Right Plot Data; Rlc Model Series/Parallel - AEA VIA Bravo MRI Operating Manual

3.9.1.2 SWR Operation
The SWR meter displays impedance in specific formats. Refer to an antenna or radio
handbook for detailed information on these quantities.
3.9.1.2.1 SWR
SWR is the same as voltage standing wave ratio. This can be used to roughly determine
an antenna's match to its coax.
3.9.1.2.2 Return Loss
The amount of transmitted energy that is reflected back, expressed in dB's.
Example! - If you are transmitting 100 Watts and have 1 Watt reflected, the 1 Watt is 20
dB less than the forward power, so the return loss is –20 dB.
3.9.1.2.3 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.
3.9.1.2.4 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.
3.9.1.2.5 Q Factor
The 2:1 SWR bandwidth is used to calculate the circuit Q. The Q is displayed
numerically when the plot has 80 points, and one of the plots displayed is SWR.

3.9.2 Right Plot Data

Any data available for the left plot can be plotted on the right 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.
3.9.3 RLC Model, Series or Parallel
The equivalent L or C (calculated from the reactance at the center frequency) can be
displayed numerically in CW mode or when using a 100 point plot. The equivalent load
appears as a resistor and a capacitor (or resistor and inductor). The values of the resistance
and reactive component can be calculated as two components in series or two components
in parallel. Selecting series or parallel determines which calculation is used when displaying
resistance or reactance. This calculation (series or parallel) affects both the numeric output
and the plots for resistance or reactance. This option has no effect on SWR plots, total Z, or
impedance angle.
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