Modulation EN ⚫ Press [Wave] button on the front panel to select the desired carrier waveform. ⚫ Noise and DC could not be used as carrier waveform. 8.6.3 Carrier Waveform Frequency For different carrier waveforms, the settable range of carrier frequency is different. please refer to "Frequency Characteristics" in Specifications. The default value is 1kHz. Press [Setting] > Frequency softkey on the front panel, and then use the numeric keypad or direction keys and knob to input the desired frequency value. 8.6.4 Modulation Source Press [Mod] > SignalSrc softkey to select Internal (default) or External as the modulation source.
internal Source When internal modulation source is selected, the modulating waveform is set as a Square with 50% duty cycle, and the rate at which the output frequency "shifts" between "carrier frequency" and "modulating frequency" is determined by "FSK Rate". external Source When external modulation source is selected, the generator receives the external modulating signal from the [FSK/Trig/Sync/Extmod] connector on the rear panel. Note: The [FSK/Trig/Sync/Extmod] connector is different when controlling FSK and AM/FM/PM modulations externally.
8.6.5 FSK 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 "hopping frequency". ⚫ 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. Note: This menu will be grayed out and disabled when the external modulation source is selected. HDG3000B User manual Copyright © Qingdao Hantek Electronics Co., LTD 46