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