Externally Leveling
the Swept Signal
Generator
In externally leveled op erations, the output power from the swept
signal generator is detected by an external sensor. The output of this
detector is returned to the leveling circuitry, and the output p ower
is automatically adjusted to keep p ower constant at the pointof
detection.
Leveling with
Detectors/Couplers
/Splitters
Figure 1-11 illustrates a typical setup for external leveling. When
externally leveled, the p ower level feedback is taken from the external
negative detector input rather than the internal detector. This
feedbackvoltage controls the ALC system to set the desired RF
output. Refer to Figure A-1 in Chapter 2 for a blo ck diagram of the
swept signal generator's ALC circuitry.
Figure 1-11. ALC Circuit Externally Leveled
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