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Chapter 3 Features and Functions
Frequency-Shift Keying (FSK) Modulation
3
FSK Rate
The FSK rate is the rate at which the output frequency “shifts” between
the carrier frequency and the hop frequency when you select the internal
FSK source.
•FSK rate (internal source): 125 Hz to 1 MHz. The default is 10 Hz.
• The FSK rate is ignored when the external FSK source is selected.
• Front-Panel Operation: To set the FSK rate, press the FSK Rate
softkey. Then use the knob or numeric keypad to enter the desired rate
.
• Remote Interface Operation:
FSKey:INTernal:RATE {<rate_in_Hz>|MINimum|MAXimum}
FSK Source
• FSK source: Internal (default) or External.
• 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 Ext Trig 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.
•
The connector used for externally-controlled FSK waveforms
(Ext Trig)
is not the same connector that is used for externally-modulated AM,
FM, PM, and PWM waveforms (Modulation In). When used for FSK,
the Ext Trig connector does not have adjustable edge polarity.
•
Front-Panel Operation:
After enabling FSK, press
Source
and choose
the desired source.
• Remote Interface Operation:
FSKey:SOURce {INTernal|EXTernal}
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