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One more press of the
soft-key will show the first list again. Select the modulation shape
required by pressing the appropriate key then press the
Done
soft-key to return to the top level
modulation menu.
All the parameters for AM are now set.
FM
To select FM press the MOD key to turn on modulation and then press the
Type
soft key to show
the display below.
The
soft-key indicates that there are too many options to show all at once so press this key to
show more. In this case there is one more list of types which will show when the
soft-key is
pressed.
One more press of the
soft-key will show the first list again.
The soft-keys present all of the modulation types which may be applied to the selected carrier
waveform. If
FM
is not already selected press the
FM
soft-key followed by the
Done
key to
return to the top level modulation menu.
To select the modulation source press the
Source
soft-key. The options are
Internal
or
External
. Internal will use the waveform specified in the shape parameter and the Graph Box
will show that shape as the modulating waveform. External will use the signal present at the MOD
IN connector and the
Freq
and
Shape
soft-keys will disappear. The Graph Box will always
show a sinewave as the modulating waveform if the source is set to External.
To set the frequency deviation press the
Deviatn
soft-key. The deviation parameter will appear
in the Edit Box and the modulating waveform in the Graph Box will show that deviation is being
edited.
