Daniels UT-4B420-00-000 User manual

MT-4 RADIO SYSTEMS
P25 DIGITAL UHF BASE
TRANSMITTER
INSTRUCTION MANUAL
UT-4B 406 - 470 MHz
Covers models:
UT-4B420-00-000, UT-4B460-00-000
UT-4B420-01-000, UT-4B460-01-000
Copyright ©1999 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 United States Patent and
Trademark Office.
Issue: Preliminary Previous Issue: -
Issue Date: May99 Previous Issue Date: - Daniels Electronics Ltd.
Printing Date: May99 Victoria , BC.
Part No.: IM23-UT4B400 PRINTED IN CANADA

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ii UT-4B400 P25 Di gital UHF Base Transmitter Instruction Manual
Reviewed By:
Quality Assurance:
Larry Freeman _________________
Name Signature Date
NOTE:
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.

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UT-4B400 P25 Digital UHF Base Transmitter Instruction Manual iii
TABLE OF CONTENTS
1 GENERAL..................................................................................... 1-1
1.1 Introduction .............................................................................. 1-1
1.2 Manual Organization .................................................................... 1-1
1.3 UT-4B 406 - 470 MHz Transmitter Family Models................................ 1-1
1.4 Performance Specifications ............................................................ 1-2
1.4.1 General................................................................................ 1-2
1.4.2 Audio Specifications ................................................................. 1-4
1.4.3 Physical Specifications .............................................................. 1-4
2 THEORY OF OPERAT ION................................................................. 2-1
2.1 Transmitter Operation ................................................................... 2-1
2.2 Transmitter Programming.............................................................. 2-1
2.2.1 Transmitter Wide Options ........................................................... 2-2
2.2.1.1 Disable FrontPanelLed.......................................................... 2-2
2.2.1.2 SecureHardwareEquipped...................................................... 2-2
2.2.1.3 Allow Emergency Transmissions............................................... 2-2
2.2.1.4 AllowRadio Inhibit ............................................................... 2-2
2.2.1.5 AllowRadioCheck............................................................... 2-2
2.2.1.6 Enable Status...................................................................... 2-2
2.2.1.7 FrequencyBand................................................................... 2-2
2.2.2 ChannelWideSettings.............................................................. 2-3
2.2.2.1 Frequency.......................................................................... 2-3
2.2.2.2 Voice/Signal Type................................................................. 2-3
2.2.2.3 SquelchType...................................................................... 2-3
2.2.2.4 CTCSS Tone...................................................................... 2-3
2.2.2.5 Enable ReverseBurst............................................................. 2-3
2.2.2.6 DCSCode.......................................................................... 2-3
2.2.2.7 DCSInvert......................................................................... 2-4
2.2.2.8 Enable TurnOffCode............................................................ 2-4
2.2.2.9 Transmitter Power ................................................................ 2-4
2.2.2.10 ChannelBandwidth............................................................. 2-4
2.2.2.11 Deviation .......................................................................... 2-4
2.2.2.12 Time Out Timer .................................................................. 2-4
2.2.2.13 ChannelStatus................................................................... 2-4
2.2.2.14 Transmitter Pre-emphasis....................................................... 2-4
2.2.2.15 NAC Transmitter Code......................................................... 2-5
2.2.2.16 NAC Transmitter ................................................................ 2-5
2.3 Transmitter Programmingusing Motorola Radio ServiceSoftware .............. 2-5
2.4 Secure Communications ................................................................ 2-6
2.5 Transmitter Assemblyand Adjustment ............................................... 2-6
2.5.1 Controller Board Alignment ........................................................ 2-6
2.5.1.1 Reference Oscillator Adjustment ................................................ 2-7

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iv UT-4B400 P25 Di gital UHF Base Transmitter Instruction Manual
2.5.1.2 Transmitter Deviation Balance Adjustment .....................................2-7
2.5.1.3 Transmitter Deviation Limit Adjustment ........................................2-7
2.5.2 Amplifier Alignment ..................................................................2-9
2.5.3 FrequencyChange....................................................................2-9
2.6 Recommended Test Equipment List................................................. 2-10
2.7 RepairNote............................................................................. 2-10
2.8 Printed Circuitboard Numbering Convention ...................................... 2-10
3 ILLUSTRATIONS ............................................................................3-1
3.1 Digital Base Transmitter FrontPanel..................................................3-1
3.2 Digital Base Transmitter Case-ExplodedView.....................................3-2
3.3 Digital Base Transmitter Block Diagram ..............................................3-3
3.4 Digital Base Transmitter Schematic Diagram .........................................3-4
3.5 Digital Base Transmitter Main Board Component Layout (Bottom) ...............3-5
3.6 Digital Base Transmitter Main Board Component Layout(Top)...................3-6
4 PARTSLIST...................................................................................4-1
4.1 Base Transmitter Main BoardPartsList..............................................4-1
4.1.1 Base Transmitter Main Board Electrical PartsList................................4-1
4.1.2 P25 Base Transmitter Mechanica lPartsList......................................4-3
5 REVISION HISTORY ........................................................................5-1
MODULE MANUALS
UHF Amplifier Instruction Manual UT-3 406 - 470 MHz ........... IM23-UT3400AMP

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UT-4B400 P25 Digital UHF Base Transmitter Instruction Manual 1-1
1 GENERAL
1.1 Introduction
The UT-4B P25 Digital Base Transmitter is capable of operating in 12.5 kHz / 15 kHz or 25 kHz /
30 kHz channels. The transmitter operates continuous duty in the 406 to 470 MHz frequency band
and its output power is continuously adjustable from 2.0 to 8.0 Watts. A modular design allows
each of the transmitter's modules: Transmitter Main Board, UT-3/400 Amplifier to be individually
assembled and tested. This facilitates construction, tuning, maintenance as well as troubleshooting
procedures. The module can support DES-OFB decryption with a plug in module.
The UT-4B Transmitter combines state of the art performance in a compact modular enclosure for
applications ranging from remote mountain top repeaters to congested urban radio environments.
Each receiver module is characterized by dependable, low maintenance performance under the
most severe environmental conditions.
The UT-4B Transmitter is compatible with all Daniel’s subrack and base station enclosures. It
supports a basic analog interface, and may be used in a mixed system with MT-2 and MT-3 series
receivers and transmitters. It is not intended for use as a component in a digital mode repeater
system.
1.2 Manual Organization
The organization of this manual reflects the modular makeup of the UT-4 product line. Each
module is fully described within its respective submanual, all of which are contained within this
document. In general, each submanual contains:
1. A functional description and specification summary,
2. A detailed technical description (Theory of Operation) and
3. Assembly, setup an d alignment procedures relevant to that particular module.
The module manuals are as follows.
Note: material presented in a given "sub-manual" may include information related to other module
versions not directly applicable to the UT-4 406 - 470 MHz Transmitter.
UHF Amplifier Instruction Manual UT-3 406 - 470 MHz: The amplifier module provides the final
stages of RF power amplification and harmonic filtering for the transmitter. This manual is
intended primarily as a reference since the amplifier module is adjusted at the factory.
1.3 UT-4B 406 - 470 MHz Transmitter Family Models
There are 2 distinct models in the UT-4B Transmitter family each with different bands of
operation. The 2 models are as follows:
• UT-4B420-00-000 - 406-430 MHz band, 2.0-8.0 W att
• UT-4B460-00-000 - 450-470 MHz band, 2.0-8.0 Watt
The transmitters' band of operation is determined by select components in the amplifier.

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1-2 UT-4B400 P25 Di gital UHF Base Transmitter Instruction Manual
1.4 Performance Specifications
1.4.1 General
The following is a general set of specifications for the generic UT-4B400 transmitter. Additional
specifications, specific to individual modules may be found in their respective sub manuals.
Type: MT-4 Series Transmitter.
Family: UT-4B 406 - 470 MHz.
Compatibility: MT-2 Series and MT-3 Series Radio Systems, Project 25
interoperable.
Frequency Range: 406 to 430 MHz., 450 to 470 MHz
RF Power Output: 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: -66 dBw
Transmitter Mismatch Protection: 20:1 VSWR at all phase angles.
Operating Temperature Range: -30˚C to +60˚C, optional -40˚C temperature test.
Operating Humidity: 95% RH (non-condensing) at +25°C.
Operating Voltage: +13.8 Vdc Nominal (range +11 to +16 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: N ORM (repeat mode), OFF, and KEY TX (Tx on).
PTT Activation: • Active to ground;
• Microphone activated;
• Front Panel switch: KEY TX;
PTT Time-Out-Timer: Programmable from 1 sec. to 8 hrs. (default 5 min.), using
Radio Programming Software package.
Channel Spacing: 12.5 kHz /15 kHz or 25 kHz / 30 kHz.

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UT-4B400 P25 Digital UHF Base Transmitter Instruction Manual 1-3
Frequency Stability: Standard: ±2.5 ppm, -30°C to +60°C. Optional: -40C to +
60C.
Channel Selection: In 5.0 or 6.25 kHz increments selected with Radio
Programming Software package.
Standby Current: 100 mA
DOC Type Approval: TBA
FCC Type Acceptance: TBA

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1-4 UT-4B400 P25 Di gital UHF Base Transmitter Instruction Manual
1.4.2 Audio Specifications
Audio Input: Unbalanced, 600 or 47k5 ohm selectable input impedance.
Audio Response: Pre-emphasis (6 dB per octave); +0.5 to -2.0 dB from 300 Hz
to 3 kHz;
Audio Deviation Limiting: +/- 2.5 kHz, +/- 5.0 kHz
Audio Distortion: Less than 3% THD; 1 kHz tone at 1.5 kHz or 3 kHz deviation
(-40°C to +60°C).
Hum and Noise: -45 dB typical
1.4.3 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: 1.5 kg (3.3 lbs.)
Corrosion Prevention: Anodized aluminum construction. Stainless steel hardware.
Selectively conformal coated glass epoxy 2 and 4 layer printed
circuit boards. Gold plated module connectors.
Module Design: Compac t 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 connecto r 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
SO2 gas test with no functional impairment and no change in
contact resistance). Digital I/O: 8-pin RJ-45
Handle Text Colour: Black

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UT-4B400 P25 Digital UHF Base Transmitter Instruction Manual 2-1
2 THEORY OF OPERATION
2.1 Transmitter Operation
An UT-4B Base Transmitter is constructed using two primary modules: the MT-4 Digital Base
Transmitter Main Board and the UT -4 Amplifier Board. The Main Board supports two plug in
modules: the Transmitter Controller Board and the Transmitter RF Board.
The MT-4 Digital Base Transmitter Main Board receives its audio input through the balanced input
on connector P1, from an external microphone input on connector P1, or from a front panel
microphone. Once on the Main Board, it is immediately digitized using an Analog to Digital
converter.
The digitized signal then passes to the Controller Board, where Digital Signal Processing
techniques are used for volume control, tone signalling, voice compression, filtering, and other
functions. The digital data is then converted to an analog waveform by a Digital to Analog
Converter and passed to the RF board.
On the RF board the signal is used to modulate a RF carrier and then passed to the UT-3 Amplifier
Board for final amplification and transmission.
2.2 Transmitter Programming
The transmitter is programmed with operating frequencies, modulation type, CTCSS and DCS
signalling, and other parameters with the PC-based Radio Programming Software. A special
programming cable is used to connect the serial port of an IBM compatible computer to the Digital
I/O port on the front panel of the Transmitter module. The Radio Programming Software runs
under Window 3.1, Windows 95/98 or Windows NT. Analog test modes may be selected by the
Radio Programming Software, as well as test modes specific to Project 25 digital operation, such
as Bit Error Rate testing.
*** Note that the current version of Radio Programming Software is a demonstration version
only, and cannot be used to program a Transmitter. To program a Transmitter, use Motorola’s
Radio Service Software (RSS), a Motorola Radio Interface Box (RIB), and a Daniels
Programming Cable.
The Transmitter settings are divided into two categories: Transmitter Wide options and Channel
Wide options. When the TX menu is selected from the main screen, both the Transmitter Wide
options and the Channel Wide options for the current channel are displayed. When all Transmitter
Wide and Channel Wide options have been configured in the Radio Programming Software as
required, the radio must have its non-volatile memory updated. The configuration may be saved to
the radio by selecting the TRANSMITTER \ SAVE CONFIGURATION \ TO THE RADIO menu
option. In addition, configurations may be read back from the radio, or saved and read from a file
on the computer by using the TRANSMITTER \ READ CONFIGURATION \ FROM THE
RADIO, TRANSMITTER \ READ CONFIGURATION \ FROM DISK, and TRANSMITTER \
SAVE CONFIGURATION \ TO DISK menu options.

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2.2.1 Transmitter Wide Options
Several options may be set which affect the operation of the Transmitter on a global basis.
2.2.1.1 Disable Front Panel Led
This option is not currently used. In future models it will allow the front panel led to be disabled
during normal repeater operation in order to save current.
2.2.1.2 Secure Hardware Equipped
This setting is used to allow the installation of an encryption module
2.2.1.3 Allow Emergency Transmissions
This option is not currently used.
2.2.1.4 Allow Radio Inhibit
This setting is not currently used.
2.2.1.5 Allow Radio Check
This option is not currently used. In future repeaters, this option will allow a dispatcher to query
whether the repeater is switched on or off.
2.2.1.6 Enable Status
This option is not currently used. When the option is enabled it will allow the transmitter to
transmit predetermined Status messages ("low battery", "intruder alert", for example). The Status
messages will not take precedence over user traffic.
2.2.1.7 Frequency Band
The transmitter’s frequency band is set here. The available options are 132 – 174 MHz and 406 –
470 MHz. The band from 803 – 870 MHz will become available in future models.