Lectrosonics CR187 - Manual (Page 5)

Compact Receiver
Controls and Functions
Side and Front Panels
-50 -20
RF
LECTROSONICS
CR187
MODULATION
-20
0dB OUTPUT
dBV
EXT
OFF
BATT
POWER
INT
Modulation LEDs
The Modulation LEDs indicate the audio level of the in­
coming signal. The -20 LED glows when the transmitter
modulation is at a high enough level to produce a good
audio signal-to-noise ratio. The 0 dB LED indicates the
transmitter modulation is at maximum. If both the -20
and 0 dB LEDs are glowing constant, this indicates the
transmitter’s gain is set too high. It is normal and desir­
able that you see the -20 LED glowing with an occa­
sional flicker of the 0 dB lamp in typical use.
Mini Phone Jack
The Miniphone Jack provides a audio monitor, separate
from the rear panel XLR audio output. The output level
from this jack is controlled by both the front panel OUT­
PUT control and the Headphone Level trim-pot on the
side panel. Generally, the front panel OUTPUT control
would be set to provide the proper output level at the
rear panel XLR jack, then the side panel trim-pot is ad­
justed to match the required level for your headphones.
The output at this mini connector is designed for a
medium impedance headphone/earphone. An imped­
ance between 30 and 300 Ohms will usually provide
adequate volume. The sound from a low impedance
headphone (i.e.. 8 Ohms) will not be very loud and may
be distorted at higher listening levels.
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 im­
pedance, balanced inputs. At the extreme counterclock­
wise position of the OUTPUT control, the output level
of this XLR jack will be -50 dB at full modulation. In the
fully clockwise position, the output level will be -20 dB at
full modulation.
EXT/OFF/INT Switch
The EXT/OFF/INT switch turns the receiver power off
and on and selects either internal 9 Volt battery power,
or an external 12 VDC power source (of either polarity).
FCC ID: DBZ7F7CR185
Lectrosonics, Inc.
Made in USA
S/N: XXXX
This device complies with part
15 of the FCC rules. Operation
is subject to the condition that
this device does not cause
harmful interference.
MIN MAX
Headphone Level
Power LED
The Power LED glows when adequate power is sup­
plied from either the internal battery or an external
source. 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 Power LED is connected to a precision battery test
circuit that continuously monitors battery voltage. It is at
full brightness with a new 9 VDC alkaline battery. As the
battery voltage drops during use, the LED brightness
will also decrease. After 4 to 5 hours, the battery volt­
age will be about 7 volts and the LED will be completely
extinguished. From 6.5 volts to 6 volts, the receiver will
still operate, but with degraded performance. Below
6 volts, the regulated and temperature compensated
squelch circuit will cease to be regulated.
Warning: When the battery voltage drops below
6 Volts, the power LED will remain off, but the
other three LEDs (-20 0dB and RF) 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.
RF LED
The RF LED glows when the associated transmitter is
turned on and the receiver has a good signal. When the
carrier signal from the transmitter is too weak to pro­
duce a clean audio signal, this lamp will go out as the
squelch engages and mutes the audio.
Antenna Terminal
The Antenna Terminal can be connected to any VHF
antenna with a bandwidth that covers the frequency of
the receiver and terminates with a 50 ohm BNC type
connector. A flexible whip antenna is supplied.
Headphone Level Adjustment
This recessed trim-pot on the side panel is a secondary
level control for the mini jack output on the front panel. It
does not affect the main XLR output on the rear panel.
Normally the main output level is set to match the cam­
era, mixer or recorder, which also affects the output of
the mini jack. Then the headphone level is adjusted with
this trim-pot for a comfortable listening level.
Rio Rancho, NM 5