Park Air Systems B6350 50W VHF Ground to air transmitter User Manual T6T User Guide vp

Park Air Systems Limited 50W VHF Ground to air transmitter T6T User Guide vp

Exhibit D User guide

T6T Transmitter User GuideIssue 1
Handbook Title: T6T Transmitter User GuideHandbook Part Number: 31-360000TXIssue Number: 1Date of Issue: November 1999Published By: Park Air ElectronicsNorthfieldsMarket DeepingPeterboroughEngland PE6 8UETelephone: From UK, 01778 345434From outside UK, 44 1778 345434Fax: From UK, 01778 342877From outside UK, 44 1778 342877Page ii
Handbook Amendment RecordAmendments to this handbook, originated by Park Air Electronics, are listed in the following table.AmendmentNumber Date Brief Details PAE ChangeNote NumberEquipment Modification RecordModifications to the T6T transmitter are detailed in the following table.The equipment’s modification label shows modifications embodied in the equipment.ModificationNumber Date Brief Details PAE ChangeNote NumberPage iii
List of AbbreviationsThe following abbreviations are used in this user guide:Page ivA ampAM amplitude modulationBIT built-in testdB decibelDSP digital signal processingETI elapsed time indicatorICAO international civil aviation organisationkg kilogramkHz kilo HertzLCD liquid crystal displaymA milliampMARC multi-access remote control systemMHz mega Hertzmm millimetreppm parts per millionPSK phase shift keyingrms root mean squareRSSI receiver signal strength indicationV voltVFP virtual front panelVHF very high frequency
T6T Transmitter User GuideSection 1General Information
Section 1 T6T Transmitter User GuidePage 2Section 1 ContentsChapter 1. OverviewIntroduction to the T6T Transmitter 3T6T Handbooks 3Operational Settings 4Virtual Front Panel 5Built-In Tests 5Transmitter Variants 6Configuring the T6T Transmitter 6Chapter 2. SpecificationDimensions and Weight 9RF Characteristics 9Environmental 10Power Requirements 10Chapter 3. Controls, Indicators, and ConnectorsFront Panel 11Transmit Indicator 11Alarm Indicator 11Ready Indicator 11Standby Indicator 12Reference Connector 12Microphone/Diagnostics Connector 12Scroll/Select Switch and LCD 13Rear Panel 14Power Switch 14AC Input Connector 14DC Input Connector 15Fuse F1 15Chassis Stud Connection 15Facilities Connector CN5 15MARC Port CN6 16Computer Port CN7 16Antenna Connector 16Chapter 4. Installation ProceduresIntroduction 21Initial Inspection of the Transmitter 22Fitting the Correct AC Input Fuse 22Selecting the Correct AC Input Tap 23Selecting the Keying Method 24Fitting a Radio into an Equipment Rack 25Connecting Remote Facilities 25Chassis Stud Connection 26AC Supply Connection 26DC Supply Connection 27Connecting an Antenna 27Switching On 27Page
Chapter 1. OverviewThis chapter provides an introduction to the T6T transmitter, briefly describes the features, andshows how the radio is configured for operational use.INTRODUCTION TO THE T6T TRANSMITTERPark Air Electronics (PAE) T6T is a VHF multi-mode air-traffic control transmitter compatible withanalogue (AM) and digital (D8PSK) modulation modes. Current models are supplied programmed forAM voice operation in the frequency range 118 to 136.975 MHz using 25 kHz or 8.33 kHz channelspacing. Future software upgrades will allow D8PSK operation.The transmitter produces a 50 watt carrier output that can be reduced, in 1 watt steps, to 5 watts. Theoutput power, and the majority of operational settings, can be selected at the front panel, using the virtualfront panel (VFP) or through a compatible control and data system such as the PAE multi-access remotecontrol (MARC) system.A multi-channel feature allows up to 100 frequency channels to be stored and recalled by channelnumber.The transmitter is designed to be fitted in an industrial 19 inch (483 mm) equipment rack. Operation isfrom either a standard ac mains supply, or from a low voltage dc supply. When both input supplies areconnected, the dc supply acts as a back-up if the mains supply fails.Comprehensive continuous and interruptive Built-In Tests (BIT) provide confidence of the transmitter'sserviceability.T6T HANDBOOKSThis user guide describes the T6T transmitter and gives complete installation and setting up procedures.The user guide is split into sections as follows:Section 1. Section 1 (this section) provides general information that is common to alloperating modes.Section 2. Section 2 provides information that is specific to operating the T6T transmitterin AM-voice mode.Section 3. Section 3 onwards will, when available, describe the digital operating modes.A maintenance kit (PAE part number 70-6350MKIT) is also available. A maintenance handbook,included in the kit, contains fault finding guides to module level and details VFP operation. The VFP canbe used for setting up, maintenance purposes, and for loading new software.The maintenance kit includes a CD-ROM containing the VFP software and a lead for connecting theradio to a Personal Computer (PC). The CD-ROM also contains the software as loaded into the T6T atthe time of sale. This enables the original software to be re-loaded if the transmitter's Digital SignalProcessing (DSP) module is ever replaced.Both the user guide and maintenance handbook are available on CD ROM. Contact PAE for details.T6T General Information Section 1Page 3T6T transmitter maintenance should not be attempted without referenceto the maintenance handbook
OPERATIONAL SETTINGSOperational settings for the T6T transmitter are configured at the front panel, through the VFP, orthrough an associated MARC system (or compatible control and data system). At the transmitter,operational settings are selected and displayed using the front panel Scroll/Select switch and the LCD.The settings are selected through a series of menus. Full details are given in the section of this userguide applicable to the operating mode. Two example selection menus, Set Frequency menu andChannel Storage menu, are shown below.121 . 500MHzCance l OKCh100 121 . 500MHzCance lStoreStore and EndDuring normal transmitter operation, the Main screen, shown below, is displayed. The screen shows theoperating frequency, the channel number (if the channel store facility is used), the carrier offset (if used inAM-voice mode), and displays a graphical representation of instantaneous peak power.Freq 123 . 000MHzChan 1Offset +5.0kHzPwr IIIIIIIIIIIISection 1 T6T Transmitter User GuidePage 4Freq 123.000MHzChan 1Offset +5.0kHzPwr lllllllllllExample MainScreenExample SetFrequency MenuExample ChannelStorage Menu
Virtual Front PanelAs an alternative to setting up the transmitter from the front panel, the T6T's virtual front panel (VFP)software can be used. To use the VFP, an IBM™ compatible PC must be connected to the transmitter(see Fig. 1-1). Using the VFP offers several advantages over setting up from a transmitter's front panel.These are:qWhen set up using the VFP, a profile of the transmitter's operational settings can be created.The profile can then be used to automatically set up other radios within a system, or to reset aradio should its DSP module ever be replaced.qWhen using the VFP, the transmitter's front panel can be locked. This means that atransmitter's settings cannot inadvertently be changed by tampering with the front panelcontrols.qA print-out of a transmitter's profile (all the operational settings) can be made from the VFP.Instructions on VFP usage is outside the scope of this user guide. Reference, therefore, should be madeto the T6T maintenance handbook that is supplied with a CD-ROM containing the VFP software.BUILT-IN TESTSThe transmitter continuously self monitors key internal parameters without affecting normal operation. Ifa BIT fault is detected, the front panel Alarm indicator lights, the Ready indicator becomes unlit, and thetransmitter becomes inoperable.Additionally, a BIT warning, as opposed to a BIT fault may be indicated. A BIT warning is shown by thefront panel Alarm indicator flashing; the Ready indicator remains lit and the transmitter remainsoperational, but at reduced power.Apart from continuous monitoring, an interruptive BIT test can be initiated locally at the front panel, orremotely. When initiated, test signals are injected that key the transmitter allowing parameters to bemonitored in their active state.The results of continuous monitoring, and of interruptive testing, are available at the front panel LCD.When the transmitter is used with a MARC system (or other compatible data and control system) theresults are also sent, in the form of a data message, to the monitoring facility. A full description of the BITfacilities is given in the section applicable to the required operating mode. The following two illustrationsshow example front panel BIT displays.T6T General Information Section 1Page 5VSWR PASSPA T emp 8 0 °CSyn t h Lock Pass<< >>RF D r i v e PASSFwd Powe r 2 5WRf l Power 2W<< >>
TRANSMITTER VARIANTSTwo variants of the T6T transmitter are available:qB6350. This model operates in all modes except in AM-voice when using a 5-carrier offset.The frequency stability of this model is 1 ppm.qB6350OPT1. This model operates in all modes including AM-voice when using a 5-carrieroffset. The frequency stability of this model is 0.25 ppm.CONFIGURING THE T6T TRANSMITTERFig. 1-1 shows the signal connectors fitted to the transmitter's front and rear panels. The connectorsused to configure the transmitter depend on the required operating mode. The purpose of eachconnector is briefly described in the following paragraphs and fully detailed in chapter 3 starting onpage 11.Antenna Connector Used in all operating modes to connect the 50 ohm antenna feedercable.Microphone/DiagnosticsConnectorThis is a dual purpose connector. A microphone/headset (complete withintegral PTT switch) can be connected to enable local AM-voiceoperation.Alternatively, a PC can be connected to allow use of the VFP. The VFPcan be used to set the transmitter's operational settings, or to downloadnew software.Reference Connector Used in all operating modes to check and reset the transmitter'sreference frequency.Facilities Connector Used primarily to connect remote signals when using AM-voice modewhen the transmitter does not form part of a MARC system.Some auxiliary signals available at this connector, for example the24 volt (nominal) unregulated output supply, can be utilized irrespectiveof the operating mode.MARC Port The MARC port is used to connect remote signals when the transmitterforms part of a MARC system, or other compatible control and datasystem.Computer Port The computer port is used in digital communication modes to connectthe transmitter to a control computer.Section 1 T6T Transmitter User GuidePage 6
T6T General Information Section 1Page 7Fig. 1-1. T6T Transmitter ConfigurationT6T TransmitterAntennaConnectorMicrophone/DiagnosticsConnectorMicrophone/headsetfor local AM operation.PC to allow use of the VFPand to download newsoftware.ReferenceConnectorFrequency counter formaintenance purposes.FacilitiesConnectorRemote Signals.ComputerPortSignals to/from a controlcomputer. Used whenoperating in digitalcommunication modes.MARCPortSignals to/from anRSE 2 equipment. Usedwhen the radio formspart of a MARC system.
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Chapter 2. SpecificationThis chapter contains the T6T transmitter's specification that is common to all operating modes.Specifications relevant to specific operating modes are contained in the section applicable to therequired operating mode.DIMENSIONS AND WEIGHTThe dimensions and weight of the T6T transmitter are:Width 483 mm (19 inches).Height 88.9 mm (3.5 inches). The height occupies 2U ofequipment cabinet space.Depth (front panel to rear panel) 430 mm (16.9 inches).Depth (front panel to rear of fan) 450 mm (17.7 inches).Weight 15.6 kg (34.4 pounds)RF CHARACTERISTICSFrequency range 118 to 136.975 MHz.Output carrier power The output power is adjustable between 5 and 50 watts.Number of channels The transmitter has a multi-channel capability.100 channels can be stored and recalled.Frequency accuracy Better than 1 ppm for transmitter B6350.Better than 0.25 ppm for transmitter B6350OPT1.Protection Excessive VSWR. The transmitter will transmit at fullpower into a VSWR of up to 2.5 :1. At a higher VSWRthe output power will be reduced by 10 dB ±1 dB, ifnecessary, in order to protect the transmitter.Provision is made via the facilities port to allow anexternal VSWR signal to be monitored. This is requiredwhen isolators are employed which shield the transmitterfrom a VSWR fault at the antenna.PA Overheating. If the RF PA temperature exceeds80°C, the output power is reduced by 6 dB ±1 dB and aBIT warning indicated.If the RF PA temperature exceeds 90°C the transmitterde-keys and a BIT alarm is indicated.T6T General Information Section 1Page 9
Control Loop Error. If the cartesian control loop goesout of limits, for example, due to low supply volts, theoutput power gradually reduces by up to 3 dB until theloop regains stability. If this fails to stabilise the loop thetransmitter de-keys and a BIT alarm is indicated.Harmonic outputs Harmonic outputs are below -36 dBm.ENVIRONMENTALTemperature range The transmitter operates to specification at temperaturesbetween -20 and +55°C and at a relative humiditybetween 5% and 90% (non-condensing).Duty cycle 100%.Warm up time The transmitter is fully operational 5 seconds afterswitch on.Storage The transmitter can be stored at temperatures between-30 and +70°C without causing damage.Cooling The transmitter has an integral cooling fan.POWER REQUIREMENTSThe transmitter operates from an ac input supply, or a dc input supply. When both supplies areconnected, the dc input acts as an automatic backup supply for the ac mains.ac input supply The transmitter operates from a 48 to 62 Hzsingle-phase ac supply.The input voltage, measured at the equipment, can be110/120/220/230/240 V ac (± 10%). The correct acinput tap must be selected to suit the input voltage.Additionally, the correct ac input fuse F2 must be fitted.See installation detail on page 23.ac power consumption Typically 330 VA. 500 VA maximum.dc input supply Between 21.6 and 32 V. Full output power capability ismaintained with a dc input between 24 and 32 V. From24 down to 21.6 V the output power graduallydecreases.dc supply current 15 amp (maximum) with a 28 volt dc input supply.Section 1 T6T Transmitter User GuidePage 10
Chapter 3. Controls, Indicators, and ConnectorsThis chapter details the purpose of all controls, indicators, and connectorsfitted to the transmitter's front and rear panels.FRONT PANELThe front panel's controls, indicators, and connectors are shown below and described in the followingparagraphs.Transmit IndicatorAn amber indicator that lights when the transmitter is keyed and producing output power.Alarm IndicatorA red indicator that either flashes, or lights, when a BIT fault has been detected. BIT indications areclassified as either warnings or faults.If a warning is detected, the Alarm indicator flashes, the Ready indicator remains lit, and the transmitterremains operational. A BIT warning is indicated if:qa high PA temperature is sensedqa high VSWR is sensed.If a fault is detected, the Alarm indicator lights and the Ready indicator becomes unlit; the transmittercannot be used.Ready IndicatorA green indicator that lights when the transmitter is ready for use and no BIT faults have been detected.T6T General Information Section 1Page 11Freq 123.000MHzChan 1Offset +5.0kHzPwr lllllllllll
Standby IndicatorA red indicator that lights when the transmitter is in standby mode. When in standby mode, most of thetransmitter'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, byinitiating an instruction through a MARC system, or through the VFP. Details of front panel selection anddeselection are given in the section of this user guide applicable to the particular operating mode.Reference ConnectorAn SMB jack socket that allows a high impedance frequency counter to monitor the transmitter'sreference frequency. This connector is used only for maintenance purposes. The instructions forchecking and adjusting the reference frequency are given in the T6T maintenance handbook.Microphone/Diagnostics ConnectorA dual purpose connector that allows either a dynamicmicrophone (and headset if sidetone is required) or a PC to beconnected to the transmitter. The connector is a 7-pin selflocking DIN socket.A microphone/headset with integral PTT switch can be fitted tothis connector to enable the transmitter to be operated in localmode. The connections are detailed in table 1-1. A PC can alsobe connected to allow the VFP to be displayed. Using the VFP isdetailed in the T6T maintenance handbook. The connections atthe transmitter are shown in table 1-2.Table 1-1. Microphone/Headset ConnectionsHeadset/DiagnosticsConnector Pin Number Signal Notes1 Microphone ground 0 volt.3 Microphone PTT 0 volt = PTT. 5 V pull-up = not PTT.5 Sidetone to headset 200 ohm output impedance.Maximum = 3 volt peak-to-peak.6 Microphone input 6.8 kohm, 5 mV sensitivity.Section 1 T6T Transmitter User GuidePage 12Fig. 1-2.Microphone/DiagnosticsConnector Pin-Out(DEV083-05)
Table 1-2. Diagnostics PC ConnectionsHeadset/DiagnosticsConnector Pin Number Signal Notes2 Transmit data RS2324 Receive data RS2327 Ground 0 voltScroll/Select Switch and LCDThe Scroll/Select switch is used in conjunction with the LCD to select most of the transmitter'soperational settings. Use of the switch and LCD is fully detailed in the section of this user guideapplicable to the particular operating mode. During normal operation, the LCD shows the operatingfrequency, the channel number (if the channel store facility is used), the carrier offset (if used), anddisplays a graphical representation of instantaneous peak power.The example LCD screen below shows the transmitter operating on 123.000 MHz; the frequency hasbeen preset as channel 8; and no offset is used.Freq 123 . 000MHzChan 8Pwr IIIIIIIIIIIIT6T General Information Section 1Page 13
REAR PANELThe rear panel's controls, indicators, and connectors are shown in Fig. 1-3 and described in the followingparagraphs.Power SwitchA 2-way rocker switch used to switch on, and switch off, power to the transmitter's circuitry.l=OnWARNING!When the POWER SWITCH is set to the Off position, lethal voltages are still present in thetransmitter's internal power supply circuitry. To ensure safe working, the ac and dc inputsupplies must be disconnected from the transmitter.AC Input ConnectorA 3-pole IEC chassis plug for connecting the ac inputsupply. The plug has an integral 20 mm fuse (F2) thatprotects the Line (L) input circuit. The fuse is rated at4 amps. Detailed instructions regarding fuse types,and connecting the ac supply are given in theinstallation chapter on page 26.Caution!Before connecting an ac input supply to thetransmitter, the ac input taps must be set to suitthe local mains supply (see page 22).Section 1 T6T Transmitter User GuidePage 14(DEV083-02) Fig. 1-3. Rear Panel= OffFig. 1-4. AC Mains Connector(SA3536)
DC Input ConnectorA 3-pole chassis plug for connecting the dc input supply.Detailed instructions for connecting the dc supply are givenin the installation chapter of this handbook on page 27.Fuse F1Fuse F1 protects the dc input positive supply circuit. It is a Size 0 fuse rated at 15 amps. The PAE partnumber of the fuse is: 29-01350201.Chassis Stud ConnectionThe chassis stud is used to provide a common earth point between the transmitter and the associatedequipment rack, or the transmitter and the user's system earth. The stud must not be used as a safetyearth. Connection details are given on page 26.Facilities Connector CN5A 15-way D-type socket used primarily to connect remote signals when the transmitter operates in AMmode and does not form part of a MARC (or similar) system. The pin-out of this connector is given intable 1-3 on page 17.Apart from allowing connection of remote signals, this connectormakes some auxiliary signals available to the user. For example, a24 volt (nominal) unregulated output supply. The auxiliary signalscan be employed by the user as and when required irrespective ofthe operating mode.Facilities connector CN5 as seen when looking at the rear panel.Connections should be made using a 15-way D-type plug PAE partnumber: 20-01150100 (plug), and 20-09150101 (cover). These aresupplied with the transmitter as item 3 (see page 22).T6T General Information Section 1Page 15Fig. 1-5. DC Connector(DEV083-06)Fig. 1-6. Facilities ConnectorCN5 Pin-Out
MARC Port CN6A 9-way D-type socket used to connect remote signals to a MARC system or other compatible controland data system. The pin-out of this connector is given in table 1-4 on page 18.Computer Port CN7A 25-way D-type socket used to connect the transmitter to a control computer when the transmitter isoperated in digital communication modes. The pin-out of this connector is given in table 1-5 on page 19.Antenna ConnectorAn N-type 50 ohm coaxial socket used to connect the antenna's feeder cable.Section 1 T6T Transmitter User GuidePage 16Fig. 1-7 MARC Port CN6 Pin-OutMARC connector CN6 as seen when looking at the rear panel.Connections should be made using a 9-way D-type plug PAE partnumber: 20-01090100 (plug), and 20-09090101 (cover).Fig. 1-8 Computer Port CN7 Pin-OutComputer port CN7 as seen when looking at the rear panel.Connections should be made using a 25-way D-type plug PAE partnumber: 20-01250100 (plug), and 20-09250101 (cover).
Table 1-3. Facilities Connector CN5 Pin-OutPinNumber Signal Name Description1 Ground 0 volt.2 Line In (+) Pins 2 and 3 present a 600 ohm balanced audio input to thetransmitter for use in AM modes. The input level is adjustablebetween -40 dBm and 0 dBm. Phantom keying can besuperimposed on the audio lines. See ‘Selecting the ApplicableKeying Method’ in section 2 on page 10.3 Line In (-)4 External VSWRAn input signal to the transmitter to indicate a VSWR fault in theantenna circuit. When this signal is active, the transmitter's outputpower is reduced by 10 dB and a VSWR warning is indicated. Thisis a TTL input pulled-up to 5 V; the active signal is 0 volt.5AntennaChange-OverAn output signal that can be used to control an antennachange-over relay when the transmitter is used in conjunction with aT6R receiver. Antenna change-over is a grounding output; theactive (transmitter keyed) polarity is always the same as the PTToutput signal on pin 6. Maximum current sink is 100 mA.6 PTT OutputThis output, when active, indicates the transmitter is keyed. It is agrounding output. The active polarity is set from the front panel.Maximum current sink is 100 mA.7 Remote PTTAn input signal used to key the transmitter. The active signal can be0 volt, or a dc level between +10 and +50 volt, or a dc level between-10 and -50 volt. Internal jumpers JP8 and JP9 must be correctly set tosuit the required keying potential (see ‘Remote Keying Configurations’in section 2 on page 11). The active polarity is set from the front panel.8 Ground 0 volt.9 Unregulated Supply A dc output supply between 21.6 and 32 volt. The supply is fusedat 500 mA.10 Tx InhibitThis input signal, when active, prevents the radio from beingkeyed. This is a TTL input pulled-up to 5 V; the active polarity is setfrom the front panel.11 BIT Interruptive TestAn input signal that initiates a BIT interruptive test. This is a TTLinput pulled-up to 5 V. The active polarity of this signal is set fromthe front panel. The input signal must be active for a minimum of300 ms; the signal cannot then be activated again for at least3 seconds.12 Not Used Pin 12 is internally connected. Do not make any connections tothis pin.13 Ready OutputThis output is active when the radio is ready to transmit and nofaults have been detected by the BIT circuitry. It is an opencollector output. The active polarity is set from the front panel.14 Tape Output An audio output for connection to a recording system. The outputis nominally -10 dBm into 100 ohm.15 Not Used -T6T General Information Section 1Page 17
Table 1-4. MARC Connector CN6 Pin-OutPinNumber Signal Name Description1 Ground 0 volt.2 Line In (+) Pins 2 and 3 present a 600 ohm balanced audio input to thetransmitter for use in AM modes. The input level isadjustable between -40 dBm and 0 dBm. Phantom keyingcan be superimposed on the audio lines. See ‘Selecting theApplicable Keying Method’ in section 2 on page 10.3 Line In (-)4 PTTAn input signal used to key the transmitter. The activesignal can be 0 volt, or a dc level between +10 and +50 volt,or a dc level between -10 and -50 volt. Internal jumpers JP8and JP9 must be correctly set to suit the required keyingpotential (see ‘Remote Keying Configurations’ in section 2on page 11). The active polarity is set from the front panel.5 Unregulated SupplyA dc output supply between 21.6 and 32 volt. The supply,which is fused at 500 mA, is used as the power source forthe MARC RSE 2 equipment.6 Data In (+) RS422 data line.7 Data In (-) RS422 data line.8 Data Out (+) RS422 data line.9 Data Out (-) RS422 data line.Section 1 T6T Transmitter User GuidePage 18
Table 1-5. Computer Port CN7 Pin-OutCN7 Pin Number Signal Name Level Input or Output1 Ground 0 volt -2 Serial 0 TXA RS422 Output3 Serial 0 TXB RS422 Output4 Serial 0 RXA RS422 Input5 Serial 0 RXB RS422 Input6 Serial 0 CLA RS422 Output7 Serial 0 CLB RS422 Output8 Serial 1 TXA RS422 Output9 Serial 1 TXB RS422 Output10 Serial 1 RXA RS422 Input11 Serial 1 RXB RS422 Input12 Serial 1 CLA RS422 Output13 Serial 1 CLB RS422 Output14 Input A RS 232 Input15 Input B RS232 Input16 Input C RS232 Input17 Input D RS232 Input18 Output A RS232 Output19 Output B RS232 Output20 Output C RS232 Output21 Output D RS232 Output22 Ground 0 volt -23 Not used - -24 Not used - -25 Not used - -T6T General Information Section 1Page 19
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Chapter 4. Installation ProceduresThis chapter details the installation procedures for a T6T transmitter that are necessary irrespective ofwhich operating mode is to be used.WARNING. LETHAL VOLTAGES!The instructions given in this chapter involve connecting lethal voltages to thetransmitter. The instructions detailed in this chapter must be carried out only by suitablyqualified personnel.WARNING. ANTENNA RADIATION!The antenna used with the transmitter must be installed such that the resultant radiatedfield strength is below 10 W/m² in areas normally accessible to personnel.WARNING. BERYLLIUM/BERYLLIA!The equipment covered by this handbook contains components containing the highlytoxic material Beryllium and/or its oxide Beryllia. These materials are particularlyhazardous if:1. Beryllium materials are absorbed into body tissues through the skin, mouth,or wound.2. The dust created by breakage of Beryllia is inhaled.3. Toxic fumes are inhaled from Beryllia/Beryllium involved in a fire.The components containing Beryllia/Beryllium are: TR5, TR6 and TR9 in thePA module.WARNING. UNAUTHORIZED MODIFICATIONS!Changes or modifications made to this equipment that are not expressly approved byPark Air Electronics, or parties authorized by Park Air Electronics, could void the user’sauthority to operate the equipment.CAUTION. ESSDs!The T6T transmitter's circuitry contains Electrostatic Sensitive Devices (ESSDs).Personnel must be aware of the precautions necessary to prevent damage to suchdevices. During installation all precautions necessary to prevent ESSD damage must betaken.INTRODUCTIONThe procedures in this chapter describe how to install a T6T transmitter. The procedures necessaryduring installation are listed in table 1-5 and should be completed in the order shown.T6T General Information Section 1Page 21
Table 1-5 Installation ProceduresProcedure Reference1 Perform an initial inspection of the transmitter. Page 222 Fit the correct ac input fuse. Page 223 Select the correct ac input tap. Page 234 Selecting the keying method (AM-voice only) Page 245 Fit the transmitter into an equipment rack. Page 256 Connecting remote facilities Page 257 Connect the chassis stud to the rack or system earth. Page 268 Connect the ac input supply (if applicable). Page 269 Connect the dc input supply (if applicable). Page 2710 Connect an antenna. Page 27INITIAL INSPECTION OF THE TRANSMITTEROn receipt of the transmitter from PAE, remove all transit packaging and check that there is no transitdamage. If damage is evident, contact PAE immediately and retain the original transit packaging.The following items should be included with the transmitter:Item 1. One copy of the T6T User Guide (this handbook).Item 2. An unterminated IEC mains connector.Item 3. An unterminated 15-way D-type plug (for use with the rear panel Facilitiesconnector CN5).FITTING THE CORRECT AC INPUT FUSEThe mains input fuse F2 is an integral part of the rear panel ac connector (the connector and fuse areshown in Fig. 1-4 on page 14). The fuse type must be correct for the local mains supply. Check the fusefitted conforms to that detailed in Table 1-6.Table 1-6 Input AC Fuse RatingMains Input Supply Fuse PAE Part Number110/120 V T4A 125 V UL 29C11120102S220/230/240 V T4A 250 V IEC 127 HBC 29E01120108SSection 1 T6T Transmitter User GuidePage 22
SELECTING THE CORRECT AC INPUT TAPThe correct tap on the input ac transformer must be selected to suit the local mains supply. The taps areselected by configuring connections on the AC Terminal Block. To set the correct tap:a. Release the M3 captive screws that secure the transmitter's top cover. Remove the cover. Referto Fig. 1-9 and identify the AC Terminal Block. Refer to Fig. 1-10 and identify the configuration thatis required for the local ac mains supply.b. Remove the two screws that secure the terminal block bracket as shown in Fig. 1-9.c. Connect the ac wires (brown = Line, and blue = Neutral) to the correct terminals. Connect link(s)as shown in Fig. 1-10.d. If the transmitter is to be operated in AM-voice mode, go to the next procedure. If operating inother modes, refit the top cover.T6T General Information Section 1Page 23Factory default setting. The transmitter is set for a 230 V ac input unless specifiedotherwise at the time of ordering.DEV083-08 Fig. 1-9. Location of Input Tap Terminal Block
SELECTING THE KEYING METHODThis procedure is applicable only to AM-voice mode.A number of different ‘remote’ or ‘phantom’ keying configurations are possible with the T6T transmitter.Internal jumpers must be correctly set to suit the required configuration. To do this, refer to section 2,chapter 3, of this user guide and follow the procedure ‘Selecting the Applicable Keying Method’.Section 1 T6T Transmitter User GuidePage 240 110 120 0 110 120Blue BrownLink240 V ac Input220 V ac Input0 110 120 0 110 120LinkBlue Brown230 V ac Input0 110 120 0 110 120LinkBlue BrownBlueBrown0 110 120 0 110 120Blue LinkBrownLink110 V ac Input0 110 120 0 110 120BlueLinkBrownLinkBlueBrown120 V ac InputFig. 10. Input Tap Selection
FITTING A RADIO INTO AN EQUIPMENT RACKCAUTION!It is essential that the chosen mechanical installation provides adequate support alongthe depth (front to rear) of the unit. The transmitter must not be supported by the frontpanel; doing so can cause damage.The transmitter can be installed on telescopic slides, or on fixed runners, within a standard 483 mm(19 inch) equipment rack. M4 tapped holes, each 10 mm deep (see Fig. 1-11) are provided on each sideof the equipment to accept the slides. Details of suitable telescopic slides and fixed runners are availablefrom PAE.When fitted in the rack, the transmitter's front panel must be secured to the racks chassis using fourM6 x 16 mm screws and plastic washers.CONNECTING REMOTE FACILITIESRemote facilities connections depend on the transmitter's operating mode. To determine the requiredremote connections, refer to chapter 3 of the section applicable to the operating mode.T6T General Information Section 1Page 25Fig. 1-11. Telescopic Slide Fixing Points(DEV083-09)
CHASSIS STUD CONNECTIONWARNING. CHASSIS EARTH!A chassis stud is fitted to the transmitter's rear panel. This stud is used to connect theequipment to the equipment rack, or to the user's system earth point. The stud must notbe used as the safety earth.In order not to compromise the transmitter’s Electromagnetic Compatibility (EMC) the chassis stud,marked and fitted to the rear panel (see Fig. 1-3 on page 14) must be connected to the equipmentrack (if a rack is being used) or to the user's system earth point. The connection should be made using asingle tri-rated, green-and-yellow cable having a cross-sectional area of 2.5 mm2. The cable should haveCSA and UL1015 approval, and be connected to the chassis stud through an M6 eyelet (for example,PAE part number 20-08010103).Failure to comply with this instruction could result in non-compliance with the EuropeanCommission EMC Directive 89/336/EEC.AC SUPPLY CONNECTIONWARNING. LETHAL VOLTAGES!The equipment is permanently connected to the mains supply when the mainsconnector is attached. Switching the rear panel Power switch to off does not isolate allinternal circuits from the mains supply. For this reason, a mains isolating switch shouldbe fitted close to, and easily accessible from, the transmitter's position.WARNING. EARTH CONNECTION!This equipment must be earthed. The earth terminal of the AC connector should be usedas the safety earth.An ac input connector (see Fig. 1-4 on page 14) is fitted to the equipment’s rear panel. The cable used toconnect between the equipment and the user’s ac power source should be 3-core (to IEC 227) rated250 V ac at 8 amps, and have a minimum cross-sectional area of 1.0 mm² per core. PAE recommendsthe use of polyvinyl chloride (PVC) insulated cable. The cable must be fitted with the IEC approvedequipment connector (PAE part number 20-02030102) supplied with the transmitter, and conform to thefollowing specification:qIf PVC insulated, be not lighter than ordinary polyvinyl chloride sheathed flexible cordaccording to IEC publication 227 (designation H05 VV-F, or H05 VVH2-F).qIf rubber insulated, be of synthetic rubber and not lighter than ordinary tough rubber-sheathedflexible cord according to IEC publication 245 titled ‘Rubber Insulated Cables of RatedVoltages up to and Including 450/750 V (designation H05 RR-F)’.The T6T transmitter is a Class 1 equipment. The ac supply cable should have a green-and-yellowprotective earthing conductor electrically connected to the protective earthing terminal of the equipmentconnector and the mains plug. PAE recommends the ac supply cable is colour coded in accordance withthe electrical appliance (colour code) regulations for the UK. That is:qThe core that is coloured green-and-yellow must be connected to the terminal in the plug thatis marked with the letter E or by the earth symbol or coloured green-and-yellow.qThe core that is coloured blue must be connected to the terminal that is marked with the letterN or coloured black.qThe core that is coloured brown must be connected to the terminal that is marked with theletter L or coloured red.Section 1 T6T Transmitter User GuidePage 26
DC SUPPLY CONNECTIONThe transmitter operates from either an ac, or a dc input supply. When both ac and dc are connected,operation from the ac supply takes priority; automatic change-over to the dc supply occurs if the acsupply fails. On restoration of the ac supply, the equipment reverts to ac operation.A dc input supply connector (see Fig. 1-5 on page 15) is fitted to the equipment's rear panel. Therecommended minimum rating of the dc supply cable is: 2-core having a cross-sectional area of 1.5 mm2per core. The supply cable should be fitted with an XLR3 connector (PAE part number 20-01030106).CONNECTING AN ANTENNAThe antenna feeder cable connects to the transmitter’s rear panel N-type antenna connector (seeFig. 1-3 on page 14).SWITCHING ONWhen installation is complete, the transmitter should be switched on at the rear panel Power switch (seepage 14).T6T General Information Section 1Page 27
T6T Transmitter User GuideSection 2AM-Voice Mode
Section 2 T6T AM-Voice OperationPage 2Section 2 ContentsChapter 1. AM-Voice OverviewIntroduction to AM-voice mode 3Carrier Offset Operation 3Operational Settings 4Basic Configuration 4Local Operation 4Remote Operation 5Configuration for Operation with MARC 6Chapter 2. AM-Voice SpecificationRF Characteristics 7Modulation Characteristics 7Chapter 3. AM-Voice InstallationIntroduction 9Selecting the Applicable Keying Method 10Remote Keying Configurations 11Phantom Keying Configurations 12Connecting the Remote Facilities 14Connecting to MARC Equipment 14Chapter 4. AM-Voice Operational SettingsIntroduction 17Normal Operation 17Using the Scroll/Select Switch 17Screen Protocol 18Menu Lock Screen 20Notes for Setting Up the Transmitter 21Front Panel Display for 25 kHz and 8.33 kHz Channel Spacing 21Line Level 22To Enter Standby Mode 23To Exit Standby Mode 24AM Voice Settings Procedure 25General Transmitter Settings 29Setting the Operating Frequency 34Allocating Channel Numbers to Specified Frequencies 35To Recall Channel Frequencies 36To initiate an Interruptive BIT Test 37To View BIT Pages and Advise Screen 38Elapsed Time Indicator 39Displaying the Transmitter's Internal Reference Frequency Screen 40Software Versions Screen 41Page
Chapter 1. AM-Voice OverviewThis chapter provides an introduction to using the T6T transmitter in AM-voice mode.INTRODUCTION TO AM-VOICE MODEIn AM-voice mode, the T6T transmitter operates in the frequency range 118 to 136.975 MHz using25 kHz or 8.33 kHz channel spacing. The transmitter produces a 50 watt carrier output that can bereduced, in 1 watt steps, to 5 watts. The output power, and the majority of operational settings, can beselected at the front panel or through a compatible control and data system such as the PAEMulti-Access Remote Control (MARC) system.A multi-channel feature allows up to 100 frequency channels to be stored and recalled by channelnumber. In AM voice mode, and when 25 kHz channel spacing is used, the transmitter can operate witha 2, 3, 4, or 5 carrier-offset frequency in accordance with ICAO Annex 10.CARRIER OFFSET OPERATIONIn AM voice mode the transmitter can offset the carrier frequency to provide 2, 3, 4, or 5-carrier offset tomeet the requirements of ICAO Annex 10. Offsets are selected using the front panel Scroll/Select controland the LCD display. The offsets are:2-carrier offset: carriers are spaced at ±5 kHz.3-carrier offset: carriers are spaced at zero, and ±7.3 kHz.4-carrier offset: carriers are spaced at ±2.5 kHz and ±7.5 kHz5-carrier offset: carriers are spaced at zero, ±4 kHz and ±8 kHzNote ...For 5-carrier offset operation, transmitter variant B6350OPT1 must be used.T6T AM-Voice Operation Section 2Page 3
OPERATIONAL SETTINGSOperational settings for the T6T transmitter are configured at the front panel, through the VFP, orthrough an associated MARC system (or compatible control and data system). At the transmitter,operational settings are selected and displayed using the front panel Scroll/Select switch and the LCD.The settings that can be selected are:qOperating frequency qSelecting a carrier offsetqSelecting the channel spacing qChannel allocation and recallqSetting the line level qSetting the output powerqStandby mode to on or off qSetting inhibit to on or offqSetting the MARC baud rate qSetting the PTT input signal polarityqSetting the PTT output signal polarity qSetting the inhibit input signal polarityqSetting the BIT initiate signal polarity qSetting the Ready output signal polarityqSetting the antenna change-over signalpolarity qPTT test facilityqSetting the PTT timeout qSetting the modulation depthqMute enable or disable qVogad enable or disableqAdjusting the sidetone volume qSetting the LCD backlightBASIC CONFIGURATIONFig. 2-1 shows the basic T6T transmitter connections for AM voice operation. If the transmitter is part of aMARC system, or other compatible control and data system, refer to ‘Configuration for Operation withMARC’ on page 6.Local OperationIn its simplest configuration, the transmitter can be operated in Local mode. This involves plugging amicrophone with integral PTT switch into the front panel Microphone/Diagnostics connector. Thetransmitter is then operated from the front panel.Section 2 T6T AM-Voice OperationPage 4
Remote OperationFor remote operation signals are connected from the control equipment, through a suitablecommunication link, to the transmitter's rear panel Facilities connector. Essential connections are anaudio input and a keying input. For the keying input, the Remote PTT connection can be used, orphantom keying can be superimposed on the audio lines (see ‘Selecting the Applicable Keying Method’in chapter 3). Other remote signals can be connected to suit the particular application. The remotesignals are fully described in section 1 on page 17.In the basic configuration, the rear panel MARC and Computer Port connectors are not used. The frontpanel Reference connector is used to check the transmitter's internal reference frequency duringscheduled maintenance. The front panel Microphone/Diagnostics connector has two purposes: amicrophone/headset is connected for local operation, or, a PC is connected for maintenance purposes.Maintenance using a PC connected to the Headset/Diagnostics connector is outside the scope of thisuser guide. Full information is contained in the T6T maintenance handbook.T6T AM-Voice Operation Section 2Page 5Fig. 2-1. T6T Transmitter - Basic ConfigurationAudioRemote PTTExternal VSWRTx InhibitBIT TestAntenna ChangeoverPTT Status SignalUnregulated SupplyReady SignalTape OutputT6T TransmitterFacilitiesConnector AntennaConnectorMicrophone/DiagnosticsConnectorReferenceConnectorRemote SignalsMicrophone/Headsetfor Local OperationPC for maintenancepurposesFrequency Counter formaintenance purposes
CONFIGURATION FOR OPERATION WITH MARCWhen the T6T transmitter is used with a MARC system or other compatible control and data system, theremote signals are connected through the rear panel MARC connector (see Fig. 2-2). In thisconfiguration, the rear panel Facilities and Computer Port connectors are not used unless some auxiliarysignals available at the Facilities connector are required.Section 2 T6T AM-Voice OperationPage 6Fig. 2-2. T6T Transmitter - Configuration for Use with MARCMicrophone/Headsetfor Engineering UsePC for maintenancepurposesFrequency Counter formaintenance purposesAudioRemote PTTControl InformationStatus InformationUnregulated SupplyMARCRSE 2RSE 2has 8equipmentconnectorsallowing upto 8 radiosto beconnectedEquipmentConnectorT6T TransmitterAntennaConnectorMicrophone/DiagnosticsConnectorReferenceConnectorMARCConnector
Chapter 2. AM-Voice SpecificationThis chapter gives the transmitter's specification applicable to AM-voice operation.RF CHARACTERISTICSChannel spacing 25 kHz, or 8.33 kHz across the frequency band 118 to136.975 MHz.Spurious outputs Spurious outputs are below -46 dBm. Spurious outputsare measured greater than 500 kHz from the carrierfrequency and with a modulation index below m = 0.9.Transmitter rise time 90% of full power is reached within 20 ms of keying thetransmitter.Transmitter decay time The output power decays by at least 20 dB 5 ms afterthe keying potential is removed.MODULATION CHARACTERISTICSModulation depth Adjustable up to 100%.Hum and noise Greater than 45 dB below the signal level. Measuredwithin a 15 kHz bandwidth with the carrier modulated bya 1 kHz signal and at a modulation depth of 90%.Frequency response With 25 kHz channel spacing the variation in frequencyresponse, with reference to a 1 kHz signal, is within+1 dB and -3 dB across the frequency range 300 Hz to3.4 kHz. The response is better than -20 dB at 100 Hz,and less than -30 dB at 5 kHz.With 8.33 kHz channel spacing the variation infrequency response, with reference to a 1 kHz signal, iswithin +2 dB and -4 dB across the frequency range350 Hz to 2.5 kHz. Frequencies above 3.2 kHz areattenuated by at least 25 dB.Distortion With a 90% modulation depth, distortion is less than 5%at frequencies between 300 Hz and 3.4 kHz.Residual FM With a 1 kHz signal set at 80% modulation applied to thetransmitter's audio input, the unwanted frequencymodulation is less than 500 Hz.VOGAD The VOGAD has an operational range of 30 dB with thethreshold set relative to the line level setting. Within theVOGAD range, the modulation depth is maintainedwithin 10% of the set level.VOGAD has an attack time between 20 and 50 msmeasured with a 10 dB step to 15 dB into VOGAD, anda decay time greater than 2 seconds.T6T AM-Voice Operation Section 2Page 7
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Chapter 3. AM-Voice InstallationThis chapter details the installation procedures that are applicable only to AM-voice operation.WARNING. LETHAL VOLTAGES!The instructions given in this chapter involve connecting lethal voltages to thetransmitter. The instructions detailed in this chapter must be carried out only by suitablyqualified personnel.WARNING. ANTENNA RADIATION!The antenna used with the transmitter must be installed such that the resultant radiatedfield strength is below 10W/m² in areas normally accessible to personnel.WARNING. BERYLLIUM/BERYLLIA!The equipment covered by this handbook contains components containing the highlytoxic material Beryllium and/or its oxide Beryllia. These materials are particularlyhazardous if:1. Beryllium materials are absorbed into body tissues through the skin, mouth,or wound.2. The dust created by breakage of Beryllia is inhaled.3. Toxic fumes are inhaled from Beryllia/Beryllium involved in a fire.The components containing Beryllia/Beryllium are: TR5, TR6 and TR9 in thePA module.WARNING. UNAUTHORIZED MODIFICATIONS!Changes or modifications made to this equipment that are not expressly approved byPark Air Electronics, or parties authorized by Park Air Electronics, could void the user’sauthority to operate the equipment.CAUTION. ESSDs!The T6T transmitter's circuitry contains Electrostatic Sensitive Devices (ESSDs).Personnel must be aware of the precautions necessary to prevent damage to suchdevices. During installation all precautions necessary to prevent ESSD damage must betaken.INTRODUCTIONThe procedures in this chapter that allow a T6T transmitter to be installed for AM-voice operation are:qSelecting the applicable keying methodqConnecting remote facilities.T6T AM-Voice Operation Section 2Page 9
SELECTING THE APPLICABLE KEYING METHODThe transmitter can be remotely keyed through the Facilities connector CN5 using either the RemotePTT input, or by using Phantom Keying on the audio lines. The chosen method, and the required keyingpotential is selected by the position of two jumpers (JP8 and JP9) fitted on the transmitter's DSP module.To access the jumpers, remove the M3 captive screws that secure the transmitter's top cover (if notalready removed). Remove the cover and identify the links by referring to Fig. 2-3. Set the links to therequired positions as detailed under the next two headings: "Remote Keying" and "Phantom Keying".When the jumpers have been configured, refit the transmitter's top cover.Section 2 T6T AM-Voice OperationPage 10Fig. 2-3 Location of Jumpers JP8 and JP9T6T Transmitter with top coverremoved showing position ofDSP module and jumpers JP8and JP9Front PanelDSP ModulePhantom KeyingRemote Keying28V0VJP8 JP9Factory default setting. The transmitter is set for remote 0 volt keying unless specifiedotherwise at the time of ordering.
REMOTE KEYING CONFIGURATIONSDuring installation jumpers JP8 and JP9 must be set to suit the remote keying potential. The keyingpotentials are 0 volt, a dc voltage between +10 and +50 V, or a dc voltage between -10 and -50 V.The following illustrations show the PTT signal, the settings of jumpers JP8 and JP9, and the ‘PTT inpolarity’ that must be set at the front panel when completing the ‘Operational Settings’ procedures.T6T AM-Voice Operation Section 2Page 11Phantom KeyingRemote Keying28V0VJP8 JP9T6T Transmitter[Front panel PTT Polarity = POS]PTT Switch0 voltRemote PTT0 Volt Keying[Factory default setting]+10 to +50 Volt Keying with Positive Going Active SignalPhantom KeyingRemote Keying28V0VJP8 JP9T6T Transmitter[Front panel PTT Polarity = POS]+10 to +50 V0VPTTPhantom KeyingRemote Keying28V0VJP8 JP9T6T Transmitter[Front panel PTT Polarity = NEG]PTT+10 to +50 V0V+10 to +50 Volt Keying with Negative Going Active Signal
PHANTOM KEYING CONFIGURATIONSPhantom keying can be used with the transmitter. This involves superimposing a dc potential on theaudio lines at the control equipment. The potential can be 0 volt, or between 10 and 50 volts as shown inthe illustrations on the opposite page.To use phantom keying, the PTT switch at the control equipment must connect to a centre-tap on the600 ohm audio transformer. The keying potential is connected to the centre-tap.At the transmitter, jumpers JP8 and JP9, fitted to the DSP module, must be correctly set for phantomkeying.Note that the audio lines in the illustrations connect to the transmitter's Facilities connector CN5. Ifphantom keying is required when using a MARC, or compatible control and data system, the linesconnect to the MARC connector CN6 pins 2 and 3.Section 2 T6T AM-Voice OperationPage 12Phantom KeyingRemote Keying28V0VJP8 JP9T6T Transmitter[Front panel PTT Polarity = POS]0V-10 to -50 VPTTPhantom KeyingRemote Keying28V0VJP8 JP9T6T Transmitter[Front panel PTT Polarity = NEG]PTT0V-10 to -50 V-10 to -50 Volt Keying with Negative Going Active Signal-10 to -50 Volt Keying with Positive Going Active Signal
T6T AM-Voice Operation Section 2Page 13Fig. 2-4. Phantom Keying ArrangementsPhantom KeyingRemote Keying28V0VJP8 JP9Phantom KeyingRemote Keying28V0VJP8 JP9[Front panel PTT Polarity = POS][Front panel PTT Polarity = POS]
CONNECTING THE REMOTE FACILITIESIf the transmitter is being used in the ‘Basic Configuration’ (see Fig. 2-1 on page 5) remote signals areterminated on the rear panel Facilities connector CN5. For configurations where the T6T transmitter isbeing used with a MARC system, or other compatible data and control system, this procedure should beignored; instead, refer to ‘Connecting to MARC Equipment’.The remote facilities available at CN5 are listed in section 1 on page 17. Essential connections, unlessthe transmitter is being used only in local mode, are the audio input (pins 2 and 3) and a keying input. Thekeying input can be the Remote PTT connection on pin 7, or Phantom Keying can be used on the audiolines. The chosen method must correspond to the settings of internal jumpers JP8 and JP9 (seepage 10).Make any other connections to CN5 as required.When making connections to the Facilities connector CN5, and in order not to compromise thetransmitter's Electromagnetic Compatibility (EMC) users must:qUse a D-type connector that has a screened coverqUse screened multi-way cable, with the cable's screen connected to the Facilities connector'sshell or body.Failure to comply with this instruction could result in non-compliance withthe European Commission EMC Directive 89/336/EECCONNECTING TO MARC EQUIPMENTIf the transmitter is being used with a MARC system, or compatible control and data system, remoteconnections are made through the rear panel MARC connector CN6.The pin-out of CN6 is shown in section 1 on page 18. If connecting to a MARC RSE 2 equipment, theconnections between CN6 and one of RSE 2's Equipment Connectors is pin-to-pin as shown in table 2-1.When making connections to the Facilities connector CN6, and in order not to compromise thetransmitter's Electromagnetic Compatibility (EMC) users must:qUse a D-type connector that has a screened coverqUse screened multi-way cable, with the cable's screen connected to the Facilities connector'sshell or body.Failure to comply with this instruction could result in non-compliance withthe European Commission EMC Directive 89/336/EECSection 2 T6T AM-Voice OperationPage 14
Table 2-1 MARC Connector CN6 to RSE 2 Equipment ConnectorT6T Transmitter RSE 2 Equipment ConnectorPinNumber Signal Name PinNumber Signal Name1 Ground 1 0 Volt2 Line In (+) 2 Audio Line L13 Line In (-) 3 Audio Line L24 PTT 4 PTT5 Unregulated Supply 5 Unregulated Supply Input6 Data In (+) 6 Data Out (+)7 Data In (-) 7 Data Out (-)8 Data Out (+) 8 Data In (+)9 Data Out (-) 9 Data In (-)T6T AM-Voice Operation Section 2Page 15
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Chapter 4. AM-Voice Operational SettingsThis chapter details how the T6T transmitter is set up for AM voice operation from the front panel.It also details how to set the transmitter in and out of standby mode.The transmitter can also be set up through a MARC system, or by using the VFP. Both ofthese methods are outside the scope of this handbook; users should refer to the MARCUser Guide and the T6T Maintenance Handbook.INTRODUCTIONSelecting most of the transmitter's operational settings is carried out using the front panel Scroll/Selectswitch and the LCD (see the illustration below). Table 2-2 on page 19 shows a list of the operationalsettings. No attempt to set up the transmitter should be made until the transmitter has been installed asper the Installation Procedures given in section 1 of this user guide.Normal OperationDuring normal operation, the LCD displays the Main screen. This screen shows the operating frequency,the channel number (if the channel store facility is used), the carrier offset (if used), and displays agraphical representation of output power when the transmitter is keyed. If the transmitter has been set toStandby mode, which is shown by the front panel STANDBY indicator being lit, the LCD is blanked.Using the Scroll/Select SwitchThe SCROLL/SELECT switch (referred to throughout this chapter as the ‘Switch’) is used to leave theMain screen and display the Options menu. Further use of the Switch displays various selection menusand allows the required parameters to be set. The switch has three actions: it can be turned clockwise,anti-clockwise, or momentarily pushed in.T6T AM-Voice Operation Section 2Page 17Freq 123.000MHzChan 1Offset +5.0kHzPwr lllllllllll
SCREEN PROTOCOLThe following protocol is applicable to all screens described in this chapter.Main Screen During normal transmitter operation, the Main screen, an example of which isshown below, is displayed.Freq 123 . 000MHzChan 1Offset +5.0kHzPwr IIIIIIIIIIIISwitch Refers to the front panel Scroll/Select switch. The switch is turned clockwise toscroll through fields from left to right, and from top to bottom. The switch isturned anti-clockwise to scroll through fields from right to left, and from bottomto top. The switch is pressed to make a selection.Timeout If during any setting up procedure the Scroll/Select switch is not operated for30 seconds, the display returns to the Main screen. If editing any parameterhas not been completed, the transmitter stays on the original setting.>> Indicates more fields are available other than those currently displayed. Toaccess those fields, turn the switch clockwise through the last displayed field.<< Indicates more fields are available other than those currently displayed. Toaccess those fields, turn the switch anti-clockwise through the first displayedfield.Back When Back is selected, you are returned to the previous menu.Exit When Exit is selected, you are returned to the Main screen.Section 2 T6T AM-Voice OperationPage 18
Table 2-2 Operational SettingsParameter Adjustment Range Factory DefaultSetting Further ReferenceMenu Lock screen Locked or Unlocked Unlocked Page 20To enter Standby mode On or Off Off Page 23To exit Standby mode - - Page 24Set mode of operation AM voice AM-voicePart of AM VoiceSettings Procedurestarting on page 25.PTT test facility On or Off OffPTT timeout 2 s to 510 s, or off 180 sModulation depth 0 to 100% 85%Tx mute On or off OnVogad On or Off OnCarrier offset 0, ±2.5, ±4, ±5, ±7.3,±7.5, or ±8 kHz 0 (no offset)Adjust sidetone volume 0 to 100% 30%Front panel frequency step size 8.33, 25 kHz, or both 25 kHzLCD backlight timeout 15 s to 120 s, Off, or On 30 sPart of GeneralTransmitter Settingsstarting on page 29.PTT inhibit On or Off OffLine input level -40 dBm to 0 dBm -13 dBmOutput power 5 watt to 50 watt 50 WMARC port baud rate 300 to 9600 baud 9600PTT input signal polarity Positive or negative PosPTT output signal polarity Positive or negative PosInhibit input signal polarity Positive or negative PosBIT initiate input signal polarity Positive or negative PosReady output signal polarity Positive or negative PosOperating frequency 118 to 136.975 MHz 118.000 MHz Page 34Store frequency channels 1 to 100 118.000 MHz Page 35Recall frequency channels 1 to 100 - Page 36Initiate a BIT test - - Page 37View BIT pages and advise screen - - Page 38Elapsed time indication - Page 39Display internal referencefrequency screen - - Page 40Software versions - Page 41T6T AM-Voice Operation Section 2Page 19
MENU LOCK SCREENA security facility available only from the VFP allows the transmitter's front panel to be ‘locked’. When thisfacility 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 ECUR I TY MESSAG ESystemLockedOKTo exit the system lock screen:qTurn the switch to highlight OK, then press the switch. You are returned to the main screen.or,qWait for the 30 second timeout to expire. You are returned to the main screen.Section 2 T6T AM-Voice OperationPage 20
NOTES FOR SETTING UP THE TRANSMITTERThe following notes should be read before setting up the transmitter. They advise on the specialfrequency display when using 8.33 kHz channel spacing, and give guidance on the optimum line levelsetting.Front Panel Display for 25 kHz and 8.33 kHz Channel SpacingWhen setting the operating frequency of the transmitter and 8.33 kHz channel spacing is selected, thedisplayed frequency differs from the actual channel frequency. Table 2-3 shows the pattern used for25 kHz and 8.33 kHz spaced channel frequencies from 118.000 MHz to 118.1916 MHz. The pattern isthe same for any frequency within the transmitter's frequency range. The display conforms to ICAOconvention for 8.33 kHz operation.Table 2-3 25 kHz and 8.33 kHz Channel Spacing DisplaysActual Frequency(to 4 decimal places)ChannelSpacingDisplayed Frequencyat Transmitter's Front Panel118.0000 MHz118.0000 MHz118.0083 MHz118.0166 MHz118.0250 MHz118.0250 MHz118.0333 MHz118.0416 MHz118.0500 MHz118.0500 MHz118.0583 MHz118.0666 MHz118.0750 MHz118.0750 MHz118.0833 MHz118.0916 MHz118.1000 MHz118.1000 MHz118.1083 MHz118.1166 MHz118.1250 MHz118.1250 MHz118.1333 MHz118.1416 MHz118.1500 MHz118.1500 MHz118.1583 MHz118.1666 MHz118.1750 MHz118.1750 MHz118.1833 MHz118.1916 MHz25 kHz8.33 kHz8.33 kHz8.33 kHz25 kHz8.33 kHz8.33 kHz8.33 kHz25 kHz8.33 kHz8.33 kHz8.33 kHz25 kHz8.33 kHz8.33 kHz8.33 kHz25 kHz8.33 kHz8.33 kHz8.33 kHz25 kHz8.33 kHz8.33 kHz8.33 kHz25 kHz8.33 kHz8.33 kHz8.33 kHz25 kHz8.33 kHz8.33 kHz8.33 kHz118.000 MHz118.005 MHz118.010 MHz118.015 MHz118.025 MHz118.030 MHz118.035 MHz118.040 MHz118.050 MHz118.055 MHz118.060 MHz118.065 MHz118.075 MHz118.080 MHz118.085 MHz118.090 MHz118.100 MHz118.105 MHz118.110 MHz118.115 MHz118.125 MHz118.130 MHz118.135 MHz118.140 MHz118.150 MHz118.155 MHz118.160 MHz118.165 MHz118.175 MHz118.180 MHz118.185 MHz118.190 MHzT6T AM-Voice Operation Section 2Page 21
Line LevelThe line level, setting displayed on the front panel is equivalent to the average speech level with apeak-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 linelevel setting.The VOGAD and mute thresholds are preset at 10 dB and 15 dB respectively below the line level setting.Table 2-4 Relationship between Line Level, Vogad, and Mute ThresholdLine LevelSetting(dBm)Average SpeechLevel(dBm)Sine Wave Level(dBm)VogadThreshold Mute Threshold0 0 +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 -45-35 -35 -25 -45 -50-40 -40 -30 -50 -55Section 2 T6T AM-Voice OperationPage 22
TO ENTER STANDBY MODEStandby mode is a power saving feature that can be used for non-operational transmitters. When instandby mode, most of the transmitter's circuits are inactive, the LCD is blanked, and the transmittercannot be keyed. To put the transmitter into standby mode, use the following procedure.1. From the Main screen, press the switch todisplay the Options menu. Ensure thatConfigure is highlighted. Press the switch.2. Ensure the Configure menu is displayed.Turn the switch until Standby is highlighted,then press the switch.3. Check that the Standby menu is displayed.Turn the switch until Yes is highlighted, thenpress the switch. [To abandon thisprocedure, select No instead of Yes andthen press the switch.]4. Check that the LCD blanks, and the front panel STANDBY indicator lights.5. The transmitter is now in standby mode. To exit standby, see the next procedure.T6T AM-Voice Operation Section 2Page 23FrequencyChanne lCon f i gu r eBIT Exi tSe t t i ngsS/W VersionsSt andbyBack Ex i tPut radio intoSt andby mode ?YES NO
TO EXIT STANDBY MODEStandby mode is indicated by the front panel STANDBY indicator being lit and the LCD being blanked.To exit this mode, use the following procedure.1. Press the switch and check that the Exitmenu is displayed.2. Turn the switch until YES is highlighted, then press the switch. [To abandon this procedure,select No instead of Yes and then press the switch.]3. Check that the transmitter's Main screen isdisplayed and that the front panelSTANDBY indicator is unlit.4. The transmitter is now ready for normal use.Section 2 T6T AM-Voice OperationPage 24Ex i t S t andbyMod eYES NOFreq 123 . 000 MHzPw r
AM VOICE SETTINGS PROCEDUREDuring this procedure, the following parameters, applicable to AM voice operation, will be set:qMode of operation qPTT test facilityqPTT timeout qModulation depthqMute enable or disable qVogad enable or disableqSelecting a carrier offset qAdjusting the sidetone volumeqSelecting the channel spacing.1. From the Main screen, press the switch todisplay the Options menu. Turn the switchuntil Configure is highlighted. Press theswitch.2. Ensure the Configure menu is displayed.Turn the switch until Settings is highlighted,then press the switch.3. Check that the Function menu is displayed.Ensure Mode is highlighted. Press theswitch.4. Setting the Mode of Operation.Check that AM Voice is displayed. If any other mode is displayed, press the switch until AM Voiceis shown.Turn the switch clockwise until Settings ishighlighted. Then press the switch to displaythe mode specific Settings menu.T6T AM-Voice Operation Section 2Page 25FrequencyChanne lCon f i gu r eBIT Exi tOptions MenuMod eReference FreqDisplay>>Function MenuMod e : AM Vo i c eSe t t i ngsCance l OKSe t t i ngsS/W VersionsSt andbyBack Ex i tConfigure Menu
5. Setting the PTT Test Facility.[Factory default setting: Off]The PTT test facility can be set to Off or On.When Off is selected, the transmitter is keyed only when the PTT signal is active.When On is selected, the transmitter keys, and remains keyed until the display times out.To set the PTT facility, ensure PTT ishighlighted. Press the switch to togglebetween Off and On. When the requiredsetting is displayed, turn the switch clockwiseto highlight PTT Timeout.6. Setting the PTT Timeout.[Factory default setting: 180 s]The PTT timeout can be set to a value between 2 and 510 seconds (in two second steps), or it canbe set to Off. This setting affects the transmitter when keyed by a front panel microphone, orthrough the remote lines.To set the timeout ensure that PTT Timeout ishighlighted and press the switch. Turn theswitch clockwise to increment the time inseconds, or anti-clockwise to decrement thetime in seconds. Note that the fullyanti-clockwise position switches the PTTtimeout to Off. When the required time, or Off,is displayed press the switch. Turn the switchclockwise to highlight Mod Depth.7. Setting the Modulation Depth.[Factory default setting: 85%]The transmitter's modulation depth can be setbetween 0 and 100% in increments of 1%.To set the required value, ensure that ModDepth is highlighted and press the switch.Turn the switch clockwise or anti-clockwise toincrement or decrement the value. When therequired value is displayed, press the switch.Turn the switch clockwise until the next screenis displayed and Mute is highlighted.Section 2 T6T AM-Voice OperationPage 26PTT OFFPTT T imeout 30sMod Depth 90%>>Mode Specific Settings MenuPTT OFFPTT T imeout 30sMod Depth 90%>>PTT OFFPTT T imeout 30sMod Depth 90%>>
8. Setting Mute On or Off.[Factory default setting: On]The transmitter's mute facility can be enabled or disabled.To enable or disable the mute, ensure thatMute Disable is highlighted. Press the switchto toggle between On and Off. On = MuteDisabled; Off = Mute enabled. When therequired setting is highlighted, turn the switchclockwise to highlight Vogad.9. Switching Vogad On or Off.[Factory default setting: On]The transmitter's Vogad facility can be set to On or Off.To enable or disable the Vogad, ensure thatVogad is highlighted. Press the switch totoggle between On and Off. When the requiredsetting is highlighted, turn the switch clockwiseto highlight Offset.10. Setting the Carrier Offset.[Factory default setting: 0]A carrier offset can be used with the transmitter. The available offsets are ±2.5 kHz, ±4.0 kHz,±5 kHz, ±7.3 kHz, ±7.5 kHz, and ±8 kHz.Note that transmitter type B6350OPT1 must be used if selecting an 8 kHz carrier offset, and aseparate setting up procedure must be completed. This procedure, which involves the use ofexternal test equipment, is detailed in the T6T transmitter maintenance handbook.To select the required offset (0.0 kHz must beselected if no offset is used) ensure that Offsetis highlighted and press the switch. Turn theswitch to display the required value, then pressthe switch. Turn the switch clockwise, through>> to highlight Headset.T6T AM-Voice Operation Section 2Page 27Mu t e OFFVogad OFFOffset 0.0kHz<< >>Mu t e OFFVogad OFFOffset 0.0kHz<< >>Mu t e OFFVogad OFFOffset 0.0kHz<< >>
11. Adjusting the Sidetone Volume.[Factory default setting: 30%]The transmitter's sidetone volume through theheadset is adjusted from this screen. To dothis, ensure Headset is highlighted and pressthe switch.Check that the Volume setting is highlighted.Turn the switch clockwise to increase volume,or anti-clockwise to decrease volume. Thevolume increments or decrements in 5%steps. When the required setting is displayed,press the switch. Highlight OK, and press theswitch to teurn to the mode specific settingsmenu.Turn the switch clockwise, through >> to highlight Channel Spacing.12. Setting the Front Panel Frequency Step Size.[Factory default setting: 25 kHz]The transmitter's channel spacing can be 25 kHz, or 8.33 kHz. The radio automatically sets thecorrect channel spacing for the frequency that is entered at the front panel. This setting, which isonly for the user's convenience, alters front panel frequency step size.qIf all channels to be selected or stored are 25 kHz spaced channels, then 25 should beselected.qIf all channels to be selected or stored are 8.33 kHz spaced channels, then 8.3 should beselected.qIf a mixture of the two are required, both 25 and 8.3 should be selected.To select the required spacing, ensure thatChannel Spacing is highlighted and press theswitch.Check that the Channel Spacing menu isdisplayed and that Spacing is highlighted.Press the switch to change between 25 kHz,8.3 kHz, and both. When the required value isdisplayed, turn the switch to highlight OK, thenpress the switch again. You will be returned tothe Mode Specific Settings menu.13. To exit the AM Voice Settings Procedure, turn the switch to highlight OK, then press the switch.You are returned to the Main screen. When this procedure is complete, go to the GeneralTransmitter Settings procedure starting on the next page.Section 2 T6T AM-Voice OperationPage 28Spac ing 25kHzCance l OKHeadse tChanne l Spac i ngBackEx i tHeadse tChanne l Spac i ngBackEx i tVolume 030%OK
GENERAL TRANSMITTER SETTINGSDuring this procedure the following parameters are set:qSetting the LCD backlight qSetting inhibit to on or offqSetting the input line level qSetting the output powerqSetting the MARC baud rate qSetting the PTT input signal polarityqSetting the PTT output signal polarity qSetting the inhibit input signal polarityqSetting the BIT initiate signal polarity qSetting the Ready output signal polarityqSetting the antenna change-over signalpolarity1. From the Main screen, press the switch todisplay the Options menu. Turn the switchuntil Configure is highlighted. Press theswitch.2. Ensure the Configure menu is displayed.Turn the switch until Settings is highlighted,then press the switch to display the Functionmenu.3. Ensure the Function menu is displayed. Turnthe switch until Display is highlighted.T6T AM-Voice Operation Section 2Page 29FrequencyChanne lCon f i gu r eBIT Exi tOptions MenuSe t t i ngsS/W VersionsSt andbyBack Ex i tConfigure MenuMod eReference FreqDisplay>>Function Menu
4. Setting the LCD Backlight.[Factory default setting: 30 s]The LCD's backlight can be set to off,permanently on, or timed to stay on for aperiod between 15 and 120 seconds(adjustable in 15 second steps) after theScroll/Select switch was last operated.Check that the Function menu is displayedand ensure Display is highlighted. Press theswitch.Ensure the Backlight menu is displayed andthe Backlight setting is highlighted. Rotationof the switch displays the full range ofsettings. When the required setting ishighlighted, press the switch. Turn the switchuntil OK is highlighted, then press the switch.You are returned to the Function menu.5. Setting Inhibit.[Factory default setting: Off]Inhibit can be set to either On or Off. When set to on, the transmitter cannot be keyed; when set tooff the transmitter operates normally. Note that a separate Inhibit function is available on theFacilities connector CN5 (see pin-out in section 1 on page 17).From the Function menu, turn the switchclockwise until Inhibit is highlighted, thenpress the switch.Check that the Inhibit menu is displayed andInhibit is highlighted. Pressing the switchtoggles between On and Off. When the correctsetting is displayed turn the switch clockwiseto highlight OK, then press the switch. You arereturned to the Function menu.Section 2 T6T AM-Voice OperationPage 30Mod eReference FreqDisplay>>Back l i gh t OFFCance l OKInhibi tLine LevelPowe r<< >>Inhibi t ONCance l OK
6. Setting the Line Level.[Factory default setting: -13 dBm]The audio line level can be set to any value between -40 dBm and 0 dBm. Some notes regardingthe optimum line level are given on page 22.From the Function menu, turn the switchclockwise until Line Level is highlighted, thenpress the switch.Check that the Line Level menu is displayedand that Line Lvl is highlighted, then press theswitch.Turn the switch clockwise or anti-clockwise toincrease or decrease the value. When therequired value is displayed, press the switch.Turn the switch to highlight OK and then pressthe switch. You are returned to the Functionmenu.7. Setting the Output Power.[Factory default setting: 50 W]The transmitter's output power can be set to any value between 5 watts and 50 watts (in one wattsteps).From the Function menu, turn the switchclockwise until Power is highlighted, thenpress the switch.Ensure that the Power menu is displayed andthat Power is highlighted.Press the switch. Turn the switch clockwise toincrease the power, or anti-clockwise todecrease the power. When the required valueis displayed, press the switch. Turn the switchclockwise until OK is highlighted, then pressthe switch. You are returned to the Functionmenu.T6T AM-Voice Operation Section 2Page 31Inhibi tLine LevelPowe r<< >>Line Lvl -13dBmCance l OKInhibi tLine LevelPowe r<< >>Powe r 50WCance l OK
8. Setting the MARC Baud Rate.[Factory default setting: 9600]The baud rate must be set when the T6T transmitter is connected to a MARC system (or othercompatible data and control system). The rate can be set to 300, 600, 1200, 2400, 4800, or 9600baud. The standard setting for MARC systems is 9600 baud.From the Function menu, turn the switchclockwise until MARC is highlighted, thenpress the switch.Ensure that the MARC menu is displayed andthat the Baud Rate is highlighted. Press theswitch.Turn the switch until the required value isdisplayed, then press the switch. Turn theswitch clockwise until OK is highlighted, thenpress the switch. You are returned to theFunction menu.9. Polarity Settings.The polarity of the following input and output and output signals is set using the Polarity menu:qPTT input signalqPTT output signalqInhibit input signalqBIT initiate input signalqReady output signal.In addition to the signals listed, the polarity ofthe Antenna Change-Over signal isdetermined from this menu. It is always thesame polarity as the PTT output signal.To establish the required polarity for the PTTinput signal, refer to the illustrations starting onpage 11 under the heading ‘Remote Keying Configurations’. Note that internal links must also becorrectly configured to obtain the required input PTT configuration.To establish the required polarity for the other input and output signals, refer to table 2-5.To set the required polarity, turn the switch to highlight the required parameter, then press theswitch to toggle between NEG and POS.Section 2 T6T AM-Voice OperationPage 32MARCPo l a r i t yBackEx i t <<Baud Rate 9600Cance l OKPTT I n NEGPTT Ou t POSInhibi t NEG>>BIT Ini t NEGReady Out POSBackEx i t <<Polarity Menu
Table 2-5 Signal PolaritiesSignal Description State when Polarity isset to NEGState when Polarity isset to POSPTT outputThis output, when active,indicates the transmitter iskeyed. It is a groundingoutput.Output is a highimpedance when thetransmitter is keyed, and0 volt when not keyed.Output is 0 volt when thetransmitter is keyed, and ahigh impedance when notkeyed.TransmitterinhibitThis input signal, whenactive, prevents the radiofrom being keyed. This isa TTL input pulled-up to5V.A 5 volt input inhibits thetransmitter.A 0 volt input inhibits thetransmitter.BIT initiateAn input signal thatinitiates a BIT interruptivetest. This is a TTL inputpulled-up to 5 V. The inputsignal must be active for aminimum of 300 ms; thesignal cannot then beactivated again for at least3 seconds.A 5 volt input initiates aBIT test.A 0 volt input initiates aBIT test.Ready outputThis output is active whenthe radio is ready totransmit and no faultshave been detected by theBIT circuitry. It is an opencollector output.Output is a highimpedance when thetransmitter is ‘ready’, and0 volt when not ‘ready’.Output is 0 volt when thetransmitter is ‘ready’, anda high impedance whennot ‘ready’.Antennachange-overAn output signal that can be used to control an antenna change-over relay when thetransmitter is used in conjunction with a T6R receiver. Antenna change-over is agrounding output.This signal cannot be independently set. It is always the same polarity as the PTToutput signal.10. To exit the General Transmitter Settings Procedure, turn the switch to highlight Exit, then pressthe switch. You are returned to the Main screen. When this procedure is complete, go to Settingthe Operating procedure starting on the next page.T6T AM-Voice Operation Section 2Page 33
SETTING THE OPERATING FREQUENCYTo set the transmitter's operating frequency, use the following procedure. If a frequency is to be storedas one of the 100 available preset channels, ignore this procedure and go to ‘Allocating ChannelNumbers to Specified Frequencies’ on page 35. Before setting the operating frequency, the requiredchannel spacing should be set (see page 28).1. From the Main screen, press the switch todisplay the Options menu. Ensure thatFrequency is highlighted. Press the switch.2. Ensure the Set Frequency menu isdisplayed and that the MHz digits arehighlighted. Press the switch.3. Turn the switch clockwise to increase frequency, or anti-clockwise to decrease frequency. TheMHz value increments/decrements in 1 MHz steps. Stop when the required value is shown. Pressthe switch.4. Turn the switch clockwise to highlight the kHz digits and press the switch. Turn the switchclockwise to increase frequency, or anti-clockwise to decrease frequency (note that continuousscrolling of the kHz value will increment or decrement the MHz value). Stop when the requiredvalue is shown. Press the switch. Note that if 25 kHz channel spacing is selected, the kHz valueincrements/decrements in 25 kHz steps; if 8.33 kHz channel spacing is selected, the kHz valueincrements/decrements in the pattern detailed in ‘table 2-3, Front Panel Display for 25 kHz and8.33 kHz Channel Spacings’ on page 21. If both is selected, the display shows the 25 kHz and8.33 kHz channels.5. Turn the switch clockwise until either Cancel or OK is highlighted. Then press the switch. If cancelis selected, the new frequency entered in this procedure is ignored. If OK is selected, thetransmitter operates on the new frequency.Section 2 T6T AM-Voice OperationPage 34FrequencyChanne lCon f i gu r eBIT Exi t121 . 500MHzCance l OK
ALLOCATING CHANNEL NUMBERS TO SPECIFIED FREQUENCIESUp to 100 frequency channels can be stored in the transmitter. Use the following procedure to allocatefrequency channels.1. From the Main screen, press the switch todisplay the Options menu. Turn the switchuntil Channel is highlighted. Press theswitch.2. Ensure the Channel menu is displayed. Turnthe switch until Set is highlighted. Press theswitch.3. Ensure the Channel screen is displayed andturn the switch until the channel number ishighlighted. Press the switch, then turn theswitch until the required channel number isdisplayed. When it is, press the switch.4. Turn the switch to highlight the MHz value, then press the switch. Turn the switch until therequired value is displayed, then press the switch. Repeat for the kHz value.5. When the correct frequency for thedisplayed channel number is displayed, turnthe switch until Store is highlighted, thenpress the switch.6. Repeat steps 3 to 5 for all frequency channels that are to be stored. When the required number offrequency channels have been stored, highlight Store and End and press the switch. You will bereturned to the Main screen.T6T AM-Voice Operation Section 2Page 35Ch001 119 . 100MHzReca l lStoreStore and EndCh001 119 . 100MHzReca l lStoreStore and EndCh007 123 . 450MHzReca l lSe tBackFrequencyChanne lCon f i gu r eBIT Exi tThe process of allocating frequency channels can be simplified by using the VFP.The VFP software is contained in the T6T transmitter's maintenance kit.
TO RECALL CHANNEL FREQUENCIESFrequency channels that have been stored in the transmitter can be recalled by channel number asfollows.1. From the Main screen, press the switch todisplay the Options menu. Turn the switchuntil Channel is highlighted. Press theswitch.2. Ensure the Channel menu is displayed. Turnthe switch until the channel number ishighlighted. Press the switch. Turn theswitch until the required channel number isdisplayed. Then press the switch.3. Turn the switch until Recall is highlighted,then press the switch.4. The Main screen will then be displayedshowing the transmitter's selected channelnumber and corresponding operatingfrequency.Section 2 T6T AM-Voice OperationPage 36FrequencyChanne lCon f i gu r eBIT Exi tCh007 123 . 450MHzReca l lSe tBackCh007 123 . 450MHzReca l lSe tBackFreq 123 . 450MHzChan 7Pw r
TO INITIATE AN INTERRUPTIVE BIT TESTUse the following procedure to initiate an interruptive BIT test from the transmitter's front panel. A BITtest cannot be initiated while the transmitter is keyed.1. From the Main screen, press the switch todisplay the Options menu. Turn the switchuntil BIT is highlighted. Press the switch.2. Ensure the BIT menu is displayed. Turn theswitch until BIT Initiate is highlighted, thenpress the switch.3. During the test, which takes approximatelytwo seconds, the Testing screen isdisplayed.4. When the test has finished, check that the transmitter's front panel Alarm indicator is not lit. After aBIT test, BIT screens are automatically displayed. The screens are shown on the next page.T6T AM-Voice Operation Section 2Page 37FrequencyChanne lCon f i gu r eBIT Exi tBIT Ini t iateBIT ViewBack Ex i tTest ingPl ease Wa i tDuring an interruptive BIT test, the transmitter radiates a modulated carrier wave. Usersshould therefore obtain the necessary authority before initiating a test.Users should ensure a load is connected to the transmitter's antenna connector,and note that the BIT circuits apply a signal to the audio input lines during a test.
TO VIEW BIT PAGES AND ADVISE SCREENUse the following procedure to view the BIT page displays. Note that after a BIT interruptive test, the BITscreens are automatically displayed.1. From the Main screen, press the switch todisplay the Options menu. Turn the switchuntil BIT is highlighted. Press the switch.2. Ensure the BIT menu is displayed. Turn theswitch until BIT View is highlighted, thenpress the switch.3. A series of pages is shown displayingcertain transmitter parameters. Someexamples are shown here.A full list of BIT screens along withappropriate explanations is given in theT6T transmitter maintenance handbook.4. Note that the last BIT screen allows Adviseto be highlighted and selected by pressingthe switch. If any BIT faults have beendetected, the advise screen recommendsthe remedial action, in order of priority, to betaken.Further detail regarding the Advise screenis given in the T6T transmitter maintenancehandbook.Section 2 T6T AM-Voice OperationPage 38FrequencyChanne lCon f i gu r eBIT Exi tBIT Ini t iateBIT ViewBack Ex i tAC Supp l y ONDC Supp l y OFFSupp l y 31V>>Example BIT ScreenSyn t h Lock PASSPA T emp 3 0 °PA Temp PASS<< >>Example BIT ScreenAdviseBack<<Last BIT ScreenPl ease Check1:Antenna2:PA Ctrl .Example Remedial Advise Screen
ELAPSED TIME INDICATORAn elapsed time indicator (ETI) shows the number of hours the transmitter has been powered up sincemanufacture. To view the ETI:1. From the Main screen, press the switch todisplay the Options menu. Turn the switchuntil BIT is highlighted. Press the switch.2. ETI can be seen measured in hours andminutes.T6T AM-Voice Operation Section 2Page 39FrequencyChanne lCon f i gu r eBIT Exi tBIT Ini t iateBIT ViewETI 00123:59Back Ex i t
DISPLAYING THE TRANSMITTER'S INTERNAL REFERENCE FREQUENCY SCREENTo display the transmitter's internal reference frequency screen, use the following procedure.1. From the Main screen, press the switch todisplay the Options menu. Turn the switchuntil Configure is highlighted. Press theswitch.2. Ensure the Configure menu is displayed.Turn the switch until Settings is highlighted,then press the switch.3. Check that the Function menu is displayedand turn the switch until Reference Freq ishighlighted. Press the switch.4. Ensure the Reference menu is displayed.5. To exit the screen, wait for 30 seconds whenthe display automatically reverts to the Mainscreen, or select Cancel.Section 2 T6T AM-Voice OperationPage 40FrequencyChanne lCon f i gu r eBIT Exi tSe t t i ngsS/W VersionsSt andbyBack Ex i tMod eReference FreqDisplay>>Ref Freq 50.0%Cance l OKCaution!This procedure is included only for informational purposes. The reference frequency settingmust not be altered unless following the procedure given in the T6T maintenance handbook.External test equipment is required to set this parameter.Failure to comply with this caution may render the transmitter inoperable.
SOFTWARE VERSIONS SCREENThe software versions screen allows the user to view the version of various software modules installed inthe transmitter. To view the software versions, use the following procedure.1. From the Main screen, press the switch todisplay the Options menu. Ensure thatConfigure is highlighted. Press the switch.2. Ensure the Configure menu is displayed.Turn the switch until S/W Versions ishighlighted, then press the switch.3. Check the Software Versions screen isdisplayed. Select Boot, Flash, or Fills andpress the switch to display the installedversion. The example shows the Bootsoftware.4. Select OK, then press the switch to return tothe Software Versions screen. View theother software modules as required.T6T AM-Voice Operation Section 2Page 41FrequencyChanne lCon f i gu r eBIT Exi tOptions MenuSe t t i ngsS/W VersionsSt andbyBack Ex i tConfigure MenuBoo tFlashFillsBack Ex i tSoftware Versions ScreenBoot VersionS0271V0001OKBoot Version Screen

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