second detector means electrically coupled to said first coil means for amplitude detecting {TAIL ~ changes} in {HEAD ~ RF signals} generated across a right sensor segment of said first coil means, and for generating a right output pulse 
second detector means electrically coupled to said first coil means for amplitude detecting { TAIL ~ changes } in { HEAD ~ RF signals } generated across a right sensor segment of said first coil means , and for generating a right output pulse
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH