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ACPAutomatic Cross Pol, pronounced as 3 separate letters. Pol is short for polarization. Our transmit and receive signals are horizontally or vertically polarized. If the angle ("skew") of the dish is less than optimal relative to the polarization, the signal will be degraded, and there can also be interference when the frequency is used for other purposes on the opposite polarization.
Prior to the availability of computers to perform the check of cross-pol isolation it required an engineer at the other end, analyzing the signal with instruments as the dish was adjusted. Now, the tests are completely automated.
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