Orban Optimod-AM 9400, Operating Manual

Page: 55 / 295

OPTIMOD-AM DIGITAL INSTALLATION
2-3
3. Set Ground Lift switch.
The G
ROUND
L
IFT
switch is located on the rear panel.
The G
ROUND
L
IFT
switch is shipped from the factory in the GROUND position, (to
connect the 9400’s circuit ground to its chassis ground). This is almost always op-
timum
.
4. Mount the 9400 in a rack.
The 9400 requires two standard rack units (3 ½ inches / 12.7 cm).
There should be a good ground connection between the rack and the 9400 chas-
sis — check this with an ohmmeter to verify that the resistance is less than 0.5

.
Mounting the unit over large heat-producing devices (such as a vacuum-tube
power amplifier) may shorten component life and is not recommended. Ambient
temperature should not exceed 45

C (113

F) when equipment is powered.
Equipment life will be extended if the unit is mounted away from sources of vi-
bration, such as large blowers and is operated as cool as possible.
5. Connect inputs and outputs.
See the hookup and grounding information on the following pages.
TOPIC PAGE
Audio Input and Audio Output Connections.............................................2-8
AES3 Digital Input and Output .................................................................2-10
Grounding ..................................................................................................2-11
6. Connect remote control interface. (optional)
For a full listing of 9400’s extensive remote control provisions, refer to Remote
Control Interface Programming on page 2-46.
Optically isolated remote control connections are terminated in a type DB-25
male connector located on the rear panel. It is wired according to Figure 2-2. To
select the desired function, apply a 5-12V AC or DC pulse between the appropri-
ate
REMOTE INTERFACE terminals. The (

) terminals can be connected together
and then connected to ground at pin 1 to create a Remote Common. A current-
l12VDC source is available on pin 25. If you use 48V, connect a 2k


10%, 2-watt carbon composition resistor in series with the Remote Common or
the (+) terminal to provide current limiting.
In a high-RF environment, these wires should be short and should be run
through foil-shielded cable, with the shield connected to CHASSIS GROUND at
both ends.