R&S
®
ZVA/ZVB/ZVT Channel Menu
1145.1084.12 4.175 E-6
• The RF signal is the stimulus signal that the analyzer generates with the current channel
settings. After a reset the frequency and power of the RF signal is as defined in the Channel –
Stimulus menu. The RF signal parameters can be changed in the Set Power... and Set
Frequencies... dialogs.
•
The Local Oscillator (LO) signal is an additional RF signal that is either generated by the
network analyzer (at one the ports that are not used by the RF and IF signals) or by an external
generator.
• The IF signal is a the mixer output signal (mixing product), which is at one of the following
frequencies: IF = LO + RF or IF = |LO – RF|, i.e. LO – RF (for LO > RF) or IF = RF – LO (for RF
> LO). The IF frequency is selected in the Set Frequencies... dialog.
The signal description above with the swept RF signal and the LO signal at a fixed frequency
corresponds to the default configuration. In the Set Frequencies dialog, you can interchange the
role of the signals, selecting any of the signals as a Sweep/CW signal, a signal at Fixed
frequency or at the calculated sum or difference frequency (Auto).
The labeling of the complete diagram depends on the sweep type.
• Frequency sweep
For a frequency sweep, the signal diagram is labeled as follows:
• RF signal: Fixed port number (1), CW power, frequency sweep range.
• LO signal: Signal source (analyzer port or external generator), fixed power and
frequency.
• IF signal: Fixed port number (2), frequency range = (sweep range + LO) or |sweep
range – LO|.
• Power sweep
• For a power sweep, the signal diagram is labeled as follows:
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