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USER MANUAL RELEASED

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1. 8 2 9 REMOVAL AND REINSTALLATION 9 1 9 1 Access to Internal Assemblies nnne 9 1 gi JPS ABo ard xe eame tube RR Le ii 9 2 9 3 IE Audio Board sui ku DING NAG BA te Aha BERS 9 2 Ged ME OSB Oar gj erre 9 2 9 5 RE Board Assembly ss 9 3 10 FIGURES 10 1 Page i Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 0014 8 RL 903 Receiver Issue 1 Rev C 12 10 96 List of Figures List of Figures Figure 3 1 Receiver Isometric Front View 3 3 Figure 3 2 Receiver Rear 3 4 Figure 3 3 Top View of Internal Assemblies 3 5 Figure 3 4 Receiver Functional Diagram GAAN ANAN ian 3 6 Figure 5 1 Front Panel Controls and Indicators 5 3 Figure 6 1 Synthesizer Functional Diagram 6 3 Figure 7 1 Synthesizer Controls and Indicators eee 7 4 Figure 7 2 Pest 7 9 Figure 7 3 Programming Synthesizer Frequency 7 12 Figure 7 4 RF Assembly Adjustments 7 16 Figure 7 5 IF Board Controls and Indicators sese esse ereer 7 19 Figure 7 6 PS A Board Controls and Indicators e 7 2
2. 2 1 DESCRIPTION 3 1 31 Introduction 3 1 3 2 Physical Description 3 1 3 3 Simplified Block Diagram Description 3 INSTALLATION AND SETUP 4 1 4 1 Pr cautions and Hazards eene 4 4 2 Test Equipment and Tools Required 4 1 3 Component and Adjustment Locations 4 4 4 Installation 4 2 4 4 1 Inspection 4 2 4 4 2 Power Requirement sse ee enne 4 2 4 4 3 Input output Connections 4 2 4 4 4 Internal Test Points Switches and Jumpers 4 2 4 5 Ultimate Disposition 4 2 OPERATION 5 1 5 1 Front Panel Controls and indicators eee 5 1 5 2 Operating Instructions 5 1 THEORY OF OPERA TION 6 1 6 1 PS 2 Board 6 1 6 1 1 Power Supply 6 1 6 1 2 Audio Amplifier 6 1 6 2 RF Amplifier First Mixer 6 1 Copyright 1996 Glenayre 903 Receiver Table of Contents Page RL 903 Receiver Glenayre Document Number 9110 00148 Table of Contents Issue 1 Rev C 12 10 96 6 3 Synthesizer and VCO Block Diagram Description 6 1 6 3 1 VCO 6 2 6 3 2 PLL Synthesizer eee enne 6 2 6 3 3 Reference Oscillators ss ss 6 2 6 3 4 Programming Logic
3. Power Checks 8 1 DOC 1 3 documents applicable 1 1 Print Date 12 05 96 RL 903 Receiver F fault 6 2 reporting 6 5 fax number 1 2 FCC 1 3 Figure 4 2 first mixer 6 1 fm detection 6 4 frequency range 2 1 front end assembly 9 3 Front End Assembly Removal 9 3 front panel controls and indicators 5 1 5 2 view 3 3 5 1 5 3 G Glenayre 1 2 1 0 board assembly 10 1 schematic 10 1 I O connections 4 3 IF amplifier 6 1 6 4 tuning 7 2 tuning procedure 7 5 IF amplifier sensitivity check 8 2 troubleshooting 8 2 IF board audio level adjustment procedure 7 9 controls and indicators 7 17 7 19 removal and reinstallation 9 2 IF board 4 2 VCO board 4 2 Industry Canada 1 3 input power 6 1 inspection 4 2 interface board 3 1 internal connections 4 4 Copyright O 1996 Glenayre Page index 1 RL 903 Receiver J JR1 7 1 JR3 6 2 7 1 JR4 7 2 K keying front panel KEY switch Si 6 5 KEY LINE LED 6 5 L Line Audio Level Adjustment Procedure 7 9 line driver adjustment 7 9 audio selection 6 4 enabling 3 2 function 3 1 operation 6 1 6 5 option 1 1 specifications 2 1 link repeater 3 1 link repeater receiver 1 1 local oscillator setup 7 1 M manual part numbers 1 1 models receiver 1 1 N narrowband 1 1 noise squelch adjustment 7 6 NORMAL Squelch Adjustment Procedure 7 6 notch 3 2 notch tone 3 2 P power supply 7 1 Power Supply Adjustment 7 1 PS A board checkout 8 1 controls 7 20 re
4. t dla 5 e su 1 off 0 ON Print Date 12 05 96 Copyright 1996 Glenayre Page 7 11 RL 903 Receiver Glenayre Document Number 9110 00148 MAINTENANCE Issue 1 Rev C 12 10 96 Note Some switch manufacturers may construct and label their switches differently If the correct frequency is not programmed try setting all switch segments to the opposite setting to reset JR4 partial view of synthesizer VCO board N Figure 7 3 Programming Synthesizer Frequency Page 7 12 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 MAINTENANCE Table 7 5 Synthesizer Switch Settings for Common Frequencies Hir Si 32 L PE S1 32 freguency Si 82 z SE 8 oss 8 MHz fesse Ba naaa 8 MHz lues Mina 8 928 0125 01000111 11100100 931 2125 01000111 10010100 932 00625 10000110 01010100 928 0375 01100111 11100100 9312375 01100111 10010100 932 01875 11000110 01010100 928 0625 01010111 11100100 931 2625 01010111 10010100 932 03125 10100110 01010100 928 0875 01110111 11100100 9312875 01110111 10010100 932 04375 11100110 01010100 928 1125 01001111 11100100 9313125 01001111 10010100 932 05625 10010110 01010100 928 1375 01101111 11100100 9313375 01101111 10010100 932 06875 110
5. ss 6 2 6 4 IF Board anni is X 6 4 6 4 1 IF Amplification and FM Detection 6 4 6 2 Audio Processing 6 4 6 1 3 Squelch and RSSI 6 4 6 4 4 Fault Reporting 6 5 6 4 5 Keying 6 5 6 5 Line Driver Circuit optional IF board 6 5 7 MAINTENANCE 7 1 El Test Conditions sise SR cn nn LER 7 1 1 2 Power Supply PS A board unless noted errer 7 1 7 3 Local Oscillator Setup synthesizer board unless 7 1 7 4 VCO Tuning synthesizer board unless noted 7 2 7 5 RF and IF Tuning IF board unless noted 7 2 7 6 Sguelch and RSSI Adjustment IF board unless noted 1 6 7 7 Audio Level Adjustment IF board unless 7 9 8 CHECKOUT AND TROUBLESHOOTING 8 1 8 1 Power Supply PS A board unless noted esses 8 1 8 2 Audio IF board unless noted 8 1 8 3 Synthesizer Frequency and Reference Oscillator 8 2 8 4 RE IF and Squelch IF board unless noted
6. 185 P2 y lt AC COUPLED AUDIO P2 SQUELCH P2 EE D p2 N3 Leo D po UN T EC UN TB2 A P2 D 4 lt OUTPUT TO DELAY P2 gt _ _ _ _K RECEIVER FAULT PROCESSOR TB2 TB3 P2 T L FROM DELAY P2 y zase Spice PROCESSOR P2 gt pr SECUN s 10 7 7 35 P2 gt LINE OUTPUT P2 en E INTERLOCK TZ TB3 P2 gt UNE OUTPUT P2 33 8 INTERLOCK Figure 10 1 Interface Board 265 0305 002 A ssembly and Schematic Print Date 12 05 96 Copyright 1996 Glenayre Page 10 1 RL 903 Receiver Glenayre Document Number 9110 00148 FIGURES Issue 1 Rev C 12 10 96 NOTE SEE BAND TABLE FOR NARROWBAND VALUES 4 Hr W FROM TONE P6 ge Tes KEMIDNE X Et VOTING TONE lt a NOTE ONLY ONE FILTER IS TO BE USED AT TIME WIDE DR NARROW BAND VELA MOIS OEY pa c KEYTONE X al RSS m m 9 i m Figure 10 2 IF Audio Board Schematic Page 10 2 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 JR JRIO R67 BKET Print Date 12 05 96 ROB 20K a VBIAS 10K 51 1 SQUELCHX JR3 JR4 Figure 10 2 IF Audio Board Schematic continued Copyright 1996 Glenayre LOCK_DETECT Q2 Res R125 R 24 51 1 RL 903
7. note Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 MAINTENANCE 7 7 Audio Level Adjustment IF board unless noted Perform this procedure only after RF and squelch adjustment procedures have been performed Refer to Figure 7 5 Board Controls and Indicators IF Board Audio Level Adjustment Procedure 1 Set SQUELCH switch to TEST to allow audio path to be turned on Place audio volt meter at J1 2 TB2 2 and ground 2 Apply standard test signal Set modulation to 3 0 kHz for 5 kHz systems or to 1 5 kHz for 2 5 kHz systems 3 Adjust R51 so that ac coupled voltmeter reads 1 Vp p Continue with the line audio procedure if necessary Line Audio Level Adjustment Procedure This circuitry is optional and is used in LD models Perform this procedure after the preceding procedure is completed 2 Adjust front panel LINE OUT R57 so that front panel LINE OK HI D15 is lit green with modulation from standard test signal Note that LED flickers to green and red during normal operation Line output level is approximately 0 dBm Red occurs at approximately 2 dBm Set generator to RF input POWER SUPPLY frequency 12 28 Vdc3 A Use TB2 2 for audio output Attach power supply to TB1 Use spare I O board to make signal connectors POS
8. proj be 27 78 2 DELAY IN EC DELAY OUT ET 5 T82 3 SQUELCH 183 7 T83 2 ES J DE LINE 8 783 8 2 10 INTERFACE BOARD TB2 1 TB2 7 TB2 8 OUT RSSI ss 12 TB3 5 13 TB3 3 amp 6 HC UNE FROM SYNTH 14 TB3 4 T TM H M 19 4 18258 PN DC COUPLED AUDIO AC COUPLED AUDIO TX AUDIO TX KEY LO KEY PROCESSED AUDIO TO RX AUDIO TO EXTERNAL PROCESSOR GROUND INTERLOCK SQUELCH HISUNSQUELCHED INTERLOCK LINE OUT GROUND RSS GROUND FAULT LO 0K LINE OUT Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 INSTALLATION AND SETUP 4 4 1 4 2 4 3 INSTALLATION AND SETUP This manual contains setup information for the receiver For a broader view of setup refer to the system manual Precautions and Hazards Caution PC boards within this assembly use static sensitive components Follow IC handling precautions Test Eguipment and Tools Reguired Most internal adjustment can be performed with the receiver chassis pulled forward and with the lid removed The receiver s RF and 1 0 sections should not need realignment unless poor operation is indicated or if the receive frequency has been changed by more than one MHz Table 4 1 Test Equipment Required Shows required test equipment for setup Common hand tools are also required Table 4 1 Test Equipment Required
9. 12 10 96 REMOVAL AND REINSTALLATI 4 Use nutdriver to remove nuts holding pc board to shock mounting pegs Hold bott of mounting screws with screwdriver from bottom if necessary 5 Lift board up and toward rear 6 Record positions of jumpers and programming switch if new board is to be install 7 Replace shield and fasten with hardware as appropriate Note Be certain that no loose hardware such as springs is lost while the VCO is out of its mounting 95 RF Board Assembly RF Board Assembly Removal 1 Mark and remove power and signal connectors Note polarity of connectors 2 Remove rear panel or BNC feedthrough to allow pc board clearance 3 Remove screws which hold pc board to chassis 4 Remove pc board by carefully lifting up Note Be certain that the new RF board is tuned to the correct range if you are replacing the front end assembly Print Date 12 05 96 Copyright O 1996 Glenayre Page 9 3 RL 903 Receiver Glenayre Document Number 9110 00148 REMOVAL AND REINSTALLATION Issue 1 Rev C 12 10 96 Page 9 4 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 RL 903 Receiver FIGURES 10 FIGURES 1 TB2 TB3 ke F 2020000080 L TO FE 60000 p2 122 O OOO MA V0302 A 94 05 18 1 182 3 P2 gt gt Pc COUPLED AUDIO P2 TRANSMITTER KEYLINE 2 2 82 8 2
10. J1 1 AUDIO DC DC AUDIO TB2 1 U6 1 output through 1000 ohms J1 2 AUDIO AC AC AUDIO TB2 2 U5 8 output tx audio J1 6 ground GROUND TB2 3 chassis ground J1 5 DELAY OUT TO EXT DELAY TB2 4 connects to input of external delay J1 4 DELAY IN FROM EXT DELAY TB2 5 connects to output of external delay J1 11 ground GROUND TB2 6 chassis ground J1 10 LINE LINE OUT TB2 7 optional 600 ohm balanced output J1 15 LINE LINE OUT TB2 8 optional 600 ohm balanced output J1 3 TXKEY KEY TB3 1 optional keyline output LO key J1 8 SQUELCH SQUELCH TB3 2 HI unsquelched J1 13 ground GROUND TB3 3 chassis ground J1 14 FAULT FAULT IND TB3 4 fault out of lock output LO okay J1 12 RSSI RSSIIND TB3 5 see text GROUND TB 3 6 chassis ground J1 7 interlock INTERLOCK TB3 7 internally jumpered together J1 9 interlock INTERLOCK TB3 8 internally jumpered together RF Assembly JI RF input RFIN RF board J1 is attached to rear panel female BNC receptacle via a short cable synthesizer assembly P3 external refer EXT REF P3 on synthesizer is attached to rear panel BNC ence input receptacle by short cable ground stud Attach to common cabinet ground Print Date 12 05 96 Copyright O 1996 Glenayre Page 4 3 RL 903 Receiver INSTALLATION AND SETUP Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Table 4 3 Internal Connections among Assemblies
11. Print Date 12 05 96 RL 903 Receiver MAINTENANCE The following procedure checks the approximate RSSI indication for various RF input levels RSSI Level Observation Procedure 1 Set front panel SQUELCH switch to TEST nA D Connect voltmeter to J1 12 TB3 5 Set input level to 30 dBm RSSI level should at least 4 9 Vdc Set RF level to 76 dBm RSSI level should be at least 3 0 Vdc Turn RF input level off RSSI level should be less than 0 7 Vde Fill out Table 7 2 RSSI Levels to chart the signal strength intensity with RSSI voltage Note The RSSI level is a good indicator of signal levels Periodically record the RSSI level while the receiver is receiving the desired signal Use Table 7 3 RSSI Levels when Receiving a Signal from Link Transmitter as an example The record will show unplanned variations in the quality of the signal path Table 7 2 RSSI Levels RF input dBm RSSI voltage Vdc RF input dBm RSSI voltage Vdc 120 84 117 81 114 78 111 75 108 72 105 69 102 66 99 63 96 60 93 57 90 54 87 51 Copyright 1996 Glenayre Page 7 7 RL 903 Receiver MAINTENANCE Page 7 8 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Table 7 3 RSSI Levels when Receiving a Signal from Link Transmitter receiver model receive frequency MHz serial number date RSSI level Vdc
12. Refer to Figure 3 4 Receiver Functional Diagram The line out audio input at front panel LINE OUT control R57 is amplified by op amp U8 1 and drives transformer T1 whose balanced output exits the chassis at rear panel J1 10 and 15 TB2 7 8 Comparators U8 7 and U8 8 control front panel HIGH and OK D15 Refer to Paragraph 7 7 to adjust level Copyright 1996 Glenayre Page 6 5 RL 903 Receiver Glenayre Document Number 9110 00148 THEORY OF OPERATION Issue 1 Rev C 12 10 96 Page 6 6 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 MAINTENANCE 7 MAINTENANCE This section explains the setup and use of the receiver 7 1 Test Conditions Refer to Figure 3 2 Receiver Rear View and Figure 7 2 Test Setup For all RF and audio tests when input power is required supply a 10 30 Vdc power supply capable of supplying three amperes to rear mounted TB 1 as follows 10 6 30V TB 1 2 on right to GND TB1 1 left to standard test signal consists of an RF carrier supplied to RF INPUT J1 at a level of 47 dBm modulated by a 1000 Hz tone at 1 3 kHz 1 5 kHz for narrow band deviation Figure 7 2 illustrates how test equipment is to be attached 7 2 Power Supply PS A board unless noted Perform the following procedure to check the power supply operation Note that the power supply output is fixed Power Supply Check 1 Check that inp
13. connection 1 label 1 label 2 connection 2 note IF board IF board VCO assembly VCO assembly P3 1 2 12V 12V P1 1 2 power to VCO P3 3 thru 7 ground GROUND P1 3 ground P3 8 LOCK DETECT OUT OF LOCK P1 8 fault input to IF board RF assembly 13 P2 cable 1 0 injection to first mixer IF board RF assembly P3 1 2 42V 12V P1 1 power to RF board P3 3 thru 7 ground GROUND P1 2 P5 45 MHz input IF OUTPUT 12 IF connection from RF assembly IF board tone board optional JS front J4 rear P6 1 from_tone audio_out J2 1 tone audio output P6 2 ground ground J2 2 ground P6 3 keytone keytone J2 3 keytone detected LO P6 4 ground ground J2 4 ground P6 5 voting tone voting tone J2 5 n u P6 6 ground n c J2 6 ground P6 7 8 n c n c J2 7 8 P7 1 2 12v 12 J1 1 2 12 Vdc P7 3 ground ground J1 3 ground P7 4 to tone audio in J 1 4 tone audio input P7 5 ground ground J1 5 P7 6 7 8 n c n c J1 6 7 8 IF board PS A board P8 1 2 12v 12v to receiver P2 1 2 12 Vdc source for RF board P8 3 4 ground ground P2 3 4 ground P8 5 speaker audio speaker audio P2 5 connects to speaker amplifier P8 7 n c disable P2 7 Page 4 4 Copyright 01996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 RL 903 Receiver INSTALLATION AND SETUP Table 4 3 Internal Connections among Assemblies continued connection 1 label 1 label 2 con
14. item characteristic service monitor to I GHz IFR model 12005 or equivalent frequency counter to I GHz digital voltmeter Beckman model 330 or equivalent audio distortion analyzer capable of measuring audio distortion to 3000 Hz Sinadder or equivalent power supply 12 Vdc at 3 A optional spectrum analyzer capable of displaying up to I GHz optional RF millivoltmeter capable of reading 0 dBm at I GHz QPN 263 0305 002 receiver I O board for accessing I O signals slotted alignment tool Johanson 8777 Component and Adjustment Locations Figure 3 3 Top View of Internal Assemblies shows the locations of pc boards Print Date 12 05 96 Copyright O 1996 Glenayre Page 4 1 RL 903 Receiver Glenayre Document Number 9110 00148 INSTALLATION AND SETUP Issue 1 Rev C 12 10 96 4 4 Installation 4 4 4 Inspection Refer to the system manual for inspection information 4 4 2 Power Requirement The receiver when used as a component of a paging site draws its power from system wiring 4 4 3 Input Output Connections Figure 3 2 Receiver Rear View shows the locations of rear mounted I O connectors and Table 4 2 I O Connections lists I o connectors and describes their functions Normally the receiver is delivered as part of an entire paging system and has already been installed in a rack with all connections already made except for connections to equipment that was not installed in the rack before sh
15. 10 6 30V NEG GND Figure 7 2 Test Setup Print Date 12 05 96 Copyright 1996 Glenayre Page 7 9 RL 903 Receiver MAINTENANCE Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 BASIC Listing for Programming Synthesizer Press Ctrl Scroll Lock to exit 11382721 160 90 CLS 100 REM program to calculate RL 903 receive frequency 110 PRINT This program helps calculate the Si and S2 switch settings 120 PRINT for the RL 903 synthesizer 130 PRINT Enter the receive frequency MHz 140 INPUT D 150 IF D gt 1100 OR D 870 THEN 130 160 H INT D 864 2 160 0 5 165 PRINT Frequency MHz is D exactly 170 PRINT Hex value is 175 HH HEXS H 180 PRINT HEXS H 185 GOSUB 500 190 PRINT Binary value is 200 FOR I 1 TO 4 210 PRINT HI I I 220 NEXT I 230 PRINT Si segments 1 4 HRS 4 240 PRINT Si segments 5 8 HRS 3 250 PRINT S2 segments 1 4 HRS 2 260 PRINT S2 segments 5 8 HRS 1 270 PRINT NOTE 0 ON 1 off 280 PRINT 290 GOTO 130 500 REM calculate hex and binary 510 HH 0000 HHS 520 HHS RIGHTS HHS 4 530 FOR I 1 TO 4 535 BS MIDS HH I 1 540 GOSUB 700 550 HIS I A HRS I RR 560 NEXT I 570 RETURN 700 REM look up binary values from hex 710 AS 720 IF B O0 THEN AST 00
16. Documents aas panmumber description 915 0103 000 tone control board for configurations which use a tone decoder inside the receiv er e g a link repeater receiver 9110 00781 GL C2000 transmitter controller v2 30 IBPHASE3 QT 1000 TXC transmitter controller are possible 9110 00082 GL C5012 transmitter controller ter Refer to Table 1 2 This table lists the sections in this manual and provides a brief descrip tion of the content of each section tone control board transmitter controller These are typical others Copyright 1996 Glenayre Page 1 1 RL 903 Receiver GENERAL Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Table 1 2 Manual Sections section contents 1 General contains scope and content of this entire manual and lists other applicable documents to supplement this manual 2 Specifications contains overall and selected equipment specifications and those not giv en in other equipment manuals 3 Description contains overall physical and functional equipment descriptions 4 Installation amp Setup contains relevant equipment installation information and setup procedures contains overall description of operator controls contains overall block diagram level theory of operation for equipment listed in Paragraph 1 1 as it functions as a unit 5 Operation 6 Theory of Operation 7 Maintenance 8 Checkout and Troubleshooting
17. IF tuning and filter matching L3 L7 L8 L5 quadrature coil C52 second 1 0 fine tune Print Date 12 05 96 Copyright 1996 Glenayre Page 7 17 RL 903 Receiver MAINTENANCE Page 7 18 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Table 7 7 IF Board Controls and Indicators continued reference designato r function D21 POWER indicates power supply on when lit green D11 KEY tx key green D14 SQUELCH indicates unsquelched when lit green D15 red green line output J1 8 9 at or above preset level green red line output above preset level see text optional R5 voting tone level not used R51 audio level to IF board R57 LINE OUT line audio level optional R80 NORMAL noise squelch R81 TIGHT carrier squelch Sl KEY DISable REMOTE switch S2 SQUELCH select JR3 JR4 3 line audio on ignores squelch logic 4 line audio controlled by squelch logic JR5 JR6 6 voting tone disabled movable jumper not required 5 voting tone enabled JR7 JR8 8 tone board bypassed or used in link transmitter con figuration 7 tone board audio path enabled paging transmitter configuration JR9 JR10 10 11 true audio phase JR11 JR12 9 12 inverted audio phase JRI3 JR14 14 delay processor bypassed 13 delay processor enabled JRI5 JR16 16 flat ac coupled audio fed to J1 2 TB2 2 15 deemphasized ac cou
18. Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 6 4 4 6 4 5 THEORY OF OPERATION Green front panel SQUELCH LED D14 lights whenever the receiver is unsquelched Front panel NORMAL SQUELCH control R80 adjusts the sensitivity of noise squelch Front panel TIGHT SQUELCH control R81 adjusts the sensitivity of carrier squelch Refer to Paragraph 7 7 for adjustment The RSSI signal from U2 goes to dc amplifier U6 1 and comparator U7 7 The RSSI voltage is available at rear panel J1 12 TB3 5 for external equipment Fault Reporting A condition which causes the receiver s PLL circuitry to go out of lock causes the lock detect signal at P3 8 to go LO The fault causes a HI at Q2 drain and rear panel J1 14 TB3 4 for reporting to external equipment During a fault D5 causes the receiver to be squelched Keying The receiver must use the optional tone board for keying Green front panel KEY LINE LED D11 lights whenever the keyline is active The front panel key switch works as follows e S I set to REMOTE A keytone LO from the tone board at P6 3 is passed via front panel KEY switch S1 to U7 and Q4 A LO to the paging or link transmitter is passed to rear panel txkey J1 3 TB3 1 The receiver must be unsquelched in order for the keyline to become active e SI set to DIS Keying is disabled e SI set to KEY The txkey output is active LO 6 5 Line Driver Circuit optional IF board Print Date 12 05 96
19. RFAmplifier First Mixer Figure 7 4 RF Assembly Adjustments shows a view of the assembly Refer to Figure 10 3 Front End Schematic The RF input is at rear mounted BNC connector J1 on the left of the back of the chassis as viewed from the rear The desired signal is passed by helical filters L2 L3 L4 L7 L8 and L9 and is amplified by Q1 while undesired signals are atten uated The RF output is matched by L10 to one input of mixer U1 The Lo signal from the synthesizer arrives at SMB receptacle J3 and is passed to the second input of mixer U1 The output of mixer Ul is a 45 MHz IF signal which exits the RF board at 12 Receptacle 14 is used with a network analyzer in the factory for tuning the front end 63 Synthesizer and VCO Block Diagram Description Print Date 12 05 96 Figure 7 1 Synthesizer Controls and Indicators shows a view of the pc board The synthe sizer tunes in 6 25 kHz steps to accommodate the channel spacing of 12 5 or 25 KHz Refer to Figure 6 1 Synthesizer Functional Diagram and Figure 10 4 VCO Board Schematic Copyright 1996 Glenayre Page 6 1 RL 903 Receiver Glenayre Document Number 9110 00148 THEORY OF OPERATION Issue 1 Rev C 12 10 96 6 3 1 VCO The VCO oscillates at the first 1 0 injection frequency The active element in the circuit is Q6 whose output is fed to buffer Q5 through a two dB pad for isolation The output of Q5 goes to the front end assembly for use as the local oscillator signal fo
20. Receiver FIGURES UN FAULT C80 T Tn o S lt HA Carrie r Pat RTE JRIS Ch C38 121 1004 511 MIDDAG 1 3 C819 R92 ii 100K CBA R120 R119 R118 Cn 4705 4705 4765 DE_EMPH 3 b SPEAKER AUDIO C31 SRBI du VORHER A O Page 10 3 RL 903 Receiver Glenayre Document Number 9110 00148 FIGURES Issue 1 Rev C 12 10 96 ct 1D UNE AUDIO 2 Da V 2N308 css 100n T ALL RESISTORS ARE IN CHWS R198 ALL CAPACITORS ARE IN uF x UNLESS OTHERWISE SPECIFIED 2 2 COMPONENTS ARE NORMALLY NOT INSTALLED 3 COMPONENTS MARKED WITH Xx ARE PART OF THE LINE DRIVER OPTION 959 THESE COMPONENTS ARE INSTALLED ON 805 NARROW WIDE BANDS SEE BAND TABLE FOR CORRECT VALUES INSTALLED IN BOARD FOR ASSEMBLY IN USE BAND TABLE REF DESIGNATOR RLOOS WIDEBAND RLDOS NARROWBAND RL453 WIDEBAND O m Fi VF45RB2 48E2F2 MF45R82 205004 F2 CFU45502 CFWAS5F CFU455E2 C85 15p n 159 H q cs 18p NOT INSTALLED 18p VEUS in nf a K q V LB NOT INSTALLED 1 3uH NOT INSTALLED C51 NOT INSTALLED 05 TO 155 NOT INSTALLED JUMPER TABLE C88 10p 2p2 10p FEATURE INSTALL REMOVE COMMENTS c19 189 NOT INSTALLED 18 AUDIO POLARTY Ja R12 RIO URI AUDIO PHASE POLARITY CONTROL C20 12p 100p 129 AUDIO POLARTY JRID JRM JRS JR 2 AUDIO PHASE POLARTY CONTROL RBB 10K 3KBS 10K T Jb RS uR7 vaja ROUTES AUDO TO OPTI
21. Table 7 7 IF Board Controls and Indicators ss 7 17 Table 7 8 PS A Board Controls eir ei ete cei redes 7 20 Print Date 12 05 96 Copyright 1996 Glenayre Page v RL 903 Receiver Glenayre Document Number 9110 00148 List of Tables Issue 1 Rev C 12 10 96 Page vi Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 1 GENERAL GENERAL MM naaa 11 Manual Scope This manual presents the RL 903 900 MHz range receiver It contains information concerning the overall operation of the front end IF board VCO and power supply The optional tone board is treated in a separate manual Models in the series include e RL 903R link repeater receiver which passes the signal to a link transmitter e RL 903XC receiver for use by an external control device The above models may be narrowband for 2 5 kHz deviation systems or wideband for 5 kHz deviation systems Any of these combinations may have the line driver LD option which provides a balanced output for telephone lines The LD option may also be a separate model 12 Applicable Documents 1 3 Manual Sections Print Date 12 05 96 Other manuals in addition to this manual may be required for complete paging site docu mentation Refer to Table 1 1 for a list of applicable documents their part numbers and a brief description of each Table 1 1 Applicable
22. US i IL lagi DC INPUT TP1 TP3 OO re 1 TO SPEAKER sw2lo s 5 JUMPER 2 V0318 A 94 05 26 VOLUME Figure 7 6 PS A Board Controls and Indicators Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 CHECKOUT AND TROUBLESHOOTING 8 CHECKOUT AND TROUBLESHOOTING Refer to the system manual to isolate a fault to a piece of equipment Use this section to isolate a fault to an assembly If the receiver does not function correctly perform the proce dures listed in this section to determine the problem Keeping records of performance of this receiver is helpful Use Table 2 1 Specifications to determine the expected sensitivity of the receiver Refer to Figure 3 3 Top View of Internal Assemblies to locate the assemblies 8 1 Power Supply PS A board unless noted Check power supply output and delivery to pc assemblies in this procedure Figure 7 6 PS A Board Controls and Indicators provides a view of the pc board Dc Power Checks 1 Check that input power 28 Vdc or within range of specifications is supplied to rear mounted TB 1 2 Turn on front panel power switch Front panel POWER LED IF board D21 should light Check that fuse is okay Check voltage at TP2 Voltage should be 14 5 to 15 5 Vdc Check voltage at TP1 Voltage should be 11 5 to 12 5 Vdc nn Refer to Figure 7 5 Check vo
23. contains information needed to checkout and troubleshoot overall equip ment performance 9 Removal and Reinstallation contains information needed to remove and reinstall the rack and equip ment contained in it 10 Figures contains related engineering drawings not found elsewhere contains an alphabetized index of significant items contains necessary maintenance procedures which keep site operating within specified parameters a x 1 4 About Glenayre Questions regarding the equipment or this manual should be directed to U S A CANADA Glenayre Customer Service RF Glenayre Customer Service RF One Quintron Way 1450 Kootenay Street Quincy Illinois 62305 3726 Phone 217 223 3211 Fax 217 223 3284 UNITED KINGDOM Glenayre Electronics UK Ltd Unit 3 Challenge House Sherwood Drive Milton Keynes HERTS MK3 6DP Phone 44 908 644 642 Fax 44 908 644 643 Page 1 2 Copyright 1996 Glenayre Vancouver B C V5K 4R1 Phone 604 293 1611 Fax 604 293 4301 SINGAPORE Glenayre Electronics PTE Block 5012 Ang Mo Kio Avenue 5 Industrial Park 2 Unit 05 03 04 Singapore 2056 Phone 65 4811828 Fax 65 4812838 Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 1 4 1 1 4 2 GENERAL Product Warranty Information Glenayre warrants to the original purchaser that Glenayre products are free from defects in material or workmanship
24. provision for standard test setup See Figure 7 2 Test Setup Copyright 1996 Glenayre Page 9 1 RL 903 Receiver REMOVAL AND REINSTALLATION 9 2 PS A Board 9 3 IF Audio Board 9 4 VCO Board Page 9 2 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Removing Receiver Rear Panel Continue disassembly if removal of major internal assemblies is required Removal of rear panel is required for some assemblies Disconnect BNC cable plug from front end RF assembly and VCO synthesizer re ceptacles Remove 4 screws which hold receiver back and remove rear panel PS A Board Removal Remove rear panel Mark and remove connectors for electrical connections Observe polarity of P2 Record arrangement of hardware and remove hardware holding IC heat sinks to side of chassis sem head chassis Remove screws holding pc board to chassis and lift up and toward rear IF Board Removal Remove rear panel Mark and remove connectors for electrical connections Observe polarity of connec tors Remove tone board if required Remove screws holding pc board to chassis and lift board up and toward rear VCO Board Removal Mark and remove power and signal connectors Note polarity of connectors Remove rear panel or BNC feedthrough to allow pc board clearance Use nutdriver to remove shield Copyright 01996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Rece Issue 1 Rev C
25. the audio level at audio dc J1 1 TB2 1 and audio ac J1 2 TB2 2 Refer to Paragraph 7 7 for adjustment Audio phase polarity is controlled by JR9 through JR12 Refer to Table 7 7 Buffers U6 8 and U6 7 provide additional filtering Audio may be routed to an external delay device and then returned depending on the settings of jumpers Audio may also be routed to the optional tone board also depending on the settings of jumpers Refer to Table 7 7 Audio output to the transmitter is present at rear panel J1 2 TB2 2 The optional line driver circuit may be driven by either squelched or unsquelched audio depending on the setting of jumpers Refer to Table 7 7 and Paragraph 6 5 6 4 3 Squelch and RSSI In order to provide reliable squelch in harsh RF environments there are two types of squelch carrier squelch TIGHT squelch and NORMAL noise squelch Carrier squelch is triggered by the signal strength and noise squelch the type of squelch common to most FM receivers is triggered by the relative amount of high audio frequency intensity in the received signal Front panel SQUELCH switch S2 selects the type of squelch used e When S2 is set to TIGHT squelch is under the control of carrier squelch When S2 is set to TEST squelch is disabled enabling the audio path e When S2 is set to NORMAL only noise squelch is used to determine squelch status Page 6 4 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document
26. the two most significant bits of the programmable divider for channel selector are also clocked in after the enable pulse The data which is latched into registers U4 and US from user programmable DIP switches Si and S2 is essentially shifted through GAL U3 to synthesizer U10 to provide the final sixteen bits for the programmable divider The enable line is then reactivated to latch in the data When the synthesizer is out of lock red FAULT LED D2 is lit and U9 1 goes LO to provide a lockout status report for the board The status signal appears at P1 8 and to IF board P3 8 where it becomes the LOCK_DETECT signal On the IF board the LOCK_DETECT signal is inverted and appears at rear IF board connector J1 14 TB3 4 as the FAULT output HI out of lock Page 6 2 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 EXT 10 MHz REF 1 2 3 P3 H JR2 REF 51 SELECTION U11 IRIS 128 MH 0 REF TP1 9 CONTROL VOLTAGE VCO LOOP E FILTER U9 U13 CONTROL Q2 Q4 VOLTAGE BUFFER ACTIVE BIAS CONTROL VOLTAGE C46 COARSE TUNING R56 VO148_E_95 10 13 COUPLER DELAY LINE ML2 MLS L JR3 U1 U6 j RL 903 Receiver THEORY OF OPERATION St DIP DIP 152 FREQUENCY SWITCH SWITCH SELECT SWITCHES 8 B PROGRAMMING LOGIC NOTE JRS INSTALLED WHEN 10MHz REFERENCE IS USED U7 US L SYNTHESIZER LOCK f om DETECT UB P
27. transmitter for additional discussion Refer to the tone control manual see Table 1 1 for part number for a discus sion of the operation of the tone board Some systems require more extensive control than that offered by tone keying In such cases an external device uses the receiver audio and squelch status to control the associated transmitter Refer to the control device s manual for additional discussion An external 600 ohm balanced output may be used for sending remotely monitored audio over telephone lines This feature may be used at the same time as the previously mentioned features Additional components may need to be installed on the RF board in order for this feature to be enabled The received signal strength indicator RSSI is a dc voltage which gives a relative indica tion of the signal strength There are two types of squelch which may be used noise squelch NORMAL for normal reception and carrier squelch TIGHT for reception in areas of high RF density The power supply uses switching techniques to provide a stable output voltage despite wide variations in the input The board also provides the audio amplifier for the chassis mounted speaker Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 DESCRIPTION Figure 3 1 Receiver Isometric Front View Print Date 12 05 96 Copyright 1996 Glenayre Page 3 3 RL 903 Receiver Gle
28. 0 941 45625 10010010 00001100 9562875 01110001 10011100 941 04375 11100000 00001100 941 46875 11010010 00001100 9563125 01001001 10011100 941 05625 10010000 00001100 941 48125 10110010 00001100 956 3375 01101001 10011100 941 06875 11010000 00001100 941 49375 11110010 00001100 9563625 01011001 10011100 941 08125 10110000 00001100 956 3875 01111001 10011100 941 09375 11110000 00001100 952 0125 01000111 01101100 9564125 01000101 10011100 941 10625 10001000 00001100 952 0375 01100111 01101100 9564375 01100101 10011100 941 11875 11001000 00001100 952 0625 01010111 01101100 941 13125 10101000 00001100 952 0875 01110111 01101100 9598625 01010011 11011100 941 14375 11100000 00001100 952 1125 01001111 01101100 959 8875 01110011 11011100 941 15625 10011000 00001100 952 1375 01101111 01101100 959 9125 01001011 11011100 Page 7 14 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Table 7 5 Synthesizer Switch Settings for Common Frequencies continued RL 903 Receiver MAINTENANCE frequency S1 S2 frequency 1 2 frequency SI 82 MHz 1 FM 8 MHz f e Fre 8 MHz eer lus 8 941 16875 11011000 00001100 9521625 01011111 01101100 941 18125 10111000 00001100 9524875 01111111 01101100 941 1937
29. 0 Figure 10 1 Interface Board 265 0305 002 Assembly and Schematic 10 1 Figure 10 2 IF Audio Board Schematic essere 10 2 Figure 1023 Front End Schematic tto bold 10 5 Figure 10 4 VCO Board Schematic sse 10 6 Figure 10 5 PS A Board Schematic nana 10 7 Print Date 12 05 96 Copyright 1996 Glenayre Page iii RL 903 Receiver Glenayre Document Number 9110 00148 List of Figures Issue 1 Rev C 12 10 96 Page iv Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 List of Tables List of Tables Table 1 1 Applicable 1 1 Table 1 2 Manual T nete NANANA 1 2 Table 2 1 Specifications 2 1 Table 4 1 Test Equipment Required ATA ANG Nadala Nanay 4 1 Table4 2 TO Connections cete te e e cte Pep re p nd 4 3 Table 4 3 Internal Connections among Assemblies eee 4 4 Table5 1 Front Panel Controls and Indicators eee 52 Table 7 1 VCO Controls and Indicators enne 7 3 Table 7 2 RSSILEVEIS tm e dde tede dt 7 7 Table 7 3 RSSI Levels when Receiving a Signal from Link Transmitter ee 7 8 Table 7 4 Programming Synthesizer Frequency enem 7 11 Table 7 5 Synthesizer Switch Settings for Common Frequencies 7 13 Table 7 6 Board Controls sn 7 16
30. 00 0000 730 IF BS 1 THEN AS 0001 RRS 1000 740 IF BS 2 THEN AS 0010 RRS 0100 750 IF B 3 THEN AS 0011 RRS 1100 760 IF BS 4 THEN AS 0100 RR 0010 770 IF B 5 THEN AST 0101 RRST 1010 780 IF B 6 THEN AS 0110 RRS 0110 790 IF B 7 THEN A 0111 RR 1110 800 IF BS 8 THEN AS 1000 RRS 0001 810 IF B 9 THEN AS 1001 RRS 1001 820 IF B A THEN A 1010 RR 0101 830 IF B T B THEN AS 1011 RR 1101 840 IF BS C THEN A 1100 RR 0011 850 IF B D THEN A 1101 RR 1011 860 IF B E THEN AS 1110 RR 0111 870 IF B 7 F THEN AS 1111 RRS 1111 880 IF AS THEN PRINT 000000ps B BS STOP 890 RETURN Page 7 10 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 MAINTENANCE RL 903 Synthesizer Programming Enter and run the BASIC listing using BASIC or GWBASIC Alternatively use this formula hex number hex int fc 864 2 160 0 5 where fc operating frequency in MHz int integer function and hex hexadecimal conversion function Convert the hex number to binary using the following chart Note that 0 ON blank and off filled in Table 7 4 Programming Synthesizer Frequency 4or8 3or7 20r6 lor5 SlorS2switch segment setting of above switch seg ment 8 4 2 l hexvalue decimal value o w
31. 10110 01010100 928 1625 01011111 11100100 93136025 01011111 10010100 932 08125 10110110 01010100 928 1875 01111111 11100100 93138675 01111111 10010100 932 09375 11110110 01010100 928 2125 01000000 00010100 19314125 01000000 01010100 932 10625 10001110 01010100 928 2375 01100000 00010100 19314375 01100000 01010100 932 11875 11001110 01010100 928 2625 01010000 00010100 9314625 01010000 01010100 932 13125 10101110 01010100 928 2875 01110000 00010100 9314875 01110000 01010100 932 14375 11101110 01010100 9283125 01001000 00010100 9321 5125 01001000 01010100 932 15625 10011110 01010100 9283375 01001000 00010100 931 5375 01101000 01010100 932 16875 11011110 01010100 928 8625 01010110 00010100 19315625 01011000 01010100 9324148125 10111110 01010100 928 8875 01110110 00010100 931 5875 01111000 01010100 9324149375 11111110 01010100 928 9125 01001110 00010100 19316125 01000100 01010100 93220625 10000001 01010100 928 9375 01101110 00010100 931 6375 01100100 01010100 932 21875 11000001 01010100 928 9625 01011110 00010100 931 6625 01010100 01010100 932 23125 10100001 01010100 928 9875 01111110 00010100 931 6875 01110100 01010100 932 24375 11100001 01010100 931 7125 01001100 01010100 932 25625 10010001 01010100 931 0125 01000011 10010100 19317375 01101100 01010100 9322675 11010001 01010100 931 0375 01100010 10010100 19317625 01011100 01010100 932 28125 10110001 01010100 931 0625 01010011 10010100 9318
32. 125 01000010 01010100 932 29375 11110001 01010100 931 0875 01110011 10010100 9318375 01100010 01010100 932 30625 10001001 01010100 931 1125 01001011 10010100 931 865 01010010 01010100 932 31875 11001001 01010100 931 1375 01101011 10010100 931 8875 01110010 01010100 932 33125 10101001 01010100 931 1625 01011011 10010100 931 9125 01001010 01010100 932 34375 11101001 01010100 931 1875 01111011 10010100 9319375 01101010 01010100 932 35625 10011001 01010100 931 9625 01011010 10010100 932 37875 10111001 01010100 931 9875 01111010 10010100 932 38125 10111001 01010100 Print Date 12 05 96 Copyright 1996 Glenayre Page 7 13 RL 903 Receiver Glenayre Document Number 9110 00148 MAINTENANCE Issue 1 Rev C 12 10 96 Table 7 5 Synthesizer Switch Settings for Common Frequencies continued frequency S1 S2 frequency SI 2 frequency S1 52 MHz lac B Ms 8 MHz anis Be aao 8 MHz Los BC Ms 8 932 39375 11111001 01010100 932 40625 10000101 01010100 932 41875 11000101 01010100 932 43125 10100101 01010100 932 44375 11100101 01010100 932 45625 10010101 01010100 932 46875 11010101 01010100 932 48125 10110101 01010100 932 49375 11110101 01010100 941 00625 10000000 00001100 941 38125 10111100 00001100 941 01875 11000000 00001100 941 39375 11111100 00001100 956 265 01010001 10011100 941 03125 10100000 0000110
33. 4 turn Adjust second 1 0 at C52 for minimum distortion If using internal reference oscilla tor adjust trim cap on U6 for minimum distortion Do not detune more than 1 4 turn Restore jumpers and controls to normal positions 7 6 Sguelch and RSSI Adjustment IF board unless noted The following procedure sets TIGHT squelch for normal operation TIGHT Squelch Adjustment Procedure Set signal generator level for the desired signal quality typically 30 dB SINAD ap proximately 100 dBm Set front panel SQUELCH switch to TIGHT to enable carrier squelch Set front panel TIGHT squelch control so that signal is barely squelched If signal cannot be squelched leave control completely cw This is highly unlikely Front panel SQUELCH LED should go on and off depending on squelch status The following procedure sets NORMAL squelch Perform the procedure after completing the TIGHT squelch procedure NORMAL Squelch Adjustment Procedure 1 Page 7 6 Set signal generator level for desired signal quality typically 12 dB SINAD approxi mately 116 dBm Set front panel SQUELCH switch to NORMAL to enable noise squelch Adjust front panel NORMAL SQUELCH control to barely squelch receiver Verify level UNSQUELCH LED4 should go on and off depending on squelch status Set front panel SQUELCH switch to TIGHT Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96
34. 5 11111000 00001100 9522125 01000000 11101100 941 20625 10000100 00001100 952 2375 01000000 11101100 941 21875 11000100 00001100 19522625 01010000 11101100 941 23125 10100100 00001100 9522875 01110000 11101100 941 24375 11100100 00001100 952 3125 01001000 11101100 941 25625 10010100 00001100 9523375 01101000 11101100 941 26875 11010100 00001100 941 28125 10110100 00001100 941 29375 11110100 00001100 94130625 10001100 00001100 941 31875 11001100 00001100 94133125 10101100 00001100 941 34375 11101100 00001100 94135625 10011100 00001100 94137875 10111100 00001100 Print Date 12 05 96 Copyright 1996 Glenayre Page 7 15 RL 903 Receiver MAINTENANCE Glenayre Document Number 9110 00148 Table 7 6 RF Board Controls reference designator function L2 L3 L4 resonators on helical filter 1 L7 L8 L9 resonators on helical filter 2 CAUTION See text before attempting to adjust JS LO INPUT FROM VCO ir OUTPUT TO IF ASSY P1 12V INPUT FROM Ir ASSY Issue 1 Rev C 12 10 96 HOLD TUNING SCREW TIGHT WHILE TIGHTENINC Figure 7 4 RF Assembly Adjustments Page 7 16 Copyright 1996 Glenayre IS INPUT J1 Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 MAINTENANCE Table 7 7 IF Board Controls and Indicators reference designato r function CS1 LI
35. GH PASS NOISE FILTER 12 Fe APPROX 280Hz TO RECENER 3 SPEAKER AUDIO DISABLE DE EMPHASIS NOTES UNLESS OTHERWISE SPECIFIED 1 RESISTANCE VALUES ARE IN OHMS VALUES ARE IN MICROFARADS 2 REFERENCE DESIGNATION WITH ARE ANAL IM NAT sai EN Print Date 12 05 96 C23 202 3w To Taw R4 10K0 9 5 1 430 c2 L 5 100n L C5 22000 Bw DE EMPHASIS amp GAIN CONTROL Fc APPROX 220Hz Figure 10 5 PS A Board Schematic Copyright 1996 Glenayre RL 903 Receiver FIGURES 15 1V 12V REG C14 C13 1004 100n JSV 15 1V sw2 C15 c18 WT m 2 es SPEAKER 3 FRONT PANEL 25V x ns C 100n V R13 TRO D 3303 19 5 9 V0741 A 96 01 08 Page 10 7 RL 903 Receiver Glenayre Document Number 9110 00148 FIGURES Issue 1 Rev C 12 10 96 Page 10 8 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 A assemblies main 3 1 audio checks 8 1 external processing 6 4 filtering 6 4 level adjustment 7 9 level R51 6 4 phase polarity 6 4 B BASIC listing 7 10 block diagrm 3 1 C carrier squelch adjustment 7 6 ceramic filter 6 4 channel spacing 3 1 chassis dimensions 2 1 removing from equipment rack 9 1 weight 2 1 control tone 3 2 controls IF board 4 2 PS A board 4 2 RF board 4 2 VCO 4 2 crystal filter 6 4 D
36. LL VCO SAMPLE SYNTHESIZER BUFFER R57 EN P1 4 Figure 6 1 Synthesizer Functional Diagram Print Date 12 05 96 Copyright 1996 Glenayre Rr OUT TO FRONT END EE CE MC2 dx COUPLER MC2 ML6 ML7 C40 41 C48 51 Page 6 3 RL 903 Receiver Glenayre Document Number 9110 00148 THEORY OF OPERATION Issue 1 Rev C 12 10 96 6 4 IF Board Figure 7 5 IF Board Controls and Indicators shows a view of the pc board Table 7 5 IF Board Controls and Indicators lists the signal flow options which can be altered by changing the position of internal jumpers Refer to Figure 10 2 IF Audio Board Schematic 6 41 IF Amplification and FM Detection The 45 7 IF signal from the front end assembly is arrives at P5 Crystal filter F3 shapes the bandpass to accept the appropriate FM modulation nominally 5 kHz or 2 5 kHz and to provide some adjacent channel selectivity First IF amplifier buffers the signal between F3 and Fl Second IF amplifier Q6 buffers the signal between F1 and U2 which provides mixing IF amplification limiting and FM detection Ceramic filter F2 between the IF amplifier and limiter sections of U2 provides additional adjacent channel selectivity The FM detector section of U2 use 455 kHz quadrature coil LS to produce audio at U2 9 and a received signal strength indicator RSSI voltage at U2 13 6 4 2 Audio Processing Buffer U3 14 supplies audio to pot R51 which is used to set
37. ONAL EXTERNAL DELAY BOARD cas NOT INSTALLED 8 NOT INSTALLED BREAKS AUDIO OUT AT DELAY OUT RETURN IN AT DELAY_IN NOT INSTALLED NOT INSTALLED ROUTES AUDIO TO OPTIONAL TONE BOARD BREAKS AUDIO JONE JRT RIA 488 IRIS OUT AT TO TONE AND RETURNS AT FROM TONE cas NOT INSTALLED Q tuF OF STI ETA TO OPTIONAL EXTER po NG sm mn DELAY TONE R7 RTE TONE BOARD O ROT 27K4 22K1 1261 DE EMPH JRIS JRIE AC_OUT DE EMPHASIZED ME Ed Er o zo ROB 15K 16K8 sk FAT JR 16 AC_OUT FLAT R22 2784 300 27K4 SQUELCHED LINE AUDIO JR JR ROUTES SQUELCHED AUDIO TO THE OPTIONAL LINE DRIVER aT Fr ETTE une de AQ Ma R25 20k 581K 2K UNSQUELCHED UNE AUDIO JR JRA ROUTES UNSQUELCHED AUDIO TO THE OPTIONAL LINE DRIVER ba NM cona aa e R129 100K 82 5K 100K VOTING TONE ENABLE 35 URS ENABLES AUXILLARY TONE INPUT OPTIONAL CA 1 2n tan 419 VOTING TONE DISABLE RS JRS DISABLES AUXILIARY TONE INPUT OPTIONAL paa Pa cs usr cu um 47n in PASS THRU JRA JRI4 RIB JR7 JR13 JRI5 STANDARD XC ja AH i ji ri peh o o si C43 C44 330pF Xp NOT INSTALLED VOBIS A 98 04 25 Figure 10 2 IF Audio Board Schematic continued Page 10 4 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 TUN C77 t m sal R73 R5 100 T To T Ou K 51 1 C18 1N914 e zli Q2 12V 2N3906 P1 P11 51 3 HAT mm R58 ar 2 11 5K z NI 1X R822 R92
38. RL 903 Receiver Issue 1 Rev C 12 10 96 RL 903 900 Receiver USER MANUAL 9110 00148 oi part number 816 0903 01 RELEASED Specifications subject to change without notice Copyright 1996 Glenayre All rights reserved No part of this work may be reproduced or copied in any form or by any means graphic electronic or mechanical including photocopying recording taping or information retrieval system without written permission of Glenayre Print Date 12 05 96 Copyright 1996 Glenayre RL 903 Receiver Glenayre Document Number 9110 00148 Document Change Record Issue 1 Rev C 12 10 96 Document Change Record Issue l Date 08 31 94 Changes none original Issue Date 12114 95 Changes new format Issue 1 Rev C Date 12 10 96 Changes minor corrections added schematics Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Print Date 12 05 96 Table of Contents GENERAL Lua 1 1 11 Manual Scope 1 1 1 2 Applicable Document icesesrereniaiire ro e A AT A 1 1 1 3 Manual Sections 1 1 1 4 About Glen yte eee EE TESTA 1 2 1 4 1 Product Warranty Infomation 13 1 4 2 Service Warranty Information 1 3 15 Regulatory Authority Compliance ot ona tisse ets 1 3 1 5 1 FCC 1 3 1 5 2 Industry Canada 1 3 SPECIFICATIONS
39. T open squelch TIGHT carrier squelch TIGHT 4 turn pot adjusts carrier squelch threshold level SQUELCH R81 NORMAL 4 turn pot adjusts noise squelch threshold level SQUELCH R30 SQUELCH indicates unsquelched when lit D14 green LINE OUT R57 optional 4 turn pot adjusts level of line audio option at J2 10 15 LINE OK HI green optional line output J2 10 15 TB2 7 8 at or above 0 dBm DIS red green red line output too high 2 dBm see Paragraph 7 7 REMOTE DIS REMOTE allows remote keying KEY Si DIS disables remote keying KEY keys output line locally KEYLINE D11 when lit indicates TXKEY line J2 3 TB3 1 is active green synthesizer V CO FAULT DI when lit indicates synthesizer fault fault output J1 14 TB3 4 active HI at same time red Page 5 2 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 I ON 0 0FF 0000 0000 000 0 PS A R27 SPEAKER amp SPEAKER LINE LEVEL IF ON WHEN SUPPLIED Print Date 12 05 96 SQUELCH RMA O D21 POWER IS IF BOARD L NORMAL TIGHT IF D14 ON WHEN UNSQUELCH LINE OUT KEY LIN Ds O uj REMOTE IF D15x LINE OUTPUT INDICATOR IF ON WHE EY E FAULT SYNTH DI ON IF OUT OF LOCK D11 N TxKEY IS ACTIVE ED OPTIONAL Figure 5 1 Front Panel Controls and Indicato
40. V 432 24 C66 57 16 HELICAL FILTER L2 L3 L4 Da A V RF INPUT 922 960MHz HIGH INTERCEPT LOW NOISE AMP CAN 12dB TYP BANDPASS FILTER NOISE FIGURE 248 TYP INSERTION LOSS 1 848 TYP 3dB BANDWIDTH 10MHz TYP ATTENUATION Fc 90MHz 60dB TYP HELICAL_FILTER L7 LB BANDPASS FILTER INSERTION LOSS 1 8dB TYP 348 BANDWIDTH 10MHz TYP ATTENUATION Fc 90MHz Figure 10 3 Front End Schematic Print Date 12 05 96 Copyright 1996 Glenayre L9 NOTES RL 903 Receiver FIGURES 1 JUMPER J4 FOR TUNEUP W1 TO W2 JUMPER TO U1 FOR NORMAL OPERATION W2 TO W3 SHOWN IN NORMAL POSITION J4 SEE NOTE 1 W2 W3 i U1 MD173 Jar 1 3 VO813 A 95 04 19 8 p12 J2 60dB TYP C75A L 1 500 5 6pF 26 p 514 877 915MHz V Page 10 5 RL 903 Receiver FIGURES Page 10 6 Glenayre Document Number 9110 00148 vielse i y vv ET TAR kod I y i ua RAI uw si Figure 10 4 V CO Board Schematic Copyright 1996 Glenayre Be zo Issue 1 Rev C 12 10 96 Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 SW LZ art dios I d NT TB1 avin JA 10 8 3M 2 R1 100 Q1 ps zR 04 C3 ING1483 470K 100n na 1N4148 Ka C L ca 2200 78 mgt Ga 4025 zs ss E dar 22p MR752 Dy K 1NA2458 15V 12W REG T1 p2 VK2002 1 HI
41. al not used in determining above specifications keytone notch filter center frequency Hz 2875 or user selectable notch depth dB below full 25 modulation 1 dB bandwidth at 2875 Hz Hz 2835 to 2915 keytone decoder frequency Hz 2875 or user selectable sensitivity dB 32 below 1 3 kHz deviation or better turn on time ms 200 hold time ms 100 Copyright amp 1996 Glenayre Page 2 3 RL 903 Receiver Glenayre Document Number 9110 00148 SPECIFICATIONS Issue 1 Rev C 12 10 96 Page 2 4 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 DESCRIPTION 3 DESCRIPTION 3 1 Introduction The receiver may be used in three types of applications or in various combinations link repeater receiver for link transmitter R link receiver with external control XC for paging transmitter Additionally in combination with any of these it may be used as a monitor receiver with line driver LD suitable for telephone lines 3 2 Physical Description The receiver is normally mounted in a standard rack and requires two rack units Table 2 1 includes physical characteristics These are the main assemblies RF board F board VCO assembly synthesizer board power supply audio amplifier PS A interface board attached to the rear of the chassis not used in some configuration
42. allation 9 2 VCO tuning fault LED 7 2 Print Date 12 05 96 Copyright 1996 Glenayre RL 903 Receiver s T TB1 7 1 telephone number 1 2 test equipment 4 1 test setup 7 9 TIGHT Squelch Adjustment Procedure 7 6 tone board check 8 2 connections 4 2 operation 6 1 specifications 2 1 tone keying 3 2 tuning range 3 1 V VCO board removal and reinstallation 9 2 volume control 6 1 W warranty 1 3 wideband 1 1 Page index 3 RL 903 Receiver Glenayre Document Number 9110 00148 W Issue 1 Rev C 12 10 96 Page 4 Copyright 1996 Glenayre Print Date 12 05 96
43. approved October 27 1992 and dated February 1993 Table 2 1 Specifications characteristic unit of measurement specification frequency range MHz 922 960 in special cases to 902 in bands as follows 900 920 920 940 940 960 modulation acceptance kHz wideband 7 0 narrowband 5 0 sensitivity uV for 12 dB SINAD wideband 0 35 narrowband 0 35 sensitivity uV for 20 of quieting wideband 0 5 narrowband 0 5 channel spacing KHz narrowband 12 5 wideband 25 adjacent channel rejection dB of rejec wideband 80 tion wideband 25 kHz narrowband narrowband 75 12 5 kHz alternate channel rejection dB of rejec wideband 85 tion wideband 50 kHz narrowband narrowband 80 25 kHz intermodulation dB wideband 80 narrowband 75 spurious response dB wideband 100 narrowband 100 maximum squelch sensitivity TIGHT wideband 65 carrier squelch dBm narrowband 65 minimum squelch sensitivity NOR wideband 113 MAL noise squelch dBm narrowband 113 speaker output distortion percent 5 or better hum and noise 3 kHz deviation with wideband 40 1 kHz tone dB narrowband 40 output power W 1 5 Print Date 12 05 96 Copyright 1996 Glenayre Page 2 1 RL 903 Receiver SPECIFICATIONS Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Table 2 1 Specifications continued ch
44. aracteristic unit of measurement specification audio response 3 X to 3000 Hz dB 8 from nominal 750 usec deemphasis curve flat audio output max distortion at 1 kHz 2 3 modulation percent wideband 1 5 narrowband 2 5 hum and noise dB to 3 kHz wideband 50 narrowband 50 frequency response dB with respect to 1000 Hz wideband 1 narrowband 1 phase linearity max degrees of deviation from RL 900 wideband 10 narrowband 10 line driver output level dBm 15 to 5 normally 0 dBm max frequency response variation from 1000 Hz dB wideband 0 5 narrowband 0 5 input power 10 6 to 29 Vdc at less than 2 A 3 A peak operating temperature range degrees 30 to 60 centigrade storage temperature degrees centi 40 to 85 grade relative humidity noncondensing 5 to 95 percent altitude ft to 10 000 3050 m chassis dimensions 3 5 in 9 cm high x 19 in 48 cm wide x 8 in 20 3 cm deep excluding front and rear pro jections chassis weight 5 7 Ib 2 6 kg FCC ID BFL RL 903 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Print Date 12 05 96 RL 903 Receiver SPECIFICATIONS Table 2 1 Specifications continued characteristic unit of measurement specification tone board option
45. d by the customer Shipping from Glenayre will be prepaid by the customer and shipped via surface mail If express shipping is required the unit will be shipped collect Any repair service performed by Glenayre under this limited warranty is warranted to be free from defects in material or workmanship for ninety days from the date of repair All other terms of this limited warranty apply to the service warranty 1 5 Reaulatorv Authoritv Comoliance 1 5 1 1 5 2 Print Date 12 05 96 FCC This device complies with part 15 of the FCC Rules Operation is subject to the condition that this device does not cause harmful interference Industry Canada This device complies with RSS 210 of Industry Canada Operation is subject to the following two conditions this device may not cause interference and this device must accept any interference including interference that may cause undesired operation of the device Copyright 1996 Glenayre Page 1 3 RL 903 Receiver Glenayre Document Number 9110 00148 GENERAL Issue 1 Rev C 12 10 96 Page 1 4 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 SPECIFICATIONS 2 SPECIFICATIONS Table 2 1 Specifications lists the specifications of the receiver All receiver tests were performed per the ANSI EIA 603 1992 standard Land Mobile FM or PM Communica tions Equipment Measurement and Performance Standards
46. en reattaching plugs onto pc boards be certain to observe correct polarity and alignment Note The VCO board contains internal switches which are used to program the receive frequency The IF board contains jumpers which characterize its operation The IF board may be wideband or narrowband The TONE board contains switches which determine its decoding and notch frequency If you replace one or more of these boards or the entire receiver ensure that the replacement is configured the same as the original 9 1 Access to Internal Assemblies Print Date 12 05 96 Perform the following procedure to gain access to the controls on internal assemblies or to remove or install them Accessing Internal Assemblies Remove all input power from cabinet Slide receiver mostly out of rack by removing screws which hold front panel to rails and pulling forward to gain access to rear Mark and disconnect wires and connectors which are connected to rear of chassis If interface board is part of station wiring leave it connected to station wiring and dis connect it from rear of receiver by unscrewing retaining screws from standoffs Pull off removable portion of TB 1 some versions If not needed for troubleshooting leave connected to system wiring Complete removal of receiver from rack Remove cover by loosening appropriate screws pulling up on front of top cover and sliding cover toward rear Place receiver on test bench and make
47. entered voltage results in improved performance over temperature extremes and yields improved phase noise performance VCO Adjustment Procedure 1 Refer to Figure Figure 7 1 2 Check control voltage at TP1 near S1 Voltage should be 5 7 Vdc 3 If necessary adjust C46 to bring control voltage into range 7 5 RF and IF Tuning IF board unless noted Apply standard test signal and reduce generator level to check that receiver meets minimum sensitivity listed in Table 2 1 Specifications If specifications are met tuning is not recom mended Refer to Figure 7 4 RF Assembly Adjustments and Figure 7 5 IF Board Controls and Indicators Unless noted references are to the IF board Attach test equipment as shown in Figure 7 2 Second Local Oscillator Adjustment Procedure Note Hint If sensitivity is low and there is question whether the trouble lies in the RF section or the IF section inject a 45 MHz signal into IF board P5 and adjust the 45 MHz and 455 kHz circuits The 12 dB SINAD at P5 should be 116 dBm or better Once proper operation of the IF section is validated concentrate on the RF section and local oscillator Page 7 2 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 MAINTENANCE RF and IF Tuning Procedure Note Hint You may prefer to use the RSSI output at RF board J1 12 TB3 5 rather than tuning for maximum sensitivity by ea
48. ered audio and a signal strength indicator which are passed to the audio and squelch circuitry Print Date 12 05 96 Copyright 1996 Glenayre Page 3 1 RL 903 Receiver DESCRIPTION Page 3 2 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 The audio dc signal is dc coupled all the way from the quadrature detector to J1 The audio ac signal is filtered to produce standard transmitter audio This signal may be routed through the optional tone board to produce a logic indication if a control tone is detected and to optionally notch out the control tone to a transmitter tone is normally not notched For a discussion of the tone board refer to its manual See Table 1 1 An external delay device or other type of audio processor may be spliced into the audio path depending on jumper settings See Table 7 7 IF Board Controls and Indicators The received signal strength indicator is a dc voltage which gives a relative indication of the signal strength The R tone controlled link receiver reserves a segment of the audio passband normally a narrow band centered on 2875 Hz for control purposes The presence of a tone at that frequency causes the keyline to the transmitter to become active The R receiver can be set up to notch the control tone out of the audio passband but the R receiver normally passes the control tone along with the rest of the audio passband Refer also to the system theory of operation of the associated
49. for a period of twelve months from the original invoice date subject to the provisions herein Glenayre will repair or replace at its option FOB our factory free of charge within one year from the date of shipment any component assembly or subassembly of our manufacture found to be defective under conditions of normal use The unit if repaired will be returned to its original specifications Failures caused by unau thorized modifications force majeure lightning physical environmental or electrical damage including use with incompatible equipment are specifically excluded from this warranty Glenayre disclaims any and all liability for loss or other damage whether direct consequential or of any nature whatsoever resulting from product failure This warranty is in lieu of all other warranties expressed or implied and covers only those items manufactured by Glenayre Equipment supplied by but not manufactured by Glenayre is subject only to any warranty offered by the manufacturer of said equipment Service Warranty Information Return of a defective item must be authorized by Glenayre prior to shipment A Return Authorization number can be obtained from Glenayre Customer Service When requesting a Return Authorization number give the serial number of the unit A description of the fault should accompany the unit on its return and the RA number must be shown on labels attached to the item s The cost of shipping to Glenayre is to be pai
50. ipment If I O connections are required refer to the system interconnect diagram and other instructions in the system manual 4 4 4 Internal Test Points Switches and Jumpers Refer to Figure 7 4 RF Assembly Adjustments Table 7 6 RF Board Controls lists RF board controls Refer to Figure 7 1 Synthesizer Controls and Indicators Table 7 1 VCO Controls and Indicators lists VCO synthesizer controls and indicators Refer to Figure 7 5 IF Board Controls and Indicators Table 7 7 IF Board Controls and Indicators lists IF board controls and indicators Refer to Figure 7 6 PS A Board Controls and Indicators Table 7 8 PS A Board Controls lists PS A board controls Tone board adjustments are discussed in the tone board manual see Table 1 1 for part number There are no indicators on the tone board 4 5 Ultimate Disposition Caution This equipment may contain hazardous materials Check with the local EPA or other environmental authority before disposing of this equipment Page 4 2 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 RL 903 Receiver INSTALLATION AND SETUP Table 4 2 1 0 Connections label on 1 0 connection board label schematic connection note PS A board TB 1 2 10 6 30V positive input to receiver TBI 1 GND negative return to power supply IF board
51. ltage at IF board P7 1 and 2 Level should be same as in previous step 7 Refer to Figure 7 1 Check voltage at VCO board U10 output 0 10 is next to refer ence assembly Ul 1 output is at leg toward corner Level should be 4 75 to 5 25 Vdc 8 2 Audio IF board unless noted Print Date 12 05 96 This procedure verifies that the audio section is functioning properly Refer to Figure 7 5 IF Board Controls and Indicators Audio Checks Verify that the audio section is working in order to more easily troubleshoot RF and IF problems 1 Set SQUELCH switch S2 to TEST Be sure that SQUELCH LED D14 is lit indicat ing open squelch 2 Apply standard test signal to receiver Note that RSSI voltage at J1 12 TB3 5 can indicate status of RF and IF stage even if audio section is not functioning 3 Verify that installation of jumpers is correct Refer to Table 7 7 IF Board Controls and Indicators Be sure that R51 is not turned completely down 4 If receiver uses tone board temporarily disable tone board path by setting JR7 JR8 to JR8 Copyright O 1996 Glenayre Page 8 1 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 REMOVAL AND REINSTALLATION 9 REMOVAL AND REINSTALLATION Remove all power from the equipment before performing any of the following procedures Note Unless otherwise noted the reinstallation of assemblies is obvious from reading the procedure for removal Caution Wh
52. moval and reinstallation 9 2 Page index 2 Copyright 1996 Glenayre Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Q quadrature detector 6 4 R rear panel connections 4 3 removing 9 2 received signal strength indicator 3 2 Receiver REF Sensitivity Checks 8 2 reference oscillator 6 2 setup 7 1 regulated power 6 1 regulatory compliance 1 3 Removing 9 2 RF tuning 7 2 RE amplifier troubleshooting 8 2 RF and IF Tuning Procedure 7 5 RF board controls 7 13 7 17 removal and reinstallation 9 3 tuning procedure 7 5 RF input 6 1 RF INPUT J1 7 1 RSSI description 3 2 from U2 6 5 level 7 7 level observation and recording 7 7 levels when receiving a signal from link trans mitter 7 8 operation 6 4 Print Date 12 05 96 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 S selectivity 6 4 sensitivity check 8 2 specifications 2 1 squelch adjustment 7 6 carrier 6 4 checks 8 2 noise 6 4 noise adjustment 7 6 normal adjustment 7 6 switch S2 6 4 tight adjustment 7 6 troubleshooting 8 2 standard test signal 7 5 synthesizer BASIC listing for programming 7 10 channel spacing 6 1 checkout 8 2 controls and indicators 7 3 7 4 DIP switch settings for common frequencies 7 13 DIP switches 7 12 functional diagram 6 3 PLLsynthesizer steps 6 2 programming 7 11 programming procedure 7 1 7 11 reference oscillator 6 2 reset 7 2 steps 3 1 tuning steps 6 1 VCO 6 2 VCO board removal and reinst
53. nayre Document Number 9110 00148 DESCRIPTION Issue 1 Rev C 12 10 96 TB1 2 TBS 1 GROUND DC AUDIO KEY 2 DEN AC AUDIO SQUELCH IND 3 GROUND GROUND 4 TO EXT DELAY FAULT IND 5 FROM EXT DELAY RSSI IND 6 GROUND GROUND 7 LINE OUT INTERLOCK 8 UNE OUT INTERLOCK O T82 85 00000000 00000000 EXTREF 12345678 181 ie e GND 10 8 30V 1 2 150 84 05 18 1 0 BOARD OPTIONAL Figure 3 2 Receiver Rear View Page 3 4 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 DESCRIPTION RF INPUT JI 1 0 BOARD EXTERNAL POWER TO PS A IF ATTACHES HERE REFERENCE TB JI OPTIONAL BNC FEMALE FRONT END FF AMPLIFIER VCO SYNTHESIZER MIXER V0145 D 95 08 03 Figure 3 3 Top View of Internal Assemblies Print Date 12 05 96 Copyright O 1996 Glenayre Page 3 5 RL 903 Receiver DESCRIPTION EXTERNAL REFERENCE OPTIONAL Z 4 12VDC gt POWER FM DETECTOR u2 gt 12VDC Page 3 6 AUDIO amp SQUELCH CIRCUITRY U3 u8 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 FAULT _ OUT OF LOCK FAULT TO IF BOARD TONE DECODER BOARD OPTIONAL AUDIO DC a 149 0 94 08 24 Figure 3 4 Receiver Functional Diagram Copyright 1996 Glenayre
54. nection Z2 note P8 8 de emph de emphasis P2 8 JI see I O table chassis PS A board SW SWI connection to front panel on off switch PI connection to front panel speaker P1 1 lt hot P1 2 ground Print Date 12 05 96 Copyright 1996 Glenayre Page 4 5 RL 903 Receiver Glenayre Document Number 9110 00148 INSTALLATION AND SETUP Issue 1 Rev C 12 10 96 Page 4 6 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 OPERATION 5 OPERATION 5 1 Front Panel Controls and indicators Figure 5 1 Front Panel Controls and Indicators Shows the locations of operator controls and indicators Table 5 1 Front Panel Controls and Indicators describes their functions 5 2 Operating Instructions The receiver operates in an unattended manner during normal system operation Refer to the system manual and the maintenance section of this manual for maintenance action including setup Print Date 12 05 96 Copyright 1996 Glenayre Page 5 1 RL 903 Receiver Glenayre Document Number 9110 00148 OPERATION Issue 1 Rev C 12 10 96 Table 5 1 Front Panel Controls and Indicators control or indicator function PS A board SW1 on O off VOLUME R27 adjusts front panel speaker level IF board POWER D21 on indicator green SQUELCH S2 selects noise squelch test open or carrier squelch NORMAL noise squelch TES
55. off up and 0 ON down Print Date 12 05 96 Copyright 1996 Glenayre Page 7 1 RL 903 Receiver Glenayre Document Number 9110 00148 MAINTENANCE Issue 1 Rev C 12 10 96 3 Install and remove JRA to reset synthesizer Once synthesizer frequency is pro grammed front panel red FAULT LED should be off If it is on coarse tuning of VCO may be necessary Refer to VCO tuning procedure If FAULT LED is off pro ceed to next step 4 Apply standard test signal at newly programmed frequency If test signal is heard programming new frequency was successful 5 Connect frequency counter to VCO output SMA connector that goes to RF board J2 Frequency should be receive frequency minus 45 MHz If 1 0 frequency is off by more than 10 kHz check programming steps 6 To precisely set reference frequency slowly adjust U6 trim cap if using internal ref erence oscillator while checking detected audio for minimum distortion done as part of RF and IF Tuning Procedure 7 Once Lo frequency is changed and verified check VCO voltage using VCO Adjust ment Procedure 8 optional Measure l o injection level with spectrum analyzer or RF millivoltmeter level should be 15 to 17 dBm 7 4 VCO Tuning synthesizer board unless noted Perform the following procedure whenever a major change in receive frequency has been effected or when it is necessary to check performance especially if the FAULT LED is lit Even if the FAULT LED is off a c
56. pled audio fed to J1 2 TB2 2 Shaded items are accessible from the front panel detected audio TP2 RSSI Shaded items are accessible from the front panel Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 MAINTENANCE KEY he p eR e re 111 NE C52 S1 Ba De OUADRATURE IF INPUT OK GRN VOTING vs RD NOT USED ANE LINE AUDIO SQUELCH LB IF L1 1F L3 IF R57 OUT OPTIONAL pans TONE KA B H JR3 JR6 B SQUELCH D14 ON WHEN Dod DOD jo JR4 JR5 S m ouo i UNSQUELCHED TP1 R80 NORMAL M EVEL DETECTED AUDIO R81 NGHT J1 P6 TP2 P7 WES NORMAL TEST 1 T AT JRI6 RSSI TIGHT JR15 SAUDI DEEMPH DELAY LARITY 75 Ru Wii iem TRE pix JR14 JRB JRO 3211 POWER SHIELDED AREA LOCATION OF OPTIONAL TONE CONTROL BOARD Figure 7 5 IF Board Controls and Indicators Print Date 12 05 96 Copyright 1996 Glenayre V0147 D 95 08 03 Page 7 19 RL 903 Receiver MAINTENANCE Page 7 20 Glenayre Document Number 9110 00148 Table 7 8 PS A Board Controls Issue 1 Rev C 12 10 96 reference designator function VOLUME R27 adjusts front panel speaker level SWI controls power input to power supply SW2 jumper to enable speaker audio m O F1 3A SW1 E or sl l I 1 fe
57. r 1 Attach RF signal generator to rear panel antenna input J1 Set generator to receive frequency Modulate with 1000 Hz tone at 1 3 0 kHz deviation 1 5 kHz for 12 5 kHz spaced channels Set level to 47 dBm Note This is the standard test signal standard test signal 2 Set front panel SQUELCH switch to TEST 3 Adjust speaker audio level with VOLUME control to suit user preference Caution The RF front end adjustments should be tuned for a relatively flat response characteristic not for peak response Do not perform steps 4 through 8 unless this is an emergency repair The factory setup procedure requires a spectrum analyzer Call Glenayre for assistance in replacing the assembly or in performing the alignment Alignment should not be necessary unless a major change in frequency has taken place 4 Referto Figure 7 4 Loosen lock nuts on RF assembly resonators L2 L3 L4 L7 L8 and L9 5 Reduce signal generator input as required Using hex wrench adjust resonators in se quence for maximum sensitivity Repeat this step until no further improvement is not ed 6 Adjust RF resonators L2 L3 LA L7 L8 and L9 for signal peak While holding reso nators firmly with hex wrench tighten all lock nuts to prevent further resonator movement Constantly check that receiver sensitivity has not been degraded by inad vertent movement of resonators or stress to mechanical assemblies Caution Do not overtighten lock nut
58. r the mixer and to U12 for use by the synthesizer to maintain phase lock Capacitor C46 centers the VCO control voltage at TP1 6 3 2 PLL Synthesizer A portion of PLL U8 compares the phase difference between the internally divided frequencies which are fed to it from the reference oscillator and the VCO The phase differ ence causes an error voltage which feeds back to keep the VCO frequency phase locked The feedback signal is passed through a low pass filter to suppress 6 25 kHz components and is fed to VCO varactor D2 for fine electronic frequency adjustment and is also fed via buffer U13A to TP1 for alignment purposes 6 3 3 Reference Oscillators On board reference oscillator U11 or an external high stability reference can be used depending on the setting of JR1 Oscillator Ull operates at 12 8 MHz The external oscil lator may be 10 or 12 8 MHz depending on JR3 Refer to Table 7 1 VCO Controls and Indicators 6 3 4 Programming Logic Astable multivibrators U7A and U7B are triggered if an out of lock or reset condition exists Multivibrator U7 12 resets four bit BCD counters U1 and U2 while multivibrator U7 4 starts clock U6 to trigger the counters The counter output is input to GAL IC U3 which is programmed to provide the reference divider sixteen bit data and serially clock it into synthesizer U8 through the clock and data outputs An enable pulse is outputted from the GAL to latch the reference divider data A control bit and
59. rs Copyright 1996 Glenayre RL 903 Receiver OPERATION CDI Glena RECEIVER CD VO143 E 94 06 16 Page 5 3 RL 903 Receiver Glenayre Document Number 9110 00148 OPERATION Issue 1 Rev C 12 10 96 Page 5 4 Copyright 1996 Glenayre Print Date 12 05 96 Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 THEORY OF OPERATION 6 THEORY OF OPERATION 6 1 PS A Board 6 1 1 The dual conversion synthesized narrowband FM receiver covers 922 to 960 MHz The optional tone board provides tone decoding and keying logic The optional line driver circuit supplies receiver audio to telephone lines Table 4 3 Internal Connections among Assemblies shows the interconnections among assemblies Figure 7 6 PS A Board Controls and Indicators Shows a view of the pc board Power Supply Table 2 1 Specifications lists the electrical requirement for input power Refer to Figure 10 5 PS A Board Schematic Unregulated power entering from TB1 2 is fused by pc board mounted F1 and is controlled by front panel mounted SW1 Switch converter Ul and associated components provided filtered regulated power approximately 15 1 Vdc to the input of linear voltage regulator U2 which supplies twelve volts to the rest of the unit 6 1 2 Audio Amplifier Op amps in U4 amplify and deemphasize the audio supplied to speaker driver U3 Front panel VOLUME control R27 controls the speaker level 62
60. s 7 Passband ripple tends to he additive when all adjustments are made to cause a peak response at a single frequency To ensure that passband ripple does not degrade per formance due to temperature drift set synthesizer to 3 MHz above carrier frequency and set signal generator accordingly Response should be within 2 5 dB of perfor mance at carrier frequency Print Date 12 05 96 Copyright 1996 Glenayre Page 7 5 RL 903 Receiver MAINTENANCE 10 11 12 13 14 15 Glenayre Document Number 9110 00148 Issue 1 Rev C 12 10 96 Repeat sensitivity check at 3 MHz below carrier frequency Set synthesizer and signal generator back to carrier frequency when done Be sure to have front end adjustment performed by factory personnel as soon as possible Refer to Figure 7 5 On IF board adjust LI L3 LS L7 and L8 for maximum sensi tivity Repeat this step until no further improvement is noted narrowband receiver only Adjust C51 for maximum sensitivity Place audio analyzer probe at ac audio line J1 1 TB2 1 Adjust L5 for minimum distortion with 100 Hz audio signal Set signal generator level to 47 dBm and restore audio frequency to 1000 Hz Distor tion may be minimized by slightly detuning L1 L3 and L7 for minimum distortion as observed on distortion analyzer Use audio oscillator and distortion analyzer to measure distortion at 1000 Hz and adjust for best overall distortion Do not detune components more than 1
61. s Additional components may need to be installed in order to enable the line driver output For views of the receiver refer to Figure 3 1 Receiver Isometric Front View Figure 3 2 Receiver Rear View and Figure 3 3 Top View of Internal Assemblies An optional tone control board may be used and is mounted on the IF board 3 3 Simplified Block Diagram Description Refer to Figure 3 4 Receiver Functional Diagram The RL 903 is a self contained receiver capable of covering the range of paging and link frequencies between 922 MHz and 960 MHz Channel spacing is 12 5 or 25 kHz The radio has a synthesized local oscillator The receive frequency is set in 6 25 kHz steps by a selection of DIP switches The electronic tuning range is approximately one MHz before manual coarse oscillator retuning is required The 900 MHz signal enters at the rear of the chassis and is routed to the RF assembly where it is amplified and mixed to produce a 45 MHz IF signal An internal or external reference oscillator furnishes the reference for the synthesizer The VCO output is routed to mixer Ul on the RF assembly For a description of the synthesizer and VCO refer to Paragraph 6 3 Synthesizer and V CO Block Diagram Description IF amplifiers Q5 and Q6 amplify the first IF signal and make up any losses caused by the insertion loss of the IF filters FM detector chip U2 is the second mixer and quadrature detector for the receiver Its output includes the recov
62. ut power 28 Vdc or within range of specifications is supplied to rear mounted TB1 2 10 6 30V and ground TB1 1 GND Turn on front panel power switch Front panel POWER LED IF board should light Check that input power is present at D4 cathode near right rear corner of pcb Check voltage at red TP1 Voltage should be 11 5 to 12 5 Vde Check voltage at red TP2 Voltage should be 14 5 to 15 5 Vde SEEN TES UD 7 3 Local Oscillator Setup synthesizer board unless noted Perform the following procedure whenever it becomes necessary to set the receive frequency If an external oscillator is normally used when the receiver is in an equipment rack set JR1 to 2 3 and remove set movable jumper so that it makes no electrical connec tion JR3 An internal reference oscillator must be present before the procedure can be performed Restore jumpers to normal operating positions when done Figure 7 1 Synthe sizer Controls and Indicators shows synthesizer controls and indicators Synthesizer Programming Procedure 1 Determine required receive frequency If the frequency is listed in Table 7 5 Synthe sizer Switch Settings for Common Frequencies use appropriate switch settings Oth erwise calculate hexadecimal and binary values of A and N and switch settings by using BASIC program listed with Figure 7 4 Test Setup or use formula with calcula tor 2 Setsegments of DIP switches Si and S2 as required by results of step 1 Note that 1

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