Are the drivers used for Direct Servo subs different from regular drivers?
All the drivers used in Direct Servo subs are just like any other drivers, except for the sensing coils. The gap space occupied by the sensing coil is only 6 mils. This makes it very easy to take an existing driver design, put in a sensing coil, widen the gap by 2×6=12 mils and get a driver that can be used for Direct servo subs. This change only alters the T/S parameters slightly. As a result, all Direct servo drivers can also be used in a non-servo sub. We publish their T/S parameters just in case our customers want to do so (even though practically, there is no reason to do so).
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