O w n e r ’ s M a n u a l
DKW-8U
single Channel uHF
wireless system
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System Features
DKw-8u receiver
HT-8u Handheld
Microphone Transmitter
• Unprecedented value in a single-channel
UHF wireless mic/instrument system
with interference-free operation in any
application or locale on select UHF
frequencies on separate bands,
• Features the Nady DM -10D unidirectional
neodymium dynamic cartridge for
optimum true sound, maximum feedback
rejection and minimal handling noise
902-928MHz and 944-952MHz
• OFF/STANDBY/ON switch allows
convenient audio muting while
transmitter “ON”
• Compact, simple set up to operate—
simply plug in instead of your wired
microphones or instrument cable
• Status LED indicator flashes once for unit
• All the advantages and freedom
of wireless operation without
cumbersome cords
“ON”; lights steady for low battery alert
• Two AA alkaline or NiMH battery operation
• Excellent high fidelity audio—perfect
for public speaking, karaoke/recreational
singers, guitarists, DJ’s, and many other
applications
BT-8u Bodypack Transmitter
• Choice of instrument (GT)/headworn(HM)/
lavalier(LT) microphone operating modes
in a single bodypack transmitter
• Nady’s proprietary companding circuitry
for an industry best 120dB Dynamic
Range, and the clearest, most natural
sound available
• OFF/STANDBY/ON switch allows
convenient audio muting while
transmitter “ON”
• Status LED indicator flashes once for unit
“ON”; lights steady for low battery alert
• 150+ feet typical operating range—
up to 300+ feet line-of-sight
• Locking 3.5mm mini-jack provides secure
connection for removable microphone or
instrument cable
• POWER, SIGNAL, AF LED status
indicators, adjustable audio output level for
optimal sound and 1⁄4” phone jack output
for easy connection to sound system
• Easily accessible input level adjust
control for optimum sound (HM/LT
operating modes only)
• Externally powered by DC power
adapter (included)
• Single 9V alkaline or NiMH
battery operation
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DKW-8U Receiver
Microphone Connection
1. receiver Placement
This unit is designed for desktop use
and can be placed on any flat surface
that is secure. Do not place, however, on
amplifiers or other equipment that can get
hot in operation. This unit is not designed
for rackmounting.
(Using the HT-8U handheld microphone
or the BT-8U transmitter with either
a headworn or lavalier microphone
transmitter)
For microphone use, the 1/4” line level
auDIO OuT can be used. Plug one end of a
1/4” audio cable into the auDIO OuT JaCK
(6) located in the back of the receiver. Plug
the other audio cable end to you mixing
board input. Make sure the phantom power
on your mixing board is turned off and
the volume in turned down when making
the audio connections. Start the receiver
VOluMe (7) at MINIMUM and adjust until
the volume level is optimal.
2. Powering the receiver
Plug the 14V/0.4a DC aDaPTer (1) provided
into the DC In jack (2) on the back of the
receiver. Then plug the power supply into
an AC outlet. The POwer leD (3) will now
light and the receiver is operational.
3. antenna
The DKW-8U receiver is supplied with an
attached FOlDInG anTenna (4). This should
be extended fully to obtain maximum range.
Optimal antenna position is 45 degrees
from the receiver. For maximum range, it
is always best to maintain a line of sight
(no obstructions) between the receiver
and the transmitter antenna at all times
whenever possible.
Instrument Connection
To use the 1/4” line level auDIO OuT JaCK (6)
for instrument use, follow the instructions
for the Microphone Connection (above),
except start the receiver VOluMe (7) at
1/2 MAX and adjust until the volume level
is optimal.
(Note: 1:1 with a directly connected cord from the
instrument to the amp is with the volume about
3/4 MAX, and MAX volume from the receiver
will be about 4dB higher than 1:1. If the volume
control is set too high, you may overload your
mixer or amp.)
4. Mute (squelch)
The DKW-8U has a preset mute (Squelch)
internally for maximum range and
performance. There is no need to adjust
this. In normal operation, the sIGnal leD
(5) should be lit when the transmitter is
transmitted. However, when the signal LED
extinguishes, the transmitter is out of range
for that given location, and the user should
move closer to the receiver to re-establish
the radio link.
6. aF leD Display
The DKW-8U receiver is equipped with an
aF leD DIsPlaY (8). The LED lights whenever
an audio signal is being transmitted from
the transmitter.
(Note: The AF LED Display is not a peak level
indicator so it can light continuously during audio
signal input to the transmitter.)
5. Connecting the audio Output
The DKW-8U receiver provides with an
adjustable 1⁄4” line level auDIO OuT jack (6).
(Note: As when making any connection, make
sure the amplifier or mixing board volume is at the
minimum level before plugging in the receiver to
avoid possible sound system damage.)
4
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4
5
3
7
8
2
6
1
5
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HT-8U Handheld Mic Transmitter
1. Release the BaTTerY COVer (9) by
pressing the locking tab and slide down
as per the arrow, exposing the BaTTerY
HOlDer (10). Insert two fresh AA alkaline
or NiMH batteries, observing the correct
polarity as marked, and slide the battery
cover back on to the microphone. Make
sure the cover is closed completely. Fresh
alkaline batteries can last up to 10 hours
in use, but in order to ensure optimum
performance, it is recommended that you
replace the battery after every 6-8 hours
of use. NiMH batteries should be replaced
with fresh ones recharged fully (with
separate charger, not supplied, and as per
its charging instructions) whenever low or
dead battery status is indicated as per the
following.
both on). The BaTTerY InDICaTOr leD (12)
will give a single quick flash, indicating
usable battery strength. In the case of a
dead or low battery, the LED will either not
go on at all or will stay on continuously,
indicating that the batteries should be
replaced with fresh ones. To preserve
battery life, turn the transmitter off when
not in use.
3. The microphone is now ready to use.
The sIGnal leD (5) on the DKW-8U receiver
should now be lit, indicating a received
signal from the transmitter. When ready to
speak, slide the OFF/sTanDBY/On swITCH
(11) to the ON position. Adjust the volume
of the receiver as per the Connecting
the Audio Output of the above DKW-8U
receiver instructions.
2. Turn on the HT-8U by sliding the OFF/
sTanDBY/On swITCH (11) to the STANDBY
position first (transmitter on, audio muted)
or the ON position (transmitter and audio
[Note: Observe care in selecting P.A. volume,
transmitter location and speaker placement so
that acoustic feedback (howling or screeching)
will be avoided.]
Back
9
10
Front
11
12
6
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BT-8U Bodypack Mic Transmitter
1. Snap open the BaTTerY DOOr (13) and
insert a fresh 9V alkaline or NiMH battery
into the BaTTerY COMParTMenT (14)
selected. To secure the connection, turn the
slip ring on the plug clock wise to thread it
on the jack. To unplug, reverse the process.
Slip the transmitter into a pocket or ClIP
(20) it on to your clothes or instrument
strap (if using the BT-8U as an instrument
transmitter).
observing the correct polarity. Close the
battery door to its original position and
completely cover the battery. Fresh alkaline
batteries can last up to 10 hours in use, but
in order to ensure optimum performance,
it is recommended that the battery be
replaced after 6-8 hours of use. A NiMH
battery should be replaced with another
recharged fully (with separate charger,
not supplied, and as per its charging
4. Turn on the BT-8U by sliding the OFF/
sTanDBY/On swITCH (21) to the STANDBY
position (transmitter on, audio muted) or
the ON position (transmitter and audio both
on). The BaTTerY InDICaTOr leD (22) will
give a single quick flash, indicating usable
battery strength. In the case of a dead or
low battery, the LED either will not go on
at all or will stay on continuously, indicating
instructions) whenever low or dead battery
status is indicated as per the following.
2. Selecting audio Input Operating Mode: The
BT-8U is equipped with two InPuT seleCTOr that the battery should be replaced with a
swITCHes (15) located under the cover on
the circuit board for selecting the type of
audio input you will be supplying to the
transmitter. Select from the choice of three
positions: INSTRUMENT (for guitar, bass,
etc.), HEADWORN MIC, and LAVALIER
MIC (Condenser Microphones).
fresh one. To conserve battery life, turn unit
off when not in use.
5. The BT-8U transmitter is now ready
to use. The sIGnal leD (5) on the DKW-
8U receiver should now be lit, indicating
a received signal from the transmitter.
Adjust the volume of the receiver as per the
Connecting the Audio Output of the above
DKW-8U receiver instructions.
(Note: Use only the input audio source as per the
input selected with the internal AUDIO INPUT
SELECTOR SWITCHES (15) or the audio will
not be optimal–a muddy or distorted sound
may result.)
6. Instrument use: Secure the connection
from the GT CaBle (17) by turning the
slip ring on the plug into the transmitter
clockwise to thread it on the jack. To
There are two switches with selectable
positions GT, HM, LT together at the
same time.
unplug, reverse the process. Plug the 1/4”
phone plug into the instrument. When
ready to play, slide the audio OFF/sTanDBY/
On swITCH (21) to either “STANDBY or ON”
position. Adjust the volume of the receiver
as per the Connecting the Audio Output of
the above DKW-8U receiver instructions.
To select inputs: (see chart on page 9)
a. Instrument: Set both switches to GT
B. Headworn Mic: Set both switches to HM
C. lavalier Mic: Set both switches to LT
3. Connecting for selected Input: The BT-8U
is provided with a 3.5 mm lOCKInG JaCK
(16) for connecting the audio input selected.
Connect either the InsTruMenT COrD (17)
or the HeaDwOrn MIC (18) or laValIer MIC
COrD (19) as desired, according to the input
(Note: The INPUT LEVEL CONTROL (23) is deactivated
and not used when the BT-8U is in INSTRUMENT
(GT) mode. Levels should be adjusted with the
volume control of your instrument.)
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(Note: Scratchy noises can sometimes occur
when some electric guitars with dirty pots or
connections are used with any wireless system.
Therefore, the supplied INSTRUMENT CORD (17)
has a factory-installed capacitor inside the 1/4”
plug. This capacitor provides first order filtering
of the RF signal from the cord into the guitar and
eliminates virtually all scratchy noises. Should
your equipment still give you scratchy noises, we
suggest these steps to eliminate them:
[Note: Observe care in selecting P.A. volume,
transmitter location and speaker placement so
that acoustic feedback (howling and screeching)
will be avoided. Please also note the pickup
pattern characteristics of the microphone
selected. Omnidirectional mics pick up sound
equally from all directions, and are prone to
feedback if not used carefully. Unidirectional mics
are more resistant to feedback, but pick up sound
sources best that are directly in front of the mic.
Also, mics that are farther from the sound source,
such as lavalieres, require more acoustic gain
and thus are also more prone to feedback than
close-source mics such as handheld or headworn
models that are used close to the mouth].
1) Make sure all guitar volume and tone
pots are clean and all contacts are solid–this
is very important.
2) A 47pf capacitor soldered across the hot
to ground terminals of the guitar’s volume
and tone pots will provide extra filtering.)
8. For optimum performance, an InPuT
leVel COnTrOl (23) is provided. Adjust the
gain by turning the control with a small
screw driver. For lavalier mic use, it is
recommended that the level be set at about
1/2 maximum. For headworn mic use, it
may be advisable to turn the gain down
somewhat, depending on the volume levels
expected. In either application, experiment
and set for maximum possible gain without
audible distortion on the high level peaks.
7. Microphone use (with either a lavalier
or headworn microphone): Secure the
connection from the laValIer (18) or
HeaDwOrn MIC COrD (19) by turning the
slip ring on the plug into the transmitter
clockwise to thread it on to the jack. To
unplug, reverse the process. To use the
lavalier mic, attach it at chest level. Do not
place it too close to the mouth–a distance
of about six inches usually works best.
To use the headworn mic, place it on the
head and adjust the boom so that the mic
is about one inch to the side of the front of
the mouth. When ready to speak, slide the
OFF/sTanDBY/On swITCH (21) to the either
“STANDBY or ON” position.
(Note: Turning down the gain too much can
compromise the signal-to-noise and it is not
recommended.)
9. The DKW-8U receiver is equipped
with an aF leD DIsPlaY (8). The LED
lights whenever an audio signal is being
transmitted from the transmitter.
(Note: The AF LED Display is not a peak level
indicator so it can light continuously during
audio signal input to the transmitter.)
Adjust the volume of the receiver as per
the Connecting the Audio Output above
DKW-8U receiver instruction.
8
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INPUT SELECTOR
SWITCHES
HL
13
Instrument
G
G
G
H
H
H
L
L
L
G
23
24
HL
Headworn
Lavalier
22
G
HL
21
G
20
15
14
17
18
19
9
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Specifications
DKw-8u OVerall sYsTeM PerFOrManCe
Frequency response
Dynamic range
50 Hz - 16 KHz, - 3 dB
120 dB
Total Harmonic Distortion
rF Carrier Frequency range
<1%
UHF, choice of single frequencies on separate bands,
902-928MHz and 944-952MHz
+/- 0.005%, crystal controlled
FM +/-20KHz normal
Frequency stability
Modulation
Operating range
Up to 250 ft. typical (depending on site conditions);
up to 500+ feet optimum line-of-sight
reCeIVer
reception Mode
squelch
Mono antenna reception
Fixed
Controls
Volume Control
Connectors
DC In: (2.1mm barrel), Unbalanced Out :1/4” (6.3mm) jack
Power ON, Signal, AF LEDs
60dB image and spurious
DC 14V @ 400 mA, DC adapter included
6.88” x 4.0” x 1.5” (17.5 x 10.2 x 3.8 cm)
7.6 oz (0.22 kg)
leD Indicators
unwanted signal rejection
Power requirements
Dimensions (Max.)
weight
antenna
4” (9.5 cm), Single section telescopic
TransMITTers
audio Inputs
BT-8u Bodypack
3.5mm locking mini-jack, internally switchable inputs:
instrument, headworn mic, or lavalier mic
HT-8u Handheld
Controls
Integral Nady DM-10D neodymium dynamic cartridge
BT-8u
ON/STANDBY/OFF, INPUT LEVEL CONTROL,
internal GT/HM/LT switches
HT-8u
ON/STANDBY/OFF
rF Power Out
Harmonic and spurs
antennas HT-8u/BT-8u
Indicators HT-8u/BT-8u
Battery
20mW normal (50mW Maximum allowed by FCC)
< -50 dB
Internal antennas
Single LED, flash once “ON”, LOW BAT “Steady ON”
HT-8u
BT-8u
Battery life
2xAA Alkaline or NiMH batteries
Single 9V Alkaline or NiMH battery
8-10 Hours (Alkaline)
Dimensions
BT-8u Bodypack
HT-8u Handheld
weight
4.25” x 2.5”x 1.0” (10.8 cm x 6.4 cm x 2.5 cm)
10.5”x 1.875” (26.7 cm x 4.8 cm)
BT-8u Bodypack
HT-8u Handheld
3.1 oz (88 g) without battery
7.5 oz (213 g) without battery
Specifications subject to change at any time without prior notice for purposes of product improvement
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One Year Limited Warranty
Nady Systems, Inc. warrants to the original consumer purchaser (U.S.A. only) that the unit is free from
any defects in material or workmanship for a period of one year from the date of original retail purchase.
If any such defect is discovered within the warranty period, Nady Systems, Inc. will repair or replace the
unit free of charge, subject to verification of the defect or malfunction upon return to Nady Systems.
Please do not return your Nady product to the store where it was purchased as Nady Systems handles
your warranty service directly. Communication with our Service Department is the most efficient means
of servicing your unit and we are dedicated to keeping you a satisfied customer.
To the extent permitted by law, any applicable implied warranties, including warranties of merchantability
and fitness are hereby limited to one year from the date of purchase. Consequential or incidental
damages resulting from a breach of any applicable express or implied warranties are hereby excluded.
This warranty is in lieu of all other agreements and warranties, general or special, express or implied
and no representative or person including a Nady dealer, agent, or employee is authorized to assume
for us any other liability in connection with the sale or use of this Nady Systems’ product.
Whereas some states do not allow limitations on how long implied warranties last, and do not allow
exclusion of incidental or consequential damages, the above limitations and exclusions may not apply
to you. This warranty gives you specific legal rights and you may also have other rights which may vary
from state to state.
This warranty is subject to the following conditions:
1) This system must have been purchased from an authorized Nady dealer and all warranty
service must be performed by Nady’s service department. Any service not performed by Nady
will automatically void this warranty.
2) Items not covered: physical damage resulting from improper handling of the unit in transit from the
factory by the shipper (Nady Systems is not responsible for such damage and all such claims must be
made against the shipping company by the consignee); defects caused by normal wear of the product
(expendable parts are typically connectors, cables, potentiometers, switches and similar components);
damage or defects caused by abuse, neglect, accident, failure to connect or operate the unit in any way
that does not comply with applicable technical or safety regulations, or improper repair, excessive heat
or humidity, alteration or unreasonable use of the unit, causing cracks, broken cases/housings or parts;
damage caused by leaking batteries; finish or appearance items; items damaged in shipment en route to
Nady Systems, Inc. for repair. The warranty is null and void if any Nady serial number has been removed
or defaced.
How To Obtain service:
1) If factory service is required, please contact our Service Department at (510) 652-2411 for a return
authorization (R/A) number. Make sure the R/A number is clearly marked on the outside of your package.
(Please note: if an R/A number is not included, our Shipping Department cannot accept your package.)
2) Send the unit back to Nady Systems, 6701 Shellmound Street, Emeryville, CA, 94608, freight pre-paid.
You must include proof of date and place of purchase (i.e., photocopy of your bill of sale) or Nady cannot
be responsible for repair or replacement. Nady Systems, Inc. will not repair, nor be held responsible,
for any units returned without proper identification, return address, and R/A number clearly marked
on the package.
3) Per the above, Nady will perform all warranty service and return the unit to you at no charge.
Nady Systems will inform the buyer if product sent in does not meet the terms of this warranty
and will provide a quote for fixing the unit and/or shipping it back exclusively at the buyer’s expense.
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Service Information
In the u.s. If you are experiencing operational problems with your system, please refer to
service, please contact the Nady Service Department at (510) 652-2411 to obtain a Return
Authorization (R/A) Number and service quote (if out of warranty). Make sure the R/A
Number is clearly marked on the outside of the package that you are returning.
If your unit is out of warranty, please enclose a cashier’s check or money order (or pay
by credit card) per instructions by the Nady Service Department. Ship your unit prepaid
to: Nady Systems, Service Department, 6701 Shellmound Street, Emeryville, CA 94608.
Include a brief description of the problem you are experiencing. For service of a unit under
warranty, please follow the instructions in the following section.
Outside the u.s. For service or warranty matters please contact the Nady distributor in your
country through the dealer/store from which you purchased this product.
Do not attempt to service this unit yourself as
it can be dangerous and will also void the warranty.
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6701 Shellmound Street Emeryville, CA USA 94608
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