Tait T800 SL2 25W Service Manual Download Page 83

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M8SL2-00-002-812

T855 Fault Finding

B5.17

5.7.5

Carrier Mute

Approx. 5V on

RSSI pad 238?

Approx. 5V on

IC280 pin 1?

Check/replace IC280

& adjoining components.

Check Q230, Q245 &

Q290 for operation.

Adjust RV235 &
observe voltage

on IC280 pin 6.

Switch SW201

(monitor mute) to ensure

mute is enabled.

Does "Gate" LED

toggle on/off?

Refer to

receiver fault
finding chart.

Voltage varies

0-6V?

Check 9V rail &

resistors R275,

R277 & RV235.

Set 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.

Monitor voltage on

IC270 pin 7. Switching

0-8V as RV235 rotated?

Check/replace

IC270 & D240.

Monitor voltage on

pad 234. Switching

0-8V as RV235 rotated?

Replace Q250.

Does "Gate"
LED toggle?

Check/replace
Q255 & D250.

Mutable audio

on outputs?

Refer to audio

fault finding chart.

Note:

c/w = clockwise
cc/w = counterclockwise
or anticlockwise

Rotate RV235

(carrier mute) c/w & cc/w

& view "Gate" LED.

Apply on channel signal

@ -110dBm* to receiver.

Audio on

TP314?

*Modulated by 1kHz signal with
±3kHz (±2.4kHz) [±1.5kHz] deviation.

Approx. 2V at

D-Range 1 pin 5?

Ensure PL250 is set

for carrier mute operation,

and the RSSI PCB is fitted.

Check for short circuits

and/or replace IC310.

Check Q340 and

adjoining components.

Summary of Contents for T800 SL2 25W

Page 1: ...M8SL2 00 002 812 1 Copyright Tait Electronics Limited August 2004 All rights reserved T800 SL2 Base Station Equipment 400 to 520MHz 25 Watt Continuous Service Manual August 2004 M8SL2 00 002 812...

Page 2: ...Unit 2216 North Tower Concordia Plaza No 1 Science Museum Road Tsim Sha Tsui East Kowloon Phone 852 2369 3040 Fax 852 2369 3009 E mail hongkong taitworld com Beijing Tait Mobile Radio HK Ltd Beijing...

Page 3: ...Electronics Ltd Christchurch New Zealand full contact details are on page 2 Updating Equipment and Manuals In the interests of improving performance reliability or servicing Tait Electronics Ltd rese...

Page 4: ...002 812 Copyright Tait Electronics Limited August 2004 All rights reserved Publication Information T800 SL2 Service Manual Publication Date Product Code June 2002 August 2004 M8SL2 00 001 812 M8SL2 0...

Page 5: ...the model type and options fitted according to the conventions described below You can identify the unit s type by checking the product code printed on a label on the rear of the chassis Figure 1 1 i...

Page 6: ...lk Cabinet Transportable 6U Blk Tone Remote Module T992 03 0002 T992 04 0002 T992 06 0002 T803 00 0000 0 1 2 No Duplexer Fitted 50 Watt Duplexer Kit T991 09 0001 T993 XX Coaxial Relay Kit T800 09 0002...

Page 7: ...elow 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 T855 Receiver C T854...

Page 9: ...wer Transistors 1 1 1 1 1 1 1 2 1 2 2 2 1 2 2 2 3 2 3 1 2 4 Mechanical Torx Recess Head Screws Pozidriv and Philips Recess Head Screws Disassembly Reassembly Receivers Transmitters Cover Screw Torques...

Page 11: ...gure 1 1 Typical Product Code and Serial Number Labels If you require information about a particular PCB please quote the full PCB internal part number IPN which is screen printed onto the top side of...

Page 12: ...e to the transmitter output power stage 1 4 Caution Beryllium Oxide and Power Transistors The RF power transistors in current use all contain some beryllium oxide This sub stance while perfectly harml...

Page 13: ...the chances of screw 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 ang...

Page 14: ...ew head This can 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 th...

Page 15: ...or change option links you need to remove only the top cover i e the one on the opposite side to the main D range connector D range 1 PL100 You need to remove the bottom cover to access transmitter R...

Page 17: ...Start the suction and 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...

Page 18: ...an approved Tait Dealer or Customer Service Organisa tion equipped with the necessary facilities Repairs attempted with incorrect equipment or by untrained personnel may result in perma nent damage I...

Page 19: ...T855 Receiver This 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 Ope...

Page 21: ...1 Introduction 1 5 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 CTCSS Mute Operation Mi...

Page 23: ...Identification 1 2 3 4 5 C 6 8 9 A B 7 10 Key 1 2 3 4 5 6 7 low pass filter receiver front end receiver IF audio processor VCO regulators synthesiser 8 9 10 A B C microcontroller and CTCSS duct for ca...

Page 24: ...the mute threshold is received Gating Sensitivity Sets the RF signal level required to open the mute gate and allow audio to pass to the output Supply LED The Supply LED is lit when DC power is suppli...

Page 25: ...the optional T800 04 0000 RSSI PCB is fitted The audio section output can be adjusted to deliver 10dBm to a 600 balanced out put and 1W to a local monitor speaker A flat or de emphasised audio respon...

Page 26: ...ards 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 bandw...

Page 27: ...Current Standby 350mA Full Audio 800mA Operating Temperature Range 20 C to 60 C 1 2 3 RF Section Frequency Range 400 to 530MHz Type dual conversion superheterodyne Frequency Increment 5 or 6 25kHz Sw...

Page 28: ...e emphasised Flat RF Level 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 minim...

Page 29: ...table to 10dBm Load Impedance 600 Distortion at 70dBm signal level De emphasised Flat Wide Bandwidth 2 2 Mid and Narrow Bandwidth 2 4 Monitor Output Power 1W Speaker Impedance 4 Distortion 3 at 70dBm...

Page 30: ...nking 2 25mA via 2k2 Vds max 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 Januar...

Page 31: ...speech 1 2 6 2 DTI CEPT 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...

Page 33: ...agrams 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 Noise Mu...

Page 35: ...xer synthesised local 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 dia...

Page 36: ...410 The signal is then passed 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...

Page 37: ...te 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 XF300 which is matched into 50 on both its input...

Page 38: ...iometer 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 mut...

Page 39: ...of IC260 is fed into a line transformer to provide a balanced 2 wire or 4 wire 600 output The speaker volume is set using the front panel Monitor Volume knob RV205 and the line level is set using the...

Page 40: ...of the synthesiser cir cuitry It is also used as the reference for a DC amplifier IC640 Q630 and Q620 which provides a medium current capability 9V supply A switching power supply based on Q670 and Q...

Page 41: ...M 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 PGM800Win p...

Page 42: ...00 is buffered IC710 and divided 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 th...

Page 43: ...ilitate tuning The VCO output is coupled into a cascode amplifier stage Q2 and Q3 which supplies 10dBm nominal output Further amplifi cation in Q5 brings the output drive level to 20dBm to drive the m...

Page 44: ...T800 04 0000 RSSI PCB The 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 const...

Page 45: ...herwise specified the term PGM800Win used in this and follow ing sections refers to version 4 02 and later of the software Refer to Figure 4 3 which shows the location of the main tuning and adjustmen...

Page 46: ...IF 3 10 3 8 Gating Delay 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...

Page 47: ...You can program up to 128 channel frequencies into the receiver s EEPROM memory IC820 by using the PGM800Win software package and a PC You can also use PGM800Win to select the receiver s current oper...

Page 48: ...st Equipment Set up For Short Tuning Procedure Figure 3 2 T855 Test Equipment Set up For Full Tuning and Adjustment Procedure or RF test set optional not needed for short tuning procedure Receiver RF...

Page 49: ...loop voltage Single Channel Tune VCO 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 middl...

Page 50: ...t RV310 noise mute gain fully clockwise to close the mute if necessary turn off the RF signal and then turn it on again Rotate RV310 anticlockwise until the mute just opens Reset the signal generator...

Page 51: ...r 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 and 2 linked G H high pass filter bypassed...

Page 52: ...ation you require You should 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 tabl...

Page 53: ...hum and noise 45dB high pass filtered speech 400Hz to 3kHz internal CTCSS detection hum and noise 30dB with 250 3Hz tone present external CTCSS detection decoding performed through the receiver but e...

Page 54: ...Hz The TCXO IC700 output frequency should be trimmed when the IF is tuned Refer to Section 3 7 3 7 Alignment Of Receiver Front End And IF Note In this and following sections deviation settings are giv...

Page 55: ...pin 3 RSSI 455kHz input and connect plugs PL210 and PL220 to give a flat audio response refer to Section 3 5 Readjust L310 L320 L330 L340 L350 L360 L370 and L380 to give a maximum amplitude response o...

Page 56: ...fully clockwise to close the mute if necessary turn off the RF signal and then turn it on again Rotate RV310 anticlockwise until the mute just opens Reset the signal generator for the required openin...

Page 57: ...peaker Output Adjust RV205 front panel monitor volume to give an output of 2Vrms into a 4 resistive load Check for any clipping or distortion on the oscilloscope Switch to a 4 speaker and adjust RV205...

Page 58: ...ne 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 measurement A 3 13 RSSI The T800 04 000...

Page 59: ...rsion 4 02 and later of 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...

Page 61: ...nt is less than 800mA Reset 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 o...

Page 62: ...05 front panel monitor volume to give 2Vrms into a 4 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...

Page 63: ...gure 4 1 T855 De emphasised 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 Freq...

Page 64: ...sinad Caution Some RF generators 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...

Page 65: ...l Mute RSSI Fitted and Carrier 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 che...

Page 66: ...nt Controls FL410 FL420 C6 L1 L340 RV310 L320 noise mute gain RV220 RX DISABLE PL210 PL260 PL250 PL220 PL240 RV230 gating sensitivity RV210 line level RV205 monitor volume SW201 monitor mute SK320 pin...

Page 67: ...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 sets Note 2...

Page 68: ...5 7 1 3 5 7 2 5 7 3 5 7 4 5 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...

Page 69: ...e 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 catastro...

Page 70: ...sing a DMM monitor the VCO control 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 no...

Page 71: ...y is poor you can trace the 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...

Page 72: ...utput Check that an audio 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 maximu...

Page 73: ...earities refer to Figure 5 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 linea...

Page 74: ...base station because a channel 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 o...

Page 75: ...7 1 1 Basic Checks Pulsing 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...

Page 76: ...nd a POLL command to 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 circui...

Page 77: ...re there 5V square waves 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 Q84...

Page 78: ...g components short circuits 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 Replace IC630 Check R615 Replace IC610 Check continu...

Page 79: ...shorts etc N Y Replace VCO 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 pres...

Page 80: ...frequency adjust as 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...

Page 81: ...ty or poor residual FM 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...

Page 82: ...eck Q230 Q245 Q290 for operation 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 R...

Page 83: ...ge 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 replace IC270 D240 N Y Monitor voltage on pad 234 Switching 0 8...

Page 84: ...Y N Y N Y N Y N Y Y Y Ensure 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 stag...

Page 85: ...ing sensitivity fully clockwise Gate LED on Refer to mute fault finding charts Y N N Y N Y N Y Audio on speaker Audio on C238 C259 Audio on IC240 pin 2 IC260 pin 2 Replace C249 check continuity Audio...

Page 87: ...1 2 in Part A 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 mechan...

Page 89: ...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 digit internal part...

Page 90: ...rder Variant Components 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 va...

Page 91: ...vertical 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...

Page 93: ...yright Tait Electronics Limited August 2004 All rights reserved 6 2 T800 04 0000 RSSI PCB This section contains the following information IPN Section Page 220 01138 03 Parts List PCB Layout Top Side P...

Page 95: ...05 1n 10 X7r 50v D1 001 10000 99 Diode SMD BAV99 D Sw SOT23 IC1 002 10003 24 IC SMD 324 4x 0 Amp S014 Q1 002 10033 46 IC SMD MC3346D Xst Aray S014 R3 036 14100 10 Res M F SMD 0805 1k 1 R4 036 14220 00...

Page 97: ...0000 PCB IPN 220 01138 03 Top Side Copyright Tait Electronics Limited August 2004 All rights reserved IPN 220 01138 03 M8SL2 00 002 812 T800 04 0000 RSSI PCB Information B6 2 5 220 01138 03 A 220 011...

Page 98: ...12 Copyright Tait Electronics Limited August 2004 All rights reserved T800 04 0000 PCB IPN 220 01138 03 Bottom Side BBADMARK C1 C2 C3 C4 C5 C6 C7 C8 C9 D1 IC1 P1 P2 Q1 R10 R11 R12 R13 R14 R15 R16 R17...

Page 99: ...05 99 2A ECO 740091 MJ TB M HALL M HALL JACKSON 24 06 99 3A ECO 770177 M HALL C1 1N0 C2 1N0 C3 330P C4 10N C5 1N0 C6 10N C7 4N7 C8 10N C9 1N0 D1 BAV99 2 3 D1 BAV99 3 1 IC1 LM324D V 11 V 4 IC1 LM324D 3...

Page 101: ...ayout Top Side PCB Layout Bottom Side Test Points and Options Connections Top Side Test Points and Options Connections Bottom Side Receiver Overview Diagram Audio Processor Circuit Diagram IF Section...

Page 103: ...AP CER 0805 8P2 1 4P NPO 50V C318 15 015 21820 01 CAP CER 0805 8P2 1 4P NPO 50V C318 20 015 21820 01 CAP CER 0805 8P2 1 4P NPO 50V C318 23 015 21820 01 CAP CER 0805 8P2 1 4P NPO 50V C318 25 015 21820...

Page 104: ...6 CAP METAL POLY 100N 10 100V C776 015 24680 08 CAP CER 0805 6N8 10 X7R 50V C782 015 23120 01 CAP CER 0805 120P 5 NPO 50V C784 015 23120 01 CAP CER 0805 120P 5 NPO 50V C786 015 06100 08 CAP CER 1206 1...

Page 105: ...180 00 RES M F 0805 18K 5 R209 30 036 15220 00 RES M F 0805 22K 5 R209 35 036 15180 00 RES M F 0805 18K 5 R210 036 15150 00 RES M F 0805 15K 5 R211 036 15390 00 RES M F 0805 39K 5 R213 036 14270 00 RE...

Page 106: ...5 R760 036 13180 00 RES M F 0805 180E 5 R762 036 13100 00 RES M F 0805 100E 5 R763 036 13100 00 RES M F 0805 100E 5 R765 036 13680 00 RES M F 0805 680E 5 R766 036 14100 00 RES M F 0805 1K 5 R767 036...

Page 107: ...HZ 14KHZ BW 2 P XF301 15 276 00010 54 FLTR XTAL 45MHZ 7 5KHZ 2POLE XF301 20 276 00010 56 FLTR XTAL 45MHZ 14KHZ BW 2 P XF301 23 276 00010 56 FLTR XTAL 45MHZ 14KHZ BW 2 P XF301 25 276 00010 54 FLTR XTAL...

Page 109: ...ll rights reserved T855 Mechanical Assembly 220 01396 03 Key The upper number is the component identification number which appears in the Legend column of the Mechanical and Miscellaneous Parts on the...

Page 111: ...E4 3 C1 C372 2 F3 3 E1 C374 2 F3 3 D3 C376 2 E3 3 E2 C378 2 F3 3 E2 C380 2 E3 3 F2 C382 1 F3 3 G3 C384 2 E4 3 H2 C386 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...

Page 112: ...L260 1 C8 2 H3 PL270 1 C2 2 L1 Q210 2 C6 2 J8 Q220 2 C5 2 M6 Q230 2 C5 2 N6 Q240 2 C8 2 H4 Q245 2 B6 2 J4 Q250 2 B8 2 G2 Q255 2 B7 2 H2 Q260 2 B7 2 K0 Q270 2 C2 2 K0 Q280 2 B7 2 L2 Q290 2 B6 2 M2 Q310...

Page 113: ...L7 R828 1 K4 8 L7 R829 1 K4 8 P9 R830 1 K3 8 P9 R831 1 K3 8 P9 R832 1 K3 8 P8 R833 1 K3 8 P8 R835 1 K3 8 P8 R836 1 K3 8 P8 R837 1 K3 8 P7 R840 1 K3 8 P7 R841 1 K3 8 P7 R842 1 K3 8 P6 R843 1 K3 8 P6 R8...

Page 115: ...238 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 PL200 PL210 PL220 PL230 PL240 PL250 PL260 PL270 Q310 Q540 Q6...

Page 116: ...D260 D270 D310 D350 L410 L430 Q210 Q220 Q230 Q240 Q245 Q250 Q255 Q260 Q270 Q280 Q290 Q320 Q330 Q340 Q350 Q360 Q410 R201 R204 R205 R207 R210 R211 R213 R215 R218 R221 R222 R224 R225 R227 R229 R230 R232...

Page 117: ...2 812 T855 PCB Information B6 3 17 Copyright Tait Electronics Limited August 2004 All rights reserved T855 Test Points and Options Connections Top Side 220 01396 03 The darker shading shows the outlin...

Page 118: ...55 PCB Information M8SL2 00 002 812 Copyright Tait Electronics Limited August 2004 All rights reserved T855 Test Points and Options Connections Bottom Side 220 01396 03 The darker shading shows the fo...

Page 119: ...ATCHDOG NOT RESET HARMONIC FILTER SHEET 9 ANTENNA F END SIG OUT OF CIRCUIT DATA SHEET 10 9V 9V 9V 5V 5V 5VDIG 9V PL100 LINE O P 1 1 PL100 LINE O P 2 2 PL100 LINE O P 3 3 PL100 LINE O P 4 4 PL100 RSSI...

Page 120: ...3 1 CW RV205 10K 1 3 2 CW RV235 10K 2 3 1 R264 27K R265 100 R269 2K2 R266 22K R204 10K R205 220K R267 330K R207 8K2 R210 15K R280 100K R281 4K7 R211 39K R282 100K R288 4K7 R213 2K7 R242 100 R285 47K R...

Page 121: ...0 R316 47 R318 10K R378 100K R380 10K R320 3K9 R382 47K R384 47K R322 8K2 R323 10K R326 10K R324 22K R386 12K T R390 10K R392 0 R332 330 R388 10K R328 1K0 R330 47 R302 39E R395 0 R304 2K7 R338 1K0 R33...

Page 122: ...3 02 02 99 03B T855RX BENC 1V0 0V28 4V3 C410 1P8 C420 47P C450 47P C430 100P C440 10U C470 10P C480 56P FL410 HELICAL FILTER 1 3 2 FL420 HELICAL FILTER 1 3 2 L420 330N L440 330N R405 0 R410 0 R415 330...

Page 123: ...6 03 02 02 99 03B T855RX BENC SK505 1 WAY SOCKET RF OUT SK504 1 WAY SOCKET GND SK503 1 WAY SOCKET GND SK502 1 WAY SOCKET GND SK501 1 WAY SOCKET GND SK535 1 WAY SOCKET 9V VCO SK534 1 WAY SOCKET GND SK5...

Page 124: ...K8 R653 10K R693 100K R685 15K R696 56K R641 1K5 R645 470 T610 650 2 3 6 1 4 VREG IC610 78L05 VIN 3 GND 1 VOUT 2 C611A 100U C610B 100U C610A 10N C611B 10N R617 0 C658 100N BAV70 D640 2 3 BAV70 D640 1...

Page 125: ...756 470K C759 10N C764 10N TANT C765 4U7 R766 1K0 R765 680 R760 180 R758 1K2 C761 10N TANT C762 22U C767 1N0 R769 180 R762 100 R771 8K2 R763 100 TANT C770 22U TANT C772 22U C769 1N0 R774 8K2 R772 22K...

Page 126: ...R879 100K C842 1U0 C844 1U0 C846 1U0 C848 1U0 R891 100K IC850 LM324D 10 9 8 IC850 LM324D 3 2 1 IC850 LM324D 12 13 14 IC850 LM324D 5 6 7 R892 330K BAV70 D860 2 3 R889 100K R890 150K R898 470K R897 10K...

Page 127: ...ARMONIC FILTER 1396_03B 220 01396 03 02 02 99 03B T855RX BENC A A K SOT23 DIODES K A KA SOT23 DIODES K K A SOT23 DIODES B E C SOT23 PNP B E C SOT23 NPN TO 92 PNP B C E TO 92 FET S G D TO 126 PNP E C B...

Page 129: ...854 Transmitter This 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 Op...

Page 131: ...tion Title Page 1 1 Introduction 1 5 1 2 1 2 1 1 2 2 1 2 3 1 2 4 1 2 4 1 1 2 4 2 1 2 4 3 1 2 5 1 2 6 1 2 6 1 1 2 6 2 1 2 6 3 Specifications Introduction General RF Section Audio Processor Inputs Modul...

Page 133: ...k Identification Key 1 2 3 4 5 6 7 low pass filter PA exciter drive amplifier audio processor VCO regulators synthesiser 8 9 10 A B C microcontroller and CTCSS duct for cabling to extra D range if fit...

Page 134: ...itting Carrier Switch Keys the transmitter while disabling the 600 line and microphone audio Supply LED The Supply LED is lit when DC power is supplied to the transmitter Line Sensitivity Sets the gai...

Page 135: ...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 circuitry in...

Page 136: ...tandards 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 b...

Page 137: ...le in 10 second steps 1 2 3 RF Section Frequency Range 400 to 520MHz Modulation Type FM Frequency Increment 5 or 6 25kHz Switching Range 8MHz i e 4MHz from the centre frequency Load Impedance 50 Frequ...

Page 138: ...tomer Service Organisation Stability 3 1 VSWR all phase angles Radiated Spurious Emissions Transmit 36dBm to 1GHz 30dBm 1GHz to 4GHz Standby 57dBm to 1GHz 47dBm 1GHz to 4GHz Conducted Spurious Emissio...

Page 139: ...dB octave pre emphasis characteristic Flat Response within 1 2dB of output at 1kHz Above Limiting Response within 1 2dB of a flat response ref 1kHz Distortion 2 max Hum And Noise Wide Bandwidth 55dB 3...

Page 140: ...the transmission of data and speech and having an antenna connector ETS 300 219 October 1993 Radio equipment and systems land mobile service technical characteristics and test conditions for radio equ...

Page 141: ...detailed information 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 S...

Page 142: ...erved Figure Title Page 2 1 2 3 2 4 2 5 2 6 2 7 2 8 T854 High Level Block Diagram T854 Microcontroller Block Diagram T854 Synthesiser Block Diagram T854 Two Point Modulation T854 Audio Processor Block...

Page 143: ...rmed as an 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 2 for more detail Figur...

Page 144: ...erial 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 i...

Page 145: ...phase shifting stage IC720 pins 3 and 4 Q730 Q740 before being divided down to 6 25kHz or 5kHz within the synthesiser IC IC740 A buffered output of the VCO Q795 is divided with a prescaler and program...

Page 146: ...esponse of the loop to VCO modulation is shown by f2 in Figure 2 4 below To achieve low frequency modulation the reference oscillator is also modulated so that the phase detector of IC740 detects no f...

Page 147: ...ivers 20dBm typically to the 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 outpu...

Page 148: ...m a 600 balanced or 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 th...

Page 149: ...ting the feedback loop The compression level is set by adjustment of the comparator threshold RV220 Note Although the high dynamic range of the compressor allows the use of very low audio signal level...

Page 150: ...audio circuits 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 synthesiser loop filter IC750 giving a VCO control...

Page 151: ...l Sets the tail time during which the transmitter stays keyed after the exter nal key source has been removed 0 to 5 seconds in 20ms steps Transmit Timeout Sets the maximum continuous trans mission ti...

Page 152: ...ock Detect gate Q335 Q340 Q345 delay and PIN switch drive This is to allow the RF power circuits both exciter and PA to ramp up and down in a controlled manner so that minimal adjacent channel interfe...

Page 153: ...cs Limited August 2004 All rights reserved The RF output from the exciter is fed to the driver stage Q410 and then to the final Q420 DC is fed to the final via a low pass filter with special low frequ...

Page 155: ...adjustment Note Unless otherwise specified the term PGM800Win used in this and follow ing sections refers to version 4 02 and later of the software Refer to Figure 4 4 which show the location of the...

Page 156: ...Adjustment Line Level Without Compressor Compressor Compressor On Line Input Only Compressor On Microphone Input Only Compressor On Both Line and Microphone Inputs 3 11 3 11 3 11 3 12 3 12 3 13 3 13...

Page 157: ...28 channel frequencies into the transmitter s EEPROM memory IC820 by using the PGM800Win software package and a PC You can also use PGM800Win to select the transmitter s current operating frequency or...

Page 158: ...2 show typical test equipment set ups Figure 3 1 T854 Test Equipment Set up With T800 01 0010 Figure 3 2 T854 Test Equipment Set up Without T800 01 0010 or RF test set optional Frequency Counter Audio...

Page 159: ...ynthesiser 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...

Page 160: ...00Win to copy the value to the other channels Note 4 If you are using an RF test set turn the low pass filter off and set the high pass filter to 15kHz before beginning this procedure 1 Inject an audi...

Page 161: ...channel and use this value for all other channels with the EPOT Fill option in PGM800Win Inject 1kHz at 10dBm into the line input D range 1 PL100 pins 1 and 4 pins 2 and 3 shorted refer to Section 1 5...

Page 162: ...cted microphone pre amp output to compressor input microphone pre amp output to multiplexer input 7 8 9 10b 11 12 13 14 D E F G pre emphasis output to multiplexer input pre emphasis output to limiter...

Page 163: ...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 voltage of 10V on the middle channel If there is no mid...

Page 164: ...necessary 3 Turn RV310 power control fully clockwise 4 Key the transmitter by earthing the Tx Key line 5 Tune CV475 until maximum power is obtained Check that the power exceeds 30W 6 Adjust RV310 powe...

Page 165: ...ettings in PGM800Win This allows the two point modulation and deviation settings to be adjusted for each chan nel Note 3 To optimise the modulation response across the switching range repeat steps 1 t...

Page 166: ...eviation as per Section 3 9 4 3 9 4 Limiter Adjustment Note If the T854 will be used over the whole 8MHz switching range you must set the deviation for each channel However if the module will be used...

Page 167: ...ssor On Line Input Only 1 Set RV210 line sensitivity fully clockwise and key the transmitter by earthing the Tx Key line 2 Reduce the line level to 50dBm at 1kHz and set RV220 compression level fully...

Page 168: ...h Line and Microphone Inputs Set up as described in Section 3 9 6 1 3 10 Power Alarms if used When fitted to the T854 transmitter an alarm board monitors the transmitter output power and generates a l...

Page 169: ...T1500 52 0000 Alarm PCB and mounting screws D range and PCB interface 3 10 1 1 Installation To install this kit you will require the following tools T1500 52 0000 Tx alarm Multi channel alarm kit Phil...

Page 170: ...ection pads T1500 52 0000 PCB connection pads Rear D range pin number and PCB label Wire colour 9V P230 9V Red GND P259 GND Black Fwd Pwr TP T826 R302 via end T836 TP310 T854 T856 TP306 Fwd Volts Gree...

Page 171: ...nt at the top Carrier button end Note Take care not to knock the T1500 52 0000 PCB while the covers are off A sharp knock on the SMD electro capacitors will damage the board 7 Fit a ribbon cable if mu...

Page 172: ...reverse power alarm as appropriate The plug in board also includes channel select switches that enables the user to manually set the operational channel of the T854 The plug in board provides the same...

Page 173: ...smitter 2 The auxiliary D Range board is connected to the microcontroller cavity by a rib bon cable Remove the ribbon cable 3 For T854 transmitters with a serial number of 13098764 or earlier These tr...

Page 174: ...plug in board so that the double sided tape bonds to the top of the microcontroller 7 Connect the ribbon cable between J2 on the plug in board and the auxiliary D Range board 3 10 2 2 T800 10 0520 Tes...

Page 175: ...iate valued open ended attenuator This should generate the desired return loss reflected power for the desired high reverse power alarm threshold point 5 Key up the transmitter 6 Adjust RV1 the revers...

Page 177: ...ecified the term PGM800Win used in this and follow ing sections refers to version 4 02 and later of the software Refer to Figure 4 4 for the location of the main tuning and adjustment controls and to...

Page 179: ...r On LED should light 5 Adjust RV310 power control to obtain 25W output power 6 Check that the current is less than 5 5A 4 2 Output Power 1 Connect an RF power meter with suitable attenuation to the T...

Page 180: ...ts the tail time during which the transmitter stays keyed after the exter nal key source has been removed 0 to 5 seconds in 20ms steps Transmit Timeout Sets the maximum continuous trans mission time O...

Page 181: ...Note The limits shown on these graphs should not be exceeded 1 If you are using an RF test set turn off all filters 2 Measure the pre emphasis response as follows Reduce the line level to give 1kHz 0...

Page 182: ...e same shape as the wide bandwidth graph The devia 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...

Page 183: ...2k 3k 10k Frequency Hz 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 t...

Page 184: ...better than those specified below 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...

Page 185: ...2004 All rights reserved Figure 4 4 T854 Main Tuning and Adjustment Controls R481 CV475 C6 L1 RV320 shutdown RV210 line sensitivity SW230 carrier IC700 TCXO L481 RV310 power control RV220 compression...

Page 187: ...urch New Zealand full contact 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...

Page 188: ...Charts Microcontroller Basic Checks Serial Communications CTCSS Encode Regulator Synthesiser T854 Drive Amplifier T854 PA and Power Control Audio Processor 5 7 5 7 5 7 5 8 5 9 5 10 5 11 5 14 5 15 5 16...

Page 189: ...dium or low resistance 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 operat...

Page 190: ...d 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 regula...

Page 191: ...e transmitter Check that 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...

Page 192: ...ser s manual for a complete list of error messages Channel Switch Set The programmed default channel change was not accepted by the base station because a channel is selected externally Try turning th...

Page 193: ...7 1 1 Basic Checks Pulsing 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...

Page 194: ...d a POLL command to 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 circuit...

Page 195: ...select a channel Check 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...

Page 196: ...660 is switching at approx 150kHz N Y 20V present on TP603 Check R615 Replace IC610 N Y Key Tx Y Regulators OK N 8 8V present on Tx reg TP305 Replace Q610 Y N 0V present on Q860 collector Check Q860 a...

Page 197: ...N N N Y Y 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 5V reg supply resistor to each IC 5V present at IC7...

Page 198: ...utput pins IC740 pins 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 Q78...

Page 199: ...ors Q1 Replace if faulty 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...

Page 200: ...supplies Check regulators Check temp shutdown circuit N Y N Y N Y 3 3V on Q337 collector 13 6V on Q336 collector 11 5V on IC350 pin 7 N Check lock det path back to synth IC740 IC750 Q325 Check TP305...

Page 201: ...LP filter 10 8V at L310 Check 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 eithe...

Page 202: ...C720 pins 9 3 synth 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...

Page 203: ...istance between the capacitors 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...

Page 204: ...ply a small amount of heatsink compound 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 Plac...

Page 205: ...atic charges Refer to 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 T854 transmitter parts lis...

Page 207: ...function of this resistor is to indicate the product type It has no effect on the circuitry or operation of the transmitter PCB Identification All PCBs are identified by a unique 10 digit internal pa...

Page 208: ...rder Variant Components 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 va...

Page 209: ...vertical 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...

Page 211: ...CB Layout Top Side PCB Layout Bottom Side Test Points and Options Connections Top Side Test Points and Options Connections Bottom Side Transmitter Overview Diagram Audio Processor Circuit Diagram Exci...

Page 213: ...AP CER 0805 150P 5 NPO 50V C277 015 25100 08 CAP CER 0805 10N 10 X7R 50V C279 015 24100 08 CAP CER 0805 1N 10 X7R 50V C281 015 25220 08 CAP CER 0805 22N 10 X7R 50V C283 015 21470 05 CAP CER 0805 4P7 0...

Page 214: ...445 26 029 02330 02 CAP MICA 5MM CASE 33P 5 C445 30 029 02330 02 CAP MICA 5MM CASE 33P 5 C445 35 029 02330 02 CAP MICA 5MM CASE 33P 5 C445 36 029 02330 02 CAP MICA 5MM CASE 33P 5 C450 015 03100 02 CAP...

Page 215: ...500VGRM42 C940 20 015 01470 06 CAP CER 1210 4P7 NPO500VGRM42 C940 23 015 01470 06 CAP CER 1210 4P7 NPO500VGRM42 C940 25 015 01470 06 CAP CER 1210 4P7 NPO500VGRM42 C940 26 015 01470 06 CAP CER 1210 4P7...

Page 216: ...T COAX N TYPE PNL MTG OPNTRM PL100 070 01001 00 DRNG 15WAY CMPLT T800 PL201 240 00021 03 HDR 2X7W SMD PL202 240 00021 03 HDR 2X7W SMD Q100 000 10029 55 XSTR SMD MJD2955 PNP 20W Q101 000 10008 17 XSTR...

Page 217: ...0 10 RES M F SMD 0805 1K 1 R303 036 15100 10 RES M F SMD 0805 10K 1 R304 036 15470 10 RES M F SMD 0805 47K 1 R305 036 15330 10 RES M F SMD 0805 33K 1 R306 036 16100 10 RES M F SMD 0805 100K 1 R307 036...

Page 218: ...10000 00 RES M F SMD 0805 0E 0 125W R706 036 15150 10 RES M F SMD 0805 15K 1 R707 036 16100 10 RES M F SMD 0805 100K 1 R708 036 16470 00 RES M F SMD 0805 470K 5 R709 036 12100 10 RES M F SMD 0805 10E...

Page 219: ...0K CER 4MM SQ RV805 042 05200 05 RES PRE SMD 20K CER 4MM SQ SK200 240 10000 05 CONN SMD 8W 2R SKT M MATCH SK205 240 02020 05 SKT STEREO PH JACK PCB MTG SK310 240 02100 44 SKT COAX MINI ANGLED PCB MTG...

Page 220: ...0 08 2 FAN 12V 119 X 119 X 25 PAPST 302 05204 00 3 BRKT A3M2314 F THRU MTG T859 302 05258 00 4 BRKT FAN INTAKE 25W T800 PA 302 05259 00 5 BRKT FAN MTG 25W CONN T800 PA 303 11226 00 CHASS 25W CONN T800...

Page 223: ...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 E1 C352 1 F4 3 F0 C353 1 F4 3 G0 C354 1 F4 3 G0 C355 1 F4 3 G1...

Page 224: ...1 J2 7 D8 IC710 1 J2 7 C6 IC710 1 J2 7 D7 IC710 1 J2 7 D5 IC710 1 J2 7 E6 IC710 1 J2 7 C5 IC710 1 J2 7 D6 IC720 1 H3 7 N6 IC720 1 H3 7 J0 IC720 1 H3 7 M7 IC720 1 H3 7 L7 IC720 1 H3 7 K7 IC720 1 H3 7 E...

Page 225: ...H1 R329 1 E3 3 J2 R330 1 E8 3 H9 R331 1 F4 3 H1 R332 1 F4 3 H1 R334 1 F3 3 B1 R336 1 E3 3 M2 R337 1 F5 3 Q2 R338 1 F9 3 B5 R339 1 E7 3 B5 R340 1 E7 3 B4 R340C 1 F8 3 M9 R341 1 F7 3 D4 R342 1 E5 3 N3...

Page 226: ...M4 8 L1 R873 1 N3 8 M1 R874 1 N3 8 L0 R875 1 N3 8 M0 R876 1 N3 8 L0 R877 1 N2 8 K2 R879 1 N2 8 J2 R880 1 M4 8 J6 R881 1 M4 8 L6 R882 1 M2 8 K3 RV210 1 B7 2 G3 RV220 1 A4 2 P6 RV320 1 E8 3 F3 RV330 1...

Page 227: ...170 P204 P208 P215 P217 P219 P225 P230 P231 P233 P235 P237 P239 P240 P245 P249 P251 P255 P257 P259 P261 P263 P267 P269 P271 P273 P275 P290 P291 P805 P810 P820 P825 P830 P835 P840 PL100 PL201 PL202 Q10...

Page 228: ...imited August 2004 All rights reserved T854 PCB Layout Bottom Side 220 01686 03 E C D B K A P L M N J H G F Q 1 2 3 4 5 6 7 8 9 BOTFIDA BOTFIDB BOTHOLE BOTSLOT C930 C960 TAIT ELECTRONICS T854 XX 7XXX...

Page 229: ..._CNTRL VOLT P245 TX REG P219 P805 COMPRESSION LEVEL LOCK DETECT TP710 9V TP300 4V1 TP501 P257 P810 10 8 6 2 4 9 7 5 3 1 TP601 TP206 9V POCR SUPPLY LED P215 P160 LED AN GND TX LED 4V1 TP603 LPF OUT P23...

Page 230: ...2 20 T854 PCB Information M8SL2 00 002 812 Copyright Tait Electronics Limited August 2004 All rights reserved T854 Test Points Options Connections Bottom Side 220 01686 03 E C D B K A P L M N J H G F...

Page 231: ...SDA SCK SYNTH REF MOD 9V 5V 20V LOCK DETECT DIV BUFFER CNTRL VOLT TX REG MICRO SHEET 8 SYNTH SCK SERIAL COM SDA SDAP SCKP REV FWD HARMONIC FILTER SHEET 9 ANTENNA GND FILTER C100 150P C101 47U C103 1N0...

Page 232: ...SDA SCK SYNTH REF MOD 9V 5V 20V LOCK DETECT DIV BUFFER CNTRL VOLT TX REG MICRO SHEET 8 SYNTH SCK SERIAL COM SDA SDAP SCKP REV FWD HARMONIC FILTER SHEET 9 ANTENNA GND FILTER C100 150P C101 47U C103 1N0...

Page 233: ...70N R287 10K R291 0 C289 47N R299 2K7 C293 1U0 R297 5K6 TANT C291 22U R290 560E R293 47K R294 4K7 IC260 LM324D G3 G3 G3 O P R295 2K7 R292 4K7 IC260 LM324D G1 G1 G1 O P R267 2K2 R266 47K 1 R265 15K C26...

Page 234: ...0K R372 6K8 R374 1K2 TANT C372 4U7 C373 100N R361 68 C343 1N0 L333 M21A R373 820 C333 150P R334 68 L334 M21A R338 120 L302 M21A TP310 C313 150P C315 150P C327 150P TP312 C383 150P C385 150P TP320 R340...

Page 235: ...0P C485 150P C490 150P C496 150P C499 150P C420 150P C493 100P R450 30E R480 100E R470 100E R490 4K7 R460 4K7 SK410 SIDE ENTRY COAX SKT TP401 Q410 SD1433 L418 PRINTED L440 PRINTED Q420 SD1488 L455 PRI...

Page 236: ...807 Q510 BC807 Q540 BC807 Q550 BC847B R518 18 R519 330 R517 330 R514 33 Q505 BC847B BAV70 D510 A G1 KK G1 G2 BAV70 D510 A G2 KK G1 G2 R503 5K6 R502 10K R501 10K C525 150P R551 4K7 C537 150P C507 100N...

Page 237: ...G1 G2 BAV70 D620 A G1 KK G1 G2 R669 47K R677 47K BAV70 D630 A G2 KK G1 G2 BAV70 D640 A G2 KK G1 G2 BAV70 D640 A G1 KK G1 G2 C610A 10N C611B 10N R617 0 Q610 BC807 Q620 BD242FP TP604 Q660 BC817 Q670 BC8...

Page 238: ...TANT C770 22U TANT C772 22U C769 1N0 R774 8K2 R772 22K R775 18K C774 100N R790 390E C786 100N C743 47P C736 47P C735 47P R748 47K R719 150K C726 10N R727 10K R726 100E C733 470P R786 10E 1 C792 150P C...

Page 239: ...872 4K7 R874 4K7 R876 4K7 R848 4K7 C810 47N Q810 BC847B Q860 BC847B Q820 BC817 Q830 BC857 TANT C822 4U7 R815 47K R816 150K C812 100P R818 4K7 R819 4K7 Q850 BC847B Q840 BC857 D810 BAT165 P840 AUX OUT 3...

Page 240: ...M REV ISS AMENDMENTS DATE APVD D O CHKD DRAWN NO SHEETS FILE NAME TAIT ELECTRONICS IPN FILE DATE ISSUE ID 2 SC PROJECT DESIGNER 9 9 T854 XX 7XXX HARMONIC FILTER 168603b 220 01686 03 18 Mar 02 B T854...

Page 241: ...ed Part D T803 02 9000 Tone Remote This part of the manual is divided into four sections as listed below There is a detailed table of contents at the start of each section Section Title 1 General Info...

Page 243: ...1 1 2 1 1 3 1 1 4 1 1 5 1 1 5 1 1 1 5 2 Introduction Tone Remote Alarm Monitoring and Confirmations Voting Tones Other Features Front Panel Operating Controls Mode LED Alarm LEDs 1 3 1 3 1 4 1 4 1 4...

Page 244: ...6 1 4 7 Regulatory Information Canada United States Of America Facility Interface and Service Order Codes Europe New Zealand Australia Hong Kong Singapore 1 12 1 12 1 12 1 14 1 14 1 15 1 16 1 16 1 16...

Page 245: ...quip ment These plans are EIA tone remote using a single function tone In this system when the control room user presses the transmit key the line con trol equipment sends a 120ms long burst of high l...

Page 246: ...equences and or enable auxiliary outputs as a response to a confirmation 1 1 3 Voting Tones The T803 can also generate voting tones where a 4 wire line interface is used Voting systems are used where...

Page 247: ...nt panel indicates the T803 mode of operation Green Base station mode Red Repeater talk through mode or clear alarms Green base station mode Red repeater mode Speaker Speaker on off Change mode Adjust...

Page 248: ...been latched The colour of the LED indicates the source of the alarm trigger Green Auxiliary alarm Red Rack alarm The LED flashes in different ways as indicated below Press the Monitor and Mode Toggl...

Page 249: ...andard Test Voltage 13 8VDC Polarity negative earth only Supply Current 250mA max Operating Temperature Range 30 to 60 C 1 2 3 Line 1 2 3 1 Input levels Line In Level required to produce a transmitter...

Page 250: ...Remote Keytone Sensitivity 29dB less than programmed Line In level Keytone Accept Bandwidth 0 75 typical 16Hz at 2175Hz Speech at 10dBm keytone at 30dBm Talkoff Max difference between speech and keyt...

Page 251: ...V 0 2V steps RF Power Alarm Thresholds adjusted inside transmitter or PA Line Fail Alarm Timer off or 1 minute to 4 hours Auxiliary Alarm Input Trigger First and subsequent falling edges Input Thresho...

Page 252: ...al system deviation for test tone set at 60 1 2 9 Voting Programmable Tone On Idle Frequencies 1950 2100 2175 2325 2500 2600 2800 2900 2970 3000 and 3100Hz Programmable Sliding Voting Tone Frequencies...

Page 253: ...1 3 System Configuration The following flow chart will help you to configure your T800 SL2 system to utilise the features of the T803 Tone Remote Refer to Section 1 3 1 for details on the product type...

Page 254: ...available at www taitworld com This equipment complies with TIA EIA IS 968 Part 15 Class A of 47CFR and Part 68 of 47CFR as detailed below TIA EIA IS 968 Telecommunications Telephone Terminal Equipmen...

Page 255: ...will notify you in advance that temporary discontinuance of service may be required But if advance notice isn t practical the telephone company will notify the customer as soon as possible Also you w...

Page 256: ...owing section 1 4 3 1 Additional EMC filter fitting instructions Applicability In order for the T803 02 to comply with the RF electromagnetic field immunity require ments of the EMC standard EN 301 48...

Page 257: ...hnical Support at support taitworld com 1 4 4 New Zealand This product complies with the following standards PTC200 Requirements for analogue telecommunications equipment AS NZS 3548 Class A Radiated...

Page 258: ...mstances 1 4 5 Australia This product complies with the following standards AS ACIF S006 2001 Telecommunications technical standard AS NZS 3260 Electrical safety AS NZS 3548 Class A Radiated and condu...

Page 259: ...of the programming software Refer to Section 4 where the parts lists grid reference index and diagrams will provide detailed information on identifying and locating components and test points on the m...

Page 261: ...T800 receiver and sends audio to the T800 transmitter to which it is connected via the special backplane PCB Receiver audio is low frequency filtered to extend the radio CODEC s effective frequency r...

Page 262: ...ne times pro grammed by PGM800Win If a function tone is detected the DSP signals the micro using the CALL_UP line TP301 pulled low The micro then interrogates the DSP via the serial communications con...

Page 263: ...rms When an alarm is triggered it is latched as indicated by the corresponding LED on the front panel If the T803 is keying the transmitter or sending receiver audio to the line the latched alarm is i...

Page 264: ...V supply line voltage is measured by the A D converter IC208 every 50ms If the voltage is below the programmed alarm threshold 0 05V for more than 25 sec onds of a 30 second sampling period the alarm...

Page 265: ...y either pressing both front panel switches together or send ing the T803 a correctly programmed Clear Alarms function tone All alarms are cleared together Clearing alarms turns off all LEDs cancels a...

Page 266: ...ne Operation When the T803 is programmed to generate a tone on idle the microprocessor monitors the receiver Mute In signal When it is high receiver muted the DSP is instructed to generate a voting to...

Page 267: ...meric Scaling 5Tone Pip Tone Generator Test Tone Generator Morse Code Generator Radio Codec DSP Line Codec 2W 4W Select Line TX Audio State Machine Control Micro Numeric Scaling RX Audio BandPass Filt...

Page 269: ...of the programming software Refer to Section 4 where the parts lists grid reference index and diagrams will provide detailed information on identifying and locating components and test points on the m...

Page 270: ...12 Copyright Tait Electronics Limited August 2004 All rights reserved Figure Title Page 3 1 3 2 3 3 3 4 X800 56 PCB3 backplane connectors links and switches T803 setup Rack and test equipment setup Cy...

Page 271: ...SK6 See Section 6 2 in Part G LN7 Not required for T803 External CTCSS Audio to Transmitter LN8 Link pins 1 2 Unbalanced Rx Audio Audio1 to T803 Not to be used when CTCSS is present on RX audio as int...

Page 272: ...rs links and switches Switch Setting Function Notes SW1 Set all switches to OFF Channel select via T803 and or PGM800Win SW2 Set switch 4 and 5 to ON For Serial Comms with the Tx Rx and T803 See LN4 s...

Page 273: ...hese lines must be done using a high impedance load to not upset the match levels Output level 4 4dBm when the T803 Line In level is properly set up or when the T803 is in Test Mode 4 TX_EX LINE4_1 5...

Page 274: ...e triggered when already latched 3 1 2 2 Auxiliary Control Outputs The 4 Auxiliary outputs are of common collector type they will only sink current and are rated to a maximum of 50V and 250mA The outp...

Page 275: ...one and keytone are generated by the dispatch console and sent to the T803 via the leased line or an audio generator could be used with the line loss simulated For the Line Out level the test tone is...

Page 276: ...d to communicate both on air to radios and down the line to dispatch consoles It plugs into the RJ11 connector on the front panel which dou bles as a programming port It is electrically connected in p...

Page 277: ...ode Toggle buttons again will change the mode to Line Out Configuration Mode1 To indicate this all the LEDs will be orange Note After entering each mode a one to two second pause is required before at...

Page 278: ...llowing levels need to be set Tx Audio Audio level from T803 to transmitter balanced Line In level Rx Audio Audio level from receiver to T803 unbalanced Line Out level The only consideration of order...

Page 279: ...line or simulate the console and line loss using an audio generator 3 Press the PTT on the dispatch console This will send a keytone to the T803 Ensure the console also sends a test tone at speech lev...

Page 280: ...ne The recommended and default configuration of LN8 is with pins 2 3 and 4 5 linked With this configuration the balanced audio from the receiver Rx Line 1 and Rx Line 4 is changed to unbalanced audio...

Page 281: ...t measurement of receiver audio on the backplane 1 Use the RF Test Set to generate an on channel signal to un mute the receiver 2 Modulate the RF carrier with a 1020Hz tone1 at 60 full system deviatio...

Page 282: ...put as measured on the test set 5 For LN8 with pins 1 2 linked adjust RV2 on the backplane to produce 60 full system deviation at the transmitter RF output as measured on the test set Note De Emphasis...

Page 283: ...onitor button increases the level or the Mode Toggle button decreases the level until the level is acceptable at the dispatch console Note The monitor speaker is forced on in this mode so the test mic...

Page 284: ...Basestation Mode auxiliary outputs receiver defeat or cancel alarms carry out the checks in Step 2 above but pay particular attention to the function tone programming If changing channels is a proble...

Page 285: ...guard tone 7 The console keys the transmitter correctly except when speech is present This is known as Talkoff and occurs when the difference between the keytone level and speech peak level exceeds s...

Page 286: ...djust the relative input and output levels of the dispatch console Again this has the effect of reducing the noise on the line input of the T803 If the above solutions do not help resolve the problem...

Page 287: ...vices which are susceptible to damage from static charges Refer to Section 3 1 for more information on anti static procedures when handling these devices This section provides the following informatio...

Page 289: ...set of PCB information Parts Lists 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 qu...

Page 290: ...vertical 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...

Page 291: ...Page 220 01581 04 Parts List Mechanical and Miscellaneous Parts Grid Reference Index PCB Layout Top Side PCB Layout Bottom Side Overview and Front Panel Circuit Diagram Interface Circuit Diagram Cont...

Page 293: ...00 08 CAP CER 0805 10N 10 X7R 50V C4 015 26100 08 CAP CER 0805 100N 10 X7R 50V C400 015 24100 08 CAP CER 0805 1N 10 X7R 50V C401 015 24100 08 CAP CER 0805 1N 10 X7R 50V C402 015 24100 08 CAP CER 0805...

Page 294: ...L504 057 10120 03 IND 0805 120E 100M 2 EMI SUPR L505 057 10120 03 IND 0805 120E 100M 2 EMI SUPR L506 057 10120 03 IND 0805 120E 100M 2 EMI SUPR L507 057 10120 03 IND 0805 120E 100M 2 EMI SUPR L508 05...

Page 295: ...M F SMD 0805 10K 1 R343 036 15100 10 RES M F SMD 0805 10K 1 R344 036 15100 10 RES M F SMD 0805 10K 1 R345 036 15100 10 RES M F SMD 0805 10K 1 R346 036 15100 10 RES M F SMD 0805 10K 1 R347 036 15100 10...

Page 296: ...230 00020 38 SW SPNO THRU HOLE PCB MTG 240 00020 72 HDR 2W PCB MTG ULTREX 240 04020 76 SKT HSNG 4W RECEP CRIMP ULTREX 252 00010 55 MIC SPKR 40MM 0 5W 16E FOSTER 303 23149 00 CVR SIDE T1511 20 0000 308...

Page 297: ...H1 C412 1 D6 4 H0 C413 1 D8 4 H8 C414 1 E8 4 H8 C415 1 D6 4 H7 C416 1 D6 4 H6 C417 1 D7 4 H6 C418 1 D4 4 H5 C419 1 D3 4 H4 C420 1 D5 4 H3 C421 1 D5 4 H3 C422 1 D5 4 H2 C423 1 D4 4 H1 C424 1 D3 4 H1 C4...

Page 298: ...G6 2 F5 R225 1 G7 2 G5 R226 1 E7 2 G5 R227 1 G6 2 H5 R228 1 F13 2 L8 R229 1 F9 2 H8 R230 1 F10 2 I8 R231 1 F12 2 J8 R232 1 F13 2 L8 R234 1 C15 2 L5 R235 1 F15 2 L8 R236 1 D15 2 L5 R237 1 D15 2 L5 R238...

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Page 300: ...12345678901234567890121234 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234 123456789012345678901234567890121234567890123456789012345678901212345678...

Page 301: ...R14 330 TDA8541 IC3 IN 4 IN 3 SVR 2 MODE 1 GND 7 VCC 6 OUT 5 OUT 8 C6 47U R3 470 L131 M21A C166 1N0 C128 1N0 L114 M21A 1 6 SK2 6 WAY VERT PHONE JACK C3 1N0 D6 6V2 3 2 R1 10 CONTROL SHEET 3 U_A8 U_A9 U...

Page 302: ...4 1K0 R205 1K0 R206 1K0 R207 1K0 R208 1K0 R266 33K R262 10K C233 1N0 C222 1N0 R275 4K7 R274 4K7 R273 4K7 TP211 TP212 TP213 TP208 C217 10N C210 10N TP204 IC205 145480 BCLKR 9 BCLKT 12 MCLK 11 DR 8 DT 1...

Page 303: ...TMS320C203 14 21 30 37 48 54 VSS 59 70 83 88 94 42 4 7 11 16 35 50 VDD 63 75 91 25 65 C301 10N C300 10N C302 10N C303 10N C304 10N R351 10K R341 10K R321 4K7 C312 1N0 C314 27P R317 10K R322 1K8 R323...

Page 304: ...446 1N0 C432 1N0 L405 M21A C418 1N0 C405 1N0 L406 M21A C419 1N0 C406 1N0 L420 M21A C447 1N0 C433 1N0 L421 M21A C448 1N0 C434 1N0 L407 M21A C420 1N0 C407 1N0 L408 M21A C421 1N0 C408 1N0 L422 M21A C449...

Page 305: ...4A FIT DUAL DIGIPOT DS1868 TONY S 01 03 02 L507 M21A L500 M21A C500 27P L508 M21A C522 1N0 C515 1N0 L509 M21A C523 1N0 C516 1N0 L501 M21A C508 27P C501 27P L502 M21A C509 27P C502 27P L510 M21A C524 1...

Page 306: ...04 1 Mar 02 A T803 TONY S 00A ORIGINAL CRAIG M 01A IC307 PACKAGE ADDED GND TO F P CRAIG M 02A UPDATED FOR T805 PAUL G 11 2 00 03A PCB UPDATE PAUL G 17 4 00 04A FIT DUAL DIGIPOT DS1868 TONY S 01 03 02...

Page 307: ...eserved Part E T850 VCO PCB 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 Secti...

Page 309: ...f PCB information Parts Lists 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 th...

Page 310: ...August 2004 All rights reserved Variant Components A variant component is one that has the same circuit reference but different value or specification in different product types Variant components hav...

Page 311: ...Copyright Tait Electronics Limited August 2004 All rights reserved 2 T850 VCO PCB This section contains the following information IPN Section Page 220 01145 07 Parts List PCB Layout Bottom Side PCB L...

Page 313: ...120p 5 NPO 50v C23 015 21820 02 Cap 0805 8p2 0 1 NPO 50v C24 015 05470 08 Cap Cer 1206 47n 10 X7r 50v D1 A 001 10015 30 Diode SMD Vcap BB153 SOD323 D1 B 001 10043 90 Diode SMD BB439 Vcap SOD323 D1 C...

Page 314: ...ust 2004 All rights reserved T850 VCO PCB IPN 220 01145 07 Top Side A 1 2 3 4 5 6 B C D E F C1 C10 C15 C4 C6 C7 C8 L6 R6 TL1 C11 C12 C13 C14 C16 C17 C18 C19 C2 C21 C22 C23 C24 C3 C5 C9 D1 D2 L1 L2 L3...

Page 315: ...CO PCB IPN 220 01145 07 Bottom Side Copyright Tait Electronics Limited August 2004 All rights reserved IPN 220 01145 07 M8SL2 00 002 812 T850 VCO PCB Information E2 5 5 1 2 3 4 6 A B C D E F PL2 PL3 P...

Page 317: ...2P2 C10 1P8 C11 3P3 C12 1N0 C13 1N0 C14 120P C16 120P C17 120P C18 27P C19 47N TANT C2 10U C21 120P C22 120P C23 8P2 C24 47N C3 1N0 C4 1P0 C5 100N C7 10P C8 33P C9 120P D1 BB439 1 2 D2 BB439 1 2 L1 3...

Page 319: ...F T800 23 0011 Power Supply This part of the manual provides information on the power supply and is divided into six sections as listed below Section Title 1 General Information 2 Power Supply Descrip...

Page 321: ...Bas estation modules via a cable assembly with a 12A fuse which connects between the DC output connector on the back of the unit and the backplane PCB X800 56 PCB3 The T800 23 0011 is protected again...

Page 322: ...r Supply Concept switched mode technology pulse width modulation Overtemperature Protection shuts down when PC Board tempera ture rises above 95 C 5 C Reset auto recovery Cooling convection and forced...

Page 323: ...ly Continuous 10 C to 50 C 0 to 14 5ADC Continuous up to 60 C 0 to 8 5ADC Operation from 100 130VAC supply Continuous 10 C to 20 C 0 to 14 5ADC Continuous 20 C to 50 C 0 to 8 5ADC Note Continuous oper...

Page 324: ...ctromag netic susceptibility specifications of the FCC rules for the United States Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 This devi...

Page 325: ...r s authority to operate the equipment under FCC rules 1 3 2 Safety Approvals This equipment complies with IEC 60950 1999 Safety of information technology equipment All the relevant provi sions includ...

Page 327: ...ferrite filters These components are shown in Figure 2 1 below Figure 2 1 T800 23 0011 internal view See the Parts List in Section 6 2 2 for more detail PSU Module Molex Socket DC Output IEC Plug Main...

Page 328: ...en it has cooled down to an acceptable operational temperature Caution Correct mounting of the T800 23 0011 power supply is important Refer to Section 3 3 for ventilation guidelines Ignoring these con...

Page 329: ...e programming and speaker connection Warning FUSE The cable connecting the T800 23 0011 DC power output to the backplane also includes a fuse This fuse is critical to the IEC 60950 safety compliance o...

Page 330: ...e amount of heat is generated during normal operation An adequate flow of cooling air is therefore essential for reliable operation Caution Do not operate this unit in a completely enclosed cabinet It...

Page 331: ...and switch it on Vary the DC load and check that the output voltage and current are within the specifications refer to Section 1 2 4 4 2 Output Current Overload To confirm the operation of the current...

Page 332: ...ions Note A real reading of the level of noise present on the output of a switching power supply is very difficult to obtain as low noise levels common mode noise paths and ground loops all lead to in...

Page 333: ...uitry Replace module and return faulty module for servicing 2 Output voltage below specification Mains supply is to low Check and correct mains supply problem Current overload protec tion is active Ch...

Page 335: ...nt rating It is strongly recommended that the mains supply to the whole of the repair and test area is supplied via an earth leakage circuit breaker 6 1 2 Warning Fuse The cable connecting the T800 23...

Page 336: ...rviceable item This module contains components that operate at voltages that may be lethal Do not open this module Caution Disconnect the mains IEC connector and wait for 5 minutes for the internal vo...

Page 337: ...ice Information F6 3 Copyright Tait Electronics Limited August 2004 All rights reserved 6 2 2 Assembly Drawing Figure 6 2 below shows an exploded view of the T800 23 0011 Figure 6 2 Mechanical assembl...

Page 339: ...ction D range Wiring RF Coax Cable and N Type Connector 1 2 1 2 1 2 1 2 1 3 1 5 1 6 2 2 1 2 1 1 2 1 2 2 2 2 2 1 2 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 T854 Optional Features Audio Processor Link Detai...

Page 340: ...ils T800 SL2 Assembly with T803 fitted T800 SL2 Assembly without T803 fitted T800 SL2 Assembly with T803 fitted rear view 1 3 1 3 1 4 1 4 1 5 1 7 1 8 1 9 3 1 Talk Through Repeater 3 1 4 2 4 3 4 4 4 5...

Page 341: ...EN60950 the power supply module used with the T800SL2 must be provided with an easily accessible mains disconnect device compliant with IEC61058 such as a switch or circuit breaker This provides the...

Page 342: ...tion includes a fuse This fuse is critical to the IEC 60950 safety compliance of the T800 SL2 Base Station and must be used or compliance will be voided If the fuse has blown it must be replaced with...

Page 343: ...ured as Audio 2 by internal link resistors if required 10 8 to 16V DC Receiver gate open collector Power supply ve earth Adjustable 50 to 10dBm 4 5V 100dBm 1V 15dB External auxiliary audio processing...

Page 344: ...uxiliary D range kit is also available for special applications requiring custom internal wiring 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 External CTCSS input 1kHz deviation at150Hz 500mV rms To key transm...

Page 345: ...any N type plugs connected to Tait equipment are assembled according to the manufacturer s instructions It is particularly important that the centre pin in the plug is positioned correctly if the pin...

Page 349: ...SL2 G1 9 Copyright Tait Electronics Limited August 2004 All rights reserved Figure 1 8 T800 SL2 Assembly with T803 fitted rear view Transmitter Receiver Backplane PCB Tone Remote Front Panel Power Sup...

Page 351: ...The letters in this column refer to the letters printed on the PCB beside each pair of pins Note that the link names and pin numbers are different to earlier products The lettering A to N is however...

Page 352: ...rmer No transformer leaded R200 and R203 or SMD R200A and R203A by pass resistors fitted and an attenuator pad if necessary The default option is T210B SMD P2781 or similar 600 600 non centre tapped S...

Page 353: ...To retain the DC loop keying keying facility there is a centre tapped version of the ETAL leaded and SMD transformers the P2602 and P2782 respectively This will only work for Common Earth systems If...

Page 354: ...t of the system by means of the optocoupler IC250 A constant current source Q270 allows keying voltages between 6 and 50 V R240 and R243 have replaced SL203 and SL204 originally on the T856 underside...

Page 355: ...stereo socket will disable the audio input from the line The audio switching occurs when the PTT switch is closed 2 6 Keying With Option PCBs If an option PCB is fitted the exciter may be keyed via th...

Page 356: ...use Note that this input will have 4 5V half rail and needs isola tion unless R289 is also removed Leaving R291 as 0 and removing R290 may improve data shape less overshoot as C289 is still in circui...

Page 357: ...ines to the transmitter to modulate the carrier The receiver and transmitter operate simultaneously and must therefore be on different frequencies The minimum frequency separation depends on the duple...

Page 359: ...transmitter is energised to 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...

Page 360: ...system configuration also uses an aerial changeover relay as well as the tail timer the changeover relay must be driven from the relay driver Q250 in the audio processor rather than by Tx Key or Tx En...

Page 361: ...remote control are distant DC loop keying is provided by an isolated supply driver and detector because an earth cannot be relied on refer to Figure 5 7 Figure 5 8 and Figure 5 9 Figure 5 7 Isolated C...

Page 362: ...Tait Electronics Limited August 2004 All rights reserved Figure 5 8 Isolated Loop Current Switch Figure 5 9 Typical System O O O O O SW SW Isolated Supply Unit 1 Unit 2 Long Line Det Optional bridge t...

Page 363: ...0 56 PCB3 Backplane PCB Caution This equipment contains CMOS devices which are susceptible to damage from static charges This section contains the following information IPN Section Page 220 01702 02 B...

Page 364: ...reserved 6 X800 56 PCB3 PCB Information This part of the manual provides the parts list PCB layouts and circuit diagram for the X800 56 PCB3 backplane PCB There is a detailed table of contents at the...

Page 366: ...iate set of PCB information Parts Lists 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 yo...

Page 367: ...the vertical 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 refer...

Page 369: ...ns 2 3 and Pins 4 5 Changes the balanced Rx Line audio output to unbalanced for the T803 This option should be used when CTCSS is present on RX audio so that the internal CTCSS filter can be applied L...

Page 370: ...rs after S N 13098764 When ON connects direct FWD power sense voltage or direct REV power sense voltage to ground depending on the links on LN10 See description of LN10 in the previous table Not recom...

Page 371: ...NK MT1 MTG C420P 35 P3MM5_420C MOUNTING HOLE 3 5MM HOLE 4 2MM PAD MT2 MTG C420P 35 P3MM5_420C MOUNTING HOLE 3 5MM HOLE 4 2MM PAD MT3 MTG C420P 35 P3MM5_420C MOUNTING HOLE 3 5MM HOLE 4 2MM PAD PL1 240...

Page 373: ...IPN 220 01702 02 M8SL2 00 002 812 X800 56 PCB3 PCB Information G6 2 7 Copyright Tait Electronics Limited August 2004 All rights reserved X800 56 PCB3 PCB IPN 220 01702 02 Top Side 220 01702 02...

Page 374: ...IPN 220 01702 02 G6 2 8 X800 56 PCB3 PCB Information M8SL2 00 002 812 Copyright Tait Electronics Limited August 2004 All rights reserved X800 56 PCB3 PCB IPN 220 01702 02 Bottom Side 220 01702 02...

Page 377: ...manual features a brief description of the major ancillaries that may be used with T800 SL2 equipment For a comprehensive list of available ancillary equip ment please contact your nearest Tait Dealer...

Page 379: ...ne PCB thus enabling T800 SL2 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 t...

Page 380: ...necting test equipment including a PC and power supply to a T800 Series I or 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 s...

Page 381: ...t PCB The T800 10 0000 is a small PCB that plugs into the Micromatch connector SK805 in the microcontroller compartment of a T800 SL2 receiver exciter or transmitter It is fitted with an eight switch...

Page 382: ...imulcast trans mission The T800 30 0000 and T800 30 0002 are not designed for use with 66 to 88MHz equipment T800 32 0000 and T800 32 0010 DFSK Modulators The T800 32 0000 and T800 32 0010 are DFSK mo...

Page 383: ...in an appropriate backplane PCB to connect to a T800 SL2 module fitted with a T800 06 0000 kit The other end is ter minated with a BNC connector which can be mounted on the rack frame T801 00 Frequen...

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