Local Oscillator (Lo) Coupling; Phase Coherence - R&S SGT100A User Manual

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R&S SGT100A
The frequency offset value represents the frequency shift of a downstream instrument,
as for example an attenuator or an amplifier.
Enabled frequency offset does not change the frequency at the RF output (Frequency).
It influences the value of the parameter "SGMA-GUI main panel > Freq".
The following applies:
"Freq"
In the "SGMA-GUI main panel", enabled frequency offset is also indicated with the key-
word "Freq (Offs)".
Remote command:
[:SOURce]:FREQuency:OFFSet
Delta Phase
Sets the phase of the RF signal. The current phase of the signal is used as the refer-
ence. This function allows, for example, the phase of the output signal to be synchron-
ized with the phase of a signal from a second signal generator.
Remote command:
[:SOURce]:PHASe
Reset Delta Phase Display
Resets delta phase value. The set phase is adopted as the new current phase, i.e. the
delta phase value is reset to 0.
Remote command:
[:SOURce]:PHASe:REFerence

7.7.4 Local Oscillator (LO) Coupling

The LO coupling function allows you to distribute the local oscillator signal in a way that
multiple R&S SGTs or other R&S signal generators can be driven by the same LO sig-
nal. This is mandatory for phase coherent application, e.g. the generation of beam-
formed signals, and for phase coherent demodulation.
The LO coupling function is available only for instruments equipped with the option
R&S SGT-K90 (Phase Coherence). This option enables phase coherent RF outputs of
two or more RF signals. The local oscillator signal is provided at the REF/LO OUT con-
nector. An external signal can be input at the REF/LO IN connector.
7.7.4.1

Phase Coherence

Phase coherence of RF signals designates a defined, constant delta phase between
two or more RF carrier signals with the same frequency or a multiple of the frequency.
User Manual 1176.8674.02 ─ 07
= Frequency + "Offset"
on page 460
on page 341
on page 460
Signal Generator Settings
RF Settings
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