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Chapter 3 Features and Functions
Frequency-Shift Keying (FSK) Modulation
3
FSK “Hop” Frequency
The maximum alternate (or “hop”) frequency depends on the function
selected as shown below. The default is 100 Hz for all functions.
• The internal modulating waveform is a square wave with a 50%
duty cycle.
•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.
• Front-Panel Operation: To set the “hop” frequency, press the
Hop Freq softkey. Then use the knob or numeric keypad to enter the
desired frequency.
• Remote Interface Operation:
FSKey:FREQuency {<frequency>|MINimum|MAXimum}
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): 2 mHz to 100 kHz. 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}
Function Minimum Frequency Maximum Frequency
Sine
Square
Ramp
Arbs
1 µHz
1 µHz
1 µHz
1 µHz
80 MHz
80 MHz
1 MHz
25 MHz
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