Lectrosonics WM Quick Start Guide

Quick
Start
Guide

Watertight Transmitter

WM

Fill in for your records:

Serial Number:

Purchase Date:

U.S. Patent 7,225,135

This guide is intended to assist with
initial setup and operation of your
Lectrosonics product.

For a detailed user manual, down­load the most current
version at:

www.lectrosonics.com/manuals

6 July 2012

Controls and Functions

Modulation

Audio

Input Jack

PWR LED

LCD Screen

The display is a highly visible backlit LCD with screens for making all setup and level
adjustments. The transmitter can be powered up with or without the RF output turned
on. With the RF output turned off, all adjustments can be made without creating interfer­ence for other wireless systems in the vicinity.

For normal powering up and down, a countdown appears in the LCD. The buttons must
be held in for the duration of the countdown, which helps to prevent accidentally turning
the transmitter on or off.

LEDs

AUDIO Button

Power LED

The PWR LED glows green when the battery is good. The color changes to red when
there is about 30 minutes of operation left with the recommended lithium battery. An
alkaline battery will have about 20 minutes of life left. When the LED begins to blink red,
there are only a few minutes of life.

Note: A NiMH rechargeable battery will give little or no warning when it is depleted. If you wish to use
NiMH batteries, we recommend trying fully charged batteries in the unit and using the battery timer feature
available in most receivers to determine the available operating time.

A weak battery will sometimes cause the PWR LED to glow green immediately after
the unit is turned on, but will soon discharge to the point where the LED will turn red or
the unit will turn off completely. When the transmitter is in SLEEP mode, the LED blinks

green every few seconds.Audio Input Jack this is a threaded locking connector

that accepts the Lectrosonics watertight WP connector.

UP Arrow

LCD

FREQ Button

Battery Compartment

Caps

DOWN

Arrow

Battery Compartments and Thumb Screws

The large knurled thumbscrews retain the batteries and maintain solid battery contact.
The lanyard keeps the battery caps attached, but it can be removed if desired using a
1/16 inch hex key (Allen wrench).

Modulation LEDs

Proper input gain adjustment is critical to ensure the best audio quality. Two red/green
LEDs will glow to accurately indicate modulation levels. The input circuitry includes a
wide range DSP-controlled limiter to prevent distortion during high peak levels.

It is important to set the gain (audio level) high enough to achieve full modulation during
louder peaks in the audio. The DSP-controlled limiter can handle peaks over 30 dB
above full modulation. Full modulation is indicated when the -20 LED first turns red.
With an optimum setting, the -20 LED will flicker red during operation. If the LEDs never

flash red, the gain is too low.

LECTROSONICS, INC.2

Signal Level -20 LED -10 LED

Less than -20 dB Off Off

-20 dB to -10 dB

-10 dB to +0 dB

+0 dB to +10 dB

Greater than +10 db

Red Red

Green Off

Green Green

Red Green

AUDIO Button

The AUDIO button is used to display the gain and low frequency roll-off settings. The
UP and DOWN arrows adjust the values. This button is also used with the FREQ button
to enter standby mode and to power the transmitter on or off.

FREQ Button

The FREQ button displays the selected operating frequency and also toggles the LCD
between displaying the actual operating frequency in MHz and a two-digit hexadecimal
number that corresponds to the equivalent Lectrosonics Frequency Switch Setting.
This button is also used with the AUDIO button to enter standby mode and to power the
transmitter on or off.

Up/Down Arrows

The Up and Down arrow buttons are used to select the values on the various setup
screens and to lock out the control panel. Pressing both arrows simultaneously enters
the lock countdown. When an attempt is made to change a setting while the control
panel is locked, a message will flash on the LCD as a reminder that the unit is locked.
Once locked, the buttons can only be unlocked by removing the battery, or with the RM
remote control.

Antenna

The fixed whip antenna is made of a flexible, woven, galvanized steel mesh cable.

Preventing Corrosion

Whenever the transmitter has been exposed to moisture or perspiration, follow the
instructions below to minimize the risk of corrosion.

DRY THE UNIT BEFORE REMOVING THE MICROPHONE CONNECTOR OR BATTERY CAPS.

If the transmitter has been exposed to salt water, rinse it with fresh water and then dry it
thoroughly with a clean paper towel or cloth.

Dry the exterior of the transmitter with a clean paper towel or cloth. Remove all moisture
around the battery caps and microphone cable connector.

After removing the battery caps and microphone connector, wipe off any residual mois­ture around the battery compartment and microphone jack openings and on the battery
caps and microphone connector.

®

The O-rings should be coated with Vaseline
each use to ensure the seals are watertight.

DO NOT USE ANYTHING OTHER THAN PURE PETROLEUM JELLY TO LUBRICATE THE O-RINGS.

Silicon-based lubricants will dissolve the O-rings.

Store the unit with no batteries installed, battery caps removed and the microphone
disconnected. This will allow any buildup of humidity and moisture to evaporate.

*Vaseline is a registered trademark of Conopco, Inc

www.lectrosonics.com 3

or an equivalent petroleum jelly* before