Signal Hound VSG25, Руководство пользователя программного обеспечения

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Getting Started |
Modulation Controls
5
Multi-Tone Controls
•
Tone Spacing – Specify the spacing in kHz between each output tone.
•
Tone Count – Specify the number of generated output tones.
•
Notch Width – Specify a bandwidth of a notch reject filter to be applied to the resulting
output tones.
• Tone Phase – Specify how the phase of each individual tone is generated.
ASK/FSK Controls
• Symbol Rate - Specify the symbol rate of the resulting data signal in kHz.
•
Modulation Type – Specify whether to generate an ASK or FSK signal.
• Modulation Depth – For ASK signals this is defined as (V
max
– V
min
) / (V
max
+ V
min
) . For FSK
signals this is defined as peak deviation (F
max
– F
min
) / 2.
•
Filter Type – Specify whether a Gaussian filter is applied to the resulting modulation
waveform.
•
Filter Alpha – Specify the roll-off factor of the Gaussian filter. This is disregarded if no filter
is selected.
•
Data – Specify a data sequence to be modulated by bringing up the symbol editor. See the
Symbol Editor section.
PSK/QAM Controls
• Symbol Rate – Specify the symbol rate of the resulting data signal in kHz.
•
Modulation – Specify the modulation of the output signal. The data specified will be
encoded using the selected modulation.
•
Filter – Specify which inter-symbol interference filter is to be applied to the resulting
modulation waveform.
• Filter Alpha – Specify the roll-off factor. If no filter is selected this value is ignored.
•
Data – Specify a data sequence to be modulated by bring up the symbol editor. See the
Symbol Editor section.
Ramp Sweep Controls
• Span – Specify the frequency span in MHz for the device to sweep.
•
Sweep Time – Specify in milliseconds how fast the device should sweep the selected span.
Step Sweep Controls
•
Start – Specify in MHz the start frequency of the stepped sweep signal.
• Stop – Specify the stop frequency of the stepped sweep signal. Combined with the start
frequency, these two values define the range of the stepped sweep.
• Step – Specify the step size in MHz of the stepped sweep. The signal starting at the
specified start frequency will be stepped in increments of the step frequency until the
frequency is greater than the stop frequency, at which point the process will repeat.