Appendix
642
Frequency-Shift Keying Modulation (FSK)
FSK is similar to FM except the frequency alternates between two preset
values. 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 or the signal level on the rear-panel Modulation
In connector. Frequency changes are instantaneous and phase-continuous.
Internal
Modulating Signal
The internal modulating signal is a square waveform with 50% duty cycle.
You can set the internal FSK rate from 1 mHz to 10 MHz. When using the
samples of the other channel as modulating signal, samples with a value
below 0 will select the carrier frequency, while samples greater than or
equal to 0 will select the hop frequency.
Frequency-Shift Keying Modulation
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