Lectrosonics CR185 - Manual (Page 4)

CONTROLS AND FUNCTIONS
RECEIVER FRONT PANEL
MODULATION LEDs
Indicate the modulation (audio level) of the incoming signal, and can be used for proper adjustment of
the transmitter’s "MIC LEVEL" or "GAIN". The -20 LED glows when the transmitter modulation is at a
high enough level to produce a good audio signal-to-noise ratio. It will normally flicker, or stay lit as
you speak into the microphone. The 0dB lamp indicates a "peak," showing that the transmitter
modulation is at maximum. Constant lighting may indicate that the audio gain in the transmitter may be
set too high. It is normal and desirable that you see an occasional flicker of the 0dB lamp in typical
use.
OUTPUT CONTROL
Attenuates the audio output level of the receiver to match the input requirements of the equipment with
which it is used. The XLR output jack on the rear panel provides an audio output at microphone level
for low impedance, balanced inputs. At the extreme counter-clockwise position of the control knob, the
output level of this XLR jack will be 50dB at full modulation. In the fully clockwise position, the output
level will be -20dB at full modulation. Intermediate settings are sometimes necessary due to the
variations in different input compressors and ALC (automatic level control) circuits on various VCR’s
and audio inputs. The markings around the control knob are provided simply as "memory markers;"
they are not calibrated with reference to a specific output level.
EXT/OFF/INT SWITCH
Turns the receiver power off and on and selects either internal 9 Volt battery power, or external 12 Volt
DC power (of either polarity).
POWER LED
Glows when the power switch is in the proper position and the battery is good, or when external 12 Volt
DC power is properly supplied. If this LED is very dim or does not light up when the switch is turned
on, replace the battery or check the connections from the external power source. The LED glows
brightly to indicate a good battery and dims as the battery voltage decreases.
The POWER LED is connected to a precision battery test circuit that continuously monitors battery
voltage. The LED is at full brightness with a new 9 volt alkaline battery. As the battery voltage drops
during use, the LED brightness will also decrease. After 4 to 5 hours, the battery voltage will be about
7 volts. The LED will be completely extinguished.
IMPORTANT!
When the battery voltage drops below 6 Volts, the power LED will remain off, but the other 3
LEDs will light up and a loud rush of audio noise will be heard as the squelch opens. This
condition is normal, and is easily remedied by replacing the battery.
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