Page 1
Professional VHF Wireless Systems
PRO227 UniPak™System with Instrument Cable
PRO227H UniPak
™
System with Headworn Microphone
PRO227L UniPak
™
System with Lavalier Microphone
PRO228 Handheld Dynamic Microphone System
Installation and Operation
Page 2
2
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 Audio-Technica wireless microphone
system is the successful result of years of design and
manufacturing experience.
This professional wireless system includes a receiver and
either a body-pack or a handheld transmitter on a specific
crystal- controlled frequency.
The receiver features true diversity reception. Two antennas
feed two completely independent RF sections on the same
frequency; automatic logic circuitry continuously compares and
selects the superior received signal, providing better sound
quality and reducing the possibility of interference and dropouts.
The receiver is made to be mounted in a standard 19" rack (1U).
The versatile UniPak
™
body-pack transmitter has both low- and
high-impedance inputs plus a bias connection, for use with
dynamic and electret condenser microphones, as well as Hi-Z
instrument pickups. Both the handheld and UniPak transmitters
use internal 9-volt batteries and have Off/Standby/On switches,
battery condition indicators, and battery-save switches.
Please note that in multiple-system applications there must be
a transmitter-receiver combination on a
separate
frequency for
each input desired (only one transmitter for each receiver).
Because the wireless frequencies are in or near VHF TV frequencies, only certain wireless frequencies are useable in a
particular geographic area. Also, only certain of the available
operating frequencies may be used together. (Frequency selection
information will found on page 7.)
Location
For best operation the receiver
should be at least 3 ft. above
the ground and at least 3 ft.
away from a wall or metal surface to minimize reflections.
The transmitter should also be
at least 3 ft. away from the
receiver, as shown in Figure A.
Keep antennas away from noise
sources such as digital equipment, motors, automobiles, and
neon lights, as well as large metal objects.
Output Connections
There are two audio outputs on the back of the receiver:
balanced (220 mV) and unbalanced (350 mV). Use shielded
audio cable for the connection between the receiver and the
mixer. If the input of the mixer is a
1
/4" jack, connect a cable
from the
1
/4" unbalanced audio output on the back of the receiver to the mixer. If the input of the mixer is an XLR-type input,
connect a cable from the balanced XLR-type audio output on
the back of the receiver to the mixer.
The two isolated audio outputs permit simultaneous feeds to
both unbalanced and balanced inputs. For example, both a guitar amp and a mixer can be driven by the receiver.
Antennas
Assemble the two whip antennas
to the special connectors provided.
Screw the whips into the threaded
side holes at the rear of the connector
(Fig. B).
Attach the antennas to the antenna
input jacks. The antennas are normally
positioned in the shape of a “V”
(45° from vertical) for best reception.
Do not try to move the antenna rod
after the connector shell has been
tightened down. Always loosen the
connector shell completely before
repositioning the rod.
If there is not sufficient space above the receiver and/or if the
receiver is installed in a metal cabinet, the antennas can be
mounted in the threaded holes in the back of the connectors
so the antennas will stick straight out from the back of the
receiver. Use one set of threaded holes or the other; do not
attempt to bend the antenna rods. (The optional accessory
ATW-RA1 rack-mount antenna kit brings antenna inputs to the
front of the receiver.)
Power Connections
Connect the included AD1205A AC adapter to the DC power
input on the back of the receiver. Then plug the adapter into a
standard 120 volt 60 Hz AC power outlet.
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.
Individuals with implanted cardiac pacemakers or
AICD devices: Please see notice on back cover.
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.
Installation and Operation
Receiver Installation
Introduction
Fig. A Receiver Location
Fig. B
Antenna Assembly
ANT. A
Page 3
VHF DIVERSITY RECEIVER
MIN MAX
AF PEAK
AF LEVEL
SQ. ADJ.
TUNER A TUNER BPOWER
OFFON
Front Panel Controls and Functions (Fig. C)
1. POWER SWITCH: Press switch on, and the “power”
indicator will light.
2. POWER INDICATOR.
3. TUNER OPERATION INDICATORS: Indicate which tuner
has the better reception and is in operation.
4. AF PEAK INDICATOR: Indicates when maximum transmitter
modulation without distortion has been reached.
5. SQUELCH CONTROL: Adjusts level of noise-muting circuit
(preset at factory but can be adjusted as circumstances
warrant).
6. AF LEVEL CONTROL: Adjusts the level at both audio
output jacks. Does not affect AF Peak indicator.
7. MOUNTING ADAPTERS: For mounting the receiver in any
standard 19" rack. Attach to receiver with screws supplied.
Rear Panel Controls and Functions (Fig. D)
8. TUNER “B” ANTENNA JACK: Antenna connector for
tuner “B.” Attach the antenna directly, or extend it with
an antenna cable.
9. BALANCED AUDIO OUTPUT JACK: XLRM-type connector.
A standard 2-conductor shielded cable can be used to
connect the receiver output to a balanced aux-level input
on a mixer.
10. GROUND LIFT SWITCH: Disconnects the ground pin of
the balanced output (9) from ground. Normally, the switch
should be to the left (ground connected). If hum caused by
a ground loop occurs, slide switch to the right.
11. UNBALANCED AUDIO OUTPUT JACK:
1
/4" phone jack.
Can be connected to an unbalanced aux-level input of
a mixer or tape recorder.
12. DC POWER INPUT: For the provided AD1205A AC adapter,
or other 12-18V DC source. (Receiver requires 350 mA.)
13. TUNER “A” ANTENNA JACK: Antenna connector for
tuner “A.” Attach the antenna directly, or extend it with
an antenna cable.
Receiver Controls and Functions
Fig. C Receiver Front Panel
Fig. D Receiver Rear Panel
ANT. B ANT. A
AF OUT
BALANCED
GROUND
LIFT
GROUND
AF OUT
UNBALANCED
DC 12V~18V
350 mA
3
21
8 9 11
1210
13
3 34 5 6 77
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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.
2. Lift the white “battery keeper” arm, and insert a 9V battery.
Be certain to observe correct polarity as marked inside the
battery compartment (Fig. G). The transmitter housing is
designed to prevent incorrect installation of the battery.
Do not force the battery in.
3. Replace the lower body cover.
Do not overtighten.
Battery Selection
An alkaline 9-volt battery is recommended.
UniPak
™
Transmitter Battery Installation:
1. Slide off the battery cover as shown in Figure E.
2. Carefully insert a fresh 9-volt alkaline battery, observing
correct polarity as marked inside the battery compartment.
The transmitter housing is designed to prevent incorrect
installation of the battery.
Do not force the battery in.
3. Replace the battery cover (Fig. F).
Battery Condition Indicator:
The red battery condition indicator (Fig. I/J) 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.
Battery-Save Switch:
Both transmitters feature battery-save switches (Fig. E/G). As
supplied, the switch is set in the “H” (high) position for maximum range. Switching to the “L” (low) position increases battery
life by reducing power. (Note: Effective range decreases when
the switch is set at the “L” position.)
UniPak Transmitter Input Connection:
Connect an audio input device (microphone or guitar cable) to
the HRS input jack on the bottom of the transmitter.
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.
Transmitter Setup
Fig. I Fig. J
Fig. G
Fig. H
Fig. E
Fig. F
TRANSMITTER
UniPak™
BATT.
ON OFF
ST.BY
INPUT POWER BATT. ANT
OFF
ONST
4
Battery Polarity
Diagram
Battery-Save
Switch
Battery Polarity
Diagram
Battery-Save Switch
(under screwdriver clip)
Screwdriver
Gain Trimmer
(VR1)
Guitar Trimmer
(GT)
Microphone
Trimmer (MT)
Battery Condition
Indicator
Power Switch
On/Standby/Off
Battery Condition
Indicator
Input
Connector
Power Switch
Off/Standby/On
Antenna
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Ten Tips To Obtain The Best Results
Check the frequency of the system against the chart on page 7
to ensure you have a proper frequency for your area. The frequency is marked on the back panel of the receiver.
Turn down the AF Level control of the receiver as well as
the mixer. Switch on the receiver only. Do
not
switch on the
transmitter yet.
Receiver On . . .
The power indicator will light up and one of the diversity indicator LEDs (A or B) will light, even though the transmitter is
not on.
Transmitter On . . .
The transmitters have a 3-position power switch. When the
switch is set to “Standby,” the transmitter produces RF with no
audio signal. When the switch is “On,” the transmitter produces
both RF and audio. With the switch “Off,” there is minimum
noise output due to a special A-T muting system.
Receiver Squelch
The squelch control on the front panel of the receiver is preset
at the factory, but can be adjusted if you must use the system
in an area with considerable RF interference. If there is audio
output from the receiver when
your
transmitter is
off,
adjust
the squelch control so the system will receive the signal from
your
transmitter but “squelch” or eliminate the unwanted
background RF noise. This adjustment can cause a reduction in
useable range of the wireless transmitter, so set the control to
the
lowest
position that reliably mutes the unwanted RF signals.
Input Level Adjustment
Input trimmer controls in the transmitters enable you to use
microphones or guitars with different sensitivities, or to adjust
for different acoustic levels.
UniPak Transmitter
Slide the battery cover off the top part of transmitter and
remove the screwdriver from its clip (Fig. E). Gently turn the
“MT” (mic trimmer) and “GT” (guitar trimmer) controls to their
full counter-clockwise positions.
Adjusting microphone input level:
With typically-loud acoustic input level to the microphone,
carefully turn the MT control clockwise while watching the
receiver’s AF Peak indicator. Increase the MT control setting
until the AF Peak indicator lights. This indicates that maximum
transmitter modulation without significant distortion has been
reached.
(When using a guitar, return the MT control setting
to minimum.)
Adjusting guitar/instrument input level:
While playing at typically-loud levels, carefully turn the GT control clockwise while watching the receiver’s AF Peak indicator.
Increase the GT control setting until the AF Peak indicator
lights. This indicates that maximum transmitter modulation
without significant distortion has been reached.
(When using
a microphone, return the GT control setting to minimum.)
After adjusting input levels, 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.
Handheld Transmitter
Unscrew the lower body cover and slide it downward, exposing
the screwdriver and gain trimmer (Fig. H). Remove the screwdriver and
gently
turn this gain trimmer control to its full
counter-clockwise position.
With acoustic input to the microphone at typically-loud levels,
carefully turn the trimmer control clockwise while watching
the receiver’s AF Peak indicator. Increase the control setting
until the AF Peak indicator lights. This indicates that maximum
transmitter modulation without significant distortion has been
reached.
Return the screwdriver to its clip and close and secure the
lower body. (Make certain that the white “battery keeper”arm
is inside the body.) No further transmitter gain adjustments
should be needed, as long as the acoustic input does not
change significantly.
System Operation
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.
4. The receiver antennas should be in the open and away from
any metal. If in a rack, have the unit on top or angle antennas
outward away from the metal rack.
5. A receiver cannot receive signals from two transmitters at the
same time.
6. The power switch on the transmitter has three positions:
“Off,” “Standby” and “On.” In the middle “Standby” position,
the transmitter sends only RF to the receiver; the audio source
is turned off.
7. For best operation, adjust the guitar or mic trimmer only until the
maximum output lights the AF Peak indicator (don’t overmodulate).
8. If the AF Level control of the receiver is set too high, it may
over-drive the input of the mixer or clip the output of the receiver,
causing distortion. Conversely, if the receiver output is set too
low, the overall signal-to-noise ratio of the system may be reduced.
Adjust the output level of the receiver so the highest sound pressure
level going into the microphone 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. In multiple-system applications, set the battery-save switches
on “L” (low) if possible, to reduce the chance of intermodulation
problems.
CAUTION!
The small trimmer controls are delicate; use
only the supplied screwdriver. Do not force the trimmers
beyond their normal 260
o
range of rotation.
Return the screwdriver to its storage clip when not in use.
5
Page 6
Optional System Accessories
MICROPHONES
AT829cW AT829 miniature cardioid condenser microphone only,
terminated for use with UniPak transmitter. Includes
clothing clip and windscreen.
MT830cW MT830R subminiature omnidirectional condenser microphone
only, terminated for use with UniPak transmitter. Includes
clothing clip and windscreen.
AT831cW AT831b miniature cardioid condenser microphone only,
terminated for use with UniPak transmitter. Includes
clothing clip and windscreen.
AT851cW AT851a surface-mount wide-range hemi-cardioid condenser
microphone only. Ideal for high-quality sound reinforcement
and teleconference applications where minimum visibility
is required. The cable is terminated for use with UniPak
transmitter.
AT857AMLcW AT857AMLa 19" gooseneck cardioid microphone only,
terminated for use with UniPak transmitter. Mounts to
5
/8"-27 thread. Includes windscreen.
ATM35cW ATM35 wide-range miniature cardioid condenser microphone
only. Uniquely capable of picking up high-intensity sound
without distortion. The cable is terminated for use with
UniPak transmitter. Includes UniMount
™
microphone
instrument mount.
ATM75cW ATM75 headworn cardioid condenser microphone only,
terminated for use with UniPak transmitter. Includes
windscreens and cable clip.
PRO8HEcW PRO8HE headworn hypercardioid dynamic microphone
terminated for use with UniPak transmitter. Includes
windscreen and cable clip.
RECEIVER ACCESSORIES
ATW-A10 Pair of ground-plane antennas with 5/8"-27 thread for
mounting to mic stands, etc. Takes RF cables with PL259
connectors, not included.
ATW-D12 Active, unity-gain antenna distribution system provides two
“1-in, 4-out” amplifier/splitters, connects a pair of antennas
to as many as four diversity receivers. Includes eight
output cables and two input cable adapters.
ATW-RA1 Rack-mount antenna kit brings antenna inputs to the front
of receiver for ease of setup, or when receiver is enclosed
in a metal rack. Includes a pair of extendible antennas.
TRANSMITTER ACCESSORIES
ATW-VP10 Vinyl pouch with belt clip to hold UniPak transmitter.
AT8114 Foam windscreen for handheld transmitter.
AT8141 Water-resistant pouch for UniPak transmitter.
AT8431 Stand clamp for handheld transmitter, 5/8"-27 threads.
XLRW Connecting cable for UniPak transmitter with an XLRF-type
input connector, for Lo-Z microphones with XLRM-type
output terminations.
6
Specifications
†
OVERALL SYSTEM
Operating Frequency VHF high band, 169 MHz to 216 MHz
Frequency Stability ±0.005%, single-frequency
crystal-controlled
Modulation Mode FM
Maximum Deviation Range ±30 kHz, traveling frequencies ±15 kHz
Operating Range 200' minimum
Operating Temperature Range 40° F (4° C) to 110° F (43° C)
Frequency Response 100 Hz to 15 kHz
RECEIVER
Receiving System Dual independent receivers, automatic-
switching diversity reception
Image Rejection ≥60 dB
Signal-to-noise Ratio >80 dB at 10 kHz deviation (IEC-weighted)
Total Harmonic Distortion ≤1% (10 kHz deviation @ 1 kHz)
Sensitivity 10 µV for 60 dB S/N (IEC -weighted)
Audio Output
Unbalanced 350 mV (at 1 kHz, ±10 kHz deviation,
10k ohm load)
Balanced 220 mV (at 1 kHz, ±10 kHz deviation,
10k ohm load)
Output Connectors
Unbalanced
1
/4" phone jack
Balanced XLRM-type
Power Supply 12-18V DC, 350 mA, with provided
AC adapter
Dimensions 16.93" (430.0 mm) W x 1.92" (48.8 mm) H
x 7.28" (185.0 mm) D
Weight 5.5 lbs (2.5 kgs)
Accessories Included Two whip antennas, rack mount adapters,
AD1205A AC adapter
UNIPAK™TRANSMITTER
RF Power Output 50 mW Max
Spurious Emissions Under federal regulations
Dynamic Range ≥90 dB
Input Connections High impedance, low impedance, bias
Battery 9V (NEDA type 1604) alkaline,
not included
Current Consumption 30 mA typical
Battery Life
Approximately 15 hours in “H” (high) position
Approximately 20 hours in “L” (low) position
Dimensions 2.56" (65.0 mm) W x 4.33" (110.0 mm) H
x 1.00" (25.4 mm) D
Net Weight (without battery) 2.8 oz (78 grams)
HANDHELD TRANSMITTER
Polar Pattern Unidirectional
RF Power Output 50 mW Max
Spurious Emissions Under federal regulations
Dynamic Range ≥90 dB
Microphone Element Audio-Technica Hi-ENERGY®dynamic
Battery 9V battery (NEDA type 1604) alkaline,
not included
Current Consumption 30 mA typical
Battery Life
Approximately 15 hours in “H” (high) position
Approximately 20 hours in “L” (low) position
Dimensions 9.50" (241.3 mm) long, 2.10" (53.3 mm) dia.
Net Weight (without battery) 12.7 oz (360 grams)
Accessory Included Stand clamp
† In the interest of standards development, A.T.U.S. offers full details on its test methods
to other industry professionals on request.
Page 7
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- or three-character
code, such as “T2” or “11G,” in addition to the actual frequency
in MHz. The frequency of each transmitter appears on a label
on the outside of the unit. The frequency of each receiver
appears on a label on the back of the unit and the frequency of
each system appears on the outer carton. For future reference,
please record them in the space provided.
Because most of these authorized frequencies are shared
with TV broadcasting, frequency selection is largely dependent
upon which TV broadcast channels are in operation
where the
wireless system is to be used.
RF Interference
If you encounter receiving interference (from other than an
operating TV station), often it can be eliminated by adjusting
the receiver’s squelch control, as described on page 5.
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 Government or
non-Government operation, the wireless microphone must
cease operation…”
If you need assistance with operation or frequency selection,
please contact your dealer or the A-T professional division.
For future reference, please record your system information here (the serial numbers appear
inside the battery compartment of each transmitter, and on the back of each receiver):
Operating Frequency
Freq. Code ____ ____ ____ Frequency ____ ____ ____ •____ ____ ____ MHz
Receiver
Model __________________ Serial Number ____ ____ ____ ____ ____ ____ ____
Transmitter
Model __________________ Serial Number ____ ____ ____ ____ ____ ____ ____
Application Freq. Code Freq. (MHz)
• Traveling frequencies: T2 169.505
(Normally work anywhere in the U.S.A. and Canada, T3 170.245
but as a result tend to be crowded.) T8 171.905
• For use only where there is no TV Channel 7: 7G 175.800
7I 176.200
• For use only where there is no TV Channel 8: 8D 181.200
8M 183.200
8S 184.200
• For use only where there is no TV Channel 9: 9F 187.600
9Q 189.800
• For use only where there is no TV Channel 10: 10C 193.000
10J 194.400
10W 196.800
• For use only where there is no TV Channel 11: 11G 199.800
11S 202.200
• For use only where there is no TV Channel 12: 12L 207.000
12S 208.200
12V 208.600
• For use only where there is no TV Channel 13: 13B 210.800
13Q 213.800
Multi-channel Systems
Following are groupings of frequencies suggested for multi-channel wireless systems.
• For use where TV channels 7, 9, 11 and/or 13 are operating: 8D-8M-8S-10C-10J-10W-12L-12S-12V
Traveling frequencies T2, T3 and/or T8 may be used with any of the above frequencies except for: 8D, 8M
and 10C. Interference may result from the use of these frequency combinations.
• For use where TV channels 8, 10 and/or 12 are operating: 7G-7I-9F-9Q-11G-11S-13Q or
7G-7I-9F-11G-11S-13B-13Q
Traveling frequencies T2, T3 and/or T8 may be used with any of the above frequencies with no
interference problems.
Wireless Operating Frequencies
Audio-Technica Wireless Operating Frequencies
7
Page 8
One-Year Limited Warranty
Audio-Technica professional wireless systems purchased in the U.S.A. are warranted for one year from date of purchase by Audio-Technica U.S., Inc.
(A.T.U.S.) to be free of defects in materials and workmanship. In event of such defect, product will be repaired promptly without charge or, at our
option, replaced with a new product of equal or superior value if delivered to A.T.U.S. or an Authorized Service Center, prepaid, together with the
sales slip or other proof of purchase date.
Prior approval from A.T.U.S. is required for return.
This warranty excludes defects due to normal wear,
abuse, shipping damage, or failure to use product in accordance with the instructions. This warranty is void in the event of unauthorized repair or
modification, or removal or defacing of the product labeling.
For return approval and shipping information,
contact the Service Dept., Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224.
Except to the extent precluded by applicable state law,
A.T.U.S. will have no liability for any consequential, incidental, or special damages; any
warranty of merchantability or fitness for particular purpose expires when this warranty expires.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.
Outside the U.S.A., please contact your local dealer for warranty details.
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224 330/686-2600
P50957-B/W ©1996 Audio -Technica U.S., Inc. Printed in U.S.A.
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
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.
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