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DMD50 Universal Satellite Modem
2.2
Installation Requirements
The modem is shipped fully assembled. It does not require removal of the covers for any purpose
in installation. The power supply itself is designed for universal application using from 100 to
240 VAC, 50 to 60 Hz, 1.0A.
The unit contains a Lithium Battery. DANGER OF EXPLOSION exists if the battery is
incorrectly replaced. Replace only with the same or equivalent type recommended by
the manufacturer. Dispose of used batteries in accordance with local and national
regulations.
There are no user-serviceable parts or configuration settings located inside the Chassis.
There is a potential shock hazard internally at the power supply module. DO NOT open
the Chassis under any circumstances.
Before initially applying power to the unit, it is a good idea to disconnect the transmit
output from the operating ground station equipment. This is especially true if the
current configuration settings are unknown, where incorrect settings could disrupt
CAUTION
existing communications traffic.
2.3
Installation Considerations
The can be installed within any standard 19 inch equipment cabinet or rack. The unit is a one rack
unit (RU) mounting space (1.75 inches) vertically and 19 inches of depth and requires a minimum
rack depth of 22 inches for cabling. The rear panel of the DMD50 is designed to have power enter
from the left and IF Cabling enter from the right when viewed from the rear of the unit. Data and
control cabling can enter from either side based on data interface option. The unit can be placed
on a table or suitable surface if required
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 DMD50 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 in an unprotected outdoor location where there is direct contact with rain, snow,
wind or sun. The is designed for indoor applications only.
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.
The unit CANNOT have rack slides mounted to the side of the chassis. Cooling
fans are mounted on the right-hand side of the unit.
IMPORTANT
If the unit is to be mounted in a rack, ensure that there is adequate clearance for
ventilation, particularly at the sides. In rack systems where there is high heat
dissipation, forced air cooling must be provided by top or bottom mounted fans
or blowers. Under no circumstance should the highest internal rack temperature
be allowed to exceed 50°C (122°F).
MN-DMD50 Revision 4
Installation
2–2
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