T6T VHF 100 W Transmitter User Documentation
Errata Any errors found in this handbook are promulgated 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 VHF 100 W Transmitter User Documentation Handbook Part Number: 31-3T6T100V Handbook Version: 2.
Health and Safety Warnings A warning is used to indicate possible danger to personnel. Throughout Park Air handbooks, warnings are indicated by the following symbols: WARNING Indicates electrical danger to personnel. WARNING Indicates a hazardous material. WARNING Indicates a non-ionizing radiation hazard. WARNING Indicates a specified danger to personnel. Cautions A caution is used to indicate possible danger to the equipment.
List of Abbreviations ac alternating current RF radio frequency AGC automatic gain control ROM read-only memory AM amplitude modulation RSE2 remote site equipment ATC air traffic control RSSI receiver signal strength indication BER bit error rate V volt BIT built-in test VFP virtual front panel C celsius VHF very high frequency CD compact disk VOGAD voice-operated gain adjusting device dB decibel VSWR voltage standing wave ratio dc direct current W watt DSB double si
Approvals and Standards T6T VHF 100 Watt Transmitters Approvals: The equipment is designed to meet the essential requirements of Directives 1999/5/EC, 89/336EEC as amended by Directive 93/68/EEC, and 72/23/EEC. Standards: The following standards are applied: EMC EN 301 489-1; EN 301 489-22. Health & Safety, EN 60950, CAN/CSA-C22.2 No. 60950, UL 60950. Radio EN 300 676, IC RSS141, FCC part 15 and 87. Telecom CS-03.
About This Hard Copy This document, apart from the preface, is a hard copy of the files contained on the CD and comprises the following parts: Preface (not on CD) Introduction Specification Operation Installation Maintenance.
Back to Transmitter Main Page Introduction This topic gives a brief introduction to the T6T VHF 100 W Multimode Transmitter.
Back to Transmitter Main Page Purpose The T6T VHF multimode 100 W 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).
Back to Transmitter Main Page Frequency Selection T6 radios operate with 8.33 kHz and 25 kHz channel spacing. The radios recognize frequencies entered in ICAO format and automatically adjust to the correct channel spacing. For multichannel operation up to 100 preset frequency channels can be stored in the radio for immediate recall; any combination of 8.33 kHz and 25 kHz channel spacing can be stored.
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Back to Transmitter Main Page Specification This section gives the specification applicable to the T6T VHF 100 W Multimode Transmitter operating in AM modes, Mode 2 and Mode 3. All radios operate in AM-Voice mode. Additional software must be loaded to allow AM-MSK, Mode 2 and Mode 3 operation.
Back to Transmitter Main Page General Specification The general specification applies to the T6T 100 watt transmitter irrespective of the selected operating mode. Separate listings are given for AM modes, Mode 2 and Mode 3. One model of the T6T VHF 100 W Multimode Transmitter is available as detailed in Table 1. Table 1 100 Watt T6 Transmitter Description Part Number 100 watt, high stability, standard frequency coverage transmitter B63100HS/NB Frequency Range Special Applications 118 to 136.
Back to Transmitter Main Page Dimensions and Weight The dimensions and weight of the 100 watt transmitter are: Width 483 mm (19 inches). Height 177.8 mm (7 inches). The height occupies 4U 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 25 kg (55 pounds). Environmental Temperature range The transmitter operates to specification across the temperature range of -20°C to +55°C.
Back to Transmitter Main Page AM Modes The transmitter can operate in AM-Voice mode (standard) and AM-MSK mode (optional). The following specifications apply to both modes unless stated otherwise. Transmitter RF Characteristics RF Power Output The RF carrier output power is adjustable in 2 W steps from 10 W to 100 W. As an option, the maximum selectable power can be limited.
Back to Transmitter Main Page Spurious Outputs Both modes Intermodulation Both modes The spurious outputs are less than -46 dBm for modulation depths up to 90%, measured at greater than 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 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.
Back to Transmitter Main Page Residual FM Both modes VOGAD AM-Voice AM-MSK Mute AM-Voice AM-MSK Differential Group Delay AM-MSK For a test signal of 1 kHz set at 80% modulation depth applied to the line input of the transmitter, the unwanted peak frequency modulation does not exceed ±500 Hz. The VOGAD has an operational range of 30 dB. The VOGAD can be disabled. The VOGAD is disabled. The mute level is set at 15 dB below the average speech line level setting. The mute can be disabled.
Back to Transmitter Main Page Mode 2 This section gives the transmitter specification applicable to Mode 2 operation. Mode 2 parameters are identical to AM-Voice mode parameters 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 representing 000.
Back to Transmitter Main Page Mode 3 This section gives the transmitter specification applicable to Mode 3 operation. Mode 3 parameters are identical to AM-Voice mode parameters 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 representing 000.
Back to Transmitter Main Page Operation This topic describes the transmitter’s operating controls and indicators. It also details how to set up the transmitter’s operating parameters.
Back to Transmitter Main Page Controls, Indicators and Front Panel Connectors This section describes the transmitter’s controls, indicators and front panel connectors. Front Panel The transmitter’s front panel is illustrated below. LCD Scroll/Select Switch READY ALARM TRANSMIT REFERENCE F r e q 1 1 8 .0 0 0 M H z Ch 100 +7.
Back to Transmitter Main Page Standby Indicator A red indicator that lights when the transmitter is in standby mode. When in standby mode, most 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 14.
Back to Transmitter Main Page Table 2 Microphone/Diagnostics Connector - PC Connections Pin Number Input or Output Signal Description 4 Receive data Input RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no handshaking. 7 Ground - 0 V. Rear Panel Power Switch The rear panel power switch is a 2-way rocker switch used to select between power on, and standby.
Back to Transmitter Main Page Setting Up and Operation Introduction 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, from an associated T6 controller. VFP operation is described on this disk under Maintenance; MARC and T6 controller functionality is described in separate handbooks.
Back to Transmitter Main Page 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 . C h 1 0 0 M o d e A M P w r I I I 0 0 0 M H z + 7 . 3 k H z V o i c e I I I I I I I Switch Refers to the front panel Scroll/Select switch.
Back to Transmitter Main Page F r e q 1 1 8 . 0 0 0 M H z C h 1 0 0 M o d e A M P w r I I I V o i c e I I I Control Screen I I Main Screen (Example) Displayed during normal transmitter operation I I Menu Lock Screen Configure the transmitter operating parameters, access the BIT facility or view the software configuration.
Back to Transmitter Main Page Menu Lock Screen A security facility available only from the VFP allows the transmitter 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.
Back to Transmitter Main Page 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.
Back to Transmitter Main Page Line Level Setting The input line level setting displayed on the front panel is equivalent to the average speech 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 setting.
Back to Transmitter Main Page Changing the Transmitter Operating Frequency The transmitter 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 highlight the digit to be changed, then press the switch. (3) Turn the switch until the required digit is shown, then press the switch.
Back to Transmitter Main Page To Store and Recall Frequency Channels Up to 100 frequency channels can be stored in the transmitter. To store a Channel Frequency: (1) (2) (3) (4) 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. Highlight the MHz frequency value (see Example 2) press the switch and then turn it until the required MHz value is shown.
Back to Transmitter Main Page To Initiate a BIT Test Use the following procedure to initiate an interruptive BIT test from the transmitter 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 BIT Screen on page 25). An interruptive BIT test cannot be initiated in Mode 2 or Mode 3. During an interruptive BIT test, the transmitter radiates modulated carrier waves at the set power.
Back to Transmitter Main Page (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 (5) Selecting OK takes the user back to the BIT screen. T e s t S t F A I a t u s L O K (6) 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.
Back to Transmitter Main Page Settings Operational settings for the T6T 100 W VHF transmitter are configured at the front panel, through the VFP, and through an associated MARC system (or compatible control system). Some settings can also be made remotely via a T6 controller. The Settings screen is entered from the Control screen.
Back to Transmitter Main Page Table 5 Operational Settings from the Front Panel Parameter Mode Adjustment Range Factory Default Setting Further Reference Menu lock screen All Locked or unlocked Unlocked page 8 Enter standby mode All Yes or No - page 14 Exit standby mode All Yes or No - page 14 Set mode of operation All AM-Voice, AM-MSK, Mode 2 or Mode 3 AM-Voice page 15 Set polarities AM-Voice, AM-MSK STD or INV STD page 21 Band edges All 118.000 to 136.975 MHz 118.
Back to Transmitter Main Page 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 ❑ PTT on (key) or off (de-key) ❑ Transmitter time out ❑ Modulation depth ❑ Mute (on or off) ❑ VOGAD (on or off) ❑ Antenna c/o delay (on or off) ❑ Offset ❑ Step ❑ Mic ❑ Key priority (local or remote) ❑ Enable or disable local PTT ❑ Enable or disable remote PTT ❑ Enable or di
Back to Transmitter Main Page Adjustments O f f S t e p M i c E x i s e t 0 k H z 2 5 k H z P A S S I t K e y < < P r L o c a l R e m o t E x i 0 . i o r t y P T T e P T T t R e m i < < P h a n P T T V E 0, ±2.5, ±4, ±5, ±7.3, ±7.5, ±8 kHz. 25 kHz, 8.33 kHz or both. Active or Passive. > > L - R Local-remote or Remote-local. E N Enabled or Disabled. E N Enabled or Disabled. > > E N Return to Settings screen.
Back to Transmitter Main Page 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 ❑ PTT on (key) or off (de-key) ❑ Transmitter time out ❑ Modulation depth ❑ Antenna c/o delay (on or off) ❑ Key priority (local or remote) ❑ Enable or disable local PTT ❑ Enable or disable remote PTT ❑ Enable or disable remote phantom PTT.
Back to Transmitter Main Page Mode 2 Settings Screen This is an advisory screen. Pressing OK returns the user to the Main screen. M o d e 2 a r e p a r a m e t e r s e t v i a t i e r f a c e H L D C n t s h e O K Mode 3 Settings Screen This is an advisory screen. Pressing OK returns the user to the Main screen.
Back to Transmitter Main Page Polarities Screens AM-Voice and AM-MSK A number of remote indication and control signals can be hardwire connected to the transmitter. These signals include a transmitter ready indication, a PTT control signal, a phantom PTT control signal, a PTT out indication, a transmitter inhibit control signal, an E-BIT input, a BIT test initiation control signal, an external VSWR fault indication and antenna C/O.
Back to Transmitter Main Page Table 6 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. An open collector high impedance 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 external fault. TTL input. 5 V indicates an external fault.
Back to Transmitter Main Page Table 6 AM-Voice and AM-MSK Polarity Settings (Continued) Signal Connector Polarity set to STD Polarity set to INV Fast PTT Output (antenna change-over) MARC Audio, pin 3 Open collector NPN transistor grounding output, 200 mA max, n/o. Open collector NPN transistor grounding output, 200 mA max, n/c. PTT Ref - PTT Ref can be set to +14 V, 0 V or -14 V. PTT. Maximum input level ±60 V with respect to PTT reference.
Back to Transmitter Main Page Mode 2 and Mode 3 Polarity Settings R e a d y O u t S T D Each of the three polarity settings applicable to E - B I T I S T D Mode 2 and Mode 3 can be set to the default STD E x t V S W R E x i n I n S T D t > > (standard) setting or INV (inverted). The signal connections are detailed in Table 7 along with the conditions when STD or INV is selected.
Back to Transmitter Main Page 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 E T I A C E x n i t D C a t 0 0 0 0 0 : S u p p l i i y y O N h 2 8 V L o c k t P A T e m p P A C o o l E x i t R F D r P A O u t P A L o o p E x i t Shows elapsed time 0:00 to 99999:59 (Hrs:Min). Shows state of ac supply (On or Off). i n g l P A S S Pass, Fail or Not Tested. > > P A S S Pass, Fail or Not Tested.
Back to Transmitter Main Page D S P 2 P A S S Pass or Fail. X i l i n x 1 P A S S Pass or Fail. X i l i n x 2 P A S S Pass or Fail. E x i t < < E E P R O M S t a r C a l i E x i t t U p b r a t B I P w r T M A R C E x i o n P A S S Pass or Fail. P A S S Pass or Fail. P A S S Pass or Fail. < < U n k e y e d E - i t > > > > P A S S Pass or Fail. P A S S Pass or Fail. A C T I V E < < > > Active or Inactive. H D L C I N A C T I V E Active or Inactive.
Back to Transmitter Main Page 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 Shows elapsed time 0:00 to 99999:59 (Hrs:Min). A C S u p p l y O N Shows state of ac supply (On or Off). D C S u p p l y O N Shows state of dc supply (On or Off).
Back to Transmitter Main Page Software Configuration Screens Software configuration screens are as follows: T 6 V H F 1 1 8 H i g h E x i 1 0 0 W 1 3 6 .
Back to Transmitter Main Page F i l 6 5 [ 3 l 6 5 - S o f t w a r x x x x x x x x / D e s c r F i [ l l i 4 p t i S o f i p t T6T VHF 100 W Transmitter i 65-xxxxxxxx represents the software part number and /v v represents its version. v v o n ] t w a r x x x x x x x x / D e s c r e v v o n ] e 65-xxxxxxxx represents the software part number and /v v represents its version.
Back to Transmitter Main Page Band Edges The frequency range of the T6 100 W transmitter is 118 to 136.975 MHz. If required, transmission can be limited to either one or two smaller parts of the 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 B E 4 E x i > > 1 3 6 .
Back to Transmitter Main Page 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.
Back to Transmitter Main Page Table 9 Functions and Parameters Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting 118.
Back to Transmitter Main Page Table 9 Functions and Parameters (Continued) Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting Set microphone type (active or passive) (AM-Voice only) Passive Set keying priority (local or remote) Local-Remote Enable or disable local PTT Enabled Enable or disable remote PTT Enabled Enable or disable remote phantom PTT Enabled Radio Settings (Digital
Back to Transmitter Main Page Table 9 Functions and Parameters (Continued) Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting Set PTT reference voltage (AM modes only) View state +14 V Set PTT output polarity (AM modes only) View state STD Set fast PTT antenna changeover output polarity (AM modes only) View state STD Set antenna change-over output polarity (AM modes only) View state STD Set external VSWR inp
Back to Transmitter Main Page Table 9 Functions and Parameters (Continued) Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting - Not in Standby - Front panel lock Off MARC lock Off T1/E1 lock Off HDLC lock Off Initiate BIT interruptive test STANDBY Enter and exit standby facility SOFTWARE CONFIGURATION View the transmitter’s software configurat
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Back to Transmitter Main Page Installation This topic gives the information required to install a T6T VHF 100 W Multimode Transmitter.
Back to Transmitter Main Page Warnings and Cautions WARNING Dangerous Voltages The instructions given in this topic involve connecting dangerous voltages to the transmitter and should be carried out only by suitably qualified personnel. WARNING Dangerous Voltages The equipment is permanently connected to the mains supply when the mains connector is attached. Switching the rear panel Power switch to off does not isolate all internal circuits from the mains supply.
Back to Transmitter Main Page Introduction The procedures necessary to install a transmitter are listed in Table 1. Table 1 Installation Procedures Procedure Reference 1 Read and understand the warnings and cautions given on page 2. 2 Perform an initial inspection of the transmitter and fit the correct ac input fuse. page 9 3 Fit the transmitter into an equipment cabinet. page 9 4 Make external signal connections.
Back to Transmitter Main Page Configuration Connection of external equipment depends on the configuration required. Possible configurations are: ❑ T6T transmitter configured for local operation (see Fig 1). ❑ T6T transmitter configured for remote operation (see Fig 2). ❑ T6T transmitter configured for use with MARC (see Fig 3). ❑ T6T Mode 2 configuration (see Fig 4). ❑ T6T Mode 3 configuration. (see Fig 5).
Back to Transmitter Main Page T6T Transmitter Audio PTT MARC Connector or, MARC Audio Connector Antenna Connector Optional Facilities that can be used if required E-BIT input PTT relay output External VSWR input dc supply output Inhibit input BIT interruptive test input Antenna change-over output Ready output Tape output Facilities Connector Reference Connector Microphone/Diagnostics Connector Frequency Counter required only for maintenance Mic/Headset for engineering use Laptop (or PC) required on
Back to Transmitter Main Page RSE2 T6T Transmitter Audio Equipment Connector PTT dc supply output MARC Connector RS422 data Antenna Connector Optional Facilities that can be used if required E-BIT input PTT relay output External VSWR input Unregulated supply output Inhibit input BIT interruptive test input Antenna change-over output Ready output Tape output Facilities Connector Reference Connector Microphone/Diagnostics Connector Mic/Headset for engineering use Frequency Counter required only for m
Back to Transmitter Main Page T6T Transmitter Reference Connector Antenna Connector Microphone/Diagnostics Connector HDLC Connector Mode 2 Network Computer Control and data T6R Receiver T1/E1 Connector Control and data.
Back to Transmitter Main Page T6T Transmitter Antenna Connector T1/E1 Connector Mode 3 Network Computer Reference Connector Microphone/Diagnostics Connector Control and data Frequency Counter required only for maintenance Laptop (or PC) required only for maintenance Fig 5 T6T Transmitter Mode 3 Configuration T6T VHF 100 W Transmitter Page 8 Installation
Back to Transmitter Main Page Installation Procedures Initial Inspection of the Transmitter 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. One copy of the T6 User Documentation CD (part number 31-36T62VCD) is normally supplied with the transmitter. This CD includes the VFP software.
Back to Transmitter Main Page 1 2 3 4 Item Description 1 Transmitter 2 Inner Slide 3 M4 Wavy Washer 4 M4 x 8 mm Half Head Bolt Fig 6 Slide Fittings Make External Signal Connections Making the external signal connections involves configuring the transmitter to suit its operational mode. Illustrations showing various configurations are shown in Fig 1 to Fig 5; these figures should be used only as a guide.
Back to Transmitter Main Page Microphone/Diagnostics Connector The Microphone/Diagnostics connector is a self-locking 7-way DIN socket used for connecting a microphone, microphone/headset or PC. The connector pin-out is detailed in Table 3. Pin-out of the Microphone/Diagnostics connector looking into the mating face of the chassis mounted socket. A suitable free socket is detailed in Table 2 on page 3.
Back to Transmitter Main Page Rear Panel Connectors The rear panel connectors are shown in Fig 8 and listed in Table 4. Select which connectors are going to be used and then make connections as required. Table 4 Rear Panel Connector Usage Connector Type Usage AC supply 2 x IEC Terminating the ac input supply. DC supply 2 x XLR 3-pin Terminating the dc input supply. Antenna N-type Terminating the antenna feeder coaxial cable. External speaker 3.
Back to Transmitter Main Page MARC Connector The MARC connector is a 9-way D-type socket used to connect the transmitter to a MARC remote site equipment, or it can also be used for normal remote operation. As an alternative to using this connector, the RJ48 style MARC Audio and MARC Data connectors can be used to provide the same functions. The MARC connector pin-out is shown below and detailed in Table 5. 5 Pin-out of MARC connector looking into the mating face of the chassis mounted socket.
Back to Transmitter Main Page MARC Audio Connector The MARC Audio connector is an 8-way RJ48 socket. It can be used as an alternative to the MARC connector for audio and PTT connections. The connector pin-out is shown below and detailed in Table 6. Numbering is shown looking from the top of the connector. The top is being viewed when the lever is on the bottom. RJ48 Plug Pin 1 Table 6 MARC Audio Connector Pin Number Signal Characteristic 1 Audio line in (-) Balanced 600 ohm, -20 to +20 dBm.
Back to Transmitter Main Page MARC or MARC Audio Connector T6T Transmitter MARC Audio Connector Audio is pins 1 and 2. PTT is pin 6 Ground is pin 7. Control Equipment Cross-Site Lines MARC Connector Audio is pins 2 and 3. PTT is pin 4 Ground is pin 1. Audio line 1 Audio Circuit Audio line 2 Reference Voltage (0 V, +14 V or -14 V) Set from front panel PTT PTT input requires at least 1 mA to operate. Input will draw no more than 6 mA.
Back to Transmitter Main Page MARC Data Connector The MARC Data connector is an 8-way RJ48 socket. It can be used as an alternative to the MARC connector for data connections. The connector pin-out is shown below and detailed in Table 7. Numbering is shown looking from the top of the connector. The top is being viewed when the lever is on the bottom.
Back to Transmitter Main Page T1/E1 Connector The T1/E1 connector is an 8-way RJ48 socket used for connecting to a Mode 3 network computer or connecting a transmitter and receiver together when operating as a Mode 2 base station. The connector pin-out is detailed in Table 8. Numbering is shown looking from the top of the connector. The top is being viewed when the lever is on the bottom. RJ48 Plug Pin 1 Table 8 T1/E1 Connector Pin 1 Signal RRing Characteristic T1 - Balanced 100 ohm (±10%), 1.
Back to Transmitter Main Page HDLC Connector The HDLC connector is an 8-way RJ48 socket used for connecting to a Mode 2 network computer. The connector pin-out is detailed in Table 9. Numbering is shown looking from the top of the connector. The top is being viewed when the lever is on the bottom. RJ48 Plug Pin 1 .
Back to Transmitter Main Page External Speaker The External Speaker connector is a 3.5 mm stereo jack used for connecting an external speaker to the transmitter to provide sidetone. This speaker should be a high impedance active type. Table 10 External Speaker Pin Signal Characteristic Tip Speaker drive (output) 0 to 3 V pk-pk. Connected directly to Ring. Ring Speaker drive (output) 0 to 3 V pk-pk. Connected directly to Tip. Sleeve Ground 0 V.
Back to Transmitter Main Page Facilities Connector The Facilities connector is a 15-way D-type filtered socket used for connecting to associated parts of a system. The connector pin-out is detailed in Table 11. 8 Pin-out of Facilities connector looking into the mating face of the chassis mounted socket. 1 A suitable free socket is detailed in Table 2 on page 3. 15 9 Table 11 Facilities Connector Pin Number Signal Characteristic 1 Ground 0 V.
Back to Transmitter Main Page T6T Transmitter (Main) Antenna Facilities Connector Antenna 28 Vdc (nominal) T6T Transmitter (Standby) Main/Standby Transmit Relay Facilities Connector 9 Control 5 Solid State Relay 6 8 Link Antenna Example This example shows the Antenna Change-over Output configured to control the antenna switching between main and standby transmitters.
Back to Transmitter Main Page Chassis Stud Connection WARNING Chassis Earth A chassis stud is fitted to the transmitter's rear panel. 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.
Back to Transmitter Main Page Connect the AC Input Supply WARNING Dangerous Voltages The equipment is permanently connected to the mains supply when the mains connector is attached. Switching the rear panel Power switch to off does not isolate all internal circuits from the mains supply. For this reason, a mains isolating switch should be fitted close to, and easily accessible from, the transmitter's position.
Back to Transmitter Main Page Switching On WARNING Dangerous Voltages When the Power switch is set to the Standby position, dangerous voltages are still present in the transmitter's internal power supply circuitry. To ensure safe working, the transmitter must be isolated from the ac and dc input supplies. When installation is complete, the transmitter should be switched on at the rear panel 2-way rocker Power switch.
Back to Transmitter Main Page Maintenance This topic gives scheduled maintenance procedures, details module replacement, and describes how to use the Virtual Front Panel (VFP).
Back to Transmitter Main Page Introduction This section gives the scheduled and unscheduled maintenance procedures for the T6T 100 W transmitter and shows how to use the Virtual Front Panel (VFP). Scheduled Maintenance A scheduled maintenance procedure is given on page 3. Park Air recommends that this task be completed every twelve months. Unscheduled Maintenance Normally, the T6 transmitter is considered a Line Replaceable Unit (LRU) and should be replaced with a serviceable spare if a fault occurs.
Back to Transmitter Main Page Scheduled Maintenance Park Air recommends that scheduled maintenance is carried out at twelve-monthly intervals. Scheduled maintenance comprises the following checks: Number Check Tools/Test Equipment Required 1 Ensure the equipment is clean and that external connectors are securely fitted. Camel hair brush/clean lint-free cloths 2 Check and reset (if required) the transmitter’s internal frequency reference. VHF frequency counter 3 Perform a BIT interruptive test.
Back to Transmitter Main Page (8) If not using 5-carrier offset, refer to AM-Voice Mode Settings Screen in the Operation section of this document and set to the required offset.
Back to Transmitter Main Page To Initiate a BIT Test An interruptive BIT test cannot be initiated in Mode 2 or Mode 3. During an interruptive BIT test, the transmitter radiates modulated 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.
Back to Transmitter Main Page AC and DC Change-over Check If both ac and dc input supplies are connected to the transmitter, carry out the following check: (1) Confirm that both ac and dc supplies are connected to the transmitter. Ensure that the rear panel Power switch is set to the I (on) position. (2) Confirm that the front panel Ready indicator is lit, the LCD is illuminated, and the transmitter is operational. (3) Switch off the ac supply from its source.
Back to Transmitter Main Page Unscheduled Maintenance WARNING Dangerous Voltages The instructions given in this section involve connecting dangerous voltages to the transmitter. Maintenance should be carried out only by suitably qualified personnel. When an ac supply is connected, dangerous voltages are present within the transmitter. Care must be taken by personnel to avoid accidental contact with exposed circuitry during maintenance or alignment procedures.
Back to Transmitter Main Page Introduction This document provides the user with detailed instructions on the removal and replacement of modules and assemblies. When removing or refitting modules, observe antistatic handling precautions. Do not change any potentiometer (or link) settings unless detailed in these instructions. Potentiometers have been set using specialist equipment.
Back to Transmitter Main Page Top and Bottom Covers One of the top cover screws is covered with a warranty label that should not be tampered with unless Park Air Customer Support has advised otherwise. When authorisation has been made the following procedures should be followed. To remove the top cover, locate and unscrew the 19 countersunk screws securing the top cover to the mainframe. Access can then be gained to the Processor module and PSU Regulation module.
Back to Transmitter Main Page Refitting To refit the Processor module, proceed as follows: (1) Place the module in position. Ensure no wires are trapped by the module. Ensure jumper J2 on the module is set to ‘T’ for transmitter (see Fig 1).
Back to Transmitter Main Page (11) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure To Calibrate the Transmitter on page 26. (12) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5. (13) Set the transmitter internal reference frequency by carrying out the procedure detailed on page 3. (14) Set the rear panel Power switch to Standby and remove the VFP connector.
Back to Transmitter Main Page Refitting To refit the PSU Regulator module, proceed as follows: (1) While holding the module in position, connect the following connectors: ❑ CN1 4-way connector (part of loom to Combiner BIT module CN7) ❑ CN2 2-way connector (part of loom to Combiner BIT module CN7) ❑ CN7 3-way connector (3-wire loom to rear panel On/Off switch) ❑ CN3 3-way connector (part of loom to Combiner BIT module CN7) ❑ CN4 14-way connector (14-way ribbon cable to Processor module CN3) ❑ C
Back to Transmitter Main Page Removing and Refitting the PA Control Module The PA Control module is located as shown in Fig 5. A module removal diagram is shown in Fig 10. WARNING Dangerous Voltages Dangerous voltages are present within the transmitter. Care must be taken by personnel to avoid accidental contact with exposed circuitry when the covers are removed and power is applied to the radio.
Back to Transmitter Main Page (8) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5. (9) Set the transmitter internal reference frequency by carrying out the procedure detailed on page 3. (10) Set the rear panel Power switch to Standby and remove the VFP connector. Isolate the transmitter from the ac and/or dc supplies. (11) Refit the transmitter bottom cover. The transmitter can now be returned to service.
Back to Transmitter Main Page Refitting To refit the power supply modules: (1) With the transmitter on its side hold each power supply near to its securing position in the top half of the radio. (2) Slide back the terminal block cover and connect the ac wires to the three connector terminal block (marked L N E); brown to terminal L, blue to terminal N and yellow/green to terminal E.
Back to Transmitter Main Page Removing and Refitting the Combiner BIT Module The Combiner BIT module is located as shown in Fig 5. The removal diagram is shown in Fig 12. WARNING Dangerous Voltages Dangerous voltages are present within the transmitter. Care must be taken by personnel to avoid accidental contact with exposed circuitry when the covers are removed and power is applied to the radio.
Back to Transmitter Main Page (5) Remove the six M3 nuts that secure the Combiner BIT module PCB to the stud spacers. Also remove the two M3 x 8 mm panhead screws that secure the Combiner BIT module heatsink to the lower PA heatsink. The Combiner BIT module can now be removed. Refitting (1) Place the Combiner BIT module in place on the stud spacers and replace the six washers and nuts but do not tighten. Take care that cables are dressed properly and that none are trapped.
Back to Transmitter Main Page Removing and Refitting the PA Modules Caution Repairs When carrying out repairs to the PA module, care must be taken not to damage the gasket. If the strips become damaged, they must be replaced. Failure to comply with this instruction may compromise the transmitter Electromagnetic Compatibility (EMC) and breach European Commission regulations. When screws are inserted into the transmitter PA casting care must be taken not to exceed a torque of 6 Ibs/inch when tightening.
Back to Transmitter Main Page (8) Remove the two screws holding the upper heatsink to the rear panel and the countersunk screw securing it to the front of the chassis. Slowly withdraw the upper PA module from the mainframe taking care not to snag the wiring looms. Note that SMB connector CN10 is located within the bottom of the heatsink fins and should be disconnected using long nosed pliers. Do not attempt to remove the connector by pulling on the cable.
Back to Transmitter Main Page Removing and Refitting the Front Panel Assembly PCB The Front Panel assembly PCB is located as shown in Fig 14. Removing this assembly necessitates the removal of both Power Supply modules and partial removal of the Combiner BIT module. WARNING Dangerous Voltages Dangerous voltages are present within the transmitter. Care must be taken by personnel to avoid accidental contact with exposed circuitry when the covers are removed and power is applied to the radio.
Back to Transmitter Main Page (6) Route the coaxial cable SMB connector to CN5 on the PA Control module and connect it. (7) Re-establish the ac and/or dc supplies. (8) Switch power on at the radio using the rear mounted Power switch. (9) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit. (10) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5. (11) Set the rear panel Power switch to Standby.
Back to Transmitter Main Page Virtual Front Panel (VFP) Virtual Front Panel (VFP) software is supplied on CD-ROM and is compatible with any PC or laptop running Windows 2000™ or Windows XP™. The VFP allows changes to a radio’s settings and channel information, it displays the current BIT state, displays BIT history, allows security locks to be set, and provides maintenance facilities. A radio can be set up using the front panel Scroll/Select switch and LCD, or by using the VFP.
Back to Transmitter Main Page Installing the VFP Software The VFP software is supplied by Park Air on CD-ROM. The software can be run from the Main page or installed on your PC via Explorer. To install the software onto your PC: (1) Using explorer, display the contents of the CD-ROM supplied by Park Air. Identify the file named S0473Vxx.EXE (where xx is the version number). (2) Using the mouse, right click on the file and then select Copy. (3) Display the Windows desktop.
Back to Transmitter Main Page Settings Window This window lists all attributes that can be adjusted by the user. If any individual attribute is clicked on using the mouse, help information is displayed in the Status Information window showing the range of adjustment for that attribute. Click on the value and use the keyboard to amend it; press Enter to confirm the new value noting that the amended text is green until it is downloaded into the radio.
Back to Transmitter Main Page Fig 3 Blank VFP Screen (3) At the Menu Bar, click on Serial Port and select either Com 1 or Com 2. The selection must correspond to the port used to connect to the radio. (4) Load the required information from the radio, or from a stored file. The required information can be radio settings, frequency channels, BIT information, or all of these.
Back to Transmitter Main Page (7) Check that after downloading to a radio, no invalid parameters are returned (such parameters are displayed as red text). If there are invalid parameters, amend them and then repeat the download. (8) When there is no further requirement for using the VFP, exit the VFP software and disconnect the radio from the PC. To Initiate a BIT Test During an interruptive BIT test, the transmitter radiates modulated carrier waves at the set power.
Back to Transmitter Main Page (8) With the Confirm screen displayed and dummy load connected, select Yes to continue with the calibrate routine. The Progress screen will then be displayed. (9) When the PA Control/PA loop has been calibrated the Progress screen disappears and the VFP screen reappears showing a calibration complete message in the Status Information window. (10) Gain access to the PA Control module and identify RV8 (see Fig 4).
Back to Transmitter Main Page Location of RV8 Small Screening Can RV8 R135 R125 R131 C421 R382 R130 RV8 D24 R456 R243 R455 TP10 CN4 R231 C424 R348 Fig 4 Location of PA Control Module RV8 T6T VHF 100 W Transmitter Page 28 Maintenance
TOP PSU Regulation Module PA-1 Cooling Fans Processor Module PSU-1 PSU-2 SIDE Back to Transmitter Main Page FRONT PA-2 Fig 5 T6T 100 W Module Location Diagram PA Control Module Combiner BIT Module REAR BOTTOM
CN7-4 CN7-3 CN7-2 CN7-1 T TIP T RING n/c R TIP R RING Name T:G.703(E1) ANSIT1.403-1995(T1),ITU- T:G.703(E1) ANSI T1.403-1995 (T1), ITU- Characteristic A CN7-5 n/c Connections CN7-6 n/c PinNumber CN7-7 HDLC CLA HDLC RxB RS422 RS422 RS422 RS422 RS422 CN7-2 HDLC TxB RS422 Characteristic CN7-3 HDLC TxA 0V Name CN7-4 HDLC CLB 21.
MARC Port 1 Line In- Line In+ Ground +20dBm to -20dBm 600R +20dBm to -20dBm 600R 0V CN1-4 CN1-3 CN1-2 CN1-1 Processor Connections CN1-4 CN1-3 CN1-2 CN1-1 PA Control 5 RF AGC (Not used) Ground IF AGC (Not used) Ground 0 to 2.5V 0V 0 to 2.5V 0V T6 100 WCombiner BIT Connections Unregulated Supply Fused 500mA, 21.6 to 32V CN1-5 CN1-5 Ground 0 to 2.
CN6 CN3 CN1 CN4 Back to Transmitter Main Page CN5 Fig 8 Processor Module - Removal and Refitting Detail
CN2, CN6, CN7 Back to Transmitter Main Page CN5 CN4 CN1 CN3 Fig 9 PSU Regulation Module - Removal and Refitting Detail
CN4 Back to Transmitter Main Page CN3 CN2 CN6 CN5 (behind box) CN1 Fig 10 PA Control Module - Removal and Refitting Detail
Bit Combiner to PSU (fan control) PSU to Bit Combiner (dc Connections) Back to Transmitter Main Page PSU 2 PSU 1 Bit Combiner to PSU (fan control) PSU to Bit Combiner (dc Connections) Fig 11 Power Supply - Removal and Refitting Detail
CN18 CN17 CN16 CN23 CN22 CN27 CN25 CN24 Connector Locations CN15 CN14 CN13 CN26 Back to Transmitter Main Page CN2 CN4 CN1 CN3 CN11 CN10 CN12 CN5 CN6 CN7 Fig 12 Combiner BIT Module - Removal and Refitting Detail
Back to Transmitter Main Page Fig 13 PA Modules - Removal and Refitting Detail PA 1 PA 2
Back to Transmitter Main Page Fig 14 Front Panel and Front Panel Assembly PCB Removal and Refitting Detail
power connections here Finger guard AIRFLOW Back to Transmitter Main Page Fig 15 Cooling Fans - Removal and Refitting Detail
Back to Transmitter Main Page Intentionally Blank
