User Manual
Table Of Contents
- 1GENERAL
- 1.1Introduction
- 1.2Manual Organization
- 1.3UT-4B 406 - 470 MHz Transmitter Family Models
- 1.4Performance Specifications
- 1.4.1General
- 1.4.2Audio Specifications
- 1.4.3Physical Specifications
- 2THEORY OF OPERATION
- 2.1Transmitter Operation
- 2.2Transmitter Programming
- 2.2.1Transmitter Wide Options
- 2.2.1.1Disable Front Panel Led
- 2.2.1.2Secure Hardware Equipped
- 2.2.1.3Allow Emergency Transmissions
- 2.2.1.4Allow Radio Inhibit
- 2.2.1.5Allow Radio Check
- 2.2.1.6Enable Status
- 2.2.1.7Frequency Band
- 2.2.2Channel Wide Settings
- 2.2.2.1Frequency
- 2.2.2.2Voice/Signal Type
- 2.2.2.3Squelch Type
- 2.2.2.4CTCSS Tone
- 2.2.2.5Enable Reverse Burst
- 2.2.2.6DCS Code
- 2.2.2.7DCS Invert
- 2.2.2.8Enable Turn Off Code
- 2.2.2.9Transmitter Power
- 2.2.2.10Channel Bandwidth
- 2.2.2.11Deviation
- 2.2.2.12Time Out Timer
- 2.2.2.13Channel Status
- 2.2.2.14Transmitter Pre-emphasis
- 2.2.2.15NAC Transmitter Code
- 2.2.2.16NAC Transmitter
- 2.3Transmitter Programming using Motorola Radio Service Software
- 2.4Secure Communications
- 2.5Transmitter Assembly and Adjustment
- 2.5.1Controller Board Alignment
- 2.5.1.1Reference Oscillator Adjustment
- 2.5.1.2Transmitter Deviation Balance Adjustment
- 2.5.1.3Transmitter Deviation Limit Adjustment
- 2.5.2Amplifier Alignment
- 2.5.3Frequency Change
- 2.6Recommended Test Equipment List
- 2.7Repair Note
- 2.8Printed Circuitboard Numbering Convention
- 3ILLUSTRATIONS
- 3.1Digital Base Transmitter Front Panel
- 3.2Digital Base Transmitter Case - Exploded View
- 3.3Digital Base Transmitter Block Diagram
- 3.4Digital Base Transmitter Schematic Diagram
- 3.5Digital Base Transmitter Main Board Component Layout (Bottom)
- 3.6Digital Base Transmitter Main Board Component Layout (Top)
- 4PARTS LIST
- 4.1Base Transmitter Main Board Parts List
- 4.1.1Base Transmitter Main Board Electrical Parts List
- 4.1.2P25 Base Transmitter Mechanical Parts List
- 5REVISION HISTORY
DE
DANIELS
ELECTRONICS
2-2 UT-4B400 P25 Di
gital
UHF Base
Transmitter
Instruction
Manual
2.2.1
Transmitter Wide Options
Several options may be set which affect the operation of the Transmitter on a global basis.
2.2.1.1
Disable Front Panel Led
This option is not currently used. In future models it will allow the front panel led to be disabled
during normal repeater operation in order to save current.
2.2.1.2
Secure Hardware Equipped
This setting is used to allow the installation of an encryption module
2.2.1.3
Allow Emergency Transmissions
This option is not currently used.
2.2.1.4 Allow Radio Inhibit
This setting is not currently used.
2.2.1.5 Allow Radio Check
This option is not currently used. In future repeaters, this option will allow a dispatcher to query
whether the repeater is switched on or off.
2.2.1.6
Enable Status
This option is not currently used. When the option is enabled it will allow the transmitter to
transmit predetermined Status messages ("low battery", "intruder alert", for example). The Status
messages will not take precedence over user traffic.
2.2.1.7 Frequency Band
The transmitter’s frequency band is set here. The available options are 132 – 174 MHz and 406 –
470 MHz. The band from 803 – 870 MHz will become available in future models.