Enum BDAPolarisation

Namespace

VisioForge.Core.Types.VideoCapture

Assembly

VisioForge.Core.dll

Defines the signal polarization types supported by Broadcast Driver Architecture (BDA) for satellite reception.

public enum BDAPolarisation

Fields

NotSet = -1

Indicates that the polarization has not been set.

This value is used to indicate an uninitialized state and should not be used for actual tuning operations.

NotDefined = 0

Indicates that the polarization is not defined or not applicable.

This value may be used for systems where polarization is not relevant, such as terrestrial or cable broadcasts.

LinearH = 1

Linear Horizontal polarization.

In linear horizontal polarization, the electric field oscillates horizontally (parallel to the Earth's surface). This is one of the two primary polarization modes used in satellite broadcasting.

On most LNBs, horizontal polarization is selected by applying a lower voltage (typically 13-14V) to the LNB.

LinearV = 2

Linear Vertical polarization.

In linear vertical polarization, the electric field oscillates vertically (perpendicular to the Earth's surface). This is one of the two primary polarization modes used in satellite broadcasting.

On most LNBs, vertical polarization is selected by applying a higher voltage (typically 18-19V) to the LNB.

CircularL = 3

Circular Left (Left-Hand Circular Polarization - LHCP).

In circular polarization, the electric field vector rotates in a circle. Left-hand circular polarization means the field rotates counter-clockwise when viewed in the direction of propagation.

Circular polarization is less common than linear but is used by some satellite systems, particularly in C-band and some Ku-band applications. It offers better resistance to signal degradation from atmospheric effects.

CircularR = 4

Circular Right (Right-Hand Circular Polarization - RHCP).

In circular polarization, the electric field vector rotates in a circle. Right-hand circular polarization means the field rotates clockwise when viewed in the direction of propagation.

Like LHCP, RHCP is used in specific satellite applications where resistance to rain fade and other atmospheric effects is important.

Max = 5

Maximum value marker for the enumeration.

This value is used for validation and boundary checking. It should not be used as an actual polarization setting.

Remarks

Signal polarization is a critical parameter in satellite communications. It refers to the orientation of the electromagnetic wave's electric field vector. Different polarizations allow satellite operators to transmit multiple signals on the same frequency without interference, effectively doubling the available bandwidth.

This enumeration is primarily used with DVB-S/S2 (satellite) systems. Terrestrial and cable systems typically do not use polarization as a tuning parameter.

The LNB (Low Noise Block) converter on the satellite dish uses the polarization setting to select which set of transponders to receive.