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BSR 113

TM1194A  Issue  B

Page 3 - 1

SECTION 3

TECHNICAL DESCRIPTION

CONTENTS:

 1.

INTRODUCTION

RADIO CIRCUITRY

 2.

Signal Input and Isolation

 3.

RF Amplifier and Filters

 4.

First Local Oscillator

 6.

First Mixer

 7.

Second Local Oscillator and Mixer

 8.

Second IF Stage

 9.

Audio Splitting

RX AUDIO PATH

10.

Filtering and Amplification

11.

Speaker Audio

12.

Line Out Driver

NOISE SQUELCH PATH

15.

Filtering and Amplification

18.

Schmitt Monostable

20.

Signal Logic Levels

21.

Signal Indication and Noise Squelch Defeat

22.

Signal Detect Reed Relay

23.

Signal Strength Tone Circuitry

26.

Tone Out Driver

SUB-AUDIO TONE PATH

29.

Filtering and Amplification

30.

Sub-Audio Tone Decoder

32.

Sub-Audio Tone Indication and Disable

33.

Sub-Audio Tone Squelch Delay Circuit

35.

DATA PATH

POWER SUPPLIES

36.

+12V Supply

37.

+10V Regulator

38.

+5V Regulator

39.

+1V Internal Reference

Содержание BSR 113

Страница 1: ...BSR 113 TM1194A Issue B Page i TECHNICAL MANUAL for UHF BASE STATION RECEIVER MODEL BSR 113 448MHz Printed and published in England...

Страница 2: ...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 Comments or correspo...

Страница 3: ...ontents 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 I...

Страница 4: ...9 B 5 9 B iv B 3 10 B 5 10 B v B 4 1 B 5 11 B vi B 4 2 B 5 12 B 1 1 B 4 3 B 5 13 B 1 2 B 4 4 B 5 14 B 1 3 B 4 5 B 6 1 B 1 4 B 4 6 B 6 2 B 1 5 B 4 7 B 6 3 B 1 6 B 4 8 B 6 4 B 2 1 B 4 9 B 6 5 B 2 2 B 4...

Страница 5: ...TAKEN WHEN DISPOSING OF THESE ITEMS SAFETY SUMMARY The following information applies to both operating and servicing personnel General Warnings and Cautions will be found throughout the manual where...

Страница 6: ...ESE 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 DIRECT CONNECTION OF THE BSR 113...

Страница 7: ..._______________________ INTRODUCTION 1 The Base Station Receiver model BSR 113 is an UHF double superheterodyne frequency modulated receiver operating on a specified frequency within the range 448MHz...

Страница 8: ...with volume control Ability to link with other receivers PHYSICAL CONSTRUCTION 3 The BSR 113 consists of a single Printed Circuit Board PCB mounted in a tough moulded plastic outer casing consisting o...

Страница 9: ...ency 1st LO x c 45MHz 6 f Sub Audio Tone Frequencies 88 5Hz 103 5Hz 114 8Hz 127 3Hz 141 3Hz g Sub Audio Tone Squelch To EIA standard RS 220 h Full System Deviation 5kHz for 20 25kHz channel spacing j...

Страница 10: ...e Power Supply 5 The power supply requirements of the BSR 113 are as follows a Power Supply 12V DC b Current Consumption 400mA maximum Connectors 6 The BSR 113 is fitted with the following connectors...

Страница 11: ...onment 8 The environmental characteristics of the BSR 113 are as follows a Operational Temperature Range 25 C to 55 C b Humidity Up to 95 Relative Humidity over the operational temperature range c Sta...

Страница 12: ...BSR 113 TM1194A Issue B Page 1 6 INTENTIONALLY BLANK...

Страница 13: ...STRUCTIONS CONTENTS 1 OPERATION _______________________ OPERATION 1 The BSR 113 is automatic in operation with the exception of the following a Switching on the power supply b Setting the volume contr...

Страница 14: ...BSR 113 TM1194A Issue B Page 2 2 INTENTIONALLY BLANK...

Страница 15: ...11 Speaker Audio 12 Line Out Driver NOISE SQUELCH PATH 15 Filtering and Amplification 18 Schmitt Monostable 20 Signal Logic Levels 21 Signal Indication and Noise Squelch Defeat 22 Signal Detect Reed...

Страница 16: ...gnal is then fed to the first RF helical filter FL11 which protects the RF amplifier from strong out of band signals RF Amplifier and Filters 3 Impedance matching is provided by L15 L16 and associated...

Страница 17: ...BSR 113 TM1194A Issue B Page 3 3 Figure 1 Functional Block Diagram...

Страница 18: ...ed by R31 Second IF Stage 8 The second IF chain comprises three ceramic filters of channel bandwidth FL5 FL6 and FL4 each followed by an IF amplifier After FL5 the 455kHz IF signal is amplified by the...

Страница 19: ...or IC10 to prevent any damage to the chip resulting from over dissipation Line Out Driver 12 The Rx Audio output from IC11 pin 14 is also fed via the audio gate TR23 and RV6 to the Line Out driver amp...

Страница 20: ...n with special care being taken of temperature performance The rectified signal is smoothed by C167 Schmitt Monostable 18 The following stage comprising TR45 TR46 TR47 TR48 TR49 and TR50 is configured...

Страница 21: ...sed to IC2 pin 5 which acts as a Voltage Controlled Oscillator VCO running at approximately 12kHz The frequency of the output pin 3 is dependent on the DC level of the input pin 5 A higher level of in...

Страница 22: ...plification 29 From the active filter TR24 the Sub Audio signal is fed through two stages of low pass filtering provided by IC9 pin 1 and IC9 pin 7 The signal then passes through two stages of amplifi...

Страница 23: ...ausing C288 to discharge slowly through R140 This signal rectification means that a high on the base of TR19 produces a long pulse through TR21 and the NAND gate TR22 which switches off the squelch si...

Страница 24: ...ut to 10V which is then passed to the rest of the circuitry 5V Regulator 38 Voltage regulator IC5 converts its 12V regulated input to 5V which is then passed to the rest of the circuitry Indication of...

Страница 25: ...of Link Settings 4 6 2 Line Out Tone Out Termination Loading Link Settings 4 8 3 Pin Descriptions 4 9 FIGURES 1 Wall Mounting Hole Positions 4 3 2 Single BSR 113 Configuration 4 4 3 Multiple BSR 113...

Страница 26: ...ip on a flat surface suitable for shelf mounting Wall Mounting 4 To wall mount the BSR 113 proceed as follows a Referring to Figure 1 mark drill and plug the four fixing holes b Remove the four rubber...

Страница 27: ...506 BNC connector SK7 situated at the rear of the BSR 113 Alternatively fit the BNC N type coaxial cable for an extended antenna No external braid breaker is required as it is built in the unit Audio...

Страница 28: ...anual for the system bus details b Multiple Receiver Configuration A multiple receiver configuration uses the Voting method of receiver selection A maximum of eight BSRs can be connected to a P317 Vot...

Страница 29: ...K7 SK3 SK2 BSR 113 PSU AE SK7 SK3 SK2 BSR 113 PSU AE SK7 SK3 P317 VOTING UNIT P317 VOTING UNIT PSU PSU CONTROL UNIT CONTROL UNIT AUDIO TONE AUDIO SYSTEM BUS ACCESS 1000 OR ACCESS 3000 RECEIVERS 5 TO 8...

Страница 30: ...TURE APPLICATIONS OUT RX AUDIO HIGH PASS FILTER STAGE OPERATIVE 5 IN NORMAL OPERATION OUT FACTORY TEST PURPOSES ONLY 6 7 19 20 REFER TO TABLE 2 TONE OUT TERMINATION LOADING FOR NATIONAL PTO LINES 8 9...

Страница 31: ...es provided by a Public Telephone Operator PTO This allows the audio signals to be passed from a remote BSR 113 to the local system via the external lines The system must be connected to the PTO lines...

Страница 32: ...Termination Loading Link Settings COUNTRY LK22 LK6 LK23 LK7 LK24 LK19 LK25 LK20 UNITED KINGDOM 1 2 OUT OUT IN GERMANY 1 2 IN OUT OUT AUSTRIA 1 2 IN OUT OUT BELGIUM 1 2 IN OUT OUT SPAIN 1 2 IN OUT OUT...

Страница 33: ...on the PSU and setting the volume control RV4 located at the rear of the unit to the required level Table 3 Pin Descriptions PIN NUMBER SK2 SK3 SK1 SK7 AUDIO TONE DC AUXILIARY ANTENNA OUT POWER 1 Tone...

Страница 34: ...8 7 6 5 4 3 2 1 PIN VIEWED FROM NON CLIP SIDE CLIP ON OTHER SIDE TAG 10493 1 BSR 113 TM1194A Issue B Page 4 10 Figure 6 8 Way Modular Plug FCC68 Type Pin Configuration...

Страница 35: ...OCEDURES 9 Receiver and Noise Squelch Alignment 10 Sub Audio Tone Alignment 11 Signal Strength Tone Alignment 12 Line Out Level Alignment 13 FAULT FINDING 15 EXTERNAL LINE TESTING TABLE Page 1 Test Si...

Страница 36: ...OULD BE STORED IN ANTI STATIC PACKAGING WHEN NOT INSTALLED IN THE EQUIPMENT WARNING ROUTINE MAINTENANCE 1 Routine maintenance is limited to surface cleaning of the receiver using a lint free cloth moi...

Страница 37: ...he servicing procedures Surface Mount Handling Tools Anti static Workstation Modular Test Plug Cable NOTE Use an 8 way modular plug FCC68 type single ended cable Part No 0301 0092 as the Modular Test...

Страница 38: ...he BSR 113 in the same order as shown Check the 10V and 5V power supplies before proceeding The 5V power supply is also indicated by the illumination of LED D23 Refer to Table 1 for the test signals N...

Страница 39: ...ND b Set the signal generator to a signal of 13dBm at the on channel frequency modulated with 1kHz at a deviation of 3kHz NOTE If the SINAD meter is used for generating the external 1kHz set the corre...

Страница 40: ...e the RF level from the signal generator to maintain about 12dB SINAD iii Repeat I and ii for the second slug of FL11 j FL8 I Adjust the first slug of FL8 for best SINAD Ensure that the best tuning po...

Страница 41: ...dB above the level required for 12dB SINAD q Reduce the volume control for the SINAD meter loudspeaker to zero Increase the BSR output volume control for a comfortable listening level r If fitted remo...

Страница 42: ...quelch defeat This should cause audio to be emitted from the speaker and LEDs D11 and D22 should light Adjust RV4 situated on the rear of the unit to an acceptable level b Set the frequency counter to...

Страница 43: ...ve LK10 b With the signal generator connected to SK7 apply a signal of 126dBm at the on channel frequency modulated with 1kHz at a deviation of 3kHz c Connect the oscilloscope and frequency counter ac...

Страница 44: ...scope e Restore LK10 LK14 and LK3 to their original positions NOTE The Tone Out level does not require alignment FAULT FINDING 13 Ensure that the power supply to the receiver is switched on and refer...

Страница 45: ...t Connected Not Connected Not Connected Not Connected Vcc PNP BASE 1V POT GND DATA OUT DATA IN DISCRIMINATOR OUT QUADRATURE LC IN IC1 NOTE NOT TO SCALE ALL ICs VIEWED FROM ABOVE UNLESS STATED OTHERWIS...

Страница 46: ...8 1 1 2 3 1 OUTPUT 2 GROUND 3 INPUT IC4 IC5 View from below OUTPUT FILTER OUT GND TIMING CAPACITOR TIMING RESISTOR LOOP FILTER IN Vs OUTPUT 1 INPUT 1 INPUT 1 INPUT 2 INPUT 2 SUPPLY VOLTAGE OUTPUT 2 GN...

Страница 47: ...ALL TRANSISTORS TAG 10927 1 BSR 113 TM1194A Issue B Page 5 13 Figure 6 Transistor Pin Configuration...

Страница 48: ...BSR 113 TM1194A Issue B Page 5 14 INTENTIONALLY BLANK...

Страница 49: ...RTS LIST CONTENTS 1 GENERAL 2 LABELS PRINTED CIRCUIT BOARD COMPONENTS 3 Capacitors 4 Crystals 5 Diodes 6 Filters 7 Fuse 8 Gas Arresters 9 Inductors 10 Integrated Circuits 11 Relay 12 Resistors 13 Tran...

Страница 50: ...p 5 50v 3326 0016 C10 48 56 60 67 71 84 85 86 87 88 120 145 149 152 156 160 165 167 168 248 269 270 278 281 284 CAP CHIP 1 0 20 80 16V 3301 0277 C13 75 78 79 264 265 266 272 275 299 300 CAP CHIP 1n0 1...

Страница 51: ...CHIP 1n5 1 50V 3307 0006 C158 159 161 CAP CHIP 220p 5 50V 3301 0045 C226 CAP AL 100 20 35V 3403 0029 C228 236 298 CAP AL 10 20 35V 3401 0100 C231 232 CAP AL 470 20 16V 3403 0032 C239 242 CAP POLYTR 2...

Страница 52: ...117 0012 L8 IND CHIP 220n 5 4103 0262 L9 13 IND CHIP 27n 5 4103 0247 L10 11 12 IND CHIP 680n 5 4103 0274 L14 16 IND CHIP 22n 10 4117 0014 L17 18 IND RF CHOKE 1 4102 0007 L19 20 IND COIL 1 29747 10 Int...

Страница 53: ...27 99 105 113 114 120 121 315 RES CHIP 560R 5 0 0625W 3105 0165 R28 158 345 RES CHIP 150k 5 0 0625W 3105 0223 R30 32 45 66 91 92 RES CHIP 100R 5 0 0625W 3115 0050 R42 111 115 118 124 131 138 142 143 1...

Страница 54: ...ES CHIP 47k 5 0 0625W 3105 0211 R395 RES CHIP 1k8 5 0 0625W 3105 0177 R402 404 RES CHIP 270R 5 0 0625W 3115 0060 RV1 3 6 RES VAR 10k 3201 0010 RV2 RES VAR 10k PRESET MULTI TRN 3208 0010 RV4 RES VAR 10...

Страница 55: ...rcuit Diagram Sheet 1 of 4 2961 3795B Iss 3 7 3 4 Sheet 1 2 Circuit Diagram Sheet 2 of 4 2961 3795B Iss 3 7 5 6 Sheet 4 3 Circuit Diagram Sheet 3 of 4 2961 3795B Iss 3 7 7 8 Sheet 2 4 Circuit Diagram...

Страница 56: ...BSR 113 Page 7 2 TM1194A Issue B INTENTIONALLY BLANK...

Страница 57: ...TM1194A Issue B Figure 1 Circuit Diagram Sheet 1 of 4 Page 7 3 4...

Страница 58: ...TM1194A Issue B Figure 2 Circuit Diagram Sheet 2 of 4 Page 7 5 6...

Страница 59: ...TM1194A Issue B Figure 3 Circuit Diagram Sheet 3 of 4 Page 7 7 8...

Страница 60: ...TM1194A Issue B Figure 4 Circuit Diagram Sheet 4 of 4 Page 7 9 10...

Страница 61: ...TM1194A Issue B Figure 5 Component Layout Diagram Page 7 11...

Страница 62: ...STATION RECEIVER TM1194A BSR113 BASE STATION RECEIVER TM1194A BSR113 BASE STATION RECEIVER TM1194A BSR113 BASE STATION RECEIVER TM1194A BSR113 BASE STATION RECEIVER TM1194A BSR113 BASE STATION RECEIV...

Страница 63: ...13 BSR113 BASE STATION RECEIVER BASE STATION RECEIVER BASE STATION RECEIVER TM1194A TM1194A TM1194A BSR113 BSR113 BSR113 BASE STATION RECEIVER BASE STATION RECEIVER BASE STATION RECEIVER TM1194A TM119...

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