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76 205486 REV F Operations Manual, HPA2, Compact Outdoor SSPA
In this system, amplifiers 1 and 3 are normally online. The outputs of 1 and 3 are directed by
the waveguide switches into a fixed phase combiner such as a waveguide “magic tee” style
combiner. In the event of a failure of either on line amplifier, the standby amplifier, 2, can be
switched in place of either 1 or 3 and the system maintains full output power.
The 1:2 Fixed Phase Combined Amplifier System can be configured with any of the Compact
Outdoor Amplifiers listed in Appendix E in either C or Ku band. The output power of the
system is two-times the output power of the single SSPA.
System designers find that the 1:2 Fixed Phase Combined Amplifier System topology is a
very cost effective solution to realizing higher power amplifier systems. For example, it is less
expensive to configure a 1 kW C-Band redundant system using (3) 500W Compact Outdoor
Amplifiers in a 1:2 Fixed Phase Combined redundant system than it is to use (2) 1 kW
amplifiers in a traditional 1:1 Redundant System.
8.4.1 1:2 Fixed Phase Combined System Components
An outline drawing of a 1:2 Fixed Phase Combined Amplifier assembly is shown in Figure 8-
8. The system consists of:
(1) Amplifier Base Assembly, which comprises:
(1) Mounting Base (Frame or Plate)
(3) Compact Outdoor SSPAs
(1) Waveguide Switch Assembly
(1) Signal Box Assembly with Integrated Block Upconverters
(2) Cable Assemblies between SSPAs and Signal Box
(1) FPRC-1200 1:2 Phase Combined Redundant Controller
(2) Cable Assemblies between Signal Box and FPRC-1100
(3) AC line cables
(1) Quick Start RS-232 Cable for test / debug
The Amplifier Base Assembly is typically shipped intact. Verify that the hardware is securely
tightened for each Compact Outdoor amplifier and make sure to observe the amplifier’s
position indicator. If facing the RF Output end of the amplifiers, HPA 3 should be on the left
hand side, HPA 2 should be in the center, and HPA 1 should be on the right hand side as
shown in Figure 8-8.
Verify that the connections of the Waveguide Switch Assembly mate with the proper SSPA.
The FPRC-1200 controller is a 1 RU external controller specifically designed to handle such
an amplifier system. It not only handles all traditional fault monitoring and switching duties,
but also provides an overall system monitor and control facility.
8.4.2 Signal Box Assembly
The Signal Box Assembly contains the RF input isolator and three way splitter that routes the
RF to each amplifier. It also routes the monitor and control signals from each amplifier back
to the FPRC-1200 system controller.