RDL RU-VCA2A, RU-VCA6A Datasheet

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RACK-UP
®
SERIES
Models RU-VCA2A & RU-VCA6A Digitally Controlled Attenuators
Pushbuttons (Internal or External) Momentary Pulses (External/Rotary Encoder) 0 to10 Vdc or 10 k Potentiometer
Selectable Power-Up Return to PRESET or LAST Level 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 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.
RDL 659 6th St. Prescott, AZ., USA 86301 (928) 443-9391 FAX (928) 443-9392 www.rdlnet.com
RACK-UP® SERIES
Models RU-VCA2A & RU-VCA6A
Digitally Controlled Attenuators
Note: The EQ RAMP controls an RDL ST-LEQ1 for automatic "loudness" adjustment. See
EXTERNAL CONTROL OPTIONS (SEE ALL RDL REMOTE CONTROL OPTIONS ON THE
RU-VCA2A AND RU-VCA6A PRODUCT PAGES OF THE RDL WEBSITE: www.rdlnet.com)
ST-LEQ1 data sheet for details.
POWER UP SETTINGS
Before applying power, set the POWER UP switches: 1 Set to LAST if the module should power-up to the last level setting; Set to PRESET if the module should power-up to the stored preset level. 2 Set to MOM (momentary) if module levels are to be adjusted using front-panel buttons or using buttons, remote controls or open­collector pulses connected to the rear-panel UP and DN terminals. 3 Set to MASTER if this module is either operating on its own or is intended to control the level of additional modules; Set to SLAVE if this module is to be controlled by another module. (Note: The SLAVE mode inactivates all front and rear panel control of the module.)
REAR PANEL layouts showing balanced and unbalanced wiring examples.
Installation/Operation
Declaration of Conformity available from rdlnet.com.
Sole EMC specifications provided on product package.
Specifications are subject to change without notice.
MASTER/SLAVE CONNECTIONS
A VCA module set as MASTER (switch 3) is able to control the level on multiple m odules. The EXTERNAL CONTROL DATA OUT jack provides data to control additional modules . Connect the OUT jack to the IN jack of the first adjacent module. Connect the OUT jack of the first adj acent module to the IN jack of the second adjacent module. Connect additional modules in the same manner. Each connected m odule must be set to SLAVE mode (switch 3) as shown.
D SERIES-RLC10K
POTENTIOMETER CONTROL
Enable potentiometer control by setting POWER UP switch 2 to 0 TO 10 VDC
TYPICAL PERFORMANCE
Inputs (2, RU-VCA2A; 6, RU-VCA6A): >10 k Balanced bridging, or Unbalanced, line level Frequency Response: 10 Hz to 50 kHz (+/- 0.5 dB) THD+N: < 0.005% (20 Hz to 20 kHz) Gain: Adjustable from unity to <–96 dB Step Size: 0.5 dB Headroom: > 18 dB (above +4 dBu) Residual Noise: < -90 dB (referred to +4 dBu at unity gain) CMRR: <-65 dB (50 to 150 Hz) Crosstalk: <-95 dB (1 k Hz, typ.); < -85 dB (20 Hz to 5 kHz); < -75 dB (5 kHz to 20 kHz) Ramp Times: 0.5 second delay; then: 3 seconds to 10 seconds (UP and DOWN times individually adjustable on front panel) Indicators (10): Front-panel LEDs indicating relative audio level (8), MAX condition (green), MIN condition (red) Audio Output (2, RU-VCA2A; 6, RU-VCA6A): 150 balanced (may be connected unbalanced) Ramp Output: 0 to 10 Vdc, (Ground-referenced) Note: Not intended to drive additional VCA 0-10V inputs EQ Ramp Output: 0 to 10 Vdc, (Ground-referenced) Note: dc taper intended only to drive RDL Loudness EQ (ST-LEQ1) Power Requirement: 24 Vdc @ 120 mA, Ground-referenced (RU-VCA2A); 24 Vdc @ 200 mA, G round-referenced (RU-VCA6A) Ambient Operating Environment: 0° C to 50° C Case Dimensions: 5.75” (14.6 cm) W x 1.65" (4.18 cm ) H x 3.54” (9.0 cm) D;3.9" (9.9 cm) D with connectors
1-TURN REMOTE CONTROL
Enable remote control by setting POWER UP switch 2 to 0 TO 10 VDC
.
EXTERNAL RAMP CONTROL
Enable external ramp control by setting POWER UP switch 2 to 0 TO 10 VDC
.
MULTIPLE REMOTE LOCATIONS
Enable pushbutton control by setting
.
POWER UP switch 2 to MOM (momentar y)
OPERATION
(Note: The Power Up CTRL switch must be set to MOM to activate the front-panel buttons.)
LEVEL ADJUSTMENT: Momentarily press the UP or DOW N button to step the level 0.5 dB. Press and hold to ramp the level up or down. RAMP TIME: Adjust the TIME controls for the desired ram p rate. (Note: TIME "-" is fastest; TIME"+" is slowest) GO TO PRESET: Press this button to return the audio level to the stored pres et value. STORE PRESET LEVEL: 1] Set the audio level to the desired volume using the front-panel (or external) UP and DOW N buttons. 2] Press and hold the GO TO PRESET button (3 seconds) until the fr ont-panel level LED flashes. OBSERVE AUDIO LEVEL: The relative audio level is displayed on the LED string display. The level is displayed in both the MOMentary and 0 to 10 VDC operating modes. (Note: The LED string display increments do not directly correspond to the LED level increments on RDL remote controls.)
Radio Design Labs Technical Support Centers
891-3455C
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
OPEN-COLLECTORS/SWITCHES
Enable momentary "pull to ground" control by setting POWER UP switch 2 to MOM
.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rule. These limits ar e designed to provide reasonable protection against harmful interfer ence in a residential installation. The equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications . However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or televis ion reception, which can be determined by turning the equipment off an on, the user is encouraged to try to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna  Increase the separation between the equipment
and receiver
Connect the equipment into an outlet on a circuit
different from that which the receiver is connected.
Consult the dealer or an experienced radio/TV
technician for help.
.