To Select Modulating Waveform Source
Press Mod Source to select “Int” or “Ext” modulating waveform source.
1. Internal Source
When internal source is selected, the modulating waveform is set as a Square with
50% duty cycle, and the “shift” frequency at which the output frequency shifts
between “carrier frequency” and “modulation frequency” is determined by “FSK
Rate”.
2. External Source
When external source is selected, the generator accepts the external modulating
signal from the [ExtTrig] connector (as shown in the picture bellow) at the rear
panel.
Notice that, the [ExtTrig] connector used to control FSK modulation externally is
different from the [ModIn] connector used to control AM/FM/PM modulation
externally. In FSK modulation, [ExtTrig] has an adjustable edge polarity.
To Set FSK Rate
When internal source is selected, press FSK Rate to set the “shift” frequency at which
the output frequency shifts between “carrier frequency” and “hop frequency”.
Input the desired rate value using numeric keyboard or knob.
The available rate ranges from 2 mHz to 1 MHz, and the default value is 100 Hz.
Notice that, this menu will be grayed out and disabled when “external” source is
selected.
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