Orban Optimod-FM 8300 Operating Manual page 51

OPTIMOD-FM DIGITAL
If you need to change the plug to meet your country's standard and you
are qualified to do so, see Figure 2-1. Otherwise, purchase a new mains
cord with the correct line plug attached.
3. Set Ground Lift switch.
The G
L
ROUND IFT
The G
L
ROUND
connect the 8300's circuit ground to its chassis ground). If you are using the
8300's composite output to drive an exciter with an unbalanced output, set the
switch to L .
IFT
This will break most potential ground loops. If you have an installation that does
not respond to use of the G
loop by using Orban's CIT25 Composite Isolation Transformer. If the CIT25 is in
use, the G
ROUND
4. Mount the 8300 in a rack.
The 8300 requires two standard rack units (3 ½ inches / 12.7 cm).
There should be a good ground connection between the rack and the 8300 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
Audio Input and Audio Output Connections.............................................2-6
AES3 Digital Input and Output ...................................................................2-7
Composite Output and Subcarrier Inputs ..................................................2-8
Grounding ..................................................................................................2-10
6. Connect remote control interface. (optional)
For a full listing of 8300's extensive remote control provisions, refer to Remote
Control Interface Programming on page 2-36.
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-
limited +12VDC source is available on pin 25. If you use 48V, connect a 2k
switch is located on the rear panel.
switch is shipped from the factory in the GROUND position, (to
IFT
ROUND
switch will usually be set to GROUND.
L
IFT
switch, you can always break a ground
L
IFT
INSTALLATION
PAGE
2-3