Codan Radio Communications VT-4D150 VT-4D140 and VT-4D160 VHF Transmitters User Manual IM21 001 1 0 0 indb

Codan Radio Communications VT-4D140 and VT-4D160 VHF Transmitters IM21 001 1 0 0 indb

Users Guide

P25 DIGITAL VHFTRANSMITTERINSTRUCTION MANUALVT-4D 136-174 MHZCovers Models:VT-4D140-R0-000 VT-4D160-R0-000Copyright © 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 Offi ce.Document Number:Revision:Revision Date:IM21-0011-0-0Aug 2003Daniels Electronics Ltd.Victoria, BCPRINTED IN CANADAModule Manuals Included:IM21-VT3150AMP
P25 Digital VHF Transmitter Instruction ManualIM21-001 iiThis 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.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.DOCUMENT CONTROLNOTE
P25 Digital VHF Transmitter Instruction ManualIM21-001 iiiContentsGeneral Information ...............................................................1Introduction ................................................................................................1Performance Specifi cations .......................................................................2Theory of Operation ...............................................................5General ......................................................................................................5Jumper Functions and Standard Confi guration ........................................7Test Points .................................................................................................8Transmitter Programming ........................................................................ 10Transmitter Assembly and Adjustment................................. 13Repair Note.............................................................................................. 13Recommended Test Equipment List ........................................................ 14Transmitter Assembly and Adjustment..................................................... 14Frequency Change .................................................................................. 14Digital Signal Processor Board Alignment ............................................... 15Repeater System Confi guration........................................... 19Digital Repeater ....................................................................................... 19Repeater System Troubleshooting........................................................... 20Illustrations and Schematics ................................................ 23P25 Digital Transmitter Front Panel ......................................................... 24P25 Digital Transmitter Block Diagram .................................................... 25P25 Digital Transmitter Main Board Component Layout - Bottom ........... 26P25 Digital Transmitter Main Board Component Layout - Top................. 27P25 Digital Transmitter Schematic Diagram ............................................ 28P25 Adapter Board Component Layout ................................................... 29P25 Adapter Board Schematic Diagram .................................................. 29Parts Lists ............................................................................ 31P25 Digital Transmitter Electrical Parts List ............................................. 31P25 Digital Transmitter Mechanical Parts List ......................................... 34P25 Adapter Board Parts List................................................................... 35Revision History ................................................................... 37
P25 Digital VHF Transmitter Instruction ManualIM21-0011Manual OrganizationThe 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.GENERAL INFORMATION
P25 Digital VHF Transmitter Instruction ManualIM21-001General Information2VT-4D150 Transmitter Family ModelsThere 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 WattThe transmitters’ band of operation is determined by select components in the amplifi er.Performance Specifi cationsBlank lineGeneralThe 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 MHzRF Power Output: 0.5 to 2.0 or 2.0 to 8.0 W Continuous.Modulation: Analog: 11K0F3E or 16K0F3E (Frequency Modulation).Project 25: 8K10F1ESystem Impedance: 50 Ω; Type N connector.Duty Cycle: 100%; Continuous operation from -30°C to +60°C.Emissions: -70 dBcTransmitter 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 OutputFront Panel Controls: NORM (repeat mode), OFF, and KEY TX (Tx on).MIC MODE: ANALOG and DIGITAL.
P25 Digital VHF Transmitter Instruction ManualIM21-001General Information 3PTT Activation: • Active to ground; Microphone activated; • Front Panel switch: KEY TXPTT 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 installedDOC Type Approval: TBAFCC Type Acceptance: TBAAudio Specifi cationsAudio 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 kHzAudio Deviation Limiting: +/- 2.5 kHz, +/- 5.0 kHzAudio Distortion: < 3% THD; 1 kHz tone at 1.5 kHz or 3 kHz deviationHum and Noise: -34 dB typical
P25 Digital VHF Transmitter Instruction ManualIM21-0014This Page Intentionally Left BlankPhysical Specifi cationsPhysical 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 SO2 gas test with no functional impairment and no change in contact resistance). Digital I/O: 8-pin RJ-45Handle Text Colour: Red
P25 Digital VHF Transmitter Instruction ManualIM21-0015THEORY OF OPERATION
P25 Digital VHF Transmitter Instruction ManualIM21-00113Repair NoteThe 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 specifi cally 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
P25 Digital VHF Transmitter Instruction ManualIM21-00119REPEATER SYSTEM CONFIGURATION
P25 Digital VHF Transmitter Instruction ManualIM21-00123Printed Circuit Board Numbering ConventionDaniels Electronics Ltd. has adopted a printed circuit board (PCB) numbering convention in which the last two digits of the circuit board number represent the circuit board version. All PCB’s manufactured by Daniels Electronics Ltd. are identifi ed by one of the following numbering conventions:PCB number 43-912010 Indicates circuit board version 1.0PCB number 50002-02 Indicates circuit board version 2 (no decimal version)ILLUSTRATIONS AND SCHEMATICS
P25 Digital VHF Transmitter Instruction ManualIM21-001Illustrations and Schematics24DATE: 23 JUL 2003TITLE: Digital Transmitter Front PanelDRAWN BY: Bryan HarperREV DATE: -DWG No: B0297DANIELSELECTRONICS LTD.TM111212122231323414245152561626717278182891929102030AP25 TRANSMITTERTRANSMITTERMODEL IDENTIFIER MICROPHONE MODESELECTION SWITCHTYPE N RF OUTPUT JACK(Antenna) RJ45 CONNECTORSFACTORY SET OPERATINGFREQUENCYMADE IN CANADAVT-4D150ANALOG TRANSMIT LED155.000CNTLBUSABMIC RF OUTADOFFKEY TXNORMFREQUENCY (MHz)MADE IN CANADADANIELSELECTRONICS LTD.TMDIGITAL TRANSMIT LEDMIC MODE DIGITALANALOGON / OFF / KEY SWITCHP25 Digital Transmitter Front Panel
P25 Digital VHF Transmitter Instruction ManualIM21-00131P25 Digital Transmitter Electrical Parts ListRefDesig Description Part NumberPARTS LISTS
P25 Digital VHF Transmitter Instruction ManualIM21-00137Revision Date ECO DescriptionREVISION HISTORY
VHF TRANSMITTER AMPLIFIERINSTRUCTION MANUALVT-3 & VT-4 (132-174 MHz)Covers Models:A21-VPA145-08 A21-VPA165-08Copyright © 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 Offi ce.Document Number:Revision:Revision Date:IM21-VT3150AMP3-3-0Aug 2003Daniels Electronics Ltd.Victoria, BCPRINTED IN CANADA
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP iiThis 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.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.DOCUMENT CONTROLNOTE
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP iiiRF Exposure WarningExposure to radio frequency (RF) energy has been identifi ed as a potential environmental factor that must be considered before a radio transmitter can be authorized or licensed. The FCC has therefore developed maximum permissible exposure (MPE) limits for fi eld strength and power density, listed in FCC 47 CFR § 1.1310. The FCC has furthermore determined that determination of compliance with these exposure limits, and preparation of an Environmental Assessment (EA) if the limits are exceeded, is necessary only for facilities, operations and transmitters that fall into certain risk categories, listed in FCC 47 CFR § 1.1307 (b), Table 1. All other facilities, operations and transmitters are categorically excluded from making such studies or preparing an EA, except as indicated in FCC 47 CFR §§ 1.1307 (c) and (d).Revised FCC OET Bulletin 65 (Edition 97-01) provides assistance in determining whether a proposed or existing transmitting facility, operation or device complies with RF exposure limits. In accordance with OET Bulletin 65 and FCC 47 CFR § 1.1307 (b), this Daniels Electronics Ltd. transmitter is categorically excluded from routine evaluation or preparing an EA for RF emissions and this exclusion is suffi cient basis for assuming compliance with FCC MPE limits. This exclusion is subject to the limits specifi ed in FCC 47 CFR §§ 1.1307 (b) and 1.1310. Daniels Electronics Ltd. has no reason to believe that this excluded transmitter encompasses exceptional characteristics that could cause non-compliance. Notes: • The FCC’s exposure guidelines constitute exposure limits, not emission limits. They are relevant to locations that are accessible to workers or members of the public. Such access can be restricted or controlled by appropriate means (i.e. fences, warning signs, etc.). • The FCC’s limits apply cumulatively to all sources of RF emissions affecting a given site. Sites exceeding these limits are subject to an EA and must provide test reports indicating compliance.RF Safety Guidelines and InformationBase and Repeater radio transmitters are designed to generate and radiate RF energy by means of an external antenna, typically mounted at a signifi cant height above ground to provide adequate signal coverage. The following antenna installation guidelines are extracted from Appendix A to OET Bulletin 65 and must be adhered to in order to ensure RF exposure compliance:Non-building-mounted Antennas: Height above ground level to lowest point of antenna ≥ 10 m or Power ≤ 1000W ERP (1640 W EIRP)Building-mounted Antennas: Power ≤ 1000 W ERP (1640 W EIRP)The following RF Safety Guidelines should be observed when working in or around transmitter sites: • Do not work on or around any transmitting antenna while RF power is applied. • Before working on an antenna, disable the appropriate transmitter and ensure a “DO NOT USE” or similar sign is placed on or near the PTT or key-up control. • Assume all antennas are active unless specifi cally indicated otherwise. • Never operate a transmitter with the cover removed. • Ensure all personnel entering a transmitter site have electromagnetic energy awareness training.For more information on RF energy exposure and compliance, please refer to the following:[1] FCC Code of Regulations; 47 CFR §§ 1.1307 and 1.1310. [2] FCC OET Bulletin 65, Edition 97-01, “Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields”. [3] http://www.fcc.gov/oet/rfsafety/
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP vContentsGeneral Information ...............................................................5Introduction ................................................................................................5Performance Specifi cations .......................................................................6Theory of Operation ..............................................................7Amplifi er Operation ....................................................................................7Power Requirements .................................................................................8VHF Transmitter Amplifi er Current Consumption ........................................... 8RF Circuitry ................................................................................................8VHF Transmitter Amplifi er Lowpass Filter ...................................................... 8Power Control Circuitry ..............................................................................8Power Sensing Circuitry............................................................................. 8Output Power Sense ...................................................................................... 9VSWR Sense.................................................................................................. 9VSWR Overload ............................................................................................. 9VHF Transmitter Amplifi er Alignment ....................................11Repair Note.............................................................................................. 11Recommended Test Equipment List ........................................................ 12General .................................................................................................... 12Standard Factory Settings and Jumper Confi guration ............................. 13VHF Transmitter Amplifi er Alignment ....................................................... 13VHF Transmitter Amplifi er Adjustment.......................................................... 13General Set-Up............................................................................................. 14Output Power Alarm (Forward Power).......................................................... 14Output Power................................................................................................ 15Antenna VSWR Alarm (Reverse Power) ...................................................... 15Antenna VSWR Overload............................................................................. 16Procedure Verifi cation .................................................................................. 16Illustrations and Schematics ................................................ 17VT-3/150 Tranmitter Amplifi er Component Layout ................................... 18VT-3/150 Tranmitter Amplifi er Schematic Diagram .................................. 19VT-3/150 Amplifi er Low Pass Filter Component Layout........................... 20VT-3/150 Amplifi er Low Pass Filter Schematic Diagram.......................... 20Parts Lists ............................................................................ 21VHF Transmitter Amplifi er Electrical Parts List ........................................ 21VHF Transmitter Amplifi er Mechanical Parts List..................................... 24Revision History ................................................................... 25
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP1GENERAL INFORMATIONIntroductionThe VHF Transmitter Amplifi er provides the fi nal stage of RF amplifi cation and fi ltering for the entire VHF Transmitter VT-3 132 - 174 MHz family and the VT-4 P25 Digital VHF Transmitters. The amplifi er has two distinct frequency ranges: 132 to 150 MHz, and 150 to 174 MHz with continuously adjustable 2.0 to 8.0 Watts output power. This Amplifi er is housed in a machined aluminum case that ensures optimum RF shielding, provides a good ground, and also acts as a heatsink.Additionally, the VHF Transmitter Amplifi er is equipped with output power and VSWR sensing lines that can be individually confi gured as open collector or linear outputs. The internal VSWR sensor protects the amplifi er from high antenna VSWR by approximately halving the amplifi er’s RF gain when a VSWR overload condition is present.The Lowpass Filter Board provides output fi ltering for the VHF Transmitter Amplifi er. The Lowpass fi lter assembly is mounted in a separate compartment of the amplifi er case in order to provided maximum attenuation of harmonic and other spurious signals.
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMPGeneral Information2Performance Specifi cationsType: VHF Transmitter Amplifi er module for VT-3/150 , VT-4R and VT-4B series transmitters.Compatibility: MT-3 series FM Transmitter Main Board orMT-4 P25 Digital Transmitter Main Board.Frequency Range: 132-150 MHz or 150-174 MHz.RF Power Output: adjustable 2.0 to 8.0 WattsRF power Input: nominal level adjustable from 0 dBm to +5 dBm, held within +/- 2 dB of nominal.Output Impedance and VSWR: 50 Ω, Type N connector; 3:1 max. VSWR.Input /Output Isolation: > 60 dBDuty Cycle: 100%: Continuous operation from -40˚ C to +60˚C.Harmonic Emissions: < -90 dBc.Transmitter Mismatch Protection: 20:1 VSWR at all phase angles.Transmitter Alarm: Forward power sense and reverse VSWR; - open collector output (separate or ‘OR’ed confi guration);- linear output (separate lines only).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.Amplifi er Standby Current: < 0.5 mA.Amplifi er Enable: Active to ground.Amplifi er Enable Response: typically overdamped, rising to within 90% of full power within 5 msec; maximum (underdamped) overshoot of 30%.
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP3THEORY OF OPERATION
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP7VHF TRANSMITTER AMPLIFIER ALIGNMENTRepair NoteThe VHF Transmitter Amplifi er is mainly made up of surface mount devices that should not be removed or replaced using an ordinary soldering iron. Removal and replacement of surface mount components should be performed only with specifi cally designed surface mount rework and repair stations complete with Electrostatic Dissipative (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.
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP17Printed Circuit Board Numbering ConventionDaniels Electronics Ltd. has adopted a printed circuit board (PCB) numbering convention in which the last two digits of the circuit board number represent the circuit board version. All PCB’s manufactured by Daniels Electronics Ltd. are identifi ed by one of the following numbering conventions:PCB number 43-912010Indicates circuit board version 1.0PCB number 50002-02Indicates circuit board version 2(no decimal version)ILLUSTRATIONS AND SCHEMATICS
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP17VHF Transmitter Amplifi er Electrical Parts ListRefDesig Description Part NumberPARTS LISTS
VHF Transmitter Amplifi er Instruction ManualIM21-VT3150AMP21Revision Date ECO DescriptionREVISION HISTORY

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