An embodiment of the invention comprises a phase modulation detector comprising a pair of {HEAD ~ transformers}, {TAIL ~ each transformer} having a primary winding respectively connected to one of the transducers—e.g., via a respective input amplifier 
An embodiment of the invention comprises a phase modulation detector comprising a pair of { HEAD ~ transformers } , { TAIL ~ each transformer } having a primary winding respectively connected to one of the transducers — e.g. , via a respective input amplifier
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH