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What is the difference between a short-range transmitter with an air core versus a short-range transmitter with a ferrite core?

April 26, 2017air core difference Ferrite short-range transmitter versus

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What is the difference between a short-range transmitter with an air core versus a short-range transmitter with a ferrite core?

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HARDWARE: A. The biggest difference is range. Both transmitters enable six degrees-of-freedom sensor tracking, but the ferrite version produces a stronger signal than the air core version. At 17 inches of separation, the position and angular noise for a ferrite transmitter will be about one half that of the air core. For this reason, we recommend that the air core transmitter be used in very short-range applications, such as tracking a sensor referenced to a transmitter that is no greater than 8 -12 inches away.