Modulation
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HDG3000B User manual Copyright © Qingdao Hantek Electronics Co., LTD
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8.10.4 Modulation Source
3FSK uses internal modulation source. The modulating waveform is square.
8.10.5 3FSK Rate
When internal modulation source is selected, press [Mod] > Rate softkey to set the rate
at which the output frequency shifts between "carrier frequency" and two "hopping
frequencies".
⚫ Use the numeric keypad or direction keys and knob to input the desired rate value.
⚫ The rate range is from 2mHz to 1MHz and the default is 100Hz.
8.10.6 Hopping Frequency
The range of hopping frequency depends on the carrier waveform currently selected.
Refer to "Frequency Characteristics" in Specifications.
Press [Mod] > HopFreq softkey. Use the numeric keypad or direction keys and knob to
input the desired frequency value.
8.11 4FSK Modulation
Users can configure the instrument to "shift" its output frequency between four preset
values using 4FSK modulation. The rate at which the output shifts between the four
frequencies (called the "carrier frequency" and three "hop frequencies") is determined
by the internal signal level of the instrument.
8.11.1 Select 4FSK Modulation
Press [Mod] > Type > 4FSK softkey to enable 4FSK function.
⚫ When Mod is enabled, Sweep or Burst will be disabled automatically.
⚫ After 4FSK is enabled, the instrument will generate 4FSK waveform with the
currently specified carrier and modulating waveforms. To avoid multiple waveform
changes, enable modulation after configuring the other modulation parameters.
8.11.2 Carrier Waveform Shape
4FSK carrier shape: Sine (default), Square, Ramp, Pulse, Arbitrary (except DC) or
Harmonic waveform.
⚫ Press [Wave] button on the front panel to select the desired carrier waveform.
⚫ Noise and DC could not be used as carrier waveform.
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