Audio Technica ATW-251, ATW-251/H, ATW-251/G, ATW-251/L, ATW-252 Installation And Operation Manual
200 Series Professional
VHF Wireless Systems
ATW-251 UniPak™System
ATW-251/G Guitar System
ATW-251/H Headworn Microphone System
ATW-251/L Lavalier Microphone System
ATW-252 Handheld Microphone System
Installation and Operation
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 any interference received, including interference
which 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
“body-pack” 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
cease when the RF transmitting source is turned off
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.
any medical-device disruption will
. Please
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), or a
lavalier mic (/L) for particular applications. All A-T Wireless
Essentials
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.
®
microphones and cables, available separately, are
™
body-pack transmitter systems
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See pages 8-9 for illustrations.
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
large metal objects. In multi-channel systems, position
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
The receiver provides unbalanced, aux-level output from a 1/4"
TS (“mono”) phone jack; an output cable is not included. Use
a shielded audio cable with
1
/4" phone plug to connect the
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
operating environment. Be certain to extend both antennas to
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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