However, with the EDGE extension to the GSM mobile radio system, the problem of reliably monitoring the output power has been raised in a more serious form since, in this case, {HEAD ~ both the phase} and the amplitude information must be transmitted linearly by {TAIL ~ the output stage} 
However , with the EDGE extension to the GSM mobile radio system , the problem of reliably monitoring the output power has been raised in a more serious form since , in this case , { HEAD ~ both the phase } and the amplitude information must be transmitted linearly by { TAIL ~ the output stage }
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