Importance

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Abstract

An unbounded marker for a swept-tuned analyzer is adjusted by an operator. The frequency of the unbounded marker can be controlled by the operator in three ways, namely, by turning a knob, by pressing UP and DOWN step keys, or by entering a frequency for the unbounded marker using a numeric key pad. The knob continuously adjusts the tune frequency of the analyzer when the unbounded marker reaches the upper or lower boundary of the frequency span. At the high end of the frequency span, the knob continuously re-tunes the start and stop frequencies higher in frequency. At the low end of the frequency span, the knob continuously re-tunes the start and stop frequencies lower in frequency. The unbounded marker remains at the edge of the trace. At the boundaries of the frequency span, the UP and DOWN step keys re-tune the analyzer by a step, the size of which is equal to the frequency span, and the unbounded marker is positioned at the edge of the trace. When the analyzer is fixed tuned to a given frequency, i.e., the frequency span is zero, the step preferably equals 50% of the IF bandwidth. Finally, when the numeric key pad is used to set the unbounded marker frequency and the frequency is outside the current frequency span, the analyzer is re-tuned so that the center of the frequency span is equal to the entered frequency, and the marker is positioned at the entered frequency.

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First Claim