Filter
Top Products
Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 73
8.3.1 1:1 Fixed Phase Combined System with L-Band Input Components
An outline drawing of a 1:1 Fixed Phase Combined Amplifier with L-Band Input assembly is
shown in Figure 8-6 on the following page. The system consists of:
(1) Amplifier Base Assembly, which comprises:
(1) Mounting Base (Frame or Plate)
(2) Compact Outdoor SSPAs
(1) Waveguide Switch Assembly
(1) Signal Box Assembly with 1:1 Redundant Block Up Converter System
(2) Cable Assemblies between SSPAs and Signal Box
(1) FPRC-1100 1:1 Phase Combined Redundant Controller
(2) Cable Assemblies between Signal Box and FPRC-1100
(2) AC line cables
(1) Quick Start RS-232 Cable for test / debug
8.3.2 Signal Box Assembly
The Signal Box Assembly contains the Redundant BUC Assembly including the coaxial
switch, the RF input isolator and splitter that routes the RF to each amplifier. It also routes the
monitor and control signals from each amplifier back to the FPRC-1100.
The signal box also contains a phase shifter. This phase shifter is in cascade with the RF
input to HPA 1. This allows the system to achieve optimum power combining and is factory
set for optimum combining across the full bandwidth of the amplifier. It should not normally
require adjustment in the field unless and amplifier has been replaced.
8.3.3 Redundant BUC Operation
The 1:1 Fixed Phase Combined System with L-Band Input is built utilizing a chain
redundancy architecture. This means if a Block Up Converter which is connected in series
with an SSPA fails, the SSPA will also fault. This will disable the system’s ability to phase
combine until the fault with the BUC is corrected.
Note: With the addition of an RCP2-1100, the BUCs can function as an independent, fully
redundant 1:1 system that is not affected by the 1:1 phase combined SSPA’s status.
8.3.4 Identifying a BUC Fault vs. SSPA Fault
In the event an SSPA or BUC would cause a fault, the FPRC-1100 will show this as a
summary alarm on the front panel. The BUC fault is recognized by the SSPA via the Auxiliary
Alarm input to the SSPA. The SSPA will recognize this fault as a Major Fault, and will switch
the BUC offline, along with itself.
In order to identify which device is faulted, access the system information screen on the
FPRC-1100. Scroll down until the screen displays the EXT FAULT: AUX FAULT section. If
BUC 1 is faulted, the Auxiliary Fault will display AUX11101. If BUC 2 is faulted, the Auxiliary
Fault will display AUX11110. If the Auxiliary Fault displays AUX11100 then no BUC fault is
present and the fault is with the SSPA. The faulted SSPA is identified by the red LED on the
front panel of the FPRC-1100.