RDL RU-VCA2A Digitally Controlled 2-Channel Audio Attenuator RDL

The RU-ASX4DR is a four channel stereo audio selector with input gain adjustments and output level metering. The module is equipped with an internal stereo VCA for setting the output level. Source selection and level adjustment are by remote control. Each module may 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. The inputs and output are connected on rear-panel detachable terminal blocks.

Features:

• Remote Controlled Switching and Level Control
• Multiple Remote Control Locations Possible
• 4 Stereo Inputs to 1 Stereo Output
• Line-Level Audio Switching
• External Level Control Using 10k ohm Potentiometer or 0 to 10 Vdc
• 96 dB Attenuation Range in 0.5 dB Steps
• Noiseless Zero-Crossing Adjustment Steps
• Precise Level Tracking on Each Channel
• Balanced or Unbalanced Inputs and Output
• Gain Trim on Each Source
• Controllable Using Various RDL Remote Controls
• Open-Collector Output for Selected Input

The RU-VCA2A powers 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 RAMPoutput is used to control an automatic RDL Loudness Equalizer (see ST LEQ1). A front-panel 10-LED string 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.

Use the RU-VCA2A individually, or combine it with other RDL products as part of a complete system.