The signal profile 38, which is shown as a dashed line, relates to the situation where {HEAD ~ the amplitudes} of {TAIL ~ the in phase signal} 16 and of the quadrature signal 17 are constant—this is the situation corresponding to the prior art 
The signal profile 38 , which is shown as a dashed line , relates to the situation where { HEAD ~ the amplitudes } of { TAIL ~ the in phase signal } 16 and of the quadrature signal 17 are constant — this is the situation corresponding to the prior art
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL 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