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.

Figure 8-4: FPRC-1100 Phase Combined System Controller

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.

Operations Manual, HPA2, Compact Outdoor SSPA

205486 REV F

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Paradise 205486 REV F Fixed Phase Combined System Operation with the FPRC-1100, FPRC-1100 Phase Combined System Controller
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205486 REV F specifications

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