User Manual
Table Of Contents
- 1GENERAL
- 1.1Introduction
- 1.2Interim Operation
- 1.3Manual Organization
- 1.4VT-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
2-4 VT-4R150 VHF Project 25
Digital
Transmitter
Instruction
Manual
JU24 Out Connects fr pnl MIC
MODE
switch
directly
to
Digital
Signal Processor board
JU25 Out Connects summed PTT signals
directly
to
Digital
Signal Processor board
JU26 In Connects
channel
select
line CSEL3 to
Digital
Signal Processor board
JU27 Out Connects
Digital
Signal Processor board to green front panel
LED
JU28 Out Grounds
Digital
Signal Processor board bank
select
input
JU29 Out Connects Bank
Select
input to
directly
to the
Digital
Signal Processor board
JU30 In Connects
channel
select
line CSEL0 to
Digital
Signal Processor board
JU31 In Connects
channel
select
line CSEL1 to
Digital
Signal Processor board
JU32 In Connects
channel
select
line CSEL2 to
Digital
Signal Processor board
JU33 A Connects 68HC11 uP to yellow front panel
LED
JU34 In Enables yellow front panel
LED
JU35 In Enables green front panel
LED
JU36 In Enables yellow front panel
LED
JU37 In Connects TX PTT OUT* signal to subrack
JU38 Out Allows bootstrap
programming
of 68HC11 uP
JU39 Out Allows
programming
of
EPROM
version of 68HC11 uP
JU40 Out Provides serial
communications
for bootstrap pr
ogramming
JU41 In Allows 68HC11 uP to control green front panel
LED
JU42 In Allows 68HC11 uP to control yellow front panel
LED
JU43 In Bit 3 (MSB) of hang
time
select
JU44 In Bit 2 of hang
time
select
JU45 In Bit 1 of hang
time
select
JU46 In Bit 0 (LSB) of hang
time
select
JU47 Out
Disables
“kerchunk” noise at the end of a transmission
JU48 Out No function
JU49 Out No function
JU50 Out No function
2.9 Hang
Timer
Selection
Hang
time
is a
selectable
time
delay, which can be
enabled
to keep the tra
nsmitter
keyed after its
PTT input is released. It can be used to keep a RF
channel
open in low signal
conditions
when the
receiver
might
be squelching
intermittently.
It is also
commonly
used by
repeater
users in order to
keep the
transmitter
keyed long enough to key their
mobile
radios briefly at the end of their
transmission in order to be sure that they’ve hit the repeater. The duration of the hang
timer
is
selectable
in 250 ms.
increments
from 0 (disabled) to 3.75 sec by changing the states of jumpers
JU43-46.
A
table
of the hang
timer
durations is shown below. Note that the Hang
Time
is
applied
only when the radio is keyed by the
ANALOG_COR*
or
DIGITAL_COR*
inputs, not from the
front panel
Mic
connector
or the PTT signal from the M-3 subrack.
JU46 JU45 JU44 JU43 Hang
Time
IN IN IN IN 0 (disabled)
IN IN IN OUT 250 ms
IN IN OUT IN 500 ms
IN IN OUT OUT 750 ms
IN OUT IN IN 1 sec
IN OUT IN OUT 1.25 sec
IN OUT OUT IN 1.5 sec
IN OUT OUT OUT 1.75 sec
OUT IN IN IN 2 sec