In operation, the variable delay element 30 provides a variable delay whose magnitude is directly related to the composite of {HEAD ~ the degrees} of {TAIL ~ operation} of the differential sections D1 and D2 
In operation , the variable delay element 30 provides a variable delay whose magnitude is directly related to the composite of { HEAD ~ the degrees } of { TAIL ~ operation } of the differential sections D1 and D2
OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH