CenterFrequency/Span

Operation

Center frequency/span is another way of establishing swept

operation. This is just a different way of defining sweep limits. As an example of center frequency/span operation:

Press m(7J IGHz).

Press ISPAN) (iJ (GHz).

The synthesizer is now sweeping from 3.5 to 4.5 GHz (to view these figures, press either (START) or (STOP), then m). The data display area indicates the center frequency, as well as, the span. Notice that the green SWEEP LED is on.

While span is the active function, try the rotary knob and arrow keys. This symmetrical increase or decrease of the frequency span about the center frequency is one reason that center frequency/span swept operation is used instead of start/stop frequency sweep.

Another example illustrates the subtleties of center frequency/span.

Press (?ZFiK) @ LGHz)

Press 1SPAjj) @ (GHz)

Notice that the center frequency changed. This is because the center frequency could not accommodate a span of 8 GHz without exceeding the lower frequency limit of the synthesizer’s specified frequency range. If the low or high frequency range limits are exceeded, the inactive (center or span) function is reset. Experiment with the rotary knob and the arrow keys as alternate methods of data entry.

1-6 Getting Started Basic