RDL RACK-UP Series Installation & Operation

RACK-UP
®
Models RU-VCA2A & RU-VCA6A
Digitally Controlled Attenuators
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Local or Remote Audio Level Control
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Mono or Stereo Attenuation (RU-VCA2A)
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Six Channel / Surround Attenuation (RU-VCA6A)
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Noiseless Zero-Crossing Adjustment Steps
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96 dB Attenuation Range in 0.5 dB Steps
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Data Bus Provides Adjustment of Multiple Modules
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Multiple Remote Control Locations Possible
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Precise Level Tracking on Each Channel
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Balanced or Unbalanced Line Inputs/Outputs
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Adjustable Ramp Up/Down Rates
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Controllable Using Various RDL Remote Controls
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Selectable Level Control Options:
Pushbuttons (Internal or External)
Momentary Pulses (External/Rotary Encoder)
0 to10 Vdc or 10 k Potentiometer
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Selectable Power-Up Return to PRESET or LAST Level
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Selectable MASTER/SLAVE Mode for Control Expansion
The RU-VCA is part of the group of RACK-UP products from Radio Design Labs. RACK-UPs feature the advanced circuitry for which RDL products are known,
combined with accessible user-friendly controls and displays. The ultra compact design permits high-density installations, with three products mounted in a single rack
unit. Optional brackets permit mounting a RACK-UP module above, below, or in front of any flat surface!
APPLICATION: The RU-VCA2A is a full-featured studio-quality dual-channel audio attenuator module for local and/or remote control of
balanced or unbalanced line-level sources. The RU-VCA6A has all the features of an RU-VCA2A with four additional audio channels for
level control of surround sound (5.1) or six individual analog audio channels. Each module can be remote controlled from a single or
multiple locations. Rear-panel terminals provide flexible control options using a variety of RDL remote controls or OEM equipment.
Audio levels are controlled in 0.5 dB steps using noiseless zero-crossing digital attenuators for optimum reliability, precise tracking and
long-term click-free service. Exceptional wide-band low-noise performance makes the RU-VCA2A and RU-VCA6A suited to level
adjustment in the most demanding applications. Rear-panel inputs and outputs may each be wired balanced or unbalanced.
The RU-VCA2A and RU-VCA6A power up in one of two operating modes set by a rear-panel switch.
MOM (momentary) Mode
In the MOM (momentary) mode, audio level is controlled by momentary pushbuttons or pulses. Remote terminals and front-panel
pushbuttons are provided for up and down ramping control. If either button is held in, the audio will ramp automatically. If a button is
pulsed (< 0.5 second), the audio will increment one step. The time of both the UP and DOWN ramps is individually adjustable on the front
panel. Pushing remote UP and DOWN buttons simultaneously, or pressing the front-panel GO TO PRESET button, returns the audio to a
preset level. The preset level is stored by adjusting the desired level using the UP and DOWN buttons, then pressing and holding the
front-panel PRESET button for 3 seconds. A rear-panel switch sets the audio power-up level to either the preset level or the last level
setting used. Multiple remote control locations are possible in the MOM mode. External control pulses may be either of positive polarity or
pulled-to-ground (open-collector).
0 to 10 VDC Mode
In the 0 to 10 VDC mode the preset function is disabled and the audio level is controlled by a remote 10 k linear taper pot or by 0 to 10
Vdc. A single remote control location is possible using a remote 10 k pot.
In both operating modes, two separate 0 to 10 Vdc outputs are provided. The linear RAMP output drives the level display on RDL remote
controls; the EQ RAMP output is used to control an automatic RDL Loudness Equalizer (see ST-LEQ1). A front-panel
display indicates the relative audio level. Control expansion is possible using the EXTERNAL CONTROL DATA jacks. One module can
be set as a MASTER module to control the level of one or more additional RU-VCA2A or RU-VCA6A modules set to the SLAVE mode.
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RDL 659 6
SERIES

St. Prescott, AZ., USA 86301
 
(928) 443-9391 FAX (928) 443-9392
10-LED string
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www.rdlnet.com