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MT-3 FM Transmitter Mainboard Instruction Manual

IM20-MT3TXMN

Illustrations and Schematics

fm audIo ProCeSSor Board ComPonent layout dIaGram

BOTTOM SIDE

TOP SIDE

daniels

elecTronics lTd

DATE: 19 JAN 2010

TITLE: FM AUDIO PROCESSOR BOARD - VHF LOW BAND

BOARD NO: 43-911923
REV DATE:

DWG No: 03-T-01-01

- JUMPERS INSTALLED

JU41

JU4

JU17

JU36

JU2

JU14

JU20

JU27

JU5

JU1

JU15

JU12

JU9

JU39

JU34

JU21

JU25

JU19

JU22

JU6

JU8

JU32

JU31

JU18

JU37

JU38

JU29

JU7

JU23

JU28

JU13

JU10

JU16

JU33

JU11

JU42

JU43

JU44

JU45

JU26

JU3

Y JU24

JU35

4.7µF

C26

4.7µF

R73

N/I

18k2

R56

0R0

10nF

0R0

1.0µF

1M0

R64

100k

R30

604R0

R74

N/I

2k21

C10

10nF

R11

2k21

R10

49k9

2k21

R57

N/I

R40

49k9

R52

100k

R26

N/I

R25

5k11

R49

16k2

R15

10k0

C20

10nF

C36

330nF

R13

10k0

R20

11k8

R28

N/I

R81

N/I

C18

100nF

C17

10nF

R17

11k8

R18

N/I

R34

49k9

C23

330pF

R16

100k0

C41

10nF

R45

N/I

R44

0R00

R53

N/I

R32

51k1

R54

10k0

C12

1.0nF

R50

49k9

C24

10nF

C45

4.7µF

R35

1K00

R12

N/I

R79

49k9

R22

49k9

R21

49k9

R55

49k9

1µF

C21

1µF

R58

0R00

R72

0R00

R37

49k9

R77

20k0

R75

10k0

BC817-25

R68

3k48

R69

2k00

R66

16k2

R67

56k2

4.7µF

R63

5k0

LTC1569-6

R42

5k0

R31

5k0

R38

5k0

R48

100k0

R14

N/I

R29

50k0

MC33174

R36

50k0

FB1

TC4S66F

SA571D

C13

47uF

C29

47uF

C31

47uF

MC33174

TC4S66F

R83

50k0

C48

4.7µF

C50

4.7µF

C42

680nF

R23

N/I

R24

N/I

R85

10k0

R78

10k0

C49

10nF

R86

10k0

C27

100nF

49k9

R65

100k

R71

5k11

R46

4k53

C14

10nF

C43

150pF

R84

10k0

R82

10k0

C19

330nF

R43

11k8

R47

100k

R33

100k

R59

221K

R41

137k

R51

10k0

R62

15k4

R76

16k2

1µF

C30

1µF

1.0µF

C25

1µF

C35

1.0µF

C39

680nF

R39

13k3

R60

18k2

R61

18k2

R80

27k4

C28

4.7µF

C51

1.0µF

C16

1.0µF

C46

1.0µF

C47

1.0µF

C33

1.0µF

C22

10nF

R70

10k0

C44

N/I

C40

1.0µF

R88

49k9

C52

150pF

C53

4.7µF

C54

100nF

C55

100nF

C56

33nF

R89

100R

R27-SMD

10k

R19-SMD

N/I

C38

3.3nF

C37

3.3nF

C32

N/I

C15

3.3nF

R19-THD

N/I

C34

1.0 uF

R27-THD

N/I

R1 J1

R2 K3

R3 H1

R4 J1

R5 I2

R6 J2

R7 H2

R8 E2

R9 E2

R10 H2

R11 G2

R12 A1

R13 F1

R14 O3

R15 F1

R16 E1

R17 D2

R18 E2

R19 Q4

R20 E1

R21 B2

R22 A2

R23 C1

R24 C1

R25 D2

R76 I1

R77 C2

R78 D1

R79 C2

R80 A1

R81 C1

R82 G2

R83 S3

R84 E1

R85 C1

R86 D1

R87 M4

R88 E2

R89 D1

C51 F2

C52 G1

C53 N4

C54 G2

C55 A2

C56 B2

FB1 K4

JU1 F1

JU2 H2

JU3 C1

JU4 H1

JU5 G1

JU6 A2

JU7 A1

JU8 A2

JU9 F2

JU10 F1

JU11 I1

JU12 F1

JU13 F1

JU14 G2

JU15 F1

JU16 G1

JU17 I2

JU18 B2

JU19 B1

JU20 H1

JU21 C2

JU22 A1

JU23 D1

JU24 E2

JU25 B1

JU26 E1

JU27 H1

JU28 D2

JU29 B2

JU30 N/A

JU31 B1

JU32 A2

JU33 G2

JU34 D2

JU35 D2

JU36 J2

JU37 D2

JU38 C1

JU39 D1

JU40 N/A

JU41 C1

JU42 H2

JU43 D2

JU44 B2

JU45 B2

P1 L4

P2 O4

P3 S4

P4 R4

P5 Q3

P6 T4

P7 Q4

P8 T3

P9 A1

P10 A1

P11 B1

P12 A1

Q1 C2

R26 C2

R27 P3

R28 E1

R29 S3

R30 J2

R31 M3

R32 C1

R33 H1

R34 D1

R35 A1

R36 T3

R37 C2

R38 N3

R39 I1

R40 F2

R41 I1

R42 R3

R43 G1

R44 D1

R45 D1

R46 F2

R47 G1

R48 O3

R49 G1

R50 B1

R51 I1

R52 F2

R53 D1

R54 C1

R55 B2

R56 J1

R57 G2

R58 B1

R59 I1

R60 H1

R61 H1

R62 J1

R63 N3

R64 I2

R65 G2

R66 A2

R67 A2

R68 A2

R69 A1

R70 H2

R71 G1

R72 B1

R73 I2

R74 I2

R75 C2

C26 H1

C27 B2

C28 S4

C29 Q3

C30 I1

C31 R4

C32 M4

C33 S4

C34 S3

C35 I1

C36 E2

C37 P4

C38 O4

C39 G1

C40 T4

C41 D1

C42 M4

C43 E1

C44 E1

C45 B1

C46 T4

C47 T4

C48 P3

C49 D2

C50 P3

COMPONENT LOCATION TABLE

DES LOC DES LOC DES LOC DES LOC DES LOC DES LOC DES LOC DES LOC DES LOC

C1 I1

C2 J1

C3 O3

C4 J1

C5 J2

C6 A2

C7 L4

C8 J2

C9 I1

C10 G2

C11 N/A

C12 C1

C13 K4

C14 F1

C15 L4

C16 M4

C17 E1

C18 F2

C19 H2

C20 G2

C21 A1

C22 H2

C23 E1

C24 C1

C25 H1

DES LOC

U1 L3

U2 N3

U3 R3

U4 T3

U5 R3

U6 S3

DES LOC
TP1 F1

TP2 B1

TP3 I2

TP4 J1

TP5 C1

TP6 G2

TP7 D2

TP8 D1

TP9 C1

TP10 D1

TP11 I1

TP12 G1

TP13 H2

TP14 C1

DES LOC

P10

P11

TP3

TP11

TP4

TP12

TP7

TP9

TP6

TP1

TP10

TP2

P12

TP13

TP5

TP14

MICROPHONE

INPUT LEVEL

CONTROL

BALANCED

INPUT LEVEL

CONTROL

BALANCED

COMPRESSION

CONTROL

MICROPHONE

COMPRESSION

CONTROL

AUXILIARY

INPUT LEVEL

CONTROL

4.0V

VOLTAGE

ADJUST

SUBTONE 1

INPUT LEVEL

CONTROL

DEVIATION

CONTROL

TCXO

DC LEVEL

ADJUST

TCXO

MODULATION

LEVEL ADJUST

INPUT

DC LEVEL

ADJUST

TP8

30 AWG WIRE JUMPER

PCB

TRACE CUT

R87

50k0

Summary of Contents for MT-3 Series

Page 1: ...means electronic mechanical photocopying recording or otherwise without the prior written consent of Daniels Electronics Ltd The stylized Daniels Electronics Ltd and DE logo are registered Canadian a...

Page 2: ...identify the significance of a revision Each element of the revision number signifies the scope of change as described in the diagram below DOCUMENT REVISION DEFINITION Major Revisions The result of...

Page 3: ...ard Interconnection Pin Definitions 26 FM Audio Processor Alignment 27 Troubleshooting 31 Temperature Compensation 32 FM Audio Processor Jumper Configurations 32 Illustrations and Schematics 35 MT 3 F...

Page 4: ...iv MT 3 FM Transmitter Mainboard Instruction Manual IM20 MT3TXMN This Page Intentionally Left Blank...

Page 5: ...the amplifier and the synthesizer modules are frequency band sensitive plug in modules Circuitry and jumpers on the transmitter mainboard control the operation of the modules as well as the overall o...

Page 6: ...2 MT 3 FM Transmitter Mainboard Instruction Manual IM20 MT3TXMN This Page Intentionally Left Blank...

Page 7: ...Emissions Conducted Spurious 90 dBc 80 dBc VSWR Protection 20 1 VSWR at all phase angles Operating Temperature Range 30 C to 60 C Operating Humidity 95 RH non condensing at 25 C Operating Voltage 13...

Page 8: ...s standard MT 3 Repeater Subrack Subracks modules comply with IEEE 1101 DIN 41494 and IEC 297 3 mechanical size modular arrangement External Connections RF Connection Type N connector located on the m...

Page 9: ...en SW1 is in the OFF position the transmitter is turned off however 13 8 VDC is still present on the transmitter mainboard as the 13 8 VDC supply is not switched When SW1 is in the KEYED position 9 5...

Page 10: ...of U2a goes low which triggers the transmitter s TOT located on the FM Audio Processor The TOT s output is AND ed with the MIC PTT NTO signal U2c and the PTT NTO signal U2d When any one of the preced...

Page 11: ...for the synthesizer module PTT input Q4 Turns on Q5 which turns on the 9 5 VDC Switched supply Q6 Turns on Q7 which turns on the 9 5 VDC PTT Switched supply The 9 5 VDC Switched supply Q5 can also be...

Page 12: ...and balanced audio compression amplifiers will be disabled eliminating the use of the front panel microphone jack for local microphone operations With this configuration the balanced audio is routed a...

Page 13: ...B18 and Z18 by a transformer T1 Two audio outputs from the FM Audio Processor are routed to the synthesizer modules Microphone Audio Normally the microphone audio is sent from the attached transmitter...

Page 14: ...orward and reverse power sense lines to the backplane connector pins B26 and Z26 respectively The forward and reverse power sense lines from the amplifier can be open collector or linear outputs depen...

Page 15: ...t side of the transmitter mainboard J32 J31 J29 J28 J26 J27 Minutes I I I I I I 0 01 I I I I I N I 0 01 I I I I N I I 0 01 I I I N I I I 0 01 I I I N I I N I 0 02 I I N I I I I 0 02 I I I N I N I I 0...

Page 16: ...s in transmitter deviation over temperature caused by changing characteristics of synthesizers and oscillators A single chip 10th Order Linear Phase Low Pass Splatter Filter for increased cut off atte...

Page 17: ...ch 2 Regular Modulation Buffer Subtone 1 3 KHz Direct Modulation Offset Buffer TCVCXO Modulation Buffer Offset TCVCXO DC Level Adjust Reg Mod Out Low Freq Out Inverting Amp Coupling Select 2 Port Pola...

Page 18: ...z tone at 18 dBm gives 500 Hz All Other Audio Inputs Disabled Interconnection Pin Layout Diagram PCB 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 P1 P2 P4 P3 Balanced Input END VIEW Mic Input Subtone Inp ut 1 8V 9...

Page 19: ...low frequency modulation capabilities of the synthesizer module The DIRECT MODULATION inputs on the J1 control connector of the MT 3 Motherboard will be used B20 for TX A and A20 for TX B Turn on Tim...

Page 20: ...nse jumper JU1 at Y and X position respectively FM Audio Processor Balanced Input The 600 balanced input uses the ALC pre amplifier U1B with input level control pot R31 The balanced input level contro...

Page 21: ...ion Output port while Subtone 2 is used for DCS Both subtone inputs have an input level control In order to maintain a uniform frequency response from 50 Hz to 300 Hz dual port modulation techniques a...

Page 22: ...CROPHONE COMPRESSION CONTROL X Y X Y X Y FLAT AUDIO PRE EMPHASIS X Y TWO PORT POLARITY SUBTONE 1 INPUT CONTROL LEVEL 3 P1 2 P1 1 P1 4 P1 3 P3 3 P2 1 P2 4 P2 9 5V CONTINUOUS C10 10nF 4K53 R46 C5 10nF 1...

Page 23: ...el temperature compensation for synthesizer sensitivity variations Due to the many different characteristics of various synthesizers many components are selected for best performance over the temperat...

Page 24: ...D FOR DIGITAL MOD AUXILIARY INPUT LEVEL CONTROL X Y MICROPHONE AGC PREAMP BALANCED AGC PREAMP hi gh w i deband sel ect l ow nar r ow band sel ect X Y BALANCED COMPRESSION CONTROL FLAT AUDIO PRE EMPHAS...

Page 25: ...rrying half the audio level as determined by resistive divider comprised of R22 and R21 X Y DEVIATION CONTROL LOW FREQUENCY DIRECT MODULATION OUTPUT X Y X Y X Y 10 POLE LOWPASS FI LTER X Y X Y VOICE S...

Page 26: ...22 MT 3 FM Transmitter Mainboard Instruction Manual IM20 MT3TXMN This Page Intentionally Left Blank...

Page 27: ...sing an ordinary soldering iron Removal and replacement of surface mount components should be performed only with specifically designed surface mount rework and repair stations complete with Electrost...

Page 28: ...ppm frequency tolerance General Information Before proceeding with the transmitter alignment check that the appropriate jumpers are installed See Standard Factory Settings and Jumper Configuration sec...

Page 29: ...talled Amplifier power sense output configuration J13 X Amplifier power sense output configuration J14 X Amplifier power sense output configuration J15 X Amplifier power sense output configuration J16...

Page 30: ...o the MT 3 Motherboard Pin Name Pin Name Pin Name D2 No Connect B2 13 8 VDC Z2 13 8 VDC D4 No Connect B4 MIC Out Z4 MIC In D6 No Connect B6 9 5 VDC Z6 9 5 VDC D8 No Connect B8 Relay Positive Z8 Relay...

Page 31: ...tter is most commonly set up for a single frequency operation there are times when an application requires multiple frequencies per transmitter This also changes the standard tuning procedure slightly...

Page 32: ...AF Gen 1 kHz Tone 18 dBm 5 R42 Subtone1 Adjust and measure 500 Hz Deviation Monitor 6 OST 3H035 2 Port OST 3H045 2 Port Change AF Gen freq AF Gen 40 Hz 18 dBm 7 R36 TCXO Adjust and measure 500 Hz 8 Su...

Page 33: ...d measure Distortion Analyzer AF Filter 15 kHz 4 0 THD 19 Microphone Input Front Panel Pin 2 Change level AF Gen 1 kHz Tone 10 dBm 20 R2 Microphone Adjust and measure 3 kHz Deviation monitor 21 Microp...

Page 34: ...3H035 2 Port OST 3H045 2 Port Change AF Gen freq AF Gen 40 Hz 18 dB 7 R36 TCXO Adjust and measure 500 Hz 8 Subtone 1 input Change AF Gen freq AF Gen 300 Hz 18 dBm 9 Deviation Monitor Should measure 50...

Page 35: ...Test Subtone Measured 1 8 kHz 10 dBm 1 kHz 8 dBm 1 kHz 10 dBm 100 kHz 18 dBm TP3 5 2 V P P 3 8 V P P N A N A TP12 N A N A 3 8 V P P N A TP10 6 5 V P P 4 9 V P P 4 8 V P P 1 1 V P P TP5 2 4 V P P 1 3 V...

Page 36: ...a constant transmitter audio deviation with a fixed level input signal It is capable of not only compensating for temperature related level variations within the audio processor typically 0 3 to 0 5 d...

Page 37: ...XY X Audio Gate Switch X X X 22 XY Y Splatter Filter Enable Bypass Y Y Y 23 Single Open Narrow Band Gain Reduction Open Open Open 24 XY Factory Custom Temperature Compensation Network Contact Factory...

Page 38: ...MT 3 FM Transmitter Mainboard Instruction Manual IM20 MT3TXMN 34 This Page Intentionally Left Blank...

Page 39: ...ring convention in which the last two digits of the circuit board number represent the circuit board version All PCBs manufactured by Daniels Electronics Ltd are identified by one of the following num...

Page 40: ...ED J12 R25 27K4 R26 1K0 Q10 PZT2222A J14 J15 J13 FUSE OPTIONAL 9 5 VDC CONTINUOUS J9 SQL DE EMP INPUT MIC OUT MIC IN BALANCED INPUT SIDE 2 600 OHMS BALANCED INPUT SIDE 1 SUBTONE INPUT 1 SUBTONE INPUT...

Page 41: ...LPF22 B B4 LPF23 B B3 LPF24 B B3 LPF25 B B3 LPF26 B B3 LPF27 B B3 LPF28 B B2 LPF29 B B2 LPF30 B B2 LPF31 B B2 LPF32 B B2 LPF33 B B1 LPF34 B B1 LPF35 B B1 Q1 B E6 Q3 B E5 Q4 B F5 Q5 B F4 Q6 B E5 Q7 B E...

Page 42: ...PF3 B B7 LPF4 B B7 LPF5 B B7 LPF8 B B6 LPF10 B B6 LPF12 B B6 LPF15 B B5 LPF18 B B4 LPF19 B B4 LPF20 B B4 LPF21 B B4 LPF22 B B4 LPF23 B B3 LPF24 B B3 LPF25 B B3 LPF26 B B3 LPF27 B B3 LPF28 B B2 LPF29 B...

Page 43: ...1 3 X Y Y X Y X Y X Y UNDER U6 X Y X Y X Y JA5 1 JA5 2 JA5 3 JA5 4 JA2 4 JA3 1 JA4 2 JA3 2 JA4 4 JA1 4 JA3 3 JF2 3 JF2 4 JF1 4 JA3 4 JA2 3 JA4 3 JA4 1 JA2 1 JA2 2 JA1 1 JA1 2 JA1 3 JF1 1 JF1 3 JF2 2 J...

Page 44: ...E REVISED BY REV DANIELS ELECTRONICS LTD TM VICTORIA BC SW1 PF3 MIC J2 D1 C1 HIGHEST REFERENCE DESIGNATORS UNUSED REFERENCE DESIGNATORS 03 JUL 03 SHANE AEBISCHER 1 2 43 921212 M GAUBE 07 APRIL 92 MT 3...

Page 45: ...4 1 2 3 C38 3 3nF P2 P3 P4 C37 3 3nF C32 N I P1 P5 P8 P6 P7 C15 3 3nF R19 THD N I C34 1 0 uF R27 THD N I R1 J1 R2 K3 R3 H1 R4 J1 R5 I2 R6 J2 R7 H2 R8 E2 R9 E2 R10 H2 R11 G2 R12 A1 R13 F1 R14 O3 R15 F...

Page 46: ...TER Y X Y X Y X 10 POLE LOWPASS FILTER Y X Y X OPTIONAL Y X BALANCED AGC PREAMP MICROPHONE AGC PREAMP Y X AUXILIARY INPUT LEVEL CONTROL NOT INSTALLED FOR DIGITAL MOD 9 5V CONTINUOUS Y X Y X Y X Y X LO...

Page 47: ...5A104K5R C10 CAP 1uF CER 2225 5 50V X7R 1008 6H105J5R C12 CAP 10nF CER 0805 10 50V X7R 1008 4A103K5R C13 CAP 10nF CER 0805 10 50V X7R 1008 4A103K5R C14 CAP 10nF CER 0805 10 50V X7R 1008 4A103K5R C15 C...

Page 48: ...T PF2 HEADER 1 R A 2 ROW X 2PIN 5010 H202RA9T PF3 HEADER 1 R A 2 ROW X 2PIN 5010 H202RA9T Q1 TRANSISTOR BC817 25 NPN SOT23 2120 BC817025 Q3 TRANSISTOR BC817 25 NPN SOT23 2120 BC817025 Q4 TRANSISTOR BC...

Page 49: ...K1 0805 1 100ppm 1150 4A6812FP R34 RES SM 27K4 0805 1 100ppm 1150 4A2742FP R35 RES SM 27K4 0805 1 100ppm 1150 4A2742FP R36 RES SM 221K 0805 1 100ppm 1150 5A2213FP R37 RES SM 1K00 0805 1 100ppm 1150 3A...

Page 50: ...EXAN 14HP VHF ORANGE 3536 10101405 1 LBL LOCKWASHER M3 SPLIT A2 STEEL 5814 3M0LK00S 4 EA NAMEPLATE BLANK 14HP ALUM 3702 10001214 1 EA NUT M2 5 HEX 5 0mm FLATS A2 for CONN1 5813 2M5HX50S 2 EA NUT M2 5...

Page 51: ...uF C 1206 80 20 25V X7R 1008 6B105Z3R C5 CAP 10nF CER 0805 10 50V X7R 1008 4A103K5R C6 CAP SM 1uF TANT 20 16V 1055 5A105M16 C7 CAP 680nF CER 1206 20 25V X7R 1008 5B684M3R C8 CAP SM 4 7uF TANT 10 16V 1...

Page 52: ...0 25V X7R 1008 6B105Z3R C47 CAP 1uF C 1206 80 20 25V X7R 1008 6B105Z3R C48 CAP SM 4 7uF TANT 10 16V 1055 5B475K16 C49 CAP 10nF CER 0805 10 50V X7R 1008 4A103K5R C50 CAP SM 4 7uF TANT 10 16V 1055 5B475...

Page 53: ...ppm 1150 4A4992FP R35 RES SM 1K00 0805 1 100ppm 1150 3A1001FP R36 POT SM 4mmSQ 50K MUL TRN SIDE 1174 DM3503J0 R37 RES SM 49K9 0805 1 100ppm 1150 4A4992FP R38 POT SM 4mmSQ 5K0 MUL TRN SIDE 1174 DM2502J...

Page 54: ...ES SM 16K2 0805 1 100ppm 1150 4A1622FP R77 RES SM 20K0 0805 1 100ppm 1150 4A2002FP R78 RES SM 10K0 0805 1 100ppm 1150 4A1002FP R79 RES SM 49K9 0805 1 100ppm 1150 4A4992FP R80 RES SM 27K4 0805 1 100ppm...

Page 55: ...sion 1 8 2 2 2 3 Audio Processors Issue 4 contains no AM information the document title is changed to reflect coverage of only FM transmitters 699 For VT 3H035 VT 3H045 transmitters to reduce spurious...

Page 56: ...eferences 6113 VT 3 140 Audio Processor select value table updated 6115 VT 3 160 Audio Processor select value table updated 4 5 0 Feb 06 6129 UT 3 420 SXCX00 Audio Processor select value table updated...

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