Stereo Generator Connections; Comp 1 & Comp 2 (Composite Outputs 1 & 2) (Bnc); 19 Khz Out (Pilot Sync Output) (Bnc); Sca Input (Bnc) - Omnia .11 Installation And Operation Manual

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Stereo Generator Connections

Four standard female BNC connectors comprise the Omnia.11's stereo generator connections.

There are two composite MPX outputs with independent software level controls, one SCA input with level adjust

trimpot and one 19 kHz pilot sync output.

COMP 1 & COMP 2 (Composite Outputs 1 & 2) (BNC)

These two low impedance outputs (Composite 1 and Composite 2) are each capable of driving up to 100 feet of

RG-58A/U coax cable. The output levels are individually adjustable so the unit can operate as a "composite

DA" to drive a variety of equipment. The output levels and other stereo generator settings are set through

software parameters in the Stereo Generator submenu of the Input/Output menu. An internal jumper sets the

output impedance to either 5 ohms (the factory setting) or 75 ohms. The default setting is appropriate for the

vast majority of exciter connections. However, in the event that a higher source impedance is required, a jumper

can be moved (one for each composite output) on the motherboard to change the source impedance to 75 ohms.

For reference, JP10 is for Composite #1, and JP9 is for Composite #2.

This TTL-level 19 kHz square wave output can be used as the reference signal for most RDS or SCA generators

that operate at 57 kHz or other multiple of the 19 kHz pilot frequency. This Sync output is phase and frequency

locked to the stereo pilot. When this signal is used to synchronize an external SCA or RDS generator, this

locking assures that no difference frequencies exist which may cause intermodulation between the pilot and the

SCA signal.

Any SCA or RDS signal above 53 kHz can be added to the composite outputs of the Omnia.11 by connecting

the signal to the SCA INPUT connector. The SCA signal is mixed in the analog domain directly into both

composite outputs. A high-pass filter on the SCA input provides SCA to main-channel crosstalk protection. The

SCA injection level can be adjusted using the SCA IN LVL control trimpot. See below for details.

Located just above the SCA Input BNC jack is the SCA IN LVL (SCA Input Level) adjustment control.

Carefully insert a small bladed screwdriver into the hole and adjust the control if needed to set the SCA

injection level.

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