Analog Duplex System
Subject to Export Control, see Cover Page for details.
8-21
Modulation Generators Field Definitions
The 3900 contains three modulation generators which can be applied to the RF Generator in any
combination. Each modulation generator is independently controlled by the settings fields in this
section of the Generators Tile.
Frequency
Sets the frequency for each Modulation generator. Frequency can be specified in kHz or Hz as
defined by user.
Deviation
Defines the deviation for each generator when FM Modulation is selected. Deviation can be
specified in kHz or Hz as defined by user. This field is not available when Modulation is OFF.
Depth
Defines the depth for each generator when AM Modulation is selected. Depth is displayed as a
percentage. This field is not available when Modulation is OFF.
Waveform
Defines the Waveform for each generator.
Tick Boxes
The buttons to the left of each Modulation Generator frequency settings field allows that
generator to be turned on. Modulation can also be provided from an external source as selected
from the MIC Input or the Audio 2 connector on the RF Modulation Configuration Tile.
External Modulation
A check box to the left of the Ext (External Modulation) Source drop-down menu allows the
external source to be active.
Source
Sets the external modulation source for the Modulation Generators.
Impedance
External source can be set to un-terminated high impedance (Hi Z), or include a 600 Ω
termination (600 Ohms).
Modulation Level Warning
A warning indicator is displayed if the sum of the active modulation source levels is set to exceed
99% AM or 150 kHz FM.
AF Generator Field Definitions
Frequency
Sets the frequency for each AF generator. Frequency can be specified in kHz or Hz as defined
by user.
Amplitude
Defines the amplitude for each AF Generator. Deviation can be specified in V or mV as defined
by user.
Waveform
Defines the Waveform for each AF Generator. The selected value (Sine or Square) is displayed
on the minimized Tile beside the Amplitude
field.
Radio Buttons
The buttons to the left of each AF Generator frequency settings field turns each generator ON
when selected and OFF when un-selected.
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