Comtek M-169 Manual de usuario
M-169 OPERATOR’S MANUAL (PRELIMINARY)
357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • http://www.comtek.com
M-169
Wireless
Microphone
Transmitter
© 2008 COMTEK®All rights reserved.
Printed in the U.S.A. 0808M169
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 ............................................
Specifications .........................................................
Warranty and Service ..................................................
1
2
3
4
5
6-7
7
8
9
10
11
12
INTRODUCTION
Page 1
M-169
Wireless
Microphone
Transmitter
The M-169 transmitter offers the
ultimate performance and
versatility for applications where
one-way personal communication is
required. This compact, personal
transmitter is ideal for instructors and
presenters who must communicate
with persons some distance away or
in a noisy environment.
The M-169 incorporates the latest digital
and analog technologies to produce low
residual noise, wide dynamic range, and
extendedfrequencyresponserendering
the most natural sound possible from a
personal communications system.
The audio processing circuit produces
fullfidelityfrequencyresponsefrom
100 Hz to 10 kHz in the companded
or non-companded mode to
accommodateagreatervarietyof
receivers. OperatingunderFCC
Regulation Part 90 the M-169
has greater transmission range
and reliability.
Setup
a. Check to ensure that the M-169 transmitter’s radio frequency channel is
the same as the associated COMTEK receiver’s channel.
(Channels and mode of operation are indicated by the rotary channel
selector switches on the back of the transmitter. See page 8 and 9.)
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 20 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
allowedtocharge at least twelvehoursto bring ittofullcharge
(seepage5for batterychargerinstructions).
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: The48-inch microphone cord alsofunctions as part ofthe
transmitter’santenna system. For optimumperformance, this cord
shouldbefullyextended. Coilingorbunchingthemicrophone
cordmay reduce the range of the transmitter. Thetransmitter
shouldbecarried by thesnap-onbeltclip(included)orin a pocket
orbelt-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.Afull 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.
M-169 SETUP
Page 2
Page 3
M-169 CONTROLS
nCHANNELAND MODE SWITCHES: These rotary
switches are used to set the transmitter to the desired
operating frequency and companded or non-companded
mode of operation.
(See page 8 and 9 for frequency selection chart.)
oBATTERY COMPARTMENT: The 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.
pAUXILIARYAUDIO INPUT JACK:
Allows transmitter to use line level,
earphone level, or fixed AUX as an
audio source.
qAUDIO“VOICE”MODULATION
INDICATOR:
This indicator is used in making adjustment
with the Audio Input Gain Control.
rMIC / ANTENNA JACK: This jack accepts an
electret type microphone having a 48” long cord with
a micro-mini 2.5mm mono plug. The microphone cord
functions as part of the transmitter’s antenna system
and must be in place for auxiliary audio input operation.
If microphone function is not necessary, the optional
microphone switch should not be on for this operation.
sPOWER/ BATTERYSTATUSINDICATOR: This LED
indicator will illuminate 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.
tOPTIONALMIC SWITCH: This switch turns off the microphone without turning off
the transmitter carrier.
uAUDIOINPUT GAIN CONTROL: This is a microphone and AUX level input gain
control. This control is used with the “Voice” modulation indicator.
vON / OFF SWITCH: This switch turns the transmitter on and off.
Page 4
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 the transmitter is turned on,
the LED illuminates. If the battery is low,
the green LED will blink rapidly to warn
you that the battery will soon be dead.
Replace a low battery immediately.
M-169 BATTERY REMOVAL / REPLACEMENT
Pull back battery door latch and allow battery
cover door to spring open. To remove battery,
simplymanipulate the bottom of batteryoutof
thecompartmentandremove.
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.
Battery indicator LED
Battery Removal / Replacement
Page 5
M-169 BATTERY CHARGING
Battery Charging
1. Make sure that a seven cell 9 volt Ni-MH rechargeable
battery is used with a minimum of 200 mAh capacity.
(Alkaline batteries must not be charged.)
2. Make sure the M-169 is turned OFF.
3. Note that the red charging indicator on the charger is ON when the M-169
is plugged into the charger through the audio output jack.
4. When using the NBC 9-2C charger allow the battery to charge for 14 hours
for a full charge. Unit must then be unplugged. When using the
NBC 9-3-1 digital fast charger the charger will automatically end the
charge cycle and the red LED will change to green. With this charger
the unit may be left in the charger until the unit is used.
5. Periodically open the battery compartment on stored COMTEK units to
check for battery leakage. If a battery is leaking, it must be discarded,
and the battery compartment must be cleaned or returned to COMTEK’s
service department for repairs.
IMPORTANT
NBC 9-2C
14-hourcharger NBC 9-3-1
digitalfast charger
Page 6
M-169 AUXILIARY AUDIO INPUT OPERATION
Auxiliary Audio Input Operation
The M-169 transmitter may transmit a variety of audio sources such as tape
and C.D. players, TV and VCR’s, or any audio device having an auxiliary or
line level audio output.
The auxiliary input cable supplied with the M-169
transmitter(CB-36 ST)will operate with any device
having a mini 3.5 mm jack, stereo or mono, and
with line level or earphone level output.
To accommodate a variety of specialty
applications, auxiliary input cables
with RCA phono plug, 1/4” audio
phone plug, and XLR connectors are
availablefrom COMTEK.
Setup
a. Connect the microphone
to the transmitter by
inserting the microphone
plug into the receptacle on
thetopofthetransmitter.
Note: Themicrophone
cordfunctionsas part of the
transmitter’santennasystem
and must be in place for auxiliary
audioinputoperation. Ifmicrophone
functionisnotnecessary, the optional microphone
switchshouldnotbeonforthisoperation.
b. Connect the proper auxiliary input cable to the audio source. Connect the
right-angle mini plug end of the auxiliary input cable in the “AUX” input
jack of the M-169 transmitter.
Note: Checkto ensure that theaudio source isa line level, earphonelevel,
orfixedAUXleveloutput.
PDA
Page 7
Beltclip installation
M-175 SNAP-ON BELT CLIP (Included)
Belt clip removal
c. Turn on the transmitter with program from the audio source being fed to
the transmitter. Observe the audio “voice” level modulation indicator. Afull
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.
d. When using the auxiliary audio input with the microphone plugged into
the transmitter, priority should be given to the microphone gain adjustment.
The mixing balance between the auxiliary audio and the microphone should
be made with the volume control of the auxiliary audio source.
Note:The optional microphone switch only affects the
microphone. It does not affect the auxiliary audio input.
M-169 AUX OPERATION (Cont.) / SNAP-ON BELT CLIP
STEP1:
Hook belt clip
retaining lip over
front case ridge.
STEP2:
Rotate belt clip down onto case. Apply
pressure on both sides of clip, snapping
clip retainers into slots.
Clip retainer
Retainer slot Belt clip removal indent
Flex out and pull down with your
thumb or a large coin (quarter) to
unsnap belt clip from case.
Page 8
Frequency Selection (169.445 - 171.905 MHz)
The M-169 transmitter can operate on eight FCC dedicated assigned
channelsfor wireless microphoneoperationunder FCC RegulationPart90.
These channels may be used in two groups of four channels for
multi-channel operation. (Refer to frequency charts on page 9.)
After you have determined the channel on which
you are going to operate, position the two rotary
switches to indicate the channel and the mode of
operation. The left rotary switch determines
mode of operation. Position “1” is for
COMTEK companded receivers. Position
“0” is for non-companded receivers of
different manufacturesother than COMTEK.
The right rotary switch selects the frequency by
channel number (1-8). (Refer to frequency chart on page 9.)
Multiple Channel Operation
When multiple transmitters are broadcasting in the same immediatearea
(within 100 feet), the RF signals will “mix” together generating additional
signals. Ifthese product frequenciesare too closeto a frequencywhich you are
using,you will experience intermodulationinterference. This condition is
commontoallradioreceiverstosomeextent.
Simultaneous operation of more than three channels requires frequency
coordination to avoid intermodulation interference which could result in
poor or unusable performance.
To avoid this type of interference,you should select frequencies from one
of the standard groups (see group frequency charts on page 9), or use COMTEK’s
frequency selection software available at www.comtek.com to determine appropriate
frequencies or contact COMTEK to obtain a free copy.
M-169 FREQUENCY SELECTION
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