Configuring the RF Signal
R&S
®
SMBV100B
309
User Manual 1178.4460.02 ─ 03
Example: Cascading three Rohde
&
Schwarz Signal Generators
Figure 6-5: Set up of LO coupling with three Rohde
&
Schwarz Signal Generators
Generator 1 = "Internal"; "LO Out > Off"
Generator 2 = "A External & A->B Coupled"; "LO Out > On"
Generator 3 = "External"; "LO Out > Off"
A frequency of 5
GHz is assumed.
●
Signal Generator 1 is a one-path instrument, for example R&S
SMBV100B and
uses its internal oscillator signal.
●
Signal Generator 2 is a two-paths instrument, for example a R&S
SMW200A. It
receives the LO signal from the first instrument and assigns it to both paths.
●
Signal Generator 3 is a one-path instrument, for example R&S
SMBV100B,
R&S
SGT100A, or R&S
SMBV100A. It receives the LO signal from the second
instrument.
To configure the application, proceed as follows:
1. Connect the first signal generator Ref Out with LO In of the second instrument, and
similarly the LO Out of the second signal generator with LO In of the third.
2. Configure
Signal Generator 1.
Select "Freq = 5
GHz".
a) Select "RF > LO Coupling > Mode > Internal".
b) Set "Out State > On".
3. Configure
Signal Generator 2.
a) Set "Freq => 5
GHz".
b) Check if both paths are able to deal with the desired RF frequency.
● If both paths can handle the RF frequency, select "RF > LO Coupling >
Mode > A
External
&
A->B
Coupled"
● If path A is not sufficiently equipped, select "RF > LO Coupling > Mode >
A
RF
Off
&
B
External"
● If path B is not able to handle the frequency, select "RF > LO Coupling >
Mode > A
External
&
B
RF
Off"
c) Set "Out State > On".
Local Oscillator Coupling
