Audio Technica ATW-1821 User manual

1800 Series (Dual-Channel) Owners Manual
1800 Series
Camera-mount UHF Wireless Microphone Systems (dual-channel)
ATW-1821 Body-pack Transmitters System
ATW-1822 Plug-on Transmitters System
ATW-1823 Plug-on and Body-pack Transmitters System
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.
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.
CAUTION! 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.
Warning: To prevent fire or shock hazard, do not expose this appliance to rain or moisture.
Attention: Pour prévenir feu ou choc électrique, ne pas exposé l’appareil à la pluie ou à
l’humidité.
1800 Series System Components (Dual-Channel)
All 1800 Series dual-channel systems include:
ATW-R1820 Dual-channel receiver
Two detachable antennas

Two 18” output cables, TA3F to XLRM
Pouch with belt clip (holds receiver)
Hook & loop fastener mount
Each of the three dual-channel camera-mount wireless systems also
includes the following:
ATW-1821 Camera-mount UHF Wireless Microphone System (dual-channel)
with Body-pack Transmitters
Two ATW-T1801 UniPak™ Body-pack Transmitters
Two Omnidirectional Lavalier Microphones
ATW-1822 Camera-mount UHF Wireless Microphone System (dual-channel)
with Plug-on Transmitters
Two ATW-T1802 Plug-on Transmitters
ATW-1823 Camera-mount UHF Wireless Microphone System (dual-channel)
with Plug-on and Body-pack Transmitters
ATW-T1801 UniPak™ Body-pack Transmitter
ATW-T1802 Plug-on Transmitter
Omnidirectional Lavalier Microphone
System Features (Dual-Channel)
•Two completely independent receiver channels in a single unit, for
simultaneous operation of two microphones
•Extremely compact receiver is easy to mount on a camera with included
Velcro-type fastener
•UHF reception with 996 frequencies selectable in 25 kHz steps
•Automatic frequency scanning for easy selection of open channels
•Tone Lock™ squelch system eliminates interference when transmitter is
off (Transmitters are compatible with Advanced Digital Tone Lock™
squelch on Audio-Technica’s 3000 Series UHF Wireless Systems)
•Two independent balanced outputs (you can assign function of each,
independently)
•Headphone monitor output with independent level control
•Battery fuel-level indicators on transmitters and receiver
•Soft-touch controls for easy frequency selection

•True Diversity operation for resistance to multi-path interference and
dropouts
•LCD frequency and battery status display with backlight
•Antenna and AF Peak LED indicators
•Easy, user-friendly operation
•Clear, natural sound quality
•Powered by AA batteries
Quick Overview of System Operation
Thank you for purchasing this Audio-Technica 1800 Series Dual-channel Camera-mount UHF
Wireless Microphone System. All 1800 Series systems are designed primarily to be used with video
cameras, with the ATW-R1820 Dual-channel Receiver mounted on a camera and connected to the camera’s
audio input; they may also be used with other components equipped with microphone-level input(s).
This system is equipped with a dual receiver, which consists of two completely independent receiver
channels in a single unit, for simultaneous operation of two microphones.
First, insert batteries. (See Receiver Battery Installation, page __.) Note: The ATW-R1820 Dual-channel
Receiver also functions without batteries if connected to an external power supply (12V DC source, 500 mA
nominal current, not included).
Next, mount the ATW-R1820 Dual-channel Receiver to your camera using the included hook & loop fastener
mount or another accessory bracket (not included); or use the included pouch with belt clip to attach the
ATW-R1820 to your belt. Connect the output cable(s) to the ATW-R1820 and your video camera (and/or
audio mixer). (See Output A, Output B, and Output Select Switch callouts, page ___).
Turn the ATW-R1820 Power Switch on. Choose “1” to activate only Receiver Channel 1 (power/peak LED 1
should light red); this option will increase useable battery life. Choose “Both” to activate both receiver
channels (power/peak LEDs 1 and 2 should light red). (See Power Switch with four positions: External, Off,
1, Both callout, page ___.)
Select a frequency for Receiver Channel 1 and Receiver Channel 2. (See Selecting Frequencies on your
Dual-channel Receiver, page ___.)
NOTE: Receiver Channel 1 and Receiver Channel 2 must be set to different frequencies to avoid
interference. Transmitter-Receiver pairs must be set to identical frequencies: Set Transmitter 1 to
the same frequency as Receiver Channel 1; Set Transmitter 2 to the same frequency as Receiver
Channel 2.
IF your system is equipped with a UniPak Body-pack Transmitter and lavalier microphone: Plug the
included lavalier microphone(s) into the UniPak body-pack transmitter(s) and position microphone(s) on your
subject about six inches below the chin. Anticipate movements that may cause the microphone to rub
against or be covered by clothing, and position the microphone to avoid it. Turn the power on (see
Operating the Transmitter, page ___). Select a frequency and choose other settings. See Operating the
Transmitter and How to Set Frequencies on your Transmitter, page ___.)
IF your system is equipped with a Plug-on Transmitter: Attach a dynamic microphone or a condenser
microphone with an internal battery to the Plug-on Transmitter’s input connector (see Microphone Input,
page, ___). Turn the power on (see Operating the Transmitter, page ___). Select a frequency and choose
other settings. See Operating the Transmitter and How to Set Frequencies on your Transmitter, page ___.)

DUAL-CHANNEL RECEIVER CONTROLS
Front Panel:
LCD Liquid Crystal Display shows battery status and frequency settings. (Use the Dual-channel Control
Switch to select frequencies for Receiver Channel 1 and Receiver Channel 2; in Hold position, only
Receiver Channel 1 frequency appears in LCD.)
Antenna Input Jacks
BNC-type antenna connectors. Antennas A & B (split internally) both provide signals for Receiver
Channel 1 and Receiver Channel 2. Attach the antennas to the antenna input jacks. Make certain
that during operation there is a clear open-air path between the receiver antennas and the
transmitters.
Diversity Indicators for each antenna for each receiver
True Diversity operation: two antennas feed two completely independent RF sections on the same
frequency for each receiver; automatic logic circuitry selects the superior signal.
Diversity Indicator 1 indicates which tuner has the better reception and is in operation for Receiver
Channel 1; Diversity Indicator 2 indicates which tuner has the better reception and is in operation
for Receiver Channel 2.
Power Switch with four positions: External, Off, 1, Both
Turns the unit on and off.
Choose “External” (far left position), if the unit is connected to an external power supply (12V DC
source, 500 mA nominal current, not included). In “External” position, both receiver channels are
activated (indicated by illumination of power/peak LEDs 1 and 2).
Choose “Off” to turn the unit off.
Choose “1” to activate only a single receiver channel (Receiver Channel 1, indicated by the
illumination of power/peak LED 1). This conserves energy if you are only using one audio channel.
Choose “Both” to activate both receiver channels (indicated by illumination of power/peak LEDs 1
and 2).
Note: Selected receiver will be muted unless Dual-channel Control Switch (to right of Power
Switch) is in Hold position.
Power/Peak LED
Indicates which receiver channel(s) is (are) in operation. Also indicates receiver overload by
turning off; too much signal will cause blinking LED (off during peaks). To correct overload, adjust
audio gain on transmitter. (See ….)
Dual-channel Control Switch with three positions: 1, Hold, 2
This switch allows you to use the single LCD window to control each of the two receiver channels
separately.
To set frequency for Receiver Channel 1, switch to 1 (left position).
To set frequency for Receiver Channel 2, switch to 2 (right position).
To lock settings and operate unit, switch to Hold (center position).
Note: Receiver Channel 1 is muted when switch is at 1; Receiver Channel 2 is muted when switch
is at 2; both channels un-mute when switch is at Hold.
Dual-channel Control LED
This LED is red when switch is in position 1, indicating muted operation for Receiver Channel 1.

It is also red when switch is in position 2, indicating muted operation for Receiver Channel 2.
LED turns green in Hold position, indicating unit is ready for operation.
Set Use with the Dual-channel Control Switch and Up/Down arrows to choose operating frequencies
manually or automatically (using your choice of three automatic scan groups).
Up/Down Arrows
Press Up or Down arrows, in conjunction with the Set button, to choose operating frequencies
manually or automatically (using your choice of three automatic scan groups).
Rear Panel:
Output A
BALANCED AUDIO OUTPUT JACK: XLRM-type connector. Pin 1: ground (shield); Pin 2: “audio +”;
Pin 3: “audio –”. A standard 2-conductor shielded cable can be used to connect the receiver output
to a balanced microphone-level input on a camera, mixer or integrated amplifier.
Output B
BALANCED AUDIO OUTPUT JACK: XLRM-type connector. Pin 1: ground (shield); Pin 2: “audio +”;
Pin 3: “audio –”. A standard 2-conductor shielded cable can be used to connect the receiver output
to a balanced microphone-level input on a camera, mixer or integrated amplifier.
Output Select Switch
The rear panel provides two balanced XLR audio outputs (Outputs A & B). The unit is equipped
with an output select switch that assigns a signal to each of the audio outputs, as follows:
Output A (left) can be assigned either Receiver Channel 1 or MIX. (MIX = Ch. 1 and Ch. 2
signals mixed together. The relative levels of each signal can be adjusted using the
individual receiver level controls.)
Output B (right) can be assigned either Receiver Channel 1, Receiver Channel 2, or Mix.
Typical configuration: Output A is assigned Channel 1; Output B is assigned Channel 2, feeding
individual channels in a mixer or camera. Many other options are available, providing much
flexibility, for instance:
•If your camera doesn’t accept two inputs, you can sum the signal from both transmitters in
Output A and connect this mixed signal to your camera.
•You can connect Output A (mixed signal) to a camera, and Output B (mixed signal) to an
audio mixer
•When using the unit with a single transmitter (single-channel operation), Output A can be
used to feed a camera, while Output B can feed an audio mixer (both with identical signals
from Receiver Channel 1).
Receiver Level Controls [1and 2]
The signal levels of each receiver signal (Receiver Channel 1 and Receiver Channel 2) may be
adjusted using these controls. When the outputs are assigned to a single receiver signal, these controls will
adjust the output level. (Turn clockwise to increase output level.) When the outputs are assigned to MIX,
these controls adjust the relative levels between the receiver signals.
Monitor Select Switch
This switch assigns a signal to the Monitor headphone output.
•Choose 1[left position] to hear Channel 1 in both ears (mono signal, stereo output);
•Choose 2[right position] to hear Channel 2 in both ears (mono signal, stereo output);

•Choose Out [middle position], to hear Output A in the left ear, and Output B in the right
ear.
Monitor Level Control
The level control (volume control) for headphones is independent of other level controls. Turn to
the right to increase output (turn up the volume).
DC Input
You may connect the unit to an external power supply (12V DC source, 500 mA nominal current,
not included. In this case, move the Power Switch to the “External” position; both receiver channels
are activated (indicated by illumination of power/peak LEDs 1 and 2).
Monitor Output
¼” TRS jack.
Side Access:
Battery Selection
Each ATW-R1820 dual-channel receiver uses six 1.5V AA batteries, not included. Alkaline type is
recommended. Always replace all batteries. Make certain the receiver power is Off before replacing
batteries.
Note: The ATW-R1820 receiver also functions without batteries if connected to an external power
supply (12V DC source, 500 mA nominal current, not included).
Receiver Battery Installation
1. Open the battery compartment door by pushing the catch back
2. Observe correct polarity as marked and carefully insert six fresh 1.5V AA alkaline batteries
3. Replace the door, making certain the latch clicks securely in place.
Battery Condition Indicator
After the batteries are installed, turn the power on by moving the Power switch to either the 1 or
Both position. The small red power-on LED should light (red light at 1 if Power switch is in position
1; right light at 1 & 2 if Power switch is in Both position) and the LCD window should come on. If
this does not happen, the batteries are installed incorrectly or they are dead.
The receiver’s “fuel gauge” battery indicator displays a maximum of four bar segments. When
LCD flashes LOW.BAT, the batteries should be replaced immediately to ensure continued
operation.
Operating the Receiver
NOTE: Receiver Channel 1 and Receiver Channel 2 must be set to different frequencies to avoid
interference. Transmitter-Receiver pairs must be set to identical frequencies: Set Transmitter 1 to
the same frequency as Receiver Channel 1; Set Transmitter 2 to the same frequency as Receiver
Channel 2.
Selecting Frequencies on your Dual-channel Receiver
Overview…
1. Turn the power on by moving the Power switch to either the 1 position (for single-channel
operation) or Both position (for dual-channel operation).
2. Switch the Dual-channel Control Switch to 1 (to set frequency for Receiver Channel 1) or
2 (to set frequency for Receiver Channel 2). Audio output is muted for the channel that is
selected.
3. Press the Set button to enter the Frequency Selection Menu mode; the world “Menu” will
appear.

4. Use the Up/Down arrows to cycle through functions:
•First arrow up is Manual Frequency Selection Mode;
•second arrow up is Automatic Scan Group 1;
•third arrow up is Automatic Scan Group 2;
•fourth arrow up is Automatic Scan Group 3;
•fifth arrow up is Quit, allowing exit from “Menu” mode.
Dual-channel operation (using two transmitters)
Setting Receiver Frequency Manually
First…
Turn the power on by moving the Power switch to Both (for dual-channel operation). To
set frequency for Receiver Channel 1, switch Dual-channel Control Switch to 1 (left
position).
1. Press Set button. The word “MENU” will appear. Press Up arrow to show current
frequency. Press Set button and frequency will begin to flash; then use up and down
arrows to adjust the frequency. Frequency changes in 25k steps. To increase scroll
speed, hold the up or down arrow for more than 4 seconds.
2. When you arrive at desired frequency, press and hold the Set button until the word
“Stored” appears. Frequency is now set.
3. To “back out” of the Manual Frequency Set mode without making a frequency choice,
simply press the Set button once to exit the menu and return the receiver to normal
operation. The word “ESCAPE” will appear in the window, and no changes in frequency
setting will be made; the receiver’s audio output will again be enabled (when Dual-channel
Control Switch is returned to Hold position).
To set frequency for Receiver Channel 2, switch Dual-channel Control Switch to 2 (right position).
Repeat steps 1-2 above.
To lock settings and operate unit, switch Dual-channel Control Switch to Hold (center position).
Note: While Channel Selection mode is still active, if the Dual-channel Control Switch is moved
back to Hold position before channel selection is complete, LED will remain red and audio will
remain muted until the control sequence is completed.
Using the Automatic Scan Function to Set Receiver Frequency (dual-
channel operation)
First…
Turn the power on by moving the Power switch to Both (for dual-channel operation). Then
switch Dual-channel Control Switch to 1 (left position).
1. Press the Set button to enter the Frequency Selection Menu mode; the world “Menu” will
appear.
2. Use the Up or Down arrow to reach Scan 1, Scan 2, or Scan 3. Press the Set button once
to select one of these three Scan groups. The word “SCAN1”, “SCAN2” or “SCAN3” will
flash in the LCD window.
3. Press the Up or Down arrow to begin the scan. Press the Up arrow to scan up from
the lowest frequency in the group; press the Down arrow to scan down from the
highest frequency in the group.
4. The first available frequency will flash in the LCD window. To activate this frequency
selection, press and hold the Set button until the word “STORED” appears in the LCD
window.

5. If you do not wish to use the frequency found, you may press the Up or Down arrow. The
Up arrow with scan upwards, the Down arrow will scan downwards, from the frequency
you are on.
6. To set frequency for Receiver Channel 2 (for dual-channel operation), switch Dual-
channel Control Switch to 2 (right position). Repeat steps 1-4 above. Note: Be certain to
select the same Scan Group than you used for Receiver Channel 1.
7. To lock settings and operate unit in dual-channel operation (using two transmitters),
switch Dual-channel Control Switch to Hold (center position). The receiver will return to
normal operation, audio function will be restored and the Dual-channel Control LED
indictor will turn green.
8. If you are using multiple systems, after completing the first receiver's scan and frequency
selection, set its transmitter to the same frequency (see Setting Transmitter Frequency
instructions on page ); leave the transmitter On, and run the next receiver’s automatic
scan function. Always set a receiver-transmitter pair to the same frequency before using
the automatic scan function to select a frequency for the next receiver.
In the event that no more free frequencies are available within the scan group, the
receiver will indicate “END” on the receiver display. In this case, the user should select a
different scan group for both Receiver Channels 1 and 2 and re-scan.
Note: While Channel Selection mode is still active, if the Dual-channel Control Switch is moved
back to Hold position before channel selection is complete, LED will remain red and audio will
remain muted until the control sequence is completed.
Single-channel operation
Setting Receiver Frequency Manually (for single-channel operation)
First…
Turn the power on by moving the Power switch to the 1 position (for single-channel operation).
Switch Dual-channel Control Switch to 1 (left position). Output from Receiver Channel 1 is now
muted.
1. Press Set button. The word “MENU” will appear. Press Up arrow to show current
frequency. Press Set button and frequency will begin to flash; use up and down arrows to
adjust the frequency. Frequency changes in 25k steps. To increase scroll speed, hold
the up or down arrow for more than 4 seconds.
2. When you arrive at desired frequency, press and hold the Set button until the word
“Stored” appears. Frequency (which appears on the screen) is now set.
3. To “back out” of the Manual Frequency Set mode without making a frequency choice,
simply press the Set button once to exit the menu and return the receiver to normal
operation. The word “ESCAPE” will appear in the window, and no changes in frequency
setting will be made; the receiver’s audio output will again be enabled.
To lock settings, un-mute and operate the unit, switch Dual-channel Control Switch to Hold (center
position).
Using the Automatic Scan Function to Set Receiver Frequency
Automatically (for single-channel operation)
First…
Turn the power on by moving the Power switch to 1 (for single-channel operation). Then
switch Dual-channel Control Switch to 1 (left position).
1. Press the Set button to enter the Frequency Selection Menu mode; the world “Menu” will
appear.

2. Use the Up or Down arrow to reach Scan 1, Scan 2, or Scan 3. Press the Set button once
to select one of these three Scan groups. The word “SCAN1”, “SCAN2” or “SCAN3” will
flash in the LCD window.
3. Press the Up or Down arrow button to begin the scan. Press the Up arrow to scan up
from the lowest frequency in the group; press the Down arrow to scan down from
the highest frequency in the group
4. The first available frequency will flash in the LCD window. To activate this frequency
selection, press and hold the Set button until the word “STORED” appears in the LCD
window.
5. If you do not wish to use the frequency found, you may press the Up or Down arrow. The
Up arrow with scan upwards, the Down arrow will scan downwards, from the frequency
you are on.
6. To lock settings and operate unit in single-channel operation (using one transmitter),
switch Dual-channel Control Switch to Hold (center position). The receiver will return to
normal operation, audio function will be restored and the Dual-channel Control LED
indictor will turn green.
ATW-T1801 UniPak™ Body-pack Transmitter &
ATW-T1802 Plug-on Transmitter Controls
Antenna
The ATW-T1801 UniPak™ Body-pack Transmitter includes a field-replaceable 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 or try
repositioning the receiver. Since the transmitter antenna simply screws in, check to make certain it
is snugly attached (finger-tight). Do not change the length of the transmitting antenna.
Power-on LED
Green light indicates power is on and un-muted; red light indicates that audio is muted.
LCD Window
The Liquid Crystal Display presents setup and operating information clearly and conveniently). The
LCD in the transmitters is designed for greatest contrast and best viewing with the window rotated
somewhat away from the viewer (about 30 degrees), not straight-on, for a more convenient
holding/viewing position. The display is illuminated with a backlight when you press Set to access
transmitter functions. The backlight will automatically turn off within a set period of time.
Audio Input Jack
Connect an audio input device (microphone or guitar cable) to the audio input jack on the bottom of
the ATW-T1801 UniPak™ Body-pack Transmitter. A number of Audio-Technica professional
microphones and cables are available separately, pre-terminated with a UniPak input connector
(see “Optional System Accessories” ). The cable connector latches automatically when inserted
into the transmitter jack. To unlatch and remove the connector, pull up on the connector’s knurled
metal collar.
Microphone Input
The ATW-T1802 Plug-on Transmitter has a 3-pin XLRF-type input connector with a locking
collar. Use a dynamic microphone, or a condenser mic with an internal battery. To attach the
microphone, rotate the threaded locking collar fully clockwise (“down”) until it reaches the
transmitter housing. Then rotate the collar back “up” one or two turns to expose the microphone
latch. Press the microphone and transmitter together , making certain that the latch “clicks” into the
base of the mic. Pull on the mic to make certain it is latched on the connector. Continue to rotate

the threaded collar “up” until it is firmly against the end of the mic. Make certain the mic is securely
attached before use. To detach the microphone, reverse the steps above. Always loosen the
threaded collar fully before attempting to disconnect the mic.
Power/Mute Button
For on/off and mute functions.
Up/Down Arrows
Press Up or Down arrows, in conjunction with the Set button, to choose operating frequencies and
access transmitter functions.
Set Button
Press Up or Down arrows, in conjunction with the Set button, to choose operating frequencies and
access transmitter functions.
Sliding Control Cover (3-position)
This 3-position sliding cover on the transmitter’s control panel prevents accidental shut-
off or channel-switching.
Sliding Control Cover
This sliding cover on the transmitter’s control panel helps to prevent accidental shut-off or
channel-switching.
Battery Door
Open by sliding the catch down.
Mounting Clip
The UniPak transmitter’s mounting clip may be installed with the case positioned either “up” or
“down,” depending upon which is preferred for the application. To turn the clip around, spring the
ends of the clip out of the two holes on the sides of the transmitter case (Fig. E) and reinstall it
facing in the opposite direction.
Transmitter Batteries
Battery Selection
Each transmitter uses two 1.5V AA batteries, not included. Alkaline type is recommended. Always
replace both batteries. Make certain the transmitter power is Off before replacing batteries.
Transmitter Battery Installation
1. Open the battery compartment door by sliding the catch down .
2. Observe correct polarity as marked on the metal contacts on the door and carefully insert
two fresh 1.5V AA alkaline batteries .
3. Close the door, making certain the latch clicks securely in place.
Battery Condition Indicator
After the batteries are installed, turn the power on by pressing and holding the Power/Mute button.
The small power-on LED should light green and the LCD window should come on. If this does not
happen, the batteries are installed incorrectly or they are dead. The transmitter’s “fuel gauge”
battery indicator displays a maximum of four bar segments. When it flashes “LOW.BAT”, the
batteries should be replaced immediately to ensure continued operation. (The receiver also
displays transmitter battery condition in the LCD window with bar segments; the Alert indicator
comes on to warn of a low-battery condition.)
Operating the Transmitter

Turning your Transmitter On & Off
To turn the transmitter on, press and hold the Power/Mute button until the power indicator lights
green, and the LCD window comes on (about 1-2 seconds). The operating frequency will show in
the window after the power-up sequence.
To turn the transmitter off, press and hold the Power/Mute button again, until the power indicator
and the LCD window are extinguished (about 1-2 seconds). The LCD window will show
“PWR.OFF” before shutdown.
How to Set Frequencies on your Transmitter
NOTE: Transmitter-Receiver pairs must be set to identical frequencies: Set Transmitter 1 to the
same frequency as Receiver Channel 1; Set Transmitter 2 to the same frequency as Receiver
Channel 2.
1. Turn transmitter on.
2. Press the Set button once and the small word “MENU” will appear above the frequency.
3. Press the Set button again and the small flashing word “EDIT” will appear to the right of “MENU”.
4. Use the Up/Down arrows to change the transmitter frequency. Press either arrow for 25 kHz steps,
or hold down either arrow for rapid cycling through the range. Frequencies “wrap around” when the
top or bottom of the band is reached. Select the exact frequency displayed on the receiver.
5. To activate this frequency selection, press and hold the Set button until the word “STORED”
appears in the transmitter’s window. (If you do not wish to complete this selection, just press the
Set button once: the word “ESCAPE” will appear briefly in the window and the transmitter will return
to the Menu mode.)
6. When finished entering a frequency, press the Up arrow once to move to “QUIT”. Then press the
Set button once to exit the menu. The word “MENU” in the transmitter window will go off, indicating
the return to normal operation.
How to Access & Use the Function Menu on your Transmitter
1. Turn transmitter on.
2. Press the Set button once; the small word “MENU” will appear above the frequency.
3. When in the Menu mode, use the Up and Down arrows to cycle through the following functions:
•Frequency
•RF Power
•Audio Input Level
•Power/Mute Locks
•Input Select
•Reset to Defaults
•Quit (exit menu)
4. To make a change in the default setting:
Press Set button once;
Press Up or Down arrow until you reach desired setting;
Press and hold Set button until the word “Stored” appears in the LCD window.
(If you do not wish to complete this selection, just press the Set button once: the word
“ESCAPE” will appear briefly in the window and the transmitter will return to the Menu mode.)
Transmitter Functions
Function Menu Default Setting Choices (Edit) ▲▼ Wrap-around*
▲▼ Frequency Lowest in band 996 frequencies (25 kHz steps) Yes
▲▼ RF Power RF LOW RF LOW RF HI Yes
▲▼ Audio Input Level +6 dB -6 dB 0 dB +6 dB +12 dB No
▲▼ Power/Mute Locks NO. LOC NO. LOC ALL.LOC MUT.LOC. PWR.LOC Yes
▲▼ Input Select** MIC MIC INST Yes
▲▼ Reset to Defaults PRESET LOAD (b) hold until: DEF (c) hold until: LOADED -
▲▼ Quit QUIT Press Set to exit -
**on UniPak Transmitter only
RF Power Adjustments on your Transmitter

RF power may be set to “RF HI” (30 mW nominal) or “RF LOW” (10 mW nominal) through the
function menu. The default setting is “RF LOW”. While the High setting normally provides maximum
operating range, the Low setting will help extend battery life. The Low setting may also be preferred
in multichannel systems, or when operating very close to the receiver, to reduce the possibility of
interference or overload.
Audio Input Level (Gain) Adjustments on your Transmitter
Correct adjustment of transmitter audio input, receiver audio output, and mixer/amplifier input and
output levels is important for best performance.
A 4-position audio input gain setting, selected through the function menu, allows you to match the
audio input level to the transmitter for best modulation with minimum distortion. The choices are
+12 dB, +6 dB, 0 dB and –6 dB. The default value is +6 dB. Select the highest setting that does not
result in over-modulation with the highest audio/instrument input levels (an AF indication on the
receiver no higher than “0”).
Using the Mute and Un-Mute Functions on your Transmitter
When the transmitter is muted, it produces RF with no audio. When the transmitter is un-muted, it
produces both RF and audio. To mute the transmitter (cut off the audio, but continue the RF
output), press and release the Power/Mute button once. A small “MUTE” will appear in the LCD
window, just below the frequency. To un-mute the transmitter (restore the audio), press and
release the Power/Mute button once again. The “MUTE” will disappear from the LCD window.
Power/Mute Locks
The Power/Mute Button can be programmed (through the function menu): power can be locked On;
Mute can be locked either On or Off.
Setting Description
NO.LOC The Power and Mute functions operate normally.
ALL.LOC Both the Power and Mute functions are locked into their status as of the
time “ALL.LOC” is applied. (Power On, and Mute either On or Off.) Note:
ALL.LOC must be re-accessed and the setting changed to turn the
transmitter off.
MUT.LOC In this mode, the audio cannot be muted. The Power functioning is
unaffected. (If MUT.LOC is applied while the transmitter is muted,
pressing the Power/Mute button once will return to un-muted operation;
thereafter the Mute function is disabled until the setting is changed
again.)
Audio Input Selector
The UniPak™ body-pack transmitter provides input connections for both low-impedance (Lo-Z)
microphones and high-impedance (Hi-Z) instruments. A wide range of Audio-Technica Wireless
Essentials™ microphones and cables are available pre-terminated with the appropriate
professional latching connector.
Select the desired input – microphone or instrument –through the function menu; a small “MIC” or
“INST” will show in the LCD window, just below the frequency.
Restore Default Settings
1. A “PRESET” selection in the menu allows you to reset all transmitter functions to their factory-
default values.
2. Press the Set button once to move to Menu mode.
3. Press the Up arrow twice to move to “PRESET” in the LCD window.
4. Press the Set button once and “LOAD” will appear in the LCD.
5. Press and hold the Set button until “DEF” appears in the LCD.
6. Press and hold the Set button until “LOADED” appears briefly in the LCD. The window will then
revert to “PRESET”.
7. Press the Down arrow once to move to “QUIT”.
8. Press the Set button once to exit the Menu mode and return to normal operation, with all
factory-default settings restored.
About 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 in the band. If any interference is received by any
Government or non-Government operation, the wireless microphone must cease operation...”
If you need help with operation or frequency selection, please contact your dealer or the Audio-
Technica professional division. Extensive wireless information also is available at www.audio-
technica.com.
Tips for best results
1. Use only fresh alkaline batteries; replace the receiver batteries in pairs. Do not use “general
purpose” (carbonzinc) batteries.
2. Position the dual-channel receiver so that it has the fewest possible obstructions between it
and the normal location of the transmitters. Line-of-sight is best.

3. The transmitters and the dual-channel receiver should be as close together as conveniently
possible, but no closer together than three feet.
4. The receiver antennas should be in the open and away from any metal.
5. Each transmitter-receiver pair must be set to the same frequency.
6. Only one transmitter on a given frequency should be “on” at a time.
7. The power switch on the transmitter has four positions: “Ext.,” “Off,” and “1” and “Both.”
8. If the “Out Level” of either receiver channel is set too high, it may over-drive the input of the
camera/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.
9. You need to change channels 1) when a strong interference signal is received, 2) when the
channel breaks down, or 3) during multiple-system operation in order to select an interference-
free channel. Always turn the units off before changing frequencies.
10. Turn the receiver and transmitter off when not in use. Remove the batteries during long-term
storage.
WIRELESS ESSENTIALS™ MICROPHONES AND CABLES
All Wireless Essentials accessories are terminated for use with UniPak™
transmitters.
AT829cW Miniature cardioid condenser lavalier microphone. Includes clothing
clip and windscreen.
MT830cW Miniature omnidirectional condenser lavalier microphone. Includes
clothing clip and windscreen.
MT830cW-TH “Theater” model, same as MT830cW except beige color mic and
cable.
AT831cW Miniature cardioid condenser lavalier microphone. Includes clothing
clip and windscreen.
AT889cW Headworn noise-canceling condenser microphone. Includes
windscreen and cable clip.
AT892cW MicroSet® headworn omnidirectional condenser microphone. Includes
element covers, windscreens, moisture guard and clothing clip.
AT892cW-CO Same as AT892cW except cocoa-color mic, earset and cable.
AT892cW-TH “Theater” model, same as AT892cW except beige color mic,
earset and cable.
AT898cW Subminiature cardioid condenser lavalier microphone. Includes
clothing clip base, viper clip base, magnet clip base,
three single mic holders, two double mic holders and two windscreens.
AT899cW Subminiature omnidirectional condenser lavalier microphone. Includes
AT899AK accessory kit.
AT899cW-TH “Theater” model, same as AT899cW except beige color mic and
cable. Includes AT899AK-TH accessory kit.
ATM350cW Cardioid condenser instrument microphone. Includes AT8418 clip-
on instrument mount.
ATM73cW Headworn cardioid condenser microphone. Includes windscreen.
ATM75cW Headworn cardioid condenser microphone. Includes windscreen.
PRO8HEcW Headworn hypercardioid dynamic microphone. Includes windscreen
and cable clip.
PRO35cW Cardioid condenser instrument microphone. Includes AT8418 clip-on
instrument mount.

U851cW Surface-mount wide-range hemi-cardioid condenser microphone.
U857ALcW Gooseneck cardioid microphone. Mounts to 5/8"-27 thread. Includes
AT8663 A-mount flange, AT8664 A-mount cable pass-through adapter, AT8153
two-stage windscreen
AT-GCW Hi-Z instrument/guitar cable with 1/4" phone plug.
XLRW Connecting cable for UniPak transmitter with an XLRF-type input
connector, for Lo-Z microphones with XLRM-type
output terminations.
RECEIVER ACCESSORIES
RF Cables Low-loss design, 50 ohm impedance, with BNC-to-BNC connectors:
AC12 RG58-type cable (12')
AC25 RG8-type cable (25')
AC50 RG8-type cable (50')
AC100 RG8-type cable (100')
TRANSMITTER ACCESSORIES
ATW-RMS1 Remote mute switch designed to be installed between a wireless
microphone using an HRS-type connector and its associated body-pack wireless
transmitter. Includes permanently attached 22" cable and belt clip.
ATW-RCS1 Remote momentary-mute/cough switch designed to be installed
between a wireless microphone using an HRS-type connector and its associated
body-pack wireless transmitter. Includes permanently attached 22" cable and belt
clip.
For future reference, please record your system information here:
Receiver ATW-R1820C Serial Number __ __ __ __ __ __ __
ATW-R1820D Serial Number __ __ __ __ __ __ __
Transmitter ATW-T1801 UniPak™ Serial Number __ __ __ __ __ __ __
ATW-T1801 UniPak™ Serial Number __ __ __ __ __ __ __
ATW-T1802 Plug-on Serial Number __ __ __ __ __ __ __
ATW-T1802 Plug-on Serial Number __ __ __ __ __ __ __
Specifications