User Manual 51
Different carrier waveforms have different frequency ranges as shown in the table below. For all
the carrier waveforms, the default value is 1KHz.
5.10.4 Modulating Waveform Source
3FSK uses internal modulation source. The modulation waveform is square.
5.10.5 3FSK Rate
3FSK uses internal modulation source. The 3FSK Rate is the rate at which the output frequency
shifts between "carrier frequency" and two "modulating frequencies". Press Rate to set.
Use the numeric keyboard or direction keys and knob to input the desired frequency value.
The frequency range is from 2mHz to 1MHz and the default is 100Hz.
5.10.6 Hopping Frequency
Alternating frequency (hopping frequency) is the modulating frequency. The range of hop
frequency depends on the carrier waveform currently selected.
Sine: 1μHz to 200MHz
Square: 1μHz to 50MHz
Ramp: 1μHz to 5MHz
Arb: 1μHz to 50MHz
Press HopFreq1/HopFreq2 to set the parameter. Use the numeric keyboard or direction keys and
knob to input the desired frequency value.
5.11 4FSK Modulation
You 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 or the signal level on the front-panel [Sync/Mod/Trig] connector.
5.11.1 Select 4FSK Modulation
Press Mod->Type->4FSK to enable this function.
When Mod is enabled, Sweep or Burst will be disabled automatically.
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