Paradise 205486 REV F - Manual (Page 98)

98 208495 REV C Operations Manual, HPA2, Compact Outdoor SSPA
9.3 1:1 Fixed Phase Combined System with L-Band Input
The basic 1:1 Fixed Phase Combined system topology is very similar to a 1:1 redundant
system and is shown in Figure 9-5. When in Automatic mode, the waveguide switches (SW1
& SW2) either direct each amplifier output to the waveguide phase combiner or, if lower
output power is required, bypass the combiner and send an individual amplifier output to the
system output. The system shown in Figure 9-5 utilizes a redundant controller on the BUCs
in the signal box, along with the SSPA controller to control the phase combining.
A FPRC-1100 controller directs the HPA output switches and monitors the amplifiers. While
the system is operating in phase combined mode and an amplifier enters a fault condition, the
controller will switch the faulted amplifier offline. This provides a soft fail mode and results in a
power decrease of 3dB to the system output power.
The BUC switch (SW3) is driven by an indoor unit RCP2-1100 redundant system controller.
When a fault is detected, the switch is driven to place the faulted BUC offline without user
intervention.
This system may also be operated via manual mode. This mode of operation may offer some
benefits over automatic operation. When in manual mode, the amplifiers will not switch out of
Phase Combined Mode or switch to the operational amplifier without user intervention if an
HPA fault occurs.
However, if a BUC fault occurs, the RCP2-1100 will direct SW3 to place the operational BUC
online. A fault indicator will be present on the front panel of the RCP unit, but the system
output would be unaffected by the fault.
Figure 9-5: 1:1 Phase Combined System with HPA control of BUC redundancy
SIGNAL BOX
HPA2
HPA1