Common Settings (Channel Quality)

The Common Settings specify the spacing and number of tones in the multitone stimulus signal.

Tone Spacing selects the tone spacing (in Hz) for the current multitone signal definition. Stimulus signal bandwidth is determined by Tone Spacing x (Number Of Tones - 1). An additional tone-spacing is required for analysis bandwidth (VSA Span).

Tone Spacing determines the length of the stimulus waveform.

Number of Tones Specifies the number of tones in the multitone signal definition. A read-only annotation next to the Number of Tones field provides feedback on the stimulus signal bandwidth (in Hz), which is determined by Tone Spacing x Number Of Tones.

Changing this value will reset the definition to default gain and phase values for all tones.

Entering an odd number of tones may place the center tone on DC. This may result in the LO feedthrough at DC affecting the results of the channel quality measurement.

Tone Spacing and span limitations

Tone Spacing is limited by PC memory (PC that is running the 89600 VSA software) and the bandwidth/capture limitations of the hardware.