Because {HEAD ~ digital data} is modulated by {TAIL ~ a carrier} of approximately 10 MHz, an electromagnetic field is generated 
Because { HEAD ~ digital data } is modulated by { TAIL ~ a carrier } of approximately 10 MHz , an electromagnetic field is generated
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH