Paradise 205486 REV F - Manual (Page 104)

104 208495 REV C Operations Manual, HPA2, Compact Outdoor SSPA
9.5 1:2 Fixed Phase Combined System Operation with FPRC-1200
Under normal system operation, HPA #1 and HPA #3 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 fed to the FPRC-1200 Redundant Controller.
The 1:2 Fixed Phase Combined System is controlled by an FPRC-1200 1:2 Redundancy
Controller. Detailed information on the installation and operation of the FPRC-1200 can be
found in the unit’s operations manual, Teledyne Paradise Datacom drawing #205933.
The FPRC-1200 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-1200 front panel is shown in Figure 9-11. 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.
In normal operation, HPA #2 should be selected as the standby amplifier. HPA #2 is the
middle amplifier on the amplifier frame. This allows HPA #1 and HPA #3 to be combined by
the waveguide combiner. If HPA #1 or HPA #3 were to ever fail, HPA #2 can be switched in
place of either HPA #1 or HPA #3 and the system will still maintain full output power capability
over the full operating bandwidth of the amplifier. Figure 9-12 shows the FPRC-1200 with
HPA #2 selected as the standby amplifier.
Figure 9-11: FPRC-1200 1:2 Phase Combined Redundant Controller
Figure 9-12:
HPA #1 & HPA #3 on line
with HPA #2 on standby