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Modulation
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] >
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] >
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] >
⚫
When
⚫
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
52
HopFreq
softkey. Use the numeric keypad or direction keys and knob to
Type
>
4FSK
softkey to enable 4FSK function.
Mod
is enabled,
Sweep
or
Rate
Burst
will be disabled automatically.
Copyright © Qingdao Hantek Electronics Co., LTD
EN
softkey to set the rate
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