Modulation EN 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. HDG3000B User manual Copyright © Qingdao Hantek Electronics Co., LTD 52