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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.
5.6.5 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.
5.6.6 HoppingFrequency
The range of hopping frequency depends on the carrier waveform currently selected.Refer to
"Frequency Characteristics" in "Specifications".
Press[Mod]>Hoppingsoftkey. Use the numeric keypad or direction keys and knob to input the
desired frequency value.
5.7 PSK Modulation
Users can configure the instrument to "shift" its output phase between two preset values using
PSK modulation.The rate at which the output shifts between the two phases (called the "carrier
phase" and the "modulation phase") is determined by the internal signal level of the instrument or
the signal level on the [FSK/Trig/Sync/Extmod] connector on the rear panel.
5.7.1 Select PSK Modulation
Press [Mod] >Type > PSKsoftkey to enable PSK function.
When Mod is enabled, Sweep or Burst will be disabled automatically.
After PSK is enabled, the instrument will generate PSK waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
User Manual
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