Modulation
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Copyright © Qingdao Hantek Electronics Co., LTD HDG3000B User manual
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8.11.3 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.
8.11.4 Modulation Source
4FSK uses internal modulation source. The modulating waveform is square.
8.11.5 4FSK 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 three "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.
8.11.6 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.
8.12 OSK Modulation
When OSK (Oscillation Shift Keying) modulation is selected, users can configure the
generator to output a sine signal with intermittent oscillation as shown in the figure
below (the carrier waveform is 100Hz and the OSK rate is 1kHz). The start-oscillation
and stop-oscillation of the internal crystal oscillator are controlled by the internal signal
level or signal level from the [FSK/Trig/Sync/Extmod] connector on the rear panel.
When the internal crystal oscillator starts to oscillate, the instrument starts to output the
carrier waveform and when the internal crystal stops oscillating, the output stops.
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