Codan Radio Communications VT 4D150 Users Guide

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.

Document Number:

Revision:

Revision Date:

DE™ is a registered trademark of Daniels Electronic Ltd. registered in
the U.S. Patent and Trademark Offi ce.

Module Manuals Included:
IM21-VT3150AMP

IM21-001
1-0-0
Aug 2003

Daniels Electronics Ltd.

Victoria, BC

PRINTED IN CANADA

ii

DOCUMENT CONTROL

This document has been produced, verifi ed and
controlled in accordance with Daniels Electronics’
Quality Management System requirements.

Please report any errors or problems to Daniels
Electronics’ Customer Service Department.

NOTE

The user’s authority to operate this equipment could
be revoked through any changes or modifi cations 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.

P25 Digital VHF Transmitter Instruction Manual
IM21-001

Contents

General Information ...............................................................1

Introduction ................................................................................................1

Performance Specifi cations .......................................................................2

Theory of Operation ...............................................................5

General ...................................................................................................... 5

Jumper Functions and Standard Confi guration ........................................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

iii

Repeater System Confi guration........................................... 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

P25 Digital VHF Transmitter Instruction Manual

IM21-001

Manual Organization

1

GENERAL

INFORMATION

The organization of this document refl ects 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 specifi cation
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 Amplifi er Instruction Manual: This
manual provides information on alignment
and operation of the 2 and 8 Watt RF amplifi er
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
fi le on CD that is supplied in the Radio Service
Software and Interface Kit.

P25 Digital VHF Transmitter Instruction Manual

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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 amplifi er.

Performance Specifi cations

Blank line

General

The following is a general set of specifi cations for the generic VT-4D150 transmitter. Additional
specifi cations, specifi c 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.

P25 Digital VHF Transmitter Instruction Manual
IM21-001

General Information

PTT Activation: • Active to ground; Microphone activated;

• Front Panel switch: KEY TX

PTT Time-Out-Timer: Programmable from 1 sec. to 8 hrs or infi nity. (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 Specifi cations

3

Audio Input: Balanced, 600Ω or optional unbalanced input

(600 Ω or 15000Ω selectable 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

P25 Digital VHF Transmitter Instruction Manual

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This Page Intentionally Left Blank

4

Physical Specifi cations

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 SO
impairment and no change in contact resistance). Digital
I/O: 8-pin RJ-45

2 gas test with no functional

Handle Text Colour: Red

P25 Digital VHF Transmitter Instruction Manual
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THEORY

OF OPERATION

5

P25 Digital VHF Transmitter Instruction Manual

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