Some balanced lines use 4-conductor star quad cable to provide immunity to magnetic fields.
2.
Star quad cables often use filler elements to hold the conductor centers in a symmetric four-point arrangement about the cable axis.
3.
The increased capacitance of the star quad cable is not usually a problem with short cable runs, but it can be an issue for long cable runs.
4.
The magnetic immunity of star quad cable is a function of the accuracy of the star-quad geometry, the accuracy of the impedance balancing, and the common-mode rejection ratio of the balanced receiver.
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