User Manuals: Johnson DM3474 UHF Data Transceiver

Manuals and User Guides for Johnson DM3474 UHF Data Transceiver. We have 1 Johnson DM3474 UHF Data Transceiver manual available for free PDF download: Service Manual

Johnson DM3474 Service Manual

Johnson DM3474 Service Manual (64 pages)

UHF High Specification Data Module Transceiver

Brand: Johnson | Category: Transceiver | Size: 0 MB

Table of Contents

Table of Contents
5
1 General Information

9
- Scope of Manual
  9
- Equipment Description
  9
  - General
    9
  - Dm3474 Synthesizer Programming
    9
- Transceiver Identification
  9
- Part Number Breakdown
  10
- Accessories
  10
- Factory Customer Service
  10
- Product Warranty
  11
- Replacement Parts
  11
- If a Problem Arises
  12
  - Factory Repair
    12
- General Specifications
  
  13
2 Installation

15
- Pre-Installation Checks
  15
- Interfacing with Data Equipment
  15
  - Dm3474 Only
    15
3 Programming

17
- Introduction
  17
- Dm3474 Synthesizer Data Protocol
  17
  - D-Word
    17
  - B-Word
    18
  - A-Word
    18
- Serial Input Word Format
  21
- Receive to Transmit Sequence
  22
- Rx to Tx Timing Diagram
  22
- Transmit to Receive Sequence
  23
- Tx to Rx Timing Diagram
  23
4 Circuit Description

25
- General
  25
  - Introduction
    25
- Synthesizer
  26
  - Introduction
    26
  - Transmitter
    26
- Data Transceiver Block Diagram
  27
- U801 Synthesizer Block Diagram
  28
  - Voltage-Controlled Oscillator
    29
  - Vco and Reference Oscillator Modulation
    30
  - Cascode Amplifiers (Q851/Q852)
    30
  - Amplifier (Q853)
    30
  - Voltage Filter (Q832)
    30
  - Vco Frequency Shift (Q831)
    30
  - Synthesizer Integrated Circuit (U801)
    31
  - Lock Detect
    31
- Receiver Circuit Description
  32
- U241 Block Diagram
  33
- Transmitter Circuit Description
  34
  - Buffer (Q851)
    34
  - Pre-Driver (Q501), Driver (Q521)
    35
  - Power Control Supply
    35
  - Final (Q541), Power Control (U542)
    35
  - Antenna Switch (Cr561, Cr562)
    35
5 Servicing

37
- General
  37
  - Periodic Checks
    37
  - Surface-Mounted Components
    37
  - Schematic Diagrams and Component Layouts
    37
  - Replacement Parts List
    37
  - Tcxo Module Not Serviceable
    37
- Synthesizer Servicing
  37
  - Introduction
    37
  - Reference Oscillator
    38
  - Vco
    38
  - Synthesizer (U801)
    38
- Receiver Servicing
  39
- Transmitter Servicing
  40
  - Supply Voltages and Current
    40
- Receiver Servicing Flowchart
  40
- Transmitter Servicing Flowchart
  41
6 Alignment Procedure and Performance Tests

43
- General
  43
- Dl3474 Transceiver Only
  43
- Transmitter Test Setup
  44
  - Modulation Flatness Alignment
    45
  - Receiver Alignment
    46
  - If and Audio Adjustments
    46
- Receiver Test Setup
  46
- Alignment Points Diagram
  48
7 Parts List

49
8 Schematics and Component Layouts

60

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