Lectrosonics M175 Manuel utilisateur

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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

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www.lectrosonics.com/manuals

Belt Pack Transmitter

M175

06 jun10

U.S. Patent 7,225,135

LECTROSONICS, INC.2

Controls and Functions

Mic Jack

Supplies “phantom power” for electret microphones and headset models.

The microphone cord serves as the antenna for the transmitter.

Power ON/OFF

The switch should be left in the OFF position when the transmitter is not in use or

the battery will drain, even when not in use

Battery Indicator Lamp

Will light when the transmitter is turned on and will stay lit as long as the bat-

tery is good. As the battery voltage drops, the lamp will dim and ﬁnally go out.

Mic Level Adjust

Used to match the gain of the transmitter to different microphones, individual

voices or other audio inputs.

Audio Switch

The AUDIO SWITCH (M175-LS only) is a toggle type on-off switch used to

shut off the audio signal without shutting off the RF carrier of the transmitter.

Note: The M175DC, Digital Code Squelch version is operationally

identical to the standard M175.

Battery Instructions

The M175 Series transmitter uses a

9 Volt lithium or alkaline battery. A

lithium battery will provide the best

performance with over 30 hours of

operation. An alkaline battery will

provide up to 15 hours of operation,

and carbon zinc batteries will only

provide about 4 hours of operation.

To replace the battery, open the bot-

tom battery door cover with your thumb, rotate the door until it is perpendicu-

lar with the case and allow the battery to fall out of the compartment into your

hand. Observe the large and small holes in the battery contact pad before

inserting a new battery. You will feel the door snap into place when it is fully

closed.

www.lectrosonics.com 3

Operating Instructions

Adjustments to the transmitter must be made before the wireless microphone

system is placed into operation. The procedures are listed in the order in

which they should be performed:

1) Turn the wireless receiver on and make any required preliminary adjust-

ments in accordance with instructions in the receiver operating instruc-

tions.

2) Plug the microphone into the transmitter. Rotate the plug clockwise to

make sure the connection is locked.

3) Turn the transmitter power on and verify that the red lamp on it lights. If

the lamp is very dim or does not light, replace the battery.

4) Observe that the RF lamp on the receiver control panel is lit. This veriﬁes

that the receiver is receiving a usable radio signal from the transmitter.

5) Position the microphone in the location it will be used during actual opera-

tion. If a headset microphone is being used, adjust the headband for a

comfortable ﬁt to the left side of your head. Position the microphone ele-

ment at the corner of the mouth and rotate the white volume control fully

clockwise. Do not position the microphone pickup directly in front of your

mouth as this may cause unwanted noise from breath pops as you speak.

6) Adjust the audio gain of the transmitter to match your microphone and

your voice with the supplied screwdriver. The adjustment is made while

observing the modulation level lamps on the receiver control panel:

a) Speak at the voice level you will be using during actual operation.

b) While speaking, adjust the transmitter gain until the green modulation

lamp on the receiver (may be marked “-20”) is lit or ﬂickers and the red

modulation lamp blinks only on the loudest words. Raise and lower your

voice while observing the lamps. The red lamp should blink occasionally.

Note: The modulation lamps on some receivers may be marked or

colored differently than just described. Consult the operating manual

for the receiver in use.

7) You may now adjust the receiver output level to the desired audio output

level. Consult your receiver manual if you are not sure of the location of

these controls.

The GAIN ADJUST is used only to adjust for proper modulation level lamp

indications. DO NOT use it to adjust the audio output level of the receiver.

Different voices and different microphones will usually require readjustment

of the transmitter gain control, so check the adjustment frequently. If several

different people will be using the transmitter, adjust it for the loudest voice.

WHILE SPEAKING,

ADJUST THE TRANSMITTER

AS YOU OBSERVE THE LEDs

ON THE RECEIVER

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