Orban OPTIMOD-FM 8600, Operating Manual

Page: 67 / 397

OPTIMOD-FM DIGITAL INSTALLATION
2-7
site), also connect the shield to pin 1 of the male XLR-type connector at the 8600
input.
•
If the output of the driving unit is unbalanced and does not have separate
CHASSIS GROUND and (–) (or LOW) output terminals, connect both the shield
and the black wire to the common (–) or ground terminal of the driving unit.
Analog Audio Output
•
Electronically balanced and floating outputs simulate a true transformer output.
The source impedance is 50
Ω
. The output can drive loads of 600
Ω
or higher; the
Analog
O
UT
L
EVEL
control adjusts the 100% modulation level over a –6 dBu to
+24 dBu range. The outputs are EMI suppressed.
•
If an unbalanced output is required (to drive unbalanced inputs of other equip-
ment), take it between pin 2 and pin 3 of the XLR-type connector. Connect the
LOW pin of the XLR-type connector (#3 or #2, depending on your organization’s
standards) to circuit ground and take the HIGH output from the remaining pin.
No special precautions are required even though one side of the output is
grounded.
•
Use two-conductor foil-shielded cable (Belden 8451, or equivalent).
•
At the 8600’s output (and at the output of other equipment in the system), do
not connect the cable’s shield to the CHASSIS GROUND terminal (pin 1) on the
XLR-type connector. Instead, connect the shield to the input destination. Con-
nect the red (or white) wire to the pin on the XLR-type connector (#2 or #3) that
is considered HIGH by the standards of your organization. Connect the black
wire to the pin on the XLR-type connector (#3 or #2) that is considered LOW by
the standards of your organization.
AES3 Digital Input and Output
In a standard 8600, there are two digital inputs and two digital outputs. One input
accepts program audio; the other accepts AES11 house sync, although sync is not re-
quired. Either output can be programmed to emit the signal intended for the ana-
log FM channel and/or the signal intended for the digital channel.
If you intend to use the BS.1770 Safety Limiter to drive a digital radio chain, we sug-
gest that you use Digital Output 1 to drive the digital radio transmitter. The BS.1770
safety limiter in the analog processing chain is calibrated with reference to 100%
modulation (see page 1-25) and is usable with the analog, digital, and composite
outputs.
The program input and output are both equipped with sample rate converters and
can operate at 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz.