A voltage divider provides the voltages necessary to forward bias CR21, so allowing the detector to operate in the linear portion of the characteristic curve of the diode.
If the difference network in the monitor detects a difference in the two signal inputs, then the carrier output will rise to an amplitude sufficient to close gate N°1.
The shorted secondary receives an induced voltage by the action of the alternating* armature flux, and the resulting* current flowing** through the turns of the compensating* winding establishes the opposing* magnetomotive force, neutralizing*** the armature reactance.
* a direct qualifier of a substantive or noun. ** to describe an action in progress. *** in the sense of "thus" or "so" introducing a consequense.