E.F. Johnson 7243 LTR-NET Manuals

Manuals and User Guides for E.F. Johnson 7243 LTR-NET. We have 1 E.F. Johnson 7243 LTR-NET manual available for free PDF download: Service Manual

E.F. Johnson 7243 LTR-NET Service Manual

E.F. Johnson 7243 LTR-NET Service Manual (115 pages)

7.5VDC 1 and 4 Watts Part No. 242-7243-xxx

Brand: E.F. Johnson | Category: Portable Radio | Size: 6.8 MB

Table of Contents

Table of Contents
3
General Information

7
Scope of Manual

7
Transceiver Description

7
Part Number Breakdown

7
Transceiver Identification

7
Transceiver Tuning

7
Accessories

7
Factory Customer Service

8
Factory Returns

8
Replacement Parts

9
Internet Home Page

9
Disassembling Transceiver

9
Battery Charger Information

10
- General
  10
- Fast Charging
  10
- Slow Charging
  10
- Charger Indicators
  10
- Battery Charger
  10
- 7243 Specifications
  
  11
Operation

12
- Top Panel Controls
  12
Features

12
- General Features
  12
- LTR-Net Features
  12
- LTR Features
  12
- Conventional Features
  12
Controls and Display

13
- Top and SIDE Controls
  13
- Side Controls
  13
- Display
  13
- Front Panel Keys
  14
Basic Operation

16
- Power-Up Sequence
  16
- Backlight Operation
  16
- Setting Volume Levels
  16
- System/Group Display Mode
  17
- System and Group Select
  17
- Keypad Disable (Standard)
  17
- Keypad Disable (Using PASSWORD)
  17
- Low Battery Indication
  18
- Option Switches
  18
- Displaying Software Revision Number
  18
- LTR-Net, LTR, and Conventional Operation
  18
- Localities, Systems, and Groups
  19
- Placing and Receiving Standard Group Calls
  20
- Receiving a Standard Group Call
  20
General Features

20
- Bank Select
  20
- Call Indicator
  21
- Companding
  21
- Emergency Switch
  21
- Encryption
  22
- Home System/Group Select
  22
- Option Select
  22
- Power Select
  22
- Proceed (Clear-To-Talk) Tone
  22
- Receive-Only Groups
  22
- Time-Out Timer
  22
- Tone Select
  23
- Menu Mode and Option Switch Functions
  23
Option Switches and Menu Mode

23
- Option Switches
  23
- Menu Mode
  23
System and Group Scanning

24
- General
  24
- Scan On-Off
  24
- Scan Types
  25
- LTR-Net Mode Scanning
  25
- LTR Mode Scanning
  25
- Conventional Mode Scanning
  26
- Scan List Programming
  26
- Saving Scan List
  26
- Scan Delay and Continue Timers
  26
- Transmitting in the Scan Mode
  27
Dial Mode

27
- Introduction
  27
- Selecting Dial Mode
  28
- Dialing a Number
  28
- Sending the Number
  28
- Storing Numbers in Memory
  28
- Recalling Numbers from Memory
  29
- Exiting Dial Mode
  29
Ltr-Net and Ltr Features

29
- Standard Group Calls
  29
- Calls on Priority ID Codes
  29
- Block ID Codes and Access Priority
  30
- Transmit Inhibit
  30
Ltr-Net Features

30
- LTR-Net Standard Calls
  30
- LTR-Net Special Calls
  30
- Busy Queuing/Free System Ringback
  33
- Roaming (Auto-Registration)
  33
- Over-The-Air Locality Channel Updates
  35
- Transceiver Disable
  35
- Home Channel Aliasing
  35
Ltr Features

36
- Standard Group Calls
  36
- Telephone Calls
  36
- LTR Features Not Available
  37
Conventional Features

37
- Busy Indicator
  37
- Monitor Mode
  37
- Transmit Disable on Busy
  38
- Squelch Adjust
  38
- Talk-Around
  38
- Call Guard Squelch
  38
- External Encoders and Decoders
  39
Supervisory Tones

39
- General Tones
  39
- LTR-Net Special Call Tones
  40
- LTR Telephone Call Tones
  40
- Display Messages
  41
- Menu Mode Messages
  42
Test Functions

42
- Programmer Error Code Screen
  43
Error Codes

42
- General
  42
- Reading Error Codes
  43
Programming

44
General

44
- Programming Setup
  44
- Minimum Computer Requirements
  44
- Remote Programming Interface (RPI)
  44
- RPI Cables
  45
- EEPROM Data Storage
  45
- Hardware Hookup
  45
Miscellaneous Program Information

45
- Basic Windows Knowledge
  45
- Software Installation
  45
- Starting Program
  46
Main Window Description

46
- Title Bar
  46
- Menu Bar
  46
- Toolbar
  46
- Main Window Panes
  47
- Status Bar
  47
Programming Procedure

47
- Introduction
  47
- Getting Started
  47
- Programming Main Radio Parameters
  47
- Locality Programming
  48
- Main Window
  48
  - System Programming
    49
  - Group Programming
    49
  - Bank Programming
    49
  - Programming Transceiver
    49
File Menu

50
Edit Menu

50
- Introduction
  50
- Edit Radio Type Screen
  51
- Basic Parameters Screen
  51
- Timing Parameters Screen
  51
- Menu Items Screen
  52
- Key Assignment Screen
  52
- Edit Telephone Numbers Screen
  52
- Edit Locality Screen
  53
- Edit System Screen
  54
- Edit Groups Screen
  54
- Edit Banks Screen
  54
- Edit Unique ID Screen
  54
Transfer Menu

54
View Menu

55
Comports Menu

56
Help Menu

56
Additional Programming

56
- Information
  
  56
- Program Key
  56
- Multiple Home Repeaters
  56
- Channel Number Programming
  56
- Repeater Numbering
  56
- Specifying RIC-Equipped Repeaters
  57
- Test Locality
  57
Updating Radio Software

57
Circuit Description

64
Power Switching and Regulation

64
- Power Switching
  64
- Five-Volt Regulators (U205, U206)
  64
Synthesizer Description

64
Receiver Circuit Description

66
Transmitter Description

67
Control Logic and Display

68
Receive Audio Processing

71
- Introduction
  71
- Bandpass Filter (U101)
  71
- Expander (U204)
  71
- Audio Amplifier (U101, U102)
  72
Receive and Transmit Data Processing

72
- Receive Data Filter/Detector (U102A/B, U103A/B)
  72
- Transmit Data Filter (U145A/B)
  72
Smartnet Data Processing

73
Transmit Audio Processing

73
Alignment Procedure

75
- Alignment Setup Diagram
  75
General

75
- Introduction
  75
- Special Test Code Required
  75
Loading Operating Code

76
- General
  76
- Saving Personality Information
  76
- Loading Test Code
  76
Pctune Description

77
- Pctune Menu Bar
  77
- Radio Tune Screen
  78
- Pctune Tune Radio Screen
  78
Alignment Procedure

79
- Test Setup
  79
Frequency Check/Adjust

80
High Rf Power Adjust

80
Low Rf Power Adjust

80
Modulation Balance

80
- Internal Adjustment Points
  81
Data Deviation

80
Audio Deviation

80
Receive Bandpass Filter Adjust

81
Rssi and Squelch Adjust

81
Opening Transceiver

81
Receiver Performance Tests

82
- Preliminary Setup
  82
- SINAD Sensitivity
  82
- Squelch Sensitivity
  82
- Audio Power and Distortion
  82
- Receiver Current Drain
  82
Transmitter Performance Tests

83
- Power Output
  83
- Transmit Frequency
  83
- Transmit Modulation
  83
- Transmitter Current Drain
  83
Test Code Functions

84
- General
  84
- Test Channels
  84
- Modulation Modes
  84
- Miscellaneous Functions
  84
- Parameter Edit Modes
  85
Ltr-Net Overview

86
- LTR-Net System Diagram
  86
  - LTR-Net Features
    87
  - Definitions
    88
Introduction

86
- General
  86
- Compatibility with LTR
  86
System Architecture

88
- Introduction
  88
- Subscriber Units
  88
- Repeaters
  89
- 3000-Series Switch
  89
- Call Processor
  90
- System and Subscriber Manager
  90
Standard Group Calls

90
Wide Area Group Calls

90
Special Calls

91
- General
  91
- Auxiliary Calls
  91
- Telephone Calls
  91
- Data Calls
  91
Home Channel Backup

91
- Introduction
  91
- Home Repeaters
  92
- Status Repeaters
  92
- Home Channel Aliasing
  92
Other Ltr-Net Features

92
- Unique ID Codes
  92
- Electronic Serial Number (ESN)
  93
- ESN and Unique ID Requests
  93
- Interrogate
  93
- Kill and Sleep
  93
- Auto-Registration and De-Registration
  93
- New Channel Updates
  94
Parts List

95
- Complete Assemblies
  95
- Flexible Cable Assembly
  95
- Keypad/Display Board Assembly
  95
- RF Board Assembly
  96
- Logic Board Assembly
  101
- Mechanical Parts
  105
Schematic Diagrams and Component Layouts

107
- Interconnect Schematic
  107
- Transceiver-To-RPI Programming Cable
  107
- RF Board Schematic
  108
- RF Board Top View
  109
- RF Board Bottom View
  109
- Logic Board Schematic
  110
- Logic Board Top View
  111
- Logic Board Bottom View
  111
- Display/Keypad Board Schematic
  112
- Display
  113
  - Flex Circuit Layout
    113
  - Transceiver Block Diagram
    114

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