T800-02 CTCSS module Technical Note 566
Contents
1. CTCSS Tone To Transmitter CTCSS or via Audio 2 Receiver Receiver Rx Gate Output Gate Input Tone Out Transmitter Gnd Defeat Gate Output 1 Gate Output 2 Speech 8 Tone In Speech Out Tone Out Receiver T800 02 Audio 1 Speech amp Tone In No 2 Gate Output 2 Transmitter Line 1 Gate Input Receiver Mute Input A Transmitter Speech Out Tx En Opt Receiver Audio 3 Transmitter Line 2 Figure 10 Dual T800 02 Connection Details Both T800 02 units can be mounted side by side above the audio processor on the lugs provided refer to Figure 1 The wiring loom for remote programming the encode decode tones can also be installed for both units by mounting one T800 02 above the line transformer right side up and the other upside down The Tx tail time should not be used unless measures are taken to delay the removal of the inhibits at S11 during the tail time Refer to Customer Support Radio Systems Divi sion Tait Electronics Christchurch New Zealand for assistance with these modifica tions If these measures are not taken CTCSS tones will be transmitted from both PCBs during the tail time 21st April 1999 Page 9 of 22 TN 566 Adjustments T700 Series Adjust RV1 on the T800 02 PCB to provide approximately 10 of the maximum system deviation e g if maximum system deviation is 5kHz adjust RV1 for 500Hz devia tion T800 Se2. Applicability section added Introduction paragraph 4 amended Note 2 added about T825 receivers Note 3 added about removing C19 T800 02 board replaced with Talk Through PCB detected replaced by received in paragraph 2 Figure 10 corrected address details in paragraph 7 updated Reverse Phase Burst section added nL Issuing Authority Publication History and Amendment Record sections added Page 22 of 22 21st April 1999
3. kit for wiring to an additional connector at the rear of the T800 Series I or T700 radio Fit the socket to PL 1 on the T800 02 PCB and solder the wires to the connector When using the remote cable programme the DIP switch SW1 on the T800 02 to all 1 s off The T800 Series I can also be remotely programmed using a T800 07 multi channel memory PCB in place of the standard T800 10 PCB As well as allowing remote pro gramming the T800 07 PCB automatically defeats the CTCSS on any channels that are not programmed with a CTCSS tone provided the programming software used is PGM800 v2 01 or later and the CTCSS PCB is IPN 225 01202 02 or later For instructions on fitting the T800 07 PCB see TI 356 Page 8 of 22 21st April 1999 TN 566 2 Channel CTCSS Operation On A Single Channel Using 2 T800 02 Units Refer to Figure 10 This configuration is available only when the T800 02 is fitted to a T800 Series I radio The transmitter is keyed only if the receiver gate is open and one correct tone is present if two simultaneous tones are received the gate out 2 of T800 02 No 2 is inhibited The encoded tone output to the transmitter is the same frequency as the received and decoded tone A decode on one unit inhibits the decoding of the other and switches off the encode tone Each tone level can be set independently by receiving the correct input tone for each decoder or by utilising the defeat line of each decoder
4. 1M 20 16V R41 036 16150 00 RES M F 0805 CHIP 150K 5 C20 016 07100 01 CAP ELECT 6X4MM CHIP 1M 20 16V R42 036 16150 00 RES M F 0805 CHIP 150K 5 C21 016 07100 01 CAP ELECT 6X4MM CHIP 1M 20 16V R43 036 16150 00 RES M F 0805 CHIP 150K 5 c22 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R44 036 14470 00 RES M F 0805 CHIP 4K7 5 C23 015 05220 08 CAP CER 1206 CHIP 22N 10 X7R 50V R45 036 13680 00 RES M F 0805 CHIP 680E 5 C24 015 05470 08 CAP CER 1206 CHIP 47N 10 X7R 50V R46 036 15470 00 RES M F 0805 CHIP 47K 5 C25 015 23220 01 CAP CER 0805 CHIP 220P 5 NPO 50V R47 036 16100 00 RES M F 0805 CHIP 100K 5 C26 016 08100 01 CAP ELECT 6X4MM CHIP 10M 20 16V R48 036 16100 00 RES M F 0805 CHIP 100K 5 C27 016 08100 01 CAP ELECT 6X4MM CHIP 10M 20 16V R49 036 16150 00 RES M F 0805 CHIP 150K 5 C28 016 08100 01 CAP ELECT 6X4MM CHIP 10M 20 16V R50 036 15100 00 RES M F 0805 CHIP 10K 5 C29 016 08470 01 CAP ELECT SMD 6 4MM 47U 16V R51 036 15100 00 RES M F 0805 CHIP 10K 5 c30 016 08470 01 CAP ELECT SMD 6 4MM 47U 16V R52 036 15100 00 RES M F 0805 CHIP 10K 5 C31 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R53 036 13680 00 RES M F 0805 CHIP 680E 5 C32 015 05220 08 CAP CER 1206 CHIP 22N 10 X7R 50V R54 036 14680 00 RES M F 0805 CHIP 6K8 5 C33 015 05220 08 CAP CER 1206 CHIP 22N 10 X7R 50V R55 036 17100 00 RES M F 0805 CHIP 1M 5 C34 015 06100 08 CAP CER 1206 CHIP 100N 10 X7R 50V R56 036 15150 00 RES M F 0805 CHIP 15K 5 C35 015 06100 08 CAP CER 1206 CHIP 100N 10 X7
5. 5 R21 036 15100 00 RES M F 0805 CHIP 10K 5 21st April 1999 Page 19 of 22 TN 566 CTCSS TONE OUTPUT SPEECH OUTPUT 4 RX GATE INPUT GATE OUTPUT 1 Figure 16 T800 02 PCB Layout Bottom Side IPN 225 01202 03 Page 20 of 22 21st April 1999 TN 566 Page 21 of 22 IPN 225 01202 03 t Diagram Ircul Figure 17 1800 02 C 21st April 1999 d 0 N W 1 A F I H al 4 El q J g Y z6 so 80 31v0 4 VETZ0008 IWYN JNA cava Ad HO NMVea SIN3NONINV 3NSSI E HTN HTN da WND ToLoud v 40 eozozio szz Nal d30d09N3 30 TANNVHO JATONIS co NS mon
6. RF signal generator as in 3 21st April 1999 Page 13 of 22 TN 566 Measure the regenerated tone frequency and level at the tone output Adjust RV1 T800 02 and check that the tone level can be adjusted from 0 to at least 1V rms Check that the tone frequency is correct and the distortion is less than 5 Adjust RV1 to give 500Hz deviation at the transmitter output key the transmit ter via carrier only push button SW101 To Check The High Pass Filter Set the signal generator output to 70dBm and modulate with 1kHz and CTCSS i e 3kHz plus 500Hz Note the level at the speech output Reduce the 1kHz generator to zero output and measure the difference in level between the 1kHz and the CTCSS tone Check that this is at least 26dB below the 1kHz level 26dB de emphasised 33dB flat response Specifications General Frequency Range Number Of Tones Supply Current Supply Voltage Operating Temperature Range Dimensions Height Decoder Audio Input Level Tone Squelch Opening Tone Detect Bandwidth Minimum Maximum Response Time Encoder Decoder 67 to 250 3Hz single frequency 15mA 9V from T800 Series I receiver or transmitter 30 C to 60 C 52x 58mm 10mm 20mV rms to 2V rms better than 6dB sinad 5dB typical 2Hz 4Hz 150ms 120ms typical from tone applied to tone out 90 level Page 14 of 22 21st April 1999 TN 566 Speech Filter R
7. 0 01 RES PRESET SMD 20K 25 4X4 5X2 5MM 0 1W 201 00030 09 WIRE 1 T C WIRE 7 0 2MM PVC WHITE 50V 201 00030 10 WIRE 1 T C WIRE 7 0 2MM PVC BLACK R2 036 16100 00 RES M F 0805 CHIP 100K 5 225 01202 03 PCB T800 CTCSS DE ENCODER R3 036 16100 00 RES M F 0805 CHIP 100K 5 240 04020 76 SKT RECEPTACLES WIRE CRIMP FOR ULTREX R4 036 16100 00 RES M F 0805 CHIP 100K 5 HOUSING R5 036 16100 00 RES M F 0805 CHIP 100K 5 240 04020 80 SKT HOUSING 10 WAY CORD MTG ULTREX R6 036 16100 00 RES M F 0805 CHIP 100K 5 303 50078 00 CLIP A4M2630 0 1MM SPRING WIRE CABLE R7 036 16100 00 RES M F 0805 CHIP 100K 5 CLAMP R8 036 16100 00 RES M F 0805 CHIP 100K 5 349 00020 32 SCREW TAPTITE M3X8MM PAN POZI BZ R9 036 16100 00 RES M F 0805 CHIP 100K 5 365 00011 38 LABEL STATIC WARNING YELLOW A4A315 R10 036 16100 00 RES M F 0805 CHIP 100K 5 365 00011 54 LABEL WHITE RW1556 2 90 24MM R11 036 16330 00 RES M F 0805 CHIP 330K 5 369 00010 27 TIE CABLE NYLON 140 2 6MM R12 036 18100 00 RES M F 0805 CHIP 10M 10 399 00010 51 BAG PLASTIC 75 100MM R13 036 15120 00 RES M F 0805 CHIP 12K 5 399 00010 86 BAG STATIC SHIELDING 127X203MM R14 036 14100 00 RES M F 0805 CHIP 1K 5 410 00010 64 PKG HEADER CARD A3M2392 R15 036 15120 00 RES M F 0805 CHIP 12K 5 419 80200 00 FITTNG INS T800 02 TO T800 SI R16 036 12470 00 RES M F 0805 CHIP 47E 5 R17 036 14680 00 RES M F 0805 CHIP 6K8 5 R18 036 15270 00 RES M F 0805 CHIP 27K 5 R19 036 16390 00 RES M F 0805 CHIP 390K 5 R20 036 15270 00 RES M F 0805 CHIP 27K
8. 34 oa 720 T3AT1 3NOL ESA ye e jaf k e k i net AS A e ONO YO Ir yr Wy Y y en ZHA 89 3 o LIHA e E D0 S y A SO to 8 a 10 L e fp jor far le o fz g H3174 3NOL SSOLO ANO ANT ISE O EN zmo m9 ONS 2 A A a POPE Peet He i Pe Mae E el om o l X0 At a ZO lO 00 fd zd Id Od 9 St td 9d Sd bd Ed zd td 0d Lcd ganes a al 1 ja j f e p ts meee e E es asn a om ont AIdANS AS a gy asawa wise MS wd a wel oz a LT tw 29 us om abe 19 vio a a A o z u jo jo ls ie avdorl yeze ee l ita aie aie Vio aH A i g IX e Noo ES nos Oon Ni xr FETI yoe i od au F eso yie gan pe oon SEL oa asale a 4 Y3N3Z__ 01 At 1a 9 Ne a i j Sr AR valor fj lt f e f sol sol i me OOF peer aanesor aanesor gE 6 AGt mor abr T e a t 02 es od soot 0 232383238383 a RA eu i l Z i pl A ap e if e ed i aren Ne Es ie S3LV9 dasnNnn e j 2 SNId HAMOd n Hd ogg Md area AVM OL 4 s o Net ezoL Z Ag 30IAIa 14 oy j AS i 9 Aa YAGIAIG AIEVNVYDOd Lid 0L Hd og 8 1K Mz A Z 88 con alo avzenT arzen deeg End canes e le T sol 801 Hd oy FA ob A r y 6 E 8 4 dog Age n Net d O N N 1 A E H 9 El 3 q 9 g Y TN 566 Issuing Authority This TN was issued by Andreas Becker RSD Customer Support Manager Publication History Publication Date Author 21st April 1999 D Reynolds Amendment Record Publication Date Amendment 21st April 1999 TI 346D republished as TN 566
9. 5 NPO 50V R25 036 13680 00 RES M F 0805 CHIP 680E 5 C4 016 07100 01 CAP ELECT 6X4MM CHIP 1M 20 16V R26 036 14270 00 RES M F 0805 CHIP 2K7 5 C5 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R27 036 16150 00 RES M F 0805 CHIP 150K 5 C6 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R28 036 16150 00 RES M F 0805 CHIP 150K 5 C7 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R29 036 16150 00 RES M F 0805 CHIP 150K 5 C8 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R30 036 15100 00 RES M F 0805 CHIP 10K 5 c9 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R31 036 16820 00 RES M F 0805 CHIP 820K 5 C10 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R32 036 16330 00 RES M F 0805 CHIP 330K 5 C11 016 08100 01 CAP ELECT 6X4MM CHIP 10M 20 16V R33 036 16100 00 RES M F 0805 CHIP 100K 5 C12 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R34 036 16100 00 RES M F 0805 CHIP 100K 5 C13 015 25100 08 CAP CER 0805 CHIP 10N 10 X7R 50V R35 036 16100 00 RES M F 0805 CHIP 100K 5 C14 015 23220 01 CAP CER 0805 CHIP 220P 5 NPO 50V R36 036 16100 00 RES M F 0805 CHIP 100K 5 C15 015 05220 08 CAP CER 1206 CHIP 22N 10 X7R 50V R37 036 15330 00 RES M F 0805 CHIP 33K 5 C16 015 05470 08 CAP CER 1206 CHIP 47N 10 X7R 50V R38 036 15470 00 RES M F 0805 CHIP 47K 5 C17 016 07100 01 CAP ELECT 6X4MM CHIP 1M 20 16V R39 036 16100 00 RES M F 0805 CHIP 100K 5 C18 016 07100 01 CAP ELECT 6X4MM CHIP 1M 20 16V R40 036 16100 00 RES M F 0805 CHIP 100K 5 C19 016 07100 01 CAP ELECT 6X4MM CHIP
10. C time constant C37 C38 amp R72 The outputs of the exclusive OR gates are weighted and summed by resistors R37 R38 amp R46 This signal is then filtered by a 3 pole active low pass filter RV1 adjusts the level of tone output tone deviation speech high pass filter tone low pass filter and the lim iter Receiver or line audio is fed into the speech tone input and is filtered for speech by two cascaded 3 pole active filters The combined cut off frequency is 400Hz 1 5dB This effectively removes the CTCSS tone from the speech The CTCSS tones are filtered to remove speech by a 3 pole active filter with a cut off fre quency of 250Hz 1dB The filter output is amplified and limited and then applied to the commutating filter and synchronous detector The limiter also provides a bandpass function from 60 to 280Hz which reduces the effects of DC transients at the speech tone input Commutating Filter amp Synchronous Detector The commutating filter is a fixed bandwidth filter of 2 8Hz IC7 is a triple changeover switch The input signal from the limiter is sampled via R35 C20 amp C21 and R33 C18 amp C19 The sampling time and phase is obtained from the divide by eight decoder IC6 When the sampling is the same frequency as the incoming tone frequency a net charge is developed on each of the sampler capacitors The charges which are in quadrature with respect to each other are then summed and the original signal is approx
11. H TONE INPUT S5 Rx Gate Input Figure 6 T800 02 PCB Layout Top Side Page 4 of 22 21st April 1999 TN 566 T700 Control PCB Modifications 1 Cut the track from pin 5 of IC209 and remove R99 as shown in Figure 7 Solder the T800 02 wire from S8 to the test pad indicated in Figure 7 gt wt Remove R99 10 Q 100 ASS Cut track a an ca SS SSS Figure 7 T700 Control PCB Bottom Side A 2 Attach the wires from the T800 02 PCB to the top side of the T700 control PCB as follows refer to Figure 8 T800 02 PCB T700 Control PCB S1 P5 Pin 8 Rx Det Audio S4 P 5 Pin 16 Tx CTCSS S5 1C209 Pin 5 Aud Mute S6 P5 Pin 19 Gnd S7 P5 Pin 14 9V SW Cut the unused wires S2 red and S3 orange Orientation of Foam Tape ee Support Fixing Screw Avoid 600 Ohm Interface PCB Figure 8 1800 02 To T700 Mounting Details 21st April 1999 Page 5 of 22 TN 566 Note Trim the component legs on the back of the T800 02 PCB so that once the PCB is in place the legs will not short circuit against the T700 receiver shield or chassis Cut the double sided foam tape into three pieces of equal size If the T700 is fitted with a 600 Ohm interface PCB discard one piece of tape and position the remain ing two pieces on the bottom of the T800 02 PCB The two strips of tape should be flush with the PCB edges and r
12. IC 4018 SMD DEVIDE BY N COUNTER R76 036 14470 00 RES M F 0805 CHIP 4K7 5 C7 002 10040 53 S IC 4053 SMD TRIPLE 2CH MULTI PLEXR R77 036 16100 00 RES M F 0805 CHIP 100K 5 c8 002 10003 24 S IC SMD 324 QUAD OP AMP S014 R78 036 16100 00 RES M F 0805 CHIP 100K 5 c9 002 10003 24 S IC SMD 324 QUAD OP AMP S014 R79 036 17100 00 RES M F 0805 CHIP 1M 5 C10 002 10040 70 S IC SMD HEF4070BT QUAD EXCL OR SO 14 R80 036 15330 00 RES M F 0805 CHIP 33K 5 PL1 240 00020 78 HEADER 10 WAY RT ANGLE PCB MTG AMP swi 230 10010 20 SWITCH DIP SMD 10 WAY ULTREX X1 274 00010 05 XTAL 32 768KHZ SUB MINI CLOCK C W TEFLON Q1 000 10008 17 S XSTR SMD BC817 25 NPN SOT 23 AF LO PWR INS Q2 000 10008 48 S XSTR SMD BCW60 BC848B215 NPN SOT23 Q3 000 10008 48 S XSTR SMD BCW60 BC848B215 NPN SOT23 A 201 00030 01 WIRE 1 T C WIRE 7 0 2MM PVC BROWN a4 000 10008 57 S XSTR SMD BCW70 BC857 215 PNP SOT23 AF 201 00030 02 WIRE 1 T C WIRE 7 0 2MM PVC RED Q5 000 10008 48 S XSTR SMD BCW60 BC848B215 NPN SOT23 AF 201 00030 03 WIRE 1 T C WIRE 7 0 2MM PVC ORANGE Q6 000 10008 48 S XSTR SMD BCW60 BC848B215 NPN SOT23 AF 201 00030 04 WIRE 1 T C WIRE 7 0 2MM PVC YELLOW 201 00030 05 WIRE 1 T C WIRE 7 0 2MM PVC GREEN R 030 55120 20 RES FILM Al 12K 5 0 4W 4X1 6MM 201 00030 06 WIRE 1 T C WIRE 7 0 2MM PVC BLUE R 036 15100 00 RES M F 0805 CHIP 10K 5 201 00030 07 WIRE 1 T C WIRE 7 0 2MM PVC VIOLET R1 036 16100 00 RES M F 0805 CHIP 100K 5 201 00030 08 WIRE 1 T C WIRE 7 0 2MM PVC GREY RV1 042 1520
13. R 50V R57 036 15100 00 RES M F 0805 CHIP 10K 5 C36 015 23680 08 CAP CER 0805 CHIP 680P 10 X7R 50V R58 036 16330 00 RES M F 0805 CHIP 330K 5 C37 015 06100 08 CAP CER 1206 CHIP 100N 10 X7R 50V R60 036 14220 00 RES M F 0805 CHIP 2K2 5 C38 015 06100 08 CAP CER 1206 CHIP 100N 10 X7R 50V R61 036 16100 00 RES M F 0805 CHIP 100K 5 C39 015 25150 08 CAP CER 0805 CHIP 15N 10 X7R 50V R62 036 16100 00 RES M F 0805 CHIP 100K 5 R63 036 15100 00 RES M F 0805 CHIP 10K 5 D 001 50012 05 S DIODE Al 1N4531 SI SMALL SIG R64 036 16820 00 RES M F 0805 CHIP 820K 5 D 001 50012 05 S DIODE Al 1N4531 SI SMALL SIG R65 036 14680 00 RES M F 0805 CHIP 6K8 5 D1 001 10000 70 S DIODE SMD BAV70 DUAL SWITCH SOT 23 R66 036 15150 00 RES M F 0805 CHIP 15K 5 COMM CATHDE R67 036 14220 00 RES M F 0805 CHIP 2K2 5 D2 001 10000 70 S DIODE SMD BAV70 DUAL SWITCH SOT 23 R68 036 15180 00 RES M F 0805 CHIP 18K 5 COMM CATHDE R69 036 15100 00 RES M F 0805 CHIP 10K 5 R70 036 16100 00 RES M F 0805 CHIP 100K 5 C1 002 10040 46 S IC 4046 SMD PHASE LOCK LOOP R71 036 10000 00 RES M F 0805 CHIP ZERO OHM C2 002 10040 18 S IC 4018 SMD DEVIDE BY N COUNTER R72 036 17100 00 RES M F 0805 CHIP 1M 5 C3 002 10040 69 S IC 4069 SMD CMOS HEX INVERTERS R73 036 17100 00 RES M F 0805 CHIP 1M 5 C4 002 10045 26 S IC 4526 SMD PRESET 4BIT DWN CNTR R74 036 15470 00 RES M F 0805 CHIP 47K 5 C5 002 10045 69 S IC 4569 SMD DUAL 4BIT DWN CNTR R75 036 15680 00 RES M F 0805 CHIP 68K 5 C6 002 10040 18 S
14. R245 from 1k5 to 22k and adjust RV202 fully clockwise Page 10 of 22 21st April 1999 TN 566 Testing T800 Series Only Test Equipment Required frequency counter modulation monitor RF signal generator sinadder audio level meter 50 ohm dummy load to suit transmitter 2 audio generators amp combining pad refer to Figure 12 Receiver Performance Tests Refer to Figure 2 and Figure 11 Note For narrow band sets use half the stated deviation levels Gate Out 1 Tx Key Line O P 1 Line I P 1 Rx T800 02 Ex Line O P 4 Gate l P 4 Audio 2 CTCSS 8 Figure 11 D Range Connections T800 02 Mounted In Receiver 1 Set up the T800 Series I receiver and transmitter as detailed in the appropriate Service Manual and then fit the T800 02 2 Set up the test equipment as shown in Figure 12 To Tx Key Receiver Speech Only T800 1800 02 Transmitter Modulation eter q Distortion Analyser oz 98 ce 20 D gt 23 lt 220 Ohms i 220 Ohms 0 i Audio Generator Speech AF Level Generator Meter CTCSS 220 Ohms 600 Ohm Combining Pad Sinadder Figure 12 Receiver Test Set Up 21st April 1999 Page 11 of 22 TN 566 3 To Check Decoder Operation Set the RF signal generator output to 70dBm Modulate the generator with the audio oscillator at a level to give 3kHz devia tion at 1kHz CTCSS generator set to zero output Monitor the CTCSS gen
15. Technical Note TN 566 T800 02 CTCSS Encoder Decoder 21st April 1999 Applicability This Technical Note TN applies to T800 Series I base station equipment and T700 series duplex two way radios Introduction The T800 02 CTCSS unit is designed to operate with the T800 Series I range of receivers and transmitters It will encode and decode CTCSS tone frequencies within the range 67 to 250 3Hz and is compatible with any other CTCSS unit which conforms to EIA RS220 The T800 02 has silent squelch tail circuitry fitted to improve communication quality When fitted to a T800 Series I radio the T800 02 is internally mounted above the audio processor section onto screw lugs provided on the chassis Provision has been made for two units to be fitted for dual tone CTCSS if required The T800 02 CTCSS unit can also be fitted to a T700 duplex radio The T700 duplex radio may be configured in a variety of fashions including repeater or line control base The T800 02 is also compatible with the T700 600 ohm interface PCB This TN replaces TI 346D Any part that has changed from TI 346D is indicated by a vertical line in the outer margin of the page If you have any questions about this TN or the procedures it describes please contact your nearest Tait Dealer or Customer Service Organisation If necessary you can get additional technical help from Customer Sup port Radio Systems Division Tait Electronics Ltd Christchurch New Zealand Part
16. cuit O C open circuit Control lines XOR inhibit in and inhibit out are not used in normal operation but are provided for use with two T800 02 units for dual tone operation refer to page 9 Squelch Tail Elimination When gate out 2 is released the CTCSS tone output is inverted by the exclusive OR gates for a short period and then returns to its original phase RC time constant formed by C37 C38 and R72 at approx 200ms The T800 Series I transmitter tail time must be set for an appropriate time of less than 200ms normally approx 80ms refer to the appropriate T800 Series I Service Manual This causes a reverse phase burst of CTCSS tone on the transmitter tail which causes mobile receivers to mute faster than normal thus removing most of the squelch noise burst 21st April 1999 Page 17 of 22 TN 566 Reverse Phase Burst This function can be disabled by removing R71 zero Ohm link resistor from the T800 02 PCB Note that this will result in the loss of the 9V pull up to the output at S8 Page 18 of 22 21st April 1999 TN 566 Parts List IPN 225 01202 03 Ref IPN Description Ref IPN Description C1 015 22470 01 CAP CER 0805 CHIP 47P 5 NPO 50V R22 036 14680 00 RES M F 0805 CHIP 6K8 5 C1A 015 21820 01 CAP CER 0805 CHIP 8P2 0 25P NPO 50V R23 036 16390 00 RES M F 0805 CHIP 390K 5 c2 015 06100 08 CAP CER 1206 CHIP 100N 10 X7R 50V R24 036 14100 00 RES M F 0805 CHIP 1K 5 c3 015 23100 01 CAP CER 0805 CHIP 100P
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18. erator frequency and increase the level until the total devi ation is 3 5kHz 500Hz CTCSS deviation Adjust the CTCSS generator to a programmed tone frequency Check that the receiver gate is open the gate LED is on and Tx key is low To Check The Opening Sinad Adjust the receiver gate sensitivity RV100 fully clockwise Reduce the RF signal level to 110dBm 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 Check that the sinad is less than 6dB To Check The CTCSS Tone Output Level Frequency amp Distortion Set the RF signal generator as in 3 Measure the regenerated tone frequency level and distortion at the tone output Adjust RV1 T800 02 and check that the tone level can be adjusted from 0 to at least 1V rms Check that the tone frequency is correct and the distortion is less than 5 To Check The High Pass Filter Set the signal generator output to 70dBm and modulate with 1kHz and CTCSS i e 3kHz plus 500Hz Note the line level 10dBm Reduce the 1kHz generator to zero output and measure the difference in level between the 1kHz and the CTCSS tone Check that this is at least 26dB below the 1kHz level 26dB de emphasised 33dB flat response Transmitter Performance Tests Refer Note 1 to Figure 3 and Figure 13 For narrow band sets use half the stated deviation levels Set u
19. esponse Speech Filter Tone Band Attenuation 200Hz to 250 3Hz 150Hz to 200Hz 67Hz to 150Hz Encoder Transmit Tones Level Flatness Tone Modulation Tone Distortion 67Hz to 100 Hz 100Hz to 250 3Hz Frequency Error From EIA Tones 400Hz to 3 5kHz 1 0 1 5dB rel to 1kHz better than 19dB better than 30dB better than 45dB 1 0V rms nominal 1dB ripple 0 5 to 1 0kHz for 5kHz full rated deviation recommended level is 0 6kHz lt 5 lt 2 5 0 27 maximum refer to Table 1 Circuit Operation Clock Signal Generator A 32 768kHz crystal oscillator provides a reference to the phase input comparator input A of the phase locked loop IC1 The output of the VCO is returned to the phase com parator input B via a ten times divider In this way the VCO oscillates at ten times the crystal frequency 327 68kHz Programmable Dividers IC4 and IC5 form a programmable divide by N This is capable of 12 bit binary pro gramming although only 10 bits are used Programming is achieved by setting the 10 bit DIP switch SW1 or remotely with a T800 07 multichannel EPROM PCB Level Translator A level translator is used on the output of the programmable divider to convert 5V logic to the 9V logic required by IC6 amp IC7 No Tone Defeat Operation This allows remote control of the T800 Series I base station equipment when a CTCSS tone is not required Defeat operation can be activated by pr
20. h SW1 on the T800 02 PCB as shown in Figure 9 CTCSS PCB Figure 9 DIP Switch Programming Non standard Tones 1 Calculate n n 40960 tone frequency required 2 Round off to the nearest whole number 3 Convert to binary code and programme the DIP switch LSB to 1 switch and MSB to 10 switch as shown in Figure 9 Example tone frequency 67 0Hz 40960 611 343 67 therefore n 611 convert n to binary code Bemande Significance Switch Position 8 611 305 1 1 LSB 305 152 1 2 152 76 0 3 76 38 0 4 38 19 0 5 19 9 1 6 9 4 1 7 4 2 0 8 2 1 0 9 1 0 1 10 MSB 21st April 1999 Page 7 of 22 TN 566 EIA Frequency Actual RS220 Frequency MSB Switch Code 10 RR RRR RR rR Rr PrP rPrP CoC OCcooCcoocooorRrRrRrRrF COO CO 00 Oo0O0O0O0OrR RR en ee ee eS OOO 2 OOp RHhRrrRrRrRrO0O00O0rrRRrPO000o0or rrRrROO0O0rRRROO0ro0ororRr O0oo0OoOrroorroo0rrrOoo0 ro0oO0r rO00rorRoOr ROoOr o al OorroroOorororrOoOororrROroo0orrRO0r Oroor o gt POoOrRrRrRPOORrR RR rR rR rR rR rR CO OrRrF OF COrR OFF CO COrR OF OC wo oornoornoooo0ooooronnornrooooronorooa OorrroorPOo0oO0O0O0O0o0rRrRroo0o0oro0orRrrrrRroooo0orOo000rn o co0000000000000000000000000000RrRrR GCOOCCaOCOCCOOOCOCO OR PR RP PRP RP RP RP RP RP RP RP RP A AODOO NO a 0 on 1 off Table 1 Remote Programming Of Encode Decode Tones If remote tone programming is required a 10 wire loom and socket is provided in the
21. imately recon structed Page 16 of 22 21st April 1999 TN 566 The limited input signal is also applied to a third changeover switch of IC7 which switches the inputs to IC9 pin 5 and R47 When the reconstructed signal is negative relative to bias voltage the amplifier has positive gain and when the signal is positive it has negative gain This produces inverted full wave rectification at IC9 pin 7 which is filtered by R50 and C28 D2 forms a positive clamp and Q2 a negative clamp to limit the excursions of the detected signal This reduces the effect of ripple which occurs due to the small frequency difference that may exist between sampling signals and incoming tones Threshold Detector The rectified and filtered output is fed into a comparator with a threshold of approxi mately 0 35V set by R53 When a tone is detected the output at IC9 pin 14 is low Gate Output Logic Two outputs are provided to either key a transmitter gate output 2 or to mute a receiver gate output 1 and an inhibit is provided if the received signal is not strong enough Rx gate input Defeat logic is also provided which enables the tone decoder to be bypassed for tests etc i e earthing effectively removes decoder operation Defeat Rx Gate Decoded GateOut GateOut Rx Mute Tx Input Tone 2 1 open keyed closed off closed off closed off open keyed open keyed closed off closed off 0 1 0 1 0 1 0 1 S C short cir
22. iver CTCSS Wiring Details Note 3 If fitting a T800 02 PCB to a T800 Series I module already fitted with a T800 07 multichannel PCB remove C19 from the T800 PCB Page 2 of 22 21st April 1999 TN 566 Connect Audio E 36 Gnd Lo Audio 2 S4 CTCSS Tone D P Line 1 P1 Line 1 P4 S7 9V Exciter Transmitter T800 02 Figure 3 Transmitter CTCSS Wiring Details Remove Interconnection S1 Speech amp Tone I P S6 Gnd S4 CTCSS Tone O P S2 Speech O P S5 Rx Gate I P S13 Gnd S7 9V Tx En Opt O S8 Gate O P 2 Exciter Transmitter T800 02 Receiver Figure 4 Talk Through Repeater Wiring 21st April 1999 Page 3 of 22 TN 566 Fitting The T800 02 To A T700 T800 02 PCB Modifications 1 Replace R78 with the 10k chip resistor provided and solder the 12k resistor between S8 and ground as shown in Figure 5 2 Remove the wire from S5 and solder the two 1N4531 diodes between S5 and the end of the wire as shown in Figure 6 and Figure 8 Slide a length of silicone rubber sleeving over the two diodes Note Orientate the diodes so that the diode cathodes face away from the T800 02 PCB ay ss Replace R78 ul C8 12k resistor a Gee 7 s8 es Ca INAS ie AN E z 2 5 Figure 5 T800 02 PCB Layout Bottom Side CTCSS TONE OUTPUT SPEECH OUTPUT GND 9V y GATE OUTPUT 2 2 x 1N4531 diodes sleeved SPEEC
23. oviding a high frequency output of about 164kHz from the programmable divider IC4 and IC5 This is achieved by selecting divide by two on the bit switch SW1 or via the remote lines to the T800 07 21st April 1999 Page 15 of 22 TN 566 EPROM A divide by two output from the T800 07 occurs when the EPROM is pro grammed by PGM800 without the selection of a CTCSS tone PGM800 V2 01 after April 1991 only R80 C39 and Q6 act as an integrator to detect the high frequency output from IC4 and IC5 and pull the defeat line S9 low The resultant 20kHz tone is prevented from appearing at the CTCSS tone output 54 by the CTCSS filter IC9 Divide By Eight Decoder Sine Wave Synthesiser IC6 is a divide by eight decoder The outputs at Q1 to Q5 are progressively shifted 45 at each stage and ripple through the counter with each clock pulse Q4 is tied to the data input to provide a divide by eight function The outputs are now at the CTCSS tone fre quency Q1 and Q3 which are in quadrature 90 set the centre frequency of the com mutating filter CTCSS Tone Encoder Outputs Q1 Q2 amp Q3 from IC6 are fed into the inputs of three exclusive OR gates IC10 The other inputs to these gates are common and connect to gate output 2 A change at gate output 2 produces a phase inversion at the EXOR outputs i e when gate output 2 releases the encoder tone phase inverts for a short period approx 200ms then returns to its original phase R
24. p the T800 Series I transmitter and receiver as detailed in the appropriate Service Manual and then fit the T800 02 Page 12 of 22 21st April 1999 TN 566 Line O P 1 Line I P 1 Rx Ex Line O P 4 Gate I P 4 Figure 13 D Range Connections T800 02 Mounted In Exciter Set up the test equipment as shown in Figure 14 Speech amp Tones From Receiver T800 RF Signal T800 O Transmitter Modulation Generator Receiver T800 02 Meter l Speech Out Distortion Meter Combining Pad Audio Generator CTCSS Figure 14 Transmitter Test Set Up To Check Decoder Operation Set the RF signal generator output to 70dBm Modulate the generator with the audio oscillator at a level to give 3kHz devia tion at 1kHz CTCSS generator set to zero output Monitor the CTCSS generator frequency and increase the level until the total devi ation is 3 5kHz 500Hz CTCSS deviation Adjust the CTCSS generator to a programmed tone frequency Check that the transmitter is now keyed and the key LED is on To Check The Opening Sinad Adjust the receiver gate sensitivity RV100 fully clockwise Reduce the RF signal level to 110dBm Observe the sinad meter and reduce the RF level until the transmitter key is removed Slowly increase the signal level until the transmitter is keyed and stays keyed Check that the sinad is less than 6dB To Check The CTCSS Tone Output Level amp Distortion Set the
25. ries Refer to Figure 2 Note For narrow band sets use half the stated deviation levels 1 Set the receiver RF mute pot RV100 to the required threshold e g 20dB sinad 2 Set the receiver line level pot RV102 for 10dBm using a steady received RF sig nal at approximately 70dBm 3 Programme the required CTCSS tone 4 Adjust RV1 on the T800 02 PCB to provide 600Hz nominal tone deviation of transmitter modulation 5 Transmitter Deviation This must be reset so that the maximum deviation for both audio and CTCSS does not exceed 4 7kHz Adjust the transmitter line sensitivity pot RV100 fully clockwise Adjust the transmitter deviation pot RV106 to set the maximum total deviation of the CTCSS tone and 1kHz AF to 4 7kHz Sweep the audio frequency from 100Hz to 4kHz and ensure that the maximum deviation does not exceed 4 7kHz Readjust RV106 if necessary Readjust the line sensitivity for 3kHz deviation 6 Transmitter Tail Timer The transmitter tail timer must be set up if reverse phase burst is required Adjust RV202 to obtain the required tail setting approximately 80ms as follows e Observe the Tx Reg line of the transmitter with an oscilloscope and trigger on the rising edge of the Tx Key scope 2V div 20ms div normal trigger e Adjust RV202 fully clockwise and then adjust anticlockwise while keying the transmitter on off until the required tail is obtained e Alternatively change
26. s Required The T800 02 CTCSS kit should contain the following items for fitting the T800 02 PCB to a T800 Series I receiver or transmitter 1 x T800 02 CTCSS PCB 2 x M3x8 pan Torx screws 1 x wiring loom complete with socket You will also need the following components if fitting the T800 02 PCB to a T700 radio 1 x 10k chip resistor 2 x 1N4531 diodes 1 x 12k resistor 180mm x double sided foam tape Tait Electronics Ltd Page 1 of 22 558 Wairakei Rd PO Box 1645 Christchurch New Zealand Phone 64 3 358 3399 Fax 64 3 358 3903 TN 566 Fitting The T800 02 To A T800 Series 1 Mount the T800 02 PCB in the T800 Series I receiver or transmitter as shown in Figure 1 M3x8 Screws T800 02 PCB Figure 1 T800 02 To T800 Series I Mounting Details 2 Connect the T800 02 to the audio and power supply points in the audio processor as shown in Figure 2 receivers or Figure 3 and Figure 4 transmitters Note 1 For older model receivers without MUTE I PA replace R160 with a zero ohm resistor and connect S3 to MUTE I P refer to Technical News No 51 Note 2 For T825 receivers connect S3 to MUTE I P2 Internal Wiring Audio 2 Pad 122 O S4 CTCSS Tone Output S6 Ground S7 Supply 9V S2 Speech Output S1 Speech and Tone Links PL105 4 5 Input PL106 2 3 Rx Gate Out O S5 Rx Gate Input Via D Range Mute I P A S3 Gate Output 1 Exciter Receiver T800 02 Figure 2 Rece
27. un in the direction shown by the arrows in Figure 8 If the T700 is not fitted with a 600 Ohm interface PCB stick two of the lengths of tape together so that they can be used as a double thickness Position the tape on the bottom of the T800 02 PCB as shown in Figure 8 with the double thickness on the side that will be closest to the unfolded control PCB Position the T800 02 carefully so that none of its components come into contact with parts on the closed control PCB Avoid contact with the 32V regulator coil by placing the CTCSS PCB hard up against the chassis support flange indicated in Figure 8 and as close as possible to the centre line of the radio Ensure that the T800 02 does not come into contact with the 600 Ohm inter face PCB fixing screw indicated in Figure 8 The M3x8 Taptite screws provided in the kit are for fitting a T800 02 PCB to a T800 Series I radio and can be discarded When fitting the T800 02 PCB to a T700 that is equipped with the Talk Through option the following modifications are necessary to restrict Talk Through to valid CTCSS only e Cut the track between R1 10kQ and the connector PL7 on the Talk Through PCB e Connect a wire between pad S12 on the T800 02 and the connector side leg of R1 Page 6 of 22 21st April 1999 TN 566 Programming Refer to Table 1 and Figure 9 The DIP switch codes for standard EIA tones are set out in Table 1 on the following page Programme the DIP switc
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