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Chapter 4 Remote Interface Reference
Frequency-Shift Keying (FSK) Commands
4
FSK Commands
FSKey:SOURce {INTernal|EXTernal}
FSKey:SOURce?
Select an internal or external FSK source. The default is INT.
The :SOUR? query returns “INT” or “EXT”.
•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 (FSK:INT:RATE command).
•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, FM, PM, and PWM waveforms (Modulation In).
When used for FSK, the Trig In connector does not have adjustable
edge polarity and is not affected by the TRIG:SLOP command.
Use the APPLy command or the equivalent FUNC, FREQ, VOLT, and
VOLT:OFFS commands to configure the carrier waveform.
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