T6T 300 Watt VHF Transmitter User Documentation
Errata Any errors found in this handbook, or associated equipment handbooks, 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.
Health & Safety, EN 60950, CAN/CSA-C22.2 No. 60950, UL 60950. Radio IC RSS141, FCC part 15 and 87.
Declaration of Conformity We, the undersigned, Company Address, City Country Phone number Fax number Park Air Systems Limited Northfields, Market Deeping, Peterborough PE6 8UE England +44 1778 345434 +44 1778 342877 certify and declare under our sole responsibility that the following equipment: Product description / Intended use EU / EFTA member states intended for use Member states with restrictive use Manufacturer Brand Type Ground to air communications in the VHF aeronautical band All countries None
Health and Safety T6T 300 Watt VHF Transmitter The T6T 300 watt VHF transmitter operates from a low voltage dc input supply, or a standard mains ac input supply. When using a mains supply, dangerous voltages are present on the rear panel ac connector and within the equipment. For this reason, only suitably qualified personnel should install and maintain the equipment. WARNING Antenna Radiation In use, an antenna is connected to the transmitter.
Warnings and Cautions The following warnings and cautions are used in Park Air documentation. Warnings A warning is used to indicate possible danger to personnel. Throughout Park Air user documentation, 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.
Customer Support Contacting Park Air Customer support is available using email, telephone or fax. If you require help in configuring, installing or maintaining equipment supplied by Park Air, use any of the contact methods listed below. Email Address: support@uk.parkairsystems.
Fault Report Customer: .................................................................... Address: .................................................................... .................................................................... .................................................................... Telephone: .................................................................... Email: .................................................................... Fax: ..................................
Abbreviations The following list gives the standard abbreviations used in Park Air user documentation.
VCCS voice control and communication switch VFP virtual front panel VHF very high frequency VOGAD voice-operated gain adjusting device W watt Page 10
Table of Contents Page Approvals and Standards Health and Safety Customer Support Abbreviations 3 5 7 9 Overview Purpose Models and Part Numbers Mechanical Installation Operating Parameters Frequency Selection Virtual Front Panel 15 16 18 18 19 19 19 Specification General Specification Variants Number of Channels Frequency Accuracy Power Requirements Dimensions and Weight Transmitter Combiner Environmental AM Modes Transmitter RF Characteristics Output Impedance RF Power Output Duty Cycle Channel Spacin
Table of Contents (continued) Page Mode 2 27 27 27 27 27 27 27 27 27 27 28 28 28 28 28 28 28 28 28 RF Power Rise Time RF Power Decay Time Channel Spacing Transmitter Modulation Characteristics Modulation Rate RMS Phase Error Phase Acceleration Transmitter Control Time Out Mode 3 RF Power Rise Time RF Power Decay Time Channel Spacing Transmitter Modulation Characteristics Modulation Rate RMS Phase Error Phase Acceleration Transmitter Control Operation Overview T6T VHF Amplifier Rear Panel Supply Switch Dri
Table of Contents (continued) Page AM-MSK Mode Settings Procedure AM-MSK Mode Settings Screen Mode 2 Settings Screen Mode 3 Settings Screen Polarities Screen AM-Voice and AM-MSK AM-Voice and AM-MSK Polarity Settings Mode 2 and Mode 3 Polarity Settings AM-Voice and AM-MSK BIT Screen Mode 2 and Mode 3 BIT Screen Software Configuration Screens Band Edges BIT Status Warning Screens Installation Warnings and Cautions Introduction Fuses and Connectors Installing the Transmitter Initial Inspection of the Transmitt
Table of Contents (continued) Page Maintenance Introduction Configuration Hardware Configuration Software Configuration Replacement Modules Scheduled Maintenance Cleaning and Checking Security of Connectors Setting the Transmitter Internal Reference Frequency Setting a 5-Offset Carrier Frequency To Initiate a BIT Test AC and DC Change-over Check Unscheduled Maintenance Introduction Molex KK Connectors Tools, Materials and Test Equipment Required T6T VHF Amplifier Procedures Top and Bottom Covers Removing an
Overview
Purpose The T6T 300 watt VHF transmitter is intended for use in fixed ground environments such as airports and en-route centres. The transmitter operates in voice and ICAO defined data modes at frequencies between 118 and 136.975 MHz. Dependent on the software loaded into the radio, the following operating modes can be selected: ❑ AM-Voice. All transmitters have this mode ❑ AM-MSK (optional) ❑ Mode 2 (optional) ❑ Mode 3 (optional).
Fig 2 T6T VHF Combiner 100 W Amplifier Drive Assembly 100 W Amplifier Combiner 100 W Amplifier Fig 3 300 Watt Transmitter Arrangement T6T 300 Watt VHF Transmitter Page 17 Overview
Models and Part Numbers Table 1 identifies a T6T 300 watt VHF transmitter. Fig 4 shows the identification labels attached to each component. Each label identifies the model, part number, serial number and modification level. Table 1 Model Identification Description T6T 300 watt standard frequency coverage, high stability, VHF transmitter Part Number Frequency Range B63300HS 118 to 136.975 MHz Channel Spacing (AM-Voice) 25 kHz or 8.
Operating Parameters The transmitter’s operating parameters are set using the drive assembly’s multi-purpose Scroll/Select switch, or remotely from suitable control equipment. Additionally, the Park Air Virtual Front Panel (VFP) software can be used to set up the transmitter. Frequency Selection The transmitter is a single frequency synthesised radio that can operate with 25 kHz and 8.33 kHz channel spacing.
Intentionally Blank
Specification
General Specification The general specification applies to the transmitter irrespective of the selected operating mode. Variants Only one variant of the T6T 300 watt transmitter is available as detailed in Table 2. Table 2 300 Watt T6T Transmitter Description Part Number Frequency Range Special Applications 300 watt, standard frequency coverage, high stability, VHF transmitter B63300HS 118 to 136.
Dimensions and Weight The transmitter consists of one drive assembly, three amplifiers and a combiner. Transmitter The dimensions and weights quoted below are for a complete transmitter (that is a drive assembly plus three amplifiers): Width 483 mm (19 inches). Height 622.3 mm (24.5 inches). The height occupies 14U of equipment cabinet space. Depth 430 mm (16.9 inches) measured from front panel to rear panel. 465 mm (18.3 inches) measured from front panel to rear RF connectors.
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. ETSI test methods specified in EN 300 676 are used where applicable. Transmitter RF Characteristics Output Impedance 50 ohm via an N-type connector. RF Power Output The RF carrier output power is adjustable in 6 W steps from 30 W to 300 W. As an option, the maximum selectable power can be limited.
Spurious Outputs Both modes Intermodulation Both modes The spurious outputs are less than -46 dBm for modulation depths up to 90%, measured more 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.
Residual FM Both modes VOGAD AM-Voice mode AM-MSK mode Mute AM-Voice mode AM-MSK mode Differential Group Delay AM-MSK mode 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 with the threshold level set at 10 dB below the average speech line level setting. Within the VOGAD range the modulation depth remains at the set level ±10%.
Mode 2 Mode 2 parameters are identical to AM-Voice mode with the following exceptions. RF Power Rise Time The transmitter produces more than 90% of full power output within the first 2 symbols of the power stabilization segment, which is the first segment of the training sequence and consists of 4 symbols each representing 000. RF Power Decay Time The output power decays by more than 20 dB within 2.5 symbols of the middle of the final symbol. Channel Spacing 25 kHz channel spacing only.
Mode 3 Mode 3 parameters are identical to AM-Voice mode with the following exceptions. RF Power Rise Time The transmitter produces more than 90% of full power output within the first 2 symbols of the power stabilization segment, which is the first segment of the training sequence and consists of 4 symbols each representing 000. RF Power Decay Time The output power decays by more than 20 dB within 2.5 symbols of the middle of the final symbol. Channel Spacing 25 kHz channel spacing only.
Operation
Overview This topic describes the transmitter’s controls and indicators and details how to adjust the operational settings. The transmitter comprises a drive assembly, three amplifiers and a combiner. All operational settings are made at the drive assembly’s front panel.
T6T VHF Amplifier There are no operating controls fitted to the amplifier. All operational settings are made at the drive assembly. The amplifier has three front panel indicators as detailed in Fig 6 and a rear panel Supply switch. Should an amplifier fail, shown by the Alarm indicator being lit, the transmitter continues to operate at reduced power (200 watts). Ready. A green indicator that lights when the amplifier is ready for use and no BIT faults have been detected. Alarm.
Rear Panel Supply Switch The rear panel Supply switch (Fig 7) is a 2-way rocker switch used to select between power on, and standby. WARNING Dangerous Voltage When the Supply switch is set to the Standby position, dangerous voltage is still present in the internal power supply circuitry. To ensure safe working, the amplifier must be isolated from the ac and dc input supplies.
Drive Assembly The transmitter’s operational settings are made from the drive assembly’s front panel (Fig 8). The following pages describe the controls and detail how to set up the transmitter to suit the operational requirement. No attempt to set up the transmitter must be made until all procedures detailed in the Installation topic have been completed.
Front Panel Controls and Indicators The drive assembly front panel controls and indicators are shown in Fig 9. LCD Scroll/Select Switch READY ALARM REFERENCE F r e q 1 1 8 .0 0 0 M H z Ch 100 +7.3kHz Mode AM Voice Pwr TRANSMIT 1 STANDBY SCROLL/ SELECT MICROPHONE/ DIAGNOSTICS Fig 9 Front Panel Controls and Indicators Scroll/Select Switch and LCD The Scroll/Select switch is used in conjunction with the Liquid Crystal Display (LCD) to select most of the transmitter's operational settings.
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 46.
Table 5 Microphone/Diagnostics Connector - PC Connections Pin Number Input or Output Signal 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 Supply Switch The rear panel Supply switch (Fig 10) is a 2-way rocker switch used to select between power on, and standby.
Setting Up and Operation Setting up the transmitter involves using the front panel Scroll/Select switch to specify the operating parameters. Operating parameters can also be set using the Virtual Front Panel (VFP), through a Multi-Access Remote Control (MARC) system, or from an associated T6 controller. VFP operation is described on this CD under Maintenance; MARC and T6 controller functionality is described in separate documentation.
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.
F r e q 1 1 8 .
Menu Lock Screen A security facility available only from the VFP allows the drive assembly front panel to be ‘locked’. When this facility is active, no operational settings can be made from the front panel until an ‘unlock’ command is sent from the VFP. The following screen is displayed when ‘lock’ is active, and the front panel switch is pressed. S E C U R I F r T Y o n t M E S S A G E P a n e l L o c k e d O K To exit the system lock screen: ❑ Select OK, then press the switch.
Notes for Setting Up the Transmitter The following notes should be read before setting up the transmitter. They advise on the special frequency display when using 8.33 kHz channel spacing, and give guidance on the optimum line level settings. Note that for operation in the United States of America, this equipment is certified only for operation using 25 kHz channel spacing. Front Panel Display for 25 kHz and 8.33 kHz Channel Spacing When setting the operating frequency of the transmitter and 8.
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.
Changing the Transmitter’s Operating Frequency The transmitter’s frequency can be changed in two ways: either from the frequency screen, or by recalling a preset channel. This procedure details the use of the Frequency screen. (1) From the Control screen, select frequency to display the Frequency screen. (2) Turn the switch to highlight the digit to be changed, then press the switch. (3) Turn the switch until the required digit is shown, then press the switch.
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. Press the switch.
To Initiate a BIT Test Use the following procedure to initiate an interruptive BIT test from the drive assembly front panel. A BIT test cannot be initiated while the transmitter is keyed. After a BIT test has been run, the BIT screen is displayed (see AM-Voice and AM-MSK BIT Screen on page 57). 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.
(4) On completion, and if the interruptive test was initiated from the front panel, one of the following screens will be shown. T e s t S t a t u s P A S S O K T e s t S t a t F A I u s L O K (5) Selecting OK takes the user back to the BIT screen. The user can then scroll through the screen to check out transmitter parameters for failure. Standby Mode Standby mode is a power saving feature that can be used for non-operational transmitters.
Settings Operational settings for the transmitter are configured at the front panel, through the VFP, or 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.
Table 8 Operational Settings from the Front Panel Parameter Mode Adjustment Range Factory Default Setting Further Reference Menu lock screen All Locked or unlocked Unlocked page 40 Enter standby mode All Yes or No - page 46 Exit standby mode All Yes or No - page 46 Set mode of operation All AM-Voice, AM-MSK, Mode 2 or Mode 3 AM-Voice page 47 Set polarities AM-Voice, AM-MSK STD or INV STD page 53 Band edges All 118.000 to 136.975 MHz 118.000 and 136.
AM-Voice Settings Procedure During this procedure, the following parameters, applicable to AM-Voice operation, can be set: ❑ RF power output ❑ Audio line input level ❑ Inhibit (on or off) ❑ PTT on (key) or off (de-key) ❑ Transmitter time out ❑ Modulation depth ❑ Mute (on or off) ❑ VOGAD (on or off) ❑ Antenna change-over delay (on or off) ❑ Offset ❑ Step ❑ Mic (active or passive) ❑ Key priority (local or remote) ❑ Enable or disable local PTT ❑ Enable or disable remote PTT ❑ Ena
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 t T6T 300 Watt VHF Transmitter 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 Enabled or Disabled. Return to Settings screen. B a c k E x i V E See Offset Carrier Operation on page 42.
AM-MSK Mode Settings Procedure During this procedure, the following parameters, applicable to AM-MSK operation, can be set: ❑ RF power output ❑ Audio line input level ❑ Inhibit (on or off) ❑ PTT on (key) or off (de-key) ❑ Transmitter time out ❑ Modulation depth ❑ Antenna change-over delay (on or off) ❑ Key priority (local or remote) ❑ Enable or disable local PTT ❑ Enable or disable remote PTT ❑ Enable or disable remote phantom PTT.
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.
Polarities Screen AM-Voice and AM-MSK A number of remote indication and control signals can be hardwire connected to the transmitter. These signals, which can have their polarities set to standard (STD) or inverted (INV), are listed in Table 9. The Polarities screen is accessed from the Settings screen. AM-Voice and AM-MSK Polarity Settings Each of ten polarity settings applicable to AM-Voice and AM-MSK can be set to the default STD (standard) or INV (inverted) setting.
Table 9 AM-Voice and AM-MSK Polarity Settings Signal Connector Polarity set to STD Polarity set to INV Ready Out Facilities, pin 13 An open collector grounded output when the radio is ready to transmit and no BIT faults are detected. 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. Inhibit In Facilities, pin 10 TTL input.
Table 9 AM-Voice and AM-MSK Polarity Settings (Continued) Signal Connector Polarity set to STD Polarity set to INV Fast PTT Output (antenna change-over) 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. Maximum input level ±60 V with respect to PTT reference. Input will draw no more than 6 mA, and requires at least 1 mA to operate.
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) or INV (inverted) setting. The signal connections are detailed in Table 10 along with the conditions when STD or INV is selected.
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 D C i a t 0 0 0 0 0 : S u p p i t l y O N 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 Shows state of ac supply (On or Off). i l PA temperature -20°C to +150°C. P A S S Pass, Fail or Not Tested. > > P A S S Pass, Fail or Not Tested.
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.
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). E x i t > > S u p p l S y n t y h 2 8 V L o c k P A T e m p E x i t P A C o o P A S S 5 0 d e g C < < l i n g V S W R L o o p E x i E r r o r t Shows value of dc supply.
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 S t . T X a b i l i S o f t w a r x x x x x x x x / E x i t B a s e S o f t w a r x x x x x x x x / E x i t M o d e S o f t w a r x x x x x x x x / E x i t F i l 1 t i p t t T6T 300 Watt VHF Transmitter i > > e 65-xxxxxxxx represents the software part number and /v v represents its version. v v > > e Current mode running.
Band Edges The frequency range of the T6T 300 watt 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 .
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.
Table 12 Functions and Parameters Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting ✔ ✔ ✔ ✔ ✔ ✔ 118.
Table 12 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 Modes) MAC TM1 (inter access d
Table 12 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 input polarity (All modes) ✔ ✔
Table 12 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 STANDBY Enter and exit standby facility SOFTWARE CONFIGURATION View the transmitter’s software configuration LOCK FACILITIES T6T 300 Watt VHF Transmitter Page 66 Operation
Installation
Warnings and Cautions WARNING Dangerous Voltage The instructions given in this topic involve connecting dangerous voltage to the transmitter and should be carried out only by suitably qualified personnel. WARNING Dangerous Voltage The equipment is permanently connected to the mains supply when the mains connectors are attached. Switching the rear panel Supply switch to off does not isolate all internal circuits from the mains supply.
Introduction The procedures necessary to install a transmitter are listed in Table 13. Installation is in two parts: Steps 1 to 9 in Table 13 must be completed irrespective of how the transmitter is to be configured; step 10 provides a selection of different configurations. . Table 13 Installation Procedures Step Procedure Reference 1 Read and understand the warnings and cautions given on page 68. 2 Perform an initial inspection of the transmitter and fit the correct ac input fuse.
Fuses and Connectors The following list details the equipment supply fuses and connectors. Some of the connectors (depending on your particular configuration) are required during installation. Table 14 Fuses and Connectors Component Type Park Air Part Number Fuses: AC input fuses, F3 and F4 for 110-240 V input AC input fuse, F2 for 110-240 V input T6.3AH, 250V T3.
Installing the Transmitter Initial Inspection of the Transmitter The transmitter comprises: ❑ One T6T VHF drive assembly ❑ Three T6T VHF amplifiers ❑ One T6T VHF combiner ❑ One phasing harness. On receipt of the transmitter, remove all transit packaging and check that there is no damage. If damage is evident, contact Park Air immediately and retain the original transit packaging. Fitting the Correct ac Input Fuses The mains input fuses are an integral part of the rear panel ac connectors.
Fitting the Drive Assembly and Amplifiers into an Equipment Cabinet Caution Mechanical Support It is essential that the chosen mechanical installation provides adequate support along the depth (front to rear) of the unit. The transmitter must not be supported by the front panel; doing so can cause damage. The drive assembly and the three associated amplifiers, which occupy 14 U of cabinet space, should be installed in an equipment cabinet in the order shown here.
Connecting the Amplifiers to the Drive Assembly Having fitted the drive assembly and amplifiers into a cabinet, the units must be interconnected, as shown in Fig 17, using the supplied phasing harness, part number 17L13000006. The connections that must be made are listed in Table 15. Fig 13 shows the amplifier rear panel connectors CN5 and CN8. Fig 14 shows the drive assembly rear panel and Amplifier Out connectors.
Fitting and Connecting the Combiner Fitting The combiner, shown in Fig 15, should be mounted at the back of the cabinet directly behind the amplifiers’ fans and with the heatsink pointing into the cabinet. Cabinet mounting holes are provided in the combiner’s bracket to allow fixing to a cabinet upright. Fig 16 shows a plan view of the mounting arrangement.
Connecting A coaxial cable connects each amplifier to the combiner’s three inputs (marked IN) as shown in Fig 17. These cables are part of the phasing harness, part number 17L13000006. Caution Critical Length Cables The cables used to connect from the amplifiers to the combiner are critical length. Use only the cables supplied by Park Air. Connecting the Antenna The combiner’s antenna connector is an N-type socket suitable for connecting a 50 ohm antenna.
Amplifier 1 Antenna CN8 Antenna CN5 Facilities Amplifier 2 CN8 Combiner Antenna CN5 Facilities 1 2 Ant 3 Amplifier 3 CN8 Antenna CN5 Facilities Phasing Harness (17L13000006) Drive Assembly CN3 CN2 CN1 CN6 CN5 CN4 Fig 17 300 Watt Transmitter Interconnections T6T 300 Watt VHF Transmitter Page 76 Installation
Connecting the Chassis Stud WARNING Chassis Earth A chassis stud is fitted to each amplifier’s rear panel and to the drive assembly. This stud is used to connect the equipment to the equipment cabinet, or to the user's system earth point. The stud must not be used as the safety earth.
Connecting the AC Input Supply WARNING Dangerous Voltage The equipment is permanently connected to the mains supply when the mains connectors are attached. Switching the rear panel Supply switch to off does not isolate all internal circuits from the mains supply. For this reason, a mains isolating switch should be fitted close to, and easily accessible from, the transmitter's position.
