TA0321 Просмотр технического описания (PDF) - STMicroelectronics

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TA0321

Lightning protection for LNB supply and control voltage regulator

STMicroelectronics 

TA0321

2 Polarization selection

2 Polarization selection

Polarization is a way to give a specific direction to a transmission signal. It increases the beam

concentration.

The signal transmitted by satellite can be polarized in one of four different ways: Linear

(horizontal or vertical) or Circular (right-hand or left-hand).

Consequently, the satellite can broadcast both H and V or LH and RH polarized signals on one

frequency.

Figure 2. The four different ways of polarization

Linear

Horizontal

Vertical

Circular

Right hand

Left hand

11.7 GHz

12.2 GHz

Right hand circular

RHCP

12.7 GHz

Left hand circular

LHCP

Horizontal

HP

Vertical

VP

The “universal” LNB switches the polarization by looking at the voltage that it receives from the

receiver.

Generally, only two signals 13 V and 18 V are used with one type of antenna.

13 V(1) - Vertical Polarization or Circular Right-Hand Polarization (RHCP)

18 V(2) - Horizontal Polarization or Circular Left-Hand Polarization (LHCP)

Also, 1 V can be added from a receiver to any of above voltages to compensate for the voltage

drop in the coaxial cable.

1. actually from 11.5 to 14V

2. actually from 15.5 to 21V

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