Model 500T8G18
Rev B
13
Color Function
International Harmonized
North American
Brown Black
Line
Blue White
Neutral
Yellow/Green Green
Safety
Ground
CAUTION:
Connect plug to J1 and secure plug with bracket only when no AC is
supplied to the cord.
3.2.6
RF Output Connections
The RF output connector is type WRD-750 waveguide.
CAUTION:
Never operate the TWTA without a matched output load rated for at least
1000 watts, continuous. The TWTA is not provided with an output
isolator. Full reflected power may irreparably damage the TWT. Even
with no drive, “looping” oscillation can result in RF output of sufficient
amplitude to damage the tube if it is operated without a load. The VSWR
detection and foldback circuits are provided to protect the tube from
progressive failure or mismatch of the output load; they should not be
relied on for protection from the absence of a load.
If an external isolator is installed at the output of the TWTA, either the isolator should have a load capable of
dissipating the full output of the TWTA or the isolator load should be provided with a temperature-sensing
switch. The temperature switch should be normally closed, self-resetting, and with a temperature rating such
that there is no possibility of damaging the load by overheating before the switch opens. The TWTA may be
interlocked with the switch by connecting it between pins 10 and 11 of the external interlock connector (J2) of
the power supply/control module. If no external isolator is used, retain the jumpers between pins 3 and 4 and
between pins 10 and 11 in the mating connector for J2 (supplied with the amplifier). See section 3.2.7,
External interlock connector, below.
If an external absorptive filter is installed at the output of the TWTA, either the absorptive filter should be
capable of dissipating the full output of the TWTA, or it should be provided with a temperature sensing
switch as described above.
3.2.7
External Interlock Connector
The power supply/control module is provided with an external interlock capability via a 15-pin female D-sub
connector, J2, on its rear panel. To enable the high voltage power supply, it is necessary to provide continuity
between J2 pins 3 and 4. If the amplifier shuts down because the interlock was opened, it will be necessary to
reset the system to return to standby (see
System shutdown screen
in Section 3.4). Users may adopt this
interlock feature to turn off the high voltage power supply, and disable the RF output, either for equipment
protection or as a backup for personnel protection from high output RF power.
Summary of Contents for 10012342
Page 2: ......
Page 4: ......
Page 8: ......
Page 12: ......
Page 20: ......
Page 44: ...Model 500T8G18 30 Rev B ...
Page 48: ...Model 500T8G18 34 Rev B ...
Page 50: ...Model 500T8G18 36 Rev B ...
Page 56: ...Model 500T8G18 42 Rev B ...
Page 70: ...Model 500T8G18 56 Rev B ...
Page 72: ......