© 2007 Wohler Technologies Inc. ALL rights reserved
6
ATSC/DVB-3/M User Manual P/N 821650 Rev-B
Installation
Mounting
NOTE: Be sure to set the Input Termination (accessed through the rear panel), BEFORE installing the unit into an enclosed rack
or console. See Item E, page 12 for setting information.
The unit should be mounted where convenient for operating persons, ideally at approximately ear level for best high frequency
response and eye level for best visual observation of the level meters. 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
Even though the unit is fairly heavy, 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 interconnect block diagram on page 19 for clarification of
the general signal paths into and out of the ATSC/DVB-3/M unit.
Digital audio inputs are via either BNC or XLR connectors. BNC inputs are 75 Ω unbalanced; XLRs are 110 Ω balanced.
Care should be exercised to avoid mismatched 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. Recommended cable types are as
follows:
Recommended cable type for analog audio signals is: Belden 9451 or equivalent.
Recommended cable type for digital audio signals is: Belden 1800B or equivalent.
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.
Section 1: General Features and Specifications
(24 pages)
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