5-96
Hardkey and Softkey Reference
Phase Modulation
For example, if you set up ΦMPath1 for normal phase modulation with a carrier
frequency of 400 MHz, and a rate of 100 kHz, the maximum peak deviation that
you can set is 0.5 (value of N) times 90 radians resulting in a maximum peak
deviation of 45 radians.
Notice that the new value of
ΦM deviation applies only to whichever ΦM path
configuration you have currently selected. Also,
ΦMPath2 is limited to a
maximum rate of 1 MHz. Also, whenever
ΦMPath1 is used with ΦMPath2, the
deviation for
ΦMPath1 must be greater than or equal to the deviation for
ΦMPath2.
Softkey Location: Press
FM/ΦM hardkey, toggle FM/ΦM softkey to ΦM, press
ΦMPath12
Status after Normal Preset: 0 radians
SCPI Commands:
[:SOURce]:PM[1]|2[:DEViation] <val><unit>
[:SOURce]:PM[1]|2[:DEViation]?
Table 5-1. Maximum Deviation Values for Phase Modulation
Mode Maximum Deviation
Maximum Rates (3 dB BW)
ΦMPath1 ΦMPath2
Normal
N
1
x 90 radians
100 kHz 100 kHz
High
Bandwidth
N x 2π radians 1.5 MHz (typical) 1 MHz (typical)
N x π/2 radians 6 MHz (typical) 1 MHz (typical)
1. For the value of N, refer to Table 5-2.
Table 5-2. Carrier Frequency Bands versus Value of N
Carrier Frequency N
250 kHz to ≤ 249.999 MHz 1
> 249.999 MHz to ≤500 MHz 0.5
> 500 MHz to ≤1 GHz 1
> 1 GHz to ≤2 GHz 2
> 2 GHz to 4 GHz 4
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