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Nautel Vector-LP VR125, Техническое руководство по эксплуатации

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Page 6-30 

Vector-LP Radio Beacon Transmitter Technical Instruction Manual 

Issue 1.1 

Section 6  Theory of Operation 

6.7 MODULATION DEPTH WHEN 
USING A HIGH ‘Q’ ANTENNA 

When the transmitter's output is connected to 
a high 'Q' antenna system, the modulation 
envelope observed on the RF current 
waveform may differ from that on the RF 
voltage waveform. This difference is caused 
by antenna impedance mismatch at the 
sideband frequencies, which results in 
reflected power standing waves on the feed 
cable. Depending upon feed cable length, the 
sideband impedance may be more or less 
than 50 

:

. When the sideband impedance is 

less than 50 

:

, the sideband current will 

increase and may place undesirable stress 
on the solid state devices in modulator/power 
amplifier. 
 
When calibrating the modulation limits for the 
monitor (see 3.6.7), the system automatically 
tests using both current and voltage samples 
and selects the sample that places most 
stress on the transmitter (i.e., the highest 
modulation depth). 
 
The following explanation should assist in 
understanding this phenomenon. 
 

A typical radiobeacon antenna is relatively 
inefficient, since it is very short when 
compared with the wavelength of the carrier 
frequency. The high capacitive reactance of a 
typical antenna is tuned to the carrier 
frequency, by an antenna tuning unit's (ATU) 
loading coils, to produce a series resonant 
circuit. The resulting net antenna system 
resistance is then transformed to 50 

:

 by a 

matching transformer. When the antenna is 
very short compared with the wavelength of 
the carrier frequency, the series resonant 
circuit has an extremely high 'Q'. Under these 
conditions, the antenna system may present 
a 50 

:

 load to the transmitter at the carrier 

frequency but different impedance at the 
sideband frequencies. 
 
The mismatch at the sideband frequencies 
will cause a standing wave on the feed cable. 
Depending upon the length of the feed cable, 
the sideband impedance of the antenna 
system will appear to be more or less than 
50 

:

. When the transmitter is connected to a 

high 'Q' antenna system, the difference 
between the carrier impedance and the 
sideband impedance may cause RF stress 
current limits to be exceeded. When this 
occurs, remedial action must be taken 
instantly. 
 
 

Содержание Vector-LP VR125

Страница 1: ...ckett s Cove NS Canada B3Z 3J4 T 877 6 nautel 628835 or 1 902 823 2233 F 1 902 823 3183 info nautel com U S customers please contact Nautel Inc 201 Target Industrial Circle Bangor ME 04401 T 877 6 nau...

Страница 2: ......

Страница 3: ...arranty replacement parts and repair which are provided under items 2 or 3 shall be guaranteed for a period of ninety days from date of shipment or until the end of the original warranty period whiche...

Страница 4: ...s is at no charge to the customer When the warranty has expired a charge of 80 of the list price for all exchanged modules is made If the faulty module is returned to Nautel within 30 days a credit is...

Страница 5: ...ng the equipment there is a risk of receiving a severe or fatal electrical shock ELECTROSTATIC SENSITIVE Indicates a part or assembly is or contains devices that are electrostatic sensitive To prevent...

Страница 6: ...ceramic which is non hazardous during normal device operation and under normal device failure conditions These devices are specifically identified in the equipment parts list s by including BeO in the...

Страница 7: ...rectional Radio Beacon Transmitter Vector NDB 125 250 is in compliance with the essential requirements and other relevant provisions of Directive 1999 5 EC This subject equipment is intended for use i...

Страница 8: ......

Страница 9: ...ork Area 2 1 2 2 1 7 Power Source Switch 2 1 2 2 2 Lightning Protection 2 2 2 2 3 Station Reference Ground 2 2 2 2 4 Ac Power Source 2 2 2 2 4 1 Ac Wiring 2 2 2 2 5 Antenna Feed Cable 2 7 2 2 6 Antenn...

Страница 10: ...itor Requirements 2 14 2 3 6 Installing External Control Monitor Wiring 2 14 2 3 7 Installing Ac Power Source Wiring 2 15 2 3 8 Installing Dc Power Source Wiring Optional 2 15 2 4 COMMISSIONING 2 17 2...

Страница 11: ...3 Setting Maximum Output Limitations 3 29 3 6 12 4 Using Factory Settings 3 29 3 6 13 Viewing and Setting Peripherals 3 30 3 6 13 1 Setting the Keyer 3 30 3 6 13 2 Viewing Power Module Status 3 31 3 6...

Страница 12: ...5 14 5 9 BATTERY BOOST ASSEMBLY REPLACEMENT 5 14 6 THEORY OF OPERATION 6 1 INTRODUCTION 6 1 6 2 TRANSMITTER OVERVIEW 6 1 6 3 AC_DC POWER STAGE 6 1 6 3 1 Interface PWB 6 5 6 3 2 Ac Dc Universal Input...

Страница 13: ...ED WIRING PATTERNS 8 1 8 4 WIRE COLOURS 8 1 8 5 WIRING LISTS PROVIDED 8 1 8 5 1 Connector Mating Information 8 1 9 ELECTRICAL SCHEMATICS 9 1 INTRODUCTION 9 1 9 2 COMPONENT VALUES 9 1 9 3 GRAPHIC SYMBO...

Страница 14: ...y Band 2 16 3 1 Front Panel System Diagram Controls and Indicators 3 5 3 2 Front Panel Control Section Controls and Indicators 3 7 3 3 Exciter Interface PWB Controls and Indicators 3 9 3 4 Remote Inte...

Страница 15: ...Remote Interface PWB A3 3 10 3 6 NAPE70C RF Synthesizer PWB A5 and A8 3 12 3 7 NAPS35 Battery Boost PWB A16A1 Optional 3 16 3 8 Diagnostic Display Meters Screen 3 18 3 9 Diagnostic Display Main Menu...

Страница 16: ......

Страница 17: ...eacon Transmitter Technical Instruction Manual Feb 24 09 Release Control Record Issue Date Reason 1 0 03 December 2007 Initial approved release of manual 1 1 24 February 2009 Added information for sho...

Страница 18: ......

Страница 19: ...drive generation circuitry and low voltage power supplies x Has provision for single side or dual side A and B RF power sections which can be manually or automatically selected x Can be serially conn...

Страница 20: ...onnects to an N type connector The ac power cable connects to a standard ac line connector The dc power cabling if applicable connects to a terminal block External input RF drive and control and outpu...

Страница 21: ...ise measurement of RF voltage across dummy load during calibration procedures Frequency counter 5 ppm up to 10 MHz Fluke model 1900A Measure carrier frequency Oscilloscope Tektronix model T922 Testing...

Страница 22: ...isible part of a character May be either a dot or a dash Frame Selected fixed interval of time that is sufficiently long to accommodate the beacon identification signal and an interval of continuous t...

Страница 23: ...sist in determining cable lengths and routing 2 2 1 2 Transmitter Weights Refer to Table 1 1 for transmitter weights Sufficient manpower or lifting apparatus is required to move the transmitter 2 2 1...

Страница 24: ...path to the earth The transmitter cabinet s designated station reference ground point the shield of the coaxial feed cable and the ground connection of the power source s surge protection devices mus...

Страница 25: ...con Transmitter Technical Instruction Manual Page 2 3 2 4 Blank Section 2 Preparation for Use and Installation Issue 1 1 Figure 2 1 Vector LP Transmitter Environment Considerations SHOWN MOUNTED IN DE...

Страница 26: ......

Страница 27: ...nsions mm inches Customer Interface to Vector LP Transmitter Issue 1 1 Not to Scale Figure 2 2 Page 2 5 2 6 Blank BACK OF TRANSMITTER BACK OF FRONT PANEL AC INPUT 90 270 V ac 1 PHASE L L OR L N RF MON...

Страница 28: ......

Страница 29: ...and associated switching components and wiring must meet the following requirements 2 2 8 1 Ac Voltage Source The VR250 can operate from a 170 to 270 V ac 50 Hz line to neutral or 60 Hz line to line...

Страница 30: ...located at the back of the transmitter If the transmitter is installed in the deluxe or short cabinet mounting option the RF output connector is located on top of the cabinet If the transmitter is in...

Страница 31: ...tely NOTE External control circuits connect to the transmitter circuits through opto couplers on the remote interface PWB The opto couplers buffer isolate the external circuits and prevent any transie...

Страница 32: ...ly open single pole switch When closed press to talk it should apply a ground to TB1 12 If the press to talk information is phantom fed on the audio shield TB1 15 the switching circuit is not required...

Страница 33: ...ld be applied to a station modulation monitor with a 50 input impedance It may also be monitored by an oscilloscope during maintenance procedures The RF MONITOR output will be a nominal 1 V RMS into a...

Страница 34: ...PWB is used in conjunction with a bank of user supplied batteries attached in such a manner as to provide 24 V dc VR125 only or 48 V dc and suitable current to allow the system to operate in battery b...

Страница 35: ...is specifically identified When required replacement hardware should be identical to the items being replaced 2 3 1 Acceptance of Shipment Inspect all shipments for transmitter damage prior to accepta...

Страница 36: ...ich options are required to interface with the external equipment 2 3 6 Installing External Control Monitor Wiring Connect the wiring from the remote control monitoring devices to the remote interface...

Страница 37: ...see ATU manual 2 3 7 Installing Ac Power Wiring NOTE The following procedures assume the ac power is supplied from a single phase 50 60 Hz ac power source between 170 and 270 V ac for VR250 or betwee...

Страница 38: ...Table 2 7b RF Filter PWB Tap Settings vs Frequency Extended Frequency Band Connect Input to E1 Frequency kHz E5 to E18 to E22 to E35 to Jumper 1 Jumper 2 Jumper 3 Jumper 4 Jumper 5 Jumper 6 Jumper 7 5...

Страница 39: ...will be disabled Implement a fail safe method to alert personnel to this fact Dangerous voltages are present on RF output stages and the antenna system if the transmitter is on b Close all external in...

Страница 40: ...o step y s Set power to 0 W Press RF Off Set the active side to B t There should be no alarms indicated on the System Diagram or the GUI u In the Meters menu use the f or g buttons to display the aver...

Страница 41: ...BLE RF CABLE UNIT SPU1 J1 AC INPUT OPTIONAL OR FEEDER GROUND GROUND INT SERIAL LINK RF FEED FROM TRANSMITTER AUX CABLE NDB DGPS REFERENCE DENOTES CABLE LENGTH TO BE SERIAL LINK PTSN RS 232 RS 422 USB...

Страница 42: ......

Страница 43: ...remove the ac or dc power source voltage from the transmitter or inhibit any of the internal low voltage dc supplies or the B power supply If the reason for the shutdown requires all voltages be turne...

Страница 44: ...transmitter or when it is not being subjected to maintenance procedures Electronic components should be stored in anti static materials 3 4 3 Tools Test Equipment Testing and maintenance equipment inc...

Страница 45: ...or off and increase or decrease and its operator control source local or remote The RF Off switch is functional regardless of local or remote selection Refer to Figure 3 3 and Table 3 2 for a descrip...

Страница 46: ...and Exciter Controls and Indicators Table 3 6 describes the miscellaneous controls and indicators of the control display PWB and exciter assemblies that were not covered in previous paragraphs Refer t...

Страница 47: ...tching power supplies that supply the RF power modules This alarm will initiate a changeover in dual transmitters the side of the transmitter designated as standby will be operating as the active side...

Страница 48: ...Page 3 6 Vector LP Radio Beacon Transmitter Technical Instruction Manual Issue 1 1 Section 3 Operating Instructions Figure 3 3 Vector LP Transmitter Front Panel Control Section...

Страница 49: ...tton switch that sets control of transmitter functions to switches on the front panel When its integral lamp is on amber by pressing the switch Local control has been selected When Local control is se...

Страница 50: ...26 R27 R29 R30 CR8 C15 E8 2 1 E9 2 1 R13 CR24 R36 C10 CR27 CR28 CR26 C16 C17 C18 C22 R4 R5 R3 Q4 Q3 R8 R6 R12 R10 R14 CR1 CR3 CR2 R37 R38 C27 R32 R16 C13 C14 C21 E4 1 A K CR4 L2 1 E6 R19 R21 R22 CR5 L...

Страница 51: ...s Shorting jumpers that are installed in positions determined by the type of transmitter In NDB transmitters the jumpers are factory installed in position 2 No user adjustment is required E4 E5 E6 E7...

Страница 52: ...3 10 Vector LP Radio Beacon Transmitter Technical Instruction Manual Issue 1 1 Section 3 Operating Instructions Figure 3 5 Part of NAPI78B 02 Remote Interface PWB A3 E18 E5 E8 E17 E11 E13 E15 E4 R37...

Страница 53: ...x A differential input is selected when the jumper shorts pins 1 and 2 of its associated 3 pin header x A single ended input is selected when the jumper shorts pins 2 and 3 of its associated 3 pin hea...

Страница 54: ...F G C1 C24 C26 C34 C57 C58 1 J1 L2 R21 R46 R47 R52 Q1 Q2 Q3 R27 R17 C4 1 E4 1 E3 U13 U10 R9 R8 R44 R42 R38 R37 R35 R34 R33 R29 R28 R26 R25 R23 R22 R20 R13 R12 R11 R10 Q4 L10 L1 CR6 CR5 CR4 C56 C54 C48...

Страница 55: ...Always set for INT internal gc shorting pins 2 and 3 for Vector LP transmitters E5 Drive Matching Seven selection jumper A G used to configure the RF drive circuit for its host transmitter The jumper...

Страница 56: ...TRIM Adjusted when interphase PDM driver PWB is enabled the associated exciter is the active exciter Compensates for tolerance differences between side A and side B in dual side transmitters One or b...

Страница 57: ...transmitter s RF output A12A2DS1 or A13A2DS1 AC IND When turned on amber indicates the ac input voltage is being applied to RF power module A or B A12A2DS2 or A13A2DS2 18V When turned on green indica...

Страница 58: ...R4 Q1 Q7 R39 C20 1 E9 1 E10 R26 R27 R28 R29 Q3 R25 E3 E1 C1 C8 U3 Q6 R11 CR3 R32 R30 CR5 C14 C10 R8 R21 R19 R1 R14 E6 1 E5 R13 CR2 R33 2 3 4 1 5 U2 R31 R10 CR4 R22 C9 U4 R20 R6 R7 R9 L3 R17 R16 R18 R...

Страница 59: ...ction jumper that is installed in the position determined by the backup battery voltage The jumper is installed in the 48V position shorting pins 1 and 2 if a 48 V battery is used The jumper is instal...

Страница 60: ...s 3 8 and 3 9 display x Transmitter status bar x Three user definable meter selections x Meter selection scroll controlled by f and g pushbuttons x Sub menu selections x Software version 3 6 2 1 Trans...

Страница 61: ...alibrate Analog Meter 3 6 8 3 Power Source Select 3 6 9 Configure Sonalert 3 6 10 Timed Shutdown 3 6 11 Factory Settings 3 6 12 Calibrate Digital Meters 3 6 12 1 Set Thresholds 3 6 12 2 Maximum Output...

Страница 62: ...VSWR 1 00 0 1 2 Main Menu Status Power 12 43 16 Power 0W Side A Bypass 12 43 16 Power 0W Side A Bypass Currently Active Faults Command RF OFF Reset Meters 12 43 16 Power 0W Side A Bypass Currently Act...

Страница 63: ...A1 Missing 08Apr80 12 33 13 Return to normal 08Apr80 12 33 13 Command Exciter B 08Apr80 12 33 13 Low AC Voltage 08Apr80 12 33 02 Power Up 08Apr80 12 32 56 Mod Protection Select 000 Alarms Only Back 1...

Страница 64: ...re that the transmitter is operating at the desired power level before computing the new thresholds If the power level of the transmitter changes after computing the thresholds re establish the thresh...

Страница 65: ...ning message indicates ensure that the transmitter is operating at the minimum allowable modulation depth before computing the thresholds If the transmitter is to operate in both PTT and Normal modes...

Страница 66: ...urrent NOTE Modulation A and B refers to the modulation read by monitor board A and B respectively Modulation refers to the active monitor board Set up the displayed parameters as follows a Use f and...

Страница 67: ...When the analog meter is calibrated press Done 3 6 9 Selecting Power Source Select the transmitter s power source and view power source related parameters as follows a From the main menu highlight Set...

Страница 68: ...y timed shutdown parameters as follows Select Meters 12 43 16 Power 0W Side A Bypass Main Menu Changeover Control Events Log Settings Peripherals RCMS Settings Vector NDB rev 1 0 4 1 Jul 27 2007 13 52...

Страница 69: ...ghlight Settings using f and g and press Select Highlight Factory Settings and press the f and left soft key simultaneously Press Yes to display the following options b Press f or g to scroll through...

Страница 70: ...ow ac voltage and high reflected power cutback levels Less critical settings such as diagnostic display contrast and speaker volume audio can also be adjusted Set these thresholds as follows CAUTION P...

Страница 71: ...When complete press Done Press Reset to restore the value to its pre modified setting d When complete return to previous menu by pressing Back A prompt appears to confirm saving modifications to the E...

Страница 72: ...be calibrated to match side A x There are two values displayed for each Pot The left hand value is for side A The right hand value is for side B The side B Pot value should be the side A Pot value mu...

Страница 73: ...me Timing 20 0 sec Legend MK All Marks SP All Spaces AL Alternating Marks Spaces KY Keyed String Reset Next Cancel 12 43 16 Power 0W Side A Bypass 12 43 16 Power 0W Side A Bypass Frame Sequence MK MK...

Страница 74: ...xciter control assembly a The screen below appears if the ATU is in local mode of operation and auto tuning is active and is tuned This screen allows viewing of ATU status only No adjustments are poss...

Страница 75: ...PWB as follows a Use f and g to highlight the desired peripheral Press Select to activate x If the site interface PWB A2A4 is installed select Site Control Board x If a Nautel ATU is used and a seria...

Страница 76: ...gic level determines the active state for the control point s remote input NOTE Control points 1 through 16 correspond to inputs connected to CONTROL POINT 1 through 16 on TB3 of the remote control mo...

Страница 77: ...automatically report transmitter alarms without needing to poll the status as follows a A list of transmitter alarms and their current Automatic Reporting status is displayed x To configure an alarm f...

Страница 78: ...wer changes in 1 W steps x ATU Current Feedback toggles between ON and OFF Not used for ATU500 c Press Done when complete NOTE The transmitter regulates the antenna current to the ATU Current Setpoint...

Страница 79: ...and the Section 3 Operating Instructions and in particular the section on controls and indicators NOTE The diagnostic display s meters screen displays three pre determined parameters e g forward power...

Страница 80: ...Page 4 2 Vector LP Radio Beacon Transmitter Technical Instruction Manual Issue 1 1 Section 4 Testing and Adjustment Figure 4 1 Exciter Panel and Rear View...

Страница 81: ...of this manual was completed b Ensure the ac or dc power source is turned off or disconnected c Terminate the transmitter s RF output into a suitably rated precision 50 load that is able to accuratel...

Страница 82: ...rate a change in a control points state See Configuring the Sonalert 3 6 10 4 3 5 2 SETTING LOW BATTERY THRESHOLD If a dc power source battery is used see Selecting Power Source 3 6 9 to set the DC di...

Страница 83: ...set the high and low power limits and press Compute New Thresholds g In the Mod Thresholds screen see 3 6 7 press Compute New Thresholds in beacon PTT inactive and beacon and voice PTT active modes se...

Страница 84: ...ess Reset in the Status menu The transmitter should switch back to the main side and the Changeover LED should no longer be on g Select Main Menu Peripherals Keyer Settings Audio Levels h Note the mod...

Страница 85: ...to OFF Set the Tone Frequency to 400 Hz or 1020 Hz c In the Audio Levels menu see 3 6 13 1 set Keying Pot to 0 d Press RF On Increase the transmitter s output to desired power e In the Audio Levels me...

Страница 86: ...feedback to ON NOTE When antenna current feedback is enabled the transmitter will adjust the output power to ensure that antenna current remains constant With each power adjustment a new high and low...

Страница 87: ...termine the tap settings for the six jumpers Connect the jumpers to the appropriate taps d Turn on the ac and dc circuit breakers e Install the rear cover on the transmitter and perform the calibratio...

Страница 88: ...nt should be within 20 of the actual value In the Calibrate Meters menu see 3 6 12 and 3 6 12 1 calibrate the Forward Power x Scroll through the parameters until Forward Power is highlighted Press Mod...

Страница 89: ...tall the external current probe on the shorting jumper b In the Set Thresholds menu see 3 6 12 and 3 6 12 2 set the Slowback Pwr Per Block value to 100 W c Set RF output power to 0 W Press RF On Monit...

Страница 90: ...on the control display PWB d In the Set Thresholds menu see 3 6 12 and 3 6 12 2 scroll to the Low AC Voltage threshold Press Modify e Adjust the Low AC Voltage value until the voltage at TP19 matches...

Страница 91: ...3 6 12 3 calibrate the duty cycle and forward power as follows x Highlight the value for Set Duty Cycle Press Modify x Change the value to match the positive duty cycle measured at TP17 in step c Pres...

Страница 92: ...t of a power failure Press Yes each time this prompt is displayed during the setup procedure g In the Power Source Select menu change the transmitter s Requested Power Source to DC see 3 6 9 h Press R...

Страница 93: ...e display with the RF signal see Figure 4 2 Figure 4 2 CW signal set to fill display d Adjust the position of the oscilloscope signal so that the bottom of the CW waveform is at the mid point of the d...

Страница 94: ...nt select Main Menu Peripherals Keyer Settings Audio Levels h Adjust the Keying Pot in Press to talk mode adjust the PTT Keying Pot to get the desired level of modulation This adjustment will affect b...

Страница 95: ...installation 5 2 1 Cleaning the Transmitter As a minimum perform the following cleaning procedures NOTE A site located in a dirty area using open air cooling requires more extensive cleaning than a s...

Страница 96: ...ction must be taken Refer to paragraph 5 5 to determine the troubleshooting action required for a given fault 5 3 2 Off Air and Standby Side Troubleshooting Off air troubleshooting is performed when p...

Страница 97: ...s a flow diagram that indicates the operational status of various sections of the transmitter If a lamp is on red a fault is occurring in the associated section of the transmitter x The diagnostic dis...

Страница 98: ...replaced as detailed in paragraph 5 8 1 2 NOTE For dual side transmitters a changeover to the standby side should also occur Determine which side caused the fault noting it is the opposite side to th...

Страница 99: ...n the standby side Power Supply High Temp PS A or B Check fans Ensure they are spinning at an adequate speed a minimum of 3000 RPM see 3 6 13 2 If necessary replace the appropriate fan N A N A Power S...

Страница 100: ...y have been and the tone is at an adequate level replace the exciter monitor generator PWB side A A7 or side B A10 As long as this fault persists output power is inhibited 5 8 2 4 3 5 5 if applicable...

Страница 101: ...el 1 18 If the average peak reflected power exceeds 30 W VR250 or 15 W VR125 the transmitter enters the next highest cutback level 1 18 When the reflected power level falls below 30 W VR250 or 15 W VR...

Страница 102: ...repaired module is on the standby side Replace the RF filter PWB A14 Tables 2 7a and 2 7b 4 3 6 2 Replace the control display PWB A1 Verify all jumper settings on the replacement PWB are the same as...

Страница 103: ...he transmitter These screws are no longer required c Remove the cable connected near the top of the RF power module by releasing the spring latches on either side of the connector then unplugging the...

Страница 104: ...dware TOP COVERS Remove five M4 screws from top cover for each RF power module Reinstall this hardware after module replacement SHIPPING SCREWS Remove two M4 screws from bottom for each RF power modul...

Страница 105: ...FET by shorting the gate and source Using a digital multimeter momentarily place the negative lead on the gate pin and positive lead on the source pin for each FET in the circuit c Measure the drain...

Страница 106: ...el by opening the hinged front panel c Replace the appropriate assembly or PWB see 5 8 1 5 8 2 or 5 8 3 5 8 1 Exciter Interface PWB and Interconnecting PWB Replacement See 5 8 first The exciter interf...

Страница 107: ...nsmitters perform the Equalizing Exciter Gain adjustment procedure see 4 3 6 10 For a single side transmitter perform the Calibrating Transmitter Output Power adjustment procedure see 4 3 6 3 5 8 1 3...

Страница 108: ...as part of the entire battery boost assembly A16 For ease of maintenance it should be replaced as an assembly as described in this paragraph a Press the Control RF OFF switch Switch off the ac power...

Страница 109: ...wer supply 170 V to 270 V ac for VR250 90 V to 270 V for VR125 using switch mode power supplies A 48 V dc input option and 24 V dc for VR125 only can also be purchased Emission is continuous carrier N...

Страница 110: ......

Страница 111: ...OR MODULATOR SMPS DC DC LVPS DC POWER DUAL AC DC VDC A STAGES CONTROL MONITOR RF DRIVE MOD DRIVE CONTROL MONITOR RF POWER STAGE EXTERNAL CONTROL MONITOR B2050017 VB RS232 RS422 EXT SERIAL LINK PTSN FO...

Страница 112: ......

Страница 113: ...pplies The transmitter s ac input is applied to U2 and U3 and the regulated 24 5 V 15 6 V 5 6 V and 15 5 V supplies are provided on the output The outputs are applied through the interface PWB to the...

Страница 114: ...ay for the main side will be energized closing the contact and providing voltages to the main PDM driver and RF synthesizer The relay for the standby side will be open The RF relay control FET Q5 sele...

Страница 115: ...ically controlled oscillator with a 48 bit phase accumulator and 12 bit digital to analog converter DAC The phase accumulator which is responsible for generating an output frequency is presented with...

Страница 116: ...of shorting shunt posts E1 E2 and E4 determine which source is selected Vector transmitters use the internal source 6 4 2 9 1 Internal gc Source To use the integral numerically controlled oscillator...

Страница 117: ...phisticated filtering of the transmitter s B power supply and maintains the transmitter s RF output at the original level for B voltage variations of 10 GAIN TRIM potentiometer R31 provides a nominal...

Страница 118: ......

Страница 119: ...ONITOR INTERFACE OPTIONAL INT SERIAL LINK OPTIONAL TO FROM AC DC POWER STAGE KEYED TONE EXT AUDIO B KEYED TONE EXT AUDIO A CONTROL MONITOR INT SERIAL LINK PWB EXCITER INTERFACE VDC A VDC B RELAY CONTR...

Страница 120: ......

Страница 121: ...re the PDM duty cycle again reaches 45 the control display PWB initiates a B voltage increase to 167 V for VR125 236 V for VR250 and a PDM duty cycle decrease to 32 6 4 3 5 1 PDM1 Generator The PDM1 g...

Страница 122: ...s RF power stages when faults are detected or actions are initiated that may cause RF stress current thresholds to be exceeded Its function is to de energize K1 and disconnect the PDM 1 output from t...

Страница 123: ...his will guarantee that the U11 is always operating as intended 6 4 4 2 PRESS TO TALK The input to U11 11 indicates to the exciter monitor generator PWB which mode of operation it should be operating...

Страница 124: ...5 1 Control Display PWB See Figures SD 5 through SD 8 The control display PWB A1 performs the following functions x Produces dc voltage Carrier Ref A and B outputs that ultimately determine the forwa...

Страница 125: ...F output is instantly shut back turn off The system diagram s Output Network lamp displays a fault condition A Refld Pwr Sample signal is applied to ADC U9 for application to the front panel s diagnos...

Страница 126: ...which represents the current drawn by the transmitter s optional battery supply The input is filtered through operational amplifier U3A and associated components The bat_cur_sample signal is applied t...

Страница 127: ...s U11 and U17 The ATU controls the DE RE signal J3 5 allowing the ATU to specify direction of transmission through the isolated link preventing collisions over the serial bus 6 5 2 3 RS232 and RS422 I...

Страница 128: ...cause for the cutback 6 5 3 2 DIAGNOSTIC DISPLAY The diagnostic display is a graphic user interface GUI screen that is navigated using five associated soft keys The majority of the transmitter s local...

Страница 129: ...solated inputs are driven by isolated dc to dc converter U1 to prevent unwanted transients from affecting the transmitter s dc supplies The monitor inputs are shifted in through shift registers U6 and...

Страница 130: ...protection from high voltage transients AC IND lamp DS1 provides a status indication of the ac voltage on the RF power module 6 6 1 1 2 Switching Signal IC U3 is a high current FET driver that provide...

Страница 131: ...power MOSFET Q1 as its on off control 6 6 1 3 3 B Switching MOSFET Power MOSFET Q1 is connected to switch the B voltage at the on off ratio of the PDM data on U1 s HO output which is applied to its g...

Страница 132: ......

Страница 133: ...ROL VDC RF DRIVE B PDM B RF DRIVE A PDM A RF POWER MODULE OUTPUT B RF POWER MODULE OUTPUT A RF FILTER VDC AC POWER FROM AC DC POWER STAGE FROM EXCITER SERIAL LINK CONTROL MONITOR MONITOR RF OUTPUT TO...

Страница 134: ...DC CONTROL MONITOR B VDC MONITOR VDC RF POWER TO RF FILTER STAGE INTERFACE FANS VDC MODULATOR RF DRIVE MODULATOR AMPLIFIER CONTROL MONITOR FROM AC DC Fpdm PDM CONTROL MONITOR VDC RF DRIVE PDM INT SERI...

Страница 135: ...edance is precisely 50 the RF current waveform is in phase and of equal amplitude to the RF voltage waveform on one half of T1 s center tapped secondary and equal amplitude but 180q out of phase on th...

Страница 136: ...n should assist in understanding this phenomenon A typical radiobeacon antenna is relatively inefficient since it is very short when compared with the wavelength of the carrier frequency The high capa...

Страница 137: ...requency is passed through the primary of the transformer and transformed to its secondary If the filter is designed to pass the switching frequency but attenuate its harmonics a sine wave is applied...

Страница 138: ......

Страница 139: ...e alphanumerically sorted reference designation lists 7 3 2 When Ref Des Is Known When the full reference designation is known the information for a part can be located as follows x Refer to the famil...

Страница 140: ...ility during manufacture 7 5 5 OEM Code Column This column typically contains a five digit coded group as the original equipment manufacturer s OEM identifier The code was extracted from Cataloging Ha...

Страница 141: ...CRONYMS The following abbreviations acronyms may appear in Description column DIP Dual In line Package IDC Denotes item is an Insulation Displacement connector for ribbon cable MTA Denotes item is a M...

Страница 142: ...ng Corporation 45496 Digital Systems 50434 Agilent Technologies Incorporated 54583 TDK Electronics Corporation 56289 Sprague Electric Company 56699 BC Components 56845 Vishay Dale Electronics Incorpor...

Страница 143: ...E INTERFACE NAPI79 OR NAPI80 A12 RF POWER MODULE NAP35 01 125 D200 NAP35 250 D375 A12A4 MODULATOR FILTER NAPF06 A12A5 MODULATOR NASM11 VECTOR LP NARB18 DUAL NDB DGPS A10 EXTERNAL MONITOR GENERATOR PWB...

Страница 144: ......

Страница 145: ...05 1016 Cableform Assy REFDES NAUTEL DESCRIPTION VENDOR OEM CODE P01 JP65 Conn Rcpt Housing 12 Pin Metrimate 211759 1 09482 P02 JT50 Conn Plug 3 Pin Mate N Lok 350766 1 00779 P03 JT50 Conn Plug 3 Pin...

Страница 146: ...6 Connector Quick Dis M 1 4 Tab PWB 1287 91833 E02 HR26 Connector Quick Dis M 1 4 Tab PWB 1287 91833 E03 HR26 Connector Quick Dis M 1 4 Tab PWB 1287 91833 E04 HR26 Connector Quick Dis M 1 4 Tab PWB 12...

Страница 147: ...205208 1 09482 P09 JT16 Conn Lock Screw D Sub Male 205980 1 09482 P10 JR38 Conn Socket D Sub HDP 20 25 pin 205207 1 09482 P10 JT16 Conn Lock Screw D Sub Male 205980 1 09482 P11 JR38 Conn Socket D Sub...

Страница 148: ...640551 2 09482 P26 JU26 MTA Keyed Closed End Housing 12pin 22AWG 1 644463 2 00779 P27 JR38 Conn Socket D Sub HDP 20 25 pin 205207 1 09482 P27 JT16 Conn Lock Screw D Sub Male 205980 1 09482 P28 JT40 C...

Страница 149: ...ept Ribbon Cable 40 pin 746288 9 00779 W07P1 JP45 Conn Recept Ribbon Cable 20 pin 746288 4 00779 W07P2 JP45 Conn Recept Ribbon Cable 20 pin 746288 4 00779 W10P1 JP51 Conn Recept Ribbon Cable 40 pin 74...

Страница 150: ...Line Assy SJT 250V 10A 17569 VOLEX P02 JDP22 Conn Coax N Plug 50ohm Crimp RG58 82 5375 02660 TB01 JF27 Terminal Block 4 Pos Double 61A G10 4 5Y407 TB02 JF27 Terminal Block 4 Pos Double 61A G10 4 5Y40...

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