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12
GE N E R AL IN TERFACES
12 RB-OA3 3 Studio On-Air Switcher
Introduction
Offer LED
Dump LED
Studio 2 LED
Delay LED
Studio 3 LED
Power On Indicator
Studio 1 LED
Fig 12-1: RB-OA3 Front Panel.
The RB-OA3 is a 1U rack-mount, unity gain on-air switcher, capable of switching three stereo
pairs between three studios. Each studio can control the transmission path together with
two peripheral paths for equipment such as a codec or hybrid and there is also a last studio
to offer (LSO) bus, allowing for seamless and continuous broadcast from any multi-studio
radio network. A sustain mode allows for a sustaining system, such as a PC automation
system, to control the broadcast. Multiple RB-OA3 units can be connected together to
switch more studios or more stereo pairs.
The switching is achieved using relays, except the last studio to offer which is switched by
an analogue switch. The transmission path is switched using latching relays. This means that
if there is a power failure to the unit, the transmission path will remain selected.
All studios are connected using 25 way D-types for electronically balanced audio signals and
control is achieved using 15 way D-types, connecting to an external control unit such as the
Sonifex S2-MTBS mixer control panel or the RB-OA3R remote switcher panel.
A transmission mix connection is included to mix into the transmission path audio which is
generic to all studios. This could be used for jingles or adverts for example. The RB-OA3 also
allows for the control of a profanity delay to be shared by all connected studios.
Each studio has the ability to offer the transmission. Once offered, the transmission is fed
to the other studios via the last studio to offer bus. By adding the LSO bus as an input to
the mixer, the next scheduled station can then fade in the transmission and accept at the
appropriate time meaning the transmission can be continuous.
The sustain mode can be used to control an automated studio, such as a PC based overnight
music system which conventionally wouldn't be in its own studio and would therefore need
external control to take transmission back from it. Think of it as a studio which has no Offer
and Accept controls of its own, but which can still be put to and from transmission by the
other studios.
68
Redbox User Handbook No 3
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