Daniels VT-4D140-R0-000 User manual

P25 DIGITAL VHF
TRANSMITTER
INSTRUCTION MANUAL
VT-4D 136-174 MHZ
Covers Models:
VT-4D140-R0-000 VT-4D160-R0-000
Copyright ©2003 Daniels Electronics Ltd. All rights reserved. No
part of this publication may be reproduced, stored in a retrieval system
or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording or otherwise, without the prior written consent
of Daniels Electronics Ltd.
DE™ is a registered trademark of Daniels Electronic Ltd. registered in
the U.S. Patent and Trademark Office.
Document Number:
Revision:
Revision Date:
IM21-001
1-0-0
Aug 2003
Daniels Electronics Ltd.
Victoria, BC
PRINTED IN CANADA
Module Manuals Included:
IM21-VT3150AMP

P25 Digital VHF Transmitter Instruction Manual
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This document has been produced, verified and
controlled in accordance with Daniels Electronics’
Quality Management System requirements.
Please report any errors or problems to Daniels
Electronics’ Customer Service Department.
The user’s authority to operate this equipment could
be revoked through any changes or modifications not
expressly approved by Daniels Electronics Ltd.
The design of this equipment is subject to change
due to continuous development. This equipment may
incorporate minor changes in detail from the information
contained in this manual.
DOCUMENT CONTROL
NOTE

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Contents
General Information ...............................................................1
Introduction ................................................................................................1
Performance Specifications .......................................................................2
Theory of Operation ...............................................................5
General ......................................................................................................5
Jumper Functions and Standard Configuration ........................................7
Test Points .................................................................................................8
Transmitter Programming ........................................................................ 10
Transmitter Assembly and Adjustment................................. 13
Repair Note.............................................................................................. 13
Recommended Test Equipment List ........................................................ 14
Transmitter Assembly and Adjustment..................................................... 14
Frequency Change .................................................................................. 14
Digital Signal Processor Board Alignment ............................................... 15
Repeater System Configuration........................................... 19
Digital Repeater ....................................................................................... 19
Repeater System Troubleshooting........................................................... 20
Illustrations and Schematics ................................................ 23
P25 Digital Transmitter Front Panel ......................................................... 24
P25 Digital Transmitter Block Diagram .................................................... 25
P25 Digital Transmitter Main Board Component Layout - Bottom ........... 26
P25 Digital Transmitter Main Board Component Layout - Top................. 27
P25 Digital Transmitter Schematic Diagram ............................................ 28
P25 Adapter Board Component Layout ................................................... 29
P25 Adapter Board Schematic Diagram .................................................. 29
Parts Lists ............................................................................ 31
P25 Digital Transmitter Electrical Parts List ............................................. 31
P25 Digital Transmitter Mechanical Parts List ......................................... 34
P25 Adapter Board Parts List................................................................... 35
Revision History ................................................................... 37

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Manual Organization
The organization of this document reflects the
modular construction of the VT-4D family of
products. Each product is fully described within
its respective “sub-manual”; all of which are
contained within this document. In general, each
of these sub-manuals contain:
1. A functional description and specification
summary.
2. A detailed technical description (Theory of
Operation).
3. Assembly, setup and alignment procedures
relevant to the particular module.
The following sub-manual is contained within
this modular manual.
VHF Amplifier Instruction Manual: This
manual provides information on alignment
and operation of the 2 and 8 Watt RF amplifier
modules.
The following manual is also required for
alignment of the VT-4D family transmitter.
Radio Service Software Manual: This manual
provides instructions on using the PC-based
Radio Service Software package to perform
Transmitter alignment and frequency and mode
selection. This manual is available as a PDF
file on CD that is supplied in the Radio Service
Software and Interface Kit.
GENERAL
INFORMATION

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General Information
2
VT-4D150 Transmitter Family Models
There are four distinct models in the VT-4D150 Transmitter family each with different bands of
operation and power outputs. The four models are as follows:
• VT-4D140-2 136-150 MHz band, 0.5-2.0 Watt
• VT-4D140-8 136-150 MHz band, 2.0-8.0 Watt
• VT-4D160-2 150-174 MHz band, 0.5-2.0 Watt
• VT-4D160-8 150-174 MHz band, 2.0-8.0 Watt
The transmitters’ band of operation is determined by select components in the amplifier.
Performance Specifications
Blank line
General
The following is a general set of specifications for the generic VT-4D150 transmitter. Additional
specifications, specific to individual modules may be found in their respective sub manuals.
Type: MT-4D Series Transmitter.
Family: VT-4D150 136 - 174 MHz.
Compatibility: MT-2, MT-3 and MT-4 Series Radio Systems, P25 interoperable.
Frequency Range: 136 to 150 MHz., 150 to 174 MHz
RF Power Output: 0.5 to 2.0 or 2.0 to 8.0 W Continuous.
Modulation: Analog: 11K0F3E or 16K0F3E (Frequency Modulation).
Project 25: 8K10F1E
System Impedance: 50 Ω; Type N connector.
Duty Cycle: 100%; Continuous operation from -30°C to +60°C.
Emissions: -70 dBc
Transmitter Mismatch Protection: 20:1 VSWR at all phase angles.
Operating Temperature Range: -30˚C to +60˚C.
Operating Humidity: 95% RH (non-condensing) at +25°C.
Operating Voltage: +13.8 Vdc Nominal (range +10 to +17 Vdc),
+9.5 Vdc Regulated.
Transmit Current: 1.7 Amps at 2 Watts RF Power Output,
2.8 Amps at 8 Watts RF Power Output
Front Panel Controls: NORM (repeat mode), OFF, and KEY TX (Tx on).
MIC MODE: ANALOG and DIGITAL.

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General Information 3
PTT Activation: • Active to ground; Microphone activated;
• Front Panel switch: KEY TX
PTT Time-Out-Timer: Programmable from 1 sec. to 8 hrs or infinity. (Default 5 min.),
using Radio Service Software package.
Standby Current:
Transmitter with no Standby ≤75 mA
encryption modules installed
Transmitter with encryption Standby ≤105 mA
modules installed
DOC Type Approval: TBA
FCC Type Acceptance: TBA
Audio Specifications
Audio Input: Balanced, 600Ωor optional unbalanced input
(600 Ωor 15000Ωselectable input impedance)
Audio Response: Pre-emphasis (6 dB per octave); +1 to -3 dB
from 300 Hz to 3 kHz
Audio Deviation Limiting: +/- 2.5 kHz, +/- 5.0 kHz
Audio Distortion: < 3% THD; 1 kHz tone at 1.5 kHz or 3 kHz deviation
Hum and Noise: -34 dB typical

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Physical Specifications
Physical Dimensions: Width: Height: Depth:
7.1 cm (2.8 in) 12.8 cm (5.05 in) 19 cm (7.5 in)
Module Weight: 1.4 kg (3.0 lbs.)
Corrosion Prevention: Anodized aluminum construction. Stainless steel hardware.
Gold plated module connectors.
Module Design: Compact Eurostandard modular design. Plug-in modules
mate with Daniels standard M3 repeater subrack.
Subracks/modules comply with IEEE 1101, DIN 41494 and
IEC 297-3 (mechanical size / modular arrangement).
External Connections: RF Connection: type N connector located on the transmitter
module front panel. Motherboard Connections (Audio,
Power, and Control) are made through a 48 pin, gold
plated, type F connector on the rear of the transmitter
module. User connection made through mated “mother
board” assembly of the repeater subrack. Type F standard
connector complies with DIN 41612 Level 2 (200 mating
cycles, 4 day 10 ppm SO2gas test with no functional
impairment and no change in contact resistance). Digital
I/O: 8-pin RJ-45
Handle Text Colour: Red

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THEORY
OF OPERATION

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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 ElectroStatic
Discharge (ESD) protection.
When removing Surface Mount Solder Jumpers,
it is recommended to use solder braid in place of
manual vacuum type desoldering tools. This will
help prevent damage to the circuit boards.
TRANSMITTER
ASSEMBLY AND ADJUSTMENT

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REPEATER SYSTEM
CONFIGURATION