The modem provides a calibration signal for calibrating {HEAD ~ a modulation characteristic} of the supply modulator, to {TAIL ~ the supply modulator} 
The modem provides a calibration signal for calibrating { HEAD ~ a modulation characteristic } of the supply modulator , to { TAIL ~ the supply modulator }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL