Table of Contents
Advertisement
Quick Links
Antenna Mount Amplifier
For Satellite Communications
Operation Manual
Type STA2000 Series
Whilst e2v technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof
and also reserves the right to change the specification of goods without notice. e2v technologies accepts no liability beyond the set out in its standard conditions of sale in
respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein.
e 2v technologies (uk) limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU United Kingdom Holding Company: e2v technologies plc
T elephone: +44 (0)1245 493493 Facsimile: +44 (0)1245 492492
Contact e2v by e-mail:
enquiries@e2v.com
or visit
www.e2v.com
for global sales and operations centres.
© e2v technologies (uk) limited 2010
DAS768892AA Version 1, March 2010
108210
Advertisement
Table of Contents
Related Manuals for stellar labs STA2000 Series
Summary of Contents for stellar labs STA2000 Series
- Page 1 For Satellite Communications Operation Manual Type STA2000 Series Whilst e2v technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also reserves the right to change the specification of goods without notice. e2v technologies accepts no liability beyond the set out in its standard conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein.
-
Page 2: Safety Notes
This Operation Manual covers the following amplifier type numbers: STA2175, STA2275, STA2375, STA2T45, STA2450 Series (including all derivatives). SAFETY NOTES The following warnings and precautions are for your safety and the prevention of injury. Please read them carefully and observe at all times when installing or operating a Stellar Travelling Wave Tube Amplifier. - Page 3 High Voltage High voltages in excess of 11.5kV are present within the amplifier. However, the equipment is designed so that personnel cannot come into contact with high voltage circuits unless the covers are removed. Access inside the amplifier is restricted to suitably skilled engineers. RF Radiation Exposure of the human body to microwave radiation can constitute a hazard (ANSI/IEEE C95-1- 1992).
- Page 4 CUSTOMER CARE Stellar 24-Hour Hotline In the event of a Stellar product operational problem or urgent application enquiry: 1. Complete a Product Service Report Form before calling the Hotline. A copy can be found at the back of this manual. 2.
-
Page 5: Table Of Contents
CONTENTS THANK YOU FOR BUYING STELLAR......................7 RANGE OF OPTIONS ........................7 CARE OF YOUR AMPLIFIER ........................9 STORAGE............................9 HANDLING............................9 UNPACKING ............................9 CLEANING ............................9 MAINTENANCE ..........................9 INSTALLATION CONSIDERATIONS ..................... 10 MOUNTING............................10 RF CONNECTIONS ......................... 11 COOLING CONSIDERATIONS ....................... 11 3.3.1 Some Cooling Facts and Figures .................... 11 3.3.2 Ducting Considerations ...................... - Page 6 6.2.7 Message Timing ........................29 6.2.8 Summary of Command Messages ..................29 EXAMPLES OF COMMAND AND RESPONSE MESSAGES............30 6.3.1 Simple Command Message (no return of data) ..............30 6.3.2 Command Messages Requesting data ................... 31 6.3.3 Universal Command Messages Requesting Data..............31 6.3.4 Command Messages Requesting Longer Data Strings ............
-
Page 7: Thank You For Buying Stellar
(RCCB) (see section 3.4). NG OF OPTIONS he STA2000 series of antenna mount amplifiers includes the following RF system options (see gures 1 and 2). • Low gain (no solid-state pre-amplifier). - Page 8 Figure 1 Figure 2 © e2v technologies (uk) limited 2010 DAS768892AA Version 1, page 8...
-
Page 9: Care Of Your Amplifier
CARE OF YOUR AMPLIFIER STORAGE • Store the amplifier in its normal horizontal or ientation. • Storage temperature is from –40 to –80˚C • Do not use amplifier bo xes to support the weight of any other item. • Retain the amplifier boxes for future use. -
Page 10: Installation Considerations
TALLATION CONSIDER ATIONS OUN ING The amplifier can be: • Used free standing. • Mounted in a flight case. • Mounted on the roof of a vehicle. • Mounted to an antenna system. The amplifier has six M6 mounting points (three each side, 10 mm maximum depth), which can be used to mount the amplifier solidly to the chosen platform (see figure 3). -
Page 11: Rf Connections
RF C N O NECTIONS RF i nput and output connections are made via waveguide connectors on opposite ends of the lifier. • C-Band. Waveguide type WG14 should be used. The RF output is CPR 137F, with eight tapped holes 10-32 UNF-2B (maximum internal thread depth 8mm). The amplifier is provided with sufficient bolts for this flange. -
Page 12: Ducting Considerations
inspection is made of the installation cooling system. The amplifier should be left for 20 minutes before any attempt is made to restart. Following an over-temperature condition, the TWT COLLECTOR TOO HOT or CASE TOO HOT fault conditions are set. These conditions can be monitored via the user interface or accessed through the serial communications port (se e sections 5 and 6). -
Page 13: Commissioning The Installation
• In any system, prevent hot exhaust air from re-circulating to the air inlet, otherwise the inlet air temperature will increase, resulting in potential thermal runaway. This is a prime consideration when designing common ducting systems for multiple amplifiers. 3.3.4 Commissioning the Installation When commissioning the installation, the temperature difference... -
Page 14: Earthing
Under the conditions of a low voltage power source and long power connections leads, it may be necessary to select a cable for its low voltage drop rather than a selection based on the nominal current rating requirement (refer to local wiring regulations). 3.4.2 Earthing An external protective earth conductor providing protection against RF and tran... - Page 15 As the amplifiers do not have a master/slave relationship, the position of the wav eguide switch is pre- selected by the use r either manually, via the user interface or from the N6143 control unit. The low power alarms on b oth amplifiers should be set if required and then both amplifiers placed in the transmit state.
-
Page 16: Basic Operation Of The Amplifier
BASIC OPERATION OF THE AMPLIFIER APPLYING THE MAINS VOLTAGE Before applying the mains supply to the amplifier, the operator must be satisfied that: • Both the RF input and RF output connections are correctly terminated (see section 3.2). • Safety and cooling requirements are complied with (see safety not es and section 3.3). -
Page 17: Amplifier Transmit State
4.3.4 Amplifier Transmit State With the amplifier in the standby state, selecting the transmit state results in the application of helix and collector voltages to the TWT, allowing RF transmission . In the transmit state, the RF output ower and the TWT helix current monitor features are operational and the control of gain is possible using the (optional) Digital Electronically Variable Attenuator. -
Page 18: User Interfaces
USER INTERFACES The amplifier is provided with two control interfaces, the user port and the serial communications interface (RS-485, 2 or 4-wire). All interfaces are available on the 41-pin control connector, located next to mains supply connector. This section identifies each control connector pin and describes the function of each pin, including the electrical specification. -
Page 19: User Interface Features
USER INTERFACE FEATURES 5.2.1 Indicator Outputs – Type 1 Normally open relay contact outputs switched to GND (pin P on the user interface connector) when condition is true. Example 1 Amplifier in the off state is indicated by pin A on the user interface connector closing to pin ‘P’. -
Page 20: Indicator Outputs - Type 2
5.2.2 Indicator Outputs – Type 2 Normally open relay contact outputs switched to GND (pin P on the user interface connector) when conditions is false. Example Unit is operating normally with no fault condition when pin k on the user interface connector is closed to pin P. -
Page 21: Control Inputs - Type 2
5.2.5 Control Inputs – Type 2 The following control inputs are of the level active type. The inputs are internally pulled up to +12V by 3k3 resistors. Maximum external switch ‘on’ resistance .................100 Ω AUTO ENA Part of the redundant switch control facility, toggling between the automatic and manual change over mode. -
Page 22: Miscellaneous Functions
Address code Address (Hex) 0000 0001 0010 1110 1111 ADD SEL Allows the user to select the method of setting the serial communications device address. The address can be set either in hardware using the ADD 0 to ADD 3 lines above, or in software over the serial interface itself (see section 6.1.12). -
Page 23: Rs-485 Serial Bus
RS-485 SERIAL BUS GENERAL DESCRIPTION AND FEATURES The amplifier is equipped with a RS-485 interface allowing connection as a slave to an asynchronous, half-duplex, multi-drop, four-wire bus. This gives full remote control and monitoring of the amplifier as part of an integrated system. The following section describes the main features, protocols and operation of the amplifier with the multi-drop serial bus. - Page 24 HV overload Indicates that the amplifier has seen an internal HV overload fault trip. The amplifier will revert to the fault state and automatically attempt to reset three times. For full reset details see section 5.2.1. External interlock Indicates that the external interlock input is asserted. This prevents the amplifier from entering the transmit state until the input becomes unasserted.
-
Page 25: General Amplifier Control
6.1.3 General Amplifier Control The following simple command messages that do not have an associated return of data, allow basic control of the amplifier. (See section 6.3.1 for details of message format) Selects the amplifier off state. Standby Selects the amplifier standby state. If selected from the off state, results in the automatic initiation of the cathode heater warm-up timer (180 seconds, or 10 minutes if below -10ºC). -
Page 26: Rf Control
6.1.8 RF Control The following simple command messages that do not have an associated return of data allow control of the RF by switching on or off the power supply to the active RF input components, if fitted (see section 6.3.1 for details of message format). Enable RF Cancels the RF inhibit mode, described below. -
Page 27: Rf Band Selection
Set baud rate Allows the baud rate to be set in nominal units between 1 and 6 1 = 600 2 = 1200 3 = 2400 4 = 4800 5 = 9600 6 = 19200 (see section 6.3.4 for details of passing parameters). Go to local A simple command message that places the amplifier into the local mode, allowing control via the ‘user interface’... -
Page 28: Protocol
PROTOCOL 6.2.1 Interface and Termination The serial interface is RS-422/485 compatible 2/4-wire with no receiver biasing option. As the amplifier dos not contain transmitter or receiver termination, the local serial communications bus should be fitted with 120R ±1%, ¼W carbon film or similar termination resistors between pin d (RX+) and pin e (RX-), also between pin b (TX+) and pin c (TX-) of the 41-pin amplifier control connector. -
Page 29: Command Message Format
6.2.5 Command Message Format <STX> address command <ETX> checksum Command message with no qualifying data. <STX> address command data <STX> checksum Command message including a qualifying parameter 6.2.6 Response Message Format All valid command messages are acknowledged in the following forms. The address and command characters are a reiteration of those in the command message. -
Page 30: 6.3 Examples Of Command And Response Messages
Attenuator? High Power Alarm? Low power alarm? Transmit Set Address UC+p Set baud rate UC+p Type: user command UC+p user command with parameter user status/data request Note: Input power is not monitored. Data requests will be serviced with the amplifier in either local or remote mode. However, for other commands to be executed, (with the exception of remote enable) the amplifier must be in remote mode. -
Page 31: Command Messages Requesting Data
6.3.2 Command Messages Requesting data Command ASCII Warm-up Time? Next helix current record? Helix current? Elapsed hours? Forward power? Attenuator? High Power alarm? Lower power alarm? Command <STX> address H <ETX> checksum ASCII <STX> 5H <ETX> l 02 35 48 03 7C Response <ACK>... - Page 32 The status response comprises 9 data bytes defined as follows. D1 to D3 are data bytes representing the operational status of the amplifier Function Function bit 7 Parity bit 7 Parity bit 6 bit 6 bit 5 bit 5 bit 4 Fault bit 4 bit 3...
-
Page 33: Command Messages Requesting Longer Data Strings
6.3.4 Command Messages Requesting Longer Data Strings The command J (elapsed hours?) returns longer data strings than other commands. The format is as follows: Command ASCII Elapsed hours? Command <STX> address J <ETX> checksum Response <ACK> address J Tnnnnn Xnnnnn Snnnnn Onnnnn <STX> checksum Where Tnnnnn –... -
Page 34: Application Notes
D1 is a byte representing the invalid command code. It is defined as follows: Function bit 7 Parity bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 = command not executed 0 = command/data invalid APPLICATION NOTES Before attempting to control the amplifier using the RS-485 4-wire multi-drop bus, check the following: •... -
Page 35: Related Documents
RELATED DOCUMENTS IDENTITY TITLE STA2T45 Series Data sheet, Stellar 450W Tri-Band Antenna Mount TWTA STA2175 Series Data sheet, Stellar 750W C-Band Antenna Mount TWTA STA2275 Series Data sheet, Stellar 750W X-Band Antenna Mount TWTA STA2375 Series Data sheet, Stellar 750W Ku-Band Antenna Mount TWTA STA2450 Series Data sheet, Stellar 500W DBS-Band Antenna Mount TWTA HBN6143-1... -
Page 36: Appendix A
APPENDICES APPENDIX A Dual Amplifier Redundant Configuration using N6143 Controller If the requirement is for a two-amplifier redundant system, the following wiring can be used. A personal computer can be used in place of the N6143 controller; commands and protocols are detailed in this manual. -
Page 37: Appendix B
APPENDIX B Dual Amplifier Redundant Configuration with Manual Control Basic control functions can be obtained by using manual toggle switches. An example of the interface wiring for this is as follows: © e2v technologies (uk) limited 2010 DAS768892AA Version 1, page 37... -
Page 38: Appendix C
APPENDIX C This circuit is connected to the indicator outputs OFF IND, WARMUP IND, STBY IND, XMIT IND and SUM FLT IND as described in Section 5.2.1. © e2v technologies (uk) limited 2010 DAS768892AA Version 1, page 38... -
Page 39: Appendix D
APPENDIX D Single Amplifier Configuration with N6143/N6081D Controllers If operating in single amplifier mode, the remote interfacing becomes easier to provide. A simple RS- 485 link is required between the amplifier and the controller to give full functionality. The dual amplifier controller (N6143) can still be used in this set-up as it is fully configurable to either single or dual amplifier mode of operation. -
Page 40: Appendix E
APPENDIX E Single Amplifier Configuration with Manual Control When operating in single amplifier mode with no serial bus controller, it is possible to provide full control manually as shown below. Notes 1. If switch 2 is set to XMIT on application of prime power, the amplifier will automatically enter the XMIT state after 3 minutes of warm-up.
Need help?
Do you have a question about the STA2000 Series and is the answer not in the manual?
Questions and answers