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Harris Platinum Series, Technical Manual

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The final reject load for the combined aural cabinets may be
calibrated by energizing aural PA cabinet “A” at 3 kW (or 6 kW for
20% aural power option) and adjust calibrate control R-103 on the
main controller for 2.5 volts at TP-7. The front panel display page
indicating the reject load powers should then read 1.5 kW (or 3 kW
for 20% aural option) on the appropriate aural meter page.

5.16

AGC Setup

The transmitter should be operating at normal ambient tempera-
ture and warmed up approximately 30 minutes. This procedure
is the same for visual and aural.

NOTE

The twelve turn potentiometers used for EXC ADJUST and SET

can be from different manufactures. Electrically they have the
same value but differ in the direction the control is rotated to
increase the voltage.

a. Reduce exciter power to zero, and switch AGC MODE

switch to OFF.

b. Increase exciter power for 100% transmitter power output.

c. Measure the exciter sample at the EXC test point. The

value should be between 1.2 and 1.5 volts DC.

d. Rotate the EXC ADJUST pot on top of AGC card to bring

the voltage within this range if needed.

e. Measure the transmitter sample at test point TX, and adjust SET

pot for the same or slightly less voltage that the exciter sample.

NOTE

It may be necessary to add or delete attenuation pad(s) in trans-
mitter sample line to obtain proper voltage.

f. Reduce transmitter power to zero.

g. Switch AGC MODE switch to ON.

h. Increase exciter power until transmitter power is 100%.

i. Adjust SET pot to reduce transmitter power to about 70%

for room temperatures near 70°F. If room temperature is
near 110°F adjust to 95%, and if near 50°F adjust for 65%.

j. Increase exciter drive to 100% power.

If there are problems with module overdrive faults when turning
ON the transmitter when the room is cold, adjust SET pot for less
power reduction.

If the transmitter sample voltage is much less than the exciter
sample, there may not be enough range for power reduction
adjustment.

NOTE

If adjusting the visual AGC changed the drive level, check adjust-
ment of the exciter precorrection for differential gain, ICPM, and
differential phase. Refer to the exciter manual.

5.17

Monitor Configuration Switches

Two eight-bit configuration switches on the monitor board are
used to configure the monitor system for use in a given transmit-
ter model. See Table 5-7 on page 5-11.

5.18

Lamp Test

The Main Controller board has a press-to-test switch to turn on
all Fault Status Indicator lamps.

5.19

AC Line Sample Calibration

The monitor board has three controls for calibration of the line
voltage readings. They are located just above and to the right of
the battery on the Monitor board.

WARNING

WHEN MEASURING THE LINE VOLTAGES, REMOVE ALL
POWER FROM THE CABINET, ATTACH THE TEST PROBES,
CLOSE THE CABINET, AND RE-ENERGIZE THE POWER TO
THE CABINET.

Measure line voltage at line sample kits. Adjust R-90 for phase
A-B to read the correct voltage on the display panel line infor-
mation screen.

Adjust R-91 for phase B-C, and R-92 for phase AC.

5.20

Slave Addressing

If the Slave Controller board is replaced or swapped for trou-
bleshooting purposes, the address must be set using S1. Ad-
dresses are shown in Table 5-6.

5.21

Slave Analog Channels Calibration

Disconnect the cable at J-6 on the slave controller. Measure the
voltage at pins 3 and 4, then reconnect the cable.

Call up the supply information page on the display panel, and
adjust R-46 to calibrate the PS-1 current reading to 100 amps per
1 volt measured.

Check that the other analog functions are being correctly dis-
played. The ratio of sample voltage to displayed supply voltage
value is 2.5 V with the cable removed = 50 V on the display.

J-6 functions

1-2 PS-1 volts
3-4 PS-1 current
5-6 PS-2 volts
7-8 PS-2 current

5.22

VSWR Protection Adjustments

5.22.1

Foldback

VSWR Foldback provides protection for the external RF system,
hybrids, diplexers, filters, reject loads, as well as the Gysel
combiners and the Gysel combiner reject loads. It is recom-

5-12

888-2365-001

Rev. B: 1/11/1999

WARNING: Disconnect primary power prior to servicing.

Summary of Contents for Platinum Series

Page 1: ...T M No 888 2365 001 Printed 1995 Rev C 8 24 2000 1994 1995 1997 1998 1999 2000 Harris Corporation All rights reserved TECHNICAL MANUAL Platinum Series Television Transmitters 988 2365 001 ...

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

Page 3: ...RH 1 MRH 2 and pages 7 13 7 14 001 A2 12 16 97 42056 Replaced Title Page MRH 1 MRH 2 and pages 7 15 7 21 001 A2 06 19 98 42231 Replaced Title Page MRH 1 MRH 2 and pages 7 15 to 7 17 and 7 21 to 7 23 001 B 01 11 99 42538A Replaced Title Page MRH 1 MRH 2 and pages iv v 3 9 and all of Section V 001 C 08 24 00 46385 Delete SENTINEL references pp2 5 2 6 Reword 2 12 3 h and add Caution text 888 2365 001...

Page 4: ......

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...

Page 6: ......

Page 7: ...ction 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 VOLTAGE POINTS BEFORE SERVICING NEVER MAK...

Page 8: ...ii 888 2365 001 02 24 97 WARNING Disconnect primary power prior to servicing ...

Page 9: ...ep 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 Discon tinue fluid if vomiting occurs Do...

Page 10: ... Check Out 2 9 Initial Application of RF Power 2 9 Visual 2 9 Aural 2 10 SECTION III OPERATION CONTROLS AND INDICATORS Control Cabinet 3 1 Cabinet Circuit Breaker 3 1 Front Panel Pushbutton Switches 3 1 Fault Status Indicators 3 1 User Display Panel 3 2 Detailed Screen Descriptions 3 4 Exciter Switcher Optional 3 13 AGC Module 3 14 Phase and Gain Module 3 15 Exciter Operation 3 17 Controls and Ind...

Page 11: ...ifier Modules Platinum Series General Information A 1 Factory Module Repair A 1 Local 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 Module Tro...

Page 12: ...This page left blank intentionally ...

Page 13: ...vates the AC contactor through commands from the slave controller 1 2 2 Transmitter Control System See Figure 1 5 The control system for the transmitter consists of a main controller mounted in the control cabinet plus individ ual slave controllers mounted in each amplifier cabinet Data from the system is interfaced through the monitor board to the display controller and shown on the front panel f...

Page 14: ...rol Cabinet Figure 1 2 Location of I O Panel TB1 at Rear of Control Cabinet Figure 1 3 Location of CB1 and CB2 at Front of PA Cabinet s Figure 1 4 Location of K1 at Rear of PA Cabinet s 1 2 888 2365 001 WARNING Disconnect primary power prior to servicing ...

Page 15: ...tage amplifiers consisting of paralleled class AB amplifiers in both high and low band transmitters 1 2 8 2 Driver Modules Driver modules provide high gain Primarily used in preamp applications to drive PAs they are also used as aural final amplifiers in low power applications Driver modules are keyed so that they cannot be plugged into a PA slot Low band drivers contain two cascaded class A stage...

Page 16: ... In a 20 kW system the AGC module feeds a phase and gain module whose outputs feed two 10 kW visual cabinets like those described above A 3 dB quadrature hybrid then combines the two cabinet outputs 15 kW standard In a 15 kW system the AGC module s output feeds a driver module which drives a PA module In a low band transmitter the PA s output is split in a 16 way divider whose outputs feed 16 PA m...

Page 17: ...ignal is mixed up to channel with the same LO as used in the visual chain and is bandpass filtered and amplified becoming the exciter output 1 2 10 3 AGC Module As in the visual path the exciter switcher output or single exciter feeds an AGC module which holds the aural transmitter gain constant by controlling aural RF drive based on samples of exciter drive and transmitter aural output 1 2 10 4 P...

Page 18: ...en fed to two preamps In low band transmitters the preamps are not necessary Each of the two outputs feeds a driver module The driver outputs are each split in four way dividers for a total of eight outputs and the outputs drive an array of eight PA modules The PA outputs pass to four way power combiners whose outputs are combined in a 3 dB quadrature hybrid used as a two way combiner The combined...

Page 19: ...B or better B PAL and B SECAM 1 25 MHz and lower 20 dB or better 4 43 MHz 30 dB or better 0 75 to 5 0 MHz 0 5 dB 5 5 MHz 30 dB or better Frequency Response vs Brightness 0 75 dB or better Measured using a 20 p p swept video modulation on a pedestal at 10 50 and 90 APL all percentages relative to a blanking to white excursion Differential Gain 3 or better Measured with a 5 step staircase signal fro...

Page 20: ...of optional notch or hybrid diplexer RF Output Impedance 50 Ohms Connector 1 10 kW models Type N female 15 30 kW models 15 8 EIA 10 aural HT45LS and HT60LS 15 8 EIA All other 45 60 kW models 31 8 EIA Audio Performance Inputs 1 Monaural Performance based on 25 kHz peak deviation 75 uS pre emphasis Measurements taken after de emphasis Level 0 to 16 dBm adjustable Impedance 600 Ohms balanced Pre emph...

Page 21: ... 305 m above sea level Altitude 0 to 10 000 feet 3 084 meters above sea level Ambient Humidity 0 to 95 relative humidity non condensing Power Requirements Input 208 240 volts 10 3 phase 50 60 Hz or 380 415 volts 10 3 phase 50 Hz Single phase optional on 1 kW 2 kW Regulation 10 or better no load to full load Phase Unbalance 3 maximum Air System Requirements Inlet Air Openings Rear doors Exhaust Air...

Page 22: ...1 10 888 2365 001 WARNING Disconnect primary power prior to servicing ...

Page 23: ... and AGC One or more hybrid visual combiners are present in multiple cabinet systems All other RF line components are purchased separately Be sure to obtain all components necessary for your installation 2 2 4 Air System The Transmitter Outline drawing shows a typical exhaust duct and blower system and the total transmitter requirement for cooling air The minimum ceiling height to properly handle ...

Page 24: ...p ment and other loads These loads should not be connected to the secondary of the isolation transformer used for the transmitter Branch circuits should terminate within six feet of peripheral equipment 2 2 9 Disconnect Location The circuit breaker panel should be located near the transmitter in a well lighted area As a safety precaution controls for discon necting the main power service supplying...

Page 25: ... gloves should support the door while the third person removes the hinge pins starting at the bottom and working up Then the door may be set aside and rollers pipe and a ramp used to remove the cabinet from the skid CAUTION Slide cabinet off to the front or back of skid NOT THE SIDE to avoid bending bottom panel Then replace the door after the cabinet is set in place Have two people position the d...

Page 26: ...blesin thistray Itmay beplasticormetal and attached to the top of the cabinet with screws or bolts Run the cables from the control cabinet through the cable tray to each PA cabinet On the monitor bus cable flat ribbon cable be sure to insert pin 1 of the cable into socket 1 of the jack The cable terminator must be installed in the last PA cabinet again paying close attention to pin numbers The RF ...

Page 27: ...WER LOWER 7 SELECT EXCITER A OPT 8 SELECT EXCITER B OPT 9 SELECT MANUAL OPT 10 SELECT AUTO OPT 11 SELECT COMPOSITE 12 18 NO CONNECTION 20 36 GROUNDS 19 37 EXTERNAL SUPPLY from J31 19 37 J20 2 3 The functions marked OPT are supplied when the optional exciter switcher is installed Command Functions TRANSMITTER ON Turns transmitter on and enables RF output TRANSMITTER OFF Turns transmitter off and di...

Page 28: ... panel provide both calibrated and un calibrated readingsfor some functions Thecalibratedoutputs are a function of the monitoring system The raw outputs come directly from the RF peak detectors Each output is buffered by a voltage follower with a 1 kOhm resistor in series with the signal before leaving the main controller board J33 CALIBRATED OUTPUTS RANGE 1 VIS FORWARD POWER 0 3 0 VOLTS 0 100 2 V...

Page 29: ...r 12V j Check the meter display for the correct AC voltage read ings From the bar graph press METER then press LINE Press EXIT when done k Set the time and date on the display Press SETUP then TIME Refer to section three for additional information on date time entry if needed Press EXIT once when done l Press SETPOINT to access the setpoint screen Enter the station s licensed power outputs to be u...

Page 30: ...t when starting out it is best to reassemble them in the same locations as tested Keep a record of any changes for future reference Make sure each module is completely seated CAUTION DO NOT USE EXCESSIVE FORCE OR SLAM MODULES INTO THE SLOTS 2 12 4 Control System Check Out a Apply power to all cabinets and peripherals b Turn on all cabinet breakers c Check the CABINET SELECT LED on each slave con t...

Page 31: ...analyzer and set the level 26 dB less than visual g Connect the aural exciter to J9 on the Main Controller h The VSWR should read approximately 1 11 1 If substan tially different from this reading perform procedure in paragraphs 5 11 1 through 5 11 3 1 as required to adjust the reflected power calibration i Set Aural foldback jumper J19 to connect pins 2 and 3 disabled j Slowly raise the aural exc...

Page 32: ...al information screen Re enable each module using a trans mitter ON command before proceeding to the next m Switch AGC back ON when done and RAISE power to 100 n Compare AGC reading on the display and voltages at the test points on front of the module to the factory test data o Refer to AGC adjustments in Section V if needed p Refer to exciter manual for adjustment of the following Depth of modula...

Page 33: ...XCITER FAULT Indicates an exciter fault or exciter switcher fault VSWR FAULT If VSWR foldbackisenabledtheVSWR FAULT logic in the Main Controller is disabled and the VSWR fault detection in the RF modules will protect them from damage If a VSWR condition causes VSWR foldback to activate the FOLDBACK ACTIVE fault indicator will light and the power output of the transmitter will be reduced If the VSW...

Page 34: ...he phase sequencing If all cabinet indications are dark the phase feeding the logic power supplies is probably lost AURAL DRIVE CHAIN FAULT optional Indicates an aural driver has failed in the parallel aural driver chain EXTERNAL INTERLOCK When open the External Interlock will prevent the transmitter from turning on The circuit must be closed through the external interlock device for normal opera ...

Page 35: ...e scription of the function of any of the soft keys may be obtained by pressing that soft key A message will then appear on the display to explain the function of that soft key To exit the help mode press the HELP key again and the display will return to its previous screen A total of 13 different display screens are contained in the display system Refer to Figures 3 2 and 3 3 Each is briefly de s...

Page 36: ...ther the alarm is currently active or inactive Alarms Full Description This screen is displayed by using the DESC key from the Systems Alarms screen This screen displays more fully detailed descriptions of each alarm SETUP key associated screens Refer to Figure 3 3 Pressing the SETUP key in the bar graph display screen passes control to the User Setup Se lection Menu Time Date Entry This screen is...

Page 37: ... the alarms queue If the ALARM is on solid it means that there are alarms in the queue that are inactive they occurred but the condition has gone away If there are no alarms in the queue the ALARM will be blank and no access will be allowed into the Alarms page The METER key will take the user to the multi meter informa tion in the system The first information displayed by invoking the METER key a...

Page 38: ...ng screens are shown for a 30kW transmit ter Other power levels may display more or less information de pending on configuration AURAL INFORMATION ALARM Power Forward Reflected Power VSWR Chain B Power AGC Voltage 100 1 1 1 6 0 kW 16 W 3000 W 5 77 V VISUAL SUPPLY LINE EXIT Chain A Power 3000 W Reject Load 10 W Option 20 Aural ONLY Figure 3 6 Aural Information Screen Aural Information This screen i...

Page 39: ...phase input power EXIT This key will return the user to the Bargraph Meter screen POWER SUPPLY INFORMATION ALARM PREV VISUAL AURAL LINE EXIT Main Logic Supply Voltages 5 12 12 UNREG MAIN BATT MON BATT 5 19 12 0 12 1 1 3 4 35 4 18 Figure 3 8 Power Supply Information Screen 2 Power Supply Screen 2 This screen is displayed when the NEXT key is selected on the Power Supply information first screen Thi...

Page 40: ...n the system SUPPLY This key will display the Power Supply information of the transmitter system EXIT This key will return the user to the Bargraph Meter screen Figure 3 10 User Setup Selection Menu User Setup Selection Menu screen This screen is called up when SETUP key is depressed while viewing the bargraph meter screen default This screen is used to select 1 of the 4 user available options The...

Page 41: ...ield by 1 This key decrements the value in the selected field by 1 SET TIME This key updates the Time and Date with the user edited value EXIT This key will return the user to the User Setup Menu Use 24 hour format to enter pm times i e 2 00pm 14 00 NOTE DATE does not advance to a new year on January 1 and does not automatically include Feb 29 during a leap year The year entry must be changed maua...

Page 42: ...3 13 User Display Edit D A OUTPUT EDIT 1 Visual Power 1 Visual Power 2 Visual VSWR 3 Aural Power 4 Aural VSWR Visual Reflected Power Aural Reflected Power Visual Drive A Power Aural Chain A Power DOWN UP SWAP NEXT EXIT Figure 3 14 D A Output Edit D A Output Edit This screen is displayed when the USER DISPLAY EDIT key is selected on the USER SETUP SELEC TION MENU screen This screen is used to selec...

Page 43: ...een allows the user to enter the Visual and Aural forward powers for the transmitter These values are used to calculate the digital display of power and do not increase or decrease the amount of power output New setpoints cannot be entered while the transmitter is on There are 5 active softkeys on this screen They are This key advances the cursor through the Visual and Aural setpoint fields This k...

Page 44: ...99 as they are picked up in memory Numbering will start over after 1000 events A monitor reset will cause counting to start again at 001 There are 5 active softkeys on this screen They are DOWN This key moves the cursor down through the alarms list and is indicated by the cursor arrow UP This key moves the cursor up through the alarms list and is indicated by the cursor arrow DELETE This key will ...

Page 45: ... switcher will automatically switch to the alternate exciter IfVSWR foldback is active the exciter switcher will be held in the manual mode until the foldback is no longer active EXCITER A SELECTED Indicates exciter A is selected EXCITER B SELECTED Indicates exciter B is selected MANUAL SELECTED Indicates the switcher is in the manual mode Table 3 1 Optional Exciter Switcher Section III Operation ...

Page 46: ...cted sample of pa output EXC Test point 7 detected sample of exciter drive GND Ground Table 3 2 AGC Module Controls and Indicators VERIFICATION OF AGC OPERA TION 1 Reduce transmitter power to 50 2 Set AGC MODE switch to OFF 3 Raise transmitter power back to 100 4 Set AGC MODE switch to ON 5 Verify AGC action reduces transmitter power 6 If AGC does not reduce transmitter power contact maintenance p...

Page 47: ...imum reject load power 3 Adjust A or B GAIN as necessary for minimum reject load power 4 Place RUN SET switch in RUN position and adjust PHASE for minimum reject load power Table 3 3 Phase and Gain Module Set Up Section III Operation Controls and Indicators Rev B 1 11 1999 888 2365 001 3 15 WARNING Disconnect primary power prior to servicing ...

Page 48: ...r an ac power outage During this time the power controls are active and will raise or lower the power if depressed even though ac is not present STATUS LED s SECOND CORRECTOR Indicates optional corrector for dual power level is in use AURAL MUTE Indicates aural exciter is muted either internally PLL failure or externally MAIN CONTROLLER on off or overload VISUAL MUTE Indicates VISUAL exciter is mu...

Page 49: ...e power supply controller for 50 volt supply PS 2 has sensed a fault within the supply 3 5 2 7 Cabinet Select In transmitters with multiple amplifier cabinets this LED should blink indicating the monitor board has accessed the slave control ler for data In transmitters with only a single amplifier cabinet the monitor board only monitors one slave controller it does so continuously and the LED shou...

Page 50: ... of two blinks per cycle will appear until the overdrive fault is removed 3 5 4 50 Volt Power Supplies Figure 3 26 provides a list of the controls and indicators for the 50 volt DC power supplies 3 6 Operation 3 6 1 Turn ON Sequence The normal transmitter turn on cycle begins by depressing the ON switch on the main controller or by providing a remote ON command This starts a chain of events ON com...

Page 51: ...unning at the correct drive level when excit ers are switched at a later time The exciter power controls are active even if AC power is re moved Thus avoid RAISE commands if the transmitter is not actually on If any doubt as to the exciter level setting exists depress and hold the LOWER command for about 15 seconds to assure a safe low drive condition upon turn on The RAISE LOWER controls are dual...

Page 52: ...3 20 888 2365 001 Rev B 1 11 1999 WARNING Disconnect primary power prior to servicing ...

Page 53: ...re 1 input 2 0o output 3 90o output and 4 reject This type of hybrid is symmetrical which means that the device operates by the same rules for waves incident on either pair of ports Other types of hybrids with different amplitude and phase relationships also exist and are useful for non symmetrical combining subtracting one signal from another etc The rules for the operation of 3 dB quadrature hyb...

Page 54: ... ence between the exciter sample and the transmitter sample This difference is integrated by R30 and C16 buffered and applied to base of Q1 a Darlington transistor whose emitter drives a PIN diode attenuator R1 through R9 form fixed pi attenuators used to bring the exciter drive level to within the desired range U1 a 3 dB 90o hybrid is connected to PIN diodes CR1 through CR4 and resistors R11 and ...

Page 55: ...witch debouncing is performed with RC low pass filters Op amps configured as comparators U15 are used sense when the low pass output voltage exceeds a transition level A single output transition is ensured by establishing a 33 comparator hysteresis window Current buffering for the LED and PIN diodes is performed using discrete Darlington transistors Q1 Q2 Q3 and DIP transistor arrays U11 through U...

Page 56: ... OFF controls It also contains the VSWR Foldback circuit VSWR Overload fault logic and RF peak detectors for sampling These circuits work together to protect the transmitter in the event of elevated antenna system VSWR in order to prevent danger to the trans mitter 4 2 8 2 1 Debounce sheet 1 Inputs with pulsed raising or falling edges can cause problems if the transitions are slow or if multiple t...

Page 57: ...nd the front panel FOLD BACK ACTIVE fault indicator to illuminate This signal is also passed to the VSWR overload logic to disable the forward power memory detector so that if foldback is active a VSWR fault will not be latched by O L latch U24 4 2 8 2 6 Fault Status Drivers sheet 3 The front panel indicators are driven by high current buffers which allow logic signals to control the indicator lam...

Page 58: ...stem See Slave Controller schematic The slave controller is connected to the monitoring system by a 26 wire twisted pair cable that allows bi directional communi cation between the two sections of the transmitter monitoring logic This 13 pair bus is called the MONITOR BUS and is daisy chained from cabinet to cabinet Each cabinet ON OFF control is handled by a three connector cable to the Main Cont...

Page 59: ...50 volts DC In order for U58 to enable the supplies the following conditions must be met a The TX ON OFF latch must be set to ON b The blower must be running and the AIR switch closed c The door must be closed The above conditions will enable U58 closing the poweron loop If a power supply faults off it can be re enabled by pressing the transmitter ON button This will cause the CAB ON lines to puls...

Page 60: ...er supply and control board schematics The Basler Electric 15 kW power supply operates from a three phase AC line 208 240 volts AC delivering 50 volts DC at a rated current of 300 amps The three phase AC input can be connected for the following voltages a 208 Delta 220 Delta 240 Delta b 360 208 WYE 381 220 WYE and 416 240 WYE The primary of T1 T2 and the cooling fan are paralleled from terminal bl...

Page 61: ...n reapplying the three phase AC input R84 is adjusted to give an overvoltage trip when the DC output voltage exceeds 57 VDC If the output voltage exceeds the threshold set by R84 U1 pin 13 will cause CR40 to fire which turns on DS1 the overvoltage LED CR40 also allows CR32 and CR55 to conduct and shuts down the 24 volt regulator As with the overcurrent trip shutting off the 24 volt regulator will ...

Page 62: ...4 10 888 2365 001 WARNING Disconnect primary power prior to servicing ...

Page 63: ...Section IV Theory of Operation 888 2365 001 4 11 WARNING Disconnect primary power prior to servicing ...

Page 64: ...4 12 888 2365 001 WARNING Disconnect primary power prior to servicing ...

Page 65: ...Section IV Theory of Operation 888 2365 001 4 13 WARNING Disconnect primary power prior to servicing ...

Page 66: ...4 14 888 2365 001 WARNING Disconnect primary power prior to servicing ...

Page 67: ... pressure drop measured above Use Harris part number 448 0921 000 American Air Filter 627130500 or equivalent filter for replacement 5 3 Air Switch Adjustment Turn transmitter OFF and open rear door of the cabinet requiring adjustment Remove the tubing connecting the air switch to the port on the divider panel Connect a length of tubing from the air switch tube to a tee connector at the manometer ...

Page 68: ...S ON DISPLAY PANEL ON AIR Weekly RECORD DC INPUT AND 50 VOLT SUPPLY CURRENTS IN BLACK IDLE 50 APL Monthly VISUAL PERFORMANCE CHECKS VIDEO LEVEL Weekly SYNC RATIO Weekly DIFF GAIN Weekly ICPM Weekly DIFF PHASE Weekly GROUP DELAY T PULSES Weekly POWER CALIBRATION 6 months AGC SET UP 6 months SWEEP RESPONSE 6 months AURAL PERFORMANCE CHECKS MODULATION LEVELS Weekly SCA LEVELS Weekly POWER CALIBRATION...

Page 69: ...robe such as Fluke style B or C Route its leads out through top of cabinet The gasket will compress around the leads when door is shut Measure the cabinet intake blower currents If an exhaust blower is used measure its currents as well Note the AC line voltage readings at this time as well and record the current and voltage data for future reference in Table 5 2 As the motor bearings wear the moto...

Page 70: ...at the calorimeter inlet Tin and outlet Tout If water is used to cool the load the following formula applies Paverage kW 0 264 x Tout Tin x G P M CAUTION The factor 0 264 in the above formula applies only if water is used as the coolant in the load If a glycol coolant mixture is used consult the glycol supplier to obtain the correct specific gravity factor based on their coolant formulation The fo...

Page 71: ...F fields laboratory grade mercury thermometers may be necessary in hostile RF environments 5 11 3 Visual Peak Sync to Average Power Conver sion Formulas The transmitter s visual power meters read peak of sync power but through line meters and calorimeters yield average power measurements If a test signal consisting of only blanking and sync black picture is used the following formulas apply For M ...

Page 72: ...upler rotation for minimum reflected indica tion noting the directivity A minimum of30 dB directivity is needed for measurements used to control interlocks but more directivity gives better accuracy i Repeat the depth and rotation adjustments until the desired coupling ratio and directivity values are reached j Re install the line section in the system and calibrate power of the stage 5 12 2 Peak ...

Page 73: ...kW transmitters energize one visual PA cabinet at a time Apply blanking and sync test signal to the exciter Be sure no SET UP is used Using external metering at the combined port adjust the transmitter output power to the values of combined averagepowerindicatedinthecorrecttablebelow Usethetablethat corresponds to your system M NTSC B PAL or B SECAM Check for correct sync ratio at the PA cabinet o...

Page 74: ...or 2 5 Volts at TP 4 Restore cables to normal configuration If the 20 aural power option is installed in the transmitter energize only one of the RF chains and set the combined output power to 1 5 kW Next adjust R 60 on the slave controller for 2 5 volts at TP 3 The aural RF chain display should read 1 5 kW De energize that aural RF chain and energize the other chain Repeat the procedure this time...

Page 75: ...e en ergize that aural RF chain and energize the other chain in that cabinet and repeat the procedure except adjusting R 74 at TP 4 Repeat the process for the other aural PA cabinet 5 15 Reject Load Calibration This section covers calibration of the reject load power peak detectors for those transmitters with external reject loads 5 15 1 20 kW Transmitters 5 15 1 1 Visual Reject Load Energize one ...

Page 76: ...eject load monitoring points are located in the Aural PA cabinets with reject load 1 being monitored in the Aural PA A cabinet and reject load 2 being monitored in the Aural PA B cabinet For calibrating reject load 1 power the high impedance voltmeter should be connected to TP 7 and R 77 should be adjusted for 2 5 volts with one of the RF chains energized For calibrating reject load 2 power the hi...

Page 77: ... S or later SCREEN BLANKER Blanks the screen when enabled after 1 hour of inactivity on the function keys Any key press after blanking redisplays last screen Section V Maintenace Rev B 1 11 1999 888 2365 001 5 11 WARNING Disconnect primary power prior to servicing ...

Page 78: ...r reduction adjustment NOTE If adjusting the visual AGC changed the drive level check adjust ment of the exciter precorrection for differential gain ICPM and differential phase Refer to the exciter manual 5 17 Monitor Configuration Switches Two eight bit configuration switches on the monitor board are used to configure the monitor system for use in a given transmit ter model See Table 5 7 on page ...

Page 79: ... panel transmitter meter d Set the level of the reflected signal visual power such that the front panel display indicates a aural VSWR of 1 40 1 e If the front panel FOLDBACK ACTIVE fault indicator is on adjust the aural foldback threshold adjust R33 on the main controller until the foldback indicator turns off f Now adjust R33 until the FOLDBACK ACTIVE fault indicator just comes on g Set Aural fo...

Page 80: ...5 14 888 2365 001 Rev B 1 11 1999 WARNING Disconnect primary power prior to servicing ...

Page 81: ...ce with the ohmmeter test leads configured in both directions CR1 should measure a low resistance with test leads configured in one direction and a very high resistance with test leads configured in the other direction 6 3 Cabinet Complete Power Down It may be desirable in some cases to perform maintenance on one visual PA while operating at reduced power using the remaining cabinet When no power ...

Page 82: ... O SET Aural Reflected Power Overload Set Point Voltage CONTR BATTERY Discrete Controller Battery Voltage 9 VIS FB SET Visual Foldback Set Point Voltage 10 AUR FB SET Aural Foldback Set Point Voltage 11 ZERO SCALE A D Zero Scale Calibration Potenti ometer Voltage GROUND REF Analog Ground Refer ence b Column 2 Analog Information 1 AC LINE 1 AC Line Monitor 1 Output Voltage 2 AC LINE 2 AC Line Monit...

Page 83: ... Fault PS2F 1 Power Supply 2 Fault SPAR1 Spare SPAR2 Spare SPAR3 Spare TXD 1 Cabinet is OFF MODF This is a Hexadecimal number with each bit of each hex digit corresponding to a module slot in the cabinet The low order bit of the low order digit refers to slot one the next high order bit refers to slot two and so on up to slot 17 A bit equal to one means that the module in the refer enced slot has ...

Page 84: ...e second lowest slot number in that digits group of four slots 4 fault in the third lowest slot number in that digits group of four slots 8 fault in the highest slot number in that digits group of four slots The hexadecimal number in each digit represents the sum of the four fault bits for that group i e if slots 2 and 4 have faults the lowest digit will show an A which represents the sum of 8 and...

Page 85: ...C LINE FILTER 939 7900 728 7 18 Table 7 21 BASIC SLAVE CONT PCB 992 8003 004 7 18 Table 7 22 PWA LED BOARD 992 8023 001 7 20 Table 7 23 MOV AC PROTECTOR ASSY 992 8553 001 7 21 Table 7 24 PA REAR DOOR ASSY 992 9965 001 7 21 Table 7 25 VISUAL PA CABINET 992 7080 001 7 21 Table 7 26 PHASE AND GAIN MODULE LB 992 8011 001 7 23 Table 7 27 PWB PHASE GAIN BD LB 992 8020 001 7 23 Table 7 28 PHASE GAIN MODU...

Page 86: ...RT NO EQUALS ONE PAIR 384 0431 000 RECT 1N4001 ESD 1 0 EA CR101 404 0578 000 SOCKET RELAY 4PDT 1 0 EA XUK2 424 0502 000 BUMPER 5 8 DIA X 1 4 THK 2 0 EA 430 0031 000 FAN CARAVEL CL3T2 020191 1 0 EA 1B001 430 0202 000 SCREEN GUARD WIRE FORM 1 0 EA 1B001 448 0729 000 STRIKE MAGNETIC CATCH 1 0 EA 448 0906 000 HINGE DOOR POSITIONING 2 0 EA REAR DOOR 448 0937 000 HINGE DOOR POSITIONING 2 0 EA DOOR 448 1...

Page 87: ... WITH ACCESSORY PANEL 943 4999 156 PLATE MTG SPARE EXTRUSION 3 0 EA 943 4999 164 COVER CABINET BASE 1 0 EA 943 4999 172 COVER CIRCUIT BREAKER 1 0 EA 943 4999 173 COVER CABINET BASE 1 0 EA 943 4999 174 COVER DISPLAY BOARD 1 0 EA 943 4999 258 BRKT SLIDE RIGHT 2 0 EA USED WITH EXCITER BOX 943 4999 267 BOX FAN MTG 1 0 EA 952 9200 004 CABINET ASSY CONT 1 0 EA 952 9200 012 PANEL BD MTG CONTROLLER 1 0 EA...

Page 88: ...SE 28 540 0581 000 RES 56 0 OHM 2W 5 14 R001 R002 R003 R004 R005 R006 R007 R008 R009 R010 R011 R012 R013 R014 610 1079 000 HEADER 20 PIN STRAIGHT 1 839 7900 052 SCHEMATIC FAULT LAMPS 0 843 4999 119 PWB FAULT LAMPS 1 Table 7 4 BASIC DISCRETE CONT PCB 992 8032 001 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 354 0685 000 TERMINAL MALE 9 J001 358 3223 000 FEMALE SCREWLOCK 56 4 40 7 380 0126...

Page 89: ...XU017 XU018 XU019 XU020 XU021 XU023 XU026 XU057 404 0674 000 SOCKET 14 PIN DIP D L 28 XU005 XU006 XU008 XU009 XU010 XU012 XU013 XU024 XU027 XU028 XU029 XU034 XU035 XU036 XU037 XU038 XU039 XU040 XU041 XU042 XU043 XU046 XU048 XU049 XU050 XU051 XU053 XU054 404 0675 000 SOCKET IC 16 CONT 19 U056 XU001 XU002 XU004 XU011 XU022 XU025 XU030 XU031 XU032 XU044 XU045 XU047 XU055 XCR011 XCR033 XCR041 XCR055 X...

Page 90: ...R022 R025 R026 R030 R032 R036 R039 R040 R042 R046 R047 R049 R050 R053 R054 R055 R059 R060 R062 R065 R066 R068 R070 R111 R124 R126 R141 R142 R143 R147 R148 R150 R151 R152 R163 540 0949 000 RES 36 0K OHM 1 4W 5 2 R008 R011 540 0952 000 RES 47 0K OHM 1 4W 5 1 R014 540 0960 000 RES 100 0K OHM 1 4W 5 13 R001 R002 R003 R019 R031 R104 R105 R106 R107 R114 R160 R161 R162 540 0970 000 RES 270K OHM 1 4W 5 6 ...

Page 91: ... 072 SCHEM DISCRETE CONT 0 843 4999 118 PWB DISCRETE CONT 1 Table 7 5 PROGRAMMED MONITOR BD 992 8040 002 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 746 0140 000 LICENSE PSOS KERNAL 0 BASE OPERATING SYSTEM LICENSE FEE PAID BASED ON NUMBER OF CONTROL CABINETS 917 2100 222 PAL I O DECODE 1 1 U010 917 2100 224 PAL I O CABINET 1 U011 917 2100 225 PAL I O DECODE 2 1 U012 917 2100 282 PAL I O...

Page 92: ...382 1176 000 IC 74HCT138 ESD 1 U080 382 1177 000 IC 74HCT259 ESD 4 U075 U076 U077 U078 382 1178 000 IC 74HCT373 ESD 2 U056 U057 382 1179 000 IC 74HCT574 ESD 3 U049 U054 U055 382 1180 000 IC 14C89A ESD 2 U037 U038 382 1181 000 IC 14C88 ESD 2 U033 U034 382 1182 000 IC MM58167 ESD 1 U044 382 1183 000 IC 68681 DUAL UART ESD 1 U030 382 1184 000 IC ADG506A ANALOG ESD 2 U046 U047 384 0205 000 DIODE SILIC...

Page 93: ... 540 0065 000 RES 4 7K OHM 1 2W 5 2 R079 R080 540 0912 000 RES 1 0K OHM 1 4W 5 3 R096 R097 R098 540 0918 000 RES 1 8K OHM 1 4W 5 4 R007 R062 R063 R064 540 0928 000 RES 4 7K OHM 1 4W 5 1 R037 540 0936 000 RES 10 0K OHM 1 4W 5 10 R002 R006 R046 R047 R075 R076 R078 R099 R100 R105 540 0960 000 RES 100 0K OHM 1 4W 5 1 R081 540 0984 000 RES 1 0M OHM 1 4W 5 3 R005 R082 R083 540 1008 000 RES 10 0M OHM 1 4...

Page 94: ...3 J054 J055 J056 J057 J058 J059 612 1184 000 JUMPER 1 CENTERS 30 P001 P002 P003 P004 P005 P006 P007 P008 P009 P010 P011 P012 P013 P014 P015 P016 P017 P018 P019 P020 P021 P022 P023 P024 P025 P026 P027 P028 P029 P030 612 1296 000 CON 9 PIN D RECEPTACLE 1 J005 612 1297 000 CON 25 PIN D RECEPTACLE 1 J009 660 0036 000 BATTERY NI CD 3 6V NOM 1 B001 REMOVE FOR SHIPMENT STORAGE 700 1233 000 OSCILLATOR 10 ...

Page 95: ...3 540 0290 000 RES 18 OHM 1W 10 1 0 EA R001 540 0319 000 RES 300 OHM 1W 10 2 0 EA R002 R003 540 0584 000 RES 75 OHM 2W 10 2 0 EA R012 R013 548 2400 169 RES 51 1 OHM 1 2W 1 3 0 EA R015 R019 R037 548 2400 173 RES 56 2 OHM 1 2W 1 2 0 EA R011 R014 548 2400 273 RES 562 OHM 1 2W 1 1 0 EA R036 548 2400 301 RES 1K OHM 1 2W 1 5 0 EA R018 R022 R029 R034 R053 548 2400 309 RES 1 21K OHM 1 2W 1 1 0 EA R040 548...

Page 96: ...674 000 SOCKET DIP 14 PIN DL 2 0 EA XU002 XU004 404 0675 000 SOCKET DIP 16 PIN DL 1 0 EA U003 410 0405 000 INSULATOR XSTR TO220 1 0 EA Q001 494 0398 000 CHOKE RF 10 0UH 10 2 0 EA L001 L002 516 0530 000 CAP 01UF 10 100V X7R 12 0 EA C001 C002 C003 C004 C005 C007 C010 C011 C012 C014 C017 C019 516 0736 000 CAP 001UF 10 100V X7R 1 0 EA C018 516 0953 000 CAP 1 000UF 10 50V 1 0 EA C009 522 0550 000 CAP 1...

Page 97: ...SD 3 0 EA U005 U006 U007 382 0521 000 IC 339 ESD 1 0 EA U001 382 0587 000 IC CD4011 MC14011 ESD 2 0 EA U003 U004 382 0972 000 IC 4071B ESD 1 0 EA U002 384 0205 000 DIODE SILICON 1N914 4148 ESD 8 0 EA CR006 CR007 CR008 CR009 CR011 CR019 CR020 CR028 384 0431 000 RECT 1N4001 ESD 4 0 EA CR012 CR013 CR014 CR018 384 0661 000 LED GRN T 1 3 4 RT ANG ESD 7 0 EA CR002 CR003 CR004 CR005 CR010 CR015 CR021 384...

Page 98: ...able 7 15 MOV AC PROTECTOR ASSY 992 8553 002 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 560 0042 000 MOV 6500A 190J 510VAC 6 CR007 CR008 CR009 CR010 CR011 CR012 560 0049 000 MOV 4500A 75J 275VAC 6 CR001 CR002 CR003 CR004 CR005 CR006 610 1066 000 CONN 25 FASTON PC MOUNT 3 A B C 839 7900 606 PWB MOV AC PROTECTOR 1 839 7900 614 SCHEM MOV AC PROTECTOR 0 999 2711 001 WIRE TUBING LIST 0 QTY ...

Page 99: ...LOCK 606 0824 000 CKT BKR 7 5A 3P 480VAC 1 0 EA CB002 606 0963 000 CIRCUIT BREAKER 1A 277V 480 2P 1 0 EA CB101 614 0811 000 BARRIER BLOCK 3POLE 1X4 1 0 EA TB001 614 0812 000 BARRIER BLOCK 1 POLE 1X4 1 0 EA TB2 GND CONNECTION BY CONTACTOR 620 2537 000 PLUG HOUSING 12 POS 9 0 EA 2A17J2 2A15J2 2A13J2 2A11J2 2A9J2 2A7J2 2A5J2 2A3J2 2A1J2 813 5001 066 STDOFF 10 32X3 4 3 8 HEX 4 0 EA 4W HEATPIPE 813 500...

Page 100: ...S 943 4999 062 PLENUM ASSY TOP 1 0 EA 943 4999 063 KICKPLATE ASSY FRONT 1 0 EA 943 4999 085 BLANK MODULE EXTRUSION 2 0 EA P S COVER 943 4999 090 CAPACITOR RACK BASE 1 0 EA REAR FAN ASSY 943 4999 114 SCR BLEEDER ASSY VIS 1 0 EA A028 943 4999 125 LINER ASSY LEFT 1 0 EA 943 4999 126 LINER ASSY RIGHT VISUAL 1 0 EA 943 4999 147 PANEL EXT MTG PWR SUPPLY 2 0 EA P S COVER 943 4999 151 SAFETY COVER CONTACT...

Page 101: ...WIRE RETAINER RELAY SOCK 1 XK001 410 0377 000 INSULATOR WASHER 2 516 0411 000 CAP 1UF 50V DISC 1 C001 540 0017 000 RES 47 0 OHM 1 2W 5 2 R008 R009 540 0035 000 RES 270 0 OHM 1 2W 5 1 R007 540 0041 000 RES 470 OHM 1 2W 5 2 R004 R005 540 0049 000 RES 1K OHM 1 2W 5 1 R006 542 0282 000 RES 1 OHM 5 100W 3 R001 R002 R003 574 0362 000 RELAY 2PDT 12VDC 1 K001 614 0048 000 TERM BD 4 TERM 1 TB001 839 7900 0...

Page 102: ... BOARD 1 Table 7 20 ASSY AC LINE FILTER 939 7900 728 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 252 0004 000 WIRE STRD 18AWG WHT YEL 2 FT 296 0264 000 TUBING SHRINK 1 2 WHITE 2 FT 354 0001 000 LUG 6 RING RED 22 18 AWG 1 354 0624 000 TERMINAL MALE 3 354 0625 000 TERMINAL FEMALE 3 354 0749 000 TERM FOR 250 X 032 TAB 5 484 0297 000 FILTER RFI POWER LINE 1 610 0738 000 PLUG HOUSING 1 612 0...

Page 103: ...04 0675 000 SOCKET IC 16 CONT 26 XU001 XU002 XU003 XU004 XU005 XU008 XU021 XU022 XU023 XU024 XU028 XU029 XU030 XU031 XU036 XU037 XU048 XU056 XU061 XCR008 XCR009 XCR010 XCR011 XCR012 XCR013 U055 404 0704 000 SOCKET IC 20 PIN 10 XU006 XU007 XU009 XU026 XU027 XU032 XU035 XU050 XU052 XU054 404 0797 000 SOCKET IC 24 PIN 300 MTG 5 XU044 XU045 XU049 XU051 XU053 478 0392 000 XFMR RF MODEL T4 1 6 T001 T002...

Page 104: ... 0851 000 SW RKR 8PST DIP 1 S001 604 0866 000 SW PB SNAP ACTION SPDT 2 S002 S003 610 0738 000 PLUG HOUSING 1 J002 610 0833 000 HOUSING PLUG 12 POS 1 J003 610 0836 000 HOUSING PLUG 6 POS 1 J004 610 0900 000 HEADER 3 CKT STRAIGHT 2 J015 J016 610 0933 000 JUMPER PWB TEST POINT 16 GND001 GND002 GND003 GND004 TP001 TP002 TP003 TP004 TP005 GND005 TP006 TP007 TP008 TP009 TP010 TP011 610 0939 000 HOUSING ...

Page 105: ...FAN ASSY 917 2382 001 ANGLE MTG FAN GUARD 4 0 EA ANGLE FAN GUARD 922 0900 402 BLOCK HINGE REAR DOOR 3 0 EA REAR FAN ASSY DOOR HINGE 922 0900 407 PIN ALIGNMENT 1 0 EA 943 4999 073 MODIFICATION VENTURI 1 0 EA 943 4999 428 CLAMP FILTER CENTER 1 0 EA REAR FAN ASSY 943 4999 429 CLAMP FILTER END 2 0 EA REAR FAN ASSY 943 4999 432 WRAP ASSY FILTER 1 0 EA REAR FAN ASSY 943 4999 433 PANEL FAN MOUNTING 1 0 E...

Page 106: ...ATOR SUPPORT 6 0 EA BUSS BARS 822 0900 136 GND STRAP 1 0 EA TOP GND 822 0900 248 BRK T HONEY COMB 64 0 EA MODULE HONEY COMB 822 0900 249 HONEY COMB VERTICAL 32 0 EA MODULE HONEY COMB 822 0900 360 BRKT DIODE MTG 2 0 EA 827 6893 001 PLATE 1 0 EA TOP GND 839 7900 056 STRAP POSITIVE 2 0 EA CAPS 839 7900 057 STRAP NEGATIVE 2 0 EA 839 7900 073 BRKT INTERLOCK 1 0 EA 839 7900 093 GROUND STRAP 1 0 EA MODUL...

Page 107: ...TROLLER MODULE 1 0 EA A018 992 8553 001 PWA MOV AC 198 250 VAC 1 0 EA BOARD WITH MOV S 992 9965 001 PA REAR DOOR ASSY 1 0 EA 999 2612 001 HARDWARE LIST P A VIS 1 0 EA 999 2613 001 WIRE TUBING LIST FOR 1 0 EA Table 7 26 PHASE AND GAIN MODULE LB 992 8011 001 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 952 9200 007 PHASE GAIN TRAY ASSY 1 992 8020 001 PWB PHASE GAIN BD LB 1 999 2578 001 HAR...

Page 108: ...2 C053 C058 C059 516 0736 000 CAP 001UF 10 100V X7R 1 C060 522 0550 000 CAP 100U 25V ELECTROLYTIC 2 C041 C044 540 0037 000 RES 330 0 OHM 1 2W 5 24 R021 R022 R023 R024 R025 R026 R027 R028 R029 R030 R031 R032 R033 R034 R035 R036 R037 R038 R039 R040 R041 R042 R043 R044 540 0584 000 RES 75 0 OHM 2W 5 4 R004 R005 R009 R010 540 0881 000 RES 51 0 OHM 1 4W 5 1 R001 540 0882 000 RES 56 0 OHM 1 4W 5 4 R002 ...

Page 109: ...ZORB 1N6376 12V 5W 2 CR043 CR044 404 0673 000 SOCKET 8 PIN DIP DL 1 XU015 404 0674 000 SOCKET 14 PIN DIP D L 7 XU006 XU009 XU010 XU011 XU012 XU013 XU014 404 0675 000 SOCKET IC 16 CONT 2 XU007 XU008 494 0196 000 CHOKE RF 100UH 24 L007 L008 L009 L010 L011 L012 L013 L014 L015 L016 L017 L018 L019 L020 L021 L022 L023 L024 L025 L026 L027 L028 L029 L030 494 0214 000 CHOKE RF 1 8UH 1 L005 494 0398 000 CHO...

Page 110: ...A1 992 8025 001 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 252 0003 000 WIRE STRD 20AWG WHT 2 8 FT 253 0059 000 CABLE 2C 22AWG AUDIO 3 FT 296 0262 000 TUBING SHRINKABLE 25 8 FT 620 2546 000 RF TRANSFER SWITCH 2 S001 S002 700 0116 000 RES LOAD 50 OHM 2W 2 RL001 RL002 839 7900 080 SCHEM EXIT SW RELAY PNL 0 839 7900 228 SCHEMATIC EX SW OPTION 0 917 2100 081 CABLE RF JUMPER 4 939 1250 003 ...

Page 111: ...P002 612 1131 000 RECEPTACLE 25 POS D 1 J002 612 1163 000 RECEPTACLE 37 POS D 1 J001 614 0790 000 TERM MODULE 1C PC MTG 236 14 14 TB001 839 7900 080 SCHEM EXIT SW RELAY PNL 0 843 4999 129 PWB EXCIT SW RELAY PNL 1 Table 7 34 DC POWER SUPPLY BASLER 50 V 300 A 736 0215 000 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 384 0841 000 DUAL THYRISTOR 3 Q1 Q2 Q3 Q4 Q5 Q6 550A RMS 250A IF AVG 400 P...

Page 112: ...0 IC PSC 2 1 2 HY001 HY002 382 1126 000 IC 78L12A ESD 1 U005 384 0355 000 DIODE HP5082 3081 A5S139 3 CR002 CR003 CR004 384 0838 000 TRANSZORB 1N6380 36V 5W 1 CR009 386 0123 000 ZENER 1N4732A 4 7V 1 CR001 494 0261 000 CHOKE RF 3 3UH 2 L001 L002 494 0262 000 CHOKE RF 10UH 10 1 L003 516 0453 000 CAP 1UF 100V 20 X7R 5 C007 C008 C012 C014 C015 516 0530 000 CAP 01UF 10 100V X7R 6 C001 C002 C003 C004 C00...

Page 113: ... HB 2 WAY 992 8557 007 8 16 Table 8 21 COMBINER HB 2 X 2 WAY 992 8558 007 8 16 Table 8 22 COMB HB 2 WAY 992 8559 007 8 17 Table 8 23 DIVIDER HB 2 X 2 WAY 992 8560 007 8 17 Table 8 24 DC PWA HB COUPLER 992 8844 001 8 17 Table 8 25 TAPE SWITCH ASSY 917 2100 146 8 17 Table 8 26 PWA LED BOARD 992 8023 001 8 17 Table 8 27 PWA LOGIC CONTROL BD 992 8127 002 8 17 Table 8 28 ATTENUATOR UNBALANCED PIE 917 2...

Page 114: ... 2 COMBINER 5 2 X 2 DIVIDER 5 2 WAY COMBINER 5 2 WAY DIVIDER 8 COVER 310 0017 000 WASHER FLAT 6 7 2 LOGIC CHASSIS 5 COUPLER 312 0006 000 WASHER INT LOCK 8 5 508 0560 000 314 0003 000 WASHER SPLIT LOCK 4 21 314 0005 000 WASHER SPLIT LOCK 6 44 314 0037 000 WASHER SPLIT LOCK 4 SS 9 9 LOAD RESISTORS 336 1239 000 SCREW 6 32 X 3 8 12 5 2 X 2 DIVIDER 5 2 X 2 COMBINER 2 COUPLER 344 0009 000 SCREW SET 8 32...

Page 115: ... PWA LOGIC CONTROL BD 1 A002 992 8557 102 DIVIDER 2 WAY LB1 1 A003 992 8558 102 COMB LB1 2 X 2 WAY 1 A006 992 8559 102 COMB LB1 2 WAY 1 A005 992 8560 102 DIVIDER LB1 2 X 2 WAY 1 A004 992 8976 001 COUPLER ASSY LB MODULE 1 A001 NEED NEW NO L W 992 9018 001 RF PLUG ASSY 1 J001 Table 8 2 MODULE DRIVER BASIC LB1 992 8961 001 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 007 4060 079 BRZ FGR ST...

Page 116: ...000 XSTR MOSFET IXTH67N10 ESD 2 Q001 Q002 384 0831 000 LED LIGHT BAR MOUNT 2 386 0438 000 ZENER 1N5243 13V 0 5W 1 BUSS BAR CR001 410 0335 000 INSULATOR SCREW 1 A2U011 410 0413 000 INSULATOR PAD FOR TO 247 3 A2U011 2 PASS FETS 410 0414 000 THERMAL PAD 1 000 X 800 2 414 0292 000 CORE BALUN 2500 PERM 4 L014 L015 L016 L017 424 0013 000 GROMMET 381 MTG DIA 1 424 0598 000 BUSHING SPLIT GUIDE PIN 1 508 0...

Page 117: ...ALANT GLYPTOL 0 QT 086 0004 055 SOLDER SN62 PB36 AG2 0 CHIP CAPS 302 0052 000 SCR 4 40 X 1 4 8 MTG PWB 302 0053 000 SCR 4 40 X 5 16 2 ANGLE MOUNTING 302 0132 000 SCR 8 32 X 5 8 2 Q001 Q002 Q003 Q004 302 0401 000 SCR 4 40 X 1 4 3 R005 R015 RT001 310 0006 000 WASHER FLAT 8 2 Q001 Q002 Q003 Q004 310 0016 000 WASHER FLAT 4 1 RT001 310 0048 000 WASHER FLAT 4 UNDERSIZE 8 MTG PWB 314 0003 000 WASHER SPLI...

Page 118: ...0880 000 RES 47 0 OHM 1 4W 5 1 R017 540 0888 000 RES 100 OHM 1 4W 5 1 R030 540 1405 000 RES NETWORK 2700 OHM 2 1 R036 544 1652 000 RES 100 OHM 2W 5 4 R001 R004 R006 R009 544 1667 000 RES 5 1 OHM 2W 5 4 R002 R003 R007 R008 548 1102 000 RES 1 5K OHM 1 4W 1 1 R031 548 1120 000 RES 2K OHM 1 4W 1 1 R029 548 1508 000 RES 715 OHM 1 4W 1 1 R032 548 2069 000 RES 49 9K OHM 1 4W 1 2 R034 R035 548 2158 000 RE...

Page 119: ...99 495 PWB LB COMB DIV 2X2 1 Table 8 9 DC PWA LB COUPLER 992 8843 001 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 384 0321 000 DIODE 5082 2800 1N5711 2 CR001 CR002 516 0831 000 CAP 0 010UF 10 100V 2 C001 C002 540 0321 000 RES 360 0 OHM 1W 5 1 R005 544 1651 000 RES 51 OHM 2W 5 1 R001 548 2103 000 RES 100 OHM 2W 1 1 R002 548 2192 000 RES 49 9 OHM 2W 1 2 R003 R004 843 4999 479 PWB LB COUPL...

Page 120: ...86 000 TERM LOCKING 10 RING 1 FRONT PANEL GND 356 0235 000 CABLE TIE 0 75 DIA 20 356 0237 000 CLAMP CABLE 1 4 DIA 1 TAPE SWITCH 356 0241 000 CABLE CLAMP TIE 6 358 1214 000 SCREWLOCK FEMALE 1 FILTERED D 380 0715 000 XSTR MOSFET IXTH67N10 ESD 2 Q001 Q002 384 0831 000 LED LIGHT BAR MOUNT 2 386 0438 000 ZENER 1N5243 13V 0 5W 1 BUSS BAR CR001 410 0335 000 INSULATOR SCREW 1 A2U011 410 0413 000 INSULATOR...

Page 121: ...0004 056 SOLDER SN96 AG4 0 OUTPUT CABLES 252 0420 000 WIRE RIBBON 5 X 100 MIL 4 FT FT TO FROM 1 4 MODS 252 0423 000 TEFLON INSULATED HOOK UP 2 FT 254 0005 000 WIRE BUS CU 14AWG 033 FT 302 0052 000 SCR 4 40 X 1 4 11 6 LOGIC 2 LOGIC REG 3 LOGIC CHASSIS 302 0053 000 SCR 4 40 X 5 16 3 3 LOAD RES 302 0054 000 SCR 4 40 X 3 8 3 3 CABLE CLAMPS 302 0058 000 SCR 4 40 X 3 4 4 2 PASS FETS 2 BUSS BARS 302 0106...

Page 122: ...002 516 0417 000 CAP 1000PF 10 200V 2 2 BUSS BAR C023 C028 516 0831 000 CAP 0 010UF 10 100V 4 4 BUSS BAR C024 C025 C026 C027 519 0011 000 CAP RF CHIP 2 4PF 500V 1 A5A1C003 540 0858 000 RES 5 6 OHM 1 4W 5 2 PASS FET R001 R002 544 1654 000 RES 100 OHM 250W 5 1 A5R001 544 1660 000 RES 100 OHM 20W 5 1 A3R001 556 0126 200 ATTEN 2 00 DB 30W INPUT 1 AT001 610 1222 000 PLUG RECP D 25 PIN 1 646 0665 000 IN...

Page 123: ...43 4999 493 PWB DIVIDER 2 WAY 1 Table 8 13 COMB LB2 2X2 WAY SSTV 992 8558 104 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 000 0000 010 B M NOTE 0 THIS ITEM USED AT HIGHERLEVEL RES 100 OHM 250W R1 R2 544 1654 000 500 1335 000 CAP 15PF 5 250V 2 C001 C004 519 0037 000 CAP RF CHIP 30PF 5 500V 2 C002 C003 843 4999 488 PWB COMB DIV 2 X 2 1 Table 8 14 COMB LB2 2 WAY SSTV 992 8559 104 HARRIS P ...

Page 124: ... PWB 310 0017 000 WASHER FLAT 6 7 2 LOGIC CHASSIS 5 COUPLER 314 0003 000 WASHER SPLIT LOCK 4 21 314 0005 000 WASHER SPLIT LOCK 6 44 314 0037 000 WASHER SPLIT LOCK 4 SS 9 9 DUMP LOADS 336 1239 000 SCREW 6 32 X 3 8 12 5 2 X 2 DIVIDER 5 2 X 2 COMBINER 2 COUPLER 344 0009 000 SCREW SET 8 32 X 3 16 2 EXT FLAPPER 350 0105 000 RIVET 3 16 ALUM 126 25 4 4 FRONT PANEL 350 0155 000 RIVET POP 156 X 392 10 5 DI...

Page 125: ... 007 DIVIDER HB 2 X 2 WAY 1 A004 992 8975 001 COUPLER ASSY HB MODULE 1 A001 992 9018 001 RF PLUG ASSY 1 J001 Table 8 17 MODULE DRIVER BASIC HB 992 8963 001 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 007 4060 079 BRZ FGR STK 97 606 02 32 0 313 OF 16 5 2 PIECES 2 5 REQ FOR LOGIC COVER 054 0014 103 CARTON SHIPPING 1 054 0014 107 INSERT FOAM PACKAGING 1 ST 086 0004 056 SOLDER SN96 AG4 0 OU...

Page 126: ...NT 2 386 0438 000 ZENER 1N5243 13V 0 5W 1 BUSS BAR CR001 410 0335 000 INSULATOR SCREW 1 A2U011 410 0413 000 INSULATOR PAD FOR TO 247 3 A2U011 2 PASS FETS 410 0414 000 THERMAL PAD 1 000 X 800 2 414 0292 000 CORE BALUN 2500 PERM 4 L014 L015 L016 L017 424 0013 000 GROMMET 381 MTG DIA 1 424 0598 000 BUSHING SPLIT GUIDE PIN 1 508 0560 000 CAP FEEDTHRU 1000PF 5 C001 C002 C003 C004 C005 508 0561 000 EMI ...

Page 127: ...52 000 SCR 4 40 X 1 4 8 MTG PWB 302 0053 000 SCR 4 40 X 5 16 2 ANGLE MOUNTING 302 0132 000 SCR 8 32 X 5 8 2 Q001 Q002 Q003 Q004 302 0401 000 SCR 4 40 X 1 4 3 R001 R011 RT001 310 0006 000 WASHER FLAT 8 2 Q001 Q002 Q003 Q005 310 0016 000 WASHER FLAT 4 1 RT001 310 0048 000 WASHER FLAT 4 UNDERSIZE 8 MTG PWB 314 0003 000 WASHER SPLIT LOCK 4 10 MTG PWB 314 0006 000 WASHER SPLIT LOCK 8 2 Q001 Q002 Q003 Q...

Page 128: ...1 1 R017 548 1508 000 RES 715 OHM 1 4W 1 1 R015 548 2069 000 RES 49 9K OHM 1 4W 1 2 R022 R023 548 2158 000 RES 1 65K OHM 1 4W 1 1 R016 550 0913 000 POT 5K OHM 4 R018 R019 R020 R021 550 0957 000 POT 500 OHM 1 2 W 10 1 R002 610 1223 000 HEADER 3 POSITION 1 J001 839 7900 702 SCH HB 1 4 MODULE 0 843 4999 641 PWB TEFLON RF 1 4 MOD HB 1 917 2100 536 WIRE ASSY 14 TURN TOROID 1 L009 Table 8 20 DIVIDER HB ...

Page 129: ...MBOLS EXPLANATIONS 296 0262 000 TUBING SHRINK 1 4 WHITE 06 FT 354 0711 000 CONTACT 24 20 RECEPTACLE 2 604 1102 000 SWITCH PRESS SENSING 8OZ 1 612 1312 000 HOUSING CONTACT 2 PIN 1 817 2100 146 ASSY INSTR TAPE SWITCH 0 Table 8 26 PWA LED BOARD 992 8023 001 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 384 0826 000 LED LIGHT BAR RED 1 CR001 384 0827 000 LED LIGHT BAR GREEN 1 CR002 610 0852 0...

Page 130: ...HM 1 4W 5 1 R060 540 0944 000 RES 22 0K OHM 1 4W 5 1 R001 540 0956 000 RES 68 0K OHM 1 4W 5 1 R040 540 0972 000 RES 330 0K OHM 1 4W 5 1 R055 540 0976 000 RES 470 0K OHM 1 4W 5 2 R035 R057 540 1386 000 RES NETWORK 10K OHM 2 1 R004 540 1416 000 RES NETWORK 10K OHM 2 1 R006 540 1493 000 RES NETWORK 100K 9 SIP 1 R015 544 1649 000 RES 33 OHM 2W 5 1 R080 548 0295 000 RES 47 5K OHM 1 4W 1 2 R020 R054 548...

Page 131: ... OHM 1 2W 1 0 548 0814 000 RES 93 1 OHM 1 2W 1 0 548 0828 000 RES 162 OHM 1 2W 1 0 548 0839 000 RES 221 OHM 1 2W 1 0 548 0856 000 RES 432 OHM 1 2W 1 0 548 1047 000 RES 140 OHM 1 2W 1 0 548 1390 000 RES 1 74K OHM 1 2W 1 0 548 1991 000 RES 294 OHM 1 2W 1 0 548 2053 000 RES 178 OHM 1 2W 1 0 548 2054 000 RES 232 OHM 1 2W 1 0 548 2074 000 RES 154 OHM 1 2W 1 0 548 2193 000 RES 11 5 OHM 1 2W 1 0 548 2194...

Page 132: ...T 0 556 0126 125 ATTEN 1 25 DB 30W INPUT 0 556 0126 150 ATTEN 1 50 DB 30W INPUT 0 556 0126 175 ATTEN 1 75 DB 30W INPUT 0 556 0126 200 ATTEN 2 00 DB 30W INPUT 0 556 0126 225 ATTEN 2 25 DB 30W INPUT 0 556 0126 250 ATTEN 2 50 DB 30W INPUT 0 556 0126 275 ATTEN 2 75 DB 30W INPUT 0 556 0126 300 ATTEN 3 00 DB 30W INPUT 0 556 0126 325 ATTEN 3 25 DB 30W INPUT 0 556 0126 350 ATTEN 3 50 DB 30W INPUT 0 556 01...

Page 133: ...8 001 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 051 0001 025 ADHESIVE LOCTITE 392 0 051 0001 026 ACTIVATOR LOCTITE 792 0 354 0075 000 TERMINAL LUG RING 8 1 516 0831 000 CAP 0 010UF 10 100V 1 C001 559 0053 000 THERMISTOR NTC 10K 25C 1 1 R001 Section VIII PA Module Parts List 10 15 96 888 2365 2377 2378 2400 2402 2450 xxx 8 21 WARNING Disconnect primary power prior to servicing ...

Page 134: ...8 22 888 2365 2377 2378 2400 2402 2450 xxx 10 15 96 WARNING Disconnect primary power prior to servicing ...

Page 135: ...ries 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 class A for ...

Page 136: ...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 rated at 50 W...

Page 137: ...le 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 capacitors are added as nee...

Page 138: ...pplication 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 In cases wh...

Page 139: ...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 resistance changes the volt...

Page 140: ...ched 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 PALs and U...

Page 141: ...l 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 module could be due to a problem...

Page 142: ...nk 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 cabinet The ...

Page 143: ... 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 problem with the PC...

Page 144: ...suring 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 appear at th...

Page 145: ... 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 Volts and enable the m...

Page 146: ...t 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 A 12 888 23...

Page 147: ... 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 PREMATURE FAILURE WARNI...

Page 148: ...e 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 surfaces ...

Page 149: ...nable 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 are all OK the mo...

Page 150: ... 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 Watts Low...

Page 151: ... 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 the trip point t...

Page 152: ...Table A 1 Summary of Module Specifications A 18 888 2365 001 888 2377 001 888 2378 001 10 16 95 WARNING Disconnect primary power prior to servcing ...

Page 153: ...Table A 2 Input Attenuators Driver Appendix A RF Amplifier Modules 10 16 95 888 2365 001 888 2377 001 888 2378 001 A 19 WARNING Disconnect primary power prior to servcing ...

Page 154: ...Table A 3 30 Watt Attenuators A 20 888 2365 001 888 2377 001 888 2378 001 10 16 95 WARNING Disconnect primary power prior to servcing ...

Page 155: ... 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 GLASS COVERED WITH SHA...

Page 156: ...B 2 888 2345 001 888 2353 001 888 2354 001 888 2365 001 WARNING Disconnect primary power prior to servicing ...

Page 157: ...r 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 possible without spl...

Page 158: ...rs 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 equipotential gr...

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