User Manual
Table Of Contents
- 1GENERAL
- 1.1Introduction
- 1.2Interim Operation
- 1.3Manual Organization
- 1.4UT-4R400 Transmitter Family Models
- 1.5Performance Specifications
- 1.5.1General
- 1.5.2Audio Specifications
- 1.5.3Physical Specifications
- 2THEORY OF OPERATION
- 2.1General
- 2.2Power Supply
- 2.3High Speed Serial Interconnect
- 2.4Audio Circuits
- 2.5PTT Circuitry
- 2.6Microprocessor Board
- 2.7Channel and Bank Selection
- 2.7.1Channel Select Line Mapping
- 2.8Jumper Functions and standard configuration
- 2.9Hang Timer Selection
- 2.10Kerchunk noise selection
- 2.11Test Points
- 2.12Connector Pinouts
- 2.12.1Connector J9
- 2.12.2Connector P1
- 2.13Transmitter Programming
- 2.13.1Transmitter Wide Options
- 2.13.1.1Frequency Band
- 2.13.1.2Source ID
- 2.13.1.3Secure Hardware Equipped
- 2.13.1.4Timeout Options
- 2.13.2Channel Wide Settings
- 2.13.2.1Channel Name
- 2.13.2.2Frequency
- 2.13.2.3Analog Bandwidth
- 2.13.2.4Deviation
- 2.13.2.5Channel Type
- 2.13.2.6Audio Pre-emphasis
- 2.13.2.7Timeout Value
- 2.13.2.8Project 25 Squelch Settings: Network Access Code (NAC)
- 2.13.2.9Project 25 Squelch Settings: Talk Group ID (TGID)
- 2.13.2.10Analog Signaling Settings: Signaling
- 2.13.2.11Analog Signaling Settings: CTCSS Tone
- 2.13.2.12Analog Signaling Settings: Reverse Burst
- 2.13.2.13Analog Signaling Settings: DCS Code
- 2.13.2.14Analog Signaling Settings: Turnoff Code
- 2.13.2.15Analog Squelch Settings: Invert DCS
- 3Transmitter Assembly and Adjustment
- 3.1Frequency Change
- 3.2Minor Frequency Change
- 3.3Major Frequency Change
- 3.4Digital Signal Processor Board Alignment
- 3.4.1Radio Service Software
- 3.4.2Radio Programming Interface Module Interconnection
- 3.4.3Reference Oscillator Adjustment
- 3.4.4Transmitter Deviation Balance Adjustment
- 3.4.5Transmitter Deviation Limit Adjustment
- 3.4.6Audio Level Alignment
- 3.4.7Amplifier Alignment
- 3.5Recommended Test Equipment List
- 3.6Repair Note
- 3.7Printed Circuit board Numbering Convention
- 4Repeater System Configuration
- 4.1Interim Repeater
- 4.1.1Repeater Interconnect Cable Pinout
- 4.2Project 25 Compliant Repeater
- 4.3Repeater System Troubleshooting
- 5ILLUSTRATIONS
- 5.1Digital Repeater Transmitter Front Panel
- 5.2Digital Repeater Transmitter Exploded View
- 5.3Digital Repeater Transmitter Block Diagram (Interim Mode)
- 5.4Digital Repeater Transmitter Schematic Diagram
- 5.5Digital Repeater Transmitter Main Board Component Layout (Bottom)
- 5.6Digital Repeater Transmitter Main Board Component Layout (Top)
- 5.7Digital Repeater Microprocessor Board Component Layout (Bottom)
- 5.8Digital Repeater Microprocessor Board Component Layout (Top)
- 6PARTS LIST
- 6.1Digital Repeater Transmitter Main Board Parts List
- 6.1.1Digital Repeater Transmitter Main Board Electrical Parts List
- 6.1.2Digital Repeater Transmitter Main Board Mechanical Parts List
- 6.2Digital Repeater Microprocessor Board Parts List
- 6.2.1Digital Repeater Microprocessor Board Electrical Parts List
- 6.2.2Digital Transmitter Additional PCBs
- 7REVISION HISTORY
DE
DANIELS
ELECTRONICS
3-4 UT-4R400 UHF Project 25
Digital
Transmitter
Instruction
Manual
signal
generated
by the transmitter. Key the
transmitter
by moving the front panel power switch to
the
“KEY”
position and adjust pot R11 to
achieve
a
deviation
of 3 kHz (for a 25 kHz wide
channel)
or 1.5 kHz (for a 12.5 kHz wide channel).
Next, de-key the
transmitter
and remove the audio signal generator. Connect the signal
generator
to
microphone
connector
MIC1-2. Key the
transmitter
by moving the front panel power switch to
the
“KEY”
position.
Adjust
pot R9 to
achieve
a
deviation
of 3 kHz kHz (for a 25 kHz wide
channel)
or 1.5 kHz (for a 12.5 kHz wide channel). This
completes
the audio
level
alignment
procedure.
3.4.7
Amplifier
Alignment
The RF power output of the
amplifier
is set to its rated value of 2.0 Watts or 8.0 Watts at the
factory. This should not require
adjustment
under normal circumstances.
However,
should it be
necessary to
correct
the output
power,
the 'Output Power Adjustment’, which is described in the
Amplifier
Manual, can be adjusted accordingly. Power
adjustment
may also be required when the
transmitter's
operating
frequency is changed. When a large frequency change has been
programmed
into the transmitter, the
amplifier
should be
aligned
at the new frequency
according
to
the
Amplifier
Manual.
3.5 Recommended
Test
Equipment List
Alignment
of the
transmitter
requires the following test
equipment
or its equivalent.
Dual
Power Supply:
Regulated
+9.5
Vdc at 2 A.
Regulated
+13.8
Vdc at 2 A - Topward TPS-4000
Oscillo
scope /
Multimeter:
Fluke 97
Scopemeter
Current
Meter:
Fluke 75
multimeter
Radio
communications
test set:
Marconi
Instruments 2955R (analog only)
Motorola
R2670 with Project 25 option
Alignment
Tool:
Johanson 4192
It is
recommended
that the radio
communications
test set be frequency locked to an
external
reference
(WWVH,
GPS,
Loran C) so that the high
stability
oscillator
may be
accurately
set to
within its ±1 ppm frequency tolerance.
3.6 Repair
Note
The
transmitter
is
mainly
made up of surface mount devices, which should not be removed or
replaced
using an ordinary soldering iron.
Removal
and
replacement
of surface mount
components should be performed only with
specifically
designed surface mount rework and repair
stations
complete
with
Elect
roStatic
Discharge
(ESD) protection.
When removing Surface
Mount
Solder
Jumpers,
it is
recommended
to use solder braid in
place
of
manual
vacuum type desoldering tools when removing jumpers. This will help prevent
damage
to
the
circuit
boards.