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B2.6

T855 Circuit Operation

M850-00

31/09/98

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 6.3 and Figure 2.2.)

The noise mute operates on the detected noise outside the audio bandwidth.  An opera-
tional amplifier in IC310 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 (Q350 & Q360) 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 provided 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 signal
at pin 7 of IC270 is used to disable the speaker and line audio outputs.  The speaker out-
put can be separately enabled for test purposes by operating the front panel mute disa-
ble switch, SW201.

2.6

Carrier Mute

(Refer to the audio processor and IF section circuit diagrams (sheets 2 and 3 respec-
tively) in Section 6.3 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 T850 II Series

Страница 1: ...M850 00 1 Copyright TEL 31 09 98 T850 Series II Base Station Equipment 400 520MHz Service Manual Issue 200 October 1998 M850 00 200...

Страница 2: ...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 Unit 2216 North Tower Concordia Plaza N...

Страница 3: ...have been updated and when Each page and its publication date is listed in the List of Effective Pages and a new list containing any new revised pages and their publica tion dates will be sent with e...

Страница 4: ...s Division Tait Electronics Ltd Christch urch New Zealand full contact details are on page 2 Updating Equipment And Manuals In the interests of improving performance reliability or servicing Tait Elec...

Страница 5: ...ections There is a detailed table of contents at the start of each part and or section Part Title A Introduction To Servicing B T855 Receiver C T856 Transmitter T857 Exciter D T858 T859 Power Amplifie...

Страница 6: ...31 09 98 blank 1 3 31 09 98 fold out 1 4 31 09 98 fold out 1 5 31 09 98 1 6 31 09 98 1 7 31 09 98 1 8 31 09 98 1 9 31 09 98 1 10 31 09 98 1 11 31 09 98 1 12 31 09 98 1 13 31 09 98 1 14 31 09 98 blank...

Страница 7: ...3 11 31 09 98 fold out 6 3 12 31 09 98 fold out blank 6 3 13 31 09 98 6 3 14 31 09 98 6 3 15 31 09 98 6 3 16 31 09 98 blank 6 3 17 31 09 98 fold out 6 3 18 31 09 98 fold out 6 3 19 31 09 98 fold out...

Страница 8: ...31 09 98 blank 6 1 3 31 09 98 6 1 4 31 09 98 6 1 5 31 09 98 6 1 6 31 09 98 6 2 1 31 09 98 6 2 2 31 09 98 blank 6 2 3 31 09 98 6 2 4 31 09 98 6 2 5 31 09 98 6 2 6 31 09 98 6 2 7 31 09 98 6 2 8 31 09 98...

Страница 9: ...3 31 09 98 3 4 31 09 98 3 5 31 09 98 3 6 31 09 98 3 7 31 09 98 3 8 31 09 98 3 9 31 09 98 3 10 31 09 98 blank 3 11 31 09 98 fold out 3 12 31 09 98 fold out blank 3 13 31 09 98 fold out 3 14 31 09 98 f...

Страница 10: ...II 31 09 98 1 1 31 09 98 fold out 1 2 31 09 98 fold out 2 1 31 09 98 fold out 2 2 31 09 98 fold out 3 1 31 09 98 fold out 3 2 31 09 98 fold out Part G I 31 09 98 II 31 09 98 1 1 31 09 98 1 2 31 09 98...

Страница 11: ...M850 00 11 Copyright TEL 31 09 98 Page Issue Date Page Issue Date 2 6 31 09 98 2 7 31 09 98 2 8 31 09 98 blank 3 1 31 09 98 3 2 31 09 98 3 3 31 09 98 3 4 31 09 98 blank...

Страница 12: ...12 M850 00 31 09 98 Copyright TEL...

Страница 13: ...3 2 3 1 2 3 2 2 4 Mechanical Torx Recess Head Screws Pozidriv Philips Recess Head Screws Disassembly Reassembly Receivers Exciters Transmitters Power Amplifiers Cover Screw Torques 2 1 2 1 2 2 2 3 2...

Страница 14: ...AII M850 00 31 09 98 Copyright TEL...

Страница 15: ...te 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 Device...

Страница 16: ...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 in it...

Страница 17: ...ad 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 useful...

Страница 18: ...lt 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 screw head...

Страница 19: ...e opposite side to the main D range connector D range 1 PL100 You need to remove the bottom cover to access transmitter RF power transistors and many SMD components change solder blob links fit test l...

Страница 20: ...A2 4 Mechanical M850 00 31 09 98 Copyright TEL...

Страница 21: ...nue 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 lead out...

Страница 22: ...r Customer Service Organisa tion equipped with the necessary facilities Repairs attempted with incorrect equipment or by untrained personnel may result in perma nent damage If in doubt contact your ne...

Страница 23: ...odules 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 so that...

Страница 24: ...t 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 versio...

Страница 25: ...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 Tuning A...

Страница 26: ...BII M850 00 31 09 98 Copyright TEL...

Страница 27: ...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 CTCSS Mute Operation Microprocessor Controller Test Standards...

Страница 28: ...B1 2 T855 General Information M850 00 31 09 98 Copyright TEL...

Страница 29: ...M850 00 T855 General Information B1 3 Copyright TEL 31 09 98 replace A4 pages B1 3 B1 4 with A3 pages B1 3 B1 4...

Страница 30: ...B1 4 T855 General Information M850 00 31 09 98 Copyright TEL replace A4 pages B1 3 B1 4 with A3 pages B1 3 B1 4...

Страница 31: ...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 serial communications por...

Страница 32: ...ods 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 and fol...

Страница 33: ...to 60 C Dimensions Height 191mm Width 60mm Length 324mm Weight 2 13kg 1 2 3 RF Section Frequency Range 400 530MHz Type dual conversion superheterodyne Frequency Increment 5 or 6 25kHz Switching Range...

Страница 34: ...107dBm 30dB WB 20dB WB 25dB NB 15dB NB RF Level 83dBm CEPT 54dB MB 49dB MB 50dB NB 45dB NB RF Level 57dBm EIA 55dB WB 55dB WB Selectivity Narrow Bandwidth 12 5kHz 83dB minimum 85dB typical CEPT Mid B...

Страница 35: ...kHz Line Output Power adjustable to 10dBm Load Impedance 600 ohms Distortion 70dBm signal level De emphasised Flat Wide Bandwidth 2 2 Mid Narrow Bandwidth 2 4 1 2 4 2 CTCSS Linkable High Pass Filter B...

Страница 36: ...5V 1 2 6 Test Standards Where applicable this equipment is tested in accordance with the following standards 1 2 6 1 European Telecommunication Standard ETS 300 086 January 1991 Radio equipment and s...

Страница 37: ...ecommendation T R 24 01 Annex I 1988 Technical characteristics and test conditions for radio equipment in the land mobile service intended primarily for analogue speech Annex II 1988 Technical charact...

Страница 38: ...as follows T85X XX XXXX T855 receiver T856 25W transmitter T857 exciter T858 50W power amplifier T859 100W power amplifier Type The Type group uses two digits to indicate the basic RF configuration o...

Страница 39: ...the rear of the chassis Figure 1 1 in Part A shows typical labels You can further verify the receiver type by checking the placement of an SMD resistor in the table that is screen printed onto the PC...

Страница 40: ...B1 14 T855 General Information M850 00 31 09 98 Copyright TEL...

Страница 41: ...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 Noise Mute Squelch 2 6 2 6 Carrier...

Страница 42: ...B2 2 T855 Circuit Operation M850 00 31 09 98 Copyright TEL...

Страница 43: ...lator 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 for fur...

Страница 44: ...sed through a further helical filter doublet FL420 before being presented to the mixer via a 2dB attenuator pad Each sub block within the front end has been designed with 50 ohm terminations for ease...

Страница 45: ...0 Several stages of amplification and filtering are employed in the IF circuitry The first crystal filter is a 4 pole device XF300 which is matched into 50 ohms on both its input and output ports This...

Страница 46: ...d 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 a...

Страница 47: ...ns 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 the recessed Line Level potent...

Страница 48: ...to operate 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 amplifi...

Страница 49: ...PROM 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 PGM800Wi...

Страница 50: ...vided down to 6 25kHz or 5kHz within the synthesiser IC IC740 A buffered output of the VCO is divided with a prescaler and programmable divider which is incorporated into the synthesiser chip IC740 Th...

Страница 51: ...pled into a cascode amplifier stage Q2 Q3 which supplies 10dBm nominal output Further amplifica tion in Q5 brings the output drive level to 20dBm to drive the mixer A low level sniff is taken from the...

Страница 52: ...variable gain stage Q1A is a common emitter amplifier with its emitter grounded and the AGC control loop voltage applied to its base Since the AGC loop will maintain a constant signal level at the co...

Страница 53: ...800Win used in this and follow ing sections refers to version 2 00 and later of the software Refer to Figure 4 3 which shows the location of the main tuning and adjustment con trols Refer also to Sect...

Страница 54: ...3 12 3 9 Noise Mute Adjustment 3 12 3 10 Carrier 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 3 12 1 3 12 2 3 12...

Страница 55: ...Win 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 program it vi...

Страница 56: ...rt Tuning Procedure Figure 3 2 T855 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 Audio Si...

Страница 57: ...trimmer C6 for a synthesiser loop voltage of 10V Multichannel Tune VCO trimmer C6 for a synthesiser loop voltage of 10V on the middle channel If there is no middle channel tune C6 so that the channel...

Страница 58: ...to close the mute if necessary turn off the RF sig nal and then turn it on again Rotate RV310 anticlockwise until the mute just opens Adjust RV230 for the required opening sinad 3 4 4 2 Carrier Level...

Страница 59: ...0dBm Observe the sinad meter and reduce the RF level until the receiver mute closes Slowly increase the signal level until the receiver mute just opens and stays open With PL240 pins 1 2 linked G H hi...

Страница 60: ...set the audio processor links before carrying out the receiver alignment The factory settings are shown in brackets Plug Linka a The letters in this column and in the table in Section 3 5 2 below ref...

Страница 61: ...iltered 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 speech injected back into...

Страница 62: ...to Section 3 7 3 7 Alignment Of Receiver Front End And IF Note In this and following sections deviation settings are given first for wide bandwidth sets followed by settings in brackets for mid bandwi...

Страница 63: ...5 Readjust L310 L320 L330 L340 L350 L360 L370 and L380 to give a maximum amplitude response on the oscilloscope with minimal amplitude modulation Note If you would like a more accurate method of tunin...

Страница 64: ...to close the mute if necessary turn off the RF sig nal and then turn it on again Rotate RV310 anticlockwise until the mute just opens Once the mute has been set up as described above adjust RV230 for...

Страница 65: ...5 front panel monitor volume to give an output of 2V rms into a 4 ohm resistive load Check for any clipping or distortion on the oscilloscope Switch to a 4 ohm speaker and adjust RV205 to the required...

Страница 66: ...again meas urement B Check that measurement B is at least 30dB below measurement A 3 13 RSSI The T800 04 0000 RSSI is an optional PCB which adds signal strength monitoring and high level mute facilit...

Страница 67: ...f the software Refer to Figure 4 3 for the location of the main tuning and adjustment controls and to Section 3 3 for the test equipment set up Refer also to Section 6 where the parts lists grid refer...

Страница 68: ...B4 2 T855 Functional Testing M850 00 31 09 98 Copyright TEL...

Страница 69: ...the front panel controls to the required settings 4 2 Sensitivity If CTCSS is enabled disable the CTCSS tone by either programming the T855 for No Tone on the set channel or by pulling pin 10 of D ra...

Страница 70: ...lume 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 Signal T...

Страница 71: ...d 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 Ref au...

Страница 72: ...rators can cause a false opening of the mute because the generator produces a burst of noise when the attenuation range changes To correct the problem you will have to change generators 4 8 RSSI If Fi...

Страница 73: ...er Mute Linked In Apply an on channel signal from the RF generator at a level of 120dBm with 3kHz deviation 2 4kHz 1 5kHz at 1kHz Increase the RF level in 2dB steps and check that the mute opens at an...

Страница 74: ...B4 8 T855 Functional Testing M850 00 31 09 98 Copyright TEL...

Страница 75: ...Note 1 In this and following sections deviation settings are given first for wide bandwidth sets followed by settings in brackets for mid bandwidth sets and narrow bandwidth sets Note 2 Unless otherwi...

Страница 76: ...7 5 5 7 6 5 7 7 Fault Finding Charts Microcontroller IC810 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...

Страница 77: ...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 failures the...

Страница 78: ...ontrol voltage on the long lead of L1 on the VCO PCB If the synthesiser is locked and the VCO aligned the voltage at this point should be between 3 and 16V If the VCO is not locked refer to the synthe...

Страница 79: ...fault by measuring the sensitivity into successive circuit blocks Prepare a test cable by connecting a 1nF capacitor to the end of a length of coax cable as shown in Figure 5 1 Figure 5 1 RF Test Cab...

Страница 80: ...udio signal of approximately 800mV peak to peak is present Optimum tuning of the quad coil L390 for minimum audio distortion with a flat audio response should coincide with maximum audio amplitude and...

Страница 81: ...2 Increase the RF level to 50dBm the trace will now show the shape of the 455kHz ceramic filter XF302 Check that the response has no sharp non linearities If sharp non linearities do occur replace th...

Страница 82: ...nnel is selected 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 E...

Страница 83: ...k 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 IC810...

Страница 84: ...dio 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 the prog...

Страница 85: ...t 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 31 low...

Страница 86: ...13 8V present on IC630 pin 3 5 3V present on IC630 pin 1 Check Q620 Q630 IC640 Check Q660 is switching at approx 180kHz 5V present on IC610 pin 2 Replace IC630 Check R615 Replace IC610 Check continui...

Страница 87: ...Replace if faulty Y Y 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 Check 5...

Страница 88: ...O 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 50ns at...

Страница 89: ...ect 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 biasing res...

Страница 90: ...ation Y Adjust RV230 gating sensitivity observe voltage on IC270 pin 3 Set RF signal level to 117dBm Rotate RV230 c w cc w Monitor voltage on IC270 pin 1 Switching 0 8V as RV230 rotated Monitor voltag...

Страница 91: ...g 0 8V as RV235 rotated Replace IC280 N Y Monitor voltage on IC270 pin 7 Switching 0 8V as RV235 rotated Check replace IC270 D240 N Y Monitor voltage on pad 234 Switching 0 8V as RV235 rotated Replace...

Страница 92: ...VCO RF front end IF correctly aligned High audio distortion Check repair faulty stage or component Check DC conditions OK see cct diagrams Check sensitivity into each stage see 5 5 2 See Chart B below...

Страница 93: ...wise 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 on line monitor pad 284 lin...

Страница 94: ...B5 20 T855 Fault Finding M850 00 31 09 98 Copyright TEL...

Страница 95: ...for more information on anti static procedures when handling these devices This section provides the following information on the T855 receiver parts lists grid reference indexes mechanical assembly d...

Страница 96: ...B6 1 2 T855 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 97: ...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 digit internal part number IPN e g 220 01390 02 wh...

Страница 98: ...e Parts List Amendments box an example of which is shown below This box contains a list of component changes which took place after the parts list and dia grams in this section were compiled These cha...

Страница 99: ...component grid reference index to help you find components and labelled pads on the PCB layouts and circuit diagrams This index lists the components and pads in alpha numeric order along with the app...

Страница 100: ...ollowing 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 end of the line to indicate where the rest of...

Страница 101: ...mation B6 2 1 Copyright TEL 31 09 98 6 2 T800 04 0000 RSSI PCB This section contains the following information IPN Section Page 220 01138 00 Parts List PCB Layout Top Side PCB Layout Bottom Side Circu...

Страница 102: ...B6 2 2 T800 04 0000 RSSI PCB Information M850 00 31 09 98 Copyright TEL...

Страница 103: ...rcuit reference IPN and description Static sensitive devices are indicated by an S at the start of the description column The miscellaneous and mechanical parts are listed in IPN order at the end of t...

Страница 104: ...5 CHIP 39K 5 R7 036 15100 00 RES M F 0805 CHIP 10K 5 R8 036 13680 00 RES M F 0805 CHIP 680E 5 R9 036 14820 00 RES M F 0805 CHIP 8K2 5 R10 036 16220 00 RES M F 0805 CHIP 220K 5 R11 036 13470 00 RES M F...

Страница 105: ...T800 04 0000 PCB IPN 220 01138 00 Top Side Copyright TEL 31 09 98 IPN 220 01138 00 M850 00 T800 04 0000 RSSI PCB Information B6 2 5...

Страница 106: ...IPN 220 01138 00 B6 2 6 T800 04 0000 RSSI PCB Information M850 00 31 09 98 Copyright TEL T800 04 0000 PCB IPN 220 01138 00 Bottom Side...

Страница 107: ...Bottom Side Test Points Options Connections Top Side Test Points Options Connections Bottom Side Receiver Overview Diagram Audio Processor Circuit Diagram IF Section Circuit Diagram Front End Circuit...

Страница 108: ...B6 3 2 T855 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 109: ...chanical assembly drawing The Parts List Amendments box below lists component changes that took place after the parts list and diagrams in this section were compiled These changes e g value changes ad...

Страница 110: ...CAP CER 0805 3P9 1 4P NPO 50V C324 20 015 21390 01 CAP CER 0805 3P9 1 4P NPO 50V C324 23 015 21390 01 CAP CER 0805 3P9 1 4P NPO 50V C324 25 015 21390 01 CAP CER 0805 3P9 1 4P NPO 50V C324 30 015 21390...

Страница 111: ...01 10000 99 S DIODE SMD BAV99 D SW SOT23 D260 001 10084 33 S DIODE ZEN SMD 0 3W 3V3SOT23 D270 001 10000 70 S DIODE SMD BAV70 D SW SOT23 D285 001 00011 70 S DIODE 1N4001 1A 50V D289 001 00011 70 S DIOD...

Страница 112: ...00E 5 R277 036 14560 00 RES M F 0805 5K6 5 R278 036 16220 00 RES M F 0805 220K 5 R280 036 16100 00 RES M F 0805 100K 5 R281 036 14470 00 RES M F 0805 4K7 5 R282 036 16100 00 RES M F 0805 100K 5 R284 0...

Страница 113: ...RES M F 0805 470E 5 R851 036 13470 00 RES M F 0805 470E 5 R852 036 14470 00 RES M F 0805 4K7 5 R853 036 13470 00 RES M F 0805 470E 5 R854 036 16330 00 RES M F 0805 330K 5 R855 036 15470 00 RES M F 080...

Страница 114: ...XTAL 45MHZ 7 5KHZ 2POLE XF302 10 276 00010 14 FLTR CER 455KHZ 15KHZ B W XF302 13 276 00010 76 FLTR CER 455KHZ 12KHZ B W XF302 15 276 00010 13 FLTR CER 455KHZ 9KHZ B W XF302 20 276 00010 14 FLTR CER 4...

Страница 115: ...IPN 220 01396 02 M850 00 T855 PCB Information B6 3 9 Copyright TEL 31 09 98...

Страница 116: ...ING A3M2378 DOUBLET H RES 311 01015 00 11 KNOB 15MM SKIRT 6MM SFT 312 01052 01 12 LID TOP PNTD A1M2364 T800 312 01053 01 13 LID BOTTOM PNTD A1M2364 T800 316 06622 00 14 PNL FRT RX T800 SERIES II 345 0...

Страница 117: ...M850 00 T855 PCB Information B6 3 11 Copyright TEL 31 09 98 replace A4 pages B6 3 11 B6 3 12 with A3 pages B6 3 11 B6 3 12...

Страница 118: ...B6 3 12 T855 PCB Information M850 00 31 09 98 Copyright TEL replace A4 pages B6 3 11 B6 3 12 with A3 pages B6 3 11 B6 3 12...

Страница 119: ...86 2 E4 3 J2 C388 2 E5 3 M2 C390 1 E6 3 M2 C392 2 E4 3 N2 C394 2 F3 3 P2 C410 2 L8 4 E4 C420 2 L8 4 F5 C430 2 L8 4 G6 C440 1 M7 4 H6 C450 2 K8 4 G5 C460 2 K8 4 H4 C470 2 G7 4 P5 C480 2 G8 4 Q5 C505 1...

Страница 120: ...9 Q320 2 F7 3 F5 Q330 2 E6 3 L5 Q340 2 E5 3 Q5 Q350 2 F4 3 D2 Q360 2 E3 3 F2 Q410 2 L8 4 G5 Q540 1 K5 5 K2 Q620 1 N6 6 P8 Q630 1 M6 6 P5 Q660 1 L5 6 N1 Q670 1 L6 6 Q2 Q750 1 G4 7 G3 Q760 1 G3 7 H3 Q77...

Страница 121: ...840 1 K3 8 P7 R841 1 K3 8 P7 R842 1 K3 8 P6 R843 1 K3 8 P6 R844 1 L2 8 M5 R845 1 L2 8 M5 R846 1 L4 8 L6 R847 1 L4 8 M6 R848 1 L4 8 Q5 R849 1 J2 8 Q5 R850 1 J2 8 Q4 R851 1 L4 8 Q4 R852 1 L2 8 N4 R853 1...

Страница 122: ...IPN 220 01396 02 B6 3 16 T855 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 123: ...is 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...

Страница 124: ...CII M850 00 31 09 98 Copyright TEL...

Страница 125: ...6 1 1 2 6 2 1 2 6 3 Specifications Introduction General RF Section Audio Processor Inputs Modulation Characteristics CTCSS Microcontroller Test Standards European Telecommunication Standard DTI CEPT R...

Страница 126: ...C1 2 T856 857 General Information M850 00 31 09 98 Copyright TEL...

Страница 127: ...M850 00 T856 857 General Information C1 3 Copyright TEL 31 09 98 replace A4 pages C1 3 C1 4 with A3 pages C1 3 C1 4...

Страница 128: ...C1 4 T856 857 General Information M850 00 31 09 98 Copyright TEL replace A4 pages C1 3 C1 4 with A3 pages C1 3 C1 4...

Страница 129: ...M850 00 T856 857 General Information C1 5 Copyright TEL 31 09 98 replace A4 pages C1 5 C1 6 with A3 pages C1 5 C1 6...

Страница 130: ...C1 6 T856 857 General Information M850 00 31 09 98 Copyright TEL replace A4 pages C1 5 C1 6 with A3 pages C1 5 C1 6...

Страница 131: ...m the audio processor Optional circuit blocks are an audio compressor and a pre emphasis stage They can be bypassed or linked to one or both audio inputs and then back into the remaining audio circuit...

Страница 132: ...thods 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 and f...

Страница 133: ...y Range 400 520MHz refer to Section 1 4 and Section 1 5 Modulation Type FM Frequency Increment 5 or 6 25kHz Switching Range 8MHz i e 4MHz from the centre frequency Load Impedance 50 ohms Frequency Sta...

Страница 134: ...Bm to 1GHz 47dBm 1GHz to 4GHz Conducted Spurious Emissions T856 Only Transmit 36dBm to 1GHz 30dBm 1GHz to 4GHz Standby 57dBm to 1GHz 47dBm 1GHz to 4GHz Power Output T856 Rated Power 25W see Duty Cycle...

Страница 135: ...within 1 2dB of a flat response ref 1kHz Distortion 2 Hum And Noise Wide Bandwidth 55dB 300Hz to 3kHz EIA typical Mid Bandwidth 55dB CEPT Narrow Bandwidth 50dB CEPT Compressor optional Attack Time 10...

Страница 136: ...219 October 1993 Radio equipment and systems land mobile service technical characteristics and test conditions for radio equipment transmitting signals to initiate a specific response in the receiver...

Страница 137: ...ct as follows T85X XX XXXX T855 receiver T856 25W transmitter T857 exciter T858 50W power amplifier T859 100W power amplifier Type The Type group uses two digits to indicate the basic RF configuration...

Страница 138: ...identify the transmitter type by checking the product code printed on a label on the rear of the chassis Figure 1 1 in Part A shows typical labels You can further verify the transmitter type by check...

Страница 139: ...nited States You can identify the exciter type by checking the product code printed on a label on the rear of the chassis Figure 1 1 in Part A shows typical labels You can further verify the exciter t...

Страница 140: ...C1 16 T856 857 General Information M850 00 31 09 98 Copyright TEL...

Страница 141: ...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 Page 2 1 I...

Страница 142: ...8 T856 High Level Block Diagram T857 High Level Block Diagram T856 857 Microcontroller Block Diagram T856 857 Synthesiser Block Diagram T856 857 Two Point Modulation T856 857 Audio Processor Block Dia...

Страница 143: ...n Section 6 2 T856 or 6 3 T857 for more detail Figure 2 1 T856 High Level Block Diagram Figure 2 2 T857 High Level Block Diagram Ramp Gen Time Delay Time Delay Time Delay Audio Processor Synthesiser 2...

Страница 144: ...ial 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 EPOT int...

Страница 145: ...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 incorpo...

Страница 146: ...rror 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 response...

Страница 147: ...e exciter drive amplifier A low level sniff is taken from the input to Q5 and used to drive the divider buffer for the synthesiser IC740 The VCO operates at the actual output frequency of the exciter...

Страница 148: ...nbalanced line and the other from a local microphone The microphone signal is passed first to a pre ampli fier Q210 and ultimately to a multiplexer IC240 but in between may pass through the compressor...

Страница 149: ...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 the...

Страница 150: ...a medium current capability 9V supply The T856 has a regulator IC370 which produces 9V for use in the exciter and audio circuits A switching power supply Q660 Q670 runs from the 9V supply and provide...

Страница 151: ...me 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 ha...

Страница 152: ...Cyclic keying control is provided by additional circuitry consisting of several time delay ramp and gate stages Q325 IC350 power ramping Q355 Q325 Tx Reg and Lock Detect gate Q335 Q340 Q345 delay and...

Страница 153: ...the RF signal at the input to the drive amplifier This is achieved by a PIN switch attenuator D201 D202 D203 Cyclic keying control is provided by additional circuitry consisting of several time delay...

Страница 154: ...C2 14 T856 857 Circuit Operation M850 00 31 09 98 Copyright TEL...

Страница 155: ...ise specified the term PGM800Win used in this and follow ing sections refers to version 2 00 and later of the software Refer to Figure 4 4 and Figure 4 4 which show the location of the main tuning and...

Страница 156: ...9 5 3 9 5 1 3 9 5 2 3 9 5 3 Audio Processor Two Point Modulation Modulator Adjustment Limiter Adjustment Line Level Without Compressor Compressor Compressor On Line Input Only Compressor On Microphon...

Страница 157: ...M800Win software package and an IBM PC You can also use PGM800Win to select the transmitter exciter s current operating frequency or default channel If the transmitter exciter is installed in a rack f...

Страница 158: ...nt set ups Figure 3 1 T856 857 Test Equipment Set up With T800 01 0010 Figure 3 2 T856 857 Test Equipment Set up Without T800 01 0010 or RF test set optional Frequency Counter Audio Voltmeter RF Power...

Страница 159: ...ser loop voltage Key the transmitter by earthing the Tx Key line Single Channel Tune VCO trimmer C6 for a synthesiser loop voltage of 10V Multichannel Tune VCO trimmer C6 for a synthesiser loop voltag...

Страница 160: ...output from the audio generator to obtain 3kHz 2 4kHz 1 5kHz deviation at 300Hz 3 Change the input frequency to 100Hz and adjust IC220 via PGM800Win refer ence modulation to obtain 3kHz 2 4kHz 1 5kHz...

Страница 161: ...and ensure that the maximum deviation does not exceed 4 7kHz 3 8kHz 2 3kHz Readjust IC220 if neces sary via PGM800Win deviation 3 4 6 Line in Level Adjustment Set the injected signal at the line input...

Страница 162: ...put 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 I J...

Страница 163: ...synthesiser loop voltage of 10V Multichannel Tune VCO trimmer C6 for a synthesiser loop voltage of 10V on the middle channel If there is no middle channel tune C6 so that the channels are symmetrical...

Страница 164: ...room temperature so that the NTC R481 is close to 25 C Key the transmitter by earthing the Tx Key line Tune CV475 until maximum power is obtained Check that the power exceeds 30W Adjust RV310 power co...

Страница 165: ...ulation 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 where...

Страница 166: ...kHz 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 IC220 if nec...

Страница 167: ...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 clip...

Страница 168: ...98 Copyright TEL 3 10 CTCSS Encoder Program a CTCSS tone on the set channel using PGM800Win Key the T856 857 with the front panel Carrier switch Adjust RV805 CTCSS level adjust to give 10 system devi...

Страница 169: ...sections refers to version 2 00 and later of the software Refer to Figure 4 4 and Figure 4 5 for the location of the main tuning and adjustment controls and to Section 3 3 for the test equipment set u...

Страница 170: ...C4 2 T856 857 Functional Testing M850 00 31 09 98 Copyright TEL...

Страница 171: ...suitable attenuation to the T856 857 output socket Key the T856 857 by earthing the Tx Key line Check that T856 the output power adjusts to 25W with RV310 power control turned fully clockwise T857 the...

Страница 172: ...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 173: ...ion 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 H...

Страница 174: ...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 foll...

Страница 175: ...ow Note A degraded signal to noise ratio can be expected with the compressor selected The extent of the degradation is dependent on the audio input level Line Input 600 ohms 3kHz 2 4kHz 1 5kHz deviati...

Страница 176: ...C4 8 T856 857 Functional Testing M850 00 31 09 98 Copyright TEL...

Страница 177: ...tact details are on page 2 Note 1 In this and following sections deviation settings are given first for wide bandwidth sets followed by settings in brackets for mid bandwidth sets and narrow bandwidth...

Страница 178: ...Serial Communications CTCSS Encode Regulator Synthesiser T856 Drive Amplifier T856 PA Power Control T857 Exciter Drive Amplifier Audio Processor 5 8 5 8 5 8 5 9 5 10 5 11 5 12 5 15 5 16 5 17 5 18 5 8...

Страница 179: ...ges 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 to the ca...

Страница 180: ...r 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 regulator output TP607 in the r...

Страница 181: ...the exciter output power SK310 is 1 5W 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...

Страница 182: ...PA by switching the supply to the exciter amplifier Q301 IC300 Q302 Q303 5 5 4 Audio And Modulation Refer to the audio processor fault finding chart Section 5 7 7 Set up the audio processor as describ...

Страница 183: ...ted 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 freque...

Страница 184: ...eck 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 IC8...

Страница 185: ...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 the pr...

Страница 186: ...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 at...

Страница 187: ...ox 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 present on Tx reg TP305 Replace Q610 Y N 0V present on Q860 collector Check Q860...

Страница 188: ...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 IC720 IC73...

Страница 189: ...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 5V w...

Страница 190: ...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 Q1 st...

Страница 191: ...egulators Check temp shutdown circuit N Y N Y N Y 10 5V on Q350 collector 10 5V on Q355 collector 13 8V on IC350 pin 8 11 5V on IC350 pin 7 N Check lock det path back to synth IC740 IC750 Q325 Check T...

Страница 192: ...eck drive at SK310 1 5W Check 13 8V at Q410 Q420 2V on IC350 pin 6 Turn RV310 ccw Check power drops to zero slowly in a controlled manner Does variation of RV310 cause either full power or no power Ch...

Страница 193: ...9V at Q305 collector Key exciter lock synthesiser Y N 9V at Q303 collector Y 4V present on IC300 pin 1 Check IC300 Check Q302 Q303 2V RF at VCO output N 1V RF at R323 N Y Check attenuator pad R517 R5...

Страница 194: ...k 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 6 7...

Страница 195: ...tors and transistor body to the nearest 0 5mm meas urement A in Figure 5 2 so that the capacitors can be replaced in exactly the same position These measurements are shown in Figure 5 2 for the 6LFL p...

Страница 196: ...or equivalent to the transistor mounting surface Sufficient compound should be used to ensure an even film over the entire mounting surface Place the transistor on the PCB in the correct orientation a...

Страница 197: ...ore information on anti static procedures when handling these devices This section provides the following information on the T856 transmitter and T857 exciter parts lists grid reference indexes mechan...

Страница 198: ...C6 1 2 T856 857 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 199: ...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 10 digit internal part number IPN e...

Страница 200: ...the Parts List Amendments box an example of which is shown below This box contains a list of component changes which took place after the parts list and dia grams in this section were compiled These c...

Страница 201: ...a component grid reference index to help you find components and labelled pads on the PCB layouts and circuit diagrams This index lists the components and pads in alpha numeric order along with the a...

Страница 202: ...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 end of the line to indicate where the rest o...

Страница 203: ...yout Bottom Side Test Points Options Connections Top Side Test Points Options Connections Bottom Side Transmitter Overview Diagram Audio Processor Circuit Diagram Exciter Circuit Diagram PA Circuit Di...

Страница 204: ...C6 2 2 T856 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 205: ...references are listed in IPN order Parts List Amendments C930 C960 400 440MHz 10 13 15 deleted to improve output power 710296 and 710359 IC710 Changed from 74HCV04 IPN 002 74910 04 to 74HC04 IPN 002 7...

Страница 206: ...10 X7R 50V C333 015 23150 01 CAP CER 0805 150P 5 NPO 50V C334 015 24100 08 CAP CER 0805 1N 10 X7R 50V C335 015 23150 01 CAP CER 0805 150P 5 NPO 50V C336 015 24470 08 CAP CER 0805 4N7 10 X7R 50V C337 0...

Страница 207: ...0 X7R 50V C740B 015 25100 08 CAP CER 0805 10N 10 X7R 50V C741A 014 07470 00 CAP TANT CHIP 4U7 3 5 X 2 8MM C741B 015 25100 08 CAP CER 0805 10N 10 X7R 50V C742A 015 06100 08 CAP CER 1206 100N 10 X7R 50V...

Страница 208: ...HOR 0 8MM L910 30 052 08145 15 COIL A W 1 5T 4 5MM HOR 0 8MM L910 35 052 08145 15 COIL A W 1 5T 4 5MM HOR 0 8MM L920 052 08150 15 COIL A W 1 5T 5 0MM HOR 0 8MM L930 10 052 08155 15 COIL A W 1 5T 5 5M...

Страница 209: ...R334 036 12680 00 RES M F 0805 68E 5 R335 036 12100 00 RES M F 0805 10E 5 R337 036 12100 00 RES M F 0805 10E 5 R338 036 13120 00 RES M F 0805 120E 5 R339 036 14100 00 RES M F 0805 1K 5 R341 036 16220...

Страница 210: ...R717 036 14270 00 RES M F 0805 2K7 5 R718 036 16150 00 RES M F 0805 150K 5 R719 036 16150 00 RES M F 0805 150K 5 R720 036 15390 00 RES M F 0805 39K 5 R721 036 15100 00 RES M F 0805 10K 5 R722 036 1510...

Страница 211: ...CK 1 3 PCB MT 64W SK504 240 04021 77 SKT JACK 1 3 PCB MT 64W SK505 240 04021 77 SKT JACK 1 3 PCB MT 64W SK513 240 04021 77 SKT JACK 1 3 PCB MT 64W SK522 240 04021 77 SKT JACK 1 3 PCB MT 64W SK531 240...

Страница 212: ...NTD 316 06621 00 13 PNL FRT TX T800 SERIES II 319 01173 00 15 SHIELD A3M2880 D RANGE T856 319 01174 00 16 SHIELD A4M2881 N CONN T856 345 00040 08 17 SCRW M3X12MM P POZ ST BZ 345 00040 10 18 SCRW M3X6M...

Страница 213: ...M850 00 T856 PCB Information C6 2 11 Copyright TEL 31 09 98 replace A4 pages C6 2 11 C6 2 12 with A3 pages C6 2 11 C6 2 12...

Страница 214: ...C6 2 12 T856 PCB Information M850 00 31 09 98 Copyright TEL replace A4 pages C6 2 11 C6 2 12 with A3 pages C6 2 11 C6 2 12...

Страница 215: ...3 C343 1 F3 3 J3 C344 1 F3 3 J4 C345 1 F3 3 K4 C346 1 F3 3 K4 C347 1 F3 3 L4 C348 1 F3 3 M4 C349 1 F3 3 M4 C350A 1 F7 3 J8 C350B 1 F7 3 J8 C351 1 F4 3 H1 C352 1 F4 3 J0 C353 1 F4 3 J0 C354 1 F4 3 K0 C...

Страница 216: ...5 L305 1 F5 3 P4 L310 1 F6 3 Q5 L315 1 F6 3 Q4 L320 1 F4 3 K2 L325 1 E4 3 K1 L330 1 E4 3 L1 L333 1 F3 3 H4 L334 1 F3 3 C0 L335 1 E4 3 M2 L340 1 E5 3 N2 L345 1 E5 3 P1 L350 1 E5 3 Q2 L355 1 E6 3 Q2 L40...

Страница 217: ...J6 5 J8 R502 1 J6 5 J8 R503 1 J6 5 K8 R504 1 K6 5 K9 R505 1 K6 5 L8 R510 1 K6 5 L8 R514 1 K6 5 N6 R515 1 H6 5 H5 R517 1 G5 5 F2 R518 1 G5 5 F3 R519 1 G5 5 G2 R520 1 K6 5 C1 R523 1 J5 5 D1 R525 1 J5 5...

Страница 218: ...9 SK805 1 K3 8 Q7 SK805 1 K3 8 Q6 SK805 1 K3 8 Q9 SK805 1 K3 8 Q6 SK805 1 K3 8 Q9 SK805 1 K3 8 Q7 SK805 1 K3 8 Q8 SK805 1 K3 8 Q6 SK805 1 K3 8 Q5 SK805 1 K3 8 Q7 SK805 1 K3 8 Q8 SK805 1 K3 8 Q7 SK805...

Страница 219: ...op Side PCB Layout Bottom Side Test Points Options Connections Top Side Test Points Options Connections Bottom Side Exciter Overview Diagram Audio Processor Circuit Diagram Exciter Circuit Diagram VCO...

Страница 220: ...C6 3 2 T857 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 221: ...anges added deleted components etc are listed by circuit reference in alphanumeric order and supersede the information given in the parts list or diagrams Components without circuit references are lis...

Страница 222: ...CER 0805 22P 5 NPO 50V C317 020 07470 04 CAP ELE RA 4M7 25V 20 8X13 SOL C318 015 24100 08 CAP CER 0805 1N 10 X7R 50V C319 015 24100 08 CAP CER 0805 1N 10 X7R 50V C320 015 24100 08 CAP CER 0805 1N 10 X...

Страница 223: ...00 S IC SMD AT24C16N 10SC EEPROM IC830 002 10003 24 S IC SMD 324 4X O AMP SO14 L300 065 00010 04 BEAD FERR F8 4X2X5MM L302 056 10330 02 L IND SMD 330NH L303 065 00010 04 BEAD FERR F8 4X2X5MM L305 056...

Страница 224: ...00 RES M F 0805 1K 5 R313 036 12220 00 RES M F 0805 22E 5 R314 036 13470 00 RES M F 0805 470E 5 R323 036 14150 00 RES M F 0805 1K5 5 R324 036 12470 00 RES M F 0805 47E 5 R325 036 13560 00 RES M F 0805...

Страница 225: ...805 150K 5 R818 036 14470 00 RES M F 0805 4K7 5 R819 036 14470 00 RES M F 0805 4K7 5 R821 036 15470 00 RES M F 0805 47K 5 R822 036 15470 00 RES M F 0805 47K 5 R824 036 14220 00 RES M F 0805 2K2 5 R825...

Страница 226: ...303 50074 00 7 CLIP A3M2246 SPRING CLAMP T857 303 50078 00 8 CLIP A4M2630 SPR CABLE CLAMP 308 01007 01 9 HANDLE BASE STATION SERIES II 312 01052 01 10 LID TOP PNTD A1M2364 T800 312 01053 01 11 LID BOT...

Страница 227: ...M850 00 T857 PCB Information C6 3 9 Copyright TEL 31 09 98 replace A4 pages C6 3 9 C6 3 10 with A3 pages C6 3 9 C6 3 10...

Страница 228: ...C6 3 10 T857 PCB Information M850 00 31 09 98 Copyright TEL replace A4 pages C6 3 9 C6 3 10 with A3 pages C6 3 9 C6 3 10...

Страница 229: ...503 1 K6 5 L9 C505 1 K6 5 M6 C510 1 J5 5 C0 C513 1 H5 5 G2 C535 1 K5 5 M2 C550 1 K4 5 L0 C605 1 L6 6 D8 C610A 1 M5 6 F8 C610B 1 M5 6 G8 C611A 1 L5 6 H8 C611B 1 M5 6 J8 C623 1 M6 6 N8 C625 1 M6 6 Q8 C6...

Страница 230: ...3 7 K8 Q720 1 J3 7 K8 Q730 1 H3 7 N8 Q740 1 H3 7 N8 Q750 1 G4 7 F3 Q760 1 H3 7 H3 Q770 1 H3 7 H1 Q775 1 H3 7 K3 Q780 1 H3 7 K3 Q785 1 H3 7 K2 Q790 1 H4 7 L3 Q795 1 G3 7 P0 Q810 1 M2 8 E7 Q820 1 L2 8 D...

Страница 231: ...M2 8 D7 R802 1 M2 8 D7 R808 1 L2 8 B4 R809 1 L2 8 D5 R810 1 L2 8 D6 R811 1 L2 8 E6 R812 1 L2 8 D5 R813 1 L2 8 D4 R815 1 L2 8 F4 R816 1 L2 8 F4 R818 1 M2 8 F5 R819 1 M2 8 F5 R821 1 M4 8 B3 R822 1 M4 8...

Страница 232: ...IPN 220 01398 02 C6 3 14 T857 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 233: ...mplifiers This part of the manual is divided into five sections as listed below There is a detailed table of contents at the start of each section Section Title 1 General Information 2 Circuit Operati...

Страница 234: ...DII M850 00 31 09 98 Copyright TEL...

Страница 235: ...n Section Title Page 1 1 Introduction 1 7 1 2 1 2 1 1 2 2 1 2 3 1 2 3 1 1 2 3 2 1 2 3 3 Specifications Introduction General Test Standards European Telecommunication Standard DTI CEPT Recommendation T...

Страница 236: ...D1 2 T858 859 General Information M850 00 31 09 98 Copyright TEL...

Страница 237: ...M850 00 T858 859 General Information D1 3 Copyright TEL 31 09 98 replace A4 pages D1 3 D1 4 with A3 pages D1 3 D1 4...

Страница 238: ...D1 4 T858 859 General Information M850 00 31 09 98 Copyright TEL replace A4 pages D1 3 D1 4 with A3 pages D1 3 D1 4...

Страница 239: ...M850 00 T858 859 General Information D1 5 Copyright TEL 31 09 98 replace A4 pages D1 5 D1 6 with A3 pages D1 5 D1 6...

Страница 240: ...D1 6 T858 859 General Information M850 00 31 09 98 Copyright TEL replace A4 pages D1 5 D1 6 with A3 pages D1 5 D1 6...

Страница 241: ...itters enhanced reliability if one of the two output stages fails the transmitter can still produce one quarter of its rated power VSWR and thermal protection are incorporated into the basic design wh...

Страница 242: ...n be obtained from Tait Electronics Ltd 1 2 2 General Power Output T858 Rated Power 50W Range Of Adjustment 10 to 60W typical T859 Rated Power 100W Range Of Adjustment 20 to 105W typical Input Power 1...

Страница 243: ...accordance with the following standards 1 2 3 1 European Telecommunication Standard ETS 300 086 January 1991 Radio equipment and systems land mobile service technical characteristics and test conditio...

Страница 244: ...Recommendation T R 24 01 Annex I 1988 Technical characteristics and test conditions for radio equipment in the land mobile service intended primarily for analogue speech Annex II 1988 Technical chara...

Страница 245: ...ct as follows T85X XX XXXX T855 receiver T856 25W transmitter T857 exciter T858 50W power amplifier T859 100W power amplifier Type The Type group uses two digits to indicate the basic RF configuration...

Страница 246: ...this manual was published Consult your nearest Tait Dealer or Customer Service Organisation for more information You can identify the PA type by checking the product code printed on a label on the re...

Страница 247: ...show the location of the main adjustment controls The following topics are covered in this section Section Title Page 2 1 Introduction 2 3 2 2 RF Circuitry 2 4 2 3 2 3 1 2 3 2 2 3 3 2 3 4 2 3 5 2 3 6...

Страница 248: ...D2 2 T858 859 Circuit Operation M850 00 31 09 98 Copyright TEL...

Страница 249: ...ive control circuitry Figure 2 1 shows the configuration of each of the main circuit blocks on a functional level while the fold outs Figure 1 1 and Figure 1 2 show their location on the PCB L19 L39 L...

Страница 250: ...na socket via the harmonic filter The diplexer presents the final amplifiers with a good load at harmonic frequencies which helps to achieve the expected harmonic attenuation in the output filter The...

Страница 251: ...Reverse Power Alarm Forward Power Meter Forward Power Alarm 7V 7V Tx Key IC1a RV48 RV43 Q16 Q15 Q10 13 8V Filtered Integrator IC1c Control Supply t R72 NTC RV63 RV69 Power Control Shutdown Power Leve...

Страница 252: ...ltage of power control error amplifier IC1c which in turn limits the maximum supply voltage that can be applied to driver Q4 by power control transistor Q16 Note T859 PAs with serial numbers prior to...

Страница 253: ...e Power Metering Forward and reverse power signals from the two IC3 buffers are available for metering purposes The output currents are adjustable via RV43 forward power and RV57 reverse power 2 3 6 T...

Страница 254: ...emperature drops below 10 C Q21 is turned off preventing either Q19 or Q20 from activating the fan Fan operation may be summarised as follows T 10 C fan unconditionally turned off 10 C T 70 C fan turn...

Страница 255: ...4 which show the location of the main adjustment controls 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 3 3 1 3 3 2...

Страница 256: ...D3 2 T858 859 Initial Adjustment M850 00 31 09 98 Copyright TEL...

Страница 257: ...up 3 2 Preliminary Checks Check for short circuits between the positive rail and earth Set up the test equipment as in Figure 3 1 Connect the T858 859 to a 13 8V DC supply Check that the quiescent cu...

Страница 258: ...clockwise Key on the drive source T859 Only Adjust CV1 for maximum output Adjust CV8 for maximum output Adjust CV32 for maximum output Adjust CV51 and CV57 for maximum output Adjust CV34 and CV35 for...

Страница 259: ...ncy Retune CV32 CV51 and CV57 towards maximum capacitance to obtain minimum supply current but do not exceed a maximum drop of 0 5A per control Check that the supply current is T858 12A for 50W output...

Страница 260: ...leads if you wish to carry out the adjustment procedures with the T858 859 withdrawn from the rack in the latched position Alternatively disconnect and withdraw the T858 859 and reconnect it behind th...

Страница 261: ...he desired level For continuous opera tion during fault conditions set the shutdown power to 20W Adjust RV69 so that the voltage at IC1 pin 13 is 380mV 3 6 T859 High Temperature Shutdown Power Level N...

Страница 262: ...ration Section 3 7 and Section 3 8 before setting the alarm levels 3 9 1 Forward Power Power up the T858 859 and adjust RV63 front panel power control so that the output power is at the alarm level re...

Страница 263: ...djustment D3 9 Copyright TEL 31 09 98 Example A VSWR of 3 1 can be simulated by connecting an unterminated 3dB pad to the PA output This will result in a return loss of 6dB Note Remote indication is a...

Страница 264: ...D3 10 T858 859 Initial Adjustment M850 00 31 09 98 Copyright TEL...

Страница 265: ...help from Customer Support Radio Systems Division Tait Elec tronics Ltd Christchurch New Zealand full contact details are on page 2 Refer to Section 5 where the parts lists grid reference index and di...

Страница 266: ...D4 2 T858 859 Fault Finding M850 00 31 09 98 Copyright TEL...

Страница 267: ...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 to the catastrophic nature of most...

Страница 268: ...oblems with the power control circuitry refer to the Power Control Fault Finding Charts Section 4 6 2 or Section 4 6 4 as appropriate 4 4 2 PA Faults If a PA fault has occurred or is suspected it is e...

Страница 269: ...M850 00 T858 859 Fault Finding D4 5 Copyright TEL 31 09 98 replace A4 pages D4 5 D4 6 with A3 pages D4 5 D4 6 Figure 4 1 T858 859 Test Break Point Location...

Страница 270: ...D4 6 T858 859 Fault Finding M850 00 31 09 98 Copyright TEL replace A4 pages D4 5 D4 6 with A3 pages D4 5 D4 6...

Страница 271: ...th Fluke 77 DVM supply voltage 13 8V at socket transmitter unkeyed allow 20 for spread of transistor characteristics Device Emitter Base Collector Q1 Q3 Q4 Q6 Q7 Q11 Q13 Q15 Q16 0 0V 0 0V 0 0V 0 0V 0...

Страница 272: ...F present at base of Q3 Check for Unelco shorts at base or around chips Check CV8 Check Q3 collector 13V Check Q16 Q15 Check IC1 pin 8 is high 12V Check input voltages on IC1 pin 10 Q4 output power 20...

Страница 273: ...voltages from directional coupler Check IC3 pins 7 1 Check Q10 Q11 Check IC1 pin 1 12V DC when forward power low Does forward power alarm output work Does reverse power alarm output work Check Q12 Q1...

Страница 274: ...reline L19 Q7 Check for shorts on Q6 base CV35 CV51 Check wireline L19 Q6 Replace lead 2 of L19 Remove leads 2 4 of wireline L39 and replace with flying leads one to a wattmeter one to a 50 ohm load o...

Страница 275: ...ck IC3 pins 7 1 Check Q10 Q11 Check IC1 pin 1 12V DC when forward power low Does forward power alarm output work Does reverse power alarm output work Check Q12 Q13 Check IC1 pin 7 12V DC when reverse...

Страница 276: ...ircuit stop the fan Spray freeze on R116 OR short R113 Check IC3 pin 14 11V Check Q21 Q20 N N Y Y Check Q20 Q21 collector voltages Check Q17 Q18 Check IC3 pin 14 1V Check Q19 Check Tx key is low at gr...

Страница 277: ...and transistor body to the nearest 0 5mm meas urement A in Figure 4 2 so that the capacitors can be replaced in exactly the same position These measurements are shown in Figure 4 2 for the 6LFL packag...

Страница 278: ...nd Dow Corning 340 or equivalent to the transistor mounting surface Sufficient compound should be used to ensure an even film over the entire mounting surface Place the transistor on the PCB in the co...

Страница 279: ...ring the D range connector and PCB to the heatsink and withdraw the assembly and wires from the heatsink cutting cable ties as required Remove the transistor stud nuts and mounting screws In the T859...

Страница 280: ...he order of removal taking care that the wiring is cor rectly positioned and not pinched Q1 Q3 Only Torque down the retaining nut to the correct torque 0 7Nm 6lb in Make sure that the heatsink compoun...

Страница 281: ...o Section 1 2 in Part A for more information on anti static procedures when handling these devices This section provides the following information on the T858 and T859 power amplifiers parts lists gri...

Страница 282: ...D5 1 2 T858 859 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 283: ...internal part number IPN e g 220 01390 02 which is screen printed onto the PCB usually on the top side as shown in the example below The last 2 digits of this number define the issue status which sta...

Страница 284: ...the Parts List Amendments box an example of which is shown below This box contains a list of component changes which took place after the parts list and dia grams in this section were compiled These c...

Страница 285: ...fix such as or before the circuit reference e g R100 Grid Reference Index This section contains a component grid reference index to help you find components and labelled pads on the PCB layouts and ci...

Страница 286: ...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 end of the line to indicate where the rest o...

Страница 287: ...ontains the following information IPN Section Page 220 01141 01 Parts List Mechanical Miscellaneous Parts Mechanical Assembly Grid Reference Index PCB Layout Bottom Side PCB Layout Top Side RF Section...

Страница 288: ...D5 2 2 T858 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 289: ...820 02 to 10p 89 06 341 Mid Band changed from 3p3 015 01330 02 to 3p9 Case Mica type 89 08 460 C62 Low Band changed from 3p3 015 01330 02 to 3p9 89 07 411 C63 C65 Low Band changed from 10p 029 02100 0...

Страница 290: ...IPN 220 01141 01 D5 2 4 T858 PCB Information M850 00 31 09 98 Copyright TEL Parts List Amendments Continued This page is provided for entering future amendments to the Parts List...

Страница 291: ...IP 10N 10 X7R 50V C93 015 23150 01 CAP CER 0805 CHIP 150P 5 NPO 50V C95 015 06100 08 CAP CER 1206 CHIP 100N 10 X7R 50V C96 015 23150 01 CAP CER 0805 CHIP 150P 5 NPO 50V C97 015 23150 01 CAP CER 0805 C...

Страница 292: ...805 CHIP 1M 5 R56 036 15100 00 RES M F 0805 CHIP 10K 5 RV57 042 05470 09 RES PRESET 50K CERMET 9 5MM SQ FLAT R58 036 14470 00 RES M F 0805 CHIP 4K7 5 R61 036 13220 00 RES M F 0805 CHIP 220E 5 R62 036...

Страница 293: ...IPN 220 01141 01 M850 00 T858 PCB Information D5 2 7 Copyright TEL 31 09 98...

Страница 294: ...8 01007 01 32 HANDLE BASE STATION SERIES II 308 13085 01 4 HSINK DIECAST T858 50W PA 308 13086 00 19 HSINK A3M2271 2MM W LINE PA 316 06617 00 31 PNL PA NO INP DRV SER II SNGL 316 85018 00 26 PIN A4M13...

Страница 295: ...IPN 220 01141 01 M850 00 T858 PCB Information D5 2 9 Copyright TEL 31 09 98 replace A4 pages D5 2 9 D5 2 10 with A3 pages D5 2 9 D5 2 10...

Страница 296: ...IPN 220 01141 01 D5 2 10 T858 PCB Information M850 00 31 09 98 Copyright TEL replace A4 pages D5 2 9 D5 2 10 with A3 pages D5 2 9 D5 2 10...

Страница 297: ...L3 C111 1 W10 2 A7 C112 1 V9 2 B5 C113 1 V3 2 N4 D1 1 F6 1 M5 D2 1 E9 1 N4 D3 1 T2 2 A2 D5 1 W9 2 C7 D6 1 U2 2 G6 2 G6 D10 1 W10 2 C5 D11 1 W9 2 D5 D13 1 R2 2 F3 2 F3 D17 1 V3 2 N4 2 M4 IC1 1 U5 2 H1...

Страница 298: ...IPN 220 01141 01 D5 2 12 T858 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 299: ...ontains the following information IPN Section Page 220 01159 01 Parts List Mechanical Miscellaneous Parts Mechanical Assembly Grid Reference Index PCB Layout Bottom Side PCB Layout Top Side RF Section...

Страница 300: ...D5 3 2 T859 PCB Information M850 00 31 09 98 Copyright TEL...

Страница 301: ...hanged from 100p 015 03100 02 to 33p To eliminate instability improve power out 90 01 023 Mid Hi Bands changed from 100p 015 03100 02 to 22p To eliminate instability improve power out 90 01 023 C23 Lo...

Страница 302: ...inate instability improve power out 90 01 023 R69 10e added To eliminate instability improve power out 90 01 023 R70 220e added To eliminate instability improve power out 90 01 023 R81 1k deleted To e...

Страница 303: ...015 21390 01 CAP CER 0805 CHIP 3P9 0 25P NPO 50V C70 HI 015 21390 01 CAP CER 0805 CHIP 3P9 0 25P NPO 50V C70A 015 06100 08 CAP CER 1206 CHIP 100N 10 X7R 50V C72 015 24470 08 CAP CER 0805 CHIP 4N7 10...

Страница 304: ...17100 00 RES M F 0805 CHIP 1M 5 R42 036 15100 00 RES M F 0805 CHIP 10K 5 RV43 042 05470 09 RES PRESET 50K CERMET 9 5MM SQ FLAT R44 036 14470 00 RES M F 0805 CHIP 4K7 5 R47 036 16100 00 RES M F 0805 C...

Страница 305: ...IPN 220 01159 01 M850 00 T859 PCB Information D5 3 7 Copyright TEL 31 09 98...

Страница 306: ...858 50W PA 308 13086 00 19 HSINK A3M2271 2MM W LINE PA 316 06651 00 37 PNL PA NO INP DRV SER II DBL 316 85018 00 27 PIN A4M1397 COAX CONDUCTOR 319 01147 00 3 SHIELD A3M2224 WALL T859 PA 319 01148 00 3...

Страница 307: ...IPN 220 01159 01 M850 00 T859 PCB Information D5 3 9 Copyright TEL 31 09 98 replace A4 pages D5 3 9 D5 3 10 with A3 pages D5 3 9 D5 3 10...

Страница 308: ...IPN 220 01159 01 D5 3 10 T859 PCB Information M850 00 31 09 98 Copyright TEL replace A4 pages D5 3 9 D5 3 10 with A3 pages D5 3 9 D5 3 10...

Страница 309: ...P1 C114 1 V10 2 A8 C115 1 V9 2 A4 C116 1 V3 2 N1 C117 1 W5 2 P8 C118 1 V4 2 P8 C119 1 U4 2 P7 C120 1 U4 2 P6 C121 1 V4 2 P5 C122 1 V4 2 P5 C123 1 T5 2 Q7 C124 1 U5 2 Q7 C125 1 T5 2 R8 C126 1 U3 2 N6...

Страница 310: ...2 J9 R99 1 T4 2 H4 R100 1 U5 2 L2 R101 1 W8 2 M2 R102 1 U2 2 N8 R103 1 U2 2 N6 R104 1 U4 2 P7 R105 1 U3 2 N7 R106 1 U4 2 P7 R107 1 U4 2 P6 R108 1 W4 2 N8 R109 1 V3 2 P9 R110 1 U3 2 M5 R111 1 U3 2 M4 R...

Страница 311: ...B Information This part of the manual provides the parts list PCB layouts and circuit diagram for the T850 VCO PCB There is a detailed table of contents at the start of Section 2 Section Title IPN Pag...

Страница 312: ...EII M850 00 31 09 98 Copyright TEL...

Страница 313: ...sts The 10 digit numbers 000 00000 00 in this Parts List are internal part numbers IPNs We can process your spare parts orders more efficiently and accurately if you quote the IPN and provide a brief...

Страница 314: ...e information given in the parts list or diagrams Components without circuit references are listed in IPN order The number in brackets at the end of each entry refers to the Tait internal Change Order...

Страница 315: ...Information E2 1 Copyright TEL 31 09 98 2 T850 VCO PCB This section contains the following information IPN Section Page 220 01145 02 Parts List PCB Layout Bottom Side PCB Layout Top Side Circuit Diag...

Страница 316: ...E2 2 T850 VCO PCB Information M850 00 31 09 98 Copyright TEL...

Страница 317: ...ts List Amendments box below lists component changes that took place after the parts list and diagrams in this section were compiled These changes e g value changes added deleted components etc are li...

Страница 318: ...35 COIL A W 3 5T 3 5MM HOR 0 8MM WIRE PL2 240 00025 36 PLUG 32WAY 1ROW PC MTG HARWIN PL3 240 00025 36 PLUG 32WAY 1ROW PC MTG HARWIN PL4 240 00025 36 PLUG 32WAY 1ROW PC MTG HARWIN PL5 240 00025 36 PLU...

Страница 319: ...T850 VCO PCB IPN 220 01145 02 Bottom Side Copyright TEL 31 09 98 IPN 220 01145 02 M850 00 T850 VCO PCB Information E2 5...

Страница 320: ...IPN 220 01145 02 E2 6 T850 VCO PCB Information M850 00 31 09 98 Copyright TEL T850 VCO PCB IPN 220 01145 02 Top Side...

Страница 321: ...1 2 1 2 2 2 1 2 2 2 3 2 4 T856 857 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 T858 859 Installation Rack Mounting Rack Wiring...

Страница 322: ...I M850 00 31 09 98 Copyright TEL 3 1 3 2 3 3 3 4 T800 45 0001 PA Guide Kit T858 859 Chassis Connectors T858 859 PA In Latched Position T858 859 D Range Wiring Rear View 3 1 3 1 3 1 3 1 Figure Title Pa...

Страница 323: ...Mute Selection Receiver Disable CTCSS Configuration 300Hz High Pass Filter Audio Processor Links General Audio Processor Linking Details For CTCSS 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 2 1 2 1 3 2 2 1 2 1 1 2...

Страница 324: ...hrough Repeater Basic Configuration Remote Line Controlled Base Station 4 Wire to 2 Wire Converter Receiver Disable Time vs Tail Time DC Loop Keying With Common Earth Isolated Constant Current Loop Cu...

Страница 325: ...applications 1 3 Mute Selection Link PL250 may be set to operate with noise mute or carrier mute refer to Section 1 7 1 4 Receiver Disable The receiver audio can be disabled by pulling the RX DISABLE...

Страница 326: ...ackets Plug Linka a The letters in this column and in the table in Section 1 7 2 below refer to the identification letters screen printed onto the PCB beside each set of pins Function PL210 1 2 2 3 A...

Страница 327: ...iltered 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 speech injected back into...

Страница 328: ...G1 4 T855 Link Selectable Features M850 00 31 09 98 Copyright TEL...

Страница 329: ...ings are shown in brackets Plug Linka a The letters in this column and in the table in Section 2 1 2 below refer to the identification letters screen printed onto the PCB beside each pair of pins Func...

Страница 330: ...uitry may be completely isolated from the rest of the system by means of the optocoupler IC250 connected between pins 11 and 12 of the D range connector A constant current source Q270 allows keying vo...

Страница 331: ...is fitted the exciter may be keyed via the TX ENB OPT pad in the audio processor The line must be pulled low to key 2 7 Transmit Key Time Refer to the appropriate test points options connections drawi...

Страница 332: ...G2 4 T856 857 Optional Features M850 00 31 09 98 Copyright TEL...

Страница 333: ...o modu late the carrier The receiver and transmitter operate simultaneously and must therefore be on different frequencies The minimum frequency separation depends on the duplexer used Figure 3 1 Talk...

Страница 334: ...G3 2 Talk Through Repeater M850 00 31 09 98 Copyright TEL...

Страница 335: ...o prevent the receiver mute opening from RF due to lack of isolation in the relay direct radiation or the noise skirt of the dual frequency link Since the base station may be controlled via a 2 wire l...

Страница 336: ...timer the changeover relay must be driven from the relay driver Q250 in the audio processor rather than by Tx Key or Tx Enable this output is available on pin 9 of the T800 03 000 auxiliary D range D...

Страница 337: ...DC Loop Keying With Common Earth Where the receiver and transmitter or remote control are distant DC loop keying is provided by an isolated supply driver and detector because an earth cannot be relied...

Страница 338: ...M850 00 31 09 98 Copyright TEL Figure 5 3 Isolated Loop Current Switch Figure 5 4 Typical System O O O O O SW SW Isolated Supply Unit 1 Unit 2 Long Line Det Optional bridge to protect against polarity...

Страница 339: ...h T800 Series II equipment For a comprehensive list of available ancillary equipment please contact your nearest Tait Dealer or Customer Service Organisation Section Page Programming Kits 1 General An...

Страница 340: ...HII M850 00 31 09 98 Copyright TEL...

Страница 341: ...0 Series II modules to be read or programmed while in the rack frame It can also connect to the programming socket on the T800 01 0004 programming module interface if the module is to be read or progr...

Страница 342: ...II module via D range 1 without the need to construct cus tom wiring looms The T800 01 0010 also has a built in speaker a switch for selecting Series I or II modules and uses standard BNC and banana...

Страница 343: ...range plug assembly for mounting directly on a PCB T800 Series II blank front panel complete with handle Custom designed PCBs for special applications can be mounted in several positions inside the ch...

Страница 344: ...monitor the basic operational func tions of one T800 receiver and transmitter The meter and selector switches for monitor ing the required functions are mounted on the front panel as is the monitor s...

Страница 345: ...ned for use with 66 to 88MHz equipment Refer to the T800 Ancillary Equipment Service Manual for more information T800 32 0000 T800 32 0010 DFSK Modulators The T800 32 0000 and T800 32 0010 are DFSK mo...

Страница 346: ...connect to a T800 Series II module fitted with a T800 06 0000 kit The other end is terminated with a BNC connector which can be mounted on the rack frame T801 00 Frequency Reference Module The T801 0...

Страница 347: ...e T800 22 0000 but is supplied packed flat in disas sembled form for ease of transport The wiring loom and backplane PCB are however supplied complete and ready for installation T800 22 0002 The T800...

Страница 348: ...standard 483mm rack frame The kit contains a front panel complete with speaker programming port an options tray for mounting a power supply duplexer etc and a wiring loom to connect the two T800 modul...

Страница 349: ...mounting screws T800 41 0003 The T800 41 0003 rack frame guide is designed to fit into a T800 Series II rack frame and will accept three T800 Series II modules except for power supplies and power amp...

Страница 350: ...or Customer Service Organisation for more details about T300 T1500 Series compatibility with T800 Series II rack frames T800 43 0001 The T800 43 0001 is the same as the T800 43 0000 but is supplied wi...

Страница 351: ...e T800 50 0001 is similar in function and design to the T800 50 0000 but is designed to allow connection of TA087 or TA387 channel select panels It has one 25 way OEM D range connector but will not ac...

Страница 352: ...ge and one 11 way D range incorporating a miniature RF connector T800 19 0000 Rack Mounting Fan The T800 19 0000 fan is designed to fit into the base of any standard 483mm rack frame without affecting...

Страница 353: ...magnetic circuit breaker The circuit breaker also functions as an on off switch to control the supply of power to the rack frame The T800 17 0010 is intended primarily for use with rack frames powered...

Страница 354: ...15V 60Hz nominal values which can be internally selected with a switch The T807 10 0000 is designed to power T800 Series II 50W transmitters plus receivers etc and requires a T800 44 0000 guide to fit...

Страница 355: ...ion in a T800 Series I rack frame Section Title Page 1 Tools Required 1 1 2 2 1 2 2 T855 856 857 SII SI Conversion Introduction Method 2 1 2 1 2 2 3 3 1 3 2 T858 859 SII SI Conversion Introduction Met...

Страница 356: ...I II M850 00 31 09 98 Copyright TEL...

Страница 357: ...for M3 screws No 2 for M4 screws Torx Screwdrivers T10 for M3 screws T20 for M4 screws Spanners 1 4 AF for D range locating pins 5 5mm AF for M3 nutsa 6mm AF for SMC connector 7mm AF for M4 nuts a If...

Страница 358: ...I1 2 Tools Required M850 00 31 09 98 Copyright TEL...

Страница 359: ...st Tait Dealer or Customer Service Organisation before beginning the procedure It should take approximately 15 20 minutes per module to perform these steps Mechanical These changes involve putting on...

Страница 360: ...both covers from the module 3 Remove the M3 screws spring washers and M3 nuts from D range 1 Note If you have a chassis with threaded holes you will need to remove only the M3 screws and spring washer...

Страница 361: ...6 P238 P240 P242 P244 P246 P248 P250 P252 P254 P256 P258 P260 P263 P266 P268 P270 P280 P282 P284 P287 P810 P815 P820 P825 P830 P835 P840 PL100 PL210 PL220 PL230 PL240 PL250 PL260 PL270 Q310 Q540 Q620...

Страница 362: ...R160 10 place R150 10 Continue with Step 8 If you are modifying a T857 follow these steps refer to Figure 2 2 remove R808 10 remove R160 10 place R150 10 remove L314 this will disable cyclic keying t...

Страница 363: ...P170 P204 P208 P215 P217 P219 P225 P230 P231 P233 P235 P237 P239 P240 P243 P244 P245 P247 P248 P249 P251 P255 P257 P259 P261 P263 P267 P269 P271 P273 P275 P805 P810 P820 P825 P830 P835 P840 PL100 PL2...

Страница 364: ...nel following Step 1 in reverse order Note If you have difficulty refitting the LEDs try pushing the body of the LED back into the grommet with a thin screw driver or spike Be very careful while doing...

Страница 365: ...857 SII SI Conversion I2 7 Copyright TEL 31 09 98 Figure 2 3 T857 RF Output Coax Routing Fit the coax as shown securing it in the groove in the chassis with the spring clip Remove this spring clip an...

Страница 366: ...I2 8 T855 856 857 SII SI Conversion M850 00 31 09 98 Copyright TEL...

Страница 367: ...e already purchased the appropriate Series I conver sion kit T858 T800 70 0058 T859 T800 70 0059 If not you should purchase one from your nearest Tait Dealer or Customer Service Organisation before be...

Страница 368: ...the chassis from which the BNC connector has been removed replace any cable ties previously cut and ensure the wiring is secured under the restraints provided Fit the front panel SMC connector insert...

Страница 369: ...M850 00 T858 859 SII SI Conversion I3 3 Copyright TEL 31 09 98 Figure 3 1 T858 859 Front RF Input Coax Routing T859 Shown...

Страница 370: ...I3 4 T858 859 SII SI Conversion M850 00 31 09 98 Copyright TEL...

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