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