COMTEK M-216 User Manual

M-216 OPERATOR’S MANUAL

M-216

Wireless
Microphone
Transmitter

357 West 2700 South • Salt Lake City, Utah 84115 • Phone: [phone] • Fax: [phone] • http://www.comtek.com

TABLE OF CONTENTS

Introduction ...........................................................

Setup ...............................................................................

Controls ..................................................................

Battery Removal / Replacement ......................................

Battery Charging ......................................................

Auxiliary Audio Input Operation ...................................

Snap-On Belt Clip .................................................

Frequency Selection ..............................................

Frequency Information .........................................

Optional Accessories ............................................

Options .................................................................

HH-185 ...................................................................

Trouble Shooting ..................................................

Specifications .........................................................

Warranty and Service ..................................................

1

2

3

4

5

6-7

7

8

9-10

11

12

13

14-15

16

17

© 2013 COMTEK® All rights reserved.
Printed in the U.S.A. 04-15-2013

INTRODUCTION

M-216

Wireless
Microphone
Transmitter

he M-216 wireless microphone transmitter

T

offers the ultimate performance and
versatility for assistive listening, language
interpretation, tour guide presentations,
personal communication, and for other
personal remote transmission situations.

The M-216 incorporates the latest digital and
analog technologies to produce low residual
noise, wide dynamic range, and extended
frequency response rendering the most natural
sound possible from a wireless microphone.

The transmitter’s microcontroller automatically
sets the modulation deviation, companding or
non-companding audio processing when
corresponding channels are selected. Because
of this comprehenive feature, this versatile
transmitter can transmit on 19 high fidelity
companded channels or 38 standard
channels ensuring compatibility with
receivers conforming to regulations
regarding Low Power Radio Service
(LPRS) transmissions in the 216-217 MHz
band under Part 95 of the FCC regulations.

Page 1

M-216 SETUP

Setup

a. Check to ensure that the M-216 transmitter’s radio frequency channel is

the same as the associated COMTEK receiver’s channel. (Channels are
indicated by the rotary channel selector switches on the back of the
transmitter. See page 3.)

b. Open the battery door cover on the transmitter (see page 4) and
insert a new nine volt alkaline battery (Eveready E522 or equivalent). This
type of battery will offer up to 30 hours of operation. Replace the battery before

every use if the demand for fail-safe operation outweighs battery cost. The use of
carbon batteries is not recommended.

NOTE: If a rechargeable battery is to be used, ensure that it has been
allowed to charge at least 14 hours to bring it to full charge (see page 5 for
battery charger instructions).

c. Connect the microphone to the transmitter by inserting the microphone

plug into the receptacle on the top of the transmitter. The transmitter is
operating when the transmitter power switch is turned on and the battery
status on indicator illuminates.

NOTE: The 36-inch microphone cord also functions as part of the
transmitter’s antenna system. For optimum performance, this cord
should be fully extended. Coiling or bunching the microphone
cord may reduce the range of the transmitter. The transmitter
should be carried by the snap-on belt clip (included) or in a pocket
or belt-clip pouch.

d. In a situation where an extremely loud voice or a very soft voice is used, it

is necessary to adjust the audio input gain control while observing the audio
“voice” level modulation indicator. A full bright LED indicates full audio
compression at 100% modulation. For best performance, the audio input
gain should be adjusted for some low level LED luminescence during
normal audio levels with occasional full bright peaks indicating 100%
modulation.

Page 2

M-216 CONTROLS

OPTIONAL COMPAND AUTO / OFF SWITCH: This switch

n

overrides the automatic selection of the companded channels for
non-companded operation.
(This switch should remain in the “Auto” position.)

CHANNEL SWITCHES: These rotary

o

switches are set to the same channel as the
receiver. Actual frequency of operation
must agree with the receiver.
(See page 10 for frequency selection chart.)

BATTERY COMPARTMENT: The

p

battery compartment features a hinged
battery cover and an alignment system that
ensures proper battery polarity. Battery
installation and removal is facilitated by simply
manipulating the bottom of the battery.

AUXILIARY AUDIO INPUT JACK:

q

Allows transmitter to use line level, earphone
level, or fixed AUX as an audio source.

AUDIO “VOICE” MODULATION INDICATOR:

r

This indicator is used in making adjustment with the
Audio Input Gain Control.

MIC / ANTENNA JACK: This jack accepts an

s

electret type microphone having a 36” long cord with a
micro-mini 2.5 mm mono plug. This jack is also used
for the R.F. output for the screw-in whip antenna
when only the auxiliary audio input is used.

POWER / BATTERY STATUS INDICATOR: This LED indicator will illuminate

t

continuously when the unit is on indicating normal operation. When the battery voltage
drops below 6 volts, the LED will flash rapidly indicating that a new battery is needed.

OPTIONAL MIC MUTE SWITCH: This switch turns off the microphone without

u

turning off the transmitter carrier.

AUDIO INPUT GAIN CONTROL: This is a microphone and AUX level input gain

v

control. This control is used with the “Voice” modulation indicator.

ON / OFF SWITCH: This switch turns the transmitter on and off.

w

Page 3

M-216 BATTERY REMOVAL / REPLACEMENT

Low Battery Indicator

The LED on the top of the transmitter
indicates the status of the battery as
well as indicating that the unit is turned
on. When turned on, the LED illuminates.
If the battery is low the green LED will
blink rapidly warning that the battery will
soon be dead. Replace a low battery
immediately.

Battery indicator LED

Battery Removal / Replacement

Pull back battery door latch and allow battery

cover door to spring open. To remove battery,

simply manipulate the bottom of battery out of

the compartment and remove.

To insert battery, face battery
with negative terminal in line with
large hole in battery compartment,
press battery into compartment and close
battery door until it snaps shut. Note: It is not
possible to put battery in backwards.

Page 4