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Chapter 3 Features and Functions
Frequency-Shift Keying (FSK) Modulation
3
FSK Source
• FSK source: Internal or External. The default is Internal.
•When the Internal source is selected, the rate at which the output
frequency “shifts” between the carrier frequency and hop frequency
is determined by the FSK rate specified.
•When the External source is selected, the output frequency is
determined by the signal level on the rear-panel Trig In connector.
When a logic low level is present, the carrier frequency is output.
When a logic high level is present, the hop frequency is output.
• The maximum external FSK rate is 1 MHz.
•
Note that the connector used for externally-controlled FSK waveforms
(Trig In) is not the same connector that is used for externally-
modulated AM and FM waveforms (Modulation In). When used
for FSK, the Trig In connector does not have adjustable edge polarity.
•
Front-Panel Operation:
After enabling FSK, press the
Source
softkey.
• Remote Interface Operation:
FSKey:SOURce {INTernal|EXTernal}
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