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Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 63
A special case of the 1:2 Redundant System exists when an external reference is
required of the system. With an external 10 MHz reference input on each polarity input
to the system, the standby amplifier will not receive a reference signal and therefore
would be in a faulted condition. In this state, the redundant controller will not allow the
standby amplifier to come on line if a failure occurs with amplifier 1 or amplifier 3. See
Figure 7-25.
RF OUT-POL
2
RF OUT-POL 1
Amp 1
Amp 2
Amp 3
RCP2-1200
Redundant Controller
BUC
L Band Input- POL 1
L Band Input- POL 2
BUC
BUC
Alarm
Inputs
Switch Drive
10MHz
10MHz
No path for 10MHz to
the Standby BUC
Figure 7-25: 1:2 Redundant System with External Reference showing the
absence of 10 MHz reference to the stand-by BUC