In standard vector error-correction, a
thru
(delay = 0) is used as a calibration standard. The
solution to this problem is to use a calibration mixer with very small group delay as the
calibration standard.
An important characteristic to remember when selecting a calibration mixer is that the delay
of
the
device should be kept as low as possible.
‘Ib
do this, select a mixer with very wide
bandwidth (wider bandwidth results in smaller delay).
6-166 Applicationmd
OperationConcepts