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MCL TN440-3 Technical Note

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Mark Schmeichel
Engineering
Lars E. Agner
Sales
TN4400-3
Technical Note
Operation of MT4400 TWTA
August, 10, 2004
8/13/04
Date
8/16/04
Date

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Summary of Contents for MCL TN440-3

  • Page 1 TN4400-3 Technical Note Operation of MT4400 TWTA August, 10, 2004 Mark Schmeichel 8/13/04 Engineering Date Lars E. Agner 8/16/04 Sales Date...

  • Page 2: Table Of Contents

    Prevention of Excessive RF Input Power ............... 28 HPA INITIAL TURN ON ......................31 Initial Turn-On Check List....................31 Operating Caution List....................32 Power-Up Procedure – Remote Panel Usage..............32 SHUT DOWN PROCEDURE ....................35 TN4400-3 MCL, INC. 2 of 36...
  • Page 3 TECHNICAL NOTE – OPERATION OF MT4400 TWTA 08/10/2004 LIST OF APPENDICES APPENDIX A - 40A1546 CSP Protocol Specification APPENDIX B - 40A1715 SABus Compatible Protocol Specification APPENDIX C - 46A0204 CSP Command Set APPENDIX D - 46A0203 SABus Command Set TN4400-3 MCL, INC. 3 of 36...

  • Page 4: Safety Summary

    NOTE An essential operating or maintenance procedure, condition, or statement which must be highlighted. TN4400-3 MCL, INC. 4 of 36...

  • Page 5: General Safety Precautions

    Use of compressed air for cleaning can create an environment of propelled foreign particles. Air pressure shall be reduced to less than 30 psi and used with effective chip guarding and personnel protective equipment. TN4400-3 MCL, INC. 5 of 36...

  • Page 6: List Of Hazards

    RF drive, to avoid the RF hazard should the TWTA oscillate. WARNING BERYLLIUM OXIDE The dust or fumes from Beryllium Oxide (BeO) ceramics used in microwave tubes are highly toxic and can cause serious injury or death. TN4400-3 MCL, INC. 6 of 36...
  • Page 7 RF OVERDRIVE – BLOCK UP CONVERTER OPTION Never operate the MT4400 without the external semi-rigid cable that connects to the tube input connector. Operating without this cable may lead to a tube overdrive condition. TN4400-3 MCL, INC. 7 of 36...

  • Page 8: Scope

    MT4400 HPA. This manual assumes a familiarity and working experience with high power microwave RF amplifiers. The MCL MT4400 is designed for long and reliable life under extreme environmental conditions. All components utilized in this system are conservatively rated and selected for high reliability and maximum use of existing designs.

  • Page 9: Discrete Control

    There are two functions for this item. First, if sent while the HPA is in the Filament Off state filament delay will be initiated. Second, if sent while the HPA is in the Transmit state the HPA will switch to the Standby state. TN4400-3 MCL, INC. 9 of 36...
  • Page 10 3.4.11 RF Low Flag This Flag along with the summary alarm flag will be set to true when the detected forward power is lower than the user specified level. TN4400-3 MCL, INC. 10 of 36...
  • Page 11 Auto Power function. 3.4.20 Auto Power Command This command is used to regulate the HPA output power within a certain specified window. This command can also be used to change the HPA output power level. TN4400-3 MCL, INC. 11 of 36...

  • Page 12: Hpa Operation

    Interface cannot change the operating state of the HPA, but they can still get status. From the Remote panel the operator can pass control to or take control away Locally or from the Computer Interface. TN4400-3 MCL, INC. 12 of 36...
  • Page 13 9600 1200, 2400, 3600, 4800, 9600, 14400, 19200, or 28800 *Not Available on all Models-Contact MCL for Details 4.1.3.1 Protocol & Command Set The Protocol specifications and command sets for both CSP & SAbus are attached to this document as appendices.

  • Page 14: Hpa Operating Modes

    28800 COMP HARDWARE RS485 RS485 or RS232 *Not Available on all Models-Contact MCL for Details 4.1.4.3 Protocol & Command Set The Protocol specifications and command sets for both CSP and SAbus are attached to this document as appendices. HPA Operating Modes The following paragraphs describe the operating states of the HPA.
  • Page 15 Transmit Selected will be indicated in two ways on the Remote panel during the proportional delay. First an indication will appear on the front panel vacuum fluorescent display (VFD), and second, the Transmit LED located on the Transmit button will flash. TN4400-3 MCL, INC. 15 of 36...

  • Page 16: Rf On/Off Control

    (press Accept button to clear). ALARMS Summary Tube Temperature P.S. Temperature Filament Foldback HPA Overdrive* Tube Overdrive* RF Reflected RF Low RF High Function available with optional SSA. TN4400-3 MCL, INC. 16 of 36...
  • Page 17 (see the “Adjustment Menu Screen” paragraph of this document). The window size must be greater than five times the number of faults counted in seconds. × Window Size onds number faults TN4400-3 MCL, INC. 17 of 36...

  • Page 18: Hpa Gain Control (Optional)

    Power set level. There are several conditions that can prevent turn on of Auto Power or can turn it off when it is on. 4.5.2.1 Initializing Auto Power (Not available on some Multi-Band HPA—Please Consult MCL) On the Computer and Remote Interfaces an Auto Power command has been provided which turns on Auto Power and sets the regulation level.

  • Page 19: Diagnostic Interface

    The MT4400 also has optional sub-band Linearizer tuning available on some models. Typically a Linearizer is adjusted for the best broadband performance, The MT4400 can be optimized within a band for possible further improvement. Please contact MCL for details on sub-band tuning.
  • Page 20 Number and download time. The database can therefore handle multiple HPAs. Access 2000 can be used for advanced charting and reporting of this data. The file is stored in the application directory under filename hpa-log.mdb. TN4400-3 MCL, INC. 20 of 36...
  • Page 21 To save the data to disc, once the status is done downloading, click on the “File” menu, select “Save” on that menu, then on the Save menu select “Status.” The diagnostic program will automatically produce a file name, which includes the HPA serial number, “settings,” and today’s date TN4400-3 MCL, INC. 21 of 36...
  • Page 22 Click on the “File” menu, select “Open” on that menu, then on the Open menu select “Settings,” then select the setting file and click OK. Click on the “Set All” button. The status bar on the bottom of the screen should say “Cmd: Accepted” when the upload is complete. TN4400-3 MCL, INC. 22 of 36...
  • Page 23 HPAs. Access 2000 can be used for advanced charting and reporting of this data. The file is stored in the application directory under filename hpa-log.mdb. 45A0189 may differ slightly TN4400-3 MCL, INC. 23 of 36...
  • Page 24 Once the tables are done downloading, click on the “File” menu, select “Save” on that menu, then on the Save menu select “Calibration.” The diagnostic program will automatically produce a file name that includes the HPA serial number, “cal tables,” and today’s date. 45A0189 may differ slightly TN4400-3 MCL, INC. 24 of 36...
  • Page 25 “Save” on that menu, then on the Save menu select “Data Log.” The diagnostic program will automatically produce a file name that includes the HPA serial number, “data log,” and today’s date. 45A0189 may differ slightly TN4400-3 MCL, INC. 25 of 36...
  • Page 26 If more advanced graphing is desired it should be done using Access 97 or better. NOTE If the number of data points exceeds 1000 points, slower computers could take a long time to draw the graph. No Available in 45A0189 TN4400-3 MCL, INC. 26 of 36...

  • Page 27: Optional Linearizer

    4.9.2 Other Redundant Systems All other redundant systems whether they are MCL systems (such as MT4412, MT44PC, . . .) use only a small portion of the signals on J8. Depending on the system type the Switchover Fault relay output will indicate the state of the MT4400, the RF Off input would be used during switching, and/or the RF Low Switching input would be used to turn on switching for a RF Low alarm.

  • Page 28: Discrete Interface J5

    This level can be found on a warning tag (see the following figure) attached to the front of each unit as well as in the system test data. TN4400-3 MCL, INC. 28 of 36...
  • Page 29 TECHNICAL NOTE – OPERATION OF MT4400 TWTA 08/10/2004 TN4400-3 MCL, INC. 29 of 36...
  • Page 30 TWTA. MT4400 Trip Levels The Tube Overdrive Fault and the Tube Overdrive Alarm levels were set by MCL to protect the TWT. If the Tube Overdrive Alarm occurs, this is an indication to the operator that the tube drive level is approaching the Tube Overdrive Fault.

  • Page 31: Hpa Initial Turn On

    HPA INITIAL TURN ON The following procedure should be performed the first time the HPA is turned on after receipt from MCL or after it has been in storage. Initial Turn-On Check List All MT4400 TWT amplifiers are ready to be activated when the following check list has been complied with: The installation procedure found in TN4400-2 –...

  • Page 32: Operating Caution List

    Verify that the HPA is in the filament delay and will not go into Transmit without operator interaction. Check that Delay is indicated by the Status LED flashing Yellow. Send an RF Inhibit Command. Set the attenuation level to 32.0 dB. TN4400-3 MCL, INC. 32 of 36...
  • Page 33 RF power to insure that the transmission line is reflecting less than 10% of the output forward power. If the system reaches rated output before reaching maximum gain, it will be necessary to further reduce the RF output of the exciter. TN4400-3 MCL, INC. 33 of 36...
  • Page 34 If problems occur during the execution of this procedure, refer to TN4400-6 – Technical Note, Troubleshooting & Customer Service Guide for MT4400. TN4400-3 MCL, INC. 34 of 36...

  • Page 35: Shut Down Procedure

    Main AC Power circuit breaker to the Off position. This shutdown procedure is only for emergencies and should not be used under normal circumstances. If problems occur during the shutdown procedure, refer to TN4400-6 – Technical Note, Troubleshooting & Customer Service Guide for MT4400. TN4400-3 MCL, INC. 35 of 36...
  • Page 36 TECHNICAL NOTE – OPERATION OF MT4400 TWTA 08/10/2004 APPENDIX A - 40A1546 CSP Protocol Specification APPENDIX B - 40A1715 SABus Compatible Protocol Specification APPENDIX C - 46A0204 CSP Command Set APPENDIX D - 46A 0203 SABus Command Set TN4400-3 MCL, INC. 36 of 36...

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