5-37
Hardkey and Softkey Reference
FM
FM/ΦM
This softkey toggles between the menus for FM, normal ΦM, and wideband ΦM.
Refer to the “Phase Modulation” section for a discussion of the differences
between normal
ΦM, and wideband ΦM.
Softkey Location: Press the
FM/ΦM hardkey, then press the FM/ΦM softkey.
Status after Normal Preset: FM
FM Dev
Use this softkey to set the frequency modulation deviation for the FM Path 1 and
FM Path 2 configurations. To change the value of the FM deviation, press the
softkey once. The current value for FM deviation is displayed in the active entry
area. To enter a new value, rotate the front panel knob until the desired value is
displayed, use the up and down arrow keys, or enter the value using the numeric
keypad and press the
Hz, kHz, MHz, or GHz terminator softkey. The range of values
allowed depends on the carrier frequency. The maximum peak deviation for a
frequency is calculated by multiplying N times 10 MHz. (The following table lists
the values for N and the resulting maximum peak deviations.)
For example, if you choose a carrier frequency of 400 MHz, multiply 0.5 times 10
MHz resulting in a 5 MHz maximum peak deviation.
Notice that the new value of FM deviation applies only to whichever FM path
configuration you have currently selected. Also, whenever
FM Path 1 is used with
FM Path 2, the deviation for FM Path 1 must be greater than or equal to the
deviation for
FM Path 2.
Softkey Location: Press
FM/ΦM, FM Dev
or press FM/ΦM, More 1 of 2, FM Waveform, Dual-Sine, FM Dev
Carrier Frequency N
Maximum
Peak Deviation
250 kHz to ≤ 249.999 MHz 1 10 MHz
> 249.999 MHz to ≤ 500 MHz 0.5 5 MHz
> 500 MHz to ≤ 1 GHz 1 10 MHz
> 1 GHz to ≤ 2 GHz 2 20 MHz
> 2 GHz to 4 GHz 4 40 MHz
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