Analog Modulations
SMIQ
1125.5555.03
E-8
2.64
2.7.4.1
PM Deviation Limits
The maximal deviation depends on the RF frequency set (cf. Fig. 2-31). It is possible to enter a
deviation that is too high for a certain RF frequency or to vary the RF frequency to a range in which the
deviation can no longer be set. In this case the maximally possible deviation is set and an error
message displayed.
In the RF range 450 to 750 MHz and 1200 MHz to 1500 MHz a different synthesis range is selected
depending on the deviation set. If the deviation is smaller than 5 rad or 10 rad, the synthesizer is in the
normal mode with optimal spectral purity. If the deviation set is larger, the I/Q mode is automatically
selected.
20
10
5
0,3 450 750 1200 1500 3300
I/Q m ode
maximal
PM-deviation
[rad]
RF-frequency [MHz]
normal mode
Fig. 2-31
Dependency of the PM maximal deviation on the RF frequency set
