MCL TN440-3, Technical Note

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TECHNICAL NOTE – OPERATION OF MT4400 TWTA 08/10/2004
TN4400-3 MCL, INC. 8 of 36
2.0 SCOPE
This document and its appendices will describe the controls, operator interfaces, and operating
procedures for a 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. 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 remote panel and/or computer
interface. There is a limited amount of controls locally; however, due to safety concerns these
controls will only be available when activated.
3.1 Discrete Status
On the MT4400 HPA there is a tri-color LED that provides the current mode/state of operation
of the HPA. These modes are the following:
STATE FAULT ALARM RED ON GREEN ON YELLOW ON
FALSE TRUE OR FALSE FALSE FALSE TRUE=100ms
FALSE=900ms
Filament Off
TRUE TRUE OR FALSE TRUE FALSE FALSE
FALSE TRUE OR FALSE FALSE FALSE TRUE=1S
FALSE=1S
Delay
TRUE TRUE OR FALSE TRUE FALSE FALSE
FALSE TRUE OR FALSE FALSE TRUE FALSE Xmt
FALSE TRUE FALSE FALSE=100ms
TRUE=900ms
TRUE=100ms
FALSE=900ms
FALSE TRUE OR FALSE FALSE FALSE TRUE Stby
TRUE TRUE OR FALSE TRUE FALSE FALSE
Xmt Selected FALSE TRUE OR FALSE FALSE TRUE=1S
TRUE=1S FALSE
* Alarms do not change LED states unless noted.
** Timings are approximate.
Table 1 – Current Mode/State of Operation for the HPA