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SatcoDX Satellite ChartColumn Explanation |
| Pol | Polarization |
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One frequency can be used twice by using two opposing polarizations, so that the two signals on the two identical frequencies do not interfere with each other. This doubles the actual number of channels that can be transmitted in the satellite's frequency range. One way of transmitting a signal is in linear polarization, the other way by rotating circular polarization. For the latter, imagine that the signal is transmitted like the thread of a screw. Therefore, there are two polarization modes: "H" = Horizontal, and "V" = Vertical, for linear polarized signals "R" = Right hand circular, and "L" = Left hand circular, for rotating/circularly polarized signals Note: Sometimes in North America the expression "reversed polarity" is in use. Often, rotating signals are used in C-Band and linear signals in Ku-Band, but there are no rules to this. Usually - but not always - the frequencies in use on the opposing polarities are separated from each other to minimize any remaining influences. | |
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