Comtech EF Data XPA-200 - Manual (Page 51)

XPA200-7984-I-OPT1, X-Band SSPA Redundant System Operation
XPA200-7984-I-OPT1, Rev.2 4-1
Section 4
Redundant System Operation
4.1 GENERAL
This option or application uses a Mitec variable phase
combiner for redundany use which is totally different than the
standard Comtech Communications redundancy operating features.
Section 2 contains the specialized redundancy system
features for this option. Also see the Mitec 2723B manual for
more detailed information.