Amplifier Research 200T4G18, Operating And Service Manual

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Model 20T4G18
3.5 REAR PANEL FEATURES
See Figure 3-4 below
Figure 3-4. Rear Panel Features
Table 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; N female connector
7. FORWARD SAMPLE RF sample type N (female)
8. REVERSE SAMPLE RF sample type N (female) - OPTIONAL
9 RF OUTPUT RF output: TNC female connector
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 N 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. (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 output power and the RF sample port power as a function of frequency. When
only the power of the fundamental frequency is to be measured and when operating near rated power use;
filters, a frequency selective receiver, or a spectrum analyzer to reduce the harmonic content of the measured
level.
16 Rev B
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