Rohde & Schwarz SME02 - PM Deviation Limits

SME Analog Modulations
1038.6002.02 2.59 E-13
EXT1 COUPLING
Selection of the type of coupling AC or DC with external supply for PM1 (input
EXT1).
IEC-bus command SOUR:PM:EXT1:COUP AC
EXT2 COUPLING
Selection of the type of coupling AC or DC with external supply for PM2 (input
EXT2).
IEC-bus command SOUR:PM:EXT2:COUP AC
2.6.2.4.1 PM Deviation Limits
The maximal deviation depends on the RF frequency set (cf. Fig. 2-28). 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 93.75 MHz to 130 MHz a different synthesis range is selected depending on the
deviation set. If the deviation is smaller than 0,625 rad, the synthesizer is in the division range with
optimal spectral purity. If the deviation set is larger than 0,625 rad, the extended heterodyne band is
automatically selected.
20
10
5
2,5
1,25
0,625
0,005 93,75 130 187,5 375 750 1500 3000
extended
heterodyne band
R F
-frequency [
M H z
]
40maximal
PM-deviation
[rad]
6000
Fig. 2-28 Dependency of the PM maximal deviation on the RF frequency set