AEA Technology, Inc. Bravo MRI II, Руководство по эксплуатации, Страница: 12 / 45

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3.9.1.1.5 R.C. Mag (Reflection Coefficient Magnitude)
This is the magnitude of the S11 vector. Minimum value is zero and implies perfect
match. Maximum value is 1.0, complete reflection of energy.
3.9.1.1.6 R.C. Angle (Reflection Coefficient Angle)
This is the same thing as the phase angle of the S11 vector. This angle contains the
information to determine cable length. Combined with the magnitude, all the impedance
information can be determined.
3.9.1.1.7 SWR
SWR is the same as voltage standing wave ratio. This can be used to roughly determine
an antenna’s match to its coax.
3.9.1.1.8 RTN Loss
The amount of transmitted energy that is reflected back, expressed in dBs.
3.9.1.1.9 No Plot (self explanatory)
3.9.1.2 S21 Operation
3.9.1.2.1 Linear Gain
The returning signal into the S21 Port is measured in relation to the signal going out on
the S11 port, expressed in linear units. i.e. a measure of 1.00 means the incoming signal is
the same as the outgoing signal amplitude. (1 mW in for every mW out).
3.9.1.2.2 S21 Angle
The phase of the returning signal is measured in relation to the phase of the outgoing
signal, expressed in degrees ( + / - 180 degrees)
3.9.1.2.3 Log Gain
The same measurement as Linear Gain, but expressed in dB’s. a logarithmic scale.
3.9.1.2.4 No Plot
3.9.2 Right Plot Data
Any data available for the left plot can be plotted on the second plot. Even the same data
can be plotted on both plots (use different scales to see both). See paragraph 3.9.1 for
detailed information on plots. The curve of the right plot is always a hashed line.