Park Air Systems B63300HS User Manual

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T6T 300 Watt VHF Transmitter

User Documentation

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Errata

Any errors found in this handbook , or associated equipment h andbooks, are promulga ted through the Park Air FTP network. Any user can access this information by logging on to:

ftp.parkairsystems.com

When logged on, select the public (Pub) folder, then the Handbook Errata Sheets folder,

and then select the required equipment model.

[Adobe Acrobat™ must be loaded on your PC to use this facility.]

Handbook Title: T6T 300 Watt VHF Transmitter User Documentation Handbook Part Number: 31-3T6T300V Handbook Version: 1.1 Date of Issue: June 2006 Published By: Park Air Systems

Northfields Market Deeping Peterborough PE6 8UE England

Telephone: From UK, 01778 345434

From outside UK, 44 1778 345434

Fax: From UK, 01778 342877

From outside UK, 44 1778 342877

www.parkairsystems.com

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Health & Safety, EN 60950, CAN/CSA-C22.2 No. 60950, UL 60950.

Operation at greater than 200W is subject to FAA approval

Radio IC RSS141, FCC part 15 and 87

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Declaration of Conformity

We, the undersigned,

Company Address, City Country Phone number Fax numbe r

certify and decla re under our sole resp onsibility that the following equipment:

Product description / Intended use EU / EFTA member states intended for use Member states with restrictive use None Manufacturer Brand Type

are tested to and conform with the essential requirements for protection of health and the safety of the user and any other person and Electromagnetic Compatibility, as included in following standards:

Standard Issue date

EN60950-1:2002 2002 EN60215 1989 EN301 489-1, EN301 489-22 06/2005, 11/2003

and is tested to and conforms with the essential radio test suites so that it effectively uses the frequency spectrum allocated to terrestrial/ space radio communication and orbital resources so to as to avoid harmful interference, as included in following standards:

Standard Issue date

EN 300 676 V1.3.1 03/2003

and therefore complies with the essential requirements and provisions of the Directive 1999/5/EC of the European Parliament and of the council of March 9, 1999 on Radio equipment and Telecommunications Terminal Equipment and the mutual recognition of their conformity and with the provisions of Appendix IV (Conformity Assessment procedure referred to in article 10).

The following Notified Body has been consulted in the Conformity Assessment procedure:

Notified Body number

0336 TNO Certification B.V., PO Box 15, 9822 ZG Niekerk, The Netherlands

The technical documentation as required by the Conformity Assessment procedure is kept at the following address:

Company Address, City Country Phone number Fax numbe r

Park Air Systems Limited Northfields, Market Deeping, Peterborough PE6 8UE England +44 1778 345434 +44 1778 342877

Ground to air communications in the VHF aeronautical band All countries

Park Air Systems Limited

PAE T6T HS 300 , T6T HS 200

Name and address

Park Air Systems Limited Northfields, Market Deeping, Peterborough PE6 8UE England +44 1778 345434 +44 1778 342877

TCF/TF reference nr. TCF-124-008 Drawn up in

Northfields, Market Deeping, Peterborough PE6 8UE

Date 10 October 2005

Name and position

A. Horsfield consultant Engineer

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Health and Safety

T6T 300 Watt VHF Transmitter

The T6T 300 watt VHF transm itter op erates from a low vol tage dc input suppl y, or a st andard m ain s ac input supply. When using a mains supply, dangerous voltages are present on the rear panel ac connector and within the equipment. For this reason, only suitably qualified personnel should install and maintain the equipment.

Antenna Radiation WARNING

In use, an antenna is connected to the transmitter. During installation, consideration must be given regarding the resultant field strength in areas accessible to personnel. The formula to determine the field strength is given in the Installation topic.

Beryllium Hazard WARNING

The output transistors used in the power amplifier (PA) of this transmitter contain the toxic material beryllium. Beryllium oxide dust is toxic if inhaled.

Although no procedures in this documentation instruct component removal, users should be aware that there could be a hazard if a PA’s output transistors become physically damaged.

Lifting the Transmitter WARNING

The transmitter weighs approximately 79 kg. When lifting a transmitter, especially when fitting into an equipment cabinet, a minimum of two people should be used. Failure to do so can result in personal injury.

Disposal

This product is covered by the European Directive 2002/96/EC. It must not be disposed of in domestic waste. Disposal should be made using designated collection facilities appointed by the

government or the local authorities in your area.

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Warnings and Cautions

The following warnings and cautions are used in Park Air documentation.

Warnings

A warning is used t o indicate possible danger to personn el. Throughout Park Air user documentation, warnings are indicated by the following symbols:

Indicates electrical danger to personnel.WARNING

Indicates a hazardous material.WARNING

Indi ca t es a non-ioniz i ng radia t ion haz ard. WARNING

Indicates a specified danger to personnel. WARNING

Cautions

A caution is used to indicate possible danger to the equipment. Throughout Park Air user documentation, cautions are indicated by the following symbols:

Indicates the presence of electrostatic sensitive devices (E SDs ). Caution

Indicates a specified danger to the equipment. Caution

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Customer Support

Contacting Park Air

Customer support is available using email, telephone or fax. If you require help in configuring, installing or maintaining equipment supplied by Park Air, use any of the contact methods listed below.

Address: support@uk.parkairsystems.com

Telephone

During normal UK office hours: +44 1778 381557 Outside normal UK office hours: +44 7733 124457

Fax

Fax number: +44 1778 381556

Mail

Address: C ustom er Services Departme nt

Park Air Systems Northfields Market Deeping Peterborough PE6 8UE England

Web Site

Web address: www.parkairsystems.com

Fault Report ing

To ensure that Park Air continues to offer the highest level of after sales service, it is necessary to gather as much information as possible about equipment faults. If any equipment supplied by Park Air becomes unserviceable, please complete a copy of the fault report shown on the next pag e, and return it to the Customer Services department at Park Air.

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Fault Report

Customer: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Address: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Telephone: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Email: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fax: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Details

Park Air works order number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment serial number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Details

Commissioning date. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Failure/repair date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Software version (if known) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment environmen t: Office area / dedicated equipment room / heated / air-conditioned

(delete as applicable)

Fault Detail

Symptoms of fault: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Results of any tests: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Any repairs carried out: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Comments/action requested: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Abbreviations

The following list gives the standard abbreviations used in Park Air user documentation. Aampere ac alternating current AGC automatic gain control AM amplitude modulation ATC air traffic control BER bit error rate BIT built- in tes t C celsius CAS channel associated signalling CCE control centre equipment CD compact disk CSMA carrier sense multiple access dB decibel dBm decibels relative to 1 mW dc direct current DSB double sideband

LED light emitting diode LRU line replaceable unit mmetre mA milliamp MARC multi-access remote control Mbits/s megabits per second MHz megahertz mm millimetre ms m illisecond MSK minimum shift keying mV millivolt mW milliwatt PA power amplifier PC personal computer PCB printed circuit board PCU protocol conversion unit

D8PSK differentially encoded 8-phase shift

keying E1-RIC E1-radio interconnect E-BIT external bit signal EMF electromagnetic force ESD electrostatic sensitive device ETSI European Telecommunications

Standards Institute Fig figure FM frequency modulation ggramme HPA h igh power amp lifier Hz hertz ICAO international civil aviation

organization IF intermediate frequency kbits/s kilobits per second kg kilogramme kHz kilohertz LCD liquid crystal display

pk-pk peak-to-peak ppm parts per million PSU power supply unit PTT press to transmit PVC polyvin y l ch lo r ide RCMS remote control and monitoring

system RF rad io frequency RSE2 remote site equipment RSSI radio signal strength indication SINAD signal plus noise plus distortion to

noise plus distortion ratio S+N/N signal plus noise to noise ratio TDMA time division multiple access TS time slot UHF u ltra high frequency µW microwatt Vvolt VA vol t-ampere

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VCCS voice control and communication

switch VFP virtual front panel VHF very high frequency VOGAD voice-operated gain adjusting device Wwatt

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Table of Contents

Page

Approvals and Standards 3 Health and Safety 5 Customer Support 7 Abbreviations 9

Overview 15

Purpose 16 Models and Part Numbers 18 Mechanical Installation 18 Operating Parameters 19

Frequency Selection 19 Virtual Front Panel 19

Specification 21

General Specification 22

Variants 22 Number of Channels 22 Frequency Accuracy 22 Power Requirements 22 Dimensions and Weight 23

Transmitter 23 Combiner 23

Environmental 23

AM Modes 24

Transmitter RF Characteristics 24

Output Impedance 24 RF Power Output 24 Duty Cycle 24 Channel Spacing 24 Offset Carrier 24 Harmonic Outputs 24 Spurious Outputs 25 Intermodulation 25

Transmitter Modulation Characteristics 25

Mode 25 Modulation Depth 25 Hum and Noise 25 Frequency Response 25 Distortion 25 Residual FM 26 VOGAD 26 Mute 26 Differential Group Delay 26

Transmitter Control 26

Audio Inputs 26 PTT Time Ou t 26

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Table of Con t ent s ( continued)

Page

Mode 2 27

RF Power Rise Time 27 RF Power Decay Time 27 Channel Spacing 27

Transmitter Modulation Characteristics 27

Modulation Rate 27 RMS Phase Error 27 Phase Acceleration 27 Transmitter Control 27 Time Out 27

Mode 3 28

RF Power Rise Time 28 RF Power Decay Time 28 Channel Spacing 28

Transmitter Modulation Characteristics 28

Modulation Rate 28 RMS Phase Error 28 Phase Acceleration 28 Transmitter Control 28

Operation 29

Overview 30 T6T VHF Am plifier 31

Rear Panel Supply Switch 32

Drive Assembly 33

Front Panel Controls and Indicators 34

Scroll/Select Switch and LCD 34 Ready Indicator 34 Transmit Indicator 34 Alarm Indicator 34 Standby Indicator 35 Reference Connector 35 Microphone/Diagnostics Connector 35

Rear Panel Supply Switch 36

Setting Up and Operation 37

Normal Operation 37 Using the Scroll/Select Switch 37 Screen Protocol 38 Menu System 38 Menu Lock Screen 40 Control Screen 40 Notes for Setting Up the Transmitter 41

Front Panel Display for 25 kHz and 8.33 kHz Channel Spacing 41 Line Level Setting 42

Offset Carrier Operation 42 Changing the Transmitter’s Operatin g Frequency 43 To Store and Recall Frequency Channels 44

To Store a Channel Frequency: 44

To Recall a Stored Frequency Channel: 44 To Initiate a BIT Test 45 Standby Mode 46

To Enter Standby Mode 46

To Exit Standby Mode 46 Settings 47 AM-Voice Settings Procedure 49

AM-Voice Mode Settings Screen 49

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Table of Con t ent s ( continued)

Page

AM-MSK Mode Settings Procedure 51

AM-MSK Mode Settings Screen 51 Mode 2 Settings Screen 52 Mode 3 Settings Screen 52 Polarities Screen AM-Voice and AM-MSK 53

AM-Voice and AM-MSK Polarity Settings 53 Mode 2 and Mode 3 Polarity Settings 56 AM-Voice and AM-MSK BIT Screen 57 Mode 2 and Mode 3 BIT Screen 59 Software Configuration Screens 60 Band Edges 61 BIT Status Warning Screens 62

Installation 67

Warnings and Cautions 68

Introduction 69

Fuses and Connectors 70

Installing the Transmitter 71

Initial Inspection of the Transmitter 71

Fitting the Correct ac Input Fuses 71 Fitting the Drive Assembly and Amplifiers into an Equipment Cabinet 72 Connecting the Amplifiers to the Drive Assembly 73 Fitting and Connecting the Combiner 74

Fitting 74

Connecting 75 Connecting the Antenna 75 Connecting the Chassis Stud 77 Connecting the DC Input Supply 77 Connecting the AC Input Supply 78

Configuring the Transmitter for Operational Use 79

Front Panel Connectors 86

Microphone/Diagnostics Connector 86

Reference Connector 86 Rear Panel Connectors 87

MARC Connector 88

MARC Audio Connector 89

MARC Data Connector 91

T1/E1 Connector 92

HDLC Connector 93

External Speaker 94

Facilities Connector 95

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Table of Con t ent s ( continued)

Page

Maintenance 97

Introduction 98

Configuration 98

Hardware Configuration 98

Software Configuration 99

Replacement Modules 99

Scheduled Maintenance 100

Cleaning and Checking Security of Connectors 100 Setting the Transmitter Internal Reference Frequency 100 Setting a 5-Offset Carrier Frequency 101 To Initiate a BIT Test 102 AC and DC Change-over Check 103

Unscheduled Maintenance 104

Introduction 105

Molex KK Connectors 105 Tools, Materials and Test Equipment Required 105 T6T VHF Amplifier Procedures 106

Top and Bottom Covers 106

Removing and Refitting the Interface Module 106

Removing and Refitting the PSU Regulation Module 108

Removing and Refitting the Power Supply Modules 109

Removing and Refitting the Combiner BIT Module 110

Removing and Refitting the PA Modules 112

Removing and Refitting the Front Panel PCB 114

Removing and Refitting the Cooling Fans 115 T6T VHF Drive Assembly Procedures 116

Removing the Top Cover 116

Removing and Refitting the Processor Module 116

Removing and Refitting the PSU Regulation Module 118

Removing and Refitting the Drive Module 120

Removing the Bottom Cover 121

Removing and Refitting the PA Control Module 121

Removing and Refitting the Power Supply 123

Removing and Refitting the Front Panel PCB 124

Virtual Front Panel (VFP) 126

Installing the VFP Software 127 VFP Features 127

The Menu Bar 127

Settings Window 128

Channels Window 128

BIT Window 128

Status Information Window 128 To Change the Drive Assembly Profile or Save a Profile 129 To Initiate a BIT Test 130 To Calibrate the Transmitter 130

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Overview

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Purpose

The T6T 300 watt VHF transmitter is intended for use in fixed ground environments such as airports and en-route centres. The transmitter operates in voice and ICAO defined data modes at frequencies between 118 and 136.975 MHz. Dependent on the software loaded into the radio, the following operating modes can be selected:

❑ AM-Voice. All transmitters have this mode ❑ AM-MSK (optional) ❑ Mode 2 (optional) ❑ Mode 3 (optional).

The transmitter, see Fig 1 and Fig 2, consists of a drive assembly, three 100 watt amplifiers and a combiner. The transmitter is configured as shown in Fig 3. Should any one of th e amplifiers fail, the transmitter continues to operate at reduced (200 watt) power.

T6T VHF Amplifier

T6T V H F D r ive Assemb ly

Fig 1 T6T 300 Watt VHF Transmitter

T6T 300 Watt VHF Transmitter Page 16 Overview

Page 17

Fig 2 T6T VHF Combine r

100 W Amplifier

Drive Ass embly

100 W Amplifier

Combiner

100 W Amplifier

Fig 3 300 Watt Transmitter Arrangement

T6T 300 Watt VHF Transmitter Page 17 Overview

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Models and Part Number s

Table 1 identifies a T6T 300 watt VHF transmitter. Fig 4 shows the ident ification labels attache d to each com ponent. Eac h label identifies the model, part

number, serial number and modification level.

Table 1 Model Identification

Description Part Number Frequency Range Channel

Spacing

Special

Applications

(AM-Voice)

T6T 300 watt standard frequency coverage, high stability, VHF

B63300HS 118 to 136.975 MHz 25 kHz or

8.33 kHz

Supports 5- offset carrie r op e r at io n

transmitter

PAE

Model: Part No: S / No: Mod Record:

Drive Assembly Identification Label Amplifier Identification Label Combiner Identification Label

T6T VHF Drive Assembly 24-06633001/3 2L0001

X 6 7 8 9 10 11 12 13

Park Air Systems Ltd England

PAE

Model: Part No: S / No: Mod Record:

T6T VHF Amplifier 24-31633001/2 2L0001

X 6 7 8 9 10 11 12 13

Park Air Systems Ltd England

PAE

Model: Part No: S / No: Mod Record:

T6T VHF Combiner 24-33633001/2 2L0001

1 2 3 4 5 6 7 8 9 10

Park Air Systems Ltd England

Fig 4 Identification Label Examples

Mechanical Installation

The transmitter, as shown in Fig 1, fits into an industrial standard 19 inch (483 mm ) equipment cabinet and occupies, in total, 14U of cabinet space. Additionally, the combiner must be mounted at the back of the equipment cabinet directly behind the amplifiers’ cooling fans. A bracket provided (shown fitted in

Fig 2) is used to mount the combiner on a cabinet upright.

T6T 300 Watt VHF Transmitter Page 18 Overview

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Operating Parameters

The transmitter’s operating parameters are set using the drive assembly’s multi-purpose Sc roll/Select switch, or remotely from suitable control equipment. Addition ally, the Park A ir Virtual Front Panel (VFP ) software can be used to set up the transmitter.

Frequency Selection

The transmitter is a single frequency synthesised radio th at can operate with 25 kHz and 8.33 kHz channel spacing. The radio recognizes frequencies entered in ICAO format and automatically adjusts to the correct channel spac ing. For multichannel operation up to 100 pres et frequency channels can be stored in the ra dio for immedi ate recall; any combination of 8.33 kHz a nd 25 kHz channel spa cing can be stored. Valid operating frequencies can be selected from the radio’s front panel or a compatible remote control equipment.

Virtual Front Panel

The VFP software supplied on CD with the radio is compatible with any PC or laptop running Windows 2000™ or W indows XP™. The VFP allows change s to a radio’s settings and channel informa tion, it displays the current BIT state, displays BIT history, allows security locks to be set, and provides maintenance facilities. A typical VFP presentation is shown in Fig 5. Using the VFP has several advantages over setting a radio from the front panel; these are:

❑ A profile of the operational settings and chan nel i nformation can be created, s tore d on disk , and

then recalled to download into other radios

❑ A printout of the radio’s profile can be made from the VFP ❑ The front panel controls can be locked. Front Panel Lock is available only when using the VFP.

Fig 5 Typical VFP Presentation

T6T 300 Watt VHF Transmitter Page 19 Overview

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Intentio n ally Blank

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Specification

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General Specification

The general specification applies to the transmitter irrespective of the selected operating mode.

Variants

Only one variant of the T6T 300 watt transmitter is available as detailed in Table 2.

Table 2 300 Watt T6T Transmitter

Description Part Number Frequency Range Special Applic ati ons

300 watt, standa rd frequency coverage, high stabilit y, VHF trans mitter

B63300HS 118 to 136. 975MHz Supports 5-off set carrier

operation

Number of Channels

The transmitter has a multichannel capability. 100 channels can be stored and recalled .

Frequency Accuracy

The frequency accuracy is better than 0.3 ppm.

Power Requirements

The transmitter operates from an ac mains supply, or a dc input supply. When both supplies are connected, the dc input acts as an automatic backup for the ac mains.

ac input supply The transmitter operates from a 48 to 62 Hz single-phase ac supply

and automatically adjusts to operate from any supply voltage ranging from 110 Vac to 230 Vac ±10%. The power consumption figures are given in Table 3.

dc input supply The transmitter operates from a dc input supply between 21.6 and

32 V (measured at the radio’s input). Current loading is given in Table 3.

Table 3 Power Consumption

Requirement

Maximum 3000 VA 75 A Typical 2100 VA 60 A

Not Transmit ti ng 350 VA 3.5 A

T6T 300 Watt VHF Transmitter Page 22 Specification

Normal Operation

ac dc

Page 23

Dimensions and Weight

The transmitter consists of one drive assembly, three amplifiers and a combiner.

Transmitter

The dimensions and wei ghts qu oted below are for a c om plete trans mitter (that is a drive assem bly pl us three amplifiers):

Width 483 mm (19 inches). Height 622.3 mm (24.5 inches). The height occupies 14U of equipment

cabinet space.

Depth 430 mm (16.9 inches) measured from front panel to rear panel.

465 mm (18.3 inches) measured from front panel to rear RF connectors.

Weight 79 kg (174 pounds).

Combiner

The dimensions of the combiner, including connectors, are:

Width 205 mm (8 inches). Height 180 mm (7 inches). Depth 85 mm (3.4 inches). Weight 1 kg (2.2 pounds).

Environmental

Temperature range The transmitter operates to specification across the temperature

range of -20°C to +55°C. The transmitter can be stored at temperatures ranging from

-30°C to +70°C without causing any damage.

Humidity The transmitter operates to specification at a relative humidity

between 5% and 90% non-condensing.

Altitude The transmitter operates to specification up to 15,000 feet.

Additionally it is capable of storage at altitudes up to 50,000 feet without damage.

Shock and vibration The transmitter complies with shock and vibration protection

MIL-STD-810E, method 516.4, procedure VI - Bench Handling.

Ventilation The transmitter is cooled by six integral fans that normally run at half

speed. At an RF PA temperature of 45°C this is increased to full speed and at 40°C it reduces to half speed again.

The transmitter power supply units also use internal fans.

Warm up time The transmitter is fully op erational within 20 seconds but can t ake up

to 10 minutes to achieve frequency accuracy for offset carrier.

T6T 300 Watt VHF Transmitter Page 23 Specification

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AM Modes

The transmitter can operate in AM-Voice mode (st andard) and A M -MSK mo de (opt ional). The following specifications apply to both modes unless stated otherwise. ETSI test methods specified in EN 300 676 are used where applicable.

Transmitter RF Characteristics

Output Impedance

50 ohm via an N-type connector.

RF Power Outpu t

The RF carrier output power is adjustable in 6 W steps from 30 W to 300 W. As an option, the maximum selectable power can be limited. Output power is automatically controlled under the following conditions:

Frequency range Variations in power remain within -0.5 to +1 dB over the operational

frequency range.

Low supply voltage Variations in power remain within ±1 dB for supply voltages between

27 Vdc and 32 Vdc. For voltages less than 27 Vdc the power progressively reduces b y up to 3 dB. When the minimum dc v oltage level is reached, the transmitter dekeys.

High VSWR L oop error can reduce po wer progressively by up to 3 dB. Varia tions

in power remain within ±1 dB into a VSWR of up to 2.5:1. At a VSWR greater than this the output power may be reduced by 10 dB ±1 dB.

High RF PA temperature If the RF PA temperat ure sensor exceeds 80°C the output powe r is

reduced by 3 dB ±1 dB. If the RF PA temperature sensor exceeds 90°C the transmitter is de-keyed and automatically re-keyed at 70°C.

Amplifier failure If one of the three amplifiers fails, the transmitter continues to operate

at 66% of the original set power.

Rise time The power rise time from a keying contact to 90% of full power is less

than 50 ms.

Duty Cycle

Both modes 100% continuous operation.

Channel Spacing

AM-Voice mode The transmitter is capable of both 25 kHz channel spacing and

8.33 kHz channel spacing.

AM-MSK mode 25 kHz.

Offset Carrier

AM-Voice mode The transmitter is capable of offsetting the carrier frequency to provide

2, 3, 4 and 5-offset carrier.

AM-MSK mode Offset carrier is not available.

Harmonic Outputs

All harmonic outputs are less than -80 dBc.

T6T 300 Watt VHF Transmitter Page 24 Specification

Page 25

Spurious Outputs

Both modes The spurious outputs are less than -46 dBm for modulation depths up

to 90%, measured more t han 500 kHz from carrier in the frequency range 9 kHz to 4 GHz. There are no coherent spurious outputs above the spectral mask at less than 500 kHz.

Intermodulation

Both modes Intermodulation products, caused by an interfering signal with the

same power as the transmitter isolated by 30 dB, are at least -40 dBc at ≥±150 kHz and -50 dBc at ≥±500 kHz.

Transmitter Modulation Characteristics

Mode

AM-Voice AM-Voice mode uses Double Sideb and (DSB) Amplitude Modulation

(AM) full carrier; emission designator 6K80A3EJN for 25 kHz channels and 5K00A3EJ N for 8.33 kHz channels.

AM-MSK AM-MSK mode uses Double Sideb and (DSB) Amplitude Modulation

(AM) full carrier; emission designator 13K0A2DJN.

Modula tion Depth

Both modes The transmitter modulation can be set to a maximum of 95%.

Hum and Noise

Both modes The hum and noise is m ore t han 45 dB below the signal level for line

input levels <-13 dBm, and more than 50 dB below the signal level for line input levels ≥-13 dBm, for a carrier modulated by a 1 kHz signal with a modulation depth of 90%.

Frequency Response

25 kHz channel spacing AM-Voice and AM-MSK: The variation in frequency response with

reference to a 1 kHz signal is within +0.5 dB and -1.5 dB across the frequency range 300 to 3400 Hz. The response is also less than

-20 dB at 100 Hz and below, and less than -30 dB at 4 kHz and above.

8.33 kHz channel spacing AM-Voice only: The variation in frequency response with reference to a 1 kHz signal is within +0.5 dB and -1.5 dB across the frequency range 350 Hz to 2500 Hz. The respons e is also less than -10 dB at 100 Hz and below, and less than -30 dB at 3200 Hz and above.

Distortion

25 kHz channel spacing The total harmonic distortion is less than 5% due to signals with a

modulation depth of 90%, within the frequency range 300 Hz to 3400 Hz.

8.33 kHz channel spa cing AM-V oice only: The total harmonic distortion is less than 5% due to signals with a m odulation depth of 90% , within the frequency range 350 Hz to 2500 Hz.

Under extreme conditions, when the loop error protection circuit is active, the distortion is maintained at less than 10%.

T6T 300 Watt VHF Transmitter Page 25 Specification

Page 26

Residual FM

Both modes For a test signal of 1 kH z s et at 80% modulation depth appl ied to the

line input of the transmitter, the unwanted peak frequency modulation does not exceed ±500 Hz.

VOGAD

AM-Voice m ode The VOGAD has an operational range of 30 dB with the threshold

level set at 10 dB belo w the av erage s peech l ine l evel set ting. Within the VOGAD range the modulation depth remains at the set level ±10%. It has an attack time of less than 20 ms and a decay time of greater than 2 seconds, both measured with a 10 dB step to 15 dB into VOGAD.

AM-MSK mode The VOGAD is disabled.

Mute

AM-Voice mode The mute level is set at 15 dB below the average speech line level

setting. The mute can be disabled.

AM-MSK mode The mute is disabled.

Differential Group Delay

AM-MSK mode There is less than 60 µs differential group delay for signals in the

range 1200 to 2400 Hz.

Transmitter Control

Audio Inputs

Audio can be connected to the transmitt er via the front panel mic rophone connector or via the 600 ohm balanced line inputs. Line level setting from -30 to +10 dBm.

PTT Tim e Out

The time out period is adjustable from 2 to 510 seconds in 2 second steps or it can be disabled.

T6T 300 Watt VHF Transmitter Page 26 Specification

Page 27

Mode 2

Mode 2 parameters are identical to AM-Voice mode with the following exceptions.

RF Power Rise Time

The transmitter produces more than 90% of full power output within the first 2 symbols of the power stabilization segment, which is the first segment of the training sequence and consists of 4 symbols each represen ting 000.

RF Power Decay Time

The output power decays by more than 20 dB within 2.5 symbols of the middle of the final symbol.

Channel Spacing

25 kHz channel spacing only.

Transmitter Modulation Characteristics

Mode 2 uses Carrier Sense Multiple Access (CSMA) differentially encoded 8-phase shift keying (D8PSK), using a raised cosine filter with α=0.6 (nominal value), emission designator 14K0G1DE. Information is differentially encoded with 3 bits per symbol transm itted as changes in ph ase rathe r than absolute phase. The dat a stream is divided into groups of 3 consecutive data bits, least significant bit first. Zeros are padded to the end of transmissions if needed for the final channel symbol.

Modulation Rate

The symbol rate is 10,500 symbols/second (±0.005%), resulting in a nominal bit rate of 31,500 bits/s.

RMS Phase Error

The RMS phase error is less than 3°. The error vector magnitude is less than 6%.

Phase Acceleration

The total frequency change during the transmission of the unique word is less than 10 Hz. After this, the phase acceleration is less than 500 Hz/s.

Transmitter Control

All control information and data for transmission is transferred via the HDLC connector. Control information to an as sociated rec eiver is pas sed via the T1/E1 connect or. Dat a f rom the rec eiver is al so passed back via the T1/E1 connector and then transferred to the Mode 2 computer via the HDLC connector. This is illustrated in the Installation topic of this CD.

Time Ou t

The transmitter automat ically de keys i f a transmiss ion e xcee ds 10 s econds . No f ault is f lagg ed and the transmitter keys again for the next transmission.

T6T 300 Watt VHF Transmitter Page 27 Specification

Page 28

Mode 3

Mode 3 parameters are identical to AM-Voice mode with the following exceptions.

RF Power Rise Time

RF Power Decay Time

The output power decays by more than 20 dB within 2.5 symbols of the middle of the final symbol.

Channel Spacing

25 kHz channel spacing only.

Transmitter Modulation Characteristics

Mode 3 uses Time Division Multiple Access (TDMA) differentially encoded 8-phase shift keying (D8PSK), using a raised cosine filter with α=0.6 (nominal value), emission designator 14K0G7WET. Information is differentially encoded with 3 bits per symbol transmitted as changes in phase rather than absolute phase. The data st ream is divided into groups of 3 consecutive d ata bits, least significant bit first. Z eros are padded to the end of transmissions if needed for the final channel symbol.

Modulation Rate

The symbol rate is 10,500 symbols/second (±0.005%), resulting in a nominal bit rate of 31,500 bits/s.

RMS Phase Error

The RMS phase error is less than 3°. The error vector magnitude is less than 6%.

Phase Acceleration

The total frequency change during the transmission of the unique word is less than 10 Hz. After this, the phase acceleration is less than 500 Hz/s.

Transmitter Control

All control information and data for transmission is transferred via the T1/E1 connector. This is illustrated in the Installation topic of this CD.

T6T 300 Watt VHF Transmitter Page 28 Specification

Page 29

Operation

Page 30

Overview

This topic describes the tran smitter’s controls and indicators and de tails how to adjust the o perational settings.

The transmitter comprises a drive assembly, three amplifiers and a combiner. All operational settings are made at the drive assembly’s front panel.

T6T 300 Watt VHF Transmitter Page 30 Operation

Page 31

T6T VHF Ampli fier

There are no operating controls fitted to the amplifier. All operational settings are made at the drive assembly.

The amplifier has three front panel indicators as detailed in Fig 6 and a rear panel Supply switch. Should an amplifier fail, shown by the Alarm indicator being lit, the transmitter continues to operate at reduced power (200 watts).

Ready. A green indicator that lights when the amplifier is ready for use and no BIT faults have been detected.

Alarm. A red indicator that lights when a BIT fault has been

detected.

Transmit. An amber indicator that lights when the transmit circuit is

keyed and the amplifier is producing output power.

Fig 6 T6T VHF Am pl ifi er Front Panel Ind icators

T6T 300 Watt VHF Transmitter Page 31 Operation

Page 32

Rear Panel Supply Switch

The rear panel Su pply switch (Fig 7) is a 2-way rocker switch used to select between power on, and standby.

WARNING Dangerous Voltage

When the Supply switch is set to the S tand by p osition, d ang erous voltage is still present in the internal power suppl y circuitry. To ensu re safe worki ng, the amplifier m ust be isolated from the ac and dc input supplies.

= Standby= On

Fig 7 Rear P anel Supp l y Switch

T6T 300 Watt VHF Transmitter Page 32 Operation

Page 33

Drive Assembly

The transmitter’s operational settings are made from the drive assembly’s front panel (Fig 8). The following pages des cribe the controls and detail how to set u p the transmitter to suit the operational requirement.

No attempt to set up th e transmitter must be made until a ll procedures detailed in the Installation topic have been completed.

Fig 8 T6T Drive Assembly

T6T 300 Watt VHF Transmitter Page 33 Operation

Page 34

Front Panel Controls and Indicators

The drive assembly front panel controls and indicators are shown in Fig 9.

Scroll/Select SwitchLCD

ALARM

TRANSMIT

READY

STANDBY

F r e q 1 1 8 .0 0 0 M H z C h 1 0 0 + 7 . 3 k H z M o d e A M V o i c e 1

P w r

SCROLL/

SELECT

REFERENCE

MICROPHONE/ DIAGNOSTICS

Fig 9 Front Panel Controls and Indicators

Scroll/Select Switch and LCD

The Scroll/Select switch is used in conjunction with the Liquid Crystal Display (LCD) to select most of the transmitter's operational settings. During normal operation, the LCD shows the operating frequency, the channel number (if the channel store facility is used), the offset carrier (if used), and displays a graphical representation of instantaneous peak power.

The example LCD sc reen above shows the t ransmitter operating on 11 8.000 MHz; the frequen cy has been preset as channel 100 and offset at +7.3 kHz.

Ready Indicator

A green indicator that lights when the transmitter is ready for use and no BIT faults have been detected.

Transmit Indicator

An amber indicator that lights when the transmit circuit is keyed and producing output power.

Alarm Indicator

A red indicator that either flashes, or lights, when a BIT fault has been det ected. BIT indications are classified as either Alarms or Alerts.

If an ‘alert’ condition is detected, the Alarm ind icator flashes, the Ready indicator remains lit, and the transmitter remains operational. A BIT ‘alert’ is indicated if:

❑ The transmitter RF output power has reduced from its setting by more than 1 dB but not more than

3 dB

❑ The supply volts falls below a pre-defined level.

Any other BIT condition results in an alarm. When detected, the Alarm indicator lights and the Ready indicator becomes unlit; the transmitter cannot be used.

T6T 300 Watt VHF Transmitter Page 34 Operation

Page 35

Standby Indicator

A red indicator that lights when the tra nsmitter is in stan dby m ode. When in standby mode, m os t of the radio's circuits are inactive, the front panel LCD is blanked, and the transmitter cannot be keyed.

Standby mode is selected and deselected using the front panel Scroll/Select switch and LCD, by initiating an instruction through a MARC system, through a T6 controller or through the VFP. For details of front panel selection and deselection see page 46.

Reference Connector

An SMB jack socket that allows a frequency counter to monitor the transmitter's reference frequency. This connector is used only for maintena nce purposes. The instruction s for checking and adjusting the reference frequency are given in the Maintenance topic.

Microp ho ne / D i agnostics Connector

A dual purpose c onnect or t hat all ows ei ther a m icrophone, or a PC, t o be c onnect ed to the transmitter. The connector is a 7-pin self-locking DIN socket; the pin-out is shown in Table 4.

A microphone i s fitted to t his connector to enable the t ransmi tter to be operated in AM local mo de. The connections are detailed in Table 4. A PC can also be connected to allow the VFP to be displayed. Using the VFP is detailed in the Maintenance topic. The PC connections at the transmitter are shown in Table 5.

Viewed from front

Table 4 Microphone/Diagnostics Connec tor - Audio Connections

Number

1 Microphone ground - 0 V. 3 Microphone PTT Input 0 V to PTT. 5 Sidetone Output 0 to 3 V pk-pk. 6 Microphone input Input 2 to 35 mV rms on Passive setting and 8 to 140 mV rms on

7 Ground - 0 V.

Signal

Input or

Output

Description

Active setting to remain in VOGAD range.

T6T 300 Watt VHF Transmitter Page 35 Operation

Page 36

Table 5 Microphone/Diagnostics Connec tor - PC Connection s

Number

2 Transmit data Output RS232, 115200 baud, 8 dat a bits, 1 stop bit, no parity, no

4 Receive data Input RS232, 115 200 baud, 8 data bits, 1 stop bit, no parity, no

7 Ground - 0 V.

Signal

Input or

Output

Description

handshaking.

Rear Panel Supply Switch

The rear panel Supply switch (Fig 10) is a 2-way rocker switch used to select between powe r on, and standby.

WARNING Dangerous Voltage

When the Supply switch is set to the S tand by p osition, d ang erous voltage is still present in the internal power s upply circuitry. To ensure safe w orking, the drive assembly mus t be isolated from the ac and dc input supplies.

Supply Switch

Fig 10 Drive Assembly Supply Switch

= Standby= On

T6T 300 Watt VHF Transmitter Page 36 Operation

Page 37

Setting Up and Operation

Setting up the transmitter involves using the front panel Scroll/Select switch to specify the operating parameters.

Operating parameters can also be set using the Virtual Front Panel (VFP), through a Multi-Access Remote Control (MARC) system, or from an associated T6 controller. VFP operation is described on this CD under Maintenance; MARC and T6 controller functionality is described in separate documentation.

Table 12 on page 63 details the functions and paramete rs that can be set from all sources.

No attempt to set up the transmitter should be made until the installation procedures, given in the Installation topic, are completed.

Normal Operation

During normal operation, the LCD displays the Main screen. This screen shows the operating frequency, the channel number ( if the channel store f acility is used), the offset carrier (if used), and displ ays a graphical representation of output power when the transmitter is keyed. If the transmitter has been set to Standby mode, which is shown by the front panel Standby indicator being lit, the LCD is blanked.

Scroll/Select SwitchLCD

ALARM

TRANSMIT

READY

STANDBY

F r e q 1 1 8 .0 0 0 M H z C h 1 0 0 + 7 . 3 k H z M o d e A M V o i c e 1

P w r

SCROLL/

SELECT

REFERENCE

MICROPHONE/ DIAGNOSTICS

Using the Scroll/Select Switch

The Scroll/Select switch (referred to throughout th is topic as the ‘Switch’) is used to leave the M ain screen and display the Control screen (see page 40). Further use of the Switch displays various selection menus and allows the required pa rameters to be set. The switch has three actions: it can be turned clockwise, anti-clockwise, or momentarily pushed in.

T6T 300 Watt VHF Transmitter Page 37 Operation

Page 38

Screen Protocol

The following protocol is applicable to all screens described in this document.

Main screen During normal operation, the Main screen (an example of which is shown below

whilst the transmitter is transmitting) is displayed.

F r e q 1 1 8 . 0 0 0 M H z C h 1 0 0 + 7 . 3 k H z M o d e A M V o i c e P w r I I I I I I I I I I

Switch Refers to the front panel Scroll/Select switch. The switch is turned clockwise to scroll

through fields from left to right, and from top to bottom. The switch is turned anti-clockwise to scroll through fields from right to left, and from bottom to top. The switch is pressed to make a selection.

Time out If during any setting up procedure the Scroll/Select switch is not operated for

30 seconds, the display returns to the Main screen. If editing any parameter has not been completed, the transmitter stays on the original setting.

>> Indicates more fields are available other than those currently displayed. To access

those fields, turn the switch clockwise through the last displayed field.

<< Indicates more fields are available other than those currently displayed. To access

those fields, turn the switch anti-clockwise through the first displayed field.

Back When Back is selected, you are returned to the previous menu. Exit When Ex it is selected, you are returned to the Main screen.

Menu System

The front panel control of the radio is implemented through a hierarchical menu system as shown on the following page.

T6T 300 Watt VHF Transmitter Page 38 Operation

Page 39

F r e q 1 1 8 . 0 0 0 M H z C h 1 0 0 M o d e A M V o i c e P w r I I I I I I I I I I

Main Screen

(Example)

Displayed during normal

transmitt er operation

Frequency

Set the

transmitter

operating frequency

Backlight

Adjust the

LCD’s

backlight

Control Screen

Configure the transmitter

operating par ameters , access

the BIT facility or view the

software configuration

Channel

Set or reca ll up

to 100 preset

frequency

channels

Settings

Set the

transmitter

operational

settings

Ref Freq

Adjust the

transmitter

reference

frequency

Initiate a BIT

test and view

Band Edges

Set up the

transmitter

band edges

Menu Lock Screen

BIT

results

S/W Config

transmitter

configuration

Mode and

Mode

Settings

Select mode

View the

software

Standby

Enter or exit

standby mode

Polarities

Set the active

polarity for

certain hardwire

connections

AM-Voice Mode

Settings

(see page 49)

AM-MSK Mode

Settings

(see page 51)

Digital Modes

(see page 52)

Menu System

T6T 300 Watt VHF Transmitter Page 39 Operation

Page 40

Menu Lock Screen

A security facility available only from the VFP allows the drive assembly front panel to be ‘locked’. When this facility is active, no operational settings can be made from the front panel until an ‘unlock’ command is sent from the VFP.

The following screen is displayed when ‘lock’ is active, and the front panel switch is pressed.

S E C U R I T Y M E S S A G E

F r o n t P a n e l

L o c k e d

O K

To exit the system lock screen:

❑ Select OK, then press the switch. You are returned to the Main screen

or,

❑ Wait for the 30 second time out to expire. You are returned to the Main screen.

Control Screen

The Control screen is entered from the Main screen by pressing the switch. T he following screen is displayed:

Change the transmitter operating frequency.

Store or recall preset channel frequencies. Select operating mode and mode settings.

Initiat e a BIT test and view resul ts.

View software configuration.

Enter or exit standby mode.

F r e q u e n c y C h a n n e l S e t t i n g s E x i t > >

B I T S / W C o n f i g S t a n d b y E x i t < <

T6T 300 Watt VHF Transmitter Page 40 Operation

Page 41

Notes for Setting Up the Transmitter

The following notes should be read before setting up the transmitter. They advise on the special frequency display when using 8.33 kHz channel spacing, and give guidance on the optimum line level settings. Note that for operation in the United States of America, this equipment is certified only for operation using 25 kHz channel spacing.

Front Panel Display for 25 kHz and 8.33 kHz Channel Spacing

When setting the o perating frequency of the transm itter and 8.33 k Hz channe l spacing is requi red, the displayed frequency differs from the actual channel frequency. Table 6 shows the pattern used for 25 kHz and 8.33 kHz spaced channel frequencies from 118.000 MHz to 118.141 MHz. The pattern is the same for any frequency within the transmitter's frequency range. The display conforms to ICAO convention for 8.33 kHz operation.

Table 6 25 kHz and 8.33 kHz Channel Spacing Displays

Actual Frequency

(to 4 decimal places)

118.0000 M H z

118.0000 MHz

118.0083 MHz

118.0166 MHz

118.0250 M H z

118.0250 MHz

118.0333 MHz

118.0416 MHz

118.0500 M H z

118.0500 MHz

118.0583 MHz

118.0666 MHz

118.0750 M H z

118.0750 MHz

118.0833 MHz

118.0916 MHz

118.1000 M H z

118.1000 MHz

118.1083 MHz 1 18.1 166 M Hz

Channel Spacing Displayed Frequency

25 kH z

8.33 kHz

25 kH z

8.33 kHz

25 kH z

8.33 kHz

25 kH z

8.33 kHz

25 kH z

8.33 kHz

at Drive Assembly's Front Panel

118.000 M H z

118.005 MHz

118.010 MHz

118.015 MHz

118.025 M H z

118.030 MHz

118.035 MHz

118.040 MHz

118.050 M H z

118.055 MHz

118.060 MHz

118.065 MHz

118.075 M H z

118.080 MHz

118.085 MHz

118.090 MHz

118.100 M H z

118.105 MHz 1 18.1 10 MHz 1 18.1 15 MHz

118.1250 M H z

118.1250 MHz

118.1333 MHz

118.1416 MHz

T6T 300 Watt VHF Transmitter Page 41 Operation

25 kH z

8.33 kHz

118.125 M H z

118.130 MHz

118.135 MHz

118.140 MHz

Page 42

Line Level Setting

The input line level setting displa yed on t he f ront pa nel is eq uivalen t to the average s pee ch level with a peak-to-average ratio of 13 dB. This corresponds to the level specified for the lines.

When testing the transmitter using a sine wave, the line input level should be set to 10 dB above the line level setting. The VOGAD and mute thresholds are preset at 10 dB and 15 dB respectively below the line level se tt ing .

Table 7 shows the relationship between the input line level, VOGAD threshold and mute threshold.

Table 7 Relationship Between Line Level, VOGAD Threshold and Mute Threshold

Line Level Setting

(dBm)

+10 +10 +20 0 -5

+5 +5 +15 -5 -10

00+10-10-15

-5 -5 +5 -15 -20

-10 -10 0 -20 -25

-15 -15 -5 -25 -30

-20 -20 -10 -30 -35

-25 -25 -15 -35 -40

-30 -30 -20 -40 -45

Average Speech

Level (dBm)

Sine Wave Level

(dBm)

VOGAD Threshold

(dBm)

Mute Threshold

(dBm)

Offset Carrier Operation

This transmitter can be set to operate using a 2, 3, 4 or 5-offset carrier system as follows:

❑ With 2-offset carrier working, the carriers are spaced at ±5 kHz ❑ With 3-offset carrier working, the carriers are spaced at zero and ±7.3 kHz ❑ With 4-offset carrier working, the carriers are spaced at ±2.5 kHz and ±7.5 kHz ❑ With 5-offset carrier working, the carriers are spaced at zero, ±4 kHz and ±8 kHz. [5-offset carrier

is available only on HS transmitter variants.]

If using a 2, 3 or 4-offset carrier system, the approp riate offset is selected from the AM-Voice mode settings screen. After selection, no further action is required.

If using a 5-offset carrier system, the appropriate offset (-4 kHz, +4 kHz, -8 kHz or +8 kHz) is selected from the AM-Voice mode settings screen. After selection, the procedure titled ‘Setting a 5-Offset Carrier Frequency’ must be completed; this procedure is found in the Maintenanc e topic.

T6T 300 Watt VHF Transmitter Page 42 Operation

Page 43

Changing the Transmitter’s Operating Frequency

The transmitter’s frequency can be changed in two ways: either from the frequency screen, or by recalling a preset channel. This procedure details the use of the Frequency screen.

(1) From the Control screen, select

frequency to display the Frequency screen.

(2) Turn the switch to highli ght the digit to

be changed, then press the switch.

(3) Turn the switch until the required digit

is shown, then press the sw itch.

(4) Repeat unt il the required frequency is

shown, then highlight OK and press the switch.

(5) Only frequencies that fall betwe en the

band edge settings (see page 61) can be selected.

F r e q 1 1 8 . 0 0 0 M H z

C a n c e l O K

T6T 300 Watt VHF Transmitter Page 43 Operation

Page 44

To Store and Recall Frequency Channels

Up to 100 frequency channels can be stored in the transmitter.

To Store a Channel Frequency:

(1) From the Control screen, select

Channel to display the Channel screen. Highlight Channel, press the switch and then turn it until the required channel number is displayed; press the switch.

(2) Highlight the MHz frequency value

(see Example 2) press the switch and then turn it until the required MHz value is shown. Press the switch.

(3) Highlight the kHz frequency value (see

Example 3), press the swi tch and then turn it until the required kHz value is shown. Press the switch.

(4) Highlight Store and press the switch.

The new frequency is now stored in the selected channel number.

To Recall a Stored Frequency Channel:

(1) From the Control screen, select

Channel to display the Channel screen.

C h 1 0 0 F r e q 1 2 1 . 5 0 0 M H z R e c a l l B a c k E x i t

Channel Screen - Example 1

C h 1 0 0 F r e q 1 1 8 . 0 0 0 M H z S t o r e B a c k E x i t

Channel Screen - Example 2

C h 1 0 0 F r e q 1 1 8 . 0 0 0 M H z O u t s i d e B a n d E d g e B a c k E x i t

Channel Screen - Example 3

(2) To make the transmitter operate on

any preset channel frequency, highlight Channel and press the switch. Turn the switch until the required channel number/frequency is displayed, then press the switch.

(3) Turn the switch to highlight Recall, then

press the switch. Exit the screen. The transmitter now operates on the

recalled channel frequency. Notes: If a frequency outside the band edge limits is

entered, a message (see Example 3) is displayed.

If a frequency not valid for the mode of operation is entered, a message (see Example 4) is displayed.

C h 1 0 0 F r e q 1 1 8 . 0 0 0 M H z

I n v a l i d f o r M o d e

B a c k E x i t

Channel Screen - Example 4

T6T 300 Watt VHF Transmitter Page 44 Operation

Page 45

To Initiate a BIT Test

Use the following procedure to initiate an interruptive BIT test from the drive assembly front panel. A BIT test cannot be initiated while the transmitter is keyed. After a BIT test has been run, the BIT screen is displayed (see AM-Voice and AM-MSK BI T Screen on page 57). An interruptive BIT test cannot be initiated in Mode 2 or Mode 3.

During an interruptive BIT te st, the t ransm itter radiates m odulated carrier waves at the set power. Users should therefore obtain the necessary authority before initiating a test.

If the test is to be carried out with the antenna disconnected, ensure a load is fitted to the transmitter's antenna connector.

In order to test the line input stages, an internally generated 1 kHz tone is injected into the line input circuit. Any other audio present on the line input will cause the test to be inaccurate. Therefore the transmitter MUST NOT be keyed during the test.

(1) From the Main screen, press the switch to display the Control screen. Turn the switch until BIT

is highlighted. Press the switch.

B I T S / W C o n f i g S t a n d b y E x i t < <

(2) Ensure the BIT menu is displayed. Turn the swi tch until BIT Initiate is highlighted. Press the

switch.

B I T I n i t i a t e E T I 0 0 0 0 0 : 0 0 h r s A C S u p p l y O N E x i t > >

(3) During the test, which takes approximately two seconds, the Testing screen is displayed.

T e s t i n g

P l e a s e W a i t

T6T 300 Watt VHF Transmitter Page 45 Operation

Page 46

(4) On completion, and if the interruptive test was initiated from the front panel, one of the following

screens will be shown.

T e s t S t a t u s

P A S S

O K

T e s t S t a t u s

F A I L

O K

(5) Selecting OK takes the user back to the BIT screen. The user can then scroll through the screen

to check out transmitter parameters for failure.

Standby Mode

Standby mode is a pow er saving feature that can be used for non-operat ional transmitters. When in standby mode, most of the transmitter's circuits are inactive, the LCD is blanked, and the transmitter cannot be keyed. To put the transmitter into standby mode, use the following procedure.

When the transmitter is in Standby mode, the red front panel Standby indicator is lit.

To Enter Standby Mode

(1) From the Control screen select

Standby.

(2) At the Standby screen, select Yes. (3) Check that the LCD blanks and the

front panel Standby indicator is lit.

To Exit Standby Mode

(1) Press the Switch. (2) Select Yes. (3) Check that the Main screen is

displayed and that the front panel

Standby indicator is unlit.

E n t e r S t a n d b y ?

Y e s N o

E x i t S t a n d b y ?

Y e s N o

T6T 300 Watt VHF Transmitter Page 46 Operation

Page 47

Settings

Operational settings for the transmitter are configured at the front panel, through the VFP, or through an associated MARC system (or compatible control syst em). Some setti ngs can al so be made remotely vi a a T6 controller. The Settings screen is entered from the Control screen.

The settings that can be selected at the front panel Settings screen are:

❑ Mode: either AM-Voice, AM-MSK, Mode 2 or Mode 3 ❑ Mode settings - allows the selected mode parameters to be set ❑ Polarities ❑ Band edges ❑ Reference frequency ❑ Backlight.

Note that the mode selection, ref erence frequency and backlight are s et from this screen. W hen mode settings, polarities and band edges are selected the user is taken to other screens.

M o d e A M V o i c e M o d e S e t t i n g s P o l a r i t i e s E x i t > >

B a n d E d g e s R e f F r e q 5 0 . 0 % B a c k l i g h t 0 3 0 s E x i t < < > >

B a c k E x i t

Notes:

Select AM-Voice, AM-MSK, Mode 2 or Mode 3. Select for the mode specific Settings menu. Select for the Polarities menu.

Select for band edge settings screen. Align the transmitter reference frequency (Note 1). Adjust the LCD’s backlight time out (Note 2).

(1) Setting the transmitter reference frequency is a maintenance operation. The current value

should not be reset unless the correct test equipment is connected. See the Maintenance topic.

(2) The LCD backlight c an be set f or perm anently on, off , or timed t o st ay on f or a pe riod between

15 and 120 seconds.

General and m ode specific settings, showing def ault val ues , are ref erenced in Table 8 on the following page. Click on any required parameter by page number for further references.

T6T 300 Watt VHF Transmitter Page 47 Operation

Page 48

Table 8 Operat io nal Settings from t he Front Panel

Parameter Mode Adjustment Range Factory Default Setting Further

Menu lock screen All Locked or unlocked Unlocked page 40 Enter standby

mode Exit standby mode All Yes or No - page 46 Set mode of

operation Set polarities AM -Voice,

Band edges All 118.000 to 136.975 MHz 118.000 and 136.975 MHz page 61 LCD backlight All 15 to 120 s, On or Off 30 s page47 RF power All 30 to 300 W (6 W steps) 300 W page 49 and

Audio line in level AM-Voice,

Inhibit AM-Voice,

PTT (key) AM -Voice,

Tx time out AM-Voice,

Modulation depth AM-Voice,

Mute AM-Voice On or Off On page 49 VOGAD AM-Voice On or Off On page 49 Antenna C/O delay AM-Voi ce

All Yes or No - page 46

All AM-Voice, AM-MSK,

Mode 2 or Mode 3 STD or INV STD page 53

AM-MSK

-30 to +10 dBm -13 dBm page 49 and

AM-MSK

On or Off Off page 49 and

AM-MSK

On (key) or Off (de-key) Off page 49 and

AM-MSK

2 to 510 s or Off 180 s page 49 and

AM-MSK

5 to 95% 85% page 49 and

AM-MSK

On or Off

AM-Voice page 47

Reference

page 51

page 49

AM-MSK

Offset AM-Voice 0, ±2.5, ±4, ±5, ±7.3, ±7.5

Ste p AM-Voice 8.33 kHz, 25 kHz or both 25 kHz page 50 Mic AM-Voice Active or Passive Passive page 50 Key priority AM-Voice,

AM-MSK

Local PTT AM-Voice,

AM-MSK

Remote PTT AM-Voice,

AM-MSK

Remote phantom PTT

T6T 300 Watt VHF Transmitter Page 48 Operation

AM-Voice, AM-MSK

On or Off

or ±8 kHz

Local-Remote or Remote-Local

Enabled or Disabled Enab led page 50 and

Off 0 (No offset) page50

Local-Remote page 50 and

page 51

Page 49

AM-Voice Settings Procedure

During this procedure, the following parameters, applicable to AM-Voice operation, can be set:

❑ RF power output ❑ Audio line input level ❑ Inhibit (on or off) ❑ PTT on (key) or off (de-key) ❑ Transmitter time out ❑ Modulation depth ❑ Mute (on or off) ❑ VOGAD (on or off) ❑ Antenna change-over delay (on or off) ❑ Offset ❑ Step ❑ Mic (active or passive) ❑ Key pr iority (local or remo te) ❑ Enable or disable local PTT ❑ Enable or disable remote PTT ❑ Enable or disable remote phantom PTT.

AM-Voice Mode Settings Screen

The AM-Voice mode setting sc reen is accessed from the Setti ngs screen. Use the Scroll/Select switch to select the parameter, then enter the required setting(s). Notes regarding optimum line levels are given on page 42.

Adjustments

P o w e r 3 0 0 W L i n e I n - 1 3 d B m

I n h i b i t O F F

E x i t > >

P T T O F F T X T i m e o u t 1 8 0 s M o d D e p t h 8 5 % E x i t < < > >

M u t e O N V O G A D O N A n t C / O D e l O N E x i t < < > >

RF power between 30 W and 300 W. Audio line in level between -30 to +10 dBm. On or Off.

On (key) or Off (de-key). 2 to 510 s or Off. 5 to 95%.

On or Off. On or Off. On or Off.

T6T 300 Watt VHF Transmitter Page 49 Operation

Page 50

Adjustments

O f f s e t 0 . 0 k H z S t e p 2 5 k H z M i c P A S S I V E E x i t < < > >

K e y P r i o r i t y L - R L o c a l P T T E N R e m o t e P T T E N E x i t < < > >

R e m P h a n P T T E N B a c k E x i t < <

See Offset Carrier Operation on page 42. 25 kHz, 8.33 kHz or both. Active or Passive.

Local-remote or Remote-local. Enabled or Disabled. Enabled or Disabled.

Enabled or Disabled. Return to Settings screen.

T6T 300 Watt VHF Transmitter Page 50 Operation

Page 51

AM-MSK Mode Settings Procedure

During this procedure, the following parameters, applicable to AM-MSK operation, can be set:

❑ RF power output ❑ Audio line input level ❑ Inhibit (on or off) ❑ PTT on (key) or off (de-key) ❑ Transmitter time out ❑ Modulation depth ❑ Antenna change-over delay (on or off) ❑ Key pr iority (local or remo te) ❑ Enable or disable local PTT ❑ Enable or disable remote PTT ❑ Enable or disable remote phantom PTT.

AM-MSK Mode Sett ings Screen

The AM-MSK mode setting screen is accessed from the Settings screen. Use the Scroll/Select switch to select the parameter, then ent er the required set ting(s). Notes regarding op timum line level s are given on page 42.

P o w e r 3 0 0 W L i n e I n - 1 3 d B m

I n h i b i t O F F

E x i t > >

P T T O F F T X T i m e o u t 1 8 0 s M o d D e p t h 8 5 % E x i t < < > >

A n t C / O D e l O N K e y P r i o r i t y L - R L o c a l P T T E N E x i t < < > >

Adjustments

RF power between 30 W and 300 W. Audio line in level between -30 to +10 dBm. On or Off.

On (key) or Off (de-key). 2 to 510 s or Off. 5 to 95%.

On or Off. Local-remote or Remote-local. Enabled or Disabled.

R e m o t e P T T E N R e m P h a n P T T E N B a c k

Enabled or Disabled. Enabled or Disabled. Return to Settings screen.

E x i t < <

T6T 300 Watt VHF Transmitter Page 51 Operation

Page 52

Mode 2 Settings Screen

This is an advisory screen. Pressing OK returns the user to the Main screen.

M o d e 2 p a r a m e t e r s a r e s e t v i a t h e H L D C i n t e r f a c e

O K

Mode 3 Settings Screen

This is an advisory screen. Pressing OK returns the user to the Main screen.

M o d e 3 p a r a m e t e r s a r e s e t v i a t h e T 1 / E 1 i n t e r f a c e

O K

T6T 300 Watt VHF Transmitter Page 52 Operation

Page 53

Polarities Screen AM-Voice and AM-MSK

A number of remote in dicat ion an d cont rol signa ls c an be h ardwire connected to the transmitter. These signals, which can have their polarities set to standard (STD) or inverted (INV), are listed in Table 9.

The Polarities screen is accessed from the Settings screen.

AM-Voice and AM-MSK Polarity Settings

Each of ten polarity settings applicable to AM-Voice and AM-MSK can be set to the default STD (standard) or INV (inverted) setting. The signal connections are shown in Table 9 along with the conditions when STD or INV is selected. The settings for the PTT Reference voltage are also given.

R e a d y O u t S T D E - B I T I n S T D

I n h i b i t I n S T D

E x i t > >

B I T S t a r t I n S T D P T T R e f + 1 4 V P T T I n S T D E x i t > >

P h a n P T T I n S T D P T T O u t S T D F a s t P T T O u t S T D E x i t < < > >

E x t V S W R I n S T D A n t C / O O u t S T D B a c k E x i t < <

T6T 300 Watt VHF Transmitter Page 53 Operation

Page 54

Table 9 AM-Voice and AM-MSK Polarity Settings

Signal Connector Polarity set to STD Polarity set to INV

Ready Out Facilities, pin 13 An open collector grounded

output when the radio is ready to transmit and no BIT faults are detected.

E-BIT In Facilities, pin 2 TTL input. 0 V indicates an

extern a l fault.

Inhibit In Facilities, pin 10 TTL input. 0 V inhibits

transmitter operation.

BIT Start In Facilities, pin 11 TTL input. 0 V initiates an

interruptive BIT test.

PTT In MARC, pin 4

MARC Audio, pin 6

Phantom PTT In (Phan PTT In)

MARC or MARC Audio, pin 2

Active when input differs from reference by more t han 10 V. Inactive wh en input dif fers from reference by less than 1 V. Maximum input level ±60 V with respect to reference. Input will dra w no mo re than 6 m A, requires at least 1 mA to operate.

An open collector high impedance output when t he radio is ready to transmit and no BIT faults are detected.

TTL input. 5 V indicates an external fault.

TTL input. 5 V inhibits transmitte r operation.

TTL input. 5 V initiates an interruptive BIT test.

Active when input dif fers from reference by less than 1V. Inactive when input dif fers from reference by more than 10 V. Maximum input level ±60 V with re spec t to re fe re nce . Inp ut will draw no more than 6 mA, requires at least 1 mA to operate.

Active when input dif fers from reference by less than 1V. Inactive when input dif fers from reference by more than 10 V. Maximum input level +60 V with re spec t to re fe re nce . Inp ut will draw no more than 6 mA, requires at least 1 mA to operate.

PTT Out Facilities, pin 3 Grounding solid state relay.

+60 to -60 V, ac or dc, 100 mA max, n/o. Activated 20 ms (±1 ms) before the start of the power ramp up to allo w for the antenna relay to pull-in time.

External VSWR Input

(Ext VSWR In)

Antenna Change-over

(Ant C/O Out)

T6T 300 Watt VHF Transmitter Page 54 Operation

Facilities, pin 4 TTL input. 0 V active. TTL input. 5 V active.

Facilities, pin 5 (Common, pin 6)

Solid state relay. +60 to -60 V, ac or dc, 100 mA max, n/o. Activated 35 ms (± 1 ms) befor e the start of the powe r ramp up to allow for the antenna relay pull-in time.

Grounding solid state relay. +60 to -60 V, ac or dc, 100 mA max, n/c. Activat e d 2 0 ms (±1 ms) before the start of the power ramp up to allow for the antenna relay to pull-in time.

Solid state relay. +60 to -60 V, ac or dc, 100 mA max, n/c. Activated 35 ms (± 1 ms) before the start of the power ramp up to allow for the antenna relay pull-in time.

Continued ...

Page 55

Table 9 AM-Voice and AM-MSK Polarity Settings (Continued)

Signal Connector Polarity set to STD Polarity set to INV

Fast PTT Output (antenna change-over)

PTT Ref - PTT Ref can be set to +14 V,

MARC Audio, pin 3 Open collector NPN transistor

grounding out put, 200 mA m ax, n/o.

0 V or -14 V. Maximum input level ±6 0 V with respe ct to PTT reference. Input will draw no more than 6 mA, and requires at least 1 mA to operate.

When the input PTT signal and the PTT reference differ by more than 10 V the radio keys.

When the input PTT signal and the PTT refere nce are within 1 V, the radio dekeys.

Other conditions are indeterminable.

Open collector NPN transistor grounding out put, 200 mA m ax, n/c.

PTT Ref c a n be set to +14 V, 0 V or -14 V. Maximum input level ±60 V with re spec t to PTT reference. Input will draw no more than 6 mA, and requires at least 1 mA to operate.

When the input PTT signal and the PTT referenc e differ by more than 10 V the radio dekeys.

When the input PTT signal and the PTT reference are wi thi n 1 V, the radio keys.

Other conditi ons are indeterminable.

T6T 300 Watt VHF Transmitter Page 55 Operation

Page 56

Mode 2 and Mode 3 Polarity Settings

R e a d y O u t S T D E - B I T I n S T D E x t V S W R I n S T D E x i t > >

Each of the three polarity settings applicable to Mode 2 and Mode 3 can be set to t he default STD (standard) or INV (inverted) setting.

The signal connec tions are detailed in Table 10 along with the conditions when STD or INV is selected.

B a c k E x i t

< <

Table 10 Mode 2 and Mode 3 Polarity Settings

Signal Connector Polarity set to STD Polarity set to INV

Ready Out Facilities, pin 13 An open collector grounded

output when t he radi o is rea dy to transmit and no BIT faul ts are detected.

An open collecto r hi gh impedance output when t he radio is ready to transmit and no BIT faults are detected.

E-BIT In Facilities, pin 2 TTL input. 0 V indicates an

external fault.

External VSWR Input

Facilities, pin 4 TTL input. 0 V active. TTL input. 5 V active.

TTL input. 5 V indicates an external fault.

T6T 300 Watt VHF Transmitter Page 56 Operation

Page 57

AM-Voice and AM-MSK BIT Screen

The AM-Voice and AM-MSK BIT screen is accessed from the Control screen.

B I T I n i t i a t e E T I 0 0 0 0 0 : 0 0 h r s A C S u p p l y O N E x i t > >

D C S u p p l y O N S u p p l y 2 8 V S y n t h L o c k P A S S E x i t < < > >

P A T e m p 5 0 d e g C P A C o o l i n g P A S S B a s e b a n d P A S S E x i t < < > >

R F D r i v e P A S S P A O u t p u t P A S S P A L o o p P A S S E x i t < < > >

Select to in it ia t e B IT test. Shows elapsed time 0:00 to 99999:59 (Hrs:Min). Shows state of ac supply (On or Off).

Shows state of dc supply (On or Off). dc supply 0 to 40 V, <21.6 V Alert, <19 V Alarm. Pass or Fail (Out-of-Lock).

PA temperature -20°C to +150°C. Pass or Fail. Pass, Fail or Not Tested.

Pass, Fail or Not Tested. Pass, Fail or Not Tested. Pass, Fail or Not Tested.

M o d D e p t h P A S S R F F i l t e r s P A S S V S W R P A S S E x i t < < > >

L o o p E r r o r P A S S A u d i o I n P A S S D S P 1 P A S S E x i t < < > >

T6T 300 Watt VHF Transmitter Page 57 Operation

Pass, Fail or Not Tested. Pass, Fail or Not Tested. Pass, Fail or Not Tested.

Pass or Fail. Pass, Fail or Not Tested. Pass or Fail.

Page 58

D S P 2 P A S S X i l i n x 1 P A S S X i l i n x 2 P A S S E x i t < < > >

Pass or Fail. Pass or Fail. Pass or Fail.

E E P R O M P A S S S t a r t U p P A S S C a l i b r a t i o n P A S S E x i t < < > >

U n k e y e d P w r P A S S E - B I T P A S S M A R C A C T I V E E x i t < < > >

H D L C I N A C T I V E T 1 / E 1 I N A C T I V E B a c k E x i t < <

Pass or Fail. Pass or Fail. Pass or Fail.

Pass or Fail. Pass or Fail. Active or Inactive.

Active or Inactive. Active or Inactive.

T6T 300 Watt VHF Transmitter Page 58 Operation

Page 59

Mode 2 and Mode 3 BIT Screen

The Mode 2 and Mode 3 BIT screen is accessed from the Control screen.

E T I 0 0 0 0 0 : 0 0 h r s A C S u p p l y O N D C S u p p l y O N E x i t > >

S u p p l y 2 8 V S y n t h L o c k P A S S P A T e m p 5 0 d e g C E x i t < < > >

P A C o o l i n g P A S S V S W R P A S S L o o p E r r o r P A S S E x i t < < > >

D S P 1 P A S S D S P 2 P A S S X i l i n x 1 P A S S E x i t < < > >

Shows elapsed time 0:00 to 99999:59 (Hrs:Min). Shows state of ac supply (On or Off). Shows state of dc supply (On or Off).

Shows value of dc supply. Synth lock (Pass or Fail). Indicates the PA temperature.

Pass or Fail. Pass, Fail or Not Tested. Pass or Fail.

Pass or Fail. Pass or Fail. Pass or Fail.

X i l i n x 2 P A S S E E P R O M P A S S S t a r t U p P A S S E x i t < < > >

C a l i b r a t i o n P A S S E - B I T P A S S M A R C A C T I V E E x i t < < > >

H D L C I N A C T I V E T 1 / E 1 I N A C T I V E B a c k E x i t < <

T6T 300 Watt VHF Transmitter Page 59 Operation

Pass or Fail. Pass or Fail. Pass or Fail.

Pass or Fail. Pass or Fail. Active or Inactive.

Active or Inactive. Active or Inactive.

Page 60

Software Configuration Screens

Software configuration screens are as follows:

T 6 V H F 1 0 0 W T X 1 1 8 - 1 3 6 . 9 7 5 M H z H i g h S t a b i l i t y E x i t > >

B o o t S o f t w a r e 6 5 - x x x x x x x x / v v

E x i t < < > >

B a s e S o f t w a r e 6 5 - x x x x x x x x / v v

E x i t < < > >

M o d e S o f t w a r e 6 5 - x x x x x x x x / v v

E x i t < < > >

The first screen defines the radio.

65-xxxxxxxx represents the software part number and /v v represents its version.

Current mode running. 65-xxxxxxxx represents the software part number and /v v represents its version.

F i l l 1 S o f t w a r e 6 5 - x x x x x x x x / v v [ D e s c r i p t i o n ] E x i t < < > >

T6T 300 Watt VHF Transmitter Page 60 Operation

65-xxxxxxxx represents the software part number and /v v represents its version.

The tran sm it ter has fo ur s o ftw a re f ills. Fills 2, 3 and 4 screens are the same format as this example shown for Fill 1.

Page 61

Band Edges

The frequency rang e of the T6T 300 watt trans mitter is 118 to 136.975 MHz. If required, transmission can be limited to either one or t wo s m aller parts of t he frequency band by setting the band edges, BE1 to BE4. Transmission is possible between BE1 and BE2 frequencies, and between BE3 and BE4 frequencies.

B E 1 1 1 8 . 0 0 0 M H z B E 2 1 3 6 . 9 7 5 M H z B E 3 1 1 8 . 0 0 0 M H z E x i t > >

The Band Edge screen is accessed from the Control screen.

Band edge frequencies can be set only in increments of 25 kHz.

If the transmitter is required to ope rate over the full range, the band edge parameters must be set

B E 4 1 3 6 . 9 7 5 M H z

to the lowest and highest values in the range (see

Table 11).

E x i t < <

T able 11 Band Edge Settings

B63300HS set so that the full frequency range can be transmitted.

Example: Transmitter set to transmi t onl y those frequencies in the range 120 to 130 MHz.

Example: Transmitter set to transmi t onl y those frequencies in the ranges 120 to 125 MHz and 130 to 135 MHz.

BE1 BE2 BE3 BE4

118.000 136.975 118.000 136.975

120.000 130.000 120.000 130.000

120.000 125.000 130.000 135.000

T6T 300 Watt VHF Transmitter Page 61 Operation

Page 62

BIT Status Warning Screens

The following shows some example BIT screens. These screens alternate with the Main screen when an alert or alarm condition is present. Only the parameters causing the alert or alarm are displayed, and if both an alert and alarm condition exists simultaneously only the alarm information is displayed. If multiple parameters are signalling an alert or alarm condition, multiple screens are used to display the status alternating with the Main screen.

A L E R T

S u p p l y 2 1 V

A L E R T R F P o w e r R e d u c e d L o o p E r r o r S u p p l y 2 1 V

A L E R T R F P o w e r R e d u c e d P A T e m p 8 5 d e g C

A L A R M R F P o w e r R e d u c e d V S W R F A I L

Alert:

There is no RF power reduction. The Alarm indicator is flashing.

Alert:

The RF output power is reduced between 1 and 3 dB. The Alarm indicator is flashing.

Alert:

The RF output power is reduced between 1 and 3 dB. The Alarm indicator is flashing

Alarm:

The RF output power is reduced by more than 3 dB. The Alarm indicator is lit.

A L A R M R F P o w e r R e m o v e d L o o p E r r o r F A I L S u p p l y 1 8 V

A L A R M R F P o w e r R e m o v e d P A T e m p 9 5 d e g C

T6T 300 Watt VHF Transmitter Page 62 Operation

Alarm:

The RF output power is shut down. The Alarm indicator is lit.

Alarm:

The RF output power is shut down. The Alarm indicator is lit.

Page 63

T able 12 Functions and Parameters

Function Front

FREQUENCY

Change frequency

FREQUENCY CHANNELS

Store/Recall preset frequency channels

SETTINGS

Set modulation mode

Radio Settings (AM Modes)

Set RF output power

Set audio input line level

Set inhibit on or of f

Panel

✔✔✔ ✔ ✔✔ 118.000 MHz

✔✔✔ ✔ ✗ ✗

✔✔✔ ✔ ✔✔ AM -Voice

✔✔✔ ✔ ✔✔

✔✔✔ ✗ ✔✗

✔✔✔ ✗ ✗✗

VFP MARC T6

Controller

T1/E1 HDLC Default Setting

300 W

-13 dBm

Off

PTT test fa ci lit y on (key), off (dekey)

Set Tx time out

Set modulation depth

Set mute on or off (AM-V o ice only)

Set VOGAD on or off (AM-V o ice only)

Set antenna C/O delay on or off

Set frequency offset (AM-V o ice only)

Set frequency step size (AM-V o ice only)

✔✔

View state

✗✔✗ Off

✔✔✔ ✗ ✔✗

✔✔✔ ✔ ✔✗

✔✔✔ ✗ ✗✗

✔✔ ✗ ✗ ✗ ✗

180 s

85%

AM-Voice - On

AM-MSK - Off

0 (No offset)

25 kHz

Continued ...

T6T 300 Watt VHF Transmitter Page 63 Operation

Page 64

Table 12 Functions and Parameters (Continued )

Function Front

Set microphone type (active or pass ive) (AM-V o ice only)

Set keying priority (local or remote)

Enable or disable local PTT

Enable or disable remote PTT

Enable or disable remote phantom PTT

Radio Settings (Digital Modes)

MAC TM1 (inter access delay)

Panel

✔✔ ✗ ✗ ✗ ✗ Passive

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗ Enabled

✔✔ ✗ ✗ ✗ ✗

✗✔✗ ✗ ✗✔

VFP MARC T6

Controller

T1/E1 HDLC Default Setting

Local-Remote

Enabled

2.5 ms

MAC TM2 (channel busy)

MAC p (persistance)

MAC M1 (maximum number of access attempts)

Scramble vector ✗✔✗ ✗ ✗✔

Tx enable ✗✔✗ ✗ ✗✔ On

Polarities

Ready out

Set PTT input polarity (AM modes only)

Set phantom PTT input polarity (AM modes only)

✗✔✗ ✗ ✗✔

✔✔

View state

✗✗✗

60 s

13/256

135

4D4B

19787

STD

Continued ...

T6T 300 Watt VHF Transmitter Page 64 Operation

Page 65

Table 12 Functions and Parameters (Continued )

Function Front

Set PTT reference voltage (AM modes only)

Set PTT output polarity (AM modes only)

Set fas t PTT antenna changeover output polarity (AM modes only)

Set antenna change-over output polarity (AM modes only)

Set external VSWR input polarity (All mod es)

Set inhibit input polarity (AM modes only)

Panel

VFP MARC T6

✔✔

View state

Controller

T1/E1 HDLC Default Setting

✗✗✗ +14 V

✗✗✗

✗✗✗ STD

✗✗✗

STD

BIT interruptive test input polarity (AM modes only)

E-BIT input polarity (All mod es)

Band Edges

Set band edges

Reference Frequency

Adjust transmi tte r’s reference frequency

LCD Backlight

Adjust LCD backlight

BIT

Initiate BIT interruptive test

✔✔

View state

✗✗✗

STD (active low)

✔✔ ✗ ✗ ✗ ✗118.000 and 136. 975 M Hz

✔✔ ✗ ✗ ✗ ✗

✔✔✔ ✔ ✗ ✗

30 s

Continued ...

T6T 300 Watt VHF Transmitter Page 65 Operation

Page 66

Table 12 Functions and Parameters (Continued )

Function Front

STANDBY

Enter and exit standby facil ity

SOFTWARE CONFIGURATION

View the transmitter’s software configuration

LOCK FACILITIES

Front panel lock

MARC lock

T1/E1 lock

HDLC lock

Panel

✔✔✔ ✔ ✗ ✗ Not in Standby

✔✔ ✗ ✗ ✔✔

✗✔✗ ✗ ✗✗

VFP MARC T6

Controller

T1/E1 HDLC Default Setting

Off

T6T 300 Watt VHF Transmitter Page 66 Operation

Page 67

Installation

Page 68

Warnings and Cautions

WARNING Dangerous Voltage

The instructions given in this topic involve connecting dangerous voltage to the transmitter and should be carried out only by suitably qualified personnel.

WARNING Dangerous Voltage

The equipment is permane ntly connected to the mains su pply when the mains con nectors are attached. Switching the rear panel Supply switch to off does not isolate all internal circuits from the mains supply. For this reason, a mains isolating switch shou ld be fitted close to, and easily accessible from, the transmitter's posi tion. The isolation switch should isolate both live and neutral supplies to the IEC connectors fitted to the drive assemb ly and amplifiers, be clearly labelled, and adequately rated to protect the equipment.

WARNING

Antenna Radiation

The antenna used with the transmitter must be installed such that the resultant radiated field strength is below 10 W/m² in areas normally accessible to perso nne l.

The RF field strength from the antenna can be predicted from the equation S=1.4PG/4πR

[Where S = power density; P = power inpu t to antenna; G = antenna gain; R = distance to centre of radiation and 1.4 = multiplication factor for average power based on a modulation index of 90%.]

Based on this formula for a 300 watt transmitter and using a 0 dBi antenna, the predicted safe distance from the centre of radiation would be approximately 1.8 m for a field strength of 10 W/m (1 mW/cm2).

This meets the requirements of Health Canada Safety Code 6 for RF and microwave exposed workers. For persons not classed as RF and microwave workers and includ ing the general public the limit is 2 W/ m

(0.2 mW/cm2) which increases the minimum safe distance to 4.1 m.

Further information on calculating the field strengths and power levels can be found in Health Canada Safety Code 6 'Limits of Human Exposure to Radiofrequency Electromagnetic Fields in the Frequency Range 3 kHz to 300 GHz', and also in FCC document OET Bulletin 65.

Caution

ESDs

The T6T transmitter's circuitry contains Electrostatic Sensitive Device s (ESDs). Personnel must be aware of the precautions nec essary to prevent damage to such devices. During installation all precautions necessary to prevent ESD damage must be taken.

Caution Unauthorized Modifications

Changes or modifications made to this equipment that are not expressly approved by Park Air, or parties authorized by Park Air, c ould void the user’s authority to operate the equipment.

T6T 300 Watt VHF Transmitter Page 68 Installation

Page 69

Introduction

The procedures necessary to install a transmitter are listed in Table 13. Installation is in two parts: Steps 1 to 9 in Table 13 must be completed irrespective of how the tra nsmitter is to be configured; step 10 provides a selection of different configurations.

Table 13 Installation Procedures

Step Pr ocedure Reference

1 Read and understand the warnings and cautions given on page 68. 2 Perform an initi al inspection of the transmitter and f it the correct ac i nput fuse. page 71 3 Fit the drive assembly and amplifiers into an equipment cabinet. page 72 4 Connect the amplifiers to the drive assembly. page 73 5 Fitting and connecting the combiner. page 74 6 Connect the antenna. page 75 7 Connect the chassis stud to the cabinet or system earth. page77 8 Connect the dc input supply (if required). page 77 9 Connect the ac input supply (if required). page 78

10 Configuring the transmitter for operational use. page 79

T6T 300 Watt VHF Transmitter Page 69 Installation

Page 70

Fuses and Connectors

The following list details the equipment supply fuses and connectors. Some of the connectors (depending on your particular configuration) are required during installation.

Table 14 Fuses and Connectors

Component Type Park Air Part Number

Fuses:

AC input fuses, F3 and F4 for 110-240 V input AC input fuse, F2 for 110-240 V input

DC input fuses, F1 (drive assembly), F1 and F2 (amplifier) 15A size 0 29-01350201

Connectors:

AC supply connectors IEC 20-02030102 DC supply connectors XLR 3-pin 20-01030106 Antenna connector N-type plug 19-01030301 MARC connector 9-way D-type plug Plug: 20-01090100

MARC audio RJ48 plug 20K01080100 MARC data RJ48 plug 20K01080100 Facilities connector 15-way D-type plug Plug: 20-01150100

HDLC connector RJ48 plug 20K01080100 T1/E1 connector RJ48 plug 20K01080100 Reference connector SMB connector 19C01050300 Microphone/Diagnostics connector 7-pin DIN plug 20-01070101

T6.3AH, 250V T3.15AH, 250V

29L01170108S 29C01100102S

Cover: 20-09090101

Cover: 20-09150101

T6T 300 Watt VHF Transmitter Page 70 Installation

Page 71

Installin g th e Tran sm itt er

Initial Inspection of the Transmitter

The transmitter comprises:

❑ One T6T VHF drive assembly ❑ Three T6T VHF amplifiers ❑ One T6T VH F c ombiner ❑ One phasing harness.

On receipt of the transmitter, remove all transit packaging and check that there is no damage. If damage is evident, contact Park Air immediately and retain the original transit packaging.

Fitting the Correct ac Input Fuses

The mains input fuses are an integral part of the rear panel ac connectors. The fuse type must be correct for the local mains supply as detailed in Fig 11.

❑ The drive assembly has one fuse, F2 ❑ Each amplifier has two fuses, F3 and F4.

Earth

Line

Neutral

Holder for spare fuse (not supplied)

For a mains input in the range 110 to 240 Vac, fuses F3 and F4 should be rated T6.3AH, 250V.

For a mains input in the range 110 to 24 should be rated T3.15AH, 250V.

F3 and F4 (amp lif ie r )

FS2

F2 (drive assembly)

Spare Fuse

Fig 11 ac Input Fuses

0 Vac, fuse F2

T6T 300 Watt VHF Transmitter Page 71 Installation

Page 72

Fitting the Drive Assembly and Amplifiers into an Equipment Cabinet

Caution Mechanical Support

It is essential that the chose n mechan ical installation provides a dequate s upport along the depth (front to rear) of the unit. The transmitter must not be supported by the front panel; doing so can cause damage.

The drive assembly and the three associa ted ampl ifiers, which occupy 14 U of cabinet space, should be installed in an equipment cabinet in the order shown here.

Amplifier 1 (4 U)

The amplifiers are identical and are designated by the numbers 1, 2 and

Amplifier 2 (4 U)

3 for connection purposes only.

Amplifier 3 (4 U)

Drive Assembly (2 U)

The drive assembly and am plifiers can be installed on telescopic slide s, or on fixed runners, within a standard 483 mm (19 inch) equipment cabinet. M 4 tapped holes, each 10 m m deep (see Fig 12) are provided on each side of the equipment to accept the slides. Details of suitable telescopic slides and fixed runners are available from Park Air. Slide fittings (in this case for an amplifier) are shown in Fig 12.

When fitted in the cabinet, the units’ front panels must be secured to the cabinet’s chassis using four M6 x 16 mm screws and plastic washers.

Item Description

Amplifier

Inner slide

M4 wavy washer

M4 x 8 mm half-head bolt

Descrip tion

Item

Transmitter

Inner Slide

M4 Wavy Washer

M4 x 8 mm Half Head Bolt

Fig 12 Slide Fittings

T6T 300 Watt VHF Transmitter Page 72 Installation

Page 73

Connecting the Amplifiers to the Drive Assembly

Having fitted the drive assemb ly and amplifiers into a cabinet, the units must be interconnec ted, as shown in Fig 17, us ing the supplied phasing harness, part number 17L13000006. The connection s that must be made are listed in Table 15. Fig 13 shows the amplifier rear panel connectors CN5 and CN8. Fig 14 shows the drive assembly rear panel and Amplifier Out connectors.

Table 15 Amplifier/Drive Assembly Interconn ections

Drive Assembly Amplifier 1 Amplifier 2 Amplifier 3

CN1 CN4

CN2 CN5

CN8 CN5

CN3 CN6

DANGER HIGH RF VOLTAGES

CONNECT BEFORE USE

DANGER HIGH

RF VOLTAGES

CONNECT BEFORE USE

CN8 CN5

RATINGS

AC SUPPLY

48-62Hz

POWER 80 0VA max

DC SUPPLY

DANGER HIGH RF VOLTAG ES

CONNECT

ANTENNA

BEFORE

USE

ANTENNA

21.6-32V 28 A

SEE INSTALLATION IN STRUCTIONS BEFORE

CONNECTING SUPP LIES

DISCONNECT SU PPLIES WHEN NOT IN USE

SUPPLY

FUSE F3 / F4

110-240V T4A 250V IEC 110-120V T4A 125V U L

FUSE F1 / F2

F15A 32V

FACILITIES

Fig 13 100 Watt Amplifier Rear Panel Showing CN5 and CN8

CN8 CN5

FUSE F3 FUSE F4

~ AC SUPPLIES

DC SUPPLI ES

FUSE F2

FUSE F1

AMPLIFIER OUT

ANTENNA DANGER HIGH RF VOLTAGES

CONNECT ANTENNA

BEFORE

USE

CN6

CN5

CN4

T1/E1 HDLC

MARC

DATA

MARC AUDIO

MARC FACILITIES

RATINGS

AC SUPPLY

48 - 62Hz

~ 110 - 240V ( +10%) 4A

POWER 400VA m ax

DC SUPPLY

21.6 - 32V 10A

SEE INSTALLATION INSTRUCTIONS BEFORE

CONNECTING SUPPLIES

DISCO NN E CT SU P PLI ES WH EN NOT IN US E

CN3

CN2

CN1

FUSE F2

110-240V T4A 25 0V IEC

110V - 120V T 4A 125V U L

FUSE F1

F15A 32V

SUPPLY

FUSE F1

AC SUPPL Y

FUSE F2

DC SUPPLY

Fig 14 Drive Assembly Rear Panel Showing Amplifier Ou t Connectors

T6T 300 Watt VHF Transmitter Page 73 Installation

Page 74

Fitting and Connecting the Combiner

Fitting

The combiner, shown in Fig 15, should be mounted at the back of the cabinet directly behind the amplifiers’ fans and with the heatsink pointing into the cabinet. Cabinet moun ting holes are provided in the combiner’s bracket to allow fixing to a cabinet upri ght. Fig 16 shows a plan v iew of the mounting arrangement.

Heatsink

Cabinet Mounting Holes

Bracket fits to upright at rear of cabinet

Fig 16 Combiner Mounting Arrangement Plan View

Fig 15 Combiner

Front of Cabinet

Amplifier

Fans

Heatsink

Combiner

Airflow

T6T 300 Watt VHF Transmitter Page 74 Installation

Page 75

Connecting

A coaxial cable connects e ac h am plifier to the com biner’s three i nputs (marked IN) as shown in Fig 17. These cables are part of the phasing harness, part number 17L13000006.

Caution

Critical Length Cabl es

The cables used to connect from the am plifiers to the combiner are critical length. Use only the cables supplied by Park Air.

Connecting the Antenna

The combiner’s antenna connector is an N-type socket suitable for connecting a 50 ohm antenna.

WARNING

The antenna used with the transmitter must be installed such that the resultant radiated field strength is below 10 W/m² in areas normally accessible to personnel.

The RF field strength from the antenna can be predicted from the equation S=1.4PG/4πR

[Where S = power density; P = power in put to ant enna ; G = antenna gain; R = distance to centre of radiation and 1.4 = multiplication factor for average power based on a modulation index of 90%.]

Based on this formula for a 300 watt transmitter and using a 0 dBi antenna, the predicted s afe distance from the centre of radiation would be approximately 1.8 m for a field strength of 10 W/m (1 mW/cm2).

Antenna Radiation

(0.2 mW /cm2) which increases the minimum safe distance to 4.1 m.

T6T 300 Watt VHF Transmitter Page 75 Installation

Page 76

CN8

Amplifier 1

Antenna

CN5 Facilities

CN8

CN5 Facilities

CN8

CN5 Facilities

CN3

Antenna

Amplifier 2

Antenna

Amplifier 3

Antenna

Drive Assembly

Combiner

1 2

Ant

Phasing Harness

(17L13000006)

CN2

CN1

CN6

CN5

CN4

Fig 17 300 Watt Transmitter Interconnections

T6T 300 Watt VHF Transmitter Page 76 Installation

Page 77

Connecting the Chassis Stud

WARNING Chassis Earth

A chassis stud is fitted to each amplifier’s rear panel and to the drive assembly. This stud is used to connect the equipment to the equipment cabinet, or to the user's system earth point. The stud must not be used as the safety earth.

In order not to compromise the transmitter’s Electro magnetic Compatibility (EMC) the chassis stud, marked and fitted to the rear panel must be connected to the equipment cabinet (if a cabinet is being used) or to the user's system earth point. The connection should be made using a single tri-rated, greenand-yellow cable having a cross-sectional area of 2.5 mm

. The cable should h ave CSA and UL1015 approval, and be connected to the chassis stud through an M6 eyelet (for example, Park Air part number 20-08010103).

Failure to comply with this instruction could result in non-compliance with the European

Commission EMC Directive 89/336/EEC.

Connecting the DC Input Supply

The transmitter operat es from e ither an ac, o r a dc input supply. W hen both ac and dc are connect ed, operation from the ac supply takes priority; automatic change -over to the dc supply occurs if the ac supply fails. On restoration of the ac supply, the equipment reverts to ac operation.

Two dc input supply connectors (see Fig 18) are used on each amplifier and one on the drive assembly. The recommended m inimum rating of the dc supply cables is: 2-core having a cross -sectional area of

1.5 mm

per core. The supply cables should be fitted with XLR 3-pin connectors (Park Air part number

20-01030106).

Positive Negative

Pin-out of DC connector looking into the mating face of the chassis mounted socket.

Not used

Fig 18 DC Connectors

T6T 300 Watt VHF Transmitter Page 77 Installation

Page 78

Connecting the AC Input Supply

WARNING Dangerous Voltage

The equipment is perman ently connected to the mai ns supply when the mains connectors are attached. Switching the rear panel Supply switch to off does not isolate all internal circuits from the mains supply. Fo r this reason, a mains isolating switch should b e fitted close to, and easily accessible from, the tran smitter's position. The isolation switch should isolate both live and neutral supplies to the IEC connectors fitted to the drive assemb ly and amplifiers, be clearly labelled, and adequately rated to protect the equipment.

WARNING Earth Connection

This equipment must be earthed. The earth terminal of the ac connector should be used as the safety earth.

Two ac input connectors are fitted to each amplifier rear panel, and one to the drive unit rear panel. The cables used to connect between the equipment and the ac power source should be 3-core (to IEC 227) rated 250 Vac at 8 amps, and have a minimum cross-sectional area of 1.0 mm recommends the use of polyvinyl chloride (PVC) insulated cable. The cable must be fitted with the IEC approved equipment connector and conform to the following specification:

per core. Pa rk Air

❑ If PVC insulated, be not lighter than ordinary polyvinyl chloride shea thed flexible cord according

to IEC publication 227 (designation H05 VV-F, or H05 VVH2-F)

❑ If rubber insulated, be of synthetic rubber and not lighter than ordinary tough rubber-sheathed

flexible cord according to IEC publication 245 titled ‘Rubbe r Insulated Cables of Ra ted Voltages up to and Including 450/750 V (designation H05 RR-F)’.

The T6T 300 W transmitter is a Cl ass 1 equipment. The ac supply cables shou ld have a green-andyellow protective earthing conductor electrically connected to the protective earthing terminal of the equipment connector and the mains plug. Park A ir recommends the ac supply cable is colour coded in accordance with the electrical appliance (colour code) regulations for the UK. That is:

❑ The core coloured green-and-yellow must be

connected to the terminal in the plug that is

Earth

Line

marked with the letter E or by the earth symbol or coloured green-and-yellow

❑ The core coloured blue must be connected to

the terminal that is marked with the letter N or

Neutral

coloured black

❑ The core coloured brown must be connected to

the terminal that is marked with the letter L or

Fuse

FS2 Spare

coloured red.

T6T 300 Watt VHF Transmitter Page 78 Installation

Park Air Systems B63300HS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual