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CIRCUIT DESCRIPTION

6-10

September 1994
Part No. 001-2008-300

6.3.6  FORWARD/REVERSE POWER DETECT, 

CIRCULATOR, LOW-PASS FILTER

The power amplifier output is directly coupled to 

the forward/reverse power detect board via a jumper.  
The output then enters the circulator and exits to the 
low-pass filter board and the antenna jack for a mini-
mum power output of 75W at the default setting.  If an 
antenna is not connected, the circulator connects the 
output power to R685.

Forward and reverse power is electromagnetically 

coupled to the detectors on the input and reflected 
ports of the circulator.  R663 and R680 calibrate the 
forward and reverse sense levels.  The sensed levels 
are coupled to the RF Interface Board and software.

6.4 RF INTERFACE BOARD

The RF Interface board connects the Receiver, 

Exciter and Power Amplifier to the backplane and 
power supply (see Figure 6-6).

The input and output connectors for the RF Inter-

face board are defined as follows.

6.4.1  POWER CONNECTOR

The power supply is connected to the RF Inter-

face Board when the RF module is inserted into the 
Universal Station cabinet (see Figure 10-3).  The jack 
portion of the connection is on the RF Interface Board, 
the plug portion is attached to the Universal Station 
cabinet.

P1

Ground

Ground return for the RF assembly.

P2

Ground

Ground return for the RF assembly.

P3

+15V DC

Supply voltage to Exciter, Receiver and Power 

Control. 15V, 1.5A.

P4

+26.5V DC

Supply voltage to PA.  +26.5V, 12A nominal 

(16A max) at 75W.

P5

+26.5V DC

Supply voltage to PA.  +26.5V, 12A nominal 

(16A max) at 75W.

6.4.2  SIGNAL CONNECTOR (J101)

The signal interface connector J101 (36 pin) that 

connects the RF Interface board to the backplane con-
nector J2 (34 pin) through cable assembly A8.

Pin 1

Ground

Carries ground current between the RF Interface 

board and Backplane board.

Pin 2

PC STR

Power Control Strobe.  Normally low until after 

the power control data is shifted into the power control 
register.  Then the strobe line goes high and back to 
low.  The clock or data lines cannot be changed until 
after the strobe is set.

Pin 3

HS CS EX

Not used at this time.

Pin 4

Ground

Carries ground current between the RF Interface 

board and Backplane board.

Pins 5-6 UNUSED

Pin 7

RX WBAND

The wide band audio is from the receive audio 

demodulator U202 and goes to the TPI card in the 
Controller card cage.  The typical amplitude is 387 
mV RMS (-6 dBm) and 2V DC with Standard TIA 
Test Modulation into the receiver.  Little wave shaping 
is done on the receiver board other than a 31 kHz RC 
LPF which strips off the 450 kHz IF.  Buffering is 
done with an op-amp.

Содержание 242-2008-332

Страница 1: ...VIKING VX 800 MHz UNIVERSAL STATION Part No 242 2008 332 First Printing September 1994 Part No 001 2008 300 9 94mwp Printed in U S A ...

Страница 2: ......

Страница 3: ...atmospheres The transmitted radio energy could trigger blasting caps or cause an explosion DO NOT operate the radio without the proper antenna installed DO NOT allow children to operate or play with this equipment NOTE The above warning list is not intended to include all hazards that may be encountered when using this radio This device complies with Part 15 of the FCC rules Operation is subject t...

Страница 4: ......

Страница 5: ...ION 2 1 INTRODUCTION 2 1 SITE PREPARATION AND ANTENNA INSTALLATION 2 1 2 2 ENVIRONMENT 2 1 2 3 VENTILATION 2 1 2 4 AC POWER 2 1 2 5 BATTERY BACKUP 2 2 2 6 GROUNDING 2 2 PROTECTION GUIDELINES 2 3 2 7 UNPACKING AND INSPECTION 2 3 3 SOFTWARE 3 1 INTRODUCTION 3 1 HOW TO USE THIS MANUAL 3 1 GETTING STARTED 3 1 COMPUTER DESCRIPTION 3 1 FLASH DATA STORAGE 3 1 COMMAND LINE OPTIONS 3 2 COLOR OR MONOCHROME ...

Страница 6: ...SELECT REPEATER TO EDIT 5 1 5 2 ADDING A REPEATER TO A FILE 5 1 6 CIRCUIT DESCRIPTION 6 1 RECEIVER 6 1 INTRODUCTION 6 1 REGULATED VOLTAGE SUPPLIES 6 1 HELICAL FILTER L201 L203 RF AMPLIFIER Q201 6 1 FIRST MIXER U201 CRYSTAL FILTER Z201 Z202 6 1 IF AMPLIFIER Q202 CRYSTAL FILTER Z203 Z204 6 1 SECOND MIXER DETECTOR U202 6 2 WIDEBAND AUDIO AMPLIFIER U203B 6 3 RSSI AMPLIFIER U203A 6 3 VCO A006 6 3 ACTIV...

Страница 7: ...20 5V CONVERTER 6 20 POWER SUPPLY REPAIR AND ALIGNMENT 6 20 6 7 BATTERY BACK UP MODULE 6 21 OPERATION 6 21 CHARGER 6 21 REVERSE BATTERY PROTECTION 6 22 ENGAGING THE RELAY 6 22 OVER UNDERVOLTAGE SHUTDOWN 6 22 BBM FAN CONTROL 6 23 6 8 CARD RACK 6 23 6 9 EXTERNAL CONNECTOR BOARD 6 24 6 10 THIRD PARTY INTERFACE 6 25 INTRODUCTION 6 25 MICROPROCESSOR U7 6 26 RECEIVE AUDIO 6 27 RECEIVE SQUELCH CIRCUITRY ...

Страница 8: ...Y ADJUST 7 1 VCO TEST 7 1 FRONT END ADJUSTMENTS 7 1 AUDIO DISTORTION 7 2 7 2 EXCITER ALIGNMENT 7 3 PRETEST 7 3 VOLTAGE MEASUREMENTS 7 3 PROGRAM TUNE UP CHANNEL 7 3 VCO TEST 7 3 TCXO FREQUENCY ADJUST 7 3 TRANSMIT MODULATION ADJUST 7 3 7 3 POWER AMPLIFIER ALIGNMENT 7 5 INTRODUCTION 7 5 DRIVER TUNING AND LIMIT ADJUSTMENTS 7 5 FORWARD POWER OUTPUT CALIBRATION 7 6 REFLECTED POWER ADJUST 7 6 7 4 FULL RE...

Страница 9: ... MHz 75W UNIVERSAL STATION 9 1 STATION ASSEMBLY 9 1 STATION ENCLOSURE 9 2 TRANSCEIVER MECHANICAL 9 2 CONTROLLER BACKPLANE 9 2 EXTERNAL CONNECTOR BOARD 9 3 POWER SUPPLY FILTER BOARD 9 3 RF INTERFACE BOARD 9 3 RECEIVE VCO 9 5 RECEIVER 9 6 TRANSMIT VCO 9 9 EXCITER 9 9 75W POWER AMPLIFIER 9 11 FORWARD REVERSE POWER DETECTOR 9 13 POWER AMPLIFIER MECHANICAL 9 14 THIRD PARTY INTERFACE CARD 9 14 INTERFACE...

Страница 10: ...CE CARD SCHEMATIC 2 OF 2 10 28 10 29 BACKPLANE COMPONENT LAYOUT CARD SIDE 10 29 10 30 BACKPLANE COMPONENT LAYOUT OPPOSITE CARD SIDE 10 29 10 31 BACKPLANE SCHEMATIC 10 30 10 32 800W POWER SUPPLY COMPONENT LAYOUT OPP COMP SIDE 10 31 10 33 800W POWER SUPPLY COMPONENT LAYOUT COMP SIDE 10 33 10 34 800W POWER SUPPLY SCHEMATIC 1 OF 2 10 34 10 35 800W POWER SUPPLY SCHEMATIC 2 OF 2 10 35 10 36 BATTERY BACK...

Страница 11: ...RNAL CONNECTOR TERMINAL BOARDS 6 25 6 11 U7 BLOCK DIAGRAM 6 27 6 12 S500 S507 6 33 6 13 J1 ALARM OUTPUTS 6 33 6 14 J2 ALARM OUTPUTS 6 34 6 15 ALARM EXAMPLE 6 35 6 16 THIRD PARTY INTERFACE CARD LOGIC BLOCK DIAGRAM 6 42 6 17 THIRD PARTY INTERFACE CARD AUDIO BLOCK DIAGRAM 6 42 6 18 INTERFACE ALARM CARD BLOCK DIAGRAM 6 42 7 1 RECEIVER ALIGNMENT POINTS 7 2 7 2 EXCITER ALIGNMENT POINTS 7 4 7 3 POWER AMP...

Страница 12: ...TABLE OF CONTENTS CONT D viii LIST OF TABLES 1 1 ACCESSORIES 1 2 1 2 ACTIVE ALARMS 1 7 5 1 REPEATER SETUP PARAMETERS 5 2 8 1 CHIP INDUCTOR IDENTIFICATION 8 6 8 2 CERAMIC CHIP CAP IDENTIFICATION 8 6 ...

Страница 13: ... plugs into the Third Party Interface TPI card jack The speaker provides local audio and is adjusted by the volume control Programming Cable Kit This cable provides the connectors for the Universal Station and a computer The cable is used during programming and monitoring Universal Station activity at the site Extender Card Used to extend the cards plugged into the backplane beyond the card rack e...

Страница 14: ... Fri day There is also a 24 hour emergency technical sup port telephone number From within the continental United States the Customer Service Department can be reached toll free at 1 800 328 3911 When your call is answered at the E F Johnson Company you will hear a brief message informing you of numbers that can be entered to reach various departments This number may be entered during or after the...

Страница 15: ...rning equipment A service representative may be able to suggest a solu tion to the problem so that return of the equipment would not be necessary Be sure to fill out a Depot Repair Request Form 271 for each unit to be repaired whether it is in or out of warranty These forms are available free of charge by calling Depot Repair see Section 1 6 or by requesting them when you send a unit in for repair...

Страница 16: ...l CR2 is the high power indicator and CR3 is not assigned at this time Alarms When the Repeater is in the test mode the safety measures are disabled Therefore if the Universal Station is keyed for an extended period and the power amplifier temperature increases thermal shutdown will not occur There are pop up windows that will appear in the Test mode screens to alert the user that there is an alar...

Страница 17: ...dicator Indicates that the Universal Station s transmitter is keyed by the logic 1 11 3 POWER SUPPLY The power supply is sealed and the line and sup ply fuses are inside If a supply fuse opens the power supply must be removed and opened for repair see Section 2 4 and 8 5 Refer to the power supply ser vice manual 004 2000 810 Standby Battery Jack This provides a connection point for a 24V DC standb...

Страница 18: ...tive IAC input 2 Active IAC input 3 Active IAC input 4 Active IAC input 5 Active IAC input 6 Active IAC input 7 Active IAC input 8 Active MAC Processor Alarm HSDB Processor Cable Alarm IRDB Cable Alarm RNT CIM Channel Problem Alarm TIC Processor Alarm MMC Processor Alarm VNC Alarm AC Power Failure Battery Power Failure Power supply thermal sense Fan 1 current out of specification Fan 2 current out...

Страница 19: ...purious Image Rejection 90 dB Audio Squelch Sensitivity 12 dB SINAD Audio Response 1 3 dB TIA Audio Distortion Less than at 0 5W 16 ohms Local Audio Power 0 5W 16 ohms Audio Sensitivity 1 5 kHz Hum Noise Ratio 45 dB Frequency Spread 6 MHz Frequency Stability 1 PPM 30 C to 60 C 22 F to 140 F TRANSMITTER Frequency Band 851 869 MHz RF Power Out 75W minimum Default setting 25W Variable Set Point Spuri...

Страница 20: ...INTRODUCTION AND OPERATION 1 8 September 1994 Part No 001 2008 300 This page intentionally left blank ...

Страница 21: ... not exceed 100 µg m3 NOTE If the Universal Station is installed in an area that exceeds these environmental conditions the site should be equipped with air filters to remove dust and dirt that could cause the equipment to overheat 2 3 VENTILATION The RF module and the power supply are equipped with fans controlled by thermostats that force air from the front to the back of the equipment for cooli...

Страница 22: ...ndicators are provided to show Reverse Battery con nection Charger On Off and Battery Fault Figure 2 1 BATTERY BACKUP CONNECTOR B B TEMP ACTIVE CHARGER ON CHARGER FAULT BATTERY BATTERY REVERSE GROUND EARTH NEUTRAL LINE SWITCH Figure 2 2 TEMPERATURE SENSOR CABLE 2 6 GROUNDING CAUTION PROPER SITE GROUNDING AND LIGHTNING PROTECTION ARE VERY IMPORTANT TO PRE VENT PERMANENT DAMAGE TO THE UNIVER SAL STA...

Страница 23: ...next to reduce the remainder of the current surge and a high powered three element gas tube fires grounding Tip and Ring 2 6 1 PROTECTION GUIDELINES Follow these guidelines for grounding and light ning protection Each Universal Station installation site is different all guidelines may not apply to a given situation Ground connections are a good metal to metal ground grounding rod grounding tray me...

Страница 24: ...Universal Stations vertically especially for bottom ventilation slots in high power Universal Stations NOTE Each Universal Station should be grounded separately by connecting a ground bus from the ground lug on the back side of the RF module to the ground bar on the rack see Figure 2 3 Figure 2 5 RACK MOUNTED UNIVERSAL STATIONS TX RX GROUND 33 34 ALARMS 1 2 J2 J3 M A M B R X S R X S T X S T X S E ...

Страница 25: ... and delete files and run programs If you are unfamiliar with any of these actions refer to the MS DOS manual for your computer for more informa tion see Section 5 Follow the computer instructions for loading the disk The MS DOS Revision 3 3 or later operating system is needed to run the programs The computer needs to have RS 232C capability for example the Serial port in slot COM1 or COM2 3 1 3 C...

Страница 26: ...d 3 1 6 COLOR OR MONOCHROME OPERATION The programming software utilizes color for a color monitor and video card However with LCD type displays this may make some information hard to read because the contrast is poor To improve con trast a monochrome mode can be selected in the dis play mode from Utilities heading 3 2 REPEATER PROGRAM SOFTWARE 3 2 1 INSTALLING THE SOFTWARE When you receive the pro...

Страница 27: ...system manual for command explanations 3 3 1 PROGRAM FILES The files that appear in the program directory are needed for program operation 3 4 ALIGNMENT SOFTWARE The software for the Universal Station programs the TPI to open and close the audio data gates neces sary for the alignment selected from the Test Full Uni versal Station menu Under the menu heading Test are the alignment procedures for t...

Страница 28: ...ITIES HELP F1 TRANSFER Revisions Repeater Type Write Setup Params F6 Read Setup Params F5 Setup Parameters F4 RF Data Exciter Receiver Display Mode COM Port PA Quit ALT X DOS Shell Save As Delete Repeater Alarm Configuration Select Repeater Alarm Display Load Save Full Rptr Station Print Config About User Level ...

Страница 29: ... filename from a disk can be entered in the highlighted area Then move the cursor down with the arrow key and highlight Ok and press Enter To select an existing file use the arrow keys to move down the menu list and press Enter when the high lighted filename is the file to load Figure 4 2 LOAD FILE 4 2 2 SAVE This saves the edited version of an existing file loaded in the buffer under the same fil...

Страница 30: ...is for reference only It is not necessary for repeater operation CHANNEL NUMBER Each Universal Station is programmed with a number of the channel that it is operating on 1 920 If the operating frequency of a Universal Station is changed this channel number must also be changed see Appendix A RF POWER LEVEL This is the default power level Enter the power level 25 75 Watts that the Universal Station...

Страница 31: ...l for transmitting the alarm message in Morse code 1 255 min 0 disabled If more than one alarm is active this is the inter alarm time CROSS REFERENCE The cross reference screen selects the output alarm that is activated by each input alarm There are up to 48 alarms 0 47 8 external input alarms and 40 internal alarms see Table 1 2 There are eight output alarms An alarm condition on any input can ca...

Страница 32: ...yed to show the programming of the Universal Station Figure 4 14 READ SETUP PARAMETERS Figure 4 15 READING SETUP Select which Output Alarm is activated by each Input Alarm 8 None 24 None 32 None 40 None 5 None 6 None 7 None 9 None 10 None 11 None 12 None 13 None 14 None 15 None 17 None 18 None 19 None 20 None 21 None 22 None 23 None 25 None 26 None 27 None 28 None 29 None 30 None 31 None 34 None 3...

Страница 33: ... 4 18 REVISION VERSION 4 6 TEST Figure 4 19 TEST MENU 4 6 1 POWER AMPLIFIER This menu selection walks through the align ment of the Power Amplifier and RF Interface Board on the computer screen Refer to Section 7 3 for the PA and RFIB alignment in this manual and Figures 7 3 and 7 4 for an alignment points diagram and Figure 7 7 of the Power Amplifier 4 6 2 RECEIVER This menu selection walks throu...

Страница 34: ...TILITIES Figure 4 20 UTILITIES MENU 4 7 1 COM PORT This is the COM port used to send and receive data from the TPI card An interface cable connects the Universal Station to the computer 4 7 2 DISPLAY MODE This screen allows the color mode to be selected for color monitors When using a non color laptop monochrome is recommend for better resolution 4 7 3 ALARM DISPLAY This screen displays a scrollin...

Страница 35: ...alarms are to be configured 8 Program the Alarms to be configured see Section 4 3 3 press F2 to accept 9 Highlight FILE press Enter 10 Highlight Save press Enter 11 Type in a valid DOS filename For this example sta1 qx is used 12 The file consists of default and Rptr 1 under the file name of sta1 qx 5 2 ADDING A REPEATER TO A FILE The example used for Station 1 will again be used to add repeaters ...

Страница 36: ...umber from 1 20 Channel Number 1 920 Each Universal Station is programmed with the Receive fre quency that it is operating on RF Power Level 25 75 Power level in watts for transmit power Power Source AC or DC The type of primary power source for the Universal Station Press F2 to Accept Channel Number 100 Repeater Number 1 Universal Station Setup Parameters Edit RF Power Level 75 Power Source AC Re...

Страница 37: ...203 C204 provide bypassing Addi tional filtering of the receive signal is provided by three pole helical filter L204 L206 A section of microstrip on the collector of Q201 and C205 C207 match the impedance from Q201 to the filter 6 1 4 FIRST MIXER U201 CRYSTAL FILTER Z201 Z202 First mixer U201 mixes the receive frequency with the first injection frequency to produce the 52 95 MHz first IF Since low...

Страница 38: ...r frequency of 450 kHz and a bandwidth of 15 kHz used for added receiver selectiv ity The limiter amplifies the 450 kHz signal then limits it to a specific value From the limiter the signal is fed to the quadra ture detector An external phase shift network con nected to U202 pin 8 shifts the phase of one of the detector inputs 90 at 450 kHz the other inputs are unshifted in phase When modulation o...

Страница 39: ...urrent does not change and transistor current remains constant R803 decouples the VCO output from AC ground L803 is an RF choke and C807 C808 C810 and C811 provide RF bypass 6 1 11 BUFFER Q208 Q209 A cascode amplifier formed by Q208 and Q209 provides amplification and also isolation between the VCO and Synthesizer A cascode amplifier is used because it provides high reverse isolation The input sig...

Страница 40: ...and A registers do not change during shifting because the transfer of data to the registers is controlled by ENABLE The 13 LSBs of the R register are double buffered Data is latched into the first buffer on a 16 bit transfer The second buffer of the R register contains the 13 bits for the R counter This second buffer is loaded with the con tents of the first buffer when the A register is loaded a ...

Страница 41: ...can be counted In this example the prescaler divides by 65 for 65 x 43 or 2 795 input pulses It then divides by 64 for 64 x 950 43 or 58 048 input pulses The overall divide number K is therefore 58 048 2 795 or 60 843 The VCO frequency of 760 5375 MHz divided by 60 843 equals 12 5 kHz which is the fR input to the phase detector The overall divide number K can also be determined by the following fo...

Страница 42: ...ier to pro vide filtering of the 12V supply to Q802 R801 and R802 provide transistor bias and C809 provides the capacitance that is multiplied If a noise pulse or other voltage change appears on the collector the base volt age does not change significantly because of C809 Therefore the base current does not change and tran sistor current remains constant R803 is the low impedance collector load fo...

Страница 43: ...quency is 12 5 kHz for all frequencies selected by this exciter The fV input is produced by dividing the VCO frequency using the prescaler and N counter in U403 The prescaler divides by 64 or 65 The divide number of the prescaler is controlled by the N and A counters in U403 The N and A counters function as follows One input signal is the reference frequency fR This frequency is the 17 5 MHz TCXO ...

Страница 44: ...Interface on J102 pin 16 for detec tion and sampling in the IAC 6 2 7 BUFFER AMPLIFIER Q410 Q411 A cascode amplifier formed by Q410 and Q411 provides amplification and also isolation between the VCO and exciter RF stages A cascode amplifier is used because it provides reverse isolation The input signal to this amplifier is tapped from VCO A007 C441 provides DC blocking Bias for the amplifier is pr...

Страница 45: ...tion sig nals of relatively equal phase and amplitude is present on both ends of the balancing resistor Therefore no current flows and no power is dissipated in the bal ance resistor If one final failed half the drive power would be dissipated by the resistor and the other final would continue to function 6 3 4 POWER DETECTORS U504A U502B Electromagnetic coupling is used to sample the output of ea...

Страница 46: ...he plug portion is attached to the Universal Station cabinet P1 Ground Ground return for the RF assembly P2 Ground Ground return for the RF assembly P3 15V DC Supply voltage to Exciter Receiver and Power Control 15V 1 5A P4 26 5V DC Supply voltage to PA 26 5V 12A nominal 16A max at 75W P5 26 5V DC Supply voltage to PA 26 5V 12A nominal 16A max at 75W 6 4 2 SIGNAL CONNECTOR J101 The signal interfac...

Страница 47: ...om the RF 3 Multiplexer with a logic high Pin 20 LPTT The Logic Push To Talk is an open collector from the Controller It has a sink capability of 20 mA and a maximum voltage rating of 18V The transmit ter should produce power when this pin is a logic low Pin 21 SYN CS EX The main Synthesizer Chip Select in the Exciter that allows input of data to the specific synthesizer chip when the line is pull...

Страница 48: ... Receiver Pin 31 GROUND Carries ground current between the RFIB and Chassis Backplane Pin 32 36 UNUSED 6 4 3 FAN CONNECTORS J104 J105 The outputs to the fan connectors are 4 pin plug in terminals that supply DC voltage The plug on the fan is a 2 pin connector The plug in terminals are located on the back of the RFIB Pin 1 FAN 1 LOW The ground return for the motor in Fan 1 Pin 2 FAN HI Connected to...

Страница 49: ... WO 126 REFL PWR This capacitive feedthrough pin is the reflected power sense line It is a voltage indicative of the power reflected due to a mismatch The voltage pro duced will typically be such that less than a 3 1 VSWR will not trigger alarms and when VSWR 6 1 the con troller will reduce power The voltage level will be between 0V 5V and drive a 10k ohm load This line goes through the multiplexe...

Страница 50: ...troller which has the dual role of loading the synthesizer chip and adjusting the power control D A lines for proper output power The data has TTL levels Up to four synthesizer chips and a shift register could be connected to this pin 6 4 6 RECEIVER CONNECTOR J103 The connector from the Receiver J201 to the RF Interface board J103 links the Receiver to the TPI card in the Controller Backplane Pin ...

Страница 51: ... Receiver board Pin 16 HS CS RX Not used at this time Pin 17 GROUND A pin that carries ground current between the RFIB and the Receiver board Pin 18 RF CLK The clock controls the Receiver synthesizers when loading The input source in the Controller is TTL with the speed determined by the synthesizer chip There could be as many as four synthesizers and a shift register Pin 19 HS LK RX Not used at t...

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