Instruction manual

— —
13
unnatural proportions. The green GATE OPEN
indicator will remain continuously lighted during most
music programming, but will blink off during pauses
in speech.
AVERAGE
COMPRESSION
This is, in essence, a “drive” control at the input of the
compressor/limiter stage, affording the user control
over program density. When fully counterclockwise
(MIN) the broadcast signal will retain most of the
dynamics of the source material. As the control is
rotated clockwise, compression and limiting will
increase, reducing the program dynamic range and
effectively raising the average modulation by the dB
values shown.
A full-clockwise setting of the AVERAGE COMPRES-
SION control will be found tolerable for hard rock
music, but a setting of 6dB to 8dB may sound better
with most other “pop” program material. Classical
music will probably demand an even lower setting.
The effect of the AVERAGE COMPRESSION control is
not instantaneous. There is as much as a one-second
delay between adjusting this control and hearing any
change.
COMPRESSOR GAIN
These two LEDs display the gain state of the average
level compression circuitry. With a steady-state tone,
or with no input signal present, the compressor is in
“equilibrium” and both indicators will be lighted to
half-brightness. When the compressor is reducing
circuit gain, the red – LED will grow brighter. When
compressor gain is increasing, the green + indicator
will brighten. This pair of LEDs shows not only in
which direction compressor gain is headed, but can be
interpreted for how hard the compressor is working as
well.
PEAK LIMITING
The W.B. and the H.F. indicators display action of the
wideband and the independent high frequency limiters,
respectively. Relative limiter activity is directly
proportional to the activity of the LEDs.
FILTER COMP.
Proprietary circuitry preceding the primary low-pass
filter inhibits overshoots which would otherwise
compromise full modulation of the carrier. Action of
the overshoot compensation circuitry is displayed by
the FILTER COMP. indicator. It is normal for this LED
to flash almost continuously when “bright” music is
being broadcast.