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Daniels Electronics Ltd. MT-3 Instruction Manual

Am transmitter main board
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MT-3 RADIO SYSTEMS
Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels
Electronics Ltd.
DE™ is a registered trademark of Daniels Electronics Ltd. registered in the United States Patent
and Trademark Office.
Issue: 3
Previous Issue:
Issue Date:
December 98
Printing Date: N/A
Part No.:
IM22-MT3AMTXMN
DANIELS
ELECTRONICS LTD.
MT-3 AM TRANSMITTER
MAIN BOARD
INSTRUCTION MANUAL
A22-VAP130 AM Audio Processor Version 04
A21-TX3-00 TXMAIN/FPB Common Asembly Version 1.7
2
Previous Issue Date: March 98
Covers:
TM
Daniels Electronics Ltd.
Victoria, BC
PRINTED IN CANADA

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  • Page 1 DANIELS ELECTRONICS LTD. MT-3 RADIO SYSTEMS MT-3 AM TRANSMITTER MAIN BOARD INSTRUCTION MANUAL Covers: A22-VAP130 AM Audio Processor Version 04 A21-TX3-00 TXMAIN/FPB Common Asembly Version 1.7 Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be...
  • Page 2 Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual. DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 3: Table Of Contents

    Printed Circuitboard Numbering Convention........3-1 Recommended Test Equipment List ..........3-1 Standard Factory Settings and Jumper Configuration ......3-2 3.5.1 MT-3 AM Transmitter Board Factory Configuration ....3-2 3.5.2 MT-3 AM Audio Processor Factory Configuration..... 3-3 MT-3 AM Transmitter Board Alignment .......... 3-3...
  • Page 4 MT-3 AM Transmitter Board Electrical Assembly....... 5-3 5.2.1 MT-3 AM Transmitter Main Board Component Layout (Top)..5-3 5.2.2 MT-3 AM Transmitter Main Board Component Layout (Bottom) ... 5-4 5.2.3 MT-3 AM Transmitter Main Board Schematic Diagram ....5-5 MT-3 Front Panel Board............5-6 5.3.1...

  • Page 5: General

    Circuitry and jumpers on the Transmitter Main Board control the operation of the modules as well as the overall operation of the MT-3 transmitter. Power and signal connections are made to the 48 pin type 'F' connector on the rear of the Transmitter Main Board and are routed to the other modules.

  • Page 6: Audio Specifications

    Audio Response: Flat audio; +1/-3 dB: 300 Hz - 3 kHz Audio Distortion: Less than 3% -40˚C to +60˚C at 30% modulation Less than 5% -40˚C to +60˚C at 90% modulation DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 7: Theory Of Operation

    2 . 1 . 2 . 1 Microphone PTT Jumper J1 on the MT-3 Front Panel Board configures the microphone's PTT input (MIC PTT) to either bypass or activate the transmitter's TOT. Soldering jumper J1 in the 'x' position (default) selects the MIC PTT NTO line which bypasses the TOT.

  • Page 8: Ptt With Time-Out-Timer

    WTO or the MIC PTT WTO is activated the output of U2a goes low which triggers the transmitter's TOT located on the MT-3 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 preceding three signals (TOT's output, MIC PTT NTO, PTT NTO) go low the transmitter is activated by transistors Q1 to Q7 which switch power to the various modules.

  • Page 9: Ptt Output

    '+9.5 Vdc Switched' supply, jumper J7 which selects the power source for the MT-3 AM Audio Processor and jumper J18 which selects the enable line for the OST- 3A128 Synthesizer or OCT-3 Crystal Control Module.

  • Page 10: Audio Circuits

    The audio lines routed to the audio processor are: a 600 ohm balanced input (pins B18 and Z18), and a MIC AUDIO from the MT-3 FRONT PANEL BOARD. It is here that the MIC audio is processed in the same manner as the 600 ohm balanced audio.

  • Page 11: Microphone Audio

    Transmitter Main Board can be configured by the MIC IN and MIC OUT lines so that the audio from an external microphone modulates transmitter. The configuration of the MIC IN (pin Z4) and MIC OUT (pin B4) lines on the MT-3 Transmitter Board are controlled by jumpers J16 and J17 respectively.

  • Page 12: Amplifier Circuits

    2 . 2 MT-3 Front Panel Board The MT-3 Front Panel Board is a subsection of the MT-3 AM Transmitter Board which is used to mount the front panel switch, diode, and microphone connector. The main purpose of the board is to eliminate a wiring harness for the front panel components.

  • Page 13: Audio Circuitry

    2 . 3 . 3 Audio Circuitry The MT-3 AM Tx Audio Processor refer to section 5.4.2 "MT-3 AM Audio Processor Schematic Diagram" has two audio inputs (Microphone input and Balanced input) which can be used to modulate the transmitter. The input signals are combined by R2 and R17 at a compandor U1.

  • Page 14: Ptt Time-Out-Timer

    JU27= E JU27= E 0.01 0.01 0.01 0.02 0.03 0.01 0.04 0.06 0.02 0.08 0.12 0.05 0.15 0.23 0.10 0.31 0.47 0.19 0.62 0.94 0.38 1.25 1.88 0.75 3.75 5 . 0 DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 15: Transmitter Alignment

    B30, Z30, B32, and Z32. Transmitter balanced audio (600 Ω) is available at pins B18 and Z18. 3 . 2 Repair Note MT-3 Transmitter modules are mainly made up of surface mount devices which should not be removed or replaced using 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 ElectroStatic Dissipative (ESD) protection.

  • Page 16: Standard Factory Settings And Jumper Configuration

    MT-3 AM series transmitter are given below. 3 . 5 . 1 MT-3 AM Transmitter Board Factory Configuration The MT-3 AM Transmitter Main Board is factory configured as follows: • Transmitter standby mode 3 • Optional relay not installed. The corresponding jumper settings are: •Jumper J2:...

  • Page 17: Am Audio Processor Factory Configuration

    In a standard configuration, the only alignment required on the MT-3 AM Transmitter Main Board for a synthesized transmitter is to set the frequency switches (FSW1, FSW2, FSW3, and FSW4) for the desired channel frequency. FSW1 is the most significant digit of the frequency switches.

  • Page 18: Am Transmitter Board Test Points

    Transmitter Main Board, push the module down, taking care to ensure the connector pins on the bottom of the Synthesizer or Crystal Controlled Oscillator module are not bent. DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 19: Am Audio Processor Alignment

    3 . 8 . 1 General Verify the standard factory settings for the MT-3 AM Audio Processor as given in section 3.5.2 before beginning the standard modulation adjustment procedure. If the transmitter's channel frequency changes, the audio processor should be realigned to optimize the transmitter's performance.
  • Page 20 15) Adjust the Microphone Input Level Adjust pot (R1) to achieve 50% of RF signal modulation. Observe that the distortion should be under 5%. 16) Turn off the transmitter. Remove the signal source and replace all the screws. DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 21: Transmitter Interconnect Pin Definitions

    TRANSMITTER INTERCONNECT PIN DEFINITIONS The MT-3 AM series Transmitter employs a 48 pin Eurostandard connector for interfacing to all transmitter power, audio, and control functions. The following are the MT-3 AM series Transmitter backplane connections to the M-3 Motherboard. P i n...
  • Page 22 This Page Intentionally Left Blank DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...
  • Page 23 TITLE: MT-3 TRANSMITTER BLOCK DIAGRAM PTT OUTPUT PTT OUTPUT DATE.: 19 JULY 1994 DWN: SHANE AEBISCHER APRVD: DWG No: DWG REV DATE: MT3TXMNM1C 9 OCTORBER 1998 43-920917 BOARD NO.: BOARD REV.: DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...
  • Page 24 This Page Intentionally Left Blank DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 25: Illustrations And Schematic Diagrams

    MT-3 AM Transmitter Board Electrical Assembly 5.2.1 MT-3 AM Transmitter Board Top Side Component Layout SYNTHESIZER GROUND TAB (Low Power Synthesizer Only) FSW4 BCD-10 OC-3 RF 1ROW X 2PIN OUTPUT FSW3 BCD-10 100nF TP32 OST-3H RF OS-3H ENHANCED SYNTHESIZER TP31...

  • Page 26: Am Transmitter Main Board Component Layout (Bottom)

    5.2.2 MT-3 AM Transmitter Main Board Component Layout (Bottom) x J15 y 1µF x J15 y 27k4 10µF y J25 x y J25 x LPF35 BLUE LPF34 2222 LPF33 x J13 y x J13 y GND: BLACK LPF32 1k00 LPF31 1 µF...
  • Page 27 FSW4 DANIELS ELECTRONICS VICTORIA B.C. AM/FM STANDBY MODES UNUSED REFERENCE DESIGNATORS LPF15 STANDARD/LOW FREQUENCY MODULATION MODE 3 MODE 4 TITLE: MT-3 TRANSMITTER BOARD SCHEMATIC DIAGRAM TX STANDBY MODE 1 MODE 2 C9,C11,C16 J1,J5,J8 J10,J11 Not Installed Installed Installed Installed DESIGN STD MOD VER.

  • Page 28: Front Panel Board

    5 . 3 MT-3 Front Panel Board 5 . 3 . 1 MT-3 Front Panel Board Component Layout Factory Installed Solder Jumper. Solder Jumper On Solder Side Of PCB. 43-921212 MT3TXMNM5A DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 29: Front Panel Board Schematic

    ELECTRONICS VICTORIA B.C . TITLE: MT-3 FRONT PANEL BOARD APRVD: DATE.: DWN: M. GAUBE 07 APRIL 1992 28 MAY 97 DWG No: MT3TXMNM6A DWG REV DATE: BOARD NO.: 43-921212 BOARD REV.: DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 30: Am Audio Processor Electrical Assembly

    MT-3 AM Audio Processor Electrical Assembly 5.4.1 MT-3 AM Audio Processor Component Layout 1N5221B 1N5221B 50k0 100k0 680nF 680nF Microphone Automatic Balanced Modualtion Input Level Modulation Input Level Control Output Adjust Control Input Adjust Adjust Adjust 4.7uF 1.0uF MC33174 wo # xxxx FB 1 4.7uF...
  • Page 31 9.5 Vdc OPTIONAL MT-3 TX TIME-OUT-TIMER HIGHEST REFERENCE DESIGNATORS DANIELS ELECTRONICS VICTORIA B.C. ------ TITLE: MT-3 AM Tx AUDIO BOARD SCHEMATIC DIAGRAM UNUSED REFERENCE DESIGNATORS DATE: MARCH 1998 DWN BY: STAN POLYAKOV. APRVD: C4, C24 R12, R21 DWG No: MT3AMTXM9B...
  • Page 32 9.5V 2.9VDC 15k0 100k DANIELS HIGHEST REFERENCE DESIGNATORS ELECTRONICS VICTORIA B.C. TITLE: MT-3 TX TIME OUT TIMER SCHEMATIC DIAGRAM ----- DATE: 19 JANUARY 1996 DWN BY: MICHAEL GAUBE APRVD: UNUSED REFERENCE DESIGNATORS DWG No: MT3APM4 DWG REV DATE: 16 JANUARY 1996...

  • Page 33: Parts Lists

    TRANSISTOR, BC807-25,PNP,SOT23 2120-BC807025 RES., SM, 10R0 0805, 1% 100ppm 1150-1A10R0FP RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP RES, SM, 1K0 0805, 1% 100ppm 1150-3A1001FP RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...
  • Page 34 TRANSFORMER, AUDIO XFMR AUDIO 600R 1:1 1280-600P6005 IC, MC33172 DUAL_OP_AMP, SO- 2302-33172N08 IC, MC14081 QUAD_2I\P_AND, S 2375-40810N14 IC, MMAD1108 8_DIODE\ARY. SO1 2331-11080N16 IC, MMAD1108 8_DIODE\ARY. SO1 2331-11080N16 IC, LP2951 PROG._VOLT_REG S 2305-29510N08 DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 35: Transmitter Main Board Mechanical Parts List

    2 (Synthesizer only) WIRE, TFE/STRAND., 24AWG, VIOL (13.5 cm) 7121-24S19367 WIRE, TFE/STRAND., 24AWG, ORG (12.5 cm) 7121-24S19363 WIRE, TFE/STRAND., 24AWG, RED (11.0 cm) 7121-24S19362 WIRE, TFE/STRAND., 24AWG, YELLOW (9.5 cm) 7121-24S19364 DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 36: Front Panel Board Electrical Parts List

    HEADER, 0.1", RA, 2 ROW X 2 PIN 5010-H202RA9T SWITCH, TOG/DPDT, ON-OFF-ON, PCB/STR 5215-T2031V02 MT-3 TX FRONT PANEL 4321-40921211 6 . 2 MT-3 AM Audio Processor Parts List 6 . 2 . 1 MT-3 AM Audio Processor Electrical Parts List Design Description Part No.
  • Page 37 RES., SM, 5K11 0805, 1%,100ppm 1150-3A5111FP RES., SM, 47K5 0805, 1%,100ppm 1150-4A4752FP RES., SM, 15K4 0805, 1%,100ppm 1150-4A1542FP RES., SM, 51K1 0805, 1%,100ppm 1150-4A5112FP IC, SA571D COMPANDOR, SO-16L 2327-SA571D00 IC, MC33174 QUAD OP AMP,SO-14 2304-33174N14 DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...
  • Page 38 This page intentionally left blank. DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

  • Page 39: Revision History

    Added land pattern to the PCB for R21. June 98 • Corrected the part number for D1 and D2 on the MT-3 AM Audio Processor Electrical Parts List. December 98 • The Butterworth filter stages were changed to Bessel filters to improve the differetnial group delay of the AM Transmitter.
  • Page 40 This page intentionally left blank. DANIELS ELECTRONICS MT-3 AM Transmitter Main Board Instruction Manual...

This manual is also suitable for:

A21-tx3-00A22-vap130

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