OPTIMOD-FM INSTALLATION
2-7
Two Composite Baseband Outputs are provided, each with independent output level
control. The second composite output can be reconfigured in software as a Pilot Refer-
ence Output useful for RDS (RBDS) subcarrier generators that require an external sync
reference. Each output uses a BNC connector.
Two SCA Inputs are provided for stations that use additional subcarriers (SCAs). Each
input uses a BNC connector.
Audio Input and Output Connections
Cable
We recommend using two-conductor foil-shielded cable (such as Belden 8451 or equiva-
lent), because signal current flows through the two conductors only. The shield does not
carry signal, and is used only for shielding.
Connectors
• 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.
Analog Audio Input
• Nominal input level between –14 dBu and +8 dBu will result in normal operation of
the 8400.
(0 dBu = 0.775Vrms. For this application, the dBm @600Ω scale on voltme-
ters can be read as if it were calibrated in dBu.)
• The peak input level that causes overload is dependent on the setting of the Analog
Input
Clip Level control. It is adjustable from 0 dBu to +27.0 dBu.
• The electronically balanced input uses an ultra low noise and distortion differential
amplifier for best common mode rejection. It is compatible with most professional
and semi-professional audio equipment, balanced or unbalanced, having a source im-
pedance of 600Ω or less. The input is EMI suppressed.
• Input connections are the same whether the driving source is balanced or unbalanced.
• Connect 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 stan-
dards of your organization.
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