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1.0.
INTRODUCTION
The AGC-100 is an automatic gain control designed to maintain
average audio program levels within a reasonable range without
reducing the dynamic range to the extent that quiet passages are
no longer quiet and loud passages are no longer loud.
The AGC-100 includes a gated-gain compressor/expander which
operates in an adaptive-slope mode. With this method, the control
makes a gradual transition from a 2:1 compression ratio at low
input levels toward a constant-output at elevated input levels. A
realistic dynamic range is thus preserved while over-modulation is
avoided.
The AGC-100 may be used to process either a stereo (Left & Right)
signal, or it may be used to process two monaural inputs.
Each AGC-100 is individually enclosed in an aluminum case and
occupies 1/3 of an RM-1 or PMU401 panel mount (1-3/4" high, 19"
wide). Each AGC-100 is powered by 115 V.A.C. (Or, it may be
factory-configured for 230 V.A.C.)
CONFIGURATION
2.0
Refer to the Component Locator diagram at the rear of this manual
to identify the configuration jumper jacks, which are accessed by
removing the top cover of the AGC-100's chassis.
2.1
STEREO or DOUBLE MONO
The AGC-100 is normally shipped configured for stereo operation.
If double-mono operation is desired, one jumper must be moved
from its rear position to its front position on the circuit board. That
jumper is located approx. 5" forward of the rear panel of the
AGC-100, near the LM324 integrated circuit.
The purpose of the jumper is to couple the gain control signal
between the two channels when in the stereo mode, so that stereo
imaging remains correct. This coupling, if present with two mono
programs in the AGC-100, would be detrimental to level
optimization of the separate programs.
2.2
PRE-EMPHASIS & DE-EMPHASIS
The AGC-100 is normally shipped configured for flat frequency
response, as measured externally. However, for optimum
28 Aug 2004
AGC-100
AGC-100
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