The coil is transmitting signal, so I don't get why its used H-bridge...
I know H-bridge is used in motors to run the motor one way at the time.
Can you explain how it works here when its transmitting its "bits" thru the coil?
Why is the TX signal sent from both side of the coil? I though it was enough to induce the magnetic field by having on FET...
If only one side of the coil is driven, and the other side hangs on either supply rail, then the coil is supplied with pulsed DC voltage. The coil would saturate and data transmission fails.
With both sides driven you can feed DC free pulses ( positive and negative) to the coil. No saturation.