SYNTHESIZED

SIGNAL GENERATOR

6 dB

ATTENUATORI

MIXER

pg61 13d

Figure 6-60. Typical ‘l&t Setup for a Frequency Offset Measurement

Frequency Offset In-DepthDescription

The source and receiver operate at two different frequencies in frequency offset operation. The difference between the source and receiver frequencies is the Lo frequency that you specify.

The two user-defined variables in frequency offset are the receiver frequency, and the offset (LC) frequency. The source frequency is automatically set by the instment and equals receiver frequency IF + Lo or IF - Lo.

The Receiver Frequency. You can choose a CW value or start and stop values for the receiver frequency. The stimulus values, which appear on the analyzer display, will affect only the receiver.

The ORset Frequency (L0). This frequency value is the difference between the source and receiver frequencies.

Note The analyzer’s source locks to the receiver f the Lo frequency, regardless of the offset value you selected.

Once the source is phase-locked and sweeping, the analyzer’s source frequency is not known precisely. As the Lo frequency changes, the source tracks it to maintain the receiver start/stop or CW frequency that you requested.

Frequency Hierarchy. The source frequency can be greater than or less than the Lo frequency. That is, the analyzer can measure either the lower or upper of the two IF mixing products when it is in the frequency offset mode.

Frequency Ranges. Receiver frequency range: 300 kHz to 3 GHz (or 6 GHz with Option 006)

Compatible Instrument Modes and Sweep Types. Frequency offset is compatible with all sweep types in the network analyzer mode.

Application and Operation Concepts 6-121

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HP 8753E manual Typical ‘l&t Setup for a Frequency Offset Measurement