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.
FSK rate
Hop frequency
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.
66 | U2761A User’s Guide |
