© 2003 Wohler Technologies Inc. ALL rights reserved
12
ATSC/DVB-3/SDI User Manual P/N 821557 Rev-A
10
17
Section 2: Operation
Front Panel Features
Power Indication LED
This LED signals the operating condition of the power supply. The LED glows GREEN to indicate the unit is connected to
mains power and an operation voltage is present.
Phase Indication LEDs
These three LEDs offer instant verification of phase (polarity) conditions in the pair of channels selected for monitoring in the
left
and
right
channel speakers. There are three LEDs; two smaller LEDs (labeled
IN
and
OUT)
on either side of a larger LED
(labeled
AVG)
. The small
IN
and
OUT
LEDs show instantaneous phase relationships in the signal, while the larger
AVG
LED
indicates the
average
phase condition. The small
IN
LED on the
left
glows (or blinks) GREEN when signals are
in-phase
.
The small
OUT
LED on the
right
glows (or blinks) AMBER for
out-of-phase
signals. The large
AVG
LED indicates the
average
phase condition by glowing GREEN for
in-phase
conditions, or RED for
out-of-phase
conditions. In general, it is
sufficient to regard the
AVG
LED (
average
phase condition) as adequate for proper phase monitoring. While it is normal for
stereo signals to contain some intermittant instanateous out-of-phase and in-phase conditions (small LEDs), a steady RED glow
of the larger LED almost always indicates an out-of-phase alarm condition.
SDI Signal Status Indication LED
This LED will indicate the status of any SDI signal entering
Source 2
regardless of any monitor selection settings. This LED
shows the following conditions:
• OFF:
No valid SDI signal present.
• GREEN:
Valid SDI signal is present.
• RED:
SDI signal not properly received.
Headphone Jack
Select the headphone audio sources as you would for the internal speakers. When you plug in headphones, the speakers will
mute. This jack accepts a standard 1/4” phone type stereo plug.
Input Status Indication LEDs (AC-3 and PCM)
These two green LEDs indicate which kind of signal is being received at the
Source 1
inputs. When an
AC-3
signal is being
monitored from
Source 1
inputs, the
left
AC-3
LED will glow GREEN. When a
PCM
or standard
AES/EBU
signal is being
monitored from the
Source 1
inputs, the
right
PCM
LED will glow GREEN.
Pro-16 Selection Switch anf Indication LED
In the event that you are processing two different
Dolby Digital Pro-16
data streams it is possible to select between the two
with this toggle switch. The LED will glow AMBER if such signals are present. In the absence of such data streams, the LED
will
not
be lit and the switch will be nonfunctional.
Balance Control Pot
This control pans the volume balance between the
left
and
right
speakers.
SDI Subgroup Select Switch (1 or 2)
This 2-position toggle switch allows the operator to choose whether the unit will monitor
Subgroup
1
or
Subgroup
2
of the
chosen
SDI Group
(
1
,
2
,
3
, or
4
) as selected by the
SDI Group Select Switch
(
Item 8
, page 10).
Subgroup
selection
chooses the channels to be monitored from the selected
SDI Group
as follows:
Subgroup 1
= Channels 1 and 2
Subgroup 2
= Channels 3 and 4
Note that the
Input Source Select Switch
(
Item 6
) must be set to
2-SDI
in order for the selected SDI signals to be actively
monitored.
(Continued)
16
15
14
11
12
13
