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B2.6

T865 Circuit Operation

M860-00-Preliminary

30/06/98

Copyright TEL

2.5

Noise Mute (Squelch)

(Refer to the audio processor and IF section circuit diagrams (sheets 2 and 3 respec-
tively) in Section 6 and Figure 2.2.)

The noise mute operates on the detected noise outside the audio bandwidth.  An opera-
tional amplifier in IC390 is used as an active band pass filter centred on 70kHz to filter
out audio components.  The noise spectrum is then further amplified in a variable gain,
two-stage amplifier (Q340 & Q350) with additional filtering.  The noise is then rectified
(D310) and filtered to produce a DC voltage proportional to the noise amplitude.  The
lowest average DC voltage corresponds to a high RF signal strength and the highest DC
voltage corresponds to no signal at the RF input.

The rectified noise voltage is compared with a threshold voltage set up on RV230, the
front panel "Gating Sensitivity" potentiometer.  Hysteresis is introduced 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 times and, in combination with solder links SL210 and SL220, provide three time
delay options (SL210 is linked as standard - refer to Section 3.8).  The mute control sig-
nal at pin 7 of IC270 is used to disable the speaker and line audio outputs.  The speaker
output can be separately enabled for test purposes by operating the front panel mute
disable switch, SW201.  

2.6

Carrier Mute

(Refer to the audio processor and IF section circuit diagrams (sheets 2 and 3 respec-
tively) in Section 6 and Figure 2.2.)

A high level carrier mute facility is also available.  The RSSI (refer to Section 2.12) pro-
vides a DC voltage proportional to the signal strength.  This voltage is compared with a
preset level, set up on RV235, and may be linked into the mute timing circuit using
PL250.  PL250 selects either the noise mute or the carrier mute.  From this point both the
noise and carrier mute circuits operate in the same manner, using common circuitry.

Содержание T860 Series II

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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