What is CPI Test VSAT?
What is CPI Test VSAT?
VSAT Link Commissioning The satellite operator will normally require you to rotate the RF feed horn to achieve at least 30dB of isolation during the commissioning process, this test is called CPI (Cross Polarisation Isolation).
What is cross pol and Co pol?
Co-polar means when the polarization of both the transmitting (test antenna) and receiving antenna (reference horn antenna) is the same and cross polarization means when the polarization of both the antennas are different.
What is cross polarization isolation?
Cross-polarization isolation is the ratio of the cross-polarized signal component from one transmitted polarization to the copolarized signal component for the orthogonal transmitted polarization. The two signal components that determine cross-polarization isolation are received on the same polarization.
How does cross polarization work?
Cross-Polarization Photography is the method of taking two linear polarizers – a polarizing film at the light source and a polarizing filter at the lens – and rotating both polarizers opposite each other to further dim light or cause what is known aslight extinction.
How do mirrors affect polarization?
The mirror preserves the polarization state of pure S- or P-polarized incident light upon reflection, but mixed states, such as linear, circular, or elliptical polarization states are altered, so that for example a circularly polarized beam may become elliptically polarized after reflection.
What is polarization in LNB?
Vertical polarisation is produced by the open end of a rectangular waveguide whose narrow dimension is vertical and whose broad face is horizontal. To set nominal Vertical receive polarisation the broad faces of the LNB waveguide must be on top and underneath.
What is the difference between cross polarization discrimination and polarization isolation?
At any point along a path, the ratio of the cross-polarized signal component to the copolarized signal component is defined as depolarization or as cross-polarization discrimination. However, cross-polarization isolation is the quantity that limits the performance of dual-polarized communication systems.
Can a mirror be polarized?
Most of the light around us, such as light from the sun and lightbulbs, is unpolarized but can become polarized by passing through a polarization filter. …
Does polarization change after reflection?
The only effect reflection from a mirror will have on polarization is the angular change fron incident to reflective light. The actual polarization, or lack of it, will not be changed.
