Operations Manual, HPA2, Compact Outdoor SSPA
208495 REV B
103
10.3.1 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 10-7
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) Cable Assembly between Signal Box and Waveguide Switch Assembly
(1) FPRC-1100 1:1 Phase Combined SSPA System Controller
(2) Cable Assemblies between Signal Box and FPRC-1100
(1) RCP2-1100 1:1 Redundant Controller for BUC switch
(1) Cable Assembly between Signal Box and RCP2-1100
(2) AC line cables
(1) Quick Start RS-232 Cable for test / debug
10.3.2 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.
10.3.3 Redundant BUC Operation
With the addition of an RCP2-1100, the BUCs function as an independent, fully redundant 1:1
system that is not affected by the status of the 1:1 phase combined SSPAs.
10.3.4 Adjusting the Phase Combining
The system is phase adjusted for optimum
performance across the frequency band at the
factory, and no adjustments are typically needed
except in the event that a SSPA has been replaced.
The SSPAs are manufactured to a delay specific-
ation, but an adjustment may be necessary to
achieve the best operation in the system. After
installing the replacement amplifier, attach a power
meter or spectrum analyzer to the cross-guide
coupler at the output of the system after removing the
detector and attenuator. See
Figure 10-6
. Measure
the power output of the system. Note that this is a
–40 dBc sample.
Figure 10-6: Connect to coupler
Remove detector and
attenuator; connect to
cross-guide coupler.
