Configuring the RF Signal
R&S
®
SMW200A
485User Manual 1175.6632.02 ─ 30
The "LO Coupling" settings enable you to define the coupling of the local oscillator
signal in the RF signal paths.
The related remote commands are described in Chapter 14.19.6, "SOURce:FRE-
Quency Subsystem", on page 1124.
Mode
Selects the coupling mode of the LO signals in path A and B.
If you work with a one path instrument, the distinction between A & B as well as cou-
pling are not relevant. You can select between "Internal" and "External".
See some of typical test setups in Chapter 8.6.4, "How to Configure Cascaded Instru-
ments", on page 486.
Note: Working with an external oscillator signal disables all setting parameters of "RF
Frequency / Phase / Ext. Reference" in the corresponding path.
"A&B Internal"
Uses the internal local oscillator signal in each path.
"A External & B Internal"
Uses an external signal in path A, and the internal signal of path B.
"A Internal & A -> B Coupled"
Uses the internal oscillator signal of path A in both paths.
"A External & A -> B Coupled"
Uses an external signal in both paths.
"A Internal & B RF Off"
If the selected RF frequency exceeds the maximum frequency of path
B (see the installed frequency options), this setting uses the internal
local oscillator signal of path A. In addition, it enables you to route this
LO signal to the LO OUT connector. Thus you can use it as input for
a downstream instrument.
The RF OUT of path B is switched off in this case.
"A External & B RF Off"
If the selected RF frequency exceeds the maximum frequency of path
B, this setting uses the LO input signal for path A. You can route the
signal to the LO OUT connector and use it as input for a downstream
instrument.
The RF output of path B is switched off in this case.
"A RF Off & B External"
If the selected RF frequency exceeds the maximum frequency of path
A, this setting uses the LO input signal for path B. You can route the
signal to the LO OUT connector use it as LO input for a downstream
instrument.
The RF output of path A is switched off in this case.
"Internal"
Uses the internal signal. This selection parameter applies to one path
instruments.
"External"
Uses an externally supplied signal. This selection parameter applies
to one path instruments.
Remote command:
[:SOURce<hw>]:FREQuency:LOSCillator:MODE on page 1126
Local Oscillator Coupling
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