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
+9.5VDC
+9.5V OUTPUT
MIC PTT
MIC AUDIO
FRONT PANEL
MIC AUDIO
BALANCED INPUT
SIDE 1
BALANCED INPUT
SIDE 2
CONTROLLER
BOARD
NORM
KEY TX
SW1
KEY TX
P1
Z18
Z4
P1
EXT MIC
+9.5 VDC
Z6
B6
R
FRONT PANEL
N CONNECTO
RF IN
RF OUT
+9.5V +13.8V
AMPLIFIER MODULE
RF BOARD
RF OUT
OR
B18
P1
TX LED
POWER LED
KEY LOAD*
LH_DATA
SB9600_BUSY
____
ENA
+9.5 VDC +13.8 VDC
+13.8 VDC
Z2
B2
TO ALL +13.8 V SUPPLY POINTS
MIC CONNECTOR
RJ45 CONNECTOR
J3
AUDIO SUMMING
AMPLIFIER
KEY FAIL*
OPTB+/VPP
CTSOUT*
SB9600_BUSY
LH_DATA
ENABLE
B24
P1
PTT OUT
KEY LOAD*
KEY FAIL*
OPTB+/VPP
CTSOUT*
B18
P1
PTT WTO
EXT PTT*
PROG SWITCH
EMERG
A/B
A0
A1
A2
A3
B22
P1
TX ENC*
D14
P1
CLEAR KEYS 1*(I/P)
B12
P1
TX BANK A*/B
D20
P1
TX CSEL0
D22
P1
TX CSEL1
D24
P1
TX CSEL2
Z12
P1
D16
P1
CLEAR KEYS 2*(I/P)
D26
P1
TX CSEL3
+5.0 V OUT+5.0 VDC
CONTROLLER / RF BOARDS
INTERFACE BUS
CONTROLLER / RF BOARDS
INTERFACE BUS
20
+9.5V
+9.5 VDC
68K1
1K0
P25 Digital Base Transmitter Instruction Manual
3.3 Digital Base Transmitter Block Diagram
3-3
xT4DBM3
ELECTRONICS
DANIELS