HP 8753D Option 011 Service Manual page 311

Figure SIMBLK12 here.
Figure 12-1. Simplified Block iagram of the Network Analyzer System
he Built-In Synthesized Source
The analyzer's built-in synthesized source produces a swept RF signal in the range of 300 k z
to 3.0 G z. The P 8753D Option 006 is able to generate signals from 30 k z to 6 G z.
The RF output power is leveled by an internal ALC (automatic leveling control) circuit. To
achieve frequency accuracy and phase measuring capability, the analyzer is phase locked to a
highly stable crystal oscillator.
For this purpose, a portion of the transmitted signal is routed to the R channel input of the
receiver, where it is sampled by the phase detection loop and fed back to the source.
est Sets
Signal separation for the P 8753D Option 011 network analyzer can be accomplished using
any one of the following accessories:
P 85044A/B Transmission/Re ection Test Set
P 85046A/B S-Parameter Test Set
P 85047A S-Parameter Test Set
P Made Special Option Transmission/Re ection or S-Parameter Test Set
P 86205A/86207A RF Bridge
P 11667A Two-Way Power Splitter and P 86205A RF Bridge
Signal separation devices are needed to separate the incident signal from the
transmitted/re ected signal. The incident signal, which comes from the analyzer's source RF
output, is applied to the R channel receiver input. Meanwhile, the transmitted/re ected signal
is applied to the A or B channel receiver input via a test port coupler (in a test set) or an RF
bridge.
12-2 Theory of Operation
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