Input And Output Connections; Cable; Connectors; Analog Audio Input - Orban Optimod-FM 8300 Operating Manual

2-6
INSTALLATION

Input and Output Connections

Cable

Connectors

Analog Audio Input

We recommend using two-conductor foil-shielded cable (such as Belden 8451 or
equivalent) for the audio input and output connections because signal current flows
through the two conductors only. The shield does not carry signal and is used only
for shielding.

Input and output connectors are XLR-type connectors.
In the XLR-type connectors, pin 1 is CHASSIS GROUND, while pin 2 and
pin 3 are a balanced, floating pair. This wiring scheme is compatible with
any studio-wiring standard: If pin 2 or 3 is considered LOW, the other pin
is automatically HIGH.

Nominal input level between –14 dBu and +8 dBu will result in normal operation
of the 8300.
(0 dBu = 0.775Vrms. For this application, the dBm @600 scale on volt-
meters can be read as if it were calibrated in dBu.)

The peak input level that causes overload is +27.0 dBu.

The electronically balanced input uses an ultra low noise and distortion differen-
tial amplifier for best common mode rejection, and is compatible with most pro-
fessional and semi-professional audio equipment, balanced or unbalanced, hav-
ing a source impedance of 600 or less. The input is EMI suppressed.

Input connections are the same whether the driving source is balanced or unbal-
anced.

Connect the red (or white) wire to the pin on the XLR-type connector (#2 or #3)
that is considered H
wire to the pin on the XLR-type connector (#3 or #2) that is considered L
the standards of your organization.

In low RF fields (like a studio site not co-located with an RF transmitter), connect
the cable shield at 8300 input only—it should not be connected at the source
end. In high RF fields (like a transmitter site), also connect the shield to pin 1 of
the male XLR-type connector at the 8300 input.
by the standards of your organization. Connect the black
IGH
ORBAN MODEL 8300
by
OW