Hardkey and Softkey Reference ESG Family Signal Generators
FM
4-26 User’s Guide
FM Off On
Toggles the frequency modulation on or off for whichever FM path
configuration (
FM Path 1 or FM Path 2) you have selected. Notice, however
that although you can turn on frequency modulation with this softkey,
the RF carrier is modulated by the enabled modulation only when you
have also set
Mod On/Off to On. Whenever frequency modulation is
enabled, the
FM annunciator is turned on in the display.
There are two paths for FM modulation which can be simultaneously
enabled as long as they use different sources (Int, Ext1, or Ext2).
FM Path 2 is limited to a maximum rate of 1 MHz. FM Path 2 must be set to
a deviation less than or equal to
FM Path 1. The modulation signals from
both paths are summed internally for composite modulation.
Default Value: Off
Softkey Location:
FM/ΦM > FM Off On
FM Path 1 2
Use FM Path 1 and FM Path 2 to define two unique frequency modulation
configurations. For example, select
FM Path 1. (FM Path 1 is the default
after a normal preset. If
FM Path 1 is not highlighted, press the softkey
until the selection toggles to
FM Path 1.) Configure the modulation
characteristics (such as deviation, source, rate, and waveform) using
the remaining softkeys in the FM menu. Then enable FM by setting
FM Off On to On.
To configure a second frequency modulation configuration, toggle to
FM Path 2. Define the modulation characteristics for this second
configuration and enable FM by setting
FM Off On to On.
The RF carrier is available at the RF OUTPUT connector when you set
RF On/Off to On. Set Mod On/Off to On to modulate the RF carrier with the
modulations that you have enabled.
FM Path 1 and FM Path 2 are summed internally for composite modulation.
Either path can be switched to any one of the modulation sources: Int,
Ext1, or Ext2. All modulation types can be simultaneously enabled,
except FM with ΦM, AM with external burst source, and wideband AM
with I/Q. AM, FM, and ΦM can sum simultaneous inputs from any two
sources (Int, Ext1, and Ext2). Any given source (Int, Ext1, or Ext2) can
only be routed to one activated modulation type.
Default Value: FM Path 1
Softkey Location:
FM/ΦM > FM Path 1 2
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