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APEX

™

Exciter Incorporating FLO

™

Technologyr

APEX Exciter Digital Assembly Overview

Theory of Operation

26

04s40

0.fm

03/08/07

888-2604-001

Page: 4-5

WARNING: Disconnect primary power prior to servicing.

4.3.2

RTAC and Adaptive Precorrector Board Theory

Adaptive precorrection is a process where an RF sample from somewhere along the trans-
mitter system is down converted to the 1st IF frequency in the down converter board,
converted to a digital signal in the ADC board, and the digitized sample is sent to the
adaptive precorrector board where it is time aligned with and compared to the reference
digital signal from the modulator board. The results of this comparison are used to pre
correct the digital output signal from the adaptive precorrector board so that it will cancel
certain distortions generated in the transmitter system power amplifiers and high power
filter (HPF).

Adaptive precorrection is divided into two general areas.

• Non linear correction: This refers to amplifier non linearity, which is poor linearity

(also referred to as AM to AM conversion) and ICPM (incidental carrier phase modu-
lation), also referred to as AM to PM conversion.

Non linear distortion causes intermodulation products to appear within the signal pass
band and in the adjacent channels, making it difficult or impossible for the transmitter
to pass the output signal mask response test without some type of amplifier lineariza-
tion.

• Linear correction: This generally refers to filter, tuned circuit, or coupling circuit dis-

tortions, which are amplitude response problems and group delay (also called PM to
PM conversion).

Linear distortions increase MER (modulation error rate) and degrades the transmitter
signal to noise performance.

The RTAC correction circuits perform their operations in several sequential steps, which
are as follows.

• The PA feedback signal is used by RTAC to correct non linear distortions generated

by the transmitter PA. This provides a near perfect input signal for the high power fil-
ter.

• The HPF feedback signal is used by RTAC to correct linear distortions generated by

the transmitter high power filter, and the smaller amounts of linear distortions caused
by tunable PAs.

The adaptive precorrection board is also capable of pre distorting the transmitter output
signal to correct for group delay caused by wave guide when it is used to transport the
transmitter RF output signal to the antenna. The waveguide type and length are entered in
exciter setup screen.

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Содержание APEX

Страница 1: ...T M No 888 2604 001 Copyright Harris Corporation 2007 All rights reserved Printed January 25 2007 Revision A 03 08 07 TECHNICAL MANUAL APEXTM Exciter Incorporating FLOTM Technology 888 2604 001...

Страница 2: ...not damaged Locate and retain all PACKING CHECK 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 r...

Страница 3: ...logy 2604ti fm March 8 2007 888 2604 001 Page i WARNING Disconnect primary power prior to servicing MANUAL REVISION HISTORY APEX Exciter Incorporating FLO Technology 888 2604 001 Rev Date ECN Pages Af...

Страница 4: ...APEX Exciter Incorporating FLO Technology Page ii 888 2604 001 March 8 2007 WARNING Disconnect primary power prior to servicing...

Страница 5: ...gnators for the item i e C001 R102 etc that corresponds to the number found in the schematics C001 in a bill of material is equivalent to C1 on the schematic or 2 gives added information or further ex...

Страница 6: ...APEX Exciter Incorporating FLO Technology Page iv 888 2604 001 March 8 2007 WARNING Disconnect primary power prior to servicing...

Страница 7: ...equipment local building codes and fire protec tion standards must be observed The following National Fire Protection Association NFPA standards are recommended as reference Automatic Fire Detectors N...

Страница 8: ...APEX Exciter Incorporating FLO Technology Page vi 888 2604 001 March 8 2007 WARNING Disconnect primary power prior to servicing...

Страница 9: ...as required D Arrange transportation to a hospital as quickly as possible 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...

Страница 10: ...APEX Exciter Incorporating FLO Technology Page viii 888 2604 001 March 8 2007 WARNING Disconnect primary power prior to servicing...

Страница 11: ...y Requirements 2 4 2 5 2 Typical Transmitter Systems Block Diagrams 2 4 2 5 3 Atlas Mobile Transmitters 2 5 2 5 3 1 Atlas Mobile Transmitter 1 PA Cabinet 2 Exciters 2 5 2 5 3 2 Atlas Mobile Transmitte...

Страница 12: ...tatus Screen 5 5 3 18 3 4 5 IF RF Processing Status Screens 3 19 3 4 5 1 UDC Interface Board Status Screen 1 4 3 19 3 4 5 2 PLL Board Status Screen 3 20 3 4 5 2 1 PLL Diagnostics 3 21 3 4 5 3 Up Conve...

Страница 13: ...Configure 1 5 3 48 3 6 7 2 FPGA Configure 2 5 3 49 3 6 7 3 FPGA Configure 3 5 3 50 3 6 7 4 FPGA Configure 4 5 3 51 3 6 7 5 FPGA Configure 5 5 Restore Defaults 3 52 3 6 8 Change Passwords Security Setu...

Страница 14: ...5 2 Digital Deck Power 4 14 4 5 2 1 Controller Board Power 4 14 4 5 2 2 FPGA Modulator Board Power 4 15 4 5 2 3 Adaptive Processing Board Power 4 15 4 5 2 4 Power for DAC and ADC Boards 4 15 4 5 2 5...

Страница 15: ...4 ASI Transport Stream Faults 5 18 5 8 Exciter Troubleshooting 5 19 5 8 1 Frequency Error 5 19 5 8 2 Dark Screen 5 19 5 8 3 Power Supply Voltages 5 20 5 8 4 Troubleshooting Down to the Board Level 5...

Страница 16: ...APEX Exciter Incorporating FLO Technology Table of Contents Page xiv 888 2604 001 03 08 07 WARNING Disconnect primary power prior to servicing...

Страница 17: ...us Screen 3 9 Figure 3 8 Adaptive Processing Diagnostics 3 11 Figure 3 9 Modulation Board Status Screen 3 12 Figure 3 10 Modulation Board Status Screen 1 2 3 12 Figure 3 11 ADC and DAC Status Screen 2...

Страница 18: ...2 Figure 4 2 APEX Exciter Signal Flow Block Diagram 4 4 Figure 4 3 The 44 4 MHz Phase Lock Loop 4 6 Figure 4 4 Exciter Output Spectral Response RTAC Bypassed 4 7 Figure 4 5 Up Converter Simplified Blo...

Страница 19: ...8 07 888 2604 001 Page xvii WARNING Disconnect primary power prior to servicing Figure A 1 Tera Term Pro Screen When Connected to Exciter A 2 Figure A 2 Stop Action Capture of Screen Down Load Scroll...

Страница 20: ...APEX Exciter Incorporating FLO Technology List of Figures Page xviii 888 2604 001 03 08 07 WARNING Disconnect primary power prior to servicing...

Страница 21: ...3 2 Location of System Setup Sub Screens 3 33 Table 3 3 Settings Resulting From Restore Defaults Activation 3 33 Table 3 4 UHF External I O Parallel Control Interface Connector J1 3 44 Table 4 1 Outpu...

Страница 22: ...APEX Exciter Incorporating FLO Technology List of Tables Page xx 888 2604 001 03 08 07 WARNING Disconnect primary power prior to servicing...

Страница 23: ...l distortions which occur in the transmitter RF power amplifiers high power filter and transmission line This APEX exciter incorporating FLO Technology is presently installed in the Harris Ranger and...

Страница 24: ...es from the rear and forced over the circuits The top and bottom covers may be removed to provide access to the digital and analog circuit boards however there are no adjustments on the circuit boards...

Страница 25: ...xciter Incorporating FLO Technology Physical Description Introduction 2604s100 fm 03 08 07 888 2604 001 Page 1 3 WARNING Disconnect primary power prior to servicing Figure 1 2 APEX Exciter Front Panel...

Страница 26: ...ncy precision and or accurate super frame timing for use with wide area single frequency network operation The exciter uses RTAC Real Time Adaptive Correction to monitor and manage pre correction for...

Страница 27: ...dance is 50 ohms Table 1 2 Harris APEX Exciter Service Conditions Specifications Specification Explanation Ambient temperature 0 to 50 celsius 32 to 122 fahrenheit Ambient humidity 0 to 90 relative no...

Страница 28: ...0 8 per 24 hours with no external reference 1 x 10 9 for SFN single frequency network with external reference Response variation 0 2 dB with the exciter in loopback mode Group delay 2 nsec with the ex...

Страница 29: ...be carefully studied before attempting to operate the exciter or check the exciter setup against the factory final test data 2 3 Signal Connections Most of the input and output connections are at the...

Страница 30: ...LAN 10Base T is a provision for connecting the exciter to a local area network RS232 on front and rear panels of exciter is a 9 Pin D interface connector They are used to communicate with various comp...

Страница 31: ...vel of 30 to 0 dBm average RF power The HPF sample monitors the output of the high power mask filter It uses this sample to characterize the amplitude response and group delay response of the filter F...

Страница 32: ...o the rear panel The correction algorithms like any feedback loop will drive the error to zero at the measurement point which is at the rear panel Use only a high quality 50 ohm coax such as RG223 Avo...

Страница 33: ...binet Atlas Mobile transmitter system is shown in Figure 2 3 It has dual exciters with the RF sample feedback connections shown Samples for each exciter are provided by two way zero phase splitters in...

Страница 34: ...upler The PA sample is taken from the cabinet combiner output coupler If the transmitter system has dual exciters feedback samples for each exciter are ob tained by splitting each sample cable as show...

Страница 35: ...t the two RTAC functions These refer to the two RF feedback signals which are connected to the rear panel of the exciter These settings determine how the exciter will pre correct for the transmitter s...

Страница 36: ...ation Power calibration is covered in Section 3 6 2 1 on page 3 38 Main Screen Setup RTAC Setup Can be used to avoid nuisance overdrive trips Is used to determine RTAC startup mode when the exciter or...

Страница 37: ...on the front panel Transport Stream hardware switch it will light green If both are missing the front panel Transport Stream and the Digital Processing hard ware switches will show faults light red Ma...

Страница 38: ...n Table 5 1 on page 10 The following is a list of the normal states of the more critical diagnostic functions and the exciter mute Status Adaptive Processing Diagnostics LoopBack None Test Tones Disab...

Страница 39: ...ZFSC 4 1 zero phase 50 ohm BNC Harris part number 620 2833 000 Used as needed to split or combine an RF signal Adapters N female to BNC male Harris part number 620 0128 000 Used to connect a BNC coupl...

Страница 40: ...APEX Exciter Incorporating FLO Technology Installation Materials Needed Page 2 12 888 2604 001 03 08 07 WARNING Disconnect primary power prior to servicing...

Страница 41: ...of the output power display On the main screen output power can also be set by touching the numbers in the power display This brings up a number pad where a new value for output power between 0 and 2...

Страница 42: ...o should range from 30 to 45 dB Error vector magnitude EVM does not apply to the Apex Flo exciter Integrated power of the lower sideband LSB and upper sideband USB over the spectrum of the lower and u...

Страница 43: ...w RTAC Digital signal taken at output of adaptive precorrector board BIT Sample of the Built In Test FIFO for future use Exciter RF signal is taken from J4 sample output of exciter PA and connected to...

Страница 44: ...near distor tions caused by the filters tuned circuits and other amplitude response shaping cir cuits in the transmitter system These distortions are frequency response errors called amplitude on the...

Страница 45: ...w Chart Main Screen Power Up Screen Setup Fault Note Selecting Home from any screen Selecting Fault from any screen Expanded Display Screen Status Displays returns to the Main Screen returns to the Ex...

Страница 46: ...Board Screen 1 of 5 Controller Board Screen 2 of 5 External I O Board Screen 3 of 5 CAN Status returns to the Main Screen returns to the Exciter Status Screen Selecting Status in any Status Screen re...

Страница 47: ...o the Exciter Status Screen System Setup Screen See page 3 32 Screen 1 of 2 Exciter Setup See page 3 35 RTAC Setup See page 3 38 Display Setup See page 3 41 Power Calibration See page 3 38 External I...

Страница 48: ...n These boxes represent circuit boards or control areas within the exciter see names in Table 3 1 The general status of each section OK or FAULT is displayed to the right of each box Touching any of t...

Страница 49: ...Status Screen The Transport Stream Status screen is shown in Figure 3 6 with screen entries listed below TS 1 Detect This selection indicates OK if the transport stream is present at the trans port st...

Страница 50: ...lowable level Each of the feedbacks listed below has a bar graph The yellow upper bar indicates average power level and the blue lower bar indicates peak level The presence of an RF sample which is wi...

Страница 51: ...input bit stream back to replace the A D converter output bit stream It tests the modulator and corrector boards Analog loops the 11 1 MHz IF output from the D A board to the IF input of the A D boar...

Страница 52: ...atus selection offers two selections which are The Modulator which consists of screen 1 the FPGA Modulator and screen 2 which gives the software revisions of the ADC DAC Boards See Modulator Board Sta...

Страница 53: ...the configuration of the FPGA which is a microprocessor FPGA prog OK or FAULT refers to the programing of the FPGA board EEPROM Ok or FAULT The EEPROM is the local board memory It stores board specifi...

Страница 54: ...Active or TS2 Active if one or both streams are connected to the two ASI inputs on the exciter rear panel The presence of one or both of the transport streams in indicated in the TS1 and TS2 Detect in...

Страница 55: ...th selected as show in the table be low SSF Arrival displayed in milliseconds Ave Frequency Error In Hz GPS 1PPS Loss YES in red indicates loss of GPS 1PPS NO in black indicated signal is present The...

Страница 56: ...nsport Stream Status screen are as follows TS1 Detect Yes or No TS2 Detect Yes or No Yes transport stream present No in red transport stream missing TS1 LOF Yes or No TS2 LOF Yes or No Yes in red faul...

Страница 57: ...The parameters of the SFN FIFO Status screen are as follows Core Stall YES in red indicates error NO in black indicated OK Overflow YES in red indicates error NO in black indicated OK Underflow YES in...

Страница 58: ...een 5 5 The parameters of the SFN FIFO Status screen are as follows Ver Err YES in red indicates error NO in black indicated OK Pkt Miss Count Displayed as an integer decimal Dropped Groups Displayed...

Страница 59: ...5 1 UDC Interface Board Status Screen 1 4 UDCInterfaceStatus bmp Figure 3 17 UDC Interface Board Status Screen 1 4 The UDC Interface Board screen is shown in Figure 3 17 with screen entries listed be...

Страница 60: ...r from UDC interface board via connector J1 15 Vdc Input power from UDC interface board via connector J1 8 Vdc Input power from UDC interface board via connector J1 IF PLL Lock YES or NO This PLL shou...

Страница 61: ...Reference entry is labeled Yes The Xtal Aging crystal oscillator aging control is used to set the frequency of the internal 10 MHz crystal oscillator when no external reference is used The initial se...

Страница 62: ...r output power level is set from the ex citer main screen or the extended control This is the normal setting When disabled for test purposes the exciter output power is locked in the previous enabled...

Страница 63: ...his soft key will restore the default values to tune A and tune B When tune A and or tune B values are changed they are automatically saved and will not revert to the default values after the exciter...

Страница 64: ...Source is set to monitor the exciter During each sample period the first action is to adjust the down converter gain to provide the A D converter with an IF signal of the correct amplitude During the...

Страница 65: ...the bottom of the screen The possible range is 0 4096 Sample levels can be viewed on the Adaptive Processing Screen RF Sample tells which down converter RF input sample is currently active RF Level T...

Страница 66: ...s of the internal PLL of the MPC823 micro controller on the controller board It indicates the internal 75 MHz clock is locked to the 32 768 KHz crystal oscillator Board Rev Board revision for the Cont...

Страница 67: ...egisters are required to handle the 16 status channels These entries are used for factory testing Foldback This in an analog input which tells the percent of exciter output power fold back typically d...

Страница 68: ...cal board memory It stores board specific information such as board type board revision CPLD revision and other lo cal data Note Within any of these screens touching Home returns to the main screen an...

Страница 69: ...f a volt of 2 Vdc analog inputs 2 and 4 will measure within a few tenths of a volt of 3 Vdc The VSWR foldback percentage will be based on the relative value of the loopback voltage VLB compared to the...

Страница 70: ...bmp Figure 3 27 CAN Bus Status Screen Information about the Can Status screen will be provided later 3 4 6 3 1 CAN Diagnostics A CAN Test Message is available on the CAN Diagnostics screen This funct...

Страница 71: ...information such as time and position shown on the screen but to do so the receiver must track three satellites The screen shows the number of visible satellites and the number of tracked satellites...

Страница 72: ...window appears The message in this window is Starting BIT requires exciter to be muted If the Ok soft key is pressed the exciter RF output is reduced to zero If the cancel soft key is pressed the exci...

Страница 73: ...a selection An alpha numeric key pad is displayed when a title is needed 3 6 1 Restore Defaults Operation Main Screen Setup System Setup screen Restore Defaults soft key function effects the followin...

Страница 74: ...ommon but customer s choice RF Present Cutoff 10mW 50 of normal exciter output power Serial Setup page 1 RS 232 Front and Rear See Section 3 6 6 1 Serial Setup Screen 1 of 3 RS 232 on page 3 45 Baud R...

Страница 75: ...GPS receiver use External is the normal mode If used it requires an external 1PPS input at the rear panel connector Loss of the 1PPS will cause a Digital Status hardware switch fault lights red and t...

Страница 76: ...Harris Atlas series UHF digital transmitters Waveguide Type For UHF frequencies enter the type of waveguide used between the HPF and the antenna Selecting a type and length of waveguide allows RTAC to...

Страница 77: ...actor by 0 5 dB intervals and stop when the shoulder level rises 5 Raise the Max Mod Crest Factor 0 5 dB above this point This is the correct set ting Mute soft key on right side of screen Mute When E...

Страница 78: ...on the right side of the screen in Figure 3 32 activates the exciter RF output power calibration procedure The power calibration is accomplished by connecting an accurate power meter to the RF output...

Страница 79: ...nsmitter maintenance and etc They are good for comparative testing Filter Set selections include 1 through 4 Filter Title Brings up an alpha numeric touch keypad to enter the name for the select ed fi...

Страница 80: ...roduce a peak stretch up to a 3 dB limit Nuisance overdrive trips can be avoided by programming the maximum peak stretch parameter of the RTAC Setup Screen The maximum peak stretch is adjustable from...

Страница 81: ...a list of entries on the System setup screen Date Enter the current date Time Enter the correct time The exciter will keep track of the date and time even during periods of power loss and display the...

Страница 82: ...e LCD display numeric key pad 3 6 5 External I O Setup Screen Some functions of the APEX digital exciter must be capable of being controlled operated via a parallel remote control system while other f...

Страница 83: ...ter output power from the normal exciter output power level VSWR F B input voltage below the low threshold down to the preset maximum allowable exciter output power reduction when the VSWR F B input v...

Страница 84: ...ng and channel to input output connector J1 assignments are fixed A list of channel entries J1 pin assignments corresponding channel numbers and the function input or output and its description is lis...

Страница 85: ...Setup Screen 1 of 3 RS 232 The purpose of the Serial Setup screen is to program the serial ports on the front and rear panel of the exciter Since the setup parameters for the front and rear connector...

Страница 86: ...er A the IP address is 192 168 217 200 For exciter B the IP address is 192 168 217 201 The IP addresses for eCDi units with software revisions earlier than 2 6 are as follows For exciter A the IP addr...

Страница 87: ...as follows Default is 1Hz Rate for PowerCD Diamond and SigmaCD transmitters is 2 Hz Improper Baud or Tx Frame rates will lock up the CAN bus The solution to this problem is to set the rates correctly...

Страница 88: ...FPGA when changed through the GUI No FPGA re initialization occurs when any of these registers are changed The parameters of the FPGA Configure 1 5 screen are as follows Transmitter ID Unsigned 16 bi...

Страница 89: ...s with a range 0 to 2000 When the GPS 1PPS signal loss shown in the Main Screen Status Digital Pro cessing FLO FPGA Registers GPS and Clock Status screen exceeds the 1PPS Mute Delay time the GPS 1PPS...

Страница 90: ...ons NTWK Geog Delay Time in microseconds see below for calculations The value for Transmitter Delay shall be displayed in integer microseconds with a valid range and the value for the FPGA register va...

Страница 91: ...s follows Bandwidth 5MHz 6MHz 7MHz 8MHz National Length Unsigned Decimal range dependent on bandwidth 0 245 5MHz 0 295 6MHz 0 345 7MHz 0 395 8MHz Pos Pilot Length 2 6 10 14 not bandwidth dependent WID...

Страница 92: ...efaults Initialize FPGA Save as Defaults Restore Factory Defaults loads all FPGA registers with the values defined as default initialization values in the API if defined followed by a re initializatio...

Страница 93: ...ure 3 46 on page 3 54 if it is locked The frequency select and frequency offset entries on the exciter setup screen are locked when the diagnostics setup is locked If either password change screen is...

Страница 94: ...up functions will remain unlocked If Ok is selected the user setup functions will be locked To gain access to the setup functions the System Setup User Setup Locked screen must be entered This time an...

Страница 95: ...being tested 3 6 9 Restore Defaults The restore defaults soft key on the System Setup screen see Figure 3 46 is locked under the Factory Setup password 3 7 RTAC Operating Procedures Main Screen RTAC...

Страница 96: ...hich down converter sample is currently active RF Level RF level taken after the AGC circuit for the current sample It typically ranges between 0 5 to 1 0 Vdc for samples of proper input power range I...

Страница 97: ...nd etc They are good for comparative testing of the transmitter and RTAC correction Filter Set selections include 1 through 4 Filter Title Brings up an alpha numeric touch keypad to enter the name for...

Страница 98: ...APEX Exciter Incorporating FLO Technology Navigating the LCD Display Screens RTAC Operating Procedures Main Screen Page 3 58 888 2604 001 03 08 07 WARNING Disconnect primary power prior to servicing...

Страница 99: ...n top performance Control and monitoring of the exciter is provided by a front panel display and remote control connection and in some transmitters exciter control is also extended to the trans mitter...

Страница 100: ...e signal following the modulation and spectral filtering processes Two down converted samples from various locations along the transmitter system are compared the output of the modulator board to shap...

Страница 101: ...troller board controls all of the other boards except the power supply and the fan It indirectly controls the output amplifier through the APC automatic power control and the mute function A built in...

Страница 102: ...verted RF Switch Down Converter Board PLL Board 1st L O 2nd L O 10 MHz Reference Exciter Sample Input PA Sample Input HPF Sample Input Exciter RF Output DAC ADC Adaptive Precorrector Board FPGA Modula...

Страница 103: ...PM conversion Non linear distortion causes intermodulation products to appear within the signal pass band and in the adjacent channels making it difficult or impossible for the transmitter to pass th...

Страница 104: ...set to 6 MHz The available bandwidth settings are 5 6 7 and 8 MHz For each setting the actual signal bandwidth is approximately 0 5 MHz less than the indicated bandwidth the actual bandwidth for each...

Страница 105: ...A2 Output Amplifier board A5 Down Converter board Refer to Figure 4 2 for a block diagram of the APEX exciter The up converter accepts a 11 1 MHz IF from the DAC digital to analog converter board A12...

Страница 106: ...ut of the up converter is a low level on channel signal This signal is sent to the output amplifier 4 4 1 1 Up Converter Board UHF VHF Band Pass Filter The type of filter used depends on the operating...

Страница 107: ...F high power filter output The RF level for each sample should be within a range of 30 to 0 dBm average power where the RF sample cables enter the rear panel connectors of the exciter The controller b...

Страница 108: ...method is via a control voltage form the DAC The DAC number is supplied from the controller board and locks the 10 MHz oscillator to the 1 PPS pulse per second output of a GPS Satellite This is the m...

Страница 109: ...DDS direct digital synthesis based oscillator which is clocked at 400 MHz The 400 MHz is generated in a single loop PLL phase locked loop which is locked to the 10 MHz reference oscillator Figure 4 8...

Страница 110: ...equency range This chosen frequency is applied to a divide by N circuit where N is chosen so that its output or a harmonic of its output falls on the desired second LO frequency A tunable bandpass fil...

Страница 111: ...1 then to relay K1 which routes the output to the RF output jack J2 when the exciter is unmuted and to the RF load output jack J3 when muted Directional coupler DC1 samples the forward power of the am...

Страница 112: ...wer for the digital lower deck of the exciter enters the controller board at J6 J6 is mounted on the chassis side of the board and protrudes through the deck to the top side where it receives 5 Vdc fr...

Страница 113: ...rter GPS 5 Vdc refers to the 5 volt supply for the GPS receiver 4 5 2 3 Adaptive Processing Board Power The adaptive precorrector board receives 5 VDC from the controller board This is the 5 Vdc entry...

Страница 114: ...upplies 15 Vdc to the UDC up down converter Interface board via connector J4 See Table 4 3 on page 14 for a list of pin assignments for J4 15 Vdc is fed to an on board switching dc to dc converter and...

Страница 115: ...en 15 Vdc Input power 15 Vdc Input power 8 Vdc Input power 4 5 3 4 PLL Board Power The PLL phase lock loop board receives its dc voltages 15 Vdc and 8 Vdc from the UDC interface board via connector J1...

Страница 116: ...in 3 8 Vdc Input power from UDC interface board via connector J1 pin 5 An on board regulator produces 5 Vdc from the 15 Vdc supply 15 Vdc is supplied to the output amplifier from the Up Converter boar...

Страница 117: ...er cooling fan The bottom side of chassis houses the FPGA modulator adaptive pre corrector DAC digital to analog converter converter ADC analog to digital converter controller and the UHF external I O...

Страница 118: ...FLO Technology Maintenance and Troubleshooting Exciter Maintenance Page 5 2 888 2604 001 03 08 07 WARNING Disconnect primary power prior to servicing 8439153013A PLT Figure 5 1 Top View of Exciter Ana...

Страница 119: ...nology Exciter Maintenance Maintenance and Troubleshooting 2604s500 fm 03 08 07 888 2604 001 Page 5 3 WARNING Disconnect primary power prior to servicing 8439153013B PLT Figure 5 2 Bottom View of Exci...

Страница 120: ...hooting Exciter Maintenance Page 5 4 888 2604 001 03 08 07 WARNING Disconnect primary power prior to servicing Figure 5 3 APEX Exciter Wiring Diagram Left Side see Figure 5 4 for right side Note Figur...

Страница 121: ...e and Troubleshooting 2604s500 fm 03 08 07 888 2604 001 Page 5 5 WARNING Disconnect primary power prior to servicing Figure 5 4 APEX Exciter Wiring Diagram Right Side see Figure 5 3 for left side Note...

Страница 122: ...caused by a faulty PLL board 5 1 2 1 Measuring Center Channel Frequency A special procedure which removes all transmitted data leaves only one center channel carrier This allows the channel center fr...

Страница 123: ...rough 6 will contain written information When a successful connection is established use the left or right arrow key to access page 7 the blank page 8 Enter the following commands to turn off modulati...

Страница 124: ...ll take the exciter off the air A The output level should be 10 dBm 2 The 1st local oscillator frequency is affected by the 10 MHz reference oscillator A If the reference oscillator is off frequency t...

Страница 125: ...ions provided with the software The serial port used for the software upgrade must be set up to use the Harris protocol See Section 3 6 6 1 Serial Setup Screen 1 of 3 RS 232 on page 3 45 for serial po...

Страница 126: ...ne A UHF up converter tunable notch filter Values depend on UHF channel see Note 1 Tune B UHF up converter tunable B P filter RF IF Processing Screen 4 of 4 Section 3 4 5 4 1 Down Converter Diagnostic...

Страница 127: ...tput if exciter is used to control transmitter output power RTAC Setup Section 3 6 3 RTAC Setup Screen on page 3 38 Filter Type Use FLO BANDPASS for this exciter Other Apex exciter application may use...

Страница 128: ...xcessive MER Troubleshooting Flow Chart on page 5 15 Figure 5 5 Frequency Error Troubleshooting Flow Chart Is Exciter set to correct frequency Exciter Setup Screen N Y Set to correct frequency Frequen...

Страница 129: ...ing Main Screen Power Control Power limit should be set higher than the required exciter output power See Setup Exciter screen 2 2 Y If power level at RF output of exciter is still low call technical...

Страница 130: ...the Status Adaptive Processing screen normal See Figure 3 7 on page 3 9 N Y This screen shows the PA feedback sample level see Notes 2 Is this feedback sample out of range or Faulted Note 2 In Adaptiv...

Страница 131: ...evels are correct Yellow average level and blue peak level Refer to Section 3 4 3 Adaptive Processing Board Status Screen on page 3 9 for additional information Y N If one or more diagnostic functions...

Страница 132: ...it illuminates The screen saver may have been active Troubleshooting a dark screen is covered in Sec tion 5 8 2 on page 5 19 3 Are there any fault indications on the LCD display or front panel LEDs A...

Страница 133: ...PA or driver If two successive amplifiers are both fairly non linear and especially if they have dif ferent non linearity curves correction at the output of the PA will be difficult if not impossible...

Страница 134: ...O w RTAC Digital signal taken at output of adaptive precorrector board BIT Sample of the Built In Test FIFO for future use Exciter RF signal is taken from J4 sample output of exciter PA and connected...

Страница 135: ...he 10 PLL Lock and the 10 kHz reference statuses will read N A since the 10 MHz oscillator is locked to the 1PPS signal via the FPGA modulator board the controller board and the PLL board DAC If a fau...

Страница 136: ...power before the plastic shield is re moved from the analog tray The test meter is to be located outside the shield and the plastic shield replaced prior to applying power All of the power supply vol...

Страница 137: ...board From there it goes to the DAC board the output of which is the 11 1 MHz first IF signal The first IF signal goes to the input of the up converter board in the analog tray 5 8 4 2 Analog Tray Si...

Страница 138: ...viewing the analog loopback main screen On Air Data the SNR should be better then 32 dB and the LSB and USB lower and upper side bands should be better than 38 dB The chart source Post HPF Pre HPF an...

Страница 139: ...in at amplifier connector J5 pin 7 unmuted 4 Vdc and muted 0 Vdc 5 8 6 Isolating a Faulty Board in the Digital Tray Isolating a faulty board in the digital tray involves checking the status screens of...

Страница 140: ...roubleshooting defective ADC or DAC boards is covered in Section 5 8 5 1 Checking Operation of the Entire Digital Tray on page 5 21 5 8 6 4 Front Panel Board Troubleshooting a defective front panel bo...

Страница 141: ...t of input and output signal levels Analog board frequency measurements are covered in Section 5 1 2 on page 5 6 Measure the PM noise of the CW signal outputs of the PLL board see Table 5 5 Phase Nois...

Страница 142: ...Offset relative to CW signal Phase Noise PSD dBc Hz Frequency Offset relative to CW signal Phase Noise PSD dBc Hz 10 Hz 50 100 kHz 110 100 Hz 80 1 MHz 120 1 kHz 90 1 MHz 120 10 kHz 95 Table 5 6 Output...

Страница 143: ...PF001 556 0170 000 ATTEN FIXED 5DB 2W SMA 3 EA AT001 AT002 AT003 610 1253 000 MALE CONNECTOR 4C 1 EA 628 0014 000 ADAPTOR SMA JACK TO BNC JACK 1 EA 646 0665 000 INSPECTION LABEL 1 EA 646 1487 000 NAME...

Страница 144: ...PWA A D CONVERTER 1 EA A11 992 9995 013 PWA ADAPTIVE PRECORRECTOR 1 EA A9 992 9995 015 PWA UDC INTERFACE 1 EA A6 992 9995 030 PWA UPCONVERTER 1 EA A3 992 9995 033 PWA UHF BAND PASS FILTER 1 EA 992 99...

Страница 145: ...r d but do not hit any other key as prompted The lo cation and file name for the screen capture must be entered first continue with step 7 The program will wait while this step is being performed 7 On...

Страница 146: ...cing C Press the close soft key to close the log file 10 If you want to capture another screen after closing the log file select Control and then Reset terminal Press Enter twice and return to step 5...

Страница 147: ...ond Drive Transmitter Exciter GUI Screen Captures 2604sapa fm 03 08 07 888 2482 001 Page A 3 WARNING Disconnect primary power prior to servicing Figure A 3 Tera Term Log Window Selected When Download...

Страница 148: ...Sigma CD3 Diamond Drive Transmitter Exciter GUI Screen Captures Page A 4 888 2482 001 03 08 07 WARNING Disconnect primary power prior to servicing...

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