AR 10010475, Operating And Service Manual

Page: 36 / 70

40T18G26A
3.5 REAR PANEL FEATURES
S ee Figure 3-4 below.
Figure 3-4. TWTA Rear Panel
Table 3-2. TWTA Rear Panel Features
Item Title Function
1. AC POWER IN AC power input connector: IEC-320 connector
2. IEEE-488 Remote control connector: 24-pin hermaphrodite
3. EXTERNAL INTERLOCK
Connector to remote temperature switch protecting the isolator load:
D-sub 15-pin female
4. — Cooling air intake
5. — Cooling air outlet
6. RF INPUT RF input; Type K female connector
7. FWD SAMPLE RF forward power sample: Type K female connector
8. RF OUTPUT RF output: Type WR-42 waveguide
9. REV SAMPLE RF reverse power sample: Type K female connector - OPTIONAL
3.6 INITIAL TURN-ON AND WARM-UP PROCEDURE
Install the TWTA as discussed in section 3.2. Provide an RF generator to the RF input Type K connector
A1J1. Set RF generator level below -50 dBm and set desired frequency in specified range. Connect a load
suitable for 100 watts continuous operation to the output waveguide. The load VSWR should be less than
2.0:1. A power meter and suitable attenuators may be connected to the RF sample port A1J2 or optional
reverse power sample port. (Refer to RF sample port calibration factors on the rear of the unit or on the
Info
screen in MENU 2). These show the relation between the amplifier forward / reverse power and the RF
sample port forward / reverse power as a function of frequency.
Set the Keylock Switch to LOCAL.
Switch on the MAIN POWER circuit breaker. The fan will operate. The front panel display will show
several identification messages and then the MENU 1 screen. The third line will indicate that the heater time
delay is active.
Allow the heater warm-up delay to expire. Line three will indicate OFF/READY.
16 Rev C