RPT 633 TECHNICAL MANUAL for UHF TRANSMITTER MODEL RPT 633 and UHF SERIAL ENCODER MODEL RPE 673 Printed and published in England TM1184 Issue 1 AL1 (May 1997) Page (i)
RPT 633 COMPANY LIABILITY The information in this manual has been carefully compiled and checked for technical accuracy. Multitone Electronics plc accept no liability for inaccuracies or errors. In line with the company policy of technical advancement, the information within this document may be changed. The user should ensure that the correct issue of the document is used.
RPT 633 CONTENTS Page (i) Title Page Page (ii) Company Liability Page (iii) Contents Page (iv) Effective Page List Page (v) Safety Summary Warning Page (vi) Cautions Section 1 Introduction and Specification Section 2 Operating Instructions Section 3 Technical Description Section 4 Installation and Commissioning Section 5 Servicing Section 6 Spare Parts List Section 7 Diagrams Appendix 1 UHF Serial Encoder Model RPE 673 TM1184 Issue 1 AL1 (May 1997) Page (iii)
RPT 633 EFFECTIVE PAGE LIST Page No. Issue Page No. Issue Page No.
RPT 633 SAFETY SUMMARY The following information applies to both operating and servicing personnel. General Warnings and Cautions will be found throughout the manual where they apply. WARNING statements identify conditions or practices that could result in personal injury or loss of life. CAUTION statements identify conditions or practices that could result in equipment damage.
RPT 633 CAUTIONS DO NOT MOUNT OVER A HEATER OR RADIATOR, OR IN DIRECT SUNLIGHT AND ENSURE A DRY ENVIRONMENT. STATIC SENSITIVE DEVICES ARE USED WITHIN THIS EQUIPMENT. CARE MUST BE TAKEN TO ENSURE DAMAGE TO THESE DEVICES IS NOT CAUSED BY HIGH LEVELS OF STATIC ELECTRICITY. SPARE BOARDS OR COMPONENTS SHOULD BE STORED IN ANTI-STATIC PACKAGING WHEN NOT INSTALLED IN THE EQUIPMENT.
RPT 633 SECTION 1 INTRODUCTION AND SPECIFICATION CONTENTS: 1. INTRODUCTION 2. ROLE OF THE TRANSMITTER 4. PHYSICAL CONSTRUCTION 5. 6. 7. 8. 9. SPECIFICATIONS Transmitter Connectors Physical Characteristics Operational Enviroment Power Supply 10. CRYSTAL FREQUENCY CALCULATION _______________________ INTRODUCTION 1. Sections 1 to 7 of this manual outline the installation and operation of the Radio Paging Transmitter model RPT 633.
RPT 633 PHYSICAL CONSTRUCTION 4. The transmitter consists of two boards, a transmitter board mounted in the base assembly and a VOX keying module mounted in the cover assembly. SPECIFICATIONS Transmitter 5. The following describes the performance and physical characteristics of the RPT 633 UHF transmitter: a) Frequency Range: 420MHz to 470MHz b) Frequency Bands: Band 1 Band 2 Band 3 c) Channel Spacing: Factory set to 10kHz, 12.5kHz, 20kHz or 25kHz d) Frequency Stability 420MHz to 424.
RPT 633 Physical Characteristics 7. The dimensions and weight of the transmitter are as follows: a) Overall Dimensions: Width Depth Height 235mm (9.5in.) 210mm (8.3in.) 90mm (3.6in.) b) Weight (Excluding PSU): 1.2kg (2.65lbs.) Operational Environment 8. The environmental characteristics of the transmitter are as follows: a) Temperature Range: Operational -10EC to +50EC b) Humidity: 0-90% RH (non-condensing) c) Altitude: Up to 2000 metres Power Supply 9. 17V 0.
RPT 633 INTENTIONALLY BLANK Page 1 - 4 TM 1184 Issue 1
RPT 633 SECTION 2 OPERATING INSTRUCTIONS The transmitter is fully automatic in use and operation is limited to switching on the mains supply.
RPT 633 INTENTIONALLY BLANK Page 2 - 2 TM1184 Issue 1
RPT 633 SECTION 3 TECHNICAL DESCRIPTION CONTENTS: 1. INTRODUCTION 2. 3. 5. 6. 7. 8. 9. 10. 11. 13. 14. 15. 16. TRANSMITTER Power Supplies Mode Select Circuit Audio Input Data Input Crystal Oscillator High Stability Version Voltage Controlled Oscillator (VCO) Phase Locked Loop (PLL) Transmitter Keying Frequency Multiplier Band Pass Filter Driver Stages Output Amplifier 17. 18. 19. 20. VOX KEYING MODULE General Analogue Path Data Mode Decoding 21. 22. 23. 24. 29.
RPT 633 CONTENTS: (Continued) FIGURES 1. 2. 3. 4. 5. 6. Page Block Diagram Module Interconnection Diagram Speech Call Open Channel Speech Switching Into Speech Switching From Speech 3-2 3-6 3-8 3-8 3-9 3-10 _______________________ INTRODUCTION 1. The RPT 633 Transmitter accepts analogue or digital information which is modulated onto an UHF signal. The transmitter output frequency is produced by doubling the frequency of a voltage controlled oscillator (VCO).
RPT 633 Mode Select Circuit 3. With the mode input at 5V the Speech mode is selected. The output of IC6d is low, inhibiting the passage of Data by shorting the data path to 0V via D11 and enabling the passage of Audio by forward biasing D9. Variable resistor RV3 together with R102, R103, R108 and R116 hold the output of IC12d at approximately 0V, which in turn sets the voltage on varactor diode D8 to give the nominal carrier frequency of the transmitter. 4.
RPT 633 Crystal Oscillator 7. The reference oscillator TR11 is of the crystal controlled Colpitts type, operating on the fundamental frequency of the crystal which is 1/48th of the output frequency for Bands 1 and 2 and 1/56th of the output frequency for Band 3. The oscillator frequency is trimmed by VC5. Varactor Diode D8 provides the modulation, The capacitance of the diode, and therefore the oscillator frequency varies with the voltage across the diode. The output of the oscillator is buffered by IC8b.
RPT 633 Transmitter Keying 11. Normal transmitter keying is achieved by fitting a shorting link across LK1 pins 2-3. In the quiescent state the Tx Key line is at 5V, the output of IC6f is at 0V and the bias voltages of TR5 and TR8 are shorted to 0V. When the VOX keying module sets the Tx Key command to logic low the output of IC6f goes high impedance. Forward bias is applied to TR5 and TR8 providing the PLL is in lock. 12.
RPT 633 VOX KEYING MODULE General 17. The VOX keying module decodes encoder presented serial data and controls the transmitter. Interconnection between the Transmitter PCB and VOX Keying PCB is as shown in Figure 2. Figure 2: Module Interconnection Diagram Analogue Path 18. Analogue signals are input via external connector SK1 of the transmitter PCB and internal connectors TL8 and TL9.
RPT 633 Decoding 20. The VOX keying module decodes the incoming encoder serial data into the two logic signals shown in Table 1. Table 1: VOX Keying and Mode Signals NOTE: Tx KEY is active low. Tx KEY (PL1-2) MODE (PL1-3) TRANSMITTER STATE Low Low High Low High Low/High Data Mode Speech Mode Off OPERATION General 21. Components IC1a and IC1b are negative edge retriggerable monostables having output pulse widths of 4.5ms (OA) for the Mode signal and 2ms (OB) for the CLK signals to IC2.
RPT 633 Switching to Speech 24. To switch into the speech mode, either as part of a speech paging call or for open channel speech, the encoder generates two 1ms pulses 4ms apart as shown in Figures 3 and 4. Figure 3: Speech Call Figure 4: Open Channel Speech 25. The pulses are inverted at PL1-4 and the leading edge of the first pulse results in IC1-6 (OA) going high which switches PL1-2 low for 4.5ms (see Figure 3).
RPT 633 Switching from Speech to Data 29. The speech cancel signal consists of 1.25s of binary 1s. In the speech mode IC1-7 is high with the result that IC2-1 is low. The negative-going leading edge of the first bit of data clocks IC1a so that IC1-7 goes low, switching PL1-3 to the low DATA mode. The negative-going transition at IC1-5, IC1a times out with the result that: a) IC1-7 goes high putting PL1-3 into the quiescent condition. b) IC1-6 clocks IC1b for 2ms.
RPT 633 Figure 6: Switching From Speech Page 3 - 10 TM1184 Issue 1
RPT 633 SECTION 4 INSTALLATION AND COMMISSIONING CONTENTS: 1. INTRODUCTION 2. 3. 4. 5. 6. 8. INSTALLATION Positioning Shelf Mounting Wall Mounting Antenna Modulation Inputs Power Supply 9. COMMISSIONING TABLES Page 1. 2. 3. 4 - 4 4 - 4 4 - 5 Encoder Mounted in a Card Frame Assembly Encoder Mounted in a Single Slot Housing Operating Instructions FIGURES 1. 2. 3.
RPT 633 INSTALLATION Positioning CAUTION DO NOT MOUNT OVER A HEATER OR RADIATOR, OR IN DIRECT SUNLIGHT AND ENSURE A DRY ENVIRONMENT. 2. Carefully unpack the transmitter, power supply and antenna. Site the transmitter and power supply in a convenient working position within reach of an AC power outlet and within 1km of the encoder. Shelf Mounting 3. Lay the transmitter on a suitable horizontal shelf on its integral mounting feet (sloping panel upwards).
RPT 633 Antenna 5. Two versions of the UHF antenna are available, a straight vertical whip for wall mounted transmitters and a right angled whip for shelf mounted transmitters. Figure 2: Rear Panel Connections Modulation Inputs 6. When connecting the transmitter to an RPE 340 series encoder, SK1 and SK2 should be connected as shown in Figure 3.
RPT 633 7. When connecting an RPT 633 transmitter to a Access 3000, it is first necessary to use Engineering Mode Test 50 to configure the Encoder into the Non-DTMF mode. The connections shown in Table 1 and 2, as applicable, should then be made between the encoder and transmitter. Table 1: Encoder Mounted in a Card Frame Assembly SIGNAL NAME ENCODER PIN No. D TYPE PIN No.
RPT 633 COMMISSIONING 9. Refer to Table 3 and carry out the operating procedures as detailed for the RPT 633 transmitter. Table 3: Operating Instructions ENCODER REFERENCE Access 1000 Access 3000 } LCU Operator's Guide } 9261-0382 or 9261-0682 RPE 340 RPE 341 } TM1158, Section 2, paragraphs 19-40 } RPE 340A TM1154, Section 4, paragraph 4.
RPT 633 INTENTIONALLY BLANK Page 4 - 6 TM1184 Issue 1
RPT 633 SECTION 5 SERVICING CONTENTS: 1. INTRODUCTION 2. REPAIR POLICY 3. TEST EQUIPMENT 4. 5. 6. 7. DISMANTLING AND RE-ASSEMBLY INSTRUCTIONS Access to Circuit Boards Removing the VOX Keying Module Removing the Transmitter Board Re-Assembly 8. 9. 10. 11. 12. 13. TRANSMITTER BOARD ALIGNMENT PROCEDURE Initial Settings Initial Connections Setting up Phase Lock Loop Transmitter Alignment Setting Data Deviation and Centre Frequency Setting Analogue Modulation 14.
RPT 633 CONTENTS: (Continued) FIGURES 1. 2. Page Transmitter Layout: Variables, Links and Test Points Antenna Cutting 5-4 5-9 _______________________ INTRODUCTION 1. Section 5 details the dismantling and reassembly instructions, alignment procedure and the test equipment required to carry out the procedure. The transmitter contains two printed circuit boards (PCB's).
RPT 633 DISMANTLING AND RE-ASSEMBLY INSTRUCTIONS CAUTION STATIC SENSITIVE DEVICES ARE USED WITHIN THIS EQUIPMENT. CARE MUST BE TAKEN TO ENSURE DAMAGE TO THESE DEVICES IS NOT CAUSED BY HIGH LEVELS OF STATIC ELECTRICITY. SPARE BOARDS OR COMPONENTS SHOULD BE STORED IN ANTI-STATIC PACKAGING WHEN NOT INSTALLED IN THE EQUIPMENT. Access To Circuit Boards 4. Disconnect the antenna and connectors from the rear of the case. At the rear of the unit unscrew and remove the two retaining screws.
RPT 633 Figure 1: Transmitter Layout: Variables, Links and Test Points Page 5 - 4 TM1184 Issue 1
RPT 633 TRANSMITTER BOARD ALIGNMENT PROCEDURE Initial Settings 8. Set the variable components and links as follows: VC1 VC2 VC3 VC4 VC5 - Anywhere. Half Meshed. Fully Un-meshed. Fully Un-meshed. 25% Meshed. FL1 and FL2 - Adjusters standing proud by 2mm. RV1 RV2 RV3 RV4 - Fully Anti-clockwise. Mid Position (15 turns from either end). Anywhere Mid Position LK1 - Position 2-3 Normal Version. Position 1-2 FTZ Version. LK2 - Position 1-2 Output frequencies less than 447MHz.
RPT 633 Setting up Phase Lock Loop 10. Set up the Phase Lock Loop as follows: a) Switch on the power supply. b) Connect the oscilloscope to TP3. c) Adjust the slug of L1 to give 5V ±0.2V DC at TP3. Transmitter Alignment 11. To align the transmitter carry out the following procedure: a) Connect the oscilloscope to TP7. d) Adjust RV3 to give 0V ±50mV DC at TP7. c) Key ON the transmitter by shorting TP2 to TP9.
RPT 633 c) Measure the output frequency to the nearest 10Hz; switch the data polarity to the binary O state by connecting TP14 to TP9 and again measure the output frequency. Adjust RV2 and repeat this process until the difference between the two frequencies is as given in the TOTAL DEVIATION column in Table 1 for the appropriate transmitter channel spacing, with a tolerance of ±100Hz.
RPT 633 f) Increase the signal generator level by 20dB and re-adjust RV4 to give a deviation corresponding to that given in Table 2(b). g) Vary the signal generator frequency between 300Hz and 2.5kHz and check that the deviation does not exceed that given in Table 2(d). If it does, tune to the frequency that gives the maximum deviation and adjust RV4 to give a deviation corresponding to that given in Table 2(e). This should also be the larger of the Peak + or Peak - readings.
RPT 633 Table 3: Antenna Lengths CUT LENGTH mm FREQUENCY MHz 156 154 152 150 149 147 145 143 142 140 139 420 425 430 435 440 445 450 455 460 465 470 Figure 2: Antenna Cutting TM1184 Issue 1 Page 5 - 9
RPT 633 FAULT-FINDING WARNING GREAT CARE MUST BE TAKEN TO AVOID BREAKING OPEN THE ENCAPSULATION OF TR10 ON THE TRANSMITTER BOARD WHEN REPAIR OR COMPONENT REPLACEMENT IS BEING CARRIED OUT, AS THIS COMPONENT CONTAINS TOXIC BERYLLIUM OXIDE. 17. Table 4 shows the signals to be expected at the various test points as an aid to fault-finding. Table 4: Test Points T.P. Page 5 - 10 SIGNAL 1 Carrier Frequency 2 Tx Key (low-going) 3 PLL Control Voltage (nominally 5V) 4 VCO Frequency (div.
RPT 633 SECTION 6 SPARE PARTS LIST CONTENTS: 1. GENERAL 2. MODULES 3. 4. 5. 6. 7. 8. 9. 10. 11 12. 13. 14. TRANSMITTER BOARD COMPONENTS Capacitors Connectors Crystals Diodes Inductors Integrated Circuits Links Resistors Transducers Transformer Transistor Antenna 15. 16. BANDED COMPONENTS Filters Capacitors 17. 18. 19. 20. 21. 22.
RPT 633 ITEM/CIRCUIT REFERENCE 1. 2. DESCRIPTION PART NO. GENERAL INSERT MOULDING SCREENED 8-WAY INTER CONNECT FLEXFOIL MOULDING COVER CLAMPING PAD ADHESIVE NUT M3 ESCUTCHEON WASHER PLAIN M3 LABEL EQUIP. RUBBER FEET 23MM SCREW No. 6X16MM PAN HD POZI AB 0960-9887 4404-0001 0860-9846 1861-0225 1 9 6 6 3 2060-9878 20662 31600X7 33996 8204-0616 ASSY PCB VOX KEYING MODULE PSU 240V UK PLUG PSU 220V EURO PLUG PSU 110V 0260-7083 0301-0605 0301-0606 0301-0607 MODULES TRANSMITTER BOARD COMPONENTS 3.
RPT 633 ITEM/CIRCUIT REFERENCE 3. 4. C50,56,57 C51,89,113,132,133 C58 C59 C65 CAP CAP CAP CAP CAP CHIP 3p3 0.25p 50V CHIP 47p 5% 50V CHIP 6p8 0.25p 50V CHIP Op75 0.
RPT 633 ITEM/CIRCUIT REFERENCE 6. 8. 9. PART NO. Diodes (Continued) D6,7 D8 D9,10,11 7.
RPT 633 ITEM/CIRCUIT REFERENCE 10. DESCRIPTION PART NO. Resistors R1 R2,12,17,63 R3,52,96 R4,6,9,14,24,47,61,62,80,87 R5,7,8,64,73 RES RES RES RES RES CHIP CHIP CHIP CHIP CHIP 15k 5% 0.125W 2k2 5% 0.0625W 68R 5% 0.0625W 6k8 5% 0.0625W 33k 5% 0.0625W 3101-0174 3105-0179 3105-0143 3105-0191 3105-0207 R10,26,59,90 R11 R13 R15,45,86 R16,67,68,69,79,100 RES RES RES RES RES CHIP CHIP CHIP CHIP CHIP 560R 5% 0.0625W 22R 5% 0.0625W 3k3 5% 0.125W 15k 5% 0.0625W 10k 5% 0.
RPT 633 ITEM/CIRCUIT REFERENCE 10. 11. R102 R103,110,113,122 R105 R108 RES RES RES RES 820R 5% .0625W 10k 5% 0.0625W 1k8 5% 0.0625W 6k8 5% .0625W 3105-0169 3105-0195 3105-0177 3105-0191 R116 R118,120 TH1 RES CHIP 3k3 5% 0.0625W RES CHIP 150R 5% .0625W THERMISTOR 10k 3105-0183 3105-0151 3211-0002 RV1 RV2 RV3 RV4 POT POT POT POT 3202-0001 3208-0010 3208-0009 3202-0005 14.
RPT 633 ITEM/CIRCUIT REFERENCE DESCRIPTION PART NO. BANDED COMPONENTS 15. Filters FL1,2 FL1,2 FL1,2 16. FILTER HELICAL 252-MX-1547A BAND 1 FILTER HELICAL 252-MX-1549A BAND 2 FILTER HELICAL 252-MX-1551A BAND 3 4605-0005 4605-0006 4605-0007 CAP CER 10p 0.25p 63V BAND 1 CAP CER 10p 0.25p 63V BAND 2 CAP CER 8p2 0.25p 63V BAND 3 3302-0099 3302-0099 3302-0098 Capacitors C6 C6 C6 VOX KEYING MODULE COMPONENTS 17. Capacitors C1 C2,3,5,6,7 C4 C8 18.
RPT 633 ITEM/CIRCUIT REFERENCE 21. 22. DESCRIPTION PART NO. Resistors R1 R2 R3 R4 R5 R6 RES RES RES RES RES RES MF MF MF MF MF MF 39k 1% 0.6W 10k 1% 0.6W 680R 1% 0.6W 100k 1% 0.6W 1k5 1% 0.6W 47k 1% 0.
APPENDIX 1 UHF SERIAL ENCODER MODEL RPE 673 CONTENTS 1. INTRODUCTION 2. ROLE 3. PHYSICAL CONSTRUCTION 4. 5. SPECIFICATION Encoder Connectors 7. OPERATING INSTRUCTIONS 8. TECHNICAL DESCRIPTION PRE-INSTALLATION CHECKS 13. Unpacking 14. Tools required 15. Test Equipment required 16. 17. 24. 26. 30. 31. 35.
RPE 673 CONTENTS (Continued) 37. 39. 44. 46. 47. 48. 49. SERVICING Repair Policy Removal / Re-fitting of Circuit Boards Transmitter Alignment - Initial settings Setting up the Phase Lock Loop Transmitter Alignment Setting Data Deviation and Centre Frequency Setting Analogue Deviation 50. FAULT FINDING 51. ANTENNA CUTTING 52. SPARE PARTS LIST 1. 2. 3. 4. 5. 6.
INTRODUCTION 1. This Appendix outlines the installation and operation of the Radio Paging Serial Encoder (Transmitter/Encoder) model RPE 673. The Serial Encoder utilises the existing RPT 633 Transmitter PCB and, whenever necessary, reference is made to the appropriate section in the main body of this manual. ROLE 2. The Multitone RPE 673 is a single channel radio paging Serial Encoder operating in the UHF frequency band.
RPE 673 Connectors 5. 6.
TECHNICAL DESCRIPTION NOTE: For a circuit description of the Transmitter, refer to Section 3. 8. The RPE 673 Serial Encoder provides a communications link between any device with a standard RS232 data output and up to 10,000 paging receivers. Valid data is processed by a purpose built digital Encoder and fed to a 2.5W UHF Transmitter (based upon the RPT 633) for onward transmission. 9. The Encoder is driven by the serial RS232 data input (SK1 or SK2) and the eight DLC inputs (SK3 and SK5) using ESPA 4.
RPE 673 PRE-INSTALLATION CHECKS CAUTION STATIC SENSITIVE DEVICES ARE USED OBSERVE STATIC SAFETY PRECAUTIONS. WITHIN THIS EQUIPMENT. Unpacking 13. Unpack the container and examine the contents against the list given below: a) RPE 673 Serial Encoder Unit Qty 1 b) Power Supply Unit, 3-pin plug (UK) or 2-pin (Europe) Qty 1 c) Antenna Assembly * Qty 1 d) Socket, 2-way (4501-0001) Qty 2 * Supplied only when requested on Sales Specification Form Tools Required 14.
INSTALLATION PROCEDURE Wall Mounting CAUTION ENSURE THE UNIT IS MOUNTED IN A DRY ENVIRONMENT. DO NOT MOUNT THE UNIT OVER A HEAT SOURCE OR IN DIRECT SUNLIGHT. 16. The unit may be mounted on a suitable horizontal shelf or wall-mounted using the following procedure: a) Referring to Figure 2 (or using the template supplied with the Serial Encoder), drill holes to accept 8mm plugs and screws.
RPE 673 Software Configuration 17. To gain access to Encoder socket SK1, remove the two cross-point screws from the rear of the unit. Lift the cover slightly (it will only clear the base by 4 to 5 inches). Carefully disconnect the 8-way flexi-cable from PL1 of both Transmitter and Encoder. Pivoting on its front edge, invert the cover and slide it under the base. Fit test cable 4404-0003 to PL1 of Transmitter and Encoder. 18.
21. Definitions for each parameter are given in paragraph 24. 22. Once a setting has been selected, the following message will be displayed: ‘....Writing to Eeprom - please wait.....Done’ and the Set-up screen will again be displayed. 23. For Serial Port Settings however, parameters are not written to the Eeprom until ‘W’ (Write to Eeprom) is selected from the Serial Port Set-up Menu. Parameter Definitions 24.
RPE 673 Serial Protocol Options a) MEP: The only serial option for MEP protocol is the Timeout setting: Setting 0 1 2 3 NOTE: b) ESPA: Timeout 100 ms 1 second 2 seconds 3 seconds Setting 4 5 6 7 Timeout 4 seconds 5 seconds 6 seconds 7 seconds The Timeout settings are designed to allow flexibility in the response times from different external devices. There are two options:
Time-of-Day User Number This is a dummy User / Receiver which is used to allow the Time and/or Date to be set.
RPE 673 Connecting the External Device 26. Connection of the External Device to the RS232 port on the Encoder can be madenione of two ways: a) Connecting the P910 or P911 to Encoder SK1. b) Connecting an alternative cable to the Krone connections on Encoder SK2. 27. Note that Encoder SK1 and SK2 are connected in parallel; only one socket can be utilised. 28. Pin out details of Encoder sockets SK1 and SK2 are shown in Table 1.
Table 3 : P911 Connections 8 Way Modular Jack Plug 25 Way D-Type Connector Pin 1 Pin 7 Signal Ground Pin 2 Pin 3 Transmit Data Pin 3 Pin 2 Receive Data Pin 4 Pin 4 CTS Pin 5 Pin 6 N.C. Pin 6 Pin 5 RTS Pin 7 Pin 20 N.C. Pin 8 Pin 8 N.C. N.C.
RPE 673 Audio Connection 30. If required, the audio output from the External Device should be connected to Serial Encoder SK1 using the 2-Way Socket, Part No. 4501-0001 (provided) and suitable cable (RV1 on the Encoder PCB may be adjusted to compensate for the output level provided by the audio source at the customer’s premises). Direct Line Contacts (DLCs) 31. DLCs can be a door bell push, a security alarm, a sensor on a piece of machinery etc.
Figure 5: External Connections TM 1184 Issue 1 AL1 (May 1997) Page A1 - 15
RPE 673 TAG10830-1 Figure 6: Serial Encoder - Service Layout Page A1 - 16 TM 1184 Issue 1 AL1 (May 1997)
SERVICING Repair Policy 37. The following service policy applies to the RPE 673: a) The Encoder PCB and the Encoder firmware device (IC2) are disposable modules; both are available as service spares. b) The Transmitter PCB is repairable to component level (for part numbers, refer to Section 6). 38. Transmitter alignment procedures (paras 45 - 49) rely on the use of a PC for Transmitter keying. For alignment procedures without the use of a PC, refer to Section 5.
RPE 673 TL9 TP9 TL3 TL2 TL1 TL8 SK1 TP11 TP14 TP10 TP8 RV4 SK2 PL1 TP15 LK3 TL6 SK3 RV1 TP7 TP2 TL7 RV2 RV3 TP3 VC2 VC4 LK2 LK1 L1 VC5 VC1 VC3 TP12 TP13 TP14 TP1 TP5 FL2 TP6 FL1 PSG10532-1 Figure 7: Transmitter PCB Layout Page A1 - 18 TM 1184 Issue 1 AL1 (May 1997)
Transmitter Alignment - Initial Settings 44. Refer to Figure 7. Set the variable components and links as follows: VC1 VC2 VC3 VC4 VC5 - Anywhere. Half Meshed. Fully Un-meshed. Fully Un-meshed. 25% Meshed. FL1 and FL2 - Adjusters standing proud by 2mm. RV1 RV2 RV3 RV4 - Fully Anti-clockwise. Mid Position (15 turns from either end). Anywhere Mid Position LK1 - Position 2-3 (Normal Version). Position 1-2 (FTZ Version). LK2 - Position 1-2 (Bands 1 and 2). Position 2-3 (Band 3).
RPE 673 h) Power up the Serial Encoder, wait 3 seconds and, within a further 10 seconds, press on the Terminal keyboard; the Set-up / Test Menu should appear on the VDU (see Figure 8). j) Select (T)est Menu. NOTE: The Transmitter Tests are used to key the Transmitter during alignment, Full Test is for factory use only.
d) On FL1 and FL2 turn the four adjusters ½ turn at a time until the power meter indicates or the power supply current increases. e) If no power appears slightly adjust VC2 or VC3 and repeat (d). f) Tune the four adjusters of FL1 and FL2 for maximum power. g) Tune VC1, VC2 and VC3 for maximum power and then RV1 to give a power meter reading of 2.5W. h) Re-adjust VC1, VC2 and VC3 for maximum power then RV1 for 2.5W ±0.2W. Setting Data Deviation and Centre Frequency 48.
RPE 673 Setting Analogue Deviation 49. To set the Analogue Deviation carry out the following procedure: a) Select (A)nalogue from the Transmitter Test Menu. b) Set the audio generator output to 1.25kHz at a level of -13dBm (approximately 11.5mV peak-to-peak as measured on the oscilloscope). Monitor the deviation on the modulation meter. Adjust RV1 on the Encoder PCB fully clockwise. c) Refer to Table 6(a) and adjust the generator output level to give a deviation corresponding to the channel spacing.
FAULT FINDING 50. Specific fault finding information is not provided. For Transmitter test points, together with expected signals, refer to Section 5. NOTE: When the Serial Encoder is fitted with MEP firmware, it can be tested using CITEST.EXE (supplied with the Developers Pack D3NA). ANTENNA CUTTING 51. Refer to Section 5. 52. SPARE PARTS LIST NOTE: For General Spares and Transmitter PCB components, refer to Section 6. ITEM / CIRCUIT REFERENCE IC2 IC2 DESCRIPTION PART No.
RPE 673 Figure 9: Serial Encoder Interconnection Diagram Page A1 - 24 TM 1184 Issue 1 AL1 (May 1997)
