Lectrosonics M175 User manual

Quick
Start
Guide
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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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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