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LibreVNA manual - frequeny to frequency

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Documentation/UserManual/manual.tex
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@ -1448,7 +1448,7 @@ This section is about calibrating the source output level and spectrum analyzer
Both the internal signal source and the receiver paths used in the signal generator or spectrum analyzer modes have no means of ensuring accurate amplitudes (as imperfections are removed by the VNA calibration, the hardware is not optimized for absolute amplitude accuracy). Frequency dependent amplitude calibrations are available in order to improve the accuracy of both the signal generator and the spectrum analyzer (especially when the tracking generator option is enabled in the spectrum analyzer). These calibrations are permanently stored in the device and are only required to be performed once. The \textbf{Source Calibration} corrects the output of the signal generator and the spectrum analyzer's tracking generator, while the \textbf{Receiver Calibration} corrects the measurement of the spectrum analyzer.
For both calibrations, other test equipment is required, ideally covering the whole range of \SI{1}{\mega\hertz} to \SI{6}{\giga\hertz} (a calibration of only the partial frequeny range is also possible but signals/measurements outside the calibrated range will be inaccurate). The Soure Calibration requires a way to measure the output of the \vna{} (e.g. a spectrum analyzer or power meter), the Receiver Calibration requires a signal source (e.g. a signal generator). Once either calibration has been completed, the \vna{} can also infer the other one with reasonable accuracy.
For both calibrations, other test equipment is required, ideally covering the whole range of \SI{1}{\mega\hertz} to \SI{6}{\giga\hertz} (a calibration of only the partial frequency range is also possible but signals/measurements outside the calibrated range will be inaccurate). The Soure Calibration requires a way to measure the output of the \vna{} (e.g. a spectrum analyzer or power meter), the Receiver Calibration requires a signal source (e.g. a signal generator). Once either calibration has been completed, the \vna{} can also infer the other one with reasonable accuracy.
\subsection{Source Calibration}
Select \menu[,]{Device,Source Calibration}. A window showing the current source calibration opens: