 8 Table 7 13 POWER MODULE HTEL 2000 992 8612 010 E 7 8 Table 7 14 PWA SUPPLY FAULT DISPLAY 992 9511 418 A 7 9 Table 7 15 INTERFACE MODULE 992 8613 003 E 7 9 Table 7 16 BD INT...

Page 56: ...5 005 KIT INSTALL HTEL2000 120V 0 EA W 120V SOLDERING IRON 992 8788 001 KIT SPARE PWB 0001 EA SPARE BOARDS KIT OPTION QTY 1 REQ D IF ORDERED 992 8895 000 VIS COMB 3 WAY SELECT 0 EA 1A18A3 QTY 1 REQUIRED OXX CHANNEL 992 8908 000 VIS DIV 3 WAY 1 5 8 SELCT 0 EA 1A18A1 QTY 1 REQUIRED XXX CHANNEL 992 8950 002 EXTENDER POWER MODULE 0 EA OPTIONAL 992 8965 000 RF DRV PA MOD 525W ASSY 0 EA PLATINUM 3 MODUL...

Page 57: ...OLDERING IRON 992 8755 005 KIT INSTALL HTEL2000 120V 0 EA W 120V SOLDERING IRON 992 8788 001 KIT SPARE PWB 0 EA SPARE BOARDS KIT OPTION QTY 1 REQ D IF ORDERED 992 8895 000 VIS COMB 3 WAY SELECT 0 EA OXX CHANNEL 1A18A3 QTY 1 REQUIRED 992 8908 000 VIS DIV 3 WAY 1 5 8 SELCT 0 EA 1A18A1 QTY 1 REQUIRED XXX CHANNEL 992 8950 002 EXTENDER POWER MODULE 0 EA OPTIONAL 992 8965 000 RF DRV PA MOD 525W ASSY 0 E...

Page 58: ...5 KIT EXT LO SINGLE EXCITER 992 9511 251 B Harris PN Description QTY UM Reference Designators 200000000000000351COVER POWER SUPPLY 1 EA 620 0124 000 ADAPTER BNC UG306U 1 EA 1A19 OUTPUT 620 0455 000 ADPT BNC UG492A U 1 EA 1A12J10 736 0282 000 POWER SUPPLY SWITCHING 1 EA 839 7900 151 BRACKET PREAMP MTG 1 917 2100 250 CABLE PS PREAMP 1 EA 917 2315 283 CABLE LO POWER SUPPLY 1 EA 917 2465 007 CABLE RG ...

Page 59: ... EXT DRAWER 1 PR 358 3372 000 CABLE CARRIER 1 EA 448 0973 000 LATCH SWELL 083 SERIES 2 EA 610 0762 000 PLUG 37 PIN 1 EA 610 0836 000 HOUSING PLUG 6 POS 1 EA 620 0547 000 ADAPTER BNC TO N UG201A U 2 EA 620 2546 000 RF TRANSFER SWITCH 2 EA K001 K002 700 0116 000 RES LOAD 50 OHM 2W 2 EA RL001 RL002 917 2100 081 CABLE RF JUMPER 4 EA 917 2506 128 CABLE WIRE 1 00 EA 939 1250 003 R F DETECTOR ASSY 4 EA D...

Page 60: ...RK 10K OHM 2 2 EA R021 R045 540 1417 000 RES NETWORK 1500 OHM 2 3 EA R011 R022 R032 540 1494 000 RES NETWORK 1 8K 8 DIP 1 EA R046 548 2400 169 RES 51 1 OHM 1 2W 1 1 EA R029 548 2400 401 RES 10K OHM 1 2W 1 8 EA R013 R019 R025 R027 R039 R040 R041 R042 548 2400 701 RES 10MEG OHM 1 2W 1 4 EA R007 R012 R020 R024 550 1035 000 TRIMPOT 5K OHM 1 2W 10 4 EA R026 R028 R030 R031 574 0156 000 RELAY 12VDC 4PDT ...

Page 61: ... 2 POLE 2 AMP 277VAC 1 EA 1A1CB4 606 0908 000 CB 2 POLE 5 AMP 277VAC 1 EA 1A1CB3 614 0046 000 TERM BD 2 TERM 1 EA 1A18TB1 614 0050 000 TERM BD 6 TERM 1 EA 1A18TB3 614 0872 000 BARRIER BLOCK 3 POLE 1X4 1 EA 1A14TB1 620 0662 000 COUPLING SLEEVE 1 5 8 1 EA 646 1353 000 NAMEPLATE XMTR EQUIPMENT 1 646 1483 000 HARRIS NAMEPLATE 1 822 0900 016 PIN ALIGNMENT 10 939 8115 006 BRACKET CABLE RETRACTOR 1 EA 94...

Page 62: ...e 7 13 POWER MODULE HTEL 2000 992 8612 010 E Harris PN Description QTY UM Reference Designators 041 6030 014 CHANNEL 1 16 MTL 3 150 FT 358 0002 000 BRACKET RESISTOR MTG 2 EA 1A11R1 358 2598 000 CABLE TIE MOUNT 4 WAY 5 EA 384 0431 000 RECT 1N4001 ESD 1 EA 1A11CR1 404 0578 000 SOCKET RELAY 4PDT 1 EA 1A11K2 424 0598 000 BUSHING SPLIT GUIDE PIN 2 EA 448 0970 000 HANDLE ALUM 2 EA 524 0355 000 CAP 120 0...

Page 63: ...ROW STRT POL 1 EA J001 612 1184 000 SHUNT JUMPER 0 1 CENTERS 1 EA JPR001 843 5275 441 SCH SUPPLY FAULT DISPLAY 0 843 5275 443 PWB SUPPLY FAULT DISPLAY 1 Table 7 15 INTERFACE MODULE 992 8613 003 E Harris PN Description QTY UM Reference Designators 026 6010 001 NYLON PROFILE 500 WIDE 1 260 FT INSERT ON REAR HORIZONTAL EDGE OF CHASSIS 041 6030 014 CHANNEL 1 16 MTL 1 680 FT 358 3283 000 SLIDE FULL EXT...

Page 64: ...XU034 404 0797 000 SOCKET DIP 24 PIN DL 3 EA XU008 XU015 XU019 404 0825 000 SOCKET DIP16 LO PROFILE 3 EA XK001 XK002 XK003 478 0392 000 XFMR RF MODEL T4 1 4 EA T001 T002 T003 T004 494 0398 000 CHOKE RF 10 0UH 10 4 EA L001 L002 L003 L004 500 0836 000 CAP MICA 500PF 500V 1 EA C022 515 0147 000 CAP 15PF 200V 5 1206 COG 4 EA C003 C004 C011 C012 516 0453 000 CAP 1UF 100V 20 X7R 41 EA C023 C024 C025 C02...

Page 65: ... R158 R170 548 2400 404 RES 10 7K OHM 1 2W 1 2 EA R123 R133 548 2400 405 RES 11K OHM 1 2W 1 2 EA R098 R111 548 2400 418 RES 15K OHM 1 2W 1 1 EA R081 548 2400 426 RES 18 2K OHM 1 2W 1 1 EA R167 548 2400 434 RES 22 1K OHM 1 2W 1 1 EA R169 548 2400 442 RES 26 7K OHM 1 2W 1 1 EA R090 548 2400 451 RES 33 2K OHM 1 2W 1 1 EA R082 548 2400 466 RES 47 5K OHM 1 2W 1 2 EA R117 R119 548 2400 473 RES 56 2K OHM...

Page 66: ...A CR001 CR002 CR003 CR004 494 0389 000 CHOKE RF 2 70UH 2 EA L001 L002 516 0530 000 CAP 01UF 10 100V X7R 6 EA C002 C003 C004 C006 C007 C008 526 0342 000 CAP 2 7UF 35V 10 2 EA C001 C005 548 2400 169 RES 51 1 OHM 1 2W 1 2 EA R006 R008 548 2400 301 RES 1K OHM 1 2W 1 2 EA R003 R004 548 2400 342 RES 2 67K OHM 1 2W 1 2 EA R001 R009 548 2400 501 RES 100K OHM 1 2W 1 2 EA R005 R007 550 0947 000 TRIMPOT 1K O...

Page 67: ...latinum Series transmitter Driver Modules are multiple stage high gain RF amplifiers used primarily to amplify an exciter output and drive sub sequent amplifier stages 525 Watt PA Modules are built in driver module configura tion High band modules are biased class A for the two series configured quarter modules and class AB for the two parallel output quarter modules Low band modules are biased cl...

Page 68: ...sample to the module s protec tion control and monitor PCM system On the input and output Driver RF Intraconnection assemblies are provided optional capacitors for response correction On the input assembly A5A4 are C1 and C15 On the driver RF intraconnect assembly is C4 A capacitor may be added where needed for frequency response correction and or input matching The low band driver s output is rat...

Page 69: ...oupler to the module output The directional coupler provides a reflected power sample to the module s protection control and monitor PCM system On the input and output Driver RF Intraconnection assemblies are provisions for response correction On the A5A6 assembly are C4 and C12 On the A5A4 RF intraconnection assembly is C13 On the two way divider RF Intraconnection assembly is C14 These capacitor...

Page 70: ... on with application of 50 Volts to the quarter modules The quarter module supplies voltages representing temperature and ISO voltage to the module PCM system For any given channel class A and class AB amplifier blocks use the samequartermodulecircuit Thebiasvoltageadjustmentpoten tiometer controls the quiescent drain current for each FET which determines each quarter module s class of operation I...

Page 71: ...rnished by a step down regulator in the Protection Monitoring and Control Subsystem This regulated voltage switches with the switched 50 Volts Thermistor R1 is mounted to the heat sink between RF FETS Q2 and Q3 and completes a resistive voltage divider betewwn the 15 Volts and ground As the hestsink temperature increases the resistance of the thermistor decreases The change in thermistor resistanc...

Page 72: ...This switched 50 Volts is reduced to 15 Volts by regulator U10 The 15 is supplied to each module to be used for temperature sensing and FET biasing The logic will not allow the module to enable if a fault condition exists to protect the module from damage A 2 9 Module Status LEDs Each module uses two front panel LEDs to display its current operating status The LEDs are driven by signals from the P...

Page 73: ...Enable switch S1 allows local control of the module on the extender while the transmitter is on CAUTION AN EXTERNAL RF LOAD MUST BE CONNECTED TO THE MOD ULE AT ALL TIMES DURING TEST BE SURE TO DISABLE AND REMOVE THE MODULE OR TURN OFF THE BREAKER BEFORE REMOVING THE EXTENDER FROM THE CABINET A 3 2 Troubleshooting Based on Module Swapping Many situations exist in which a problem exhibited by a modu...

Page 74: ...ault 1 blink The cause for this fault is often external to the module First check the system VSWR on the display panel and check for a VSWR foldback or VSWR overload condition on the transmitter Check the other modules in the same cabinet for VSWR faults as well If either is found suspect a problem in the system outside the cabinets If not then the problem is either in the suspect module or its ca...

Page 75: ...g off bias to each FET one at a time with the bias adjustment pots Record the current after turning each pot off and look for one or more FETs whose bias current is zero or lower than the others If no quarter modules or FETs indicate low bias current there are two possibilities either a shorted open or damaged compo nent on a quarter module or a problem with the PCM logic board Try to rule out a p...

Page 76: ...ed by measuring the resistance from the red 50 Volt wire of any quarter module to the 50 Volt pins of the input connector with an ohmmeter If open pass FETs are suspected check the voltage at collector case of Q1 of the Module Control Board as the module is enabled and disabled This voltage is fed through resistance to the gate of the pass FETs When Q1 collector is high enabled 50 Volts should app...

Page 77: ...er a load resistor should still be placed at the module output to prevent oscillation Starting with the first quarter module nearest the logic board and working toward the front handle measure the total idle current of each quarter module in turn Either insert a current meter in line with the 50 Volt wire at TB1 or use a clamp on DC current meter if available With no RF drive applied apply 50 Volt...

Page 78: ...ss and best mechanical strength For all other joints use SN 63 PB 37 for its low melting point b Always use electrical solder with a rosin flux Never use plumbing solder or acid fluxes which can cause copper to corrode Start with clean tinned leads which will mini mize the need for flux If it is necessary to use additional flux use as little as possible Figure A 6 Quarter Module RF FET Bias Pots P...

Page 79: ...E TO ALL FOUR FET POSITIONS ON THE QUARTER MODULE BEFORE INSTALLING THE NEW FETS IMPORTANT WHEN CLEANING THE OLD THERMAL COMPOUND FROM UN DERNEATH THE FET AFTER REMOVAL USE A SWAB WITH JUST ENOUGH SOLVENT TO CLEAN THE SURFACE DO NOT USE TOO MUCH SOLVENT AND DO NOT USE AN AEROSOL SPRAY CLEANER AS EITHER MAY SEEP UNDERNEATH NEARBY FETS AND DISSOLVE THE THERMAL COMPOUND FROM UNDER THEM CAUSING PREMAT...

Page 80: ...ly concave the heat sink compound should be thickest in the center There should be excess heat sink compound on the blade Carefully wipe the excess compound off on a clean cloth do NOT try to re use this compound g Place FET firmly into the holes of the PC board Try to pull the FET up applying moderate force If the FET resists being pulled up it is well seated If it is easily pulled up clean both ...

Page 81: ...e can be applied Enable module with MODULE ENABLE switch on test fixture Red LED will extinguish On PA modules one half of green LED will illuminate On driver modules both halves of green LED will be on Note the current reading of the quarter module Compare this reading to the values found in the Table A 1 located at the end of this section Check all four quarter modules If quarter module currents...

Page 82: ...aults The module should trip off between 1 7 and 2 1 Volts A 5 2 4 Overdrive Check Perform this check only after verifying that the module gain adjustment is correct See paragraph on Gain Check located elsewhere in this section Pre set the Overdrive Pot R101 fully clockwise Set the input drive on the aural frequency per the following MODULE TYPE DRIVE LEVEL TRIP TOLERANCE High Band PA 120 Watts 2 ...

Page 83: ... reference At the reflected sample feedthrough or at the anode of CR1 inject a DC voltage Slowly increase the voltage until the module faults It should trip at a voltage 0 84 times the reference 10 To adjust the trip threshold set the injected voltage to 0 84 times the forward reference and adjust R101 until the module faults off This accounts for the 6 dB pad on the forward sample line and scales...

Page 84: ...Table A 1 Summary of Module Specifications Platinum Series A 18 888 2457 001 WARNING Disconnect primary power prior to servcing ...

Page 85: ...Table A 2 Input Attenuators Driver Appendix A RF Amplifier Modules 888 2457 001 A 19 WARNING Disconnect primary power prior to servcing ...

Page 86: ...Table A 3 30 Watt Attenuators Platinum Series A 20 888 2457 001 WARNING Disconnect primary power prior to servcing ...

Page 87: ...nerated by equipment and personnel in the air conditioned area Again we recommend consulting profes sionals experienced in the area of HVAC design to ensure satis factory results FACTOR ITEM BTU PER HOUR LOAD EXTERIOR OR WALL AREAS EXCLUDING WINDOWS 5 to 11 BTU hour square foot dependent on sun exposure INSULATING GLASS NO COVER 22 to 77 BTU hour square foot dependent on sun exposure INSULATING GL...

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Page 89: ...ng on ground wires or adjacent wiring Thus all ground wiring must be low in impedance as well as low in resistance without splices and as direct as possible Four basic grounds are required a AC ground b DC ground c Earth ground d RF ground C 2 1 Ground Wires Ground wires should be at least as large as specified by the local electrical code These leads must be low impedance direct runs as short as ...

Page 90: ...es 0 5 meters The ground rods should be copper clad steel a minimum of eight feet 2 5 meters in length and spaced apart not more than twice the rod length Brazing or welding should be used for permanent connections between these items Where a resistance of 10 ohms cannot be obtained with the above configuration alternate methods must be considered Ideally the best building ground plane is an equip...

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