MCL MT4000 TWTA Bedienungsanleitung
TN4000-3
Technical Note
Operation of MT4000 TWTA
October 24, 2003
Mark Schmeichel 10/24/03
Engineering Date
TECHNICAL NOTE – OPERATION OF MT4000 TWTA 10/24/03
TN4000-3 MCL, INC. 2 of 46
TABLE OF CONTENTS
1.0 SAFETY SUMMARY.......................................................................................................4
1.1 Definitions of Warnings, Cautions, and Notes...........................................................4
1.2 General Safety Precautions......................................................................................... 5
1.3 List Of Hazards .......................................................................................................... 6
2.0 SCOPE................................................................................................................................8
3.0 CONTROLS & INDICATORS ....................................................................................... 8
3.1 Discrete Controls & Indicators...................................................................................9
3.2 Front Panel Display & Screen Content ....................................................................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 Interface Override............................................................................38
4.8 Optional Linearizer...................................................................................................39
4.9 Switchover Interface J7 and Front Panel Controls...................................................39
4.10 User Interface J6....................................................................................................... 40
4.11 Prevention of Excessive RF Input Power.................................................................40
5.0 INITIAL TURN ON OF THE HPA ..............................................................................42
5.1 Initial Turn-On Check List....................................................................................... 42
5.2 Operating Caution List............................................................................................. 43
5.3 Power-Up Procedure ................................................................................................44
6.0 SHUT DOWN PROCEDURE........................................................................................46
TECHNICAL NOTE – OPERATION OF MT4000 TWTA 10/24/03
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LIST OF APPENDICES
Appendix A- - 40A1546 CSP Protocol Specification
Appendix B - 40A1715 SA Bus Compatible Protocol Specification
Appendix C - 46A0204 CSP Command Set
Appendix D - 46A0203 SA Bus Command Set
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1.0 SAFETY SUMMARY
1.1 Definitions of Warnings, Cautions, and Notes
WARNING AND CAUTION statements have been strategically placed in the text to emphasize
certain steps or procedures for the protection of personnel (WARNING) or equipment
(CAUTION). A WARNING or CAUTION once provided would apply each time the related step
is repeated, regardless of the number of times 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 maintenance procedure, practice, condition, statement, etc., which
if not strictly observed, could result in injury to or death of personnel.
An operating or maintenance procedure, practice, condition, statement, etc., which if
not strictly observed, could result in damage to or destruction of equipment, or loss of
mission effectiveness.
NOTE
An essential operating or maintenance procedure, condition,
or statement which must be highlighted.
CAUTION
WARNING
TECHNICAL NOTE – OPERATION OF MT4000 TWTA 10/24/03
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1.2 General Safety Precautions
The following are general safety precautions and instructions that personnel must understand and
apply during many phases of operation and maintenance to ensure personnel safety and health
and the protection of property. Portions of this information may be repeated in certain chapters
of this publication for emphasis.
KEEP AWAY FROM LIVE CIRCUITS
Operating personnel must at all times observe safety regulations. Do not replace components or
make adjustments inside the equipment with the voltage 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 from, discharge, and
ground a circuit before touching it. Adhere to all lock out/tag out requirements.
DO NOT SERVICE OR ADJUST ALONE
Do not attempt internal service or adjustment unless another person capable of rendering aid and
resuscitation is present.
RESUSCITATION
Personnel working with or near dangerous voltage shall be trained in modern methods of
resuscitation.
COMPRESSED AIR
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.
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1.3 List Of Hazards
The operation of this amplifier may involve some of the following hazards; any of them could
result in serious harm to personnel if proper safety precautions are not taken.
HIGH VOLTAGE
Lethal Voltages up to 15,000 Volts are present in this amplifier when it is
operating. USE EXTREME CAUTION when 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 possibly resulting in
blindness and death. Cardiac pacemakers may be affected. Always terminate both
the RF input and RF output, even during tests, which involve no RF drive, to avoid
the RF hazard should the TWTA oscillate.
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.
WARNING
WARNING
WARNING
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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
TECHNICAL NOTE – OPERATION OF MT4000 TWTA 10/24/03
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2.0 SCOPE
This document and its appendices will described the controls, operator interfaces, and operating
procedures for a MT4000 TWTA. This manual assumes a familiarity and working experience
with high power microwave RF amplifiers.
The MCL MT4000 is designed for long and reliable life under a variety of environmental
conditions. All components utilized in this system are conservatively rated 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 & INDICATORS
Complete operational control and status is available at the local control display panel, remote
panel, or computer interface. However, due to safety concerns certain controls will only be
available on the Local panel.
The user at the TWTA front panel will be provided system status and diagnostics through a four
line vacuum fluorescent display (VFD), membrane panel CCA LED s, membrane panel CCA
buttons, and a digital encoder used to adjust the amplifier parameters.
TECHNICAL NOTE – OPERATION OF MT4000 TWTA 10/24/03
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3.1 Discrete Controls & Indicators
The indicators & controls described in this section are provided on the HPA front panel. Further
description of these functions follows in later sections of this document.
3.1.1 Filament Off Button/LED
When this button is activated, from any state except Transmit, the Filament Power Supply will be
turned off. When illuminated this Yellow LED will indicate that the HPA is in the Filament Off
state.
3.1.2 Delay LED
Yellow LED which when illuminated will indicate the HPA is going through a filament warm up
cycle and is not yet in Standby.
3.1.3 Standby Button/LED
There are two functions for this button. First, if pressed while the HPA is in the Filament Off
state filament delay will be initiated, the Yellow LED in the button will be flashing. Second, if
pressed while the 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 button is activated the HPA will cycle into the HV on state.
When the Green LED inside the button is continuously illuminated, the HPA is in transmit. If
flashing, transmit has been selected, but the amplifier is still in filament delay, and upon
completion of filament delay the HPA will go into Transmit.
3.1.5 Summary Alarm LED
Yellow LED when illuminated the HPA has an alarm state that can lead to a fault condition if it
is not corrected.
3.1.6 Reset Button & Summary Fault LED
When this button is activated the a fault reset will be initiated. When the Red LED inside the
button is illuminated, the HPA has a fault and the high voltage is turned off.
3.1.7 RF On Button/LED
When this button is activated the SSA RF switch will be put into the ON state if no other
interface is causing a RF Off state. When the Green LED inside the button is illuminated, the
SSA RF switch is enabled.
TECHNICAL NOTE – OPERATION OF MT4000 TWTA 10/24/03
TN4000-3 MCL, INC. 10 of 46
3.1.8 RF Off Button/LED
When this button is activated the HPA will disable the SSA RF switch. When the Yellow LED
inside the button is illuminated, the SSA RF switch is disabled.
3.1.9 Computer Rx LED
The Yellow LED will illuminate with data received from the computer port.
3.1.10 Computer Tx LED
The Green LED will illuminate with data transmitted to the computer port.
3.1.11 Remote Rx LED
The Yellow LED will illuminate with data received from the remote port.
3.1.12 Remote Tx LED
The Green LED will illuminate with 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 when the detected forward power is lower than the user
specified level.
3.1.15 Local Button/LED
When this button is activated the HPA will allow the operator at the front panel to control the
HPA operating configuration. When the Green LED inside the button is illuminated, the
amplifier is controlled from the HPA front panel.
3.1.16 Computer Button/LED
When this button is activated the HPA will allow the device on the computer interface to control
the HPA operating configuration. When the Yellow LED inside the button is illuminated, the
amplifier is controlled via the computer serial port.
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