Back to Main Page T6T 50 Watt VHF Multimode Transmitter This documentation is applicable to transmitters at Mod strike 7 Select Topic Specification Operation Installation Maintenance Approvals and Standards
Back to Transmitter Main Page Approvals and Standards T6T VHF 50 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.
Back to Transmitter Main Page Specification This section gives the specification applicable to the T6T VHF 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.
Back to Transmitter Main Page General Specification The general specification applies to a transmitter irrespective of the selected operating mode. Separate listings are given for AM modes, Mode 2 and Mode 3. Variants The T6T VHF Multimode Transmitter is available in the variants as listed in Table 1. Table 1 Transmitter Variants Description Part Number Frequency Range Special Applications 50 watt standard frequency coverage transmitter B6350/NB/50 118 to 136.
Back to Transmitter Main Page Table 2 Power Consumption Requirement Normal Operation ac dc Maximum 500 VA 12 A Not Transmitting 60 VA 1A Dimensions and Weight The dimensions and weight of the transmitter are: Width 483 mm (19 inches). Height 88.9 mm (3.5 inches). The height occupies 2U of equipment cabinet space. Depth 430 mm (16.9 inches) measured from front panel to rear panel. 450 mm (17.8 inches) measured from front panel to rear of fan. Weight 13.5 kg (29.76 pounds).
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 1 W steps from 5 W to 50 W (as an option, the maximum selectable power can be limited).
Back to Transmitter Main Page Spurious Outputs All variants Intermodulation All variants 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.
Back to Transmitter Main Page Residual FM All variants 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’s specification applicable to Mode 2 operation.
Back to Transmitter Main Page Mode 3 This section gives the transmitter’s specification applicable to Mode 3 operation.
Back to Transmitter Main Page Operation This document describes the controls, indicators, setting up and operating instructions applicable to the T6T VHF Multimode Transmitter.
Back to Transmitter Main Page Controls, Indicators and Front Panel Connectors This part details the purpose of all controls and indicators of the T6T transmitters. Front Panel The front panel’s controls, indicators and connectors are shown below and detailed in the following paragraphs. 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 13.
Back to Transmitter Main Page Table 2 Microphone/Diagnostics Connector - PC Connections Pin Number Signal Input or Output Description 2 Transmit data Output RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no handshaking. 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's 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 selecting various parameters using the Virtual Front Panel (VFP), through a Multi-Access Remote Control (MARC) system, from a T6 controller, or from the transmitter’s front panel. The transmitter can be configured for remote or local use. Table 9 on page 30 details the functions and parameters that can be set from all these sources.
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 I I Main Screen (Example) Displayed during normal transmitter operation I I Control Screen 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's 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 Table 4 Relationship Between Line Level, VOGAD Threshold and Mute Threshold Line Level Setting (dBm) Average Speech Level (dBm) Sine Wave Level (dBm) VOGAD Threshold (dBm) Mute Threshold (dBm) +10 +10 +20 0 -5 +5 +5 +15 -5 -10 0 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 Changing the Transmitter’s Operating Frequency The transmitter’s frequency
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's 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 24). 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 a t F A I 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 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 Enter standby mode All Yes or No - Exit standby mode All Yes or No - page 13 Set mode of operation All AM-voice, AM-MSK, Mode 2 or Mode 3 AM-voice page 14 Set polarities AM-voice, AM-MSK STD or INV STD page 20 Band edges All 118.000 to 136.975 MHz or 112.000 to 155.
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, ±5, ±7.3, ±7.5, (or ±4, ±8 HS only) 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 B a c k E x i t T6T VHF 50 W Transmitter Enabled or Disabled.
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 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 hard-wire 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, 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 changeover) 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 state is: PTT Ref can be set to +14 V, 0 V or -14 V. PTT state is: +14 V Ref.
Back to Transmitter Main Page Mode 2 and Mode 3 Polarity Settings R e a d y O u t S T D E - B I T I S T D E x t V S W R E x i n I n S T D t > > Each of the three polarity settings applicable to Mode 2 and Mode 3 can be set to the default STD (standard) setting or INV (inverted). The signal connections are shown 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 e 0 0 0 0 0 : 0 0 h r i D C l i y y O N y h 2 8 V L o c k E x i 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 i n g i l Pass, Fail or Not Tested. > > Pass, Fail or Not Tested. P A S S p u t 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 A C S u p p l y O N D C S u p p l y O N E x i t y h L o c k T e m p E x i t P A C o o l E r Synth lock (Pass or Fail). 5 0 d e g C < < L o o p Shows value of dc supply. P A S S i n g V S W R i Shows state of dc supply (On or Off). 2 8 V P A E x Shows state of ac 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 5 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 i 65-xxxxxxxx represents the software part number and /v v represents its version. e 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 ] Band Edges The frequency range of the transmitter is 118 to 136.975 MHz for the B6350/NB version, or 112 to 155.
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 changeover output polarity (AM modes only) ✔ ✔ View state ✗ ✗ ✗ STD Set external VSWR inpu
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 BIT Initiate BIT interruptive test STANDBY Enter and exit standby facility SOFTWARE CONFIGURATION View the transmitter’s software config
Back to Transmitter Main Page Installation
Back to Transmitter Main Page Warnings and Cautions WARNING Dangerous Voltages The instructions given in this section involve connecting dangerous voltages to the transmitter. The instructions detailed in this document must 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.
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 Unregulated supply RS422 Data MARC Connector or, MARC Data and MARC Audio Connectors 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 changeover output Ready output Tape output Facilities Connector Reference Connector Microphone/Diagnostics Connector Frequency Counter required only for maintenance Mic/He
Back to Transmitter Main Page RSE2 T6T Transmitter Audio Equipment Connector PTT Unregulated supply 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 changeover output Ready output Tape output Facilities Connector Reference Connector Microphone/Diagnostics Connector Mic/Headset for engineering use Frequency Counter required only for
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 50 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 Guide CD (part number 31-36T62VCD) is normally supplied with the transmitter. This CD includes the VFP software.
Back to Transmitter Main Page Front Panel 88.9 29.0 41.7 47.0 152.8 207.5 232.2 378.2 390.9 399 430 450 All measurements in mm 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 IEC Terminating the ac input supply. DC Supply 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 (input) 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 Changeover 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
Back to Transmitter Main Page Introduction This section gives the scheduled and unscheduled maintenance procedures for the T6T 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 frequency standard. VHF Frequency Counter 3 Perform a BIT interruptive test.
Back to Transmitter Main Page (8) If not 5-carrier offset, refer to AM Voice Mode Settings Screen in the Operation section of this document and set to the required offset. (9) If 5-carrier offset is required, restore the carrier offset using the following routine: ❑ Connect a 50 ohm frequency counter, through a 60 dB attenuator, to the transmitter’s rear panel Antenna connector (see Fig 1 for location of the Antenna connector).
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 document 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. (1) When removing or refitting modules, observe antistatic handling precautions. (2) 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 Cover To remove the top cover, locate and unscrew the 18 countersunk screws securing the top cover to the mainframe.
Back to Transmitter Main Page JP2 Shown set for transmitter TS7 T2 T3 IC38 C84 T R/TR IC19 IC20 IC21 IC25 T R/TR IC27 (1) Ensure the module’s interface connectors CN5 and CN6 are located correctly and are aligned with the screw holes in the rear panel. Fit the four screwloc 8 mm-4-40 UNC screws and wavy washers but leave them loose.
Back to Transmitter Main Page (13) Remove the VFP connector and switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter from the ac and/or dc supplies. (14) Refit the transmitter’s top cover (take note of repairs caution (1) on page 7 before carrying out this task). The transmitter can now be returned to service. Removing and Refitting the PSU Regulator Module The PSU Regulator module is located as shown in Fig 3. A module removal diagram is shown in Fig 5.
Back to Transmitter Main Page (3) Secure the module to the transmitter’s mainframe using the three M3 x 8 mm captive washer screws removed during the removal procedure. (4) Re-establish the ac and/or dc supplies (take heed of the warning on page 7). (5) Switch power on at the radio using the rear mounted Power switch. (6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
Back to Transmitter Main Page Refitting To refit the PA Control module, proceed as follows: (1) Place the module in position. Ensure no wires are trapped by the module. (2) Fit the seven M3 x 8 captive washer screws that secure the module to the transmitter’s mainframe.
Back to Transmitter Main Page (7) Slide back the terminal block cover and disconnect the ac wires from the three connector terminal block (marked L N E). (8) Carefully remove the power supply from the transmitter. Refitting (1) With the transmitter on its side hold the power supply near to its securing position in the top half of the radio.
Back to Transmitter Main Page Refitting To refit the PA module, proceed as follows: (1) Place the module in position and butt it up to the mainframe. Ensure no wires are trapped by the module. (2) Fit the six M3 x 8 countersunk screws and two M3 x 8 mm captive screws that secure the module to the transmitter’s mainframe. (3) Fit the black equipment handle to the PA side of the radio using the two M5 x 16 mm panhead screws. (4) Connect the SMB connectors CN8 and CN10.
Back to Transmitter Main Page (7) Remove the Front Panel PCB from the Front Panel assembly by removing the six M3 x 6 mm panhead screws and wavy washers (see Fig 9 Diagram B). Refitting To refit the Front Panel assembly PCB, proceed as follows: (1) Place the PCB in position at the Front Panel assembly. Ensure the spindle of the control knob and microphone/diagnostics connector are correctly located.
Back to Transmitter Main Page (3) Connect the 2-pin fan connector to the fan. Ensure the + marked socket mates with the + marked plug on the fan. (4) Re-establish the ac and/or dc supplies. (5) Switch power on at the radio using the rear mounted Power switch. (6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit. The transmitter can now be returned to service.
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 Any invalid parameters are not indicated until the Settings are downloaded to the radio. It is the radio that rejects invalid parameters, not the VFP. The transmitter’s reference frequency setting is displayed in the window. Adjusting the reference frequency is a maintenance operation that requires external test equipment to be connected.
Back to Transmitter Main Page 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 component layout diagram on page 24).
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 Location of PA Control Module RV8 Figs 1 to 10 follow T6T 50 W VHF Transmitter Page 24 Maintenance
Back to Transmitter Main Page Front View ANTENNA DANGER HIGH RF VOLTAGES CONNECT ANTENNA BEFORE USE T1/E1 HDLC MARC DATA MARC AUDIO AC SUPPLY MARC FACILITIES SUPPLY RATINGS AC SUPPLY 48 - 62Hz ~ 110 - 240V ( +10%) 4A POWER 400VA max DC SUPPLY FUSE F2 FUSE F2 110-240V T4A 250V IEC 110V - 120V T4A 125V UL FUSE F1 FUSE F1 21.
Back to Transmitter Main Page * CN7A ** Connections Processor Name Characteristic Connections Front Panel CN4-1 CN1-1 LED Alarm Open collector (5mA) CN4-2 CN1-2 LED Ready Open collector (5mA) Front Panel Microphone/ Diagnostics CN2-1 1 Processor Ground - Microphone +20 dBm to -20 dBm 600R 0 V or +10 V to +60 V or -10 V to -60 V at 6mA 4 TRING Unregulated Supply Fused 500mA, 21.
Back to Transmitter Main Page Antenna Connector Processor Module Fan VHF TX PA Control Module Regulation Module VHF TX RF PA Module Power Supply View on underside - Bottom Cover removed Top view - Top Cover removed T6 Series 2 VHF Transmitter Module Location Diagram Front Panel Module Fig 3 Module Location Diagram Tx Module Location
Back to Transmitter Main Page PA GA10931 C N8 Fig 4 Processor Module - Removal and Refitting Detail
Back to Transmitter Main Page CN6 Brown (L) Blue (N) CN7 CN8 CN2 CN1 CN3 Fig 5 PSU Regulator Module - Removal and Refitting Detail GA10929
Back to Transmitter Main Page CN3 CN4 CN5 This connector will twist on itself CN5 CN4 3 PC Fig 6 PA Control Module - Removal and Refitting Detail
Back to Transmitter Main Page Power Supply Fig 7 Power Supply - Removal and GA10928 Refitting Detail
Back to Transmitter Main Page GA10930 Fig 8 PA Module - Removal and Refitting Detail
Back to Transmitter Main Page CN5 PA Control Allen head grub screw Front panel PCB Front Panel Diagram A GA10944, GA10927 Diagram B Fig 9 Front Panel Assembly PCB - Removal and Refitting Detail
Back to Transmitter Main Page AIRFLOW Finger guard power connections here Fig 10 Cooling Fan - Removal and GA10945 Refitting Detail
