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1. Select the Modulating Waveform
Press Waveform, and rotate the multifunction knob to select the desired
modulating waveform, and then press down the knob to select it. You can also
press Waveform continuously or enable the touch screen to select it. The available
modulating waveforms include sine, square, triangle waveform, and noise.
2. Set the Modulation Frequency
Press Frequency, then rotate the multifunction knob or use the pop-up
numeric keypad to set the frequency of the modulation signal. The available range
is from 1 Hz to 50 kHz.
3. Set the Frequency Deviation
Press Deviation, then rotate the multifunction knob or use the numeric keypad
to set the frequency deviation of modulating waveform from the carrier frequency.
The settable frequency range is from 1 Hz to to the current frequency of the carrier
waveform.
21.3.3 FSK
FSK (Frequency-shift Keying) is a modulation method that uses the digital signal to
control the carrier frequency changes. It is one of the methods that have been early
used in information transmission. Its advantages lie in good performance in anti-
noise and anti-attenuation, and it has been widely used in in low and medium rate of
data transmission.
1. Set the Modulation Polarity
Press Polarity continuously to select "Positive" or "Negative" of the modulating
waveform to control the frequency output.
2. Set the Modulating Rate
Press FSK Rate, then rotate the multifunction knob or use the pop-up numeric
keypad to set the frequency of the modulation signal. The available range is from 1
Hz to 50 kHz.
3. Set the Hopping Frequency
Hopping frequency indicates the frequency of the modulating waveform. The
range of the hopping frequency is from 100 mHz to the maximum frequency of
the carrier waveform. By default, it is 10 kHz. Press Hop Freq, then rotate the
multifunction knob or use the pop-up numeric keypad to set the hopping
frequency.
Function/Arbitrary Waveform Generator (Option)
318
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