Wohler ATSC/DVB-3, Руководство пользователя

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ATSC/DVB-3 User Manual P/N 821507 Rev- D
Mounting
The unit should be mounted where convenient for operating persons, ideally at approximately ear level for best high frequency response. Its
superior magnetic shielding eliminates concerns about locating it adjacent to most types of CRT monitors, including even high-resolution
color monitors.
Heat Dissipation
Heat dissipated by the speaker amps is conducted directly to the left side of the chassis; no special considerations for cooling are necessary
as long as the ambient temperature inside the rack area does not exceed approximately 40°C (104°F).
Sympathetic Vibration
Sympathetic vibration from other equipment (cables, etc.,) in the rack may be serious enough to interfere with the unit’s sound quality out in
the listening area. The use of thin card stock and/or felt or foam weather-stripping type materials between adjacent vibrating surfaces, or tying
up loose cables, etc., may be required to stop vibrations external to the unit.
Mechanical Bracing
The chassis is securely attached to the front panel at eight points along its surface, not just at the four corners of the chassis ears. This feature
will reduce or eliminate rear bracing requirements in many mobile/portable applications. The weight of internal components is distributed
fairly evenly around the unit.
Audio Connections
Connection of the audio feeds is straightforward. Please refer to the system block diagram on page
18
for clarification of the general
signal paths into and out of the
ATSC/DVB-3
unit.
Inputs are via either BNC or XLR connectors. BNC inputs are 75
Ω Ω Ω Ω Ω
unbalanced; XLRs are 110
Ω Ω Ω Ω Ω
balanced. Care should be exercised to
avoid mis-matched cable types and other similar causes of undesired reflections in RF signal systems. If severe enough, such reflections
can result in corruption of the digital datastream.
AC Power
The unit's AC mains connection is via a standard IEC inlet, with safety ground connected directly to the unit's chassis. The universal AC
input (100-240VAC, 50/60Hz) switching power supply is a self-resetting sealed type, with automatic over-voltage and over-current
shutdown. There is no user-replaceable fuse in either the primary or secondary circuit.
Installation
Section 1: General Features, Specifications, and Installation