Comtech EF Data DD2401 - Manual (Page 16)

Installation DD2401 Satellite Demodulator
2-2 MN-DD2401 - Rev. G
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 DD2401 Demodulator is shipped fully assembled. It does not require removal of the covers
for any purpose in installation. Always insure that power is removed from the DD2401 before
removing or installing a Universal Interface Module (UIM). 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 to 60 Hz, 1.0A.
2.3 Mounting Considerations
When mounted in an equipment rack, adequate ventilation must be provided. The ambient
temperature in the rack should 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. The DD2401 units
may be stacked one on top of the other up to a maximum of 10 consecutive units before providing
one RU of space for airflow. Demodulator 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 DD2401 in an unprotected outdoor location where there is direct contact with
rain, snow, wind or sun. The DD2401 is designed for indoor applications only.
The only tools required for rack mounting the DD2401 is a set of four rack mounting screws and
an appropriate screwdriver. Rack mount brackets are an integral part of the cast front bezel of
the unit and are not removable.
Shielded cables with the shield terminated to the conductive backshells are required in order to
meet EMC directives. Cables with insulation flammability ratings of 94 VO or better are required
in order to meet low voltage directives.
2.4 Demodulator Checkout
The following descriptions assume that the DD2401 is installed in a suitable location with prime
AC power and supporting equipment available.
2.4.1 Initial Power-Up
The DD2401 is shipped from the factory with preset factory defaults. Upon initial power-up, a
user check should be performed to verify the shipped demodulator configuration.
Note: Receive (Rx) Interface types are dependent upon the customer’s order.
The following are standard DD2401 Factory Configuration Settings:
Data Rate: 2,048,000 Kbps
Forward Error
Correction (FEC): 1/2 Rate Viterbi
Frequency: 950.000000 MHz (L-Band Version)
70.000000 MHz (70 MHz Version)
140.000000 MHz (140 MHz Version)