Radio Design Labs RUVCA2
Digitally Controlled Audio Attenuator

RUVCA2

The RU-VCA2 is the ideal choice in many installations where either local and/or remote audio level control is desired. Single or multiple remote control locations are possible using optional RDL RLC2 Remote Level Controls; single location remote control is possible using an RLC10K.

The RU-VCA2 rear-panel input(s) and output(s) may each be wired balanced or unbalanced. Bridging inputs allow either high or low impedance sources. The output is line-level, low-impedance balanced.

The RU-VCA2 powers up in one of two operating modes set by a rear panel jumper. In the normal mode, audio level is controlled by momentary pushbuttons. Remote pushbutton terminals and front-panel pushbuttons are provided for ramp up and ramp down operation. If either button is held in, the audio will ramp automatically. If a button is pulsed (< ½ 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 immediately returns the audio to a preset level. The preset level is set on the RU-VCA2 front panel by holding the GO TO PRESET button in while adjusting the SET LEVEL trimming potentiometer for the desired level. Multiple remote control locations are possible in the normal mode. In the alternate mode the preset function is disabled and the audio level is controlled by a remote 10 kW linear taper pot or by 0 to 10 Vdc. A single location is possible using a remote 10 kW pot. In both modes, two separate 0 to 10 Vdc outputs are provided. The RAMP output drives the level display on an RDL RLC2 Remote Control; the EQ RAMP output is used to control and RDL Loudness Equalizer (see ST-LEQ1). A front-panel, variable-intensity LED indicates the relative audio level. Two additional LEDs indicate when the RU-VCA2 audio level is off or fully on (unity gain).

Specifications:

• Input(s): 10 kOhm Bal. bridging, or Unbal.,line-level
• Frequency Response: 10 Hz to 30 kHz (+/- 0.25 dB intobridging input)
• THD+N:< 0.002% (20 Hz - 20 kHz)
• Gain: Adjustable from unity to -96 dB, then OFF(bottom step)
• Steps:
      * 1 dB (Unity to -50dB)
      * 1.5 dB (-50 to -60 dB)
      * 2.5dB (-60 to -68 dB)
      * -72 dB, -77 dB, -84 dB, -96dB, OFF
• Off Attenuation:
      * > 110 dB (1kHz)
      * > 85 dB (20 Hz - 20 kHz)
• Headroom:> 20 dB (above +4 dBu)
• Residual Noise:
      * < -95 dB (referred to +4 dBuwith level set fully ON)
      * < -100 dB(referred to +4 dBu with level set fully OFF)
• Intermodulation Distortion:< 0.002 %
• CMRR:> 65 dB ( 50 to 120 Hz)
• Crosstalk (RU-VCA2D):< -90 dB (20 Hz to 20 kHz;Right channel into Left channel, or Left channel into Right channel)
• Ramp Times: 0.5 second delay; then: 3 seconds to 10seconds (UP and DOWN times individually adjustable on front panel)
• Indicators (3):
      * Front-panel LED indicatingrelative audio level (variable intensity yellow)
      *Front-panel LED indicating fully ON condition (green)
      * Front-panel LEDindicating fully OFF condition (red)
• Front Panel Settings (3):
      * RAMP TIMEUP
      * RAMP TIME DOWN
      * PRESET level
• Audio Output(s): Balanced @ 150 Ohm to drive high orlow impedance, balanced or unbalanced line
• Ramp Output: 0 to 10 Vdc, (Ground referenced). Note:Not intended to drive additional RU-VCA2 0 - 10 V inputs
• EQ Ramp Output: 0 to 10 Vdc, (Ground referenced).Note: dc taper intended only to drive RDL Loudness EQ
• Power Requirement: 24 to 33 Vdc @ 80 mA, Ground-Referenced

Our Part #  RUVCA2