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66 U2761A User’s Guide
2 Features and Functions
Frequency-Shift Keying (FSK) Modulation
FSK is similar to FM except that the frequency alternates
between two preset values. You can configure the U2761A to
“shift” its output frequency between two preset values using
FSK modulation. An example of the FSK modulation
waveform is shown below. The rate at which the output
shifts between the two frequencies (called the “carrier
frequency” and the “hop frequency”) is determined by the
internal rate generator.
Figure 2-21 FSK modulation waveform
To Select FSK Modulation
The U2761A allows only one modulation mode to be enabled
at a time. The U2761A does not allow FSK to be enabled at
the same time that sweep is enabled.
FSK rate
Hop frequency