Installation
DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
2-2
TM075 – Rev. 1.3
2.2 Removal and Assembly
If using a knife or cutting blade to open the carton, exercise caution to ensure that the blade does
not extend into the carton, but only cuts the tape holding the carton closed. Carefully unpack the
unit and ensure that all of the above items are in the carton. If the Prime AC power available at
the installation site requires a different power cord/AC connector, then arrangements to receive
the proper device will be necessary before proceeding with the installation.
The DMD2401 LB/ST Unit is shipped fully assembled and does not require removal of the covers
for any purpose in installation. Should the power cable AC connector be of the wrong type for
the installation, either the cable or the power connector end should be replaced. The power
supply itself is designed for universal application using from 100 to 240 VAC, 50-60 Hz, 1.0 A.
2.3 Mounting Considerations
When mounted in an equipment rack, adequate ventilation must be provided. The ambient
temperature in the rack should preferably be between 10
°
and 35
°
C, and held constant for best
equipment operation. The air available to the rack should be clean and relatively dry. Modem
units should not be placed immediately above a high heat or EMF generator to ensure the output
signal integrity and proper receive operation.
Do not mount the DMD2401 LB/ST in an unprotected outdoor location where there is direct
contact with rain, snow, wind or sun. The modem is designed for indoor applications only. The
only tools required for rack mounting the DMD2401 LB/ST is a set of four rack mounting screws
and an appropriate screwdriver. Rack mounting brackets are an integral part of the cast front
bezel of the unit and are not removable.
J1 and J2, Tx and Rx IF connectors have voltage on the ports. Exercise
care when the DMD2401 LB/ST has power applied.
2.4 Modem Checkout
The following descriptions assume that the DMD2401 LB/ST is installed in a suitable location
with prime AC power and supporting equipment available.
2.4.1 Initial Power-Up
Before initial powerup of the DMD2401 LB/ST, it is a good idea to
disconnect the transmit output from the operating ground station
equipment. This is especially true if the current modulator configuration
settings are unknown, where incorrect settings could disrupt the existing
communications traffic. New units from the factory are normally shipped
in a default configuration which includes setting the transmit carrier off.
