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200 Series Professional
VHF Wireless Systems
AT W-251 UniPak®Transmitter System
AT W-251/G Guitar System
AT W-251/H Headworn Microphone System
AT W-251/H92 Headworn Microphone System
AT W-251/H92-TH Headworn Microphone System
AT W-251/L Lavalier Microphone System
AT W-252 Handheld Microphone System
Installation and Operation
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Professional VHF Wireless Systems
Installation and Operation
This device complies with part 15 of the FCC Rules.
Operation is subject to the condition that this device does
not cause harmful interference.
This device complies with INDUSTRY CANADA R.S.S. 210,
en conformité avec IC: RSS-210/CNR210. Operation is subject to the following conditions: 1) This device may not
cause harmful interference and 2) this device must accept
ny interference received, including interference which
a
may cause undesired operation. Changes or
modifications not expressly approved by Audio-Technica
could void your authority to operate this equipment.
CAUTION! Electrical shock can result from removal of
the receiver cover. Refer servicing to qualified service
personnel. No user-serviceable parts inside. Do not
expose to rain or moisture.
The circuits inside the receiver and transmitter have been
precisely adjusted for optimum performance and compliance with federal regulations. Do not attempt to open the
receiver or transmitter. To do so will void the warranty,
and may cause improper operation.
Notice to individuals with implanted cardiac pacemakers
or AICD devices:
Any source of RF (radio frequency) energy may interfere with
normal functioning of the implanted device. All wireless
microphones have low-power transmitters (less than 0.05
watts output) which are unlikely to cause difficulty, especially
if they are at least a few inches away. However, since a “bodypack” mic transmitter typically is placed against the body, we
suggest attaching it at the belt, rather than in a shirt pocket
where it may be immediately adjacent to the medical device.
Note also that any medical-device disruption will cease when
the RF transmitting source is turned off. Please contact your
physician or medical-device provider if you have any questions,
or experience any problems with the use of this or any other
RF equipment.
Introduction
Thank you for choosing an Audio-Technica professional wireless
system. You have joined thousands of other satisfied customers
who have chosen our products because of their quality,
performance and reliability. This wireless microphone system
is the successful result of years of design and manufacturing
experience.
Each 200 Series professional VHF wireless system includes a
receiver and either a body-pack transmitter or a handheld
microphone/transmitter on a specific crystal-controlled
frequency. ATW-251 UniPak
include models pre-packaged with either an AT-GCW guitar
cable (/G), a PRO 8HEcW headworn microphone (/H), a
PRO 92cW headworn microphone (/H92), a PRO 92cW-TH
headworn microphone (/H92-TH), or a lavalier mic (/L) for
particular applications. All A-T Wireless Essentials
and cables, available separately, are pre-terminated for use with
any ATW-251 system.
Because 200 Series packaging is designed to hold all versions
of the system, some compartments in the carton are
intentionally left empty.
The ATW-R250 receiver includes a space-saving switching
power supply that automatically adapts to changes in mains
voltage. Unlike bulky linear power supplies, this switching power
supply is lightweight and compact; it uses only a single outlet
space.
The versatile ATW-T201 UniPak body-pack transmitter has both
a high-impedance input for instruments, and a low-impedance
input with bias connection for use with dynamic and electret
condenser microphones. The ATW-T202 handheld transmitter
features a unidirectional dynamic microphone element.
Both the body-pack and handheld transmitters use internal
9-volt batteries and have Off/Standby/On switches, input Trim
(level) adjustments and battery-save switches.
®
body-pack transmitter systems
®
microphones
2
See pages 8-9 for illustrations.
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Receiver Installation
Location
For best operation the receiver should be at least 3' (1 m)
above the ground and at least 3' (1 m) away from a wall or
metal surface to minimize reflections. Keep the receiver
antennas away from noise sources such as digital equipment,
motors, automobiles and neon lights, as well as away from
arge metal objects. In multi-channel systems, position
l
receivers at least 3' (1 m) apart and keep operating
transmitters at least 6' (2 m) from the receivers to help assure
maximum RF performance.
Output Connection
1
The receiver provides unbalanced, aux-level output from a
TS (“mono”) phone jack; an output cable is not included. Use
shielded audio cable with
a
1
phone plug to connect the
/4"
/4"
receiver’s AF Out jack to the mixer/amplifier’s aux-level input.
Power Connection
Connect the DC plug on the included AC power adapter to the
DC power input on the back of the receiver. Secure the cord
over the cord hook on the back of the receiver, to keep the
plug from being detached by an accidental tug on the cord.
Then plug the adapter into a standard 120 Volt 60 Hz AC power
outlet.
(Note that the receiver has no power Off/On switch.The
receiver will be energized whenever the power adapter is
connected and plugged into the AC outlet. Unplug the power
supply from the AC outlet when the system is not in use –
both for safety, and to conserve energy.)
Antennas
A novel “dipole” antenna system on the receiver improves
operation by providing a “ground” element in addition to the
usual “signal” element. Position the two antennas at 90° in the
form of a “V,” or position the left (“signal”) antenna vertically
and the right (“ground”) antenna horizontally, in the shape of
an “L” (Fig. A). Use the position that performs better in your
perating environment. Be certain to extend both antennas to
o
their full 15" (38 cm) length by holding them at their bases and
pulling out on their caps. Both antenna elements may be
swiveled to the left and right, but do not attempt to rotate them
in a screwing/unscrewing motion. To do so may damage the
antenna and/or receiver. For best performance, locate the
receiver so its antennas are in direct line-of-sight to the
transmitter's likely operating position.
Receiver Controls and Functions
Front Panel Controls and Functions (Fig. B)
1. ANTENNAS: Position the “signal” antenna (1a) and
“ground” antenna (1b) as shown in Figure A.
2. POWER INDICATOR: Lights when power is supplied to
the receiver.
3. RF INDICATOR: Lights to show presence of transmitter
signal.
4. AF PEAK INDICATOR: Only lights when audio distortion
is present at maximum modulation. Not affected by
position of Volume control.
Rear Panel Controls and Functions (Fig. C)
5. AUDIO OUTPUT JACK:
1
/4" TS (Tip-Sleeve) or “mono”
phone jack. Use a shielded cable to connect to an
unbalanced aux-level input of a mixer or amplifier.
6. VOLUME CONTROL: Adjusts the audio level at the
1
/4"
output jack. Does not affect AF Peak indicator.
7. CORD HOOK: Loop the cord around the cord hook to keep
the DC plug from pulling out accidentally.
8. POWER INPUT JACK: Connect the DC plug from the
included AC adapter.
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Transmitter Setup
Battery Selection and Installation
An alkaline 9-volt battery is recommended. Make certain the
transmitter power switch is Off before installing or changing
batteries.
When inserting the battery, observe correct polarity as
marked inside the battery compartment. The transmitter
ousings are designed to prevent incorrect installation of the
h
battery; do not force the battery in. Reversed batteries may
cause damage to the transmitter.
®
UniPak
Transmitter Battery Installation
1. Slide off the battery cover as shown in Figure D.
. Carefully insert a fresh 9V alkaline battery, observing polarity
2
markings.
3. Replace the battery cover (Fig. E).
Handheld Transmitter Battery Installation
1. While holding the upper part of the transmitter body just
below the ball-screen, unscrew the lower body cover and
slide it downward to expose the battery compartment
(Fig. F). Do not attempt to pull the lower body farther
down, or to gain access to the electronics.
2. Lift the white “battery keeper” arm until it sticks straight out
from the mic body (no higher). Then carefully insert a fresh
9V alkaline battery, observing polarity markings.
®
UniPak
Transmitter Input Connection
Connect an audio input device (microphone or guitar cable) to
he input connector on the bottom of the transmitter. The
t
cable connector latches automatically when inserted into the
transmitter jack. To unlatch and remove the connector, simply
pull up on the connector’s knurled metal collar.
A number of Audio-Technica professional microphones and
cables are available separately, pre-terminated with a UniPak
input connector (see www.audio-technica.com).
Transmitting Antenna
The UniPak transmitter includes a permanently attached flexible
antenna. For best results, allow the antenna to hang freely and
full length from the bottom of the transmitter. If the received
signal is marginal, experiment with different transmitter
positions on your body or instrument; or try repositioning the
receiver. Do not attempt to remove, replace or change the
length of the transmitting antenna.
3. Screw the body back together. Do not overtighten.
Battery Condition Indicator
The red battery condition indicator (Fig. H/I) should light strongly
with a fresh battery. As the battery weakens, the indicator will
grow dimmer. When the indicator becomes very dim or goes
out, there is little life left in the battery. Replace it at once for
continued operation of the transmitter.
All transmitters feature battery-save switches (Fig. D/F). As
supplied, the switch is set in the High position for maximum
range. Switching to the Low position increases battery life by
reducing power. (Note: Effective range decreases when the
switch is set in Low position.)
4
See pages 8-9 for illustrations.
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System Operation
Turn down the receiver volume control and the mixer/amplifier
evel before starting up the wireless system. Do not switch on
l
the transmitter yet.
Receiver on...
Plug the power supply into an AC power source. The green
Power indicator on the front panel will light.
ransmitter on...
T
When the transmitter is switched on, the receiver’s yellow RF
signal indicator will light. The transmitters have a 3-position
power switch. When the switch is set to “Standby” (ST or
ST.BY), the transmitter produces RF with no audio signal. When
he switch is “On,” the transmitter produces both RF and audio.
t
Excessive audio input to the transmitter will cause the receiver’s red AF Peak indicator to light.
Receiver Volume
Under typical operating conditions, the receiver's volume
control should be turned all the way up, with overall system
audio gain adjusted at the mixer or amplifier.
Input Level Adjustment
Input trimmer controls in the transmitters enable you to
maximize performance for a particular microphone or guitar
sensitivity, or to adjust for different acoustic input levels.
Adjusting Input Level - UniPak Transmitter
Slide the battery cover off the top part of transmitter and
remove the screwdriver from its clip (Fig. D). Gently turn both
the “MT” (Mic Trimmer) and “GT” (Guitar Trimmer) controls to
their full counterclockwise positions (toward “LO”).
• Microphone: Adjusting input level
Gently turn only the “MT” (Mic Trimmer) control all the way
up (clockwise, toward “Hi”). Check for excessive gain by speaking/singing into the microphone at typically loud levels while
watching the receiver’s AF Peak indicator. If the AF Peak indicator does light, turn the MT control slightly counterclockwise
until the AF Peak indicator no longer lights with maximum audio
input to the transmitter.
• Guitar/Instrument: Adjusting input level
Gently turn only the “GT” (Guitar Trimmer) control all the way
up (clockwise, toward “Hi”). Check for excessive gain by
playing at typically loud levels while watching the receiver’s AF
Peak indicator. If the AF Peak indicator does light, turn the GT
ontrol slightly counterclockwise until the AF Peak indicator no
c
longer lights with maximum instrument input to the transmitter.
After adjusting input level, return the screwdriver to its clip
and reinstall the battery cover. No further transmitter gain
adjustments should be needed, as long as the input device
and the acoustic input level are not changed.
Adjusting Input Level - Handheld Transmitter
Unscrew the lower body cover and slide it downward, exposing
the screwdriver and Gain Trimmer control (Fig. G). Remove the
screwdriver from its clip. Gently turn the control to its full
clockwise position (toward the side marked “H”), the factory
setting. Check for excessive gain by speaking/singing into the
microphone at typically-loud levels while watching the receiver’s
AF Peak indicator. If the AF Peak indicator does light, turn the
Gain Trimmer control slightly counterclockwise until the AF Peak
indicator no longer lights with maximum audio input to the
mic/transmitter.
Return the screwdriver to its clip and close and secure the
lower body. No further transmitter gain adjustments should
be needed, as long as the acoustic input does not change
significantly.
CAUTION! The small trimmer controls are delicate; use
only the supplied screwdriver. Do not force the trimmers
beyond their normal 190
o
range of rotation.
Return the screwdriver to its storage clip when not in use.
TenTips To Obtain The Best Results
1. Use only fresh alkaline batteries. Do not use “general purpose”
(carbon-zinc) batteries.
2. Position the receiver so that it has the fewest possible
obstructions between it and the normal location of the transmitter.
Line-of-sight is best.
3. The transmitter and the receiver should be as close together as
conveniently possible, but not less than 6' (2 m).
4. Do not place the receiver antennas within 3' (1 m) of another
receiver or antenna.
5. The receiver antennas should be kept away from any metal.
6. A receiver cannot receive signals from two transmitters at the
same time.
7. In the UniPak transmitter, the “MT” or “GT” input control not
in use should be set to minimum.
8. If the receiver output is set too low, the overall signal-to-noise ratio
of the system may be reduced. Conversely, if the volume control
of the receiver is set too high, it may over-drive the input of the
mixer/amplifier, causing distortion. Adjust the output level of the
receiver so the highest sound pressure level going into the
microphone (or the loudest instrument playing level) causes no
input overload in the mixer, and yet permits the mixer level
controls to operate in their “normal” range (not set too high or
too low). This provides the optimum signal-to-noise for the
entire system.
9. Turn the transmitter off when not in use. Remove the battery if
the transmitter is not to be used for a period of time.
10. Unplug the receiver from the AC outlet when the system is not
in use.
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ystem Operating Frequencies
S
Frequency Selection
Each transmitter/receiver system operates on a single factory
aligned, crystal-controlled frequency. Available frequencies are
shown in the chart below.
Operating frequency is specified by a two character code,
uch as “T2,” in addition to the actual frequency in MHz. The fre-
s
quency of each transmitter appears on a label on the outside of
the unit. The frequency of each receiver appears on a label on
the rear panel of the unit and the frequency of each system
appears on the outer carton. For future reference, please record
them in the space provided below.
Application Freq. Code Freq. (MHz)
• Traveling frequencies: T2 169.505
(Normally work anywhere in the U.S.A. and T3 170.245
Canada.) T8 171.905
RF Interference
Please note that wireless frequencies are shared with other
radio services. According to Federal Communications
Commission regulations, “Wireless microphone operations are
unprotected from interference from other licensed operations
within the band. If any interference is received by any
overnment or non-Government operation, the wireless
G
microphone must cease operation...”
If you need assistance with operation or frequency selection,
please contact your dealer or the A-T professional division.
Extensive wireless information also is available on the A-T Web
site at www.audio-technica.com.
Systems on these frequencies may be combined for up to three simultaneous
operating channels.
For future reference, please record your system information here (the serial numbers
appear near the screwdriver clip in each transmitter, and on the bottom of
each receiver):
Operating Frequency
Freq. Code Frequency • MHz
Receiver
Model ATW-R250 Serial Number
Transmitter
Model ATW-T20 Serial Number
1/2
6
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Specifications
†
OVERALL SYSTEM
perating Frequency VHF high band, 169 MHz to 172 MHz
O
Frequency Stability ±0.005%
odulation Mode FM
M
Maximum Deviation ±15 kHz
perating Range 200' typical
O
perating Temperature Range 40° F (4° C) to 110° F (43° C)
O
Frequency Response 80 Hz to 13 kHz
RECEIVER
eceiving System Non-diversity, single-channel,
R
dual antenna system
mage Rejection 50 dB minimum
I
Signal-to-noise Ratio 80 dB at 10 kHz deviation (IEC-weighted),
aximum modulation 15 kHz
m
Total Harmonic Distortion ≤1% (10 kHz deviation at 1 kHz)
ensitivity 20 dBµV for 60 dB S/N (IEC-weighted)
S
Audio Output 350 mV (1 kHz modulation, 10 kHz
deviation, 100k ohm load)
Output Connector
1
/4" TS (“mono”) phone jack
Power Supply 100-240V AC (50/60 Hz) to 12V DC 1A
(center positive) switched mode external
power supply
Dimensions 7.48" (190.0 mm) W x 1.65" (42.0 mm) H x
5.12" (130.0 mm) D
Net Weight 11.0 oz (311 grams)
Accessories Included Power supply
®
NIPAK
U
F Power Output High: 10 mW; Low: 2 mW, typical
R
RANSMITTER
T
Spurious Emissions Under Federal Regulations
ynamic Range ≥90 dB, A-weighted
D
Input Connections High impedance, low impedance, bias
attery (not included) 9V (NEDA type 1604) alkaline
B
urrent Consumption 30 mA typical
C
Battery Life Approximately 15 hours (High);
20 hours (Low), depending on battery type
nd use pattern
a
Dimensions 2.56" (65.0 mm) W x 4.33" (110.0 mm) H
1.00" (25.4 mm) D
x
Net Weight (without battery) 2.8 oz (78 grams)
HANDHELD TRANSMITTER
F Power Output High: 10 mW; Low: 2 mW, typical
R
Spurious Emissions Under Federal Regulations
ynamic Range ≥90 dB, A-weighted
D
icrophone Element Dynamic unidirectional
M
Battery (not included) 9V (NEDA type 1604) alkaline
Current Consumption 30 mA typical
Battery Life Approximately 15 hours (High);
20 hours (Low), depending on battery type
and use pattern
Dimensions 9.50" (241.3 mm) long, 2.10" (53.3 mm)
maximum diameter
Net Weight (without battery) 12.7 oz (360 grams)
Accessory Included AT8456a Quiet-Flex™stand clamp
†
n the interest of standards development, A.T.U.S. offers full details on its test methods to
I
ther industry professionals on request.
o
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Figure A (p. 3)
ntennas
A
Receiver Controls and Functions
Figure B - Front panel controls and functions
Figure C - Rear panel controls and functions
1a
5
2 3 4
6
1b
7
8
8
Page 9
Microphone
Trimmer (MT)
uitar Trimmer
G
GT)
(
Transmitter Controls and Functions
➞
attery Polarity
Battery-Save Switch
under screwdri ver clip)
(
Figure D Figure E
Figure F
B
iagram
D
Battery Polarity
Diagram
attery-Save
B
witch
S
➞
Figure G
Off/Standby/On
Input
Connector
Figure H
Power Switch
Battery Condition
Indicator
Antenna
Screwdriver
Gain Trimmer
Figure I
Battery Condition
Indicator
Power Switch
On/ Standby/Off
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Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224 330/686-2600 www.audio-technica.com
P5185 8-01 ©2011 Audio-Technica U. S., Inc. Printed in U.S.A.
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