A1 Card
This card defines a voltage source that is placed on a wire segment.
On the Source/Load tab, in the Sources on
geometry group, click the 
Voltage source icon. From the ドロップダウンリスト, click the 
Voltage on segment (A1) icon.
Figure 1. The A1 - Add a voltage source to a segment dialog .
Parameters:
- New source
- A new excitation is defined which replaces all previously defined excitations.
- Add to sources
- A new excitation is defined which is added to the previously defined excitations.
- Select segment
- When this item is selected, the Apply source to last segment with label field becomes active. The label of the segment to which the source must be applied is specified with this text box. If more than one segment has this label, the source is applied to the last segment with this label. Alternatively, one may select Set source position then the feed segment is determined by specifying the Cartesian coordinates in the Segment centre group. These values are in m and are scaled by the SF card if the SF card has Modify all dimension related values checked.
- Reverse feed orientation
- By default, the vector of the voltage lies in the direction from the start of the segment to its end (the direction in which it was created). When this option is checked, the vector of the voltage lies in the opposite direction. This is the direction of the current flow through the segment. The internal EMF (electromagnetic force) of the impressed voltage source is in the opposite direction.
- Apply source to last segment with label
- Label of the segment to which the source is applied. If more than one segment has the same label then source is applied to the last segment with this label.
- Magnitude of source (V)
- Magnitude of the voltage source in V.
- Phase of source (degrees)
- Phase of the voltage source in degrees.
- X, Y, Z position
- The position of the centre of the feed segment in Cartesian coordinates (only available if Set source position is selected.)
- Reference impedance (Ohm)
- 励振の基準インピーダンスは、Sパラメータの計算用に使用されると共に、得られた利得の計算に使用される基準インピーダンスです。この基準インピーダンスは、POSTFEKO内で反射係数を計算して表示するために使用されるデフォルトの基準インピーダンスでもあります。Sパラメータの計算でこの欄が空白または0の場合は、SPカードで指定された値が使用されます。得られた利得と反射係数の計算でこの欄が空白または0の場合は、50オームが想定されます。