Lectrosonics H187 User manual

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Guide

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Serial Number:

Purchase Date:

This guide is intended to assist with

initial setup and operation of your

Lectrosonics product.

For a detailed user manual, down‑

load the most current

version at:

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Narrowband Plug-OnTransmiter

H187

06 jun10

U.S. Patent 7,225,135

LECTROSONICS, INC.2

Controls and Functions

Power LED

Modulation LEDs Input Jack

Battery Door

AUDIO LEVEL Control

www.lectrosonics.com 3

Input Jack

Standard 3‑pin Switchcraft XLR type. The H187 is self‑locking onto a stan‑

dard microphone.

Power/Mute Switch

Turns the battery power on and off. The center position is an “audio mute”

which should be used when setting the MIC LEVEL control.

When turning the transmitter on, pause for a moment in the “mute”

position. This will prevent a turn‑on surge from occurring (a “thump”

sound).

Power LED

Indicates power status and battery strength. A weak or dim LED means that

the battery is weak, and has about an hour of operation left.

Audio Level Control

The front panel AUDIO LEVEL Control is used to adjust the incoming audio

input level for proper modulation.

Modulation LEDs

The two bicolor Modulation LEDs provide a visual indication of the input audio

signal level from the microphone.

Level LED

Flickers or glows all the time if the audio volume is adequate for normal op‑

eration.

Limit LED

Lights up when the audio volume is high, indicating that the signal level is be‑

ing limited by the compressor.

Mic Level

Used to adjust the audio input volume for the proper modulation level.

Rotate knob until the LEVEL LED ﬂickers when there is an input signal.

The LIMIT LED should light occasionally.

LECTROSONICS, INC.4

Operating Instructions

1) Insert the H187 into the selected microphone. Listen for the “click” that

indicates the H187 has locked on to the microphone. Pull on the mic to

insure proper locking has occurred.

TO AT TACH

TO REMOVE

Hold the

transmitter

case with the

microphone

pointed

upward.

Rotate the

collar in the

direction

shown.

Pull on mic to ensure it is locked.

Press firmly, listen for click.

Depress collar fully.

Click!

2) Turn the power switch to the “MUTE” position on both the transmitter and

the receiver. The “MUTE” position allows internal voltages to stabilize

before audio signal paths are opened.

3) Hold the microphone as you will when you will be using it.

4) Speak as loudly as you expect to speak in normal system use. Rotate

the MIC LEVEL knob so that the LEVEL LED ﬂickers or stays lit as you

speak. The LIMIT LED should light up on loud “peaks.” Occasional

lighting of the LIMIT LED (about 10-15% of the time) indicates proper

operation and optimum signal-to-noise ratio. Even when the transmitter

is limiting, little distortion is produced because of the high linearity of the

gain control circuit in the H187.

POWER

ON/OFF

LED

Top View

MODULATION LEDS

-10 -20

5) Move switches to “ON” position on both the transmitter and the receiver

and adjust the volume of the sound system.

NOTE: The MIC LEVEL control should not be used to control the

volume of your sound system. This is accomplished using the level

control on the receiver, or a level control on the mixing console.

www.lectrosonics.com 5

Operating Notes

If the mic level is too high — the LIMIT LED will light frequently or stay on.

This condition may cause distortion.

If the mic level is too low — neither LED will light, or the LEVEL LED will light

dimly. This condition will cause hiss and noise. You may experience severe

reduction in apparent range if the modulation level is too low. It may sound as

if you are getting dropouts. What is actually happening is that you are hitting

your noise ﬂoor because the S/N ratio has been compromised by the low

modulation.

The LEVEL LED turns on at ‑10dB below full deviation. The LIMIT LED turns

on at full deviation and indicates that the input shunt compressor is operating.

The input compressor operates over a full 35dB range regardless of the gain

control setting. The compressor uses a true absolute value circuit to detect

both positive and negative peaks. The attack time is 2 milliseconds and the

release time is 80 milliseconds. Occasional limiting is desirable, indicating

that the gain is correctly set and the transmitter is being fully modulated.

LECTROSONICS, INC.6

Battery Replacement

The H187 transmitter is powered by a standard alkaline of Li Polymer rechar‑

gable 9 Volt battery. It is important that you use ONLY these battery types for

longest life. Standard zinc‑carbon batteries marked “heavy duty” or “long‑

lasting” are not adequate. They will provide only about 4 hours of operation.

Similarly, nicad rechargeable batteries only give 4 hours of operation, and

will also run down quite abruptly. Alkaline batteries provide about 14 hours of

operation.

To open the battery compartment, press outward on the cover door in the

direction of the arrow as shown in the drawing. Only slight, sliding pressure is

needed to open and close the battery door.

Swing the door open and take note of the polarity marked inside showing the

location of the positive (+) and negative (‑) terminals. Insert the battery and

close the cover by pressing in and across, reversing the opening procedure

outlined above. Note that the battery door will NOT close if the battery is

inserted incorrectly, since the terminals will hit a protective polarity barrier.

www.lectrosonics.com 7

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