Frequency-Shift Keying (FSK) Modulation
l 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 is present, the carrier frequency is output. With a logic high, the hop frequency is
output.
FSK Rate
FSKey:INTernal:RATE {<rate_in_Hz>|MIN|MAX}
The FSK rate is the rate at which the output frequency "shifts" between the carrier frequency and the hop frequency
using the internal FSK source.
l FSK rate (internal source): 125 µHz to 1 MHz, default 10 Hz.
l The FSK rate is ignored when the external FSK source is selected.
FSK Source
FSKey:SOURce {INTernal|EXTernal}
May be Internal (default) or External.
l 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.
l 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 is present, the carrier frequency is output. With a logic high, the hop frequency is
output.
l 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 con-
nector does not have adjustable edge polarity.
82 Agilent 33500 Series Operating and Service Guide
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