Daniels Electronics Ltd. MT-3, A21-TX3-00, A22-VAP130 Instruction Manual

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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 reproduced, stored in a retrieval system or transmitted in any form o r 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: 2 Issue Date: December 98 Previous Issue Date: March 98 Daniels Electronics Ltd. Printing Date: N/A Victoria, BC Part No.: IM22-MT3AMTXMN PRINTED IN CANADA

Quality Assurance:

Reviewed By:

Larry Freeman Name Signature Date

_________________

NOTE:

The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by 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.

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ELECTRONICS

ii MT-3 AM Transmitter Main Board Instruction Manual

TABLE OF CONTENTS

Page

1 GENERAL...................................................................................... 1-1

1.1 Introduction........................................................................... 1-1

1.2 Performance Specifications ......................................................... 1-1

1.2.1 General....................................................................... 1-1

1.2.2 Audio Specifications........................................................ 1-2

2 THEORY OF OPERATION .................................................................. 2-1

2.1 MT-3 AM Transmitter Main Board ................................................ 2-1

2.1.1 General....................................................................... 2-1

2.1.2 Transmitter Push-To-Talk.................................................. 2-1

2.1.2.1 Microphone PTT................................................... 2-1

2.1.2.2 P TT Wi th Ti me -O ut-Ti mer........................................2-2

2.1.2.3 PTT No Time-Out-Timer.......................................... 2-2

2.1.2.4 Optional Relay...................................................... 2-2

2.1.2.5 PTT Output .........................................................2-3

2.1.2.6 PTT Voltage Switching............................................ 2-3

2.1.2.7 Transmitter Standby Modes....................................... 2-3

2.1.3 Aud io Ci rcui ts............................................................... 2-4

2.1.3.1 Microphone Audio................................................. 2-5

2.1.3.2 Received Audio..................................................... 2-5

2.1.4 Channel Selection...........................................................2-5

2.1.4.1 Synthesized Transmitter........................................... 2-5

2.1.4.2 Crystal Controlled Transmitter ...................................2-5

2.1.5 Amplifier Circuits........................................................... 2-6

2.2 MT-3 Front Panel Board ............................................................ 2-6

2.3 MT-3 AM Audio Processor......................................................... 2-6

2.3.1 General....................................................................... 2-6

2.3.2 Power Requirements........................................................ 2-6

2.3.3 Audio Circuitry.............................................................. 2-7

2.3.4 PTT Time-Out-Timer ....................................................... 2-8

3 TRANSMITTER ALIGNMENT............................................................. 3-1

3.1 General ................................................................................ 3-1

3.2 Repair Note ........................................................................... 3-1

3.3 Printed Circuitboard Numbering Convention..................................... 3-1

3.4 Recommended Test Equipment List ............................................... 3-1

3.5 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

3.6 MT-3 AM Transmitter Board Alignment .......................................... 3-3

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MT-3 AM Transmitter Main Board Instruction Manual iii

3.6.1 General....................................................................... 3-3

3.6.2 MT- 3 AM T ransmi tter Board T est P oints................................ 3-4

3.7 Module Installation and Removal.................................................. 3-4

3.8 MT-3 AM Audio Processor Alignment ........................................... 3-5

3.8.1 General....................................................................... 3-5

3.8.2 MT-3 AM Audio Processor Adjustment ................................ 3-5

4 TRANSMITT ER INTERCONNECT PIN DEF INITIONS.............................. 4-1

5 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS................................... 5-1

5.1 MT-3 AM Transmitter Block Diagram ............................................ 5-1

5.2 MT-3 AM Transmitter Board Electrical Assembly............................... 5-3

5.2.1 MT- 3 A M Tra nsmitter Main Board Component Layout (Top)........ 5-3

5.2.2 MT- 3 A M Tra nsmitter Main Board Component Layout (Bottom)... 5-4

5.2.3 MT-3 AM Transmitter Main Board Schematic Diagram ............... 5-5

5.3 MT-3 Front Panel Board............................................................ 5-6

5.3.1 MT-3 Front Panel Board Component Layout........................... 5-6

5.3.2 MT-3 Front Panel Board Schematic...................................... 5-7

5.4 MT-3 AM Audio Processor Electrical Assembly ................................ 5-8

5.4.1 MT-3 AM Audio Processor Component Layout........................ 5-8

5.4.2 MT-3 AM Audio Processor Schematic Diagram........................ 5-9

6 PARTS LISTS................................................................................. 6-1

6.1 Transmitter Main Board Parts List................................................. 6-1

6.1.1 Transmitter Main Board Electrical Parts List............................ 6-1

6.1.2 Transmitter Main Board Mechanical Parts List.......................... 6-3

6.1.3 MT-3 Front Panel Board Electrical Parts List........................... 6-4

6.2 MT-3 AM Audio Processor Parts List ............................................ 6-4

6.2.1 MT-3 AM Audio Processor Electrical Parts List........................ 6-4

7 REVISION HISTORY........................................................................ 7-1

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iv MT-3 AM Transmitter Main Board Instruction Manual

1 GENERAL

1.1 Introduction

The MT-3 AM Transmitter Main Board integrates the MT-3 Front Panel Board, MT-3 AM Audio Processor, Synthesizer or Crystal Control module and Amplifier module together to make a working MT-3 AM series transmitter (see section 5.1: MT-3 AM Transmitter Block Diagram). The Front Panel Board and the Audio Processor are soldered directly to the Transmitter Main Board while the Amplifier and the Synthesizer or Crystal Control module are frequency band sensitive, plug-in modules. 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. The front and rear back plates are attached to the Transmitter Main Board and together with the extruded aluminum shell, as discussed in the assembly section of the Transmitter Manual, form the transmitter enclosure.

1.2 Performance Specifications

1.2.1 General

Type: MT-3 AM Series Transmitter Compatibility: VT-3A Series Amplifier, OCT-3 Crystal Oscillator, OST-3

Frequency Synthesizer. Modulation: 6K00A3 (Amplitude Modulation) Operating Temperature Range: -30˚C to +60˚C, optional - 40˚C temperature test. Operating Humidity: 95% RH (non-condensing) at +25°C. Operating Voltage: +13.8Vdc , +9.5 Vdc Regulated. Front Panel Control: One 3 position switch

• NORM (repeat mode)

• OFF

• KEY TX

PTT Act iv a ti o n : • Active to ground with or without time-out-timer;

• Microphone activated with or without time-out-timer;

• Front Panel switch: KEY TX - without time-out-timer;

• NORM - with or without time-out-timer.

• Isolated (optional relay) with or without time-out-timer.

PTT Time-Out-Timer: Selectable from 1 sec. to 8 hrs. (factory set 5 min.).

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MT-3 AM Transmitter Main Board Instruction Manual 1-1

1.2.2 Audio Specifications

Audio Input: -30 to 0 dBm into a 600Ω balanced load.

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

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1-2 MT-3 AM Transmitter Main Board Instruction Manual

2 THEORY OF OPERATION

2 . 1 MT-3 AM Transmitter Main Board

2.1.1 General

Switch SW1 on the Front Panel Board is a DPDT switch which controls the operation of the transmitter as discussed in the operations section of the Transmitter Ma nual. When SW1 is in the 'OFF' position the transmitter is turned off; however, +13.8 Vdc is still present on the Transmitter Main Board as the +13.8 Vdc supply is not switched. When SW1 is in the 'KEYED' position, +9.5 Vdc is supplied to the transmitter circuitry and the transmitter is continuously turned on. When SW1 is in the 'NORM' position, +9.5 Vdc is supplied to the transmitter circuitry and the transmitter can be keyed from several Push-To-Talk inputs.

Refer to section 5.2.3 Transmitter Main Board Schematic Diagram".

2.1.2 Transmitter Push-To-Talk

All three o f the Push-To-Talk (PTT) inputs that key the transmitter are active low (< +2.0 Vdc). One PTT input is on the front panel microphone connector. The other two PTT inputs: PTT WTO (PTT With Time-Out-Timer) and PTT NTO (PTT No Time-Out-Timer), are on the backplane connector of the transmitter board. If required, the microphone's PTT input can be configured to activate the transmitter's Time-Out-Timer (TOT). An isolated PTT input can be made available by installing an optional relay (RELAY1) and configuring jumpers J2 to J4 so that the relay con trols the PTT circuitry.

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 byp ass or activate the tr ansm itter's TOT. Soldering jumper J1 in the 'x' position (default) selects the MIC PTT NTO line which bypasses the TOT. Soldering J1 to the 'y' position selects the MIC PTT WTO line which activates the trans mitter's TOT. When SW1 is in the 'KEYED' position the MIC PTT NTO line is automatically grounded. Refer to Section 5.3.1, "MT-3 Front Panel Board Component Layout" for the location of jumper J1.

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MT-3 AM Transmitter Main Board Instruction Manual 2-1

2.1.2.2 PTT With Time-Out-Timer

Pins B10 and Z10 of the backplane connector are the PTT WTO input. When the PTT WTO signal, which is normally high, falls below +2.0 Vdc, the transmitter is keyed. The transmitter is disabled when the PTT WTO input rises above +2.3 Vdc or if the TOT's time-out period is exceeded. If the time-out period is exceeded the PTT WTO input must go high (>+2.3 Vdc) an d then low again in order to rekey the transmitter.

The PTT WTO threshold of approximately +2 Vdc (0.3 Vdc hysteresis) i s set by U1a, R1, R2, R3, R4 , R9, and R 10 while diodes D 1 and D2 provide overvoltage protection for U1a. The PTT WTO signal output from U1a is 'AND'ed with the MIC PTT WTO by U2a. When either the PTT 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 out put 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.

2.1.2.3 PTT No Time-Out-Timer

Pins B14 and Z14 of the backplane connector are the PTT NTO input. When the PTT NTO signal, which is normally high, falls below +2.0 Vdc, the transmitter is keyed. As long as the PTT NTO signal remains below +2.0 Vdc the transmitter will remain keyed. The transmitter is disabled when the PTT NTO signal rises above +2.3 Vdc.

The PTT NTO threshold of approximately +2 Vdc (0.3 Vdc hysteresis) is set by U1b, R5, R6, R7, R8, R9, and R10 while diodes D3 and D4 provide overvoltage protection for U1b. The PTT NTO signal is 'AND'ed with the o utput of U2c (MIC PTT NTO signal 'AND'ed with the TOT output) by U2d. When the output of U2d goes low the transmitter is activated by transistors Q1 to Q7 which switch power to the various modules.

2.1.2.4 Optional Relay

The transmitter's PTT circuitry can be completely isolated by installing RELAY1. Jumpers J2 to J4 configure the relay to provide an isolated PTT input for either the PTT WTO l ine o r PTT NTO line. The isolated PTT input is enabled by energizing the relay. The transmitter board will accept any of the Aromat TF2E line relay s. These relays are DPDT, single side stable, and have coil voltages ranging from +3 Vdc to +48 Vdc. Only one set of relay contacts are used to activate the PTT circuitry, the other set of contacts are brought out to the backplane connector. To configure the isolated input for PTT WTO operation jumpers J2, J4 must be in the 'y'position, J3 must be in the 'x' position. In this mode, pins B10 and Z10 n o longer function as the PTT WTO input; however, pins B14 and Z14 continue to function as the normal PTT NTO input.

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2-2 MT-3 AM Transmitter Main Board Instruction Manual

To configure the isolated input for PTT NTO operation jumpers J2, J4, must be in the 'x' position J3 must be in the 'y' position. In this mode, pins B14 and Z14 no longer function as the PTT NTO input; however, pins B10 and Z10 continue to function as the normal PTT WTO input.

2.1.2.5 PTT Output

Pin B24 on the backplane connector is an open drain output (Q9) which is pulled low anytime the transmitter is keyed and the synthesizer is locked. A crystal controlled transmitter does not have a locked condition so pin B24 is pulled low anytime the transmitter is keyed. Q9, an N-channel MOSFET capable of sinking currents up to 2 Amps, is activated by Q8 which is activated by the Qualified PTT signal (JS2-6) of the synthesizer or crystal control module. The Qualified PTT signal also controls the LED ENA line for diode D1 on the front panel board and enable line for the VT-3A Amplifier Module (JP1-1).

2.1.2.6 PTT Voltage Switching

The PTT voltage switching circuitry is comprised of transistors Q1 through Q7 and the associated resistors. The base of Q1 is driven by the output of U2d which is the combined PTT signal from all of the PTT inputs. When the transmitter is keyed, Q1 is turned off and subsequently transistors Q3, Q4, and Q6 are turned on. Transistors Q3, Q4, and Q6 provide three different functions:

•Q3 provides the active low signal for the synthesizer or crystal 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 activated by installing jumper J6 or by externally grounding the TX Standby Line (pins B12 and Z12). The '+9.5 Vdc PTT Switched' supply and the '+9.5 Vdc Switched' supply both provide +9.5 Vdc but depending on how jumpers J6, J7 and J18 are configured the transmitter's standby mode will change.

2.1.2.7 Transmitter Standby Modes

The VT-3A130 Transmitter has four different standby modes that trade-off standby current consumption for start-up speed. The standby modes are determined by three jumpers: jumper J 6 which always turns on the '+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 OST3A128 Synthesizer or OCT-3 Crystal Control Module.

The actual current and start-up time may depend on the frequncy controlled source (crystal or synthesizer) and amplifier module. The current and start-up times given below are representative values intended only as a guideline.

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MT-3 AM Transmitter Main Board Instruction Manual 2-3

•MODE 1: Jumper J6 out

- the audio processor is switched by a PTT signal

- the synthesizer or crystal module is switched by a PTT signal

- standby current: Synthesized - typically 13 mA Crystal Controlled - typically 6 mA

- start-up time: Synthesized - typically 40 ms Crystal Controlled - typically 40 ms

•MODE 2: Jumper J6 in, jumper J7 in the 'y' position, jumper J18 in the 'x' position

- the audio processor is switched by a PTT signal

- the synthesizer or crystal module is enabled all of the time

- standby current: Synthesized - not used in this mode Crystal Controlled - typically 6 mA

- start-u p t i m e : Synthesized - not used in this mode

Crystal Controlled - typically 40 ms

• MODE 3: Jumper J6 in, jumper J7 in the 'x' position, jumper J18 in the 'y' position

- the audio processor is enabled all of the time

- the synthesizer or crystal module is switched by a PTT signal

- standby current: Synthesized - typically 19 mA Crystal Controlled - typically 11 mA

- start-up time: Synthesized - typically 40 ms Crystal Controlled - typically 8 ms

•MODE 4: Jumper J6 in, jumper J7 in the 'x' position, jumper J18 in the 'x' position

- the audio processor is enabled all of the time

- the synthesizer or crystal module is enabled all of the time

- standby current: Synthesized - typically 163 mA Crystal Controlled - typically 23 mA

- start-up time: Synthesized - typically 12 ms Crystal Controlled - typically 8 ms

2.1.3 Audio Circuits

All of the audio signal conditioning (e.g. limiting, filtering) is performed b y the MT-3 AM Audio Processor. The transmitter board routes the audio lines from the backplane connector to the audio processor. 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. The audio pro cess or' s balanced input pins are isolated from pins B18 and Z18 by a transformer (T1). Two audio outputs from the MT-3 AM Audio Processor are routed to the VT-3A130 Amplifier.

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2-4 MT-3 AM Transmitter Main Board Instruction Manual

2.1.3.1 Microphone Audio

Normally the audio from a transmitter's microphone is transmitted by that transmitter; however, the 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. Jumper J16 selects the audio source for the MT-3 AM Audio Processor's microphone input. Jumper J17 is used to enable or disable the MIC OUT line. Normally the transmitter's microphone is selected (J16 in the 'x' position) and the MIC OUT line is enabled (J17 is installed).

2.1.3.2 Received Audio

Pin B20 is the audio input from the tra nsmi tter's corresponding receiver. The default setting for this line is to have it AC coupled (Jumper J9 is out) and directly connected to the front panel board RX AUDIO line.

2.1.4 Channel Selection

2.1.4.1 Synthesized Transmitter

Eight backplane connections are used to communicate with the synthesizer unit. Pins D28, D30, and D32 are used (in house) to program the synthesizer. Channel select lines (pins D20, D22, D24, and D26) are used once the synthesizer is programmed to select one of 16 channels. If the channel select lines are all low (channel 0) the channel for the synthesizer is read from switches FSW1 (most significant), FSW2, FSW3, and FSW4 (least significant). Since the resulting frequency is dependent on the transmitter model, refer to the section on frequency selection in the Transmitter Manual or to the channel designation tables for that particular transmitter.

2.1.4.2 Crystal Controlled Transmitter

The crystal control module is a direct replacement for the synthesizer module and therefore uses the same connections as the synthesizer to connects to the MT-3 AM Transmitter Main Board. The channel select lines and switches FSW1 to FSW4 are not used by the crystal control module as the transmitter's operating frequency is determined by the crystal control module's crystal frequency. A frequency multiplication factor, described in the manual for this module, relates the crystal frequency to the operating frequency .

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MT-3 AM Transmitter Main Board Instruction Manual 2-5

2.1.5 Amplifier Circuits

The MT-3A series Amplifier has 5 connections that are cabled to the transmitter board: +13.8 Vdc, +9.5 Vdc, Enable, Mod and Gnd. The +13.8 Vdc supply (JP1-3) is always on while the +9.5 Vdc supply (JP1-2) is always switched by a PTT signal. The enable line (JP1-1) is active low and is controlled by the Qualified PTT signal from the synthesizer.

Jumpers J12, J13, J14, and J15 are not installed.

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. Jumper J1, located on the rear of the circuitboard, is used to select whether or not the MIC PTT line activates the transmitter's TOT:

•Jumper J1: 'x' position MIC PTT NTO no time-out-timer (factory setting) 'y' position MIC PTT WTO with time-out-timer

Refer to section 5.3.2 "MT-3 Front Panel Board Schematic Diagram".

2.3 MT-3 AM Audio Processor

2.3.1 General

The MT-3 AM Audio Processor is a versatile circuitboard that can provide several types of audio processing. The module also has an on-board programmable push-to-talk (PTT) time-out-timer (TOT) on an attached circuitboard. A continuous +9.5 Vdc supply and a continuous +13.8 Vdc supply together with a switched +8.0 Vdc supply are required to power the module. Refer to section 5.4.1 "MT-3 AM Audio Processor Component Layout" and to section 5.4.2 "MT-3 AM Audio Processor Schematic Diagram" for component location and designation references.

2.3.2 Power Requirements

The audio processor can be configured for continuous audio standby or for switched audio standby by the Transmitter Main Board. If fast audio risetime is desired, the transmitter should be operated in standby mode 3 or 4 as specified in section 2.1.2.7. The current for the associated TOT is approximately 4 mA when the transmitter is keyed.

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2-6 MT-3 AM Transmitter Main Board Instruction Manual

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 . U1b controls the input level and makes gain inversely proportional to the input level (say a 20 dB drop in input level will produced a 20 dB increase in gain). The output will remain fixed at a constant level without clipping and distortion. (Automatic Level Control) The input signals are adjusted by the pots R1, R16. The variable gain cell in U1a is used as a voltage-controlled amplifier so that if the power supply (13.8Vdc) has changed the output level will change in order to keep the modulation of the RF output signal at the same level. The gain control can be adjust by the pot R4. (Automatic Modulation Control) The audio signal then amplifies and filters at U2 . The output signal is adjusted by the pot R9.

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MT-3 AM Transmitter Main Board Instruction Manual 2-7

2.3.4 PTT Time-Out-Timer

The PTT time-out-timer (TOT) is a relatively independent circuitry located on the Transmitter Board. The TOT is powered from the continuous +9.5 Vdc supply (J34) and is programmable for various time-out periods. The TOT input i s normally high and in this state the timer is disabled. When the input trigger level falls below +2.0 Vdc, the timer is activated, and the transmitter is keyed. If the input trigger rises above +2.4 Vdc or if the time-out period is exceeded, the output trigger will go high, disabling the transmitter. If the time-out period is exceeded, the TOT input trigger must go high and then low again in order to rekey the transmitter.

The time-out duration is jumper selectable from 1 second to 8 hours. The table below shows the time-out duration in minutes for the various jumper settings which are listed as enabled (E: jumper shorted - in) or disabled (D: jumper left open - o ut). The standard factory setting of 5 minutes is shown in bold type in the table below. D = DISABLED (no solder jumper installed), E = ENABLED (solder jumper installed). Bold text represents default settings.

TIME-OUT DURATION

(MINUTES)

JU26= E JU26= D JU26= E

JU32 JU31 JU29 JU28 JU27= D JU27= E JU27= E

E E E E 0.01 0.01 0.01 E E E D 0.02 0.03 0.01 E E D E 0.04 0.06 0.02 E E D D 0.08 0.12 0.05 E D E E 0.15 0.23 0.10 E D E D 0.31 0.47 0.19 E D D E 0.62 0.94 0.38 E D D D 1.25 1.88 0.75 D E E E 2.5 3.75 1.5

DEED 5.0 7.5 3.0

DEDE 10 15 6.0 D E D D 20 30 12 DDEE406024 D D E D 80 120 48 D D D E 160 240 96 D D D D 320 480 192

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2-8 MT-3 AM Transmitter Main Board Instruction Manual

3 TRANSMITTER ALIGNMENT

3.1 General

Transmitter alignment is simplified by using an M-3 Subrack, SM-3 System Monitor, and RF extender cable to provide transmitter power and signal interconnection. Alternatively, +9.5 Vdc and +13.8 Vdc may be applied directly to a transmitter module through positive connection for the +9.5 Vdc to pins B6 and Z6, for the +13.8 Vdc to pins B2 and Z2, and negative connection to pins 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.

3.3 Printed Circuitboard Numbering Convention

To ease troubleshooting and maintenance procedures, Daniels Electronics Limited has adopted a printed circuitboard (PCB) numbering convention in which the last two digits of the circuitboard number represent the circuitboard version. For example:

• PCB number 43-9120 10 indicates circuitboard version 1.0;

• PCB number 50002- 02 indicates circuitboard version 2.0.

All PCB's manufactured by Daniels Electronics are identified by one of the above conventions.

When removing Surface Mount Solder Jumpers, it is recommended to use solder braid in place of manual vacuum type desoldering tools when removing jumpers. This will help prevent damage to the circuitboards.

3.4 Recommended Test Equipment List

Alignment of the complete transmitter requires the following test equipment or its equivalent. It is assumed that any adjustment of the Transmitter Main Board will also involve the other modules.

Dual Power Supply: Regulated +9.5 Vdc at 2 A.

Regulated +13.8 Vdc at 2 A - Topward TPS-4000 Oscilloscope / Multimeter: Fluke 97 Scopemeter Current Meter: Fluke 75 Multimeter

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MT-3 AM Transmitter Main Board Instruction Manual 3-1

Radio communications test set : Marconi Instruments 2955R VSWR 3:1 mismatch load: JFW 50T-035-3.0:1 Alignment Tool: Johanson 4192

It is recommended that the radio communications test set be frequency locked to an external reference (WWVH, GPS, Loran C) s o that the high stability oscillator may be accurately set to within its ±1 ppm frequency tolerance.

3.5 Standard Factory Settings and Jumper Configuration

Standard factory settings and the associated jumper configuration for each module of the 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: 'x' position Opti onal rela y configuration

•Jumper J3: not installed Optional relay configuration

•Jumper J4: 'y' position Opti onal rela y configuration

•Jumper J6: installed Transmitter standby mode select - Mode 3

•Jumper J7: 'x' position Audio processor standby mode select

•Jumper J9: not installed Receiver audio ac/dc input coupling

•Jumper J12: not installed Not applicable

•Jumper J13: not installed Not applicable

•Jumper J14: not installed Not applicable

•Jumper J15: not installed Not applicable

•Jumper J16: 'x' position Microphone configuration

•Jumper J17: installed Microphone output line

•Jumper J18: 'y' position Synthesizer or crystal module standby mode select

•Jumper J19: 'x' position 600Ω audio transformer bypass

•Jumper J20: 'x' position 600Ω audio transformer bypass

•Jumper J21: not installed +8 Vdc audio processor supply bypass

•Jumper J22: 'x' position 600Ω audio transformer bypass

•Jumper J23: 'x' position 600Ω audio transformer bypass

•Jumper J24: not installed Not applicable

•Jumper J25: 'y' position AM Modulation mode

•Jumper J26: installed TOT configuration

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3-2 MT-3 AM Transmitter Main Board Instruction Manual

•Jumper J27: not i ns t a ll e d TOT configuration

•Jumper J28: not i ns t a ll e d TOT configuration

•Jumper J29: installed TOT configuration

•Jumper J31: installed TOT configuration

•Jumper J32: not i ns t a ll e d TOT configuration

•Jumper J33: installed TOT input

•Jumper J34: installed TOT power supply

•Jumper J35: installed TOT output

3.5.2 MT-3 AM Audio Processor Factory Configuration

The MT-3 AM Tx Audio Processor is factory configured as follows:

•Microphone Input: 1kHz tone at -10 dBm gives 50% maximum modulations.

•Audio Balanced Input: 1 kHz tone at -8 dBm gives 90% maximum modulations.

•Automatic Modulation Control enabled

•Automatic Level Control enabled

The corresponding jumper settings are:

•Jumper JU1: 'y' position Automatic Modulation Control enabled

•Jumper JU2: not installed Modulation configuration

•Jumper JU3: 'y' position Automatic Level Control enabled

•Jumper JU4: not installed Time-out-time power supply (optional)

•Jumper JU5: 'y' position Voice application

•Jumper JU6: 'y' position Voice application

•Jumper JU7: not installed Modulation configuration

•Jumper JU8: 'y' position Automatic Level Control enabled

•Jumper JU9: installed Power AMC and Microphone enabled

3 . 6 MT-3 AM Transmitter Board Alignment

3.6.1 General

Before proceeding with the transmitter alignment, check that the appropriate jumpers are installed. The standard jumper configuration for the Transmitter Main Board, given in section 3.4.1, is normally employed for transmitter alignment. 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. The switch settings for the desired channel frequency can be found in the channel designation tables. If the transmitter is using a crystal control module, the switch settings are irrelevant.

DANIELS

ELECTRONICS

MT-3 AM Transmitter Main Board Instruction Manual 3-3

3.6.2 MT-3 AM Transmitter Board Test Points

TP1: not used TP2: microphone audio TP3: microphone PTT WTO; inactive +9.5 Vdc, active 0 Vdc TP4: microphone PTT NTO; inactive +9.5 Vdc, active 0 Vdc TP5: +9.5 Vdc from backplane connector TP6: +9.5 Vdc from front panel board TP7: +9.5 Vdc Switched TP8: Qualified PTT; inactive +9.5 Vdc, active 0 Vdc: activated by synthesizer TP9: synthesizer enable; selected by J18 TP10: synthesizer bootstrap line; +5 Vdc TP11: synthesizer PTT input; inactive +9.5 Vdc, active 0 Vdc TP12: audio processor TOT input; inactive +9.5 Vdc, active 0 Vdc TP13: audio processor TOT output; inactive +9.5 Vdc, active 0 Vdc TP14: audio processor audio output TP15: not used TP16: not used TP17: not used TP18: not used TP19: audio processor continuous +9.5 Vdc TP20: not used TP21: audio processor supply +8 Vdc, selected by J7 TP22: not used TP23: synthesizer receive data line; 0 Vdc TP24: synthesizer transmit data line; +5 Vdc TP25: Q1 collector; inactive 0 Vdc, active +9.5 Vdc TP26: U2d output; inactive +9.5 Vdc, active 0 Vdc TP27: U1a output (PTT WTO); inactive +9.5 Vdc, active 0 Vdc TP28: U1b output (PTT NTO); inactive +9.5 Vdc, active 0 Vdc TP29: Q6 collector / Q7 gate; inactive +9.5 Vdc, active 0 Vdc TP31: +9.5 Vdc TOT SET TP32: +9.5 Vdc TOT RESET TP33: +9.5 Vdc BALANCED INPUT TP34: +9.5 Vdc BALANCED INPUT

3.7 Module Installation and Removal

Installation of the Enhanced Synthesizer or Crystal Controlled Oscillator module is facilitated by alignment pins on each corner of the module. When the four pins are aligned with their corresponding hole in the 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

3-4 MT-3 AM Transmitter Main Board Instruction Manual

To remove the Enhanced Synthesizer o r Crystal Controlled Oscillator module, simply remove the center screw from the module lid and pull the module out. The module should be pulled straight out so that the four alignment pins do not bend or damage the circuitboard.

3.8 MT-3 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 perfo rmance . The schematic diagram for the audio processor is shown in section 5.4.2 and the component layout is shown in section 5.4.1.

3.8.2 MT-3 AM Audio Processor Adjustment

**note: clockwise rotation of controls increase signal levels

1) Before adjusting the audio board, confirm that the transmitter frequency is correct.

2) Unscrew and slide out the case of the transmitter. Locate the Tx Audio Board.

3) Connect the transmitter RF Output to a Radio communications test set.

4) Con nect the 600 ohm input to the incoming audio (pins B18, Z18). Set the audio frequency to 1 kHz at the desired level of -8 dBm.

5) Turn the transmitter on.

6) Adjust the pot R16, in order to achieve about 0.700 Vrms at TP4.

7) Adjust the pot R14, in order to achieve about 0.200 Vrms at TP8.

8) Tune the Audio Adjust pot R1 on the Power Amplifier board to obtain 90% modulation.

9) Apply a 1 kHz, -20 dBm input signal and adjust the pot R16 in order to obtain 30 % modulation.

10) Apply a 1 kHz, -8 dBm input signal, the modulation should be 90%, observe that the distortion of the transmitted signal is within 5.0%.

DANIELS

ELECTRONICS

MT-3 AM Transmitter Main Board Instruction Manual 3-5

11) Slowly increase the input audio signal level to 5 dBm and observe that the modulation does not go over 100%. This step verifies the correct operation of the ALC .

12) Change 13.8Vdc power supply to 10V and then to 17V, the modulation of the output RF signal should remain at the same level of 90% ±7% and distortion should be less then 3%. If not, adjust the pot R4 on the Audio Processor Board to achieve this. This step verifies the correct operation of the AMC.

13) Repeat steps 7 and 9 if required.

14 Supply a 1 kHz, -10 dBm signal to the microphone input. (Note the level restriction

of -25 dBm to 0 dBm.)

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

3-6 MT-3 AM Transmitter Main Board Instruction Manual

4 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.

Pi n Name P i n Name Pi n Name

D2 N/C B2 +13.8 Vdc Z2 +13.8 Vdc D4 N/ C B4 MIC Out Z4 MIC In D6 N/C B6 +9.5 Vdc Z6 +9.5 Vdc D8 N/C B8 Relay Positive Z8 Relay Negative D10 N/C B10 PTT WTO Z10 PTT WTO D12 N/C B1 2 Tx Standby Z12 Tx Standby D14 N/C B14 PTT NTO Z14 PTT NTO D16 N/C B16 No Connect (MT-2 +9.5V) Z16 No Connect (MT-2 +9.5V) D18 N/C B18 Balanced Input 2 Z18 Balanced Input 1 D20 Channel Select 0 (LSB) B20 Squelched,De-emph Audio Z20 Squelched, Flat Audio D22 Channel Select 1 B22 Subtone Input 1 Z22 Tx Audio Control D24 Channel Select 2 B24 PTT Output Z24 Subtone Input 2 D26 Channel Select 3 (MSB) B26 Forward Power Sense Z26 Reverse Power Sense D28 Synth Tx Data (Output) B28 Monitor Out Z28 Direct Mod Input D30 Synth Rx Data (Input) B30 Ground Z30 Ground D32 Synth Bootstrap (Input) B32 Ground Z32 Ground

DANIELS

ELECTRONICS

MT-3 AM Transmitter Main Board Instruction Manual 4-1

This Page Intentionally Left Blank

DANIELS

ELECTRONICS

4-2 MT-3 AM Transmitter Main Board Instruction Manual

LED ENA

B20

J16

RELAY1

U2d

U2c

D32

D20

+9.5VDC

+9.5 VDC

U2a

J17

JP1-2

+9.5 VDC

Z20

B22

Z18

B18

Z24

Z28

B12 Z12

B10 Z10

B14 Z14

B24

D12

D10

D30

D28

D22

D24

D26

Z22

B26

Z26

Z30

B32

Z32

B30

+9.5V

+9.5V OUTPUT

GROUND

MIC PTT WTO

MIC PTT NTO

MIC AUDIO

MT-3 FRONT PANEL BOARD

RX AUDIO / +13.8V

+13.8VDC

RFOU T

REFEREN CE

INPUT

OC-3 CRYSTAL CONTROL MODULE

OS-3 SYNTHESIZER MODULE

FRONTPANEL NC ONNECTO

RF IN

RF OUT

+9.5V

+13.8V

FOR REV

ENA

MT-3 VHF/UHF AMPLIFIER MODULE

LED ENA

+9.5VDC

PTT TRIGGER

PTT WTO TRIGGER

+9.5VDC

SWITCHING CIRCUITRY

+9.5VDC

VSWR REVERSE

FORWARD POWER FAIL INDICATOR

10-17 VOLTS + 13.8 VDC NOMINAL

BACKPLANE CONNECTOR

GROUND

RX DATA IN

TX DATA OUT

BOOTSTRAP

CHANNEL SEL 0 (LSB)

CHANNEL SEL 1

CHANNEL SEL 2

CHANNEL SEL 3 (MSB)

TX AUDIO CONTROL

+9.5 VDC PTT SWITCHED

J12

R25 27K4

R26 1K0

Q10 PZT2222A

J14

J15J13

FUSE (OPTIONAL)

+9.5 VDC CONTINUOUS

SQL DE-EMP INPUT

MIC OUT

MIC IN

BALANCED INPUT SIDE 2

600 OHMS

BALANCED INPUT SIDE 1

SUBTONE INPUT #1

SUBTONE INPUT #2

SQL FLAT INPUT

DIRECT MOD INPUT

PTT WTO

TX STANDBY

NO2

COMMON 2

NC2

RLY POS

RLY NEG

NC 2

NC 1

COMMON 1

PTT NTO

PTT OUTPUT

TX STANDBY

PTT

+ 9.5 VDC PTT SWITCHED

+ 9.5 VDC SWITCHED

+ 9.5 VDC PTT SWITCHED

+ 9.5 VDC SWITCHED

17 9 8

10 4 2 3

456 7 8

MSB

LSB

600Ω

PTT

J18

+ 9.5 VDC PTT SWITCHED

+ 9.5 VDC SWITCHED

PTT OUTPUT

8 VDC

SUPPLY

+9.5 VDC

J20

J22

J23

J19

AUDIO OUTPUT

SUBTONE #2 OUTPUT

MICROPHONE INPUT

BALANCED INPUT

+9.5V

+8.0V SWITCHED

TONE/DIGITAL INPUT

SUBTONE #1 INPUT

SUBTONE #2 INPUT

DIRECT MODULATION INPUT

GND

MT-3 AUDIO PROCESSOR

AUDIO CONTROL

AM(N/C)

TOT INPUT

TOT OUTPUT

J35

J33

TOT INPUT

TOT OUTPUT

TIME OUT

TIMER

J25

JP1-7

J25 PIN 3

DANIELS

ELECTRONICS

VICTORIA B.C .

DATE.: DWN: DWG No:

TITLE:

APRVD:

BOARD NO.: BOARD REV.:

DWG REV DATE:

DANIELS

ELECTRONICS

MT3TXMNM1C

5 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS

5.1 Transmitter Block Diagram

5-1MT-3 AM Transmitter Main Board Instruction Manual

MT-3 TRANSMITTER BLOCK DIAGRAM

SHANE AEBISCHER

43-920917

1.7

19 JULY 1994

9 OCTORBER 1998

This Page Intentionally Left Blank

DANIELS

ELECTRONICS

5-2 MT-3 AM Transmitter Main Board Instruction Manual

VICTORIA B.C .

DATE: May 9, 1997

DANIELS

ELECTRONICS

BOARD No.: 43-920917 DWG REV DATE:

43-920917

DWG No: 9209AS3A

TITLE: MT-3 Component Side SM Layout

Factory installed jumpers

20 19 18 17 16 15 14 13

SPT-196

JS3

JS2

JS1

6 5 4 3 2 1

MT-3 FRONT PANEL BOARD

12 11 10

9 8 7 6 5 4 3 2 1

1R0W X 12PIN

1ROW X 9PIN

1ROW X 6PIN

1ROW X 2PIN

RELAY1

OPTIONAL

MT-3 AUDIO PROCESSOR BOARD

3412341

341

JA1JA2

JA3 JA4

JA5

JF1JF2

ENA

+9.5V

13.8V

FOR

REV

GND

DWG No: TX3AT9D

TITLE: MT-3 Transmitter Component Side T/H Designations

DWG REV DATE:

JF3

AUDIO IN

C23

100nF

R42 OPT

FSW4 BCD-10

FSW3 BCD-10

FSW2 BCD-10

FSW1 BCD-10

MSD

LSD

- Components Not Installed

12B

SYNTHESIZER GROUND TAB (Low Power Synthesizer Only)

OS-3 RF

OUTPUT

OC-3 RF OUTPUT

OS-3H ENHANCED SYNTHESIZER

OC-3 CRYSTAL CONTROL MODULE

OST-3H RF

OUTPUT

TP19 TP20

TP22TP21

DBZ

TP15

TP16 TP18TP17

TP12

TP13

TP14

TP1

TP2

TP3

TP4

TP5

TP6

TP8

TP9

TP10 TP11

TP7

TP25

TP26

TP27

TP28

TP29

TP30

TP24

TP23

TP33 TP34

TP31

TP32

DANIELS ELECTRONICS

5-5Illustrations and Schematic Diagrams

MT3TXMNM2B

Factory installed jumpers

5.2 MT-3 AM Transmitter Board Electrical Assembly

5.2.1 MT-3 AM Transmitter Board Top Side Component Layout

DANIELS ELECTRONICS

5-3MT-3 AM Transmitter Main Board Instruction Manual

VICTORIA B.C .

DATE.: 9 May 1997

DANIELS

ELECTRONICS

BOARD No.: 43-920917

43-920917

TITLE: MT-3 Transmitter Solder Side SM Layout

DWG No: 9209AS3B

DWG REV DATE: 10 Aug. 1998

Factory installed jumpers Components Not Installed

TITLE: MT-3 Transmitter Solder Side SM Designations

DWG No: 9209AS2D

J18

BYD17J

R2 27k4

D2 BYD17J

R9 221k

R10

100k

1k00

D1 BYD 17J

D3 BYD 17J

R6 27k4

1k00

27k4

10nF

C5 100nF

33172

10nF C7

100nF C8

27k4 R15

10k0

R18

10k0

4081

R14

10k0

BC817

R12 27k4

R13 27k4

R11

27k4

D6 BYD17J

C3 16V 10µF

C4 1µF 16V

D15N

06V

BC807

R24 68k1

R22 68k1

R23 10k0

R21 10K0

R19

10k0

BC817

R20

68k1

BYD

17J

D5P06V

MMAD1108

10µF

35V

R26 1k00

Q10 PZT

2222

R25 27k4

C2 1µF 35V

Q6 BC817

J17

J12

R17 1k00

C12

10nF

C13 10nF

LPF35 LPF34 LPF33 LPF32 LPF31 LPF30 LPF29 LPF28 LPF27 LPF26 LPF25 LPF24 LPF23 LPF22 LPF21 LPF20 LPF19 LPF18 LPF17 LPF16 LPF15

LPF12

LPF10

LPF8

LPF3 LPF5 LPF4 LPF2 LPF1

BAS

x y

J21

U6 LP

2951

y J7 x

J14

R29 82k5

x J13 y

10R0

J16

R110R0

R30 15k0

C15

4.7µF

C14

10nF

D7 BAS 16

M2.5 PRESS NUT

LPF14

C10 1 µF

y J25 x

R16

10k0

xyx

J20 J23

J19 J22

J24

x J15 y

C20

4.7µF 16V

MC14536B

R39

221K

33172

R32

1k00

R34

27k4

R33

68k1

R31

221k

R38

100k

R37

1k00

R36

221k

R35 27k4

C21

100nF

C22

100nF

R47 1k00

Q11 BC807-25

R46

221k

R43

221k

R44

221k

R45 221k

R41 15K

R40 10K

R28

DWG REV DATE: 10 Aug. 1998

(3A FUSE OPTIONAL)

CONN1

F/48 MALE

TITLE: MT-3 Transmitter Solder Side T/H Designations

DWG No: TX3AT8D

DWG REV DATE: 10 Aug. 1998

M2.5 x 10 PAN/PHIL.

SCREW (2)

Components Not Installed

MT-3 AM AMPLIFIER

GND: BLACK

+ 13.8 VDC: RED

MODULATION INPUT: YELLOW

ENA: BLUE

+ 9.5 VDC: ORANGE

RF IN

BLK

YEL

RED

BLUE

123456

ORG

5-4 MT-3 AM Transmitter Main Board Instruction Manual

DANIELS ELECTRONICS

5.2.2 MT-3 AM Transmitter Main Board Component Layout (Bottom)

MT3TXMNM3B

x J15 y

x J13 y

y J25 x

y J7 x

DANIELS

ELECTRONICS

J6 J7

InstalledNot Installed 'Y' Position 'X' PositionJ18

Installed

'Y' Position

'X' Position 'X' Position

'X' Position

MODE 1

MODE 2

MODE 3 MODE 4

AM/FM STANDBY MODES

STANDARD/LOW FREQUENCY MODULATION

STD MOD VER. LF MOD VER.DESIGN

J6 J7 J18

Installed 'X' Position 'X' Position

Not Installed 'Y' Position 'Y' Position

VICTORIA B.C.

DANIELS

ELECTRONICS

Transmitter Main Board Instruction Manual

5-5

5.2.3 Transmitter Main Board Schematic Diagram

DWG REV DATE: 9 OCTOBER 1998

DWG No.: MT3TXMNM4B

MM M

LLL

BOARD REV: 1.7 BOARD No.: 43-920917

TP34

C23

C17-C19

LPF6,LPF7 LPF11,LPF13

C9,C11,C16

Q11 R47

J35

U5R27

J10,J11

J1,J5,J8

FSW4

RELAY1

HIGHEST REFERENCE DESIGNATORS

LPF35

----- ----- -----

UNUSED REFERENCE DESIGNATORS

TIME OUT TIMER

APPROX 0.8 VDC

JF3-4

JF3-3

JF3-2

JF3-1

TO J25 PIN3

JP1-7

JP1-5JP1-4JP1-6JP1-2JP1-1JP1-3

YXY

UNDER U6

TITLE: MT-3 TRANSMITTER BOARD SCHEMATIC DIAGRAM

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

APRVD:DWG BY: MIKE GAUBE DATE: 8 APRIL 1992

JF1-1

JF1-3

JF2-2

JF1-2

JF2-1

FRONT PANEL N CONNECTOR

BACKPLANE CONNECTOR

LPF

LPF16

LPF

LPF17

LPF

LPF22

LPF

LPF5

LPF

LPF4

LPF

LPF19

LPF

LPF18

LPF

LPF20

LPF

LPF27

LPF

LPF21

LPF

LPF33

LPF

LPF12

LPF

LPF8

LPF

LPF10

LPF

LPF14

LPF

LPF26

LPF

LPF15

Z12

TX STANDBY

B12

PTT OUTPUT

B24

Z14

PTT NTO

B14

NCD4

NCD6

RLY POS

D10

NCD12

Z10

PTT WTO

B10

DIRECT MOD INPUT

Z28

SQL FLAT INPUT

Z20

SUBTONE INPUT #2

Z24

SUBTONE INPUT #1

B22

BALANCED INPUT #1

Z18

BALANCED INPUT #2

B18

MIC IN

MIC OUT

SQL DE-EMP INPUT

B20

+9.5V CONTINUOUS

GROUND

B30

GROUND

B32

GROUND

Z32

IMC1

D14

IMC2

D16

IMC3

D18

B16

Z16

RX MONITOR

B28

RX DATA IN

D30

TX DATA OUT

D28

BOOTSTRAP

D32

CHANNEL SEL 0 (Least Significant Bit)

D20

CHANNEL SEL 1

D22

CHANNEL SEL 2

D24

CHANNEL SEL 3 (Most Significant Bit)

D26

TX AUDIO CONTROL

Z22

VSWR REVERSEZ26

FORWARD POWER FAIL INDICATOR

B26

+10 TO +17 VOLTS +13.8 VDC NOMINAL

LPF

LPF2

LPF

LPF1

LPF

LPF34

LPF

LPF35

LPF

LPF23

LPF

LPF29

LPF

LPF28

LPF

LPF25

LPF

LPF24

LPF

LPF32

LPF

LPF31

LPF

LPF30

10uFC31.0uF

TP5

TP2

TP4

TP3

TP1

10nF

C13

TP6

TO ALL 9.5V SUPPLY POINTS

1.0uF

C10

J16

J17

TP20

TP18

TP22

TP17

TP19

TP21

NOT INSTALLED

R28

9.5V

27K4

BYD17J

1987

43210

RELAY1

BAS16D710R0

27K4

1K0

TP27

MC33172

aU1

MC33172

bU1

BYD17J

27K4

BYD17J

BAS16

10R0R51K0

27K4

TP28

10nF

100K0

R10

221K0

9.5V

TP26

MC14081

cU2

MC14081

dU2

100nF

9.5V

MC14081

bU2

MC14081

aU2

9.5V

D15N06V

BC807-25

10K0

R18

TP11

BC817-25

9.5V

BC817-25

BYD17J

TP7

D5P06V

J21

Vin Error Sd Gnd

Vout

Sense

5V Tap

8 5 3 4

1 2 6 7

LP2951

15K0

R30

9.5V

10nF

C14

82K5

R29

4.7uF

C15

J15J13

J14

PZT2222A

Q10

1K0

R26

27K4

R25

J12

9.5V

TO ALL 13.8V SUPPLY POINTS

13.8V

10uFC11.0uF

TP8

TP15

13.8V

TP9

TP16

TP14

1K0

R17

J18

10K0

R16

TP23

TP24

TP10

9.5V

9.5V SWITCHED

TO ALL 9.5V SWITCHED SUPPLY POINTS

TO ALL 9.5V PTT SWITCHED SUPPLY POINTS

9.5V PTT SWITCHED

MICROPHONE INPUT

BALANCED INPUT

+9.5V

+8.0V SWITCHED

TONE/DIGITAL INPUT

AUDIO OUTPUT

SUBTONE #1 INPUT

SUBTONE #2 INPUT

DIRECT MODULATION INPUT

AUDIO

SUBTONE #2 OUTPUT

TOT INPUT

TOT OUTPUT

GND GND

MT-3 AUDIO

PROCESSOR

13.8 V

QUALIFIED PTT

PTT

GND

CONTROL

216

4 5

AUDIO XFMR

10nF

C12

27K4

R13

27K4

R12

27K4

R11

10K0

R19

10K0

R15

10K0

R14

68K1

R20

10K0

R23

68K1

R24

100nF

10nF

J20

J22

J23

J24

J19

J25

+9.5V INPUT

+9.5V OUTPUT

LED ENA

GROUND

MIC PTT WTO

MIC PTT NTO

MIC AUDIO

MT-3 FRONT PANEL BOARD

RX AUDIO

SPARE

+13.8V

GROUND

RX MON

13.8V

RF IN

RF OUT

+9.5V+13.8V ENA GND F OR REV

MT-3 VHF/UHF AMPLIFIER MODULE

AUDIO

XXXX

LPF

LPF3

OPTIONAL

RLY NEG

68K1

R22

9.5V

BC817-25

TP30

TP29

D5P06V

10K0

R21

100nF

C22

221k

R39

C23 100nF

221k

R44

221k

R45

221k

R46

221k

R43

15k0

R41

27k4

R35

68k1

R33

221k

R31

1k00

R32

221k

R36

27k4

R34

100k

R38

1k00

R37

OPT

R42

J26

J27

J32

J28

100nF

C21

MC33172

Q11

BC807-25

SET RESET IN1 OUT1 OUT2 BYP CLK INH VSS

VDD

MONO

OSC INH

DEC

D C B A

MC14536B

1 2 3 4 5 6 7 8

16 15 14 13 12 11 10 9

TP25

5 6

MC33172

U7b

9.5V

4.7uF

C20

1k00

R47

10k0

R40

J29 J31

J35

J33

J34

TO ALL TOT 9.5V

TOT 9.5V

TP12

TP31 TP32

TP13

TP33

TP34

GROUND

Z30

OC-3 CRYSTAL CONTROL MODULE

P1-18 P1-20 P1-12 P1-19 P1-11 P2-2 P1-17 P1-9

P3-2

P3-1

P2-5

P1-10

P1-7

P1-3

P2-3

P1-16P1-8P1-15P1-14P1-6P1-13P1-5P1-4

P1-2 P1-1 P2-1 P2-4 P2-6

RF OUTPUT

REFERENCE INPUT

OS-3 SYNTHESIZER

456 7 8

MSD

FSW1

13572468

9 11131510121416

U3 MMAD1108

75318642

1513119 16141210

U4 MMAD1108

456 7 8

FSW2

456 7 8

FSW3

456 7 8

LSD

FSW4

9.5V SWITCHED

PTT

TOT INPUT

TOT OUTPUT

QUALIFIED PTT

JP1-7

2.2 Vdc

9.4Vdc

2.9 Vdc

2.9Vdc

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 65

SW1

c b a

NORM

f e d

PF3

MIC

43-921212

1234123

PF1

KEYED

123

PF2

DANIELS

ELECTRONICS

5-6 MT-3 AM Transmitter Main Board Instruction Manual

MT3TXMNM5A

5.3.2 MT-3 Front Panel Board Schematic

PF3

PF2

+13.8V

RX MON

+9.5V IN

SW1

NORM

PF3-1

PF3-2

PF3-4

PF3-3

PF2-1

SPARESPARE

+13.8V

RX AUDIO

+9.5V OUT

RX MON MIC PTT

MIC INPUT

8 7 6 5 4 3 2 1

PF2-4

PF2-3

PF2-2

PF1-3

PF1-2

PF1-1

PF1-4

PF1

+9.5V OUT

LED ENA

MIC PTT NTO

MIC PTT WTO

RX AUDIO

MIC INPUT

KEYED

MIC

MIC-3

MIC-4

MIC PTT

MIC-2

C1 N/I

MIC-1

TITLE: DATE.: DWN:

DWG No: BOARD NO.: BOARD REV.:

DANIELS

ELECTRONICS

MT-3 AM Transmitter Main Board Instruction Manual 5-7

DANIELS

ELECTRONICS

MT-3 FRONT PANEL BOARD

07 APRIL 1992

MT3TXMNM6A

43-921212

M. GAUBE

DWG REV DATE:

VICTORIA B.C .

APRVD:

28 MAY 97

1.2

VICTORIA B.C .

DANIELS

ELECTRONICS

DRAWN BY: SHANE A DWG REV DATE: AUGUST 24/98

DATE: 24 AUGUST 1998

DWG No: XXXXXAT1

ELECTRONICS

PCB 50049-04

TITLE:TX AM AUDIO PROCESSOR OUTLINE

VICTORIA B.C .

DANIELS

ELECTRONICS

DRAWN BY: SHANE A DWG REV DATE: AUGUST 24/98

DATE: 24 AUGUST 1998

DWG No: XXXXXAT1

ELECTRONICS

TITLE:TX AM AUDIO PROCESSOR OUTLINE (bottom)

DWG No: VAP130AS1C

TITLE: TX AM AUDIO PROCESSOR LAYOUT

- COMPONENTS NOT INSTALLED

- JUMPERS INSTALLED

DWG REV DATE:AUGUST 25/98

FB 1

4.7nF

20k0

30K9

100k0

C13

1.0nF

50k0

Automatic

Modulation

Control Input

Adjust

5k0

Microphone

Input Level

Adjust

U1 SA571D

680nF

C21

4.7uF

C12

4.7uF

680nF

4.7uF

R26

3M3

100nF

R27

681R0

R16 5k0

Balanced

Input Level

Adjust

R17

10k0

R10

27K4

R11

27K4

C11

2.2uF

R13

18k2

R14

100k0

Modualtion

Control Output

Adjust

R22

3K48

R25

82k5

10k0

MC33174

C23

220pF

C19

1.0uF

R18

470k0

DWG No: VAP130AS2C

TITLE: TX AM AUDIO PROCESSOR SURFACE MOUNT DESIGNATIONS

10nF

JU1

JU8

JU4

JU7

DWG REV DATE: MARCH 06 /98

JU3 Y

JU6

JU5

C22

680pF

R28 82k5

JU2

C20

220pF

C25

150pF

C17

330pF

R23

51k1

R32

51k1

R31 15k4

R24

15k4

R30

47k5

R20

39k2

R29 5k11

R19 5k11

C18

220pF

R15

49k9

C14

100nF

JU9

4k75

123

DWG No: VAP130AT1A

TITLE: AM TRANSMITTER THROUGH HOLE LAYOUT

1N5221B

C10

470nF

P 3P 2P 5P 1

DWG No: VAP130AT2B

TITLE: AM TRANSMITTER THROUGH HOLE DESIGNATIONS

C15

4.7nF

C16

2.2nF

1k2 TEMP

DWG REV DATE: OCTOBER / 98

wo # xxxx

5-8

5.4 MT-3 AM Audio Processor Electrical Assembly

5.4.1 MT-3 AM Audio Processor Component Layout

DANIELS

ELECTRONICS

MT-3 AM Transmitter Main Board Instruction Manual

TP 6

TP 8

TP 5

TP 4

TP 3

TP2

P 3

P 2

P 5

TP7

P 1

123

Solder Side

Component Side

MT3AMTXM8B

TP1

DANIELS ELECTRONICS

VICTORIA B.C.

DANIELS ELECTRONICS

DWG No: MT3AMTXM9B

TITLE: MT-3 AM Tx AUDIO BOARD SCHEMATIC DIAGRAM

BOARD REV: 04

5.4.2 MT-3 AM Audio Processor Schematic Diagram

MT-3 AM Transmitter Main Board Instruction Manual

JU9

R12, R21C4, C24

ALC Bypass

BOARD No: 50049-04

TP8

Approx. 200mV rms @ 90% mod.

DWG REV DATE: 19 MAY 98

------U2

R32P9

FB1D2C25

3.0 KHZ BUTTERWORTH LOW PASS FIILTER

3.0 KHZ BESSEL LOW PASS FILTER

DATE: MARCH 1998

Automatic Level Control

OPTIONAL

5-9

Automatic Modulation Control

DWN BY: STAN POLYAKOV.

13.8 Vdc

9.5 Vdc

Balanced Input

Mod output

AMC Bypass

Modulation Control Output Adjust

Balanced Input Level Adjust

Automatic Modulations Control Input Adjust

Microphone

Microphone Input Level Adjust

HIGHEST REFERENCE DESIGNATORS

UNUSED REFERENCE DESIGNATORS

APRVD:

FB1

4.7nF

R1 5K0

TP1

C2 470nF

R4 50K0

TP2

Vcc

Rect In

Var G

Rect Cap

Output

Inv In

THD Trim

GND

aU1

SA571D

Rect In

Var G

Rect Cap

Output

Inv In

THD Trim

bU1

SA571D

R6 100K0

TP3

C3 680nF

C6 100nF

C7 10nF

TP4

680nF

C8 4.7uF

470nF

C10

18K2

R13

R16 5K0

C12

4.7uF

C13

1.0nF

470K0

R18

TP5

TP6

C21

4.7uF

TP8

MT-3 TX TIME-OUT-TIMER

8.0V

9.5V

8.0V

-1P7

-1P8

-1P9

-1P6

-1J7

-1J8-1J6

-1J5

D1 1N5221B

D2 1N5221B

R27 681R0

C11

2.2uF

TP7

R5 30K9

MC33174

8.0V

49K9

R15

100nF

C14

2.2nF

C16

U2 MC33174

R14 100K0

C5 470nF

10K0

R17

4.7nF

C15

51K1

R32

220pF

C18

5K11

R29

5K11

R19

15K4

R24

15K4

R31

51K1

R23

82K5

R28

680pF

C22

220pF

C23

JU5

82K5

R25

JU7

JU8

R20 39K2

R30 47K5

C17 330pF

C25 150pF

R2 20K0

C20 220pF

JU6

R22 3K48

JU4

C19

1.0uF

R9 10K0

R10 27K4

R11 27K4

R26 3M30

JU3

JU9

R8 4K75

R7 1K2

JU2

JU1

VICTORIA B.C .

DATE: 15 APRIL 1996

DANIELS

ELECTRONICS

BOARD No.: 50027-02 DWG REV DATE:

TITLE: TX AP TIME OUT TIMER COMPONENT SIDE

DWG No: TOTAS

50027-02

INSTALL JUMPERS

VICTORIA B.C .

DATE: 15 APRIL 1996

DANIELS

ELECTRONICS

DWG REV DATE:

TITLE: TX AP TIME OUT TIMER COMPONENT SIDE SM LAYOUT

DWG No: TOTAS1

100nF

221k

100k

27k4

1k00

R10

10k0

68k1

100nF

27k4

221k

1k00

MC33172

4.7µF

R11

15k0

R17

1k00

BC807-25

221k

MC14536B

R12

opt.

100nF

J5-1

J7-1

J8-1

J6-1

JU3

JU4

JU5

JU6

JU1

JU2

R13

221k

R14

221k

R15 221k

R16

221k

J5-1

J7-1

J8-1

J6-1

VICTORIA B.C .

DATE: 15 APRIL 1996

DANIELS

ELECTRONICS

DWG REV DATE: 2 SEPTEMBER 1997

TITLE: TX AP TIME OUT TIMERCOMPONENT SIDESM / TH DESIGNATIONS

DWG No: TOTAS2A

R12

opt.

100nF

J5-1

J7-1

J8-1

J6-1

J5-1

J7-1

J8-1

J6-1

VICTORIA B.C.

DANIELS

ELECTRONICS

Vin

Vout

9.5V

2.4V

2.0V

2.2VDC

9.4VDC

2.9VDC

0.021VDC

0.135VDC

APPROX0. 8VDC

2.9VDC

DWN BY: MI CHAEL GAUBE

APRVD:

TITLE: MT-3 TXTIME OUT TIMERSCHEMATICDIAGRAM

DWG REV DATE: 16 J ANUARY 19 96

DATE: 19 J ANUARY 199 6 DWGNo: MT3APM4

BOARDNo: 50027-02

BOARDREV: VERSION0.2

-----

HIGHESTREFERENCE DES IGNATO RS

----- -----

UNUSED REFERE NCE DESIG NATORS

C4 J8 Q1 R17 U2

J1-J4

C3 100nF

R9 221k

100nF

R14 221k

R15 221k

R16 221k

R13 221k

R11 15k0

R10 10k0

R5 27k4

R3 68k1

R1 221k

R2 1k00

R6 221k

R4 27k4

R8 100k

R7 1k00

R12 OPT

R17 1k00

JU1

JU2

JU4 JU5 JU6JU3

+9.5V_CONTINUOUS

4.7uFC2100nF

SET RESET IN1 OUT1 OUT2 BYP CLK INH VSS

VDD

MONO

OSC INH

DEC

D C B A

MC14536B

1 2 3 4 5 6 7 8

16 15 14 13 12 11 10 9

+9.5V_CONTINUOUS

5 6

bU1

MC33172

U1 MC33172

BC807-25

TOT_I/P_TRIGGER

TOT_O/P_TRIGGER

GND

5-10

5.4.3 TX Time-Out-Timer Electrical Assembly

5.4.3.1 TX Time-Out-Timer Component Layout

DANIELS

ELECTRONICS

MT-3 AM Transmitter Main Board Instruction Manual

5.4.3.2 TX Time-Out-Timer Schematic Diagram

MT3APM3 MT3APM5

6 PARTS LISTS

6.1 Transmitter Main Board Parts List

6.1.1 Transmitter Main Board Electrical Parts List

Ref Design Description Part

C1 CAP, SM, 10uF TANT, 20%, 35V 1055-6D106K35 C2 CAP, SM, 10uF TANT, 20%, 35V 1055-5B105M35 C3 CAP, SM, 10uF TANT, 20%, 16V 1055-6C106M16 C4 CAP, SM, 10uF TANT, 20%, 16V 1055-5A105M16 C5 CAP, SM, 100nF CER, 0805, X7R 1008-5A104K5R C6 CAP, SM, 10nF CER 0805 X7R 50V 1008-4A103K5R C7 CAP, SM, 10nF CER 0805 X7R 50V 1008-4A103K5R C8 CAP, SM, 100nF CER, 0805, X7R 1008-5A104K5R C10 CAP, SM, 10uF CER/2225 50 X7R 1008-6H105J5R C12 CAP, SM, 10nF CER 0805 X7R 50V 1008-4A103K5R C13 CAP, SM, 10nF CER 0805 X7R 50V 1008-4A103K5R C14 CAP, SM, 10nF CER 0805 X7R 50V 1008-4A103K5R C15 CAP, SM, 47uF TANT, 10%, 16V 1055-5B475K16 C20 CAP, SM, 47uF TANT, 10%, 16V 1055-5B475K16 C21 CAP, SM100nF CER,0805,X7R,50V 1008-5A104K5R C22 CAP, SM100nF CER,0805,X7R,50V 1008-5A104K5R C23 CAP, 100nF FILM, MMK5, 10%, 63V 1016-5A104K63

No.

D1-D6 DIODE, BYD17J RECTIFIER SOD87 2101-BYD17J00 D7 DIODE, BAS16 SWITCHING, SOT23 2100-BAS16000 D8 DIODE, BAS16 SWITCHING, SOT23 2100-BAS16000

F1 FUSE, 3AMP FAST-BLO, 1-1/4 IN. 5604-5GAGC030

FSW1-4 SWITCH, BCD-10 STEPS,5 PIN,PCB 5273-10BCD001

J30 CONNECTOR, F\48_MALE, R\A_P 3720-6048M0RA

LPF1-35 FILTER, SM, LPF1 EM1\LPF, 360pF F 1306-T361F2D5

Q1 TRANSISTOR, BC817-25 NPN SOT23 2120-BC817025 Q3 TRANSISTOR, BC817-25 NPN SOT23 2120-BC817025 Q4 TRANSISTOR, BC817-25 NPN SOT23 2120-BC817025 Q5 MOSFET, D5P06V P-CHAN., DPAK 2144-D5P06V00 Q6 TRANSISTOR, BC817-25 NPN SOT23 2120-BC817025 Q7 MOSFET, D5P06V P-CHAN., DPAK 2144-D5P06V00 Q8 TRANSISTOR, BC807-25 PNP SOT23 2120-BC807025 Q9 MOSFET, D15N06V N-CHAN., DPAK 2144-D15N06VO Q10 TRANSISTOR, PZT2222A NPN ST223 2120-PZT2222A Q11 TRANSISTOR, BC807-25,PNP,SOT23 2120-BC807025

R1 RES., SM, 10R0 0805, 1% 100ppm 1150-1A10R0FP R2 RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP R3 RES, SM, 1K0 0805, 1% 100ppm 1150-3A1001FP R4 RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP

DANIELS

ELECTRONICS

MT-3 AM Transmitter Main Board Instruction Manual 6-1

Ref Design Description Part

R5 RES, SM, 10R0 0805, 1% 100ppm 1150-1A10R0FP R6 RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP R7 RES, SM, 1K0 0805, 1% 100ppm 1150-3A1001FP R8 RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP R9 RES, SM, 221K0 0805, 1% 100ppm 1150-5A2213FP R10 RES, SM, 100K0 0805, 1% 100ppm 1150-5A1003FP R11 RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP R12 RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP R13 RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP R14 RES, SM, 10K0 0805, 1% 100ppm 1150-4A1002FP R15 RES, SM, 10K0 0805, 1% 100ppm 1150-4A1002FP R16 RES, SM, 10K0 0805, 1% 100ppm 1150-4A1002FP R17 RES, SM, 1K0 0805, 1% 100ppm 1150-3A1001FP R18 RES, SM, 10K0 0805, 1% 100ppm 1150-4A1002FP R19 RES, SM, 10K0 0805, 1% 100ppm 1150-4A1002FP R20 RES, SM, 68K1 0805, 1% 100ppm 1150-4A6812FP R21 RES, SM, 10K0 0805, 1% 100ppm 1150-4A1002FP R22 RES, SM, 68K1 0805, 1% 100ppm 1150-4A6812FP R23 RES, SM, 10K0 0805, 1% 100ppm 1150-4A1002FP R24 RES, SM, 68K1 0805, 1% 100ppm 1150-4A6812FP R25 RES, SM, 27K4 0805, 1% 100ppm 1150-4A2742FP R26 RES, SM, 1K0 0805, 1% 100ppm 1150-3A1001FP R28 RES, SM, NOT INSTALLED 0805, 1% 100ppm 1150-4A1502FP R29 RES, SM, 82K5 0805, 1% 100ppm 1150-4A8252FP R30 RES, SM, 15K0 0805, 1% 100ppm 1150-4A1502FP R31 RES, SM221k 0805, 1%, 100ppm 1150-5A2213FP R32 RES, SM, 1k00 0805, 1%, 100ppm 1150-3A1001FP R33 RES, SM, 68k1 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 1150-3A1001FP R38 RES, SM, 100k 0805, 1%, 100ppm 1150-5A1003FP R39 RES, SM, 221k 0805, 1%, 100ppm 1150-5A2213FP R40 RES, SM, 10k0 0805, 1%, 100ppm 1150-4A1002FP R41 RES, SM, 15k0 0805, 1%, 100ppm 1150-4A1502FP R42 RESOPT METAL FILM, 5%,05W OPTIONAL R43 RES, SM, 221k 0805, 1%, 100ppm 1150-5A2213FP R44 RES, SM, 221k 0805, 1%, 100ppm 1150-5A2213FP R45 RES, SM, 221k 0805, 1%, 100ppm 1150-5A2213FP R46 RES, SM, 221k 0805, 1%, 100ppm 1150-5A2213FP R47 RES, SM, 1k00 0805, 1%, 100ppm 1150-3A1001FP

RELAY1 RELAY, 9VDC RELAY 9VDC, 2_FORM_C P 5310-2C09P005

T1 TRANSFORMER, AUDIO XFMR AUDIO 600R 1:1 1280-600P6005

U1 IC, MC33172 DUAL_OP_AMP, SO- 2302-33172N08 U2 IC, MC14081 QUAD_2I\P_AND, S 2375-40810N14 U3 IC, MMAD1108 8_DIODE\ARY. SO1 2331-11080N16 U4 IC, MMAD1108 8_DIODE\ARY. SO1 2331-11080N16 U6 IC, LP2951 PROG._VOLT_REG S 2305-29510N08

DANIELS

ELECTRONICS

6-2 MT-3 AM Transmitter Main Board Instruction Manual

Ref Design Description Part

No.

U7 IC, MC33172 DUAL OP AMP, SO-8 2302-33172N08 U8 IC, MC14536B PROGRAM TIMER, SO-16W 2375-45360W16

6.1.2 Transmitter Main Board Mechanical Parts List

Description Part No. Qty.

CABLE, SMB-SMB PLUG, RG316,12cm $7910-WP0WP012 1 (Crystal Control) CABLE, SMA-SMB PLUG, RG188,15cm $7910-SP0WP015 1 (Synthesizer) CABLE, SMA PLUG-PLUG, RG188, 19 cm $7910-SP0SP019 1 (Opt. - Synth only)

CONN, TYPE F 48 MALE, RA, PCB MTG 3720-6048M0RA 1 CONN/RF, SMA JACK-JACK BULKHEAD 5118-J875BJ05 1 (Opt. - Synth only)

CASE, 14HP RF PLUG-IN, MT-3 TX 3802-62502010 1

FASTENER, QUICK RELEASE 3702-10000120 4

GASKET, BeCu,3FINGER,.25",CLIP 5630-12023250 2

HANDLE, FRONT PANEL, 14HP, GREY 3702-10000614 1

HOLE PLUG, 0.25" HOLE, NYLON, BLACK 5671-250N062B 1

LOCKWASHER, M3, SPLIT,A2 STEEL 5814-3M0LK00S 4

MIC CONN, 4 PIN MALE, BLACK 5040-114ST0BK 1

NAMEPLATE, BLANK, 14HP, ALUM. 3702-10001214 1

NUT, M2.5, HEX, 5.0mm, STEEL/Ni 5813-2M5HX50N 2 NUT, M2.5, SQUARE, 5.0mm, ZINC 5813-2M5SQ50Z 2 NUT PRESS, M2.5, 5.6mm OD, PC MNT 5833-T2M55615 1

PANEL/FRNT,W/IDENT:TX-EXTR.VER 3802-61002101 1 PANEL, REAR,POS.4,14HP EXTRSN. 3702-63002101 1

SCREW, M3 x 8, PAN/PHIL, BLACK 5812-3M0PP08T 4 SCREW, M3 x8,OVAL C/S/PHIL,A2 5812-3M0VP08S 4 SCREW, M2.5 X 10, CHEESE/SLOT, A2 5812-2M5CS10S 2 SCREW, M2.5 X 12, FLAT/PHIL, Ni 5812-2M5FP12N 2 SCREW, M3 X 6, OVAL C/S/PHIL, Ni 5812-3M0VP06N 2 SCREW, M3 X 6 PAN/PHIL, A2 5812-3M0PP06S 4 SCREW, M5 X 8 FLAT/PHIL, A2 5812-5M0FP08S 4

TAB, GROUND, MT-3 SYNTH., BRASS 3702-67800905 2 (Synthesizer only)

WIRE, TFE/STRAND., 24AWG, VIOL (13.5 cm) 7121-24S19367 1 WIRE, TFE/STRAND., 24AWG, ORG (12.5 cm) 7121-24S19363 1 WIRE, TFE/STRAND., 24AWG, RED (11.0 cm) 7121-24S19362 1 WIRE, TFE/STRAND., 24AWG, YELLOW (9.5 cm) 7121-24S19364 1

DANIELS

ELECTRONICS

MT-3 AM Transmitter Main Board Instruction Manual 6-3

Description Part No. Qty.

WIRE, TFE/STRAND., 24AWG, BLACK (9.0 sm) 7121-24S19360 1 WIRE, TFE/STRAND., 24AWG, BROWN (16.0sm) 7121-24S19361 1

6.1.3 MT-3 Front Panel Board Electrical Parts List

Ref Desig Description Part No.

D1 LED, RED, 5 mm OD, T-1 3/4 2010-503001RD

PF 1 HEADER, 0.1", RA, 2 ROW X 2 PIN 5010-H202RA9T PF 2 HEADER, 0.1", RA, 2 ROW X 2 PIN 5010-H202RA9T

SW1 SWITCH, TOG/DPDT, ON-OFF-ON, PCB/STR 5215-T2031V02

PCB 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

Ref Design Description Part No.

C1 CAP., SM, 4.7nF CER., 1206, X7R 1008-3B472K5R C2 CAP., 470nF FILM, MMK5,10%,63V 1016-5D474K63 C3 CAP., SM, 680nF TANT., 10%, 35V 1055-4B684K35 C5 CAP., 470nF FILM, MMK5,10%,63V 1016-5D474K63 C6 CAP., SM, 100nF CER., 0805, X7R, 50 1008-5A104K5R C7 CAP., SM, 10nF CER., 0805, X7R 1008-4B103K5R C8 CAP., SM, 680nF TANT., 10%, 35V 1055-4B684K35 C9 CAP., SM, 4.7uF TANT., 10%, 16V 1055-5B475K16 C10 CAP., 470nF FILM, MMK5,10%,63V 1016-5D474K63 C11 CAP., SM, 2.2uF TANT., 20%, 20V 1055-5B225K20 C12 CAP., SM, 4.7uF TANT., 10%, 16V 1055-5B475K16 C13 CAP., SM, 1.0nF CER., 0805, X7R, 50V 1008-3A102K5R C14 CAP., SM, 100nF CER., 0805, X7R, 50V 1008-5A104K5R C15 CAP., 4.7nF FILM, MMK5, 10%, 63V 1016-3A472K63 C16 CAP., 2.2nF FILM, MMK5, 10%, 63V 1016-3A222K63 C17 CAP., SM, 330pF CER., 0805,C0G 1008-2A331J1G C18 CAP., SM, 220pF CER., 0805,C0G 1008-2A221J1G C19 CAP., SM, 1.0uF TANT., 20%, 35V 1055-5B105M35 C20 CAP., SM, 220pF CER., 0805,C0G 1008-2A221J1G C21 CAP., SM, 4.7uF TANT., 10%, 16V 1055-5B475K16 C22 CAP., SM, 680pF CER., 1206,C0G 1008-2B681J1G C23 CAP., SM, 220pF CER., 0805,C0G 1008-2A221J1G C25 CAP., SM, 150pF CER., 0805,C0G 1008-2A151J1G

D1 DIODE, 1N5221B ZENER 3.9V,DO35 2002-1N5221B0 D2 DIODE, 1N5221B ZENER 3.9V,DO35 2002-1N5221B0

FB1 FERRITE BEAD, SM,FERRITE BEAD 43MIX,.18x.12 1213-43181200

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6-4 MT-3 AM Transmitter Main Board Instruction Manual

Ref Design Description Part No

P1-P5 HEADER 01", R/A, 2 ROW X 2PIN 5010-H202RA9T PCB AUDIO PROCESSOR, VT-3A130 4322-30500494

R1 POT., SM, 5K0 4mm SQ, 11T,SIDE 1174-DM2502J0 R2 RES., SM, 20K0 0805, 1%,100ppm 1150-4A2002FP R3 RES., SM, 49K9 0805, 1%,100ppm 1150-4A4992FP R4 POT., SM, 50K0 4mm SQ, 50K, 11T,SIDE 1174-DM3503J0 R5 RES., SM, 30K9 0805, 1%,100ppm 1150-4A3092FP R6 RES., SM, 100K0 0805, 1%,100ppm 1150-5A1003FP R7 TEMPSISTOR, 1K2 PTC, 10%,AXIAL 1181-3AGD122K R8 RES., SM, 4K75 0805, 1%,100ppm 1150-3A4751FP R9 RES., SM, 10K0 0805, 1%,100ppm 1150-4A1002FP R10 RES., SM, 27K4 0805, 1%,100ppm 1150-4A2742FP R11 RES., SM, 27K4 0805, 1%,100ppm 1150-4A2742FP R13 RES., SM, 18K2 0805, 1%,100ppm 1150-4A1822FP R14 POT., SM, 100K0 4mm SQ, 100K,11T,SIDE 1174-DM4104J0 R15 RES., SM, 49K9 0805, 1%,100ppm 1150-4A4992FP R16 POT., SM, 5K0 4mm SQ, 11T,SIDE 1174-DM2502J0 R17 RES., SM, 10K0 0805, 1%,100ppm 1150-4A1002FP R18 RES., SM, 470K0 0805, 1%,100ppm 1150-5A4703FP R19 RES., SM, 5K11 0805, 1%,100ppm 1150-3A5111FP R20 RES., SM, 39K2 0805, 1%,100ppm 1150-4A3922FP R22 RES., SM, 3K48 0805, 1%,100ppm 1150-3A3481FP R23 RES., SM, 51K1 0805, 1%,100ppm 1150-4A5112FP R24 RES., SM, 15K4 0805, 1%,100ppm 1150-4A1542FP R25 RES., SM, 82K5 1206, 1%,100ppm 1150-4B8252FP R26 RES., SM, 3M30 0805, 5%,200ppm 1150-6A3304JL R27 RES., SM, 681R0 0805, 1%,100ppm 1150-2A6810FP R28 RES., SM, 82K5 1206, 1%,100ppm 1150-4B8252FP R29 RES., SM, 5K11 0805, 1%,100ppm 1150-3A5111FP R30 RES., SM, 47K5 0805, 1%,100ppm 1150-4A4752FP R31 RES., SM, 15K4 0805, 1%,100ppm 1150-4A1542FP R32 RES., SM, 51K1 0805, 1%,100ppm 1150-4A5112FP

U1 IC, SA571D COMPANDOR, SO-16L 2327-SA571D00 U2 IC, MC33174 QUAD OP AMP,SO-14 2304-33174N14

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6-6 MT-3 AM Transmitter Main Board Instruction Manual

7 REVISION HISTORY

ISSUE DATE REVISION

1 May 97 • First Issue.

2 March 98 • To improve performance and efficiency of the Audio Processor Board.

ECO #541.

- C18 was 82pF is now 150pF

- R20 was 8k25 is now 3k01

- R21 was 1M0 is now not installed

- R26 was 470k is now 3M30

- Moved SM jumpers to the SM side of the PCB. Moved P1, P2 & P5 to the correct positions. Added land pattern to the PCB for R21.

3 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. ECO #563.

- The AM Audio Processor PCB was 50049-02 is now 50049-04.

• Updated the DE logo and added the statutary notice to the title page. Corrected the drawing numbers on the Transmitter layout and schematic drawing.

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MT-3 AM Transmitter Main Board Instruction Manual 7-1

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7-2 MT-3 AM Transmitter Main Board Instruction Manual

Daniels Electronics Ltd. MT-3, A21-TX3-00, A22-VAP130 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual