Radio Design Labs RDL Gain Control Amplifier - Line Level (ST-GCA3)

Input:+4 dBu balanced (nominal); -45 dBu to +20 dBu for rated outputMaximum Input Level:+26 dBuOutputs (2):+4 dBu, 150 Ω balanced LINE (nominal, +0/-3 dB); -45 dBu balanced MIC into 150 ΩAGC Range: 40 dB (output level maintained within 3 dB)Frequency Response:10 Hz to 20 kHz (+/- 0.75 dB)Noise:No input signal, output un-muted:<-70 dBNo input signal, output muted:<-80 dBInput signal present, output muted:<-50 dBTHD+N:<0.3% (50 Hz to 20 kHz; Typ. 0.05% @ 1 kHz)Mute Threshold:-46 dB below max input; -28 dB below normal inputMuting Response:15 sec. for 50 dBSLOW AGC response:8 sec. for 20 dB average level adjustmentFAST AGC response:3 sec. for 20 dB average level adjustmentOn Delay:50 ms to ramp from muted to fully on conditionIndicators (2):LED, green variable intensity shows audio expansion LED, yellow variable intensity shows audio gain reductionNote: Both LEDs display equal intensity for normal input level (equal available expansion and gain reduction).Power Requirement:GROUND-REFERENCED or FLOATING, 24 to 33 Vdc @ 40 mAAmbient Operating Environment:0 C to 55 C

• APPLICATION: The ST-GCA3 is a high performance automatic gain control amplifier designed to maintain a constant average output level over a wide range of input levels
• It automatically adjusts for changes in input levels, bringing up low levels and reducing high levels
• The adjustment rate is switch-selectable to either SLOW or FAST
• The SLOW setting on the ST-GCA3 is the ideal choice anywhere slowly varying audio levels such as music need to be maintained at a constant level
• The slow gain-riding maintains the desired average operating levels without introducing any audible compression artifacts