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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 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.
• 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:
[SOURce[1|2]:]FSKey:FREQuency
{<frequency>|MINimum|MAXimum}
Function Minimum Frequency Maximum Frequency
Sine
Square
Ramp/Tri.
Pulse
PRBS
Noise BW
Arbs
1 Hz
1 Hz
1 Hz
1 Hz
1 Hz
1 mHz
1 Sa/sec
30 MHz
30 MHz
200 kHz
30 MHz
30 MHz
30 MHz
250 MSa/sec
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