Agilent Technologies 8753ES Option 011 Service Manual page 369

Theory of Operation
Source Theory Overview
A3 Source
This assembly includes a 3.0 to 6.8 GHz YIG oscillator and a 3.8 GHz cavity oscillator. The
outputs of these oscillators are mixed to produce the RF output signal. In Option 006
(30 kHz to 6 GHz), the frequencies 3.0 to 6.0 GHz are no longer a mixed product, but are
the direct output of the YIG oscillator. The signal tracks the stable output of the
synthesizer. The ALC (automatic leveling control) circuitry is also in the A3 assembly.
Chapter 12 12-15