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
2-4 UT-4B400 P25 Di
gital
UHF Base
Transmitter
Instruction
Manual
2.2.2.7
DCS Invert
This option allows the DCS code to have its phase inverted by 180 degrees, which is used to
compensate for phase inversions introduced in the signal path.
2.2.2.8
Enable Turn Off Code
This option enables a DCS Turn Off Code to be sent at the end of a transmission. The Turn Off
Code signals to the receiving radio that the transmission is ending, allowing it to mute more
quickly.
2.2.2.9 Transmitter Power
This option is not currently used.
2.2.2.10
Channel Bandwidth
This setting should be changed to match the channel spacing and bandwidth of the operating
channel. Both 25 kHz and 12.5 kHz are supported for Analog channels, while Project 25
channels are limited to 12.5 kHz.
2.2.2.11
Deviation
This is a read-only field that shows the maximum amount that the transmitter frequency will
deviate. This field changes automatically in response to the Channel Bandwidth setting. A
bandwidth of 25 kHz selects a maximum deviation of 5 kHz, while a bandwidth of 12.5 kHz
selects a maximum deviation of 2.5 kHz.
2.2.2.12
Time Out Timer
This option enables the operation of a Time Out Timer that disables the transmitter output after a
predetermined period of use. If the option is enabled, a further box becomes visible to allow the
user to set the desired time into the timer.
2.2.2.13
Channel Status
This option is not currently used.
2.2.2.14
Transmitter Pre-emphasis
For analog channels, the standard 6 dB/octave pre-emphasis curve may be either disabled or
applied to the transmitted audio