Lectrosonics CR187 User Manual download pdf (Page 5)

Compact Receiver

Controls and Functions

Side and Front Panels

-50 -20

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

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Lectrosonics CR187 User Manual Page 5

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