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TECHNICAL NOTE – OPERATION OF MT4000 TWTA

10/24/03

TN4000-3

MCL, INC.

7 of 46

IMPLOSION HAZARD

Ceramic windows from microwave tubes can shatter on impact or crack in use
resulting in injury from Beryllium Oxide dust or fumes.

X-RAY RADIATION

High voltage tubes can produce dangerous, possibly fatal X-Rays.

HOT SURFACES

Surface temperature of tubes and other air cooled ports can reach several hundred
degrees centigrade.

RF OVERDRIVE

The unit may be damaged by drive levels as low as -17 dBm for the M/N MT4000
depending upon the settings of the system attenuator. Please apply RF with caution.
Always terminate RF input and output ports properly when AC power is supplied to
the TWTA.

CAUTION

WARNING

WARNING

WARNING

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Содержание MT4000 TWTA

Страница 1: ...TN4000 3 Technical Note Operation of MT4000 TWTA October 24 2003 Mark Schmeichel 10 24 03 Engineering Date...

Страница 2: ...ent 13 4 0 HPA OPERATION 21 4 1 HPA Control Modes 21 4 2 HPA Operating Modes 24 4 3 RF On Off Control 25 4 4 Faults Alarms 26 4 5 HPA Gain Control 29 4 6 Diagnostic Interface 31 4 7 Optional Local Int...

Страница 3: ...WTA 10 24 03 TN4000 3 MCL INC 3 of 46 LIST OF APPENDICES Appendix A 40A1546 CSP Protocol Specification Appendix B 40A1715 SA Bus Compatible Protocol Specification Appendix C 46A0204 CSP Command Set Ap...

Страница 4: ...s the WARNING or CAUTION is repeated throughout the text Prior to starting any task THE WARNINGS or CAUTIONS included in the text for that task should be reviewed and understood An operating or mainte...

Страница 5: ...tage supply turned on Under certain conditions dangerous potentials may exist when the power control is in the off position due to charges retained by capacitors To avoid injuries always remove power...

Страница 6: ...inside the unit Do not insert objects through air intake screen on rear of drawer When testing always ground the drawer chassis RF RADIATION Exposure to RF radiation may cause serious bodily injury p...

Страница 7: ...es can produce dangerous possibly fatal X Rays HOT SURFACES Surface temperature of tubes and other air cooled ports can reach several hundred degrees centigrade RF OVERDRIVE The unit may be damaged by...

Страница 8: ...d and selected for high reliability and maximum use of existing designs Mechanical and electrical safeguards are utilized throughout the system to insure safety of operating personnel 3 0 CONTROLS IND...

Страница 9: ...e HPA is in the Transmit state the HPA will switch to the Standby state the Yellow LED in the button will be continuously illuminated 3 1 4 Transmit Button LED While no faults are present if this butt...

Страница 10: ...data transmitted to the remote port 3 1 13 RF High LED The Yellow LED will illuminate when the detected forward power exceeds the user specified level 3 1 14 RF Low LED The Yellow LED will illuminate...

Страница 11: ...de the button is illuminated the amplifier is switched to the antenna port of the RF switch 3 1 21 Load Button LED When this button is activated though the 1 1 switchover this HPA will be put into the...

Страница 12: ...T4000 TWTA 10 24 03 TN4000 3 MCL INC 12 of 46 3 1 25 Accept Button This button will be used to select adjustable parameter on any screen 3 1 26 Menu Select Button This button is used to move between d...

Страница 13: ...4 03 TN4000 3 MCL INC 13 of 46 3 2 Front Panel Display Screen Content This figure shows an overview of the TWTA screens and the flow between these screens The following paragraphs describe each screen...

Страница 14: ...ent delay the first line of the normal operating screen will display the remaining filament delay time After filament delay time ends the RF forward power value will be displayed on the first line of...

Страница 15: ...l press the Accept button which will cause the selected screen to be displayed If the operator were to press the menu select button from this screen the normal screen would be displayed again 3 2 5 Ga...

Страница 16: ...yed If the operator were to press the menu select button from this screen the menu screen would be displayed again 3 2 7 Adjustment Edit Screen These screens are accessed from the adjustment menu scre...

Страница 17: ...table trip levels are exceeded causing an event entry the level that was exceeded will also be stored in the log and presented on the fourth line of the display The time resolution of the log will be...

Страница 18: ...Uncalibrated RF Forward Uncalibrated RF Reflected Uncalibrated Tube Drive Uncalibrated OPERATING STATES End of Log Standby Local RF Off Local RF On Transmit Remote RF Off Remote RF On Local Override O...

Страница 19: ...one at a time Once the cursor is pointing at the desired selection the operator will press the Accept button This will cause the edit screen for the selected line to be displayed see the next paragrap...

Страница 20: ...the operator can select which parameter to modify from those listed on this menu Notice there are seven menu parameters to select from but the screen can only display four at a time By rotating the kn...

Страница 21: ...se control modes are mutually exclusive the operational states of the MT4000 at any one time These interfaces are the Local panel Remote Interface J4 and Computer Interface J5 4 1 1 Local Control Whil...

Страница 22: ...ces 4 1 3 Computer Control 4 1 3 1 Control Priority While the HPA is in the Computer mode the operator at the Computer device will be allowed to control the HPA While in the Computer mode the Local pa...

Страница 23: ...40A1546 or SABUS 46A0203 40A1715 COMP ADDRESS Hexadecimal 01 01 through 7F CSP 31 through 7E SA7670 COMP BAUD RATE 9600 1200 2400 3600 4800 9600 14400 19200 or 28800 COMP HARDWARE RS485 RS485 or RS23...

Страница 24: ...OFF OFF OFF ON STANDBY OFF OFF ON OFF OFF OFF AFTER FILAMENT DELAY WITH A FAULT OFF OFF OFF OFF OFF ON TRANSMIT OFF OFF OFF OFF ON OFF DURING FAULT COUNTER CYCLE WITH TRANSMIT IMMINENT OFF OFF OFF ON...

Страница 25: ...as a power failure and then the HPA power returns After the power failure Transmit selected will be activated during filament delay if no faults are present during delay Second while the HPA is in the...

Страница 26: ...larm Alarms WILL NOT affect the operating state of the HPA All alarms are self clearing and do not require a Fault Reset except RF Switch Failed alarm which will latch until the Reset button is presse...

Страница 27: ...forced off Standby Transmit are disabled FAULTS Tube Temp Switch Chassis Interlock RF Reflected Tube Overdrive Helix Surge User Interlock W G Arc HV Over Volt Filament Under Current Tube Temp Analog...

Страница 28: ...Tube Drive Power meter 4 4 6 Tube Fault Counter Operation If the MT4000 is to be left in an unattended earth station or during a degassing operation or if the tube is nearing the end of it s life the...

Страница 29: ...nt All of these methods of adjust depend on the operator watching an indication of the HPA output power while making the adjustment Since the attenuator is in the input side of the HPA there is not a...

Страница 30: ...nditions occur The set Auto Power level exceeds the top Forward Power calibration point If the TWTA drops out of Transmit If a Disable Auto Power command is received while the TWTA is in the Computer...

Страница 31: ...ding and uploading data to the HPA The diagnostic interface program has information built into the Help menu to give the operator additional assistance The Windows cut paste functions are enabled on a...

Страница 32: ...ace program click on the Settings tab see the figure below 2 Click on the Download All Settings button to refresh the settings display 3 To save the data to disc once the status is done downloading cl...

Страница 33: ...g traffic or an interruption in service may occur The HPA must be in a maintenance mode to upload settings or an interruption of service may occur 2 On the Diagnostic Interface program click on the Se...

Страница 34: ...hat menu then on the Save menu select Event Log The diagnostic program will automatically produce a file name which includes the HPA serial number events and today s date 4 The add to database box whe...

Страница 35: ...ation The diagnostic program will automatically produce a file name that includes the HPA serial number cal tables and today s date 4 6 6 Downloading the Data Log 1 On the Diagnostic Interface program...

Страница 36: ...data select the HPA from the drop down list on the left side and then select the parameter to graph from the list on the right side There is no timescale Data points are equally spaced across the bot...

Страница 37: ...TECHNICAL NOTE OPERATION OF MT4000 TWTA 10 24 03 TN4000 3 MCL INC 37 of 46...

Страница 38: ...however no control inputs will be accepted from the membrane panel As long as the local panel microprocessor did not fail the diagnostic computer and remote interfaces will be able to provide status b...

Страница 39: ...eset Phase Voltage can be found in the MT4000 test data which was supplied with the unit The linearizer Mag control is set for the specific TWT characteristics and should not be moved from the factory...

Страница 40: ...ce J6 User interface J6 is supplied to allow various earth station equipment such as exciters to be wired into the MT4000 Refer to TN4000 2 Technical Note Installation Guide for MT4000 paragraph Conne...

Страница 41: ...NC 41 of 46 4 11 2 Procedure to Limit RF Input to the HPA 1 Rated Power No Attenuation With the HPA attenuation at minimum measure the amount of power required to drive the MT4000 system to rated powe...

Страница 42: ...igh voltage power supply will both be turned off until the RF drive level is backed down To change the Tube Overdrive Fault level from the factory set level may result in degradation or permanent dama...

Страница 43: ...ser Interface J6 and Switchover Interface J7 are not used the supplied cheater plugs should be installed on the rear panel 11 Connect the Remote Panel Computer Interface cables to the rear panel 5 2 O...

Страница 44: ...When the above check list has been completed and the caution list is reviewed the system is ready for activation To activate the system the following steps should be followed 1 Activate the HPA Main P...

Страница 45: ...r the rated output power to be expected from the amplifier system while staying within the TWT current and voltage limitations Monitor the output reflected RF power to insure that the transmission lin...

Страница 46: ...Customer Service Guide for MT4000 6 0 SHUT DOWN PROCEDURE To discontinue operation of a MT4000 TWT amplifier system the following procedure is recommended for system shutdown 1 Remove the input RF dri...

Страница 47: ...N OF MT4000 TWTA 10 24 03 TN4000 3 MCL INC A APPENDIX A 40A1546 CSP Protocol Specification APPENDIX B 40A1715 SA Bus Compatible Protocol Specification APPENDIX C 46A0204 CSP Command Set APPENDIX D 46A...

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