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
UT-4R400 UHF Project 25
Digital
Transmitter
Instruction
Manual
2-9
2.13.2.6 Audio
Pre-emphasis
For analog channels, the standard 6
dB/octave
pre-emphasis curve may be
either
disabled or
applied
to the
transmit
ted audio. Pre-emphasis is
applied
to audio from the
Unbalanced
Audio
Input, the
microphone
input, and the audio input on the CNTL BUS jack on the front panel.
2.13.2.7
Timeout
Value
This option allows
selection
of one of four preset
timeout
timer
values. Each of the four preset
values is set in the
Transmitter
Wide Settings panel, in the section
called
Timeout
Options. If the
transmitter
is keyed
continuously
for longer than the
selected
time, it will be de-keyed. To reset
the
timeout
timer, the
applied
PTT* signal or
ANALOG_COR*
or
DIGITAL
_COR* signal must
be removed for a period at least as long as the hang time.
2.13.2.8 Project 25
Squelch
Settings:
Network Access Code (NAC)
For P25 channels, the
transmitted
Network Access Code can be set here. The Network Access
Code (NAC) is a 12 bit field
embedded
within every P25 voice call.
NACs are
primarily
used for two purposes:
1) They allow a large system
coverage
area to be serviced by
separate
repeaters.
2) They allow
multiple
repeaters
to service
multiple
systems with
overlapping
coverage
areas.
NACs
achieve
these functions by
minimizing
co-channel
interference.
This is done by
keeping the
receiver
squelched unless a signal with a
matching
NAC arrives.
The
NAC's
12 bit field ranges from 0 to 4095
(hexadecimal
$0 to
$FFF).
The
default
value is
$293 and two values are defined for
special
functions.
1) When a
receiver
is set for NAC $F7E, it unsquelches on any
incoming
NAC.
2) If a
repeater receiver
is set for NAC
$F7F,
it also unsquelches on any
incoming
NAC.
When the P25
Compliant
repeater
is released, $F7F allows the
repeater
to
repeat
any
incoming
NAC.
2.13.2.9 Project 25
Squelch
Settings:
Talk
Group
ID (TGID)
The
transmitter’s
Talk Group ID can be set here. This applies to Project 25 signals only
The Talk Group Ide
ntifier
(TGID) is a 16 bit field
embedded
within every P25 voice call. The
purpose of a Talkgroup is to allow
logical
groupings of radio users into
distinct
organizations.
The
TGID's
16 bit field ranges from 0 to 65,535
(hexadecimal
$0 to
$FFFF).
Three of these
values are set up for
special
functions.
1) The
default
value of $1 should be used in systems where no other talkgroups are defined.
2) A value of $0 corresponds to "no-one" or a talk group with no
users.
3) A value of
$FFFF
is reserved as a talk group which includes everyone.
2.13.2.10 Analog
Signaling
Settings:
Signaling
This
setting
may be set to No Tone, CTCSS or DCS. When
either
CTCSS or DCS Squelch Type
is selected,
additional
combo boxes appear to allow
selection
of a
particular
tone or code.