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Tait T860 Series II, Service Manual

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Tait T860 Series II Service Manual Download Page 34

B2.4

T865 Circuit Operation

M860-00-Preliminary

30/06/98

Copyright TEL

2.2

Receiver Front End

(Refer to the front end, IF section and audio processor circuit diagrams (sheets 4, 3 and 2
respectively) in Section 6.)

Figure 2.2   T865 Front End, IF and Mute Block Diagram

The incoming signal from the N-type antenna socket is fed through a 7-pole, low pass
filter with a cut frequency of approximately 305MHz.  This low loss filter (typically less
than 0.5dB insertion loss over 220-270MHz) provides excellent immunity to interference
from high frequency signals.

The signal is then further filtered, using a notched doublet (L410, L420) which provides
exceptional image rejection, before being amplified by approximately 12dB (Q420).  The
signal is then passed through a further doublet (L460, L470) before being presented to
the mixer.

Each sub-block within the front end has been designed with 50 ohm terminations for
ease of testing and fault finding.  

t

∆

Mixer

2-Pole

Crystal

Filter

Buffer

Amp

RSSI

Comparator

RF In

220-270MHz

Harmonic

Filter

Doublet

Filter

Doublet

Filter

RF

Amp

Local Oscillator

(From Synthesiser)

Diplexer

Post

Mixer

Amp

4-Pole

Crystal

Filter

IF

Amp

2dB Pad

21.4MHz

Mixer

(NE612)

Ceramic

Filter

IF

Amp

Limiter

(NE614)

FM

Detector
(NE614)

Low

Pass
Filter

21.4MHz

455kHz

2nd LO
20.945MHz

Amp

Active

Filter

LF

Amp

Diode

Detector

Smoothing

Filter

Gain
Adjust

Noise
Mute
Adjust

Gating

Delays

Comparator

Comparator

Carrier
Mute
Adjust

Carrier Mute

Noise Mute

Buffer Amp

Rx Gate Out
(To Audio
Processor)

Audio Section

Link:

RSSI Output
Voltage
(To D-Range
Socket)

Audio
(To Audio
Processor)

Summary of Contents for T860 Series II

Page 1: ...M860 00 Preliminary 1 Copyright TEL 30 06 98 T860 Series II Base Station Equipment 220 285MHz Preliminary Service Manual July 1998 M860 00 PRELIM...

Page 2: ...Fax 33 1 41 14 05 55 Germany Tait Mobilfunk GmbH Willst tterstra e 50 D 90449 N rnberg 60 Germany Phone 49 911 96 746 0 Fax 49 911 96 746 79 Hong Kong Tait Mobile Radio HK Ltd Room 703A New East Ocean...

Page 3: ...anual is the property of Tait Electronics Ltd All rights are reserved This manual may not in whole or part be copied photocopied reproduced translated stored or reduced to any electronic medium or mac...

Page 4: ...x parts as listed below with each part being further sub divided into sections There is a detailed table of contents at the start of each part and or section Part Title A Introduction To Servicing B T...

Page 5: ...2 2 2 1 2 2 2 3 2 3 1 2 3 2 2 4 Mechanical Torx Recess Head Screws Pozidriv Philips Recess Head Screws Disassembly Reassembly Receivers Exciters Power Amplifiers Cover Screw Torques 2 1 2 1 2 2 2 3 2...

Page 6: ...AII M860 00 Preliminary 30 06 98 Copyright TEL...

Page 7: ...ote the full PCB internal part number IPN which is screen printed onto the top side of the board refer to the appropriate PCB Information section in this manual for more details 1 2 Caution CMOS Devic...

Page 8: ...ge to the transmitter output power stage 1 4 Caution Beryllium Oxide Power Transistors The RF power transistors in current use all contain some beryllium oxide This sub stance while perfectly harmless...

Page 9: ...rew head damage caused by the driver tip rotating within the recess In addition using a ball tip Torx screwdriver allows you to drive a Torx head screw with the driver on a slight angle which can be u...

Page 10: ...n result in considerable damage to the screw head if the screwdriver tip turns inside the recess Note If you find you need excessive downwards pressure to keep the screwdriver tip in the Pozidriv scre...

Page 11: ...ront panel handle and on the opposite side to the main D range connector D range 1 PL100 You need to remove the bottom cover to access SMD components change solder blob links fit test leads to circuit...

Page 12: ...A2 4 Mechanical M860 00 Preliminary 30 06 98 Copyright TEL...

Page 13: ...continue the movement until 3 or 4 circles have been com pleted Remove the tip while continuing suction to ensure that all solder is removed from the joint then stop the suction Before pulling the le...

Page 14: ...an approved Tait Dealer or Subsidiary equipped with the necessary facilities Repairs attempted with incorrect equipment or by untrained personnel may result in permanent damage If in doubt contact yo...

Page 15: ...ined modules can be created however allowing variation from the standard library module Channel numbers default to 0 127 to match the EPROM memory locations How ever the user can change this setting s...

Page 16: ...on that is not stored in the radio but which is still relevant to the radio can be saved to a file on disk e g note field auxiliary pin names etc Note The data files produced by BASEPROG V1 0 all DOS...

Page 17: ...part of the manual is divided into six sections as listed below There is a detailed table of contents at the start of each section Section Title 1 General Information 2 Circuit Operation 3 Initial Tu...

Page 18: ...BII M860 00 Preliminary 30 06 98 Copyright TEL...

Page 19: ...ion Section Title Page 1 1 Introduction 1 3 1 2 1 2 1 1 2 2 1 2 3 1 2 4 1 2 4 1 1 2 4 2 1 2 4 3 1 2 5 1 2 6 1 2 6 1 1 2 6 2 1 2 6 3 Specifications Introduction General RF Section Audio Section General...

Page 20: ...B1 2 T865 General Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 21: ...n be adjusted to deliver 10dBm to a 600 ohm balanced output and 1W to a local monitor speaker A flat or de emphasised audio response is link selectable The synthesiser frequency is programmed via the...

Page 22: ...standards Details of test methods and the conditions which apply for Type Approval testing in all countries can be obtained from Tait Electronics Ltd The terms wide bandwidth mid bandwidth and narrow...

Page 23: ...l applications Signal Strength Indicator 115dBm to 70dBm 3 5 to 6 5V at approx 15dB V IF Amplifiers Frequencies 21 4MHz and 455kHz Bandwidths Narrow Bandwidth NB 7 5kHz Mid Bandwidth MB 12kHz Wide Ban...

Page 24: ...80dB CEPT typical Mid Bandwidth 80dB CEPT Wide Bandwidth 85dB EIA Blocking 100dB Co channel Rejection 6dB Amplitude Characteristic 3dB Spurious Emissions Conducted 90dBm to 4GHz Radiated 57dBm to 1GH...

Page 25: ...350 to 3400Hz Response within 1 3dB of level at 1kHz Hum And Noise 30dB min at 250 3Hz 1kHz at 60 system deviation 35dB typical 67 to 240Hz CTCSS at 10 system deviation Tone Detect Tone Squelch Openin...

Page 26: ...ipment and systems land mobile service technical characteristics and test conditions for radio equipment with an internal or external RF connector intended pri marily for analogue speech ETS 300 113 M...

Page 27: ...r radio equipment in the land mobile service intended primarily for analogue speech Annex II 1988 Technical characteristics of radio equipment in the land mobile service with regard to quality and sta...

Page 28: ...asic function of the product as follows T86X XX XXXX T865 receiver T867 exciter T869 100W power amplifier Type The Type group uses two digits to indicate the basic RF configuration of the product The...

Page 29: ...eiver type by checking the placement of an SMD resistor in the table that is screen printed onto the PCB refer to Section 6 1 for more details a Selectable by solder links refer to Section 3 7 b A TCX...

Page 30: ...B1 12 T865 General Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 31: ...and diagrams for the VCO PCB are in Part E The following topics are covered in this section Section Title Page 2 1 Introduction 2 3 2 2 Receiver Front End 2 4 2 3 Mixer 2 5 2 4 IF Circuitry 2 5 2 5 N...

Page 32: ...B2 2 T865 Circuit Operation M860 00 Preliminary 30 06 98 Copyright TEL...

Page 33: ...oscillator IF audio processor mute squelch regulator circuits received signal strength indicator RSSI These stages are clearly identifiable in Figure 2 1 Refer to the circuit diagrams in Sec tion 6 fo...

Page 34: ...ed by approximately 12dB Q420 The signal is then passed through a further doublet L460 L470 before being presented to the mixer Each sub block within the front end has been designed with 50 ohm termin...

Page 35: ...he mixer are made up for in a tuned common gate post mixer amplifier Q310 Several stages of amplification and filtering are employed in the IF circuitry The first crystal filter is a 4 pole device XF3...

Page 36: ...ntroduced by the feedback resistor R267 to prevent the received message from being chopped when the average noise voltage is close to the threshold R281 and R280 determine the mute opening and closing...

Page 37: ...of IC260 is fed into a line trans former to provide a balanced 2 wire or 4 wire 600 ohm output The speaker volume is set using the front panel Monitor Volume knob RV205 and the line level is set using...

Page 38: ...e off a 10 8 16V DC supply 13 8V nominal A 5 3V regu lator IC630 runs directly from the 13 8V rail driving much of the synthesiser circuitry It is also used as the reference for a DC amplifier IC640 Q...

Page 39: ...it EEPROM IC820 This serial bus is also used by the microcontroller to program the synthesiser IC740 The main tasks of the microcontroller are as follows program the synthesiser interface with the PGM...

Page 40: ...and programmable divider which is incorporated into the synthesiser chip IC740 This signal is compared with the reference signal at the phase detector also part of the synthesiser chip The phase detec...

Page 41: ...f is taken from the input to Q5 and used to drive the divider buffer for the synthesiser IC740 The VCO operates at the actual frequency required by the first mixer i e there are no multiplier stages T...

Page 42: ...B2 12 T865 Circuit Operation M860 00 Preliminary 30 06 98 Copyright TEL...

Page 43: ...to Section 6 where the parts lists grid reference index and diagrams will provide detailed information on identifying and locating components and test points on the main PCB The parts list and diagram...

Page 44: ...rier Level Mute 3 12 3 11 3 11 1 3 11 2 Audio Processor Line Amplifier Output Monitor Amplifier Output Speaker Output 3 13 3 13 3 13 3 12 RSSI 3 13 Figure Title Page 3 1 3 2 T865 Test Equipment Set up...

Page 45: ...ing the PGM800Win software package and an IBM PC You can also use PGM800Win to select the receiver s current operating frequency or default channel If the receiver is installed in a rack frame you can...

Page 46: ...or Short Tuning Procedure Figure 3 2 T865 Test Equipment Set up For Full Tuning Adjustment Procedure or RF test set optional not needed for short tuning procedure Receiver RF In RF Signal Generator Au...

Page 47: ...l Tune VCO trimmer CT for a synthesiser loop voltage of 8V Multichannel Tune VCO trimmer CT for a synthesiser loop voltage of 8V on the middle channel If there is no middle channel tune CT so that the...

Page 48: ...ensitivity fully anticlockwise Adjust RV330 noise mute gain to close the mute if necessary turn off the RF sig nal and then turn it on again Rotate RV330 anticlockwise until the mute just opens Adjust...

Page 49: ...ed Align the receiver as instructed in Section 3 6 and Section 3 7 Apply an on channel signal from the RF generator at a level of 100dBm with 3kHz deviation 2 4kHz 1 5kHz at 1kHz Adjust RV320 RSSI lev...

Page 50: ...brackets Refer to Section 3 5 2 for further details Plug Link Function PL210 1 2 2 3 de emphasised response flat response PL220 1 2 2 3 flat response de emphasised response PL230 1 2 2 3 3 4 audio inp...

Page 51: ...noise 45dB high pass filtered speech 400Hz to 3kHz internal CTCSS detection hum noise 30dB with 250 3Hz tone present external CTCSS detection decoding performed through the receiver but externally spe...

Page 52: ...tion 3 7 3 7 Alignment Of Receiver Front End And IF Note 1 In this and following sections deviation settings are given first for wide bandwidth sets followed by settings in brackets for mid bandwidth...

Page 53: ...r to Section 3 5 Readjust IF coils L330 L340 L350 CV318 and quad coil L360 to give a maximum amplitude response on the oscilloscope with minimal amplitude modulation Note If you would like a more accu...

Page 54: ...gain to close the mute if necessary turn off the RF sig nal and then turn it on again Rotate RV330 anticlockwise until the mute just opens Once the mute has been set up as described above adjust RV23...

Page 55: ...o the required output level 3 11 2 Monitor Amplifier Output Speaker Output Adjust RV205 front panel monitor volume to give an output of 2V rms into a 4 ohm resistive load Check for any clipping or dis...

Page 56: ...B3 14 T865 Initial Tuning Adjustment M860 00 Preliminary 30 06 98 Copyright TEL...

Page 57: ...so to Section 6 where the parts lists grid reference index and diagrams will provide detailed information on identify ing and locating components and test points on the main PCB The parts list and dia...

Page 58: ...B4 2 T865 Functional Testing M860 00 Preliminary 30 06 98 Copyright TEL...

Page 59: ...A Reset the front panel controls to the required settings 4 2 Sensitivity If CTCSS is enabled disable the CTCSS tone by either programming the T865 for No Tone on the set channel or by pulling pin 10...

Page 60: ...tor volume to give 2V rms into a 4 ohm resistive load Check that the distortion at the monitor output is better than 2 THD Reset the controls before proceeding to the next set of tests 4 5 Ultimate Si...

Page 61: ...hasised Audio Frequency Response Wide Bandwidth Narrow Bandwidth 25 20 Audio Level dB ref to O P 1kHz 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 100 200 300 500 1k 2k 3k 5k 10k Frequency Hz 25 C 13 8V...

Page 62: ...to give the required opening sinad Note False opening of the mute can occur if the RF generator s attenuator is noisy when the level is being changed 4 8 RSSI Apply an on channel signal from the RF ge...

Page 63: ...set channel using PGM800Win Set the RF signal generator output to 70dBm Modulate the generator with a 1kHz tone at 3kHz deviation 2 4kHz 1 5kHz a CTCSS tone at the programmed frequency at 500Hz devia...

Page 64: ...nerator output to 70dBm and note the line level measure ment A Reduce the 1kHz generator to zero output and measure the line level again meas urement B Check that measurement B is at least 30dB below...

Page 65: ...in brackets for mid bandwidth sets and narrow bandwidth sets Note 2 Unless otherwise specified the term PGM800Win used in this and follow ing sections refers to version 2 00 and later of the software...

Page 66: ...6 5 7 7 Fault Finding Charts Microcontroller Basic Checks Serial Communication CTCSS Decode Regulator Synthesiser Noise Mute Carrier Mute Receiver Audio 5 9 5 9 5 9 5 10 5 11 5 12 5 13 5 16 5 17 5 18...

Page 67: ...multi junction transistors is a further guide to their per formance If an IC is suspect the most reliable check is to measure the DC operating voltages Due to the catastrophic nature of most IC failur...

Page 68: ...ntrol voltage at PL4 1 or the junction of C35 R30 on the VCO PCB If the synthesiser is locked and the VCO aligned the voltage at this point should be between 5 and 13V If the VCO is not locked refer t...

Page 69: ...3 7 Check that the 12dB sinad sensitivity into the front end is as follows 117dBm de emphasised response 111dBm flat response If the sensitivity is poor you can trace the fault by measuring the sensit...

Page 70: ...ntaining a low level unmodulated RF input to the receiver loosely cou ple into the second IF an additional high level signal at 455kHz you should now hear a constant low frequency beat note Adjust the...

Page 71: ...Y input to monitor the RSSI output voltage at TP310 RSSI test point or pin 5 of D range 1 PL100 This will give a demodulated log response and only the top half of the wave forms shown in Figure 5 2 a...

Page 72: ...nel is selected externally Try turning the external channel switch off before changing the default channel in PGM800Win Synth Out Of Lock The synthesiser received incorrect data or the data was corru...

Page 73: ...g Check state of pin 35 Y Is pin 30 pulsing High or open circuit Y Static high low Check state of pins 36 to 43 Low floating High Is the 12 8MHz clock present on IC810 pin 21 microcontroller N Replace...

Page 74: ...the radio Check the transistor interface circuitry and or replace the programming lead Check the SERIAL COM and AUDIO 1 2 links Replace IC810 Check the transistor interface circuitry and or replace th...

Page 75: ...aves at the CTCSS frequency Y Check IC850 pins 1 14 Are there 9V square waves at the CTCSS frequency Replace IC850 Y Is IC850 pin 7 low and Q845 collector high Replace IC850 or Q845 N Y Is IC810 pin 3...

Page 76: ...rcuits 13 8V present on IC630 pin 3 5 3V present on IC630 pin 1 9 0V present on TP202 Check Q620 Q630 IC640 20V present on TP701 Check Q660 is switching at approx 180kHz 5V present on IC610 pin 2 Repl...

Page 77: ...lace VCO Replace if faulty Y N N N N Y Y Check biasing resistors Q1 DC V present on Q795 emitter Check 9V supply 9V present on Q795 divider buffer 20V inverter supply faulty 20V present on IC750 pin 8...

Page 78: ...the VCO trimmer is adjusted out of lock Check VCO Y Y Y Signal Y Y Y No signal Replace synthesiser IC740 Y N Y Y N N N N Check phase detector output pins IC740 pins 3 4 Are there very narrow pulses 50...

Page 79: ...M Correct DC V present on Q1 VCO Change trimmer still noisy Change Q1 still noisy Change TCXO still noisy Change varactors still noisy Replace VCO assembly Synthesiser OK N N N N Check inductors biasi...

Page 80: ...Mutable audio on outputs Y Voltage varies 0 2 5V N OK Does Gate LED toggle on off N Check Q230 Q245 Q290 for operation Y Adjust RV230 gating sensitivity observe voltage on IC270 pin 3 Set RF signal le...

Page 81: ...et RF signal level to 95dBm Rotate RV235 c w cc w Monitor voltage on IC280 pin 7 Switching 0 8V as RV235 rotated Replace IC280 N Y Monitor voltage on IC270 pin 7 Switching 0 8V as RV235 rotated Check...

Page 82: ...330 input OK Fault in IC350 XF340 IC340 XF330 or surrounding circuitry Check replace Inject 21 4MHz after mixer IF output T B Measure distortion OK Inject on channel RF into mixer T B Measure distorti...

Page 83: ...ing sensitivity fully clockwise Gate LED on Refer to mute fault finding charts Y N N Y N Y N Y Audio on speaker Audio on C238 C259 Audio on IC240 pin 2 IC260 pin 2 Replace C249 check continuity Audio...

Page 84: ...B5 20 T865 Fault Finding M860 00 Preliminary 30 06 98 Copyright TEL...

Page 85: ...ormation B6 1 Copyright TEL 30 06 98 6 T865 PCB Information This section provides the following information on the T865 receiver parts lists grid reference index PCB layouts test points options connec...

Page 86: ...B6 2 T865 PCB Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 87: ...XX Note The only function of this resistor is to indicate the product type It has no effect on the circuitry or operation of the receiver PCB Identification All PCBs are identified by a unique 10 digi...

Page 88: ...ts A variant component is one that has the same circuit reference but different value or specification in different product types Where two products share the same PCB the term variant is also used to...

Page 89: ...circuit diagram grid references are useful in following a circuit that is spread over two or more sheets When a line representing part of the circuitry is discontinued a reference will be given at the...

Page 90: ...B6 6 T865 PCB Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 91: ...C211 015 24470 08 CAP CER 0805 4N7 10 X7R 50V C213 015 25470 08 CAP CER 0805 47N 10 X7R 50V C215 015 21220 05 CAP CER0805 2P2 0 1 200VGRM40 C217 015 22470 01 CAP CER 0805 47P 5 NPO 50V C219 015 24470...

Page 92: ...25100 08 CAP CER 0805 10N 10 X7R 50V C759 015 25100 08 CAP CER 0805 10N 10 X7R 50V C761 015 25100 08 CAP CER 0805 10N 10 X7R 50V C762 014 08220 01 L CAP TANT 22UF10V276MSER C764 015 25100 08 CAP CER 0...

Page 93: ...6 15470 00 RES M F 0805 47K 5 R238 036 11470 00 RES M F 0805 4E7 10 R239 036 14100 10 RES M F 0805 CHIP 1K 1 R241 036 14100 10 RES M F 0805 CHIP 1K 1 R242 036 13100 00 RES M F 0805 100E 5 R244 036 146...

Page 94: ...M F 0805 47K 5 R816 036 16150 00 RES M F 0805 150K 5 R818 036 14470 00 RES M F 0805 4K7 5 R819 036 14470 00 RES M F 0805 4K7 5 R820 036 15470 00 RES M F 0805 47K 5 R821 036 15470 00 RES M F 0805 47K 5...

Page 95: ...C211 015 24470 08 CAP CER 0805 4N7 10 X7R 50V C213 015 25470 08 CAP CER 0805 47N 10 X7R 50V C215 015 21220 05 CAP CER0805 2P2 0 1 200VGRM40 C217 015 22470 01 CAP CER 0805 47P 5 NPO 50V C219 015 24470...

Page 96: ...CAP CER 0805 10N 10 X7R 50V C761 015 25100 08 CAP CER 0805 10N 10 X7R 50V C762 014 08220 01 L CAP TANT 22UF10V276MSER C764 015 25100 08 CAP CER 0805 10N 10 X7R 50V C765 014 07470 00 CAP TANT CHIP 4U7...

Page 97: ...245 036 14100 10 RES M F 0805 CHIP 1K 1 R247 036 14220 00 RES M F 0805 2K2 5 R249 036 15100 10 RES M F 0805 10K 1 R251 036 15390 00 RES M F 0805 39K 5 R252 036 14470 00 RES M F 0805 4K7 5 R254 036 148...

Page 98: ...F 0805 47K 5 R823 036 15470 00 RES M F 0805 47K 5 R824 036 14220 00 RES M F 0805 2K2 5 R825 036 14220 00 RES M F 0805 2K2 5 R826 036 14220 00 RES M F 0805 2K2 5 R827 036 14220 00 RES M F 0805 2K2 5 R...

Page 99: ...100 04 CAP ELE RA 10M 16V 4X7MM C231 020 08100 04 CAP ELE RA 10M 16V 4X7MM C233 020 08100 04 CAP ELE RA 10M 16V 4X7MM C235 015 24100 08 CAP CER 0805 1N 10 X7R 50V C237 015 24100 08 CAP CER 0805 1N 10...

Page 100: ...25100 08 CAP CER 0805 10N 10 X7R 50V C761 015 25100 08 CAP CER 0805 10N 10 X7R 50V C762 014 08220 01 L CAP TANT 22UF10V276MSER C764 015 25100 08 CAP CER 0805 10N 10 X7R 50V C765 014 07470 00 CAP TANT...

Page 101: ...245 036 14100 10 RES M F 0805 CHIP 1K 1 R247 036 14220 00 RES M F 0805 2K2 5 R249 036 15100 10 RES M F 0805 10K 1 R251 036 15390 00 RES M F 0805 39K 5 R252 036 14470 00 RES M F 0805 4K7 5 R254 036 148...

Page 102: ...F 0805 47K 5 R823 036 15470 00 RES M F 0805 47K 5 R824 036 14220 00 RES M F 0805 2K2 5 R825 036 14220 00 RES M F 0805 2K2 5 R826 036 14220 00 RES M F 0805 2K2 5 R827 036 14220 00 RES M F 0805 2K2 5 R...

Page 103: ...00 04 CAP ELE RA 10M 16V 4X7MM C231 020 08100 04 CAP ELE RA 10M 16V 4X7MM C233 020 08100 04 CAP ELE RA 10M 16V 4X7MM C235 015 24100 08 CAP CER 0805 1N 10 X7R 50V C237 015 24100 08 CAP CER 0805 1N 10 X...

Page 104: ...25100 08 CAP CER 0805 10N 10 X7R 50V C761 015 25100 08 CAP CER 0805 10N 10 X7R 50V C762 014 08220 01 L CAP TANT 22UF10V276MSER C764 015 25100 08 CAP CER 0805 10N 10 X7R 50V C765 014 07470 00 CAP TANT...

Page 105: ...245 036 14100 10 RES M F 0805 CHIP 1K 1 R247 036 14220 00 RES M F 0805 2K2 5 R249 036 15100 10 RES M F 0805 10K 1 R251 036 15390 00 RES M F 0805 39K 5 R252 036 14470 00 RES M F 0805 4K7 5 R254 036 148...

Page 106: ...F 0805 47K 5 R823 036 15470 00 RES M F 0805 47K 5 R824 036 14220 00 RES M F 0805 2K2 5 R825 036 14220 00 RES M F 0805 2K2 5 R826 036 14220 00 RES M F 0805 2K2 5 R827 036 14220 00 RES M F 0805 2K2 5 R...

Page 107: ...A 1 L5 6 E8 C611B 1 M5 6 F8 C623 1 M6 6 N8 C625 1 M6 6 Q8 C626 1 M6 6 R8 C628 1 M6 6 R8 C630 1 M5 6 K4 C631A 1 M5 6 M6 C631B 1 N5 6 M6 C637 1 M6 6 P5 C640 1 M5 6 R5 C651 1 M5 6 M4 C658 1 M5 6 J1 C660...

Page 108: ...1 K2 8 F5 Q850 1 L2 8 G5 Q860 1 K4 8 B4 Q870 1 L4 8 C4 Q880 1 L2 8 L5 Q890 1 L4 8 K3 Q895 1 M3 8 P2 R6 nil 1 L5 R160 1 P2 1 Q4 R201 2 D6 2 B8 R202 2 D6 2 B7 R204 2 C6 2 C9 R205 2 C7 2 C8 R207 2 C7 2...

Page 109: ...1 L2 8 N4 R853 1 L2 8 Q4 R854 1 N3 8 C1 R855 1 N3 8 C2 R856 1 N3 8 D2 R857 1 N4 8 D2 R858 1 N3 8 C0 R859 1 N3 8 D0 R860 1 N3 8 E0 R861 1 M3 8 F0 R863 1 N3 8 F2 R865 1 M3 8 G2 R866 1 M3 8 H2 R867 1 M3...

Page 110: ...T865 Preliminary PCB Information T865 Grid Reference Index Page B6 26...

Page 111: ...part of the manual is divided into six sections as listed below There is a detailed table of contents at the start of each section Section Title 1 General Information 2 Circuit Operation 3 Initial Tu...

Page 112: ...CII M860 00 Preliminary 30 06 98 Copyright TEL...

Page 113: ...tion Title Page 1 1 Introduction 1 3 1 2 1 2 1 1 2 2 1 2 3 1 2 4 1 2 4 1 1 2 4 2 1 2 4 3 1 2 5 1 2 6 1 2 6 1 1 2 6 2 1 2 6 3 Specifications Introduction General RF Section Audio Processor Inputs Modul...

Page 114: ...C1 2 T867 General Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 115: ...into the remaining audio circuitry in almost any combination All audio processor options are link selectable The synthesiser frequency is programmed via the serial communications port Eight channel se...

Page 116: ...est methods and the conditions which apply for Type Approval testing in all countries can be obtained from Tait Electronics Ltd The terms wide bandwidth mid bandwidth and narrow bandwidth used in this...

Page 117: ...djustable in 10 second steps 1 2 3 RF Section Frequency Range 220 285MHz refer to Section 1 4 Modulation Type FM Frequency Increment 5 or 6 25kHz Switching Range 8MHz Load Impedance 50 ohms Frequency...

Page 118: ...ut Impedance 600 ohms balanced Sensitivity 60 modulation 1kHz With Compressor 50dBm Without Compressor 30dBm Microphone Input Impedance 600 ohms Sensitivity 60 modulation 1kHz With Compressor 70dBm Wi...

Page 119: ...rtion 1 2 max Generated Tone Flatness flat across 67 to 250 3Hz to within 1dB Modulation Level adjustable Modulated Distortion 5 1 2 5 Microcontroller Auxiliary Ports Open Drain Type capable of sinkin...

Page 120: ...se in the receiver ETS 300 279 February 1996 Radio equipment and systems electromagnetic compatibility EMC standard for pri vate land mobile radio PMR and ancillary equipment speech and or non speech...

Page 121: ...tion of the product as follows T86X XX XXXX T865 receiver T867 exciter T869 100W power amplifier Type The Type group uses two digits to indicate the basic RF configuration of the product The first dig...

Page 122: ...the table that is screen printed onto the PCB refer to Section 6 1 for more details a A TCXO with a stability of 1ppm 0 C to 60 C is available to suit specific requirements Contact your nearest autho...

Page 123: ...ation on identifying and locating components and test points on the main PCB The parts list and diagrams for the VCO PCB are in Part E The following topics are covered in this section Section Title Pa...

Page 124: ...Page 2 1 2 2 2 3 2 4 2 5 2 6 2 7 T867 High Level Block Diagram T867 Microcontroller Block Diagram T867 Synthesiser Block Diagram T867 Two Point Modulation T867 Audio Processor Block Diagram T867 Power...

Page 125: ...n inte gral part of the main chassis The configuration of the circuit blocks may be seen on a functional level in Figure 2 1 Refer to the circuit diagrams in Section 6 3 for more detail Figure 2 1 T86...

Page 126: ...is serial bus is also used by the microcontroller to program the synthesiser IC740 and deviation control EPOTS IC220 The main tasks of the microcontroller are as follows program the synthesiser and EP...

Page 127: ...C720 pins 3 4 Q730 Q740 before being divided down to 6 25kHz or 5kHz within the synthe siser IC IC740 A buffered output of the VCO Q795 is divided with a prescaler and programmable divider which is in...

Page 128: ...s an error and corrects for it resulting in no modulation on the carrier At modu lation frequencies greater than 300Hz the loop cannot correct fast enough and modula tion is seen on the carrier The re...

Page 129: ...ally to the exciter drive amplifier A low level sniff is taken from the input of Q5 and used to drive the divider buffer Q795 for the synthesiser IC740 The VCO operates at the actual output frequency...

Page 130: ...r unbalanced line and the other from a local microphone The microphone signal is passed first to a pre amplifier Q210 and ultimately to a multiplexer IC240 but in between may pass through the compress...

Page 131: ...tude of the audio signal This square wave pumps up the reservoir capacitor C233 which controls the attenuator Q230 Q220 thus complet ing the feedback loop The compression level is set by adjustment of...

Page 132: ...40 Q630 Q620 which pro vides a medium current capability 9V supply A switching power supply Q660 Q670 runs from the 9V supply and provides a low current capability 20V supply This is used to drive the...

Page 133: ...time during which the transmitter stays keyed after the exter nal key source has been removed 0 5 seconds in 100ms steps Transmit Timeout Sets the maximum continuous trans mission time Once the timer...

Page 134: ...drive amplifier This is achieved by a PIN switch attenuator D340 D350 D360 Cyclic keying control is provided by additional circuitry consisting of several time delay ramp and gate stages Q305 IC330 pi...

Page 135: ...o version 2 00 and later of the software Refer to Section 6 where the parts lists grid reference index and diagrams will provide detailed information on identifying and locating components and test po...

Page 136: ...ulator Adjustment Limiter Adjustment Line Level Without Compressor Compressor Compressor On Line Input Only Compressor On Microphone Input Only Compressor On Both Line Microphone Inputs 3 10 3 10 3 10...

Page 137: ...ing the PGM800Win software package and an IBM PC You can also use PGM800Win to select the exciter s current operating frequency or default channel If the exciter is installed in a rack frame you can p...

Page 138: ...ipment set ups Figure 3 1 T867 Test Equipment Set up With T800 01 0010 Figure 3 2 T867 Test Equipment Set up Without T800 01 0010 or RF test set optional Frequency Counter Audio Voltmeter RF Power Met...

Page 139: ...processor section as required refer to Section 3 5 3 4 2 Synthesiser Alignment Connect a high impedance voltmeter to PL4 1 or the junction of L1 R1 in the VCO this measures the synthesiser loop volta...

Page 140: ...ust the output from the audio generator to obtain 3kHz 2 4kHz 1 5kHz deviation at 500Hz 3 Change the input frequency to 50Hz and adjust reference modulation via PGM800Win to obtain 3kHz 2 4kHz 1 5kHz...

Page 141: ...4 7kHz 3 8kHz 2 3kHz you can use either the mouse or up and down arrow keys Sweep the audio frequency from 100Hz to 4kHz and ensure that the maximum deviation does not exceed 4 7kHz 3 8kHz 2 3kHz Read...

Page 142: ...output to multiplexer input PL210 1 2 3 4 5 6 L M N multiplexer output to pre emphasis input multiplexer output to limiter input multiplexer output to compressor input PL215 1 2 3 4 5 6 7 8 9 10 G H...

Page 143: ...mmer CT for a synthesiser loop voltage of 8V Multichannel Tune VCO trimmer CT for a synthesiser loop voltage of 8V on the middle channel If there is no middle channel tune CT so that the channels are...

Page 144: ...nt modulation Note 3 To optimise the modulation response across the switching range repeat steps 1 4 below for each channel that will be used usually needed only for data applications In applications...

Page 145: ...3kHz you can use either the mouse or up and down arrow keys Sweep the audio frequency from 100Hz to 4kHz and ensure that the maximum deviation does not exceed 4 7kHz 3 8kHz 2 3kHz Readjust deviation...

Page 146: ...0 compression level fully clockwise Acoustically couple the microphone to a tone box 1kHz and close the PTT switch Increase the audio level until the demodulated waveform shows significant signs of cl...

Page 147: ...to version 2 00 and later of the software Refer to Section 3 3 for the test equipment set up Refer also to Section 6 where the parts lists grid reference index and diagrams will provide detailed infor...

Page 148: ...C4 2 T867 Functional Testing M860 00 Preliminary 30 06 98 Copyright TEL...

Page 149: ...nect an RF power meter to the T867 output socket Key the T867 by earthing the Tx Key line Check that the output power is 600mW 150mW 4 3 Output Frequency Connect the T867 output to a frequency counter...

Page 150: ...kHz 1 5kHz deviation at 1kHz Increase the line level 20dB and sweep the modulation frequency The response should closely match that shown in Figure 4 3 Timer Function Adjustment Transmit Tail Sets the...

Page 151: ...tion figures are as follows peak max deviation 0 8kHz peak max deviation 0 8kHz 10 8 Modulation Level dB ref to dev 1kHz 6 4 2 0 2 4 6 8 10 12 14 16 18 20 22 100 200 300 500 1k 2k 3k 5k 10k Frequency...

Page 152: ...z Peak max dev 4 9kHz 1500Hz Peak max dev 4 4kHz 2500Hz Above limiting steady state Mid Bandwidth The mid bandwidth graph is the same shape as the wide bandwidth graph The devia tion figures are as fo...

Page 153: ...ation is dependent on the audio input level 4 7 CTCSS Encoder Program a CTCSS tone on the set channel using PGM800Win Key T867 with the front panel Carrier switch Adjust RV805 CTCSS level adjust to gi...

Page 154: ...C4 8 T867 Functional Testing M860 00 Preliminary 30 06 98 Copyright TEL...

Page 155: ...sets Note 2 Unless otherwise specified the term PGM800Win used in this and follow ing sections refers to version 2 00 and later of the software Refer to Section 6 where the parts lists grid reference...

Page 156: ...C5 2 T867 Fault Finding M860 00 Preliminary 30 06 98 Copyright TEL Figure Title Page 5 1 RF Diode Probe Circuit 5 5...

Page 157: ...tance ranges The collector current drawn by multi junction transistors is a further guide to their per formance If an IC is suspect the most reliable check is to measure the DC operating voltages Due...

Page 158: ...20V TP603 rails at their respective test points in the regulator compartment Check that Tx Reg TP305 in the exciter compartment comes up to 8 8V when the exciter is keyed Check the 5V digital regulato...

Page 159: ...and 1000mW Note If the synthesiser is out of lock the lock detector synthesiser IC740 and comparator IC750 will prevent the RF signal from reaching the PA by switching the supply to the exciter ampli...

Page 160: ...elected externally Try turning the external channel switch off to change the default channel in PGM800Win Synth Out Of Lock The synthesiser received incorrect data or the data was corrupted Enter a fr...

Page 161: ...g Check state of pin 35 Y Is pin 30 pulsing High or open circuit Y Static high low Check state of pins 36 to 43 Low floating High Is the 12 8MHz clock present on IC810 pin 21 microcontroller N Replace...

Page 162: ...the radio Check the transistor interface circuitry and or replace the programming lead Check the SERIAL COM and AUDIO 1 2 links Replace IC810 Check the transistor interface circuitry and or replace th...

Page 163: ...ck IC810 pins 24 25 26 microcontroller Are there 5V square waves at the CTCSS frequency Check IC830 pins 1 7 14 Are there 9V square waves at the CTCSS frequency Check IC830 pin 8 Is there a sine wave...

Page 164: ...k Q630 Q620 IC640 N Y 9 0V present on TP602 Check Q660 is switching at approx 150kHz N Y 20V present on TP603 Check R615 Replace IC610 N Y 5V present on IC610 pin 2 Key Tx Y Regulators OK N 8 8V prese...

Page 165: ...ent on Q795 emitter Check 9V supply 9V present on Q795 divider buffer 20V inverter supply faulty 20V present on IC750 pin 8 Check 5V reg supply resistor to each IC 5V present at IC700 IC710 IC740 IC72...

Page 166: ...3 4 Are there very narrow pulses 50ns at the reference frequency i e 5kHz 200 s period 6 25kHz 160 s period See Note below Is the charge pump bias voltage at the base of Q760 Q780 between 3 5 and 5V...

Page 167: ...lty Go to B Loop filter components around op amp IC750 OK N Noisy synth poor residual FM C Isolate audio modulation on VCO still noisy Trace audio fault Y Y N Y Y Y Change trimmer still noisy Change Q...

Page 168: ...d R359 R360 R362 Check Q365 Check signal path between Q365 Q370 Check Q370 3 5V at Q365 collector 10 5V at Q370 collector Check power rails 5V present on IC330 pin 1 Key exciter lock synthesiser Check...

Page 169: ...Check audio path between integrator phase modulator N Y 200kHz clipped triangle wave at IC720 pins 8 4 Check IC720 Q710 Q720 Q730 Q740 D710 D720 C727 C729 C724 C725 N Y Check loop filter IC750 pins 5...

Page 170: ...C5 16 T867 Fault Finding M860 00 Preliminary 30 06 98 Copyright TEL...

Page 171: ...ormation C6 1 Copyright TEL 30 06 98 6 T867 PCB Information This section provides the following information on the T867 exciter parts lists grid reference indexes PCB layouts test points options conne...

Page 172: ...C6 2 T867 PCB Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 173: ...The only function of this resistor is to indicate the product type It has no effect on the circuitry or operation of the transmitter or exciter PCB Identification All PCBs are identified by a unique 1...

Page 174: ...ts A variant component is one that has the same circuit reference but different value or specification in different product types Where two products share the same PCB the term variant is also used to...

Page 175: ...circuit diagram grid references are useful in following a circuit that is spread over two or more sheets When a line representing part of the circuitry is discontinued a reference will be given at the...

Page 176: ...C6 6 T867 PCB Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 177: ...35 015 24100 08 CAP CER 0805 1N 10 X7R 50V C237 014 07100 02 CAP TANT CHIP 1U0 3 2 X 1 6MM C239 020 07470 92 CAP BI P RA 4M7 50V 6X11 5 LS C241 015 06100 08 CAP CER 1206 100N 10 X7R 50V C242 014 08100...

Page 178: ...6 3X9MM C841 020 09100 04 CAP ELE RA 100M 10V 6 3X9MM C844 015 25100 08 CAP CER 0805 10N 10 X7R 50V C910 015 02100 06 CAP CER 1210 10P NPO500VGRM42 C920 015 02180 06 CAP CER 1210 18P NPO500VGRM42 C930...

Page 179: ...RES M F 0805 ZERO OHM R286 036 14220 00 RES M F 0805 2K2 5 R287 036 15100 00 RES M F 0805 10K 5 R288 036 15120 00 RES M F 0805 12K 5 R289 036 16100 00 RES M F 0805 100K 5 R290 036 13560 00 RES M F 08...

Page 180: ...RES M F 0805 4K7 5 R810 036 14470 00 RES M F 0805 4K7 5 R811 036 14470 00 RES M F 0805 4K7 5 R812 036 14470 00 RES M F 0805 4K7 5 R813 036 14470 00 RES M F 0805 4K7 5 R815 036 15470 00 RES M F 0805 47...

Page 181: ...35 015 24100 08 CAP CER 0805 1N 10 X7R 50V C237 014 07100 02 CAP TANT CHIP 1U0 3 2 X 1 6MM C239 020 07470 92 CAP BI P RA 4M7 50V 6X11 5 LS C241 015 06100 08 CAP CER 1206 100N 10 X7R 50V C242 014 08100...

Page 182: ...6 3X9MM C841 020 09100 04 CAP ELE RA 100M 10V 6 3X9MM C844 015 25100 08 CAP CER 0805 10N 10 X7R 50V C910 015 02100 06 CAP CER 1210 10P NPO500VGRM42 C920 015 02180 06 CAP CER 1210 18P NPO500VGRM42 C930...

Page 183: ...RES M F 0805 ZERO OHM R286 036 14220 00 RES M F 0805 2K2 5 R287 036 15100 00 RES M F 0805 10K 5 R288 036 15120 00 RES M F 0805 12K 5 R289 036 16100 00 RES M F 0805 100K 5 R290 036 13560 00 RES M F 08...

Page 184: ...RES M F 0805 4K7 5 R810 036 14470 00 RES M F 0805 4K7 5 R811 036 14470 00 RES M F 0805 4K7 5 R812 036 14470 00 RES M F 0805 4K7 5 R813 036 14470 00 RES M F 0805 4K7 5 R815 036 15470 00 RES M F 0805 47...

Page 185: ...35 015 24100 08 CAP CER 0805 1N 10 X7R 50V C237 014 07100 02 CAP TANT CHIP 1U0 3 2 X 1 6MM C239 020 07470 92 CAP BI P RA 4M7 50V 6X11 5 LS C241 015 06100 08 CAP CER 1206 100N 10 X7R 50V C242 014 08100...

Page 186: ...6 3X9MM C841 020 09100 04 CAP ELE RA 100M 10V 6 3X9MM C844 015 25100 08 CAP CER 0805 10N 10 X7R 50V C910 015 02100 06 CAP CER 1210 10P NPO500VGRM42 C920 015 02180 06 CAP CER 1210 18P NPO500VGRM42 C930...

Page 187: ...RES M F 0805 ZERO OHM R286 036 14220 00 RES M F 0805 2K2 5 R287 036 15100 00 RES M F 0805 10K 5 R288 036 15120 00 RES M F 0805 12K 5 R289 036 16100 00 RES M F 0805 100K 5 R290 036 13560 00 RES M F 08...

Page 188: ...RES M F 0805 4K7 5 R810 036 14470 00 RES M F 0805 4K7 5 R811 036 14470 00 RES M F 0805 4K7 5 R812 036 14470 00 RES M F 0805 4K7 5 R813 036 14470 00 RES M F 0805 4K7 5 R815 036 15470 00 RES M F 0805 47...

Page 189: ...35 015 24100 08 CAP CER 0805 1N 10 X7R 50V C237 014 07100 02 CAP TANT CHIP 1U0 3 2 X 1 6MM C239 020 07470 92 CAP BI P RA 4M7 50V 6X11 5 LS C241 015 06100 08 CAP CER 1206 100N 10 X7R 50V C242 014 08100...

Page 190: ...6 3X9MM C841 020 09100 04 CAP ELE RA 100M 10V 6 3X9MM C844 015 25100 08 CAP CER 0805 10N 10 X7R 50V C910 015 02100 06 CAP CER 1210 10P NPO500VGRM42 C920 015 02180 06 CAP CER 1210 18P NPO500VGRM42 C930...

Page 191: ...RES M F 0805 ZERO OHM R286 036 14220 00 RES M F 0805 2K2 5 R287 036 15100 00 RES M F 0805 10K 5 R288 036 15120 00 RES M F 0805 12K 5 R289 036 16100 00 RES M F 0805 100K 5 R290 036 13560 00 RES M F 08...

Page 192: ...RES M F 0805 4K7 5 R810 036 14470 00 RES M F 0805 4K7 5 R811 036 14470 00 RES M F 0805 4K7 5 R812 036 14470 00 RES M F 0805 4K7 5 R813 036 14470 00 RES M F 0805 4K7 5 R815 036 15470 00 RES M F 0805 47...

Page 193: ...235 015 24100 08 CAP CER 0805 1N 10 X7R 50V C237 014 07100 02 CAP TANT CHIP 1U0 3 2 X 1 6MM C239 020 07470 92 CAP BI P RA 4M7 50V 6X11 5 LS C241 015 06100 08 CAP CER 1206 100N 10 X7R 50V C242 014 0810...

Page 194: ...6 3X9MM C841 020 09100 04 CAP ELE RA 100M 10V 6 3X9MM C844 015 25100 08 CAP CER 0805 10N 10 X7R 50V C910 015 02100 06 CAP CER 1210 10P NPO500VGRM42 C920 015 02180 06 CAP CER 1210 18P NPO500VGRM42 C930...

Page 195: ...RES M F 0805 ZERO OHM R286 036 14220 00 RES M F 0805 2K2 5 R287 036 15100 00 RES M F 0805 10K 5 R288 036 15120 00 RES M F 0805 12K 5 R289 036 16100 00 RES M F 0805 100K 5 R290 036 13560 00 RES M F 08...

Page 196: ...RES M F 0805 4K7 5 R810 036 14470 00 RES M F 0805 4K7 5 R811 036 14470 00 RES M F 0805 4K7 5 R812 036 14470 00 RES M F 0805 4K7 5 R813 036 14470 00 RES M F 0805 4K7 5 R815 036 15470 00 RES M F 0805 47...

Page 197: ...235 015 24100 08 CAP CER 0805 1N 10 X7R 50V C237 014 07100 02 CAP TANT CHIP 1U0 3 2 X 1 6MM C239 020 07470 92 CAP BI P RA 4M7 50V 6X11 5 LS C241 015 06100 08 CAP CER 1206 100N 10 X7R 50V C242 014 0810...

Page 198: ...6 3X9MM C841 020 09100 04 CAP ELE RA 100M 10V 6 3X9MM C844 015 25100 08 CAP CER 0805 10N 10 X7R 50V C910 015 02100 06 CAP CER 1210 10P NPO500VGRM42 C920 015 02180 06 CAP CER 1210 18P NPO500VGRM42 C930...

Page 199: ...RES M F 0805 ZERO OHM R286 036 14220 00 RES M F 0805 2K2 5 R287 036 15100 00 RES M F 0805 10K 5 R289 036 16100 00 RES M F 0805 100K 5 R290 036 13560 00 RES M F 0805 560E 5 R291 036 10000 00 RES M F 0...

Page 200: ...R810 036 14470 00 RES M F 0805 4K7 5 R811 036 14470 00 RES M F 0805 4K7 5 R812 036 14470 00 RES M F 0805 4K7 5 R813 036 14470 00 RES M F 0805 4K7 5 R815 036 15470 00 RES M F 0805 47K 5 R816 036 16150...

Page 201: ...7 E8 C712 1 H2 7 E7 C713 1 H2 7 E6 C720 1 J3 7 F8 C722 1 J4 7 G8 C724 1 J4 7 H6 C725 1 J4 7 J6 C726 1 K4 7 J6 C727 1 J3 7 J8 C729 1 H3 7 M8 C733 1 J3 7 M5 C735 1 J2 7 A1 C736 1 J2 7 B1 C740A 1 H2 7 B4...

Page 202: ...4 2 G4 R253 1 C6 2 J2 R254 1 C6 2 K3 R255 1 C7 2 K2 R256 1 D8 2 M3 R257 1 D8 2 N5 R258 1 D8 2 N4 R259 1 D6 2 P4 R260 1 D8 2 N4 R262 1 D8 2 N3 R263 1 C8 2 P3 R264 1 C8 2 P3 R265 1 C8 2 P3 R266 1 C8 2 P...

Page 203: ...8 E1 R865 1 N4 8 E0 R867 1 N3 8 E1 R871 1 N3 8 G2 R872 1 M4 8 H1 R873 1 N3 8 G1 R874 1 N3 8 H0 R875 1 N3 8 G0 R876 1 N3 8 H0 R877 1 M2 8 K2 R879 1 N2 8 L3 RV210 1 B7 2 F9 RV220 1 A4 2 M6 RV300 1 F9 3...

Page 204: ...T867 Preliminary PCB Information T867 Grid Reference Index Page C6 34...

Page 205: ...r amplifier Refer all servicing to your nearest approved Tait Dealer or Service Cen tre This part of the manual is divided into five sections as listed below There is a detailed table of contents at t...

Page 206: ...DII M860 00 Preliminary 30 06 98 Copyright TEL...

Page 207: ...rovides a brief description of the T869 PA along with detailed specifica tions and a list of types available The following topics are covered in this section Section Title Page 1 1 Introduction 1 3 1...

Page 208: ...D1 2 T869 General Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 209: ...roduce at least one quarter of its rated power Furthermore the inherent operation of the push pull pairs within the quadrature archi tecture provides a further advantage of suppressing even order harm...

Page 210: ...methods and the conditions which apply for Type Approval testing in all countries can be obtained from Tait Electronics Ltd 1 2 2 General Power Output Rated Power 100W Range Of Adjustment 20 to 110W...

Page 211: ...TEL 30 06 98 Spurious Emissions Conducted Transmit 36dBm to 1GHz 30dBm to 4GHz Standby 57dBm to 1GHz 47dBm to 4GHz Radiated Transmit 36dBm to 1GHz 30dBm to 4GHz Standby 57dBm to 1GHz 47dBm to 4GHz Di...

Page 212: ...tion of the product as follows T86X XX XXXX T865 receiver T867 exciter T869 100W power amplifier Type The Type group uses two digits to indicate the basic RF configuration of the product The first dig...

Page 213: ...nformation a In the United States only the T869 10 0000 operates from 217 244MHz You can identify the receiver type by checking the product code printed on a label on the rear of the chassis Figure 1...

Page 214: ...D1 8 T869 General Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 215: ...ntroduction 2 3 2 2 RF Circuitry 2 5 2 3 2 3 1 2 3 2 2 3 3 2 3 4 2 3 5 2 3 6 Control Circuitry Power Control Driver Power Level Thermal Protection Forward And Reverse Power Alarms Forward And Reverse...

Page 216: ...D2 2 T869 Circuit Operation M860 00 Preliminary 30 06 98 Copyright TEL...

Page 217: ...the drive level to approx 20W 30W typical the final stage is composed of four transistors Q59 Q60 Q61 Q62 whose out puts are combined to provide the rated output power The configuration of each of the...

Page 218: ...control alarms drive amplifier input splitter final amplifiers output combiner low pass filter directional coupler A B C D E F G RF input power control transistor Q20 power module input hybrid termin...

Page 219: ...d to drive two isolated push pull stages Q59 Q60 Q61 Q62 The outputs from these push pull stages are recombined by L501 and passed to the antenna socket via the directional coupler and low pass filter...

Page 220: ...Low Forward Power LED Reverse Power Meter Reverse Power Alarm Forward Power Meter Forward Power Alarm 7V 7V Tx Key IC1 RV48 RV43 Q20 Q19 Q1 13 8V Filtered Integrator IC5 Control Supply t R193 NTC RV6...

Page 221: ...s factory set to give a maximum power output of 110W The unit may be damaged if this level is increased 2 3 3 Thermal Protection At excessively high temperatures the output power will automatically re...

Page 222: ...3 at temperatures greater than 10 C A logic AND function is applied to the comparator outputs by Q10 and Q15 thereby turning on the fan unconditionally via Q12 and Q13 if the heatsink temperature exce...

Page 223: ...n on identifying and locating components The following topics are covered in this section Section Title Page 3 1 Test Equipment Required 3 3 3 2 Preliminary Checks 3 3 3 3 Setting The Output Power 3 4...

Page 224: ...D3 2 T869 Initial Adjustment M860 00 Preliminary 30 06 98 Copyright TEL...

Page 225: ...1 T869 Test Equipment Set up Caution Do not connect attenuators or DC blocks between the T867 and T869 or the cyclic keying circuitry will not function correctly 3 2 Preliminary Checks Check for short...

Page 226: ...869 and power meter set up Note 2 You will need appropriate extension leads if you wish to carry out the adjustment procedures with the T869 withdrawn from the rack in the latched position Alternative...

Page 227: ...g 3 7 Remote Reverse Power Meter Calibration If a remote meter is connected connect a 50 ohm 3dB pad with the output open circuit to the PA output Apply RF drive and Tx key Adjust the reverse power me...

Page 228: ...D lights Check the alarm level setting by adjusting the power up and down and observing the alarm LED A few watts hysteresis can be expected Readjust RV63 for the normal operating level Note Remote in...

Page 229: ...e Centre Further assistance may be obtained from the Customer Support Group Radio Systems Division Tait Electronics Ltd Christchurch New Zealand Refer to Section 5 where the parts lists grid reference...

Page 230: ...D4 2 T869 Fault Finding M860 00 Preliminary 30 06 98 Copyright TEL...

Page 231: ...Caution Before operating the PA replace any RF base chokes removed while making measurements The collector current drawn by multi junction transistors is a further guide to their per formance If an I...

Page 232: ...put test points for RF module IC6 and RF transistors Q59 Q62 Note 1 Use good quality 50 coax for the flying test leads Note 2 Ensure each output is terminated in a 50 load of the correct power rating...

Page 233: ...M860 00 Preliminary T869 Fault Finding D4 5 Copyright TEL 30 06 98 replace A4 pages D4 5 D4 6 with A3 pages D4 5 D4 6...

Page 234: ...D4 6 T869 Fault Finding M860 00 Preliminary 30 06 98 Copyright TEL replace A4 pages D4 5 D4 6 with A3 pages D4 5 D4 6...

Page 235: ...utput 20W see Figure 4 1 Check the condition of splitter hybrid L500 Are there any shorts between the splitter wires or broken wires Q59 Q60 Q61 Q62 outputs each 60W test in pairs as per Figure 4 1 Ch...

Page 236: ...er Check IC1 pins 1 8 Check Q1 Q11 Check IC1 pin 14 12V DC when forward power low High Reverse Power Alarm Check Check Q16 Q17 Check IC1 pin 7 12V DC when reverse power high Does high reverse power al...

Page 237: ...Y Y Do not key transmitter Does high temperature control circuit activate fan Fan control OK N Y Check Q10 Q15 collector voltages Check Q12 Q13 Check IC3 pin 1 1V Check Q9 Check Tx key is low at grou...

Page 238: ...D4 10 T869 Fault Finding M860 00 Preliminary 30 06 98 Copyright TEL...

Page 239: ...CB Information This section provides the following information on the T869 power amplifier parts lists grid reference index exploded view mechanical drawing PCB layouts circuit diagrams Section Title...

Page 240: ...D5 1 2 T869 PCB Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 241: ...ts orders can be handled more efficiently if you quote the IPN and provide a brief descrip tion of the part The components listed in this parts list are divided into two main types those with a circui...

Page 242: ...cal axis These circuit diagram grid references are useful in following a circuit that is spread over two or more sheets When a line representing part of the circuitry is discontinued a reference will...

Page 243: ...ation IPN Section Page 220 01371 01 Parts List Mechanical Miscellaneous Parts Mechanical Assembly Rack Frame Guide Mechanical Assembly Grid Reference Index PCB Encoding Errors PCB Layout Bottom Side P...

Page 244: ...D5 2 2 T869 PCB Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 245: ...the circuit reference variant if applicable IPN and description A number in the variant col umn indicates that this is a variant component which is fitted only to the product type listed The miscella...

Page 246: ...CER 1210 CHIP 10P 5 NPO 500V GRM42 C144 015 02100 06 CAP CER 1210 CHIP 10P 5 NPO 500V GRM42 C146 015 02680 03 CAP CER CHIP 68P 5 NPO 500V HIQ GRH111 2 8MM3 C147 015 03680 03 CAP CER CHIP 680P 5 NPO 1...

Page 247: ...036 16220 00 RES M F 0805 CHIP 220K 5 RV43 042 05470 09 RES PRESET 50K CERMET 9 5MM SQ FLAT R43 036 16220 00 RES M F 0805 CHIP 220K 5 R44 036 15270 00 RES M F 0805 CHIP 27K 5 R45 036 16470 00 RES M F...

Page 248: ...119 X 119 X 25MM TUBE AXIAL 302 05204 00 28 BRKT A3M2314 F THRU MTG T859 303 23146 00 50 COVER SIDE T869PA 306 01010 00 45 FERRULE A4M948 HANDLE FXD EQUIP 308 01007 00 46 HANDLE A4M949 FXD EQUIP 308...

Page 249: ...M860 00 Preliminary T869 PCB Information D5 2 7 Copyright TEL 30 06 98 replace A4 pages D5 2 7 D5 2 8 with A3 pages D5 2 7 D5 2 8...

Page 250: ...D5 2 8 T869 PCB Information M860 00 Preliminary 30 06 98 Copyright TEL replace A4 pages D5 2 7 D5 2 8 with A3 pages D5 2 7 D5 2 8...

Page 251: ...2 J3 C162 1 H5 2 L3 C163 1 H6 2 L3 C165 1 H5 2 N3 C166 1 H6 2 O4 C168 1 H5 2 N3 C170 1 J5 2 M2 C171 1 H5 2 M2 C172 1 H5 2 N2 C175 1 J6 2 H1 C176 1 J7 2 I1 C178 1 H7 2 J1 C179 1 H6 2 J1 C181 1 H6 2 K1...

Page 252: ...1 E2 R57 1 B3 1 E3 RV57 1 C3 1 F2 R58 1 C4 1 F2 R59 1 B3 1 C1 R60 1 C5 1 H3 R61 1 C5 1 I2 R62 1 C5 1 I2 RV63 1 P5 1 L1 RV63A 1 P5 1 L1 R68 1 B2 1 C0 R69 1 B2 1 C0 RV69 1 C3 1 E0 R71 1 D3 1 E0 R72 1 D2...

Page 253: ...minary T869 PCB Information D5 2 11 Copyright TEL 30 06 98 T869 PCB Encoding Errors IPN 220 01371 01 The following diagram shows corrections to the encoding printed on the top side of the PCB correcti...

Page 254: ...D5 2 12 T869 PCB Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 255: ...This part of the manual is divided into the sections listed below These sections provide parts lists PCB layouts and circuit diagrams for the T860 VCO PCB There is a detailed table of contents at the...

Page 256: ...EII M860 00 Preliminary 30 06 98 Copyright TEL...

Page 257: ...CO PCB Information E1 1 Copyright TEL 30 06 98 1 T860 VCO PCB This section contains the following information IPN Section Page 220 01399 02 Parts List PCB Layout Bottom Side PCB Layout Top Side Circui...

Page 258: ...E1 2 T860 VCO PCB Information M860 00 Preliminary 30 06 98 Copyright TEL...

Page 259: ...AP TANT CHIP 4U7 3 5 X 2 8MM C5 015 06100 08 CAP CER 1206 100N 10 X7R 50V C6 014 07470 00 CAP TANT CHIP 4U7 3 5 X 2 8MM C7 015 24100 08 CAP CER 0805 1N 10 X7R 50V C9 015 23120 01 CAP CER 0805 120P 5 N...

Page 260: ...6E 5 R18 036 14100 00 RES M F 0805 1K 5 R19 036 12180 00 RES M F 0805 18E 5 R20 036 13270 00 RES M F 0805 270E 5 R21 036 13270 00 RES M F 0805 270E 5 R22 036 14220 00 RES M F 0805 2K2 5 R23 036 14680...

Page 261: ...T860 VCO PCB IPN 220 01399 02 Bottom Side Copyright TEL 30 06 98 M860 00 Preliminary T860 VCO PCB Information E1 5 220 01399 02...

Page 262: ...ide A C1 C2 C36 CPA CPB CSA CSB L R6 C10 C12 C13 C14 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C3 C30 C31 C35 C4 C5 C6 C7 C9 CF CT D1 D2 L1 L2 L3 L4 L6 L7 L8 L9 Q1 Q2 Q3 Q4 Q5 R1 R11 R12 R13 R14...

Page 263: ...1 1 1 2 1 2 2 2 1 2 2 2 3 2 4 T867 Installation Rack Mounting Rack Wiring Power Supply Reverse Polarity Protection 2 1 2 1 2 1 2 2 2 2 3 3 1 3 2 3 3 3 4 T869 Installation Rack Mounting Rack Wiring Po...

Page 264: ...FII M860 00 Preliminary 30 06 98 Copyright TEL 3 1 3 2 3 3 3 4 T800 45 0001 PA Guide Kit T869 Chassis Connectors PA In Latched Position T869 D Range Wiring Rear View 3 1 3 1 3 1 3 1 Figure Title Page...

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