User's Manual

P.G. TM0054RB
2-2
External DC power is fed to the unit through the DIN power jack on the bottom of the
unit. Power is fed from this module to the Uplink Amp, Downlink Amp and Controller
modules. The IF conversion modules obtain their power through the Controller
module.
The interface module contains two LED indicators. The red LED indicates a PLL
unlock condition and may illuminate briefly when the unit is first switched on while the
PLLs are locking and the modules are disabled. Under normal operation, only the
green LED will be on.
Both normally open and normally closed alarm relay contact terminals are provided on
the interface module for connection to external remote monitoring equipment. An
alarm condition exists for PLL unlock condition or when unit is not powered.
Each module employs internal voltage regulators to maintain the same unit
performance over the entire power supply range of 11 to 15 VDC.
The unit may be operated from any DC supply (negative ground) in the range of 11 to
15 VDC with a current capability of 6 A. This allows for flexibility in powering the unit
from a variety of power sources which may be available at the installation site. The
unit may be powered from any of the following: a local nominal 12 VDC source, an
external AC to 12 VDC power source, or from –48 VDC site voltage by using the
correct converter. Most typical installations will use the external AC to 12 VDC power
source PS338.