Glenayre RL-903 User Manual Download

Page: 43 / 75

Glenayre Document Number: 9110.00148

RL-903 Receiver

Issue 1, Rev. C: 12/10/96

MAINTENANCE

The following procedure checks the approximate RSSI indication for various RF input
levels.

RSSI Level Observation Procedure

Set front-panel SQUELCH switch to TEST.

Connect voltmeter to J1-12 (TB3-5).

Set RF 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 Vdc.

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

Print Date:

12/05/96

Page: 7-7

Summary of Contents for RL-903

Page 1: ... 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 ...

Page 2: ...mber 9110 00148 Issue 1 Rev C 12 10 96 Document Change Record Issue 1 Date 08 31 94 Changes none original Issue 1 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 ...

Page 3: ...ription 3 1 3 3 Simplified Block Diagram Description 3 1 4 INSTALLATION AND SETUP 4 1 4 1 Precautions and Hazards 4 1 4 2 Test Equipment and Tools Required 4 1 4 3 Component and Adjustment Locations 4 1 4 4 Installation 4 2 4 4 1 Inspection 4 2 4 4 2 Power Requirement 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 5 OPERATION...

Page 4: ...ss noted 7 1 7 3 Local Oscillator Setup synthesizer board unless noted 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 Squelch and RSSI Adjustment IF board unless noted 7 6 7 7 Audio Level Adjustment IF board unless noted 7 9 8 CHECKOUT AND TROUBLESHOOTING 8 1 8 1 Power Supply PS A board unless noted 8 1 8 2 Audio IF board unless noted 8 1 8...

Page 5: ...onal Diagram 6 3 Figure 7 1 Synthesizer Controls and Indicators 7 4 Figure 7 2 Test Setup 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 7 19 Figure 7 6 PS A Board Controls and Indicators 7 20 Figure 10 1 Interface Board 265 0305 002 Assembly and Schematic 10 1 Figure 10 2 IF Audio Board Schematic 10 2 Figur...

Page 7: ...ons among Assemblies 4 4 Table 5 1 Front Panel Controls and Indicators 5 2 Table 7 1 VCO Controls and Indicators 7 3 Table 7 2 RSSI Levels 7 7 Table 7 3 RSSI Levels when Receiving a Signal from Link Transmitter 7 8 Table 7 4 Programming Synthesizer Frequency 7 11 Table 7 5 Synthesizer Switch Settings for Common Frequencies 7 13 Table 7 6 RF Board Controls 7 16 Table 7 7 IF Board Controls and Indic...

Page 9: ...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 1 2 Applicable Documents 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 par...

Page 10: ... 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 CANADA Glenayre Customer Service RF 1450 Kootenay Street 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 ...

Page 11: ...nufacturer of said equipment 1 4 2 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 ...

Page 13: ... 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 tion wideband 25 kHz narrowband 12 5 kHz wideband 80 narrowband 75 alternate channel rejection dB of rejec tion wideband 50 kHz narrowband 25 kHz wideband 85 narrowband 80 intermodulation dB wideband 80 n...

Page 14: ...and 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 centigrade 30 to 60 storage temperature degrees centi grade 40 to 85 relative humidity noncondens...

Page 15: ...etermining above specifications keytone notch filter center frequency Hz 2875 or user selectable notch depth dB below full modulation 25 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 1996 Glenayre Print Date 12 05 96 Page 2 3 ...

Page 17: ...he 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 electroni...

Page 18: ...passes the control tone along with the rest of the audio passband Refer also to the system theory of operation of the associated 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 th...

Page 23: ...een 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 item characteristic service monitor to 1 GHz IFR model 1200S or equivalent frequency counter to 1 GHz digital voltmeter Beckman model 330 or equivalent audio distortion analyzer capable of measuring audio distortion to 3000...

Page 24: ... 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 a...

Page 25: ...d 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 RSSI IND TB3 5 see text GROUND TB 3 6 chassis ground J1 7 interlock INTER...

Page 26: ... J2 IF connection from RF assembly IF board tone board optional J5 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 aud...

Page 27: ...al Connections among Assemblies continued connection 1 label 1 label 2 connection 2 note P8 8 de emph de emphasis P2 8 J1 see I O table chassis PS A board SW 1 S W 1 connection to front panel on off switch P1 connection to front panel speaker P1 1 hot P1 2 ground Print Date 12 05 96 Copyright 1996 Glenayre Page 4 5 ...

Page 29: ...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 ...

Page 30: ...AL SQUELCH R80 4 turn pot adjusts noise squelch threshold level SQUELCH D14 green indicates unsquelched when lit LINE OUT R57 optional 4 turn pot adjusts level of line audio option at J2 10 15 LINE OK HI D15 red green green optional line output J2 10 15 TB2 7 8 at or above 0 dBm red line output too high 2 dBm see Paragraph 7 7 REMOTE DIS KEY S 1 REMOTE allows remote keying DIS disables remote keyi...

Page 33: ...fy and deemphasize the audio supplied to speaker driver U3 Front panel VOLUME control R27 controls the speaker level 6 2 RF Amplifier 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 helic...

Page 34: ... 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...

Page 36: ...l 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...

Page 37: ...receiver to be squelched 6 4 5 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 S 1 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 TB...

Page 39: ...s present at D4 cathode near right rear corner of pcb 4 Check voltage at red TP1 Voltage should be 11 5 to 12 5 Vdc 5 Check voltage at red TP2 Voltage should be 14 5 to 15 5 Vdc 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 equ...

Page 40: ...dure 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 centered 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 s...

Page 41: ...forming the alignment Alignment should not be necessary unless a major change in frequency has taken place 4 Refer to 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 L4 L7...

Page 42: ...ference oscilla tor adjust trim cap on U6 for minimum distortion Do not detune more than 1 4 turn 15 Restore jumpers and controls to normal positions 7 6 Squelch and RSSI Adjustment IF board unless noted The following procedure sets TIGHT squelch for normal operation TIGHT Squelch Adjustment Procedure 1 Set signal generator level for the desired signal quality typically 30 dB SINAD ap proximately ...

Page 43: ...SSI level should be less than 0 7 Vdc 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 ...

Page 44: ...9110 00148 MAINTENANCE 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 note Page 7 8 Copyright 1996 Glenayre Print Date 12 05 96 ...

Page 45: ...ulation 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 1Vp p Continue with the line audio procedure if necessary Line Audio Level Adjustment Procedure This circuitry is optional and is used in LD models 1 Perform this procedure after the preceding procedure is completed 2 Adjust front panel LINE OUT R57 so that front panel LINE OK HI ...

Page 46: ...S2 segments 1 4 HR 2 260 PRINT S2 segments 5 8 HR 1 270 PRINT NOTE 0 ON 1 off 280 PRINT 290 GOTO 130 500 REM calculate hex and binary 510 HH 0000 HH 520 HH RIGHT HH 4 530 FOR I 1 TO 4 535 B MID HH I 1 540 GOSUB 700 550 HI I A HR I RR 560 NEXT I 570 RETURN 700 REM look up binary values from hex 710 A 720 IF B 0 THEN A 0000 RR 0000 730 IF B l THEN A 0001 RR 1000 740 IF B 2 THEN A 0010 RR 0100 750 IF...

Page 47: ...equency 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 1 off filled in Table 7 4 Programming Synthesizer Frequency 4or8 3or7 2or6 lor5 E SlorS2switch segment setting of above switch seg ment 8 4 2 1 hex value decimal value 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 A 10 B 11 C 12 D 13 E 14 F 15 1 ...

Page 48: ...0 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 Figure 7 3 Programming Synthesizer Frequency Page 7 12 Copyright 1996 Glenayre Print Date 12 05 96 ...

Page 49: ... 15625 10011110 01010100 9283375 01001000 00010100 931 5375 01101000 01010100 932 16875 11011110 01010100 928 8625 01010110 00010100 9315625 01011000 01010100 932 18125 10111110 01010100 928 8875 01110110 00010100 931 5875 01111000 01010100 932 19375 11111110 01010100 928 9125 01001110 00010100 931 6125 01000100 01010100 932 20625 10000001 01010100 928 9375 01101110 00010100 931 6375 01100100 0101...

Page 50: ...5 10010010 00001100 956 2875 01110001 10011100 941 04375 11100000 00001100 941 46875 11010010 00001100 956 3125 01001001 10011100 941 05625 10010000 00001100 941 48125 10110010 00001100 956 3375 01101001 10011100 941 06875 11010000 00001100 941 49375 11110010 00001100 956 3625 01011001 10011100 941 08125 10110000 00001100 956 3875 01111001 10011100 941 09375 11110000 00001100 952 0125 01000111 011...

Page 51: ...000000 11101100 941 20625 10000100 00001100 952 2375 01000000 11101100 941 21875 11000100 00001100 952 2625 01010000 11101100 941 23125 10100100 00001100 952 2875 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...

Page 52: ...12 10 96 Table 7 6 RF Board Controls reference designator function L2 L3 L4 resonators on CAUTION helical filter 1 See text before L7 L8 L9 resonators on attempting to helical filter 2 adjust Figure 7 4 RF Assembly Adjustments Page 7 16 Copyright 1996 Glenayre Print Date 12 05 96 ...

Page 53: ...Issue 1 Rev C 12 10 96 MAINTENANCE Table 7 7 IF Board Controls and Indicators reference designato r function C51 L l L3 L7 L8 IF tuning and filter matching L5 quadrature coil C52 second l o fine tune Print Date 12 05 96 Copyright 1996 Glenayre Page 7 17 ...

Page 54: ...Y 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 JR11 JR12 10 11 true audio phase 9 12 inver...

Page 55: ...Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 MAINTENANCE Figure 7 5 IF Board Controls and Indicators Print Date 12 05 96 Copyright 1996 Glenayre Page 7 19 ...

Page 56: ...96 Table 7 8 PS A Board Controls reference designator function VOLUME R27 adjusts front panel speaker level S W 1 controls power input to power supply SW2 jumper to enable speaker audio Figure 7 6 PS A Board Controls and Indicators Page 7 20 Copyright 1996 Glenayre Print Date 12 05 96 ...

Page 57: ...ck voltage at TP2 Voltage should be 14 5 to 15 5 Vdc 5 Check voltage at TP1 Voltage should be 11 5 to 12 5 Vdc 6 Refer to Figure 7 5 Check voltage 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 U10 is next to refer ence assembly U11 output is at leg toward corner Level should be 4 75 to 5 25 Vdc 8 2 Audio IF board unless ...

Page 58: ... Access to Internal Assemblies Perform the following procedure to gain access to the controls on internal assemblies or to remove or install them Accessing Internal Assemblies 1 Remove all input power from cabinet 2 Slide receiver mostly out of rack by removing screws which hold front panel to rails and pulling forward to gain access to rear 3 Mark and disconnect wires and connectors which are con...

Page 59: ...connections Observe polarity of P2 3 Record arrangement of hardware and remove hardware holding IC heat sinks to side of chassis 4 Remove screws holding pc board to chassis and lift up and toward rear 9 3 IF Audio Board IF Board Removal 1 Remove rear panel 2 Mark and remove connectors for electrical connections Observe polarity of connec tors 3 Remove tone board if required 4 Remove screws holding...

Page 60: ...asten with hardware as appropriate Note Be certain that no loose hardware such as springs is lost while the VCO is out of its mounting 9 5 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 carefull...

Page 62: ...Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 FIGURES Figure 10 1 Interface Board 265 0305 002 Assembly and Schematic Print Date 12 05 96 Copyright 1996 Glenayre Page 10 1 ...

Page 64: ...Glenayre Document Number 9110 00148 RL 903 Receiver Issue 1 Rev C 12 10 96 FIGURES Figure 10 2 IF Audio Board Schematic continued Print Date 12 05 96 Copyright 1996 Glenayre Page 10 3 ...

Page 65: ...RL 903 Receiver Glenayre Document Number 9110 00148 FIGURES Issue 1 Rev C 12 10 96 Figure 10 2 IF Audio Board Schematic continued Page 10 4 Copyright 1996 Glenayre Print Date 12 05 96 ...

Page 70: ...e 1 2 ceramic filter 6 4 channel spacing 3 1 chassis dimensions 2 1 1 0 board removing from equipment rack 9 1 assembly 10 1 weight 2 1 schematic 10 1 control tone 3 2 I O connections 4 3 controls IF IF board 4 2 amplifier 6 1 6 4 PS A board 4 2 tuning 7 2 RF board 4 2 tuning procedure 7 5 VCO 4 2 IF amplifier crystal filter 6 4 sensitivity check 8 2 troubleshooting 8 2 D IF board Power Checks 8 1...

Page 71: ... 6 1 6 5 troubleshooting 8 2 option 1 1 RF and IF Tuning Procedure 7 5 specifications 2 1 RF board link repeater 3 1 controls 7 13 7 17 link repeater receiver 1 1 removal and reinstallation 9 3 local oscillator setup 7 1 tuning procedure 7 5 RF input 6 1 M RF INPUT J1 7 1 manual part numbers 1 1 RSSI models receiver 1 1 description 3 2 from U2 6 5 N level 7 7 level observation and recording 7 7 na...

Page 72: ... tight adjustment 7 6 tuning range 3 1 troubleshooting 8 2 V standard test signal 7 5 synthesizer VCO board BASIC listing for programming 7 10 removal and reinstallation 9 2 channel spacing 6 1 volume control 6 1 checkout 8 2 W controls and indicators 7 3 7 4 DIP switch settings for common frequencies 7 warranty 1 3 13 wideband 1 1 DIP switches 7 12 functional diagram 6 3 PLLsynthesizer steps 6 2 ...

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