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