Specifications

46 209351 REV B Operations Manual, Redundant System Controllers
The LNAs or LNBs are powered by the RCP2-1200 Controller via the control cable.
Two power supplies are included in the controller for total system redundancy. The
power supplies are diode connected so that only one supply can operate the system.
The RCP2-1200 supplies +15 VDC to power the LNA / LNB and +26 VDC to operate
the transfer switches.
The RCP2-1200 will keep track of the three independent LNA/LNB systems, keeping
the link with the most failures in a given time offline. This is reset each time the user
manually overrides the system by selecting one of the units from the front panel of the
RCP2-1200.
A failure in an LNA or LNB is typically noted by a change in the DC bias current. The
RCP2-1200 has current window comparators that monitor the current drawn by each
unit and will report a fault if the current falls outside of the preset current window. The
nominal current and window width setting are factory preset to the particular LNA / LNB
system, however both are easily adjustable via the front panel control.
A typical 1:2 Redundant LNA System is shown in Figure 4-7.
LNA Plate Assembly
Control Cable, L201061
RCP2-1200
LNA 2
LNA 3
LNA 1
POL 2 INPUTPOL 1 INPUT
PARADISE
DATACOM
RCP2-1200
1:2 REDUNDANT
SYSTEM CONTROLLER
Figure 4-6: System Components, 1:2 Redundant LNA System