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Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 71
8.2 1:1 Fixed Phase Combined System Operation with the FPRC-1100
Under normal system operation, both HPA 1 and HPA 2 are on-line. Their output power is
combined at the magic-tee waveguide combiner. The waveguide combiner has an integral
RF sampler that provides a sample of the RF output sample at -40 dBc. This port feeds an RF
attenuator/diode detector combination. The detector’s output voltage is sent back to the
Signal box via a coaxial cable and linked to the FPRC-1100 Redundant Controller.
The FPRC-1100 is a 1 RU high indoor controller that can remotely monitor and control the 1:1
Fixed Phase Combined system. The controller has a very user friendly interface that allows
the operator to monitor the composite output power of the system and adjust the gain of the
amplifiers in 0.1 dB increments over a 20 dB range. The controller adjusts each amplifier in
the system and keeps the amplitude of each balanced for optimal power combining.
The FPRC-1100 can be used in automatic or manual mode. In manual mode if a fault occurs
in one of the amplifiers, a fault will be indicated on the front panel but no waveguide switch
change will occur. In automatic mode the controller will determine the appropriate waveguide
switch positions and switch the remaining two amplifiers on line. This will ensure that the
system is operating at full output power capability.
The FPRC-1100 front panel is shown in Figure 8-4. In most cases the user will place the
controller in Auto mode so that the controller can determine the proper switch position in the
event of an amplifier failure. The mimic display shows the position of each waveguide switch
by lighting an LED in the waveguide switch path.
Detailed information on the installation and operation of the FPRC-1100 can be found in the
unit’s operations manual, Paradise Datacom drawing #205933.
Figure 8-4: FPRC-1100 Phase Combined System Controller