Dual UHF Wireless System
Dual UHF Wireless System
Item ref: 171.974UK, 171.975UK, 171.976UK, 171.977UK
User Manual
Version 1.0
Caution: Please read this manual carefully before operating
Damage caused by misuse is not covered by the warranty
Thank you for choosing the Chord NU2 wireless system. This professional wireless set provides 2 high quality
microphones with UHF radio system for freedom of movement without loss of audio quality. Please read this
manual before using this equipment in order to avoid damage through incorrect operation and to get the best
performance from your purchase.
Package Contents
NU2 dual UHF wireless receiver
19” rack ears
2 x UHF aerials
2 x BNC antenna cables (for front panel mounting)
2 transmitters (NU2-H handhelds or NU2-N bodypacks)
2 x neckband and 2 x lavalier microphones (NU2-N only)
Mains power adapter
6.3mm mono jack lead
4 x 1.5V AA battery
If you find any accessory is missing or the product has arrived with any problems, contact your retailer.
These products contain no user-serviceable parts inside. Do not attempt to try to fix or modify these items
yourself as this will invalidate the warranty. We recommend you keep the original package and proof of
purchase for any possible replacement or returned demand.
To prevent the risk of fire or electric shock, do not expose any of the components to rain or moisture.
If liquids are spilled on any component, stop using immediately, allow unit to dry out and have checked by
qualified personnel before further use.
Avoid impact or heavy vibration to any of the components, dropping the microphone can cause capsule
failure. No user serviceable parts inside transmitter or receiver - refer servicing to qualified service personnel.
Ensure that the correct power adaptor is used with adequate current rating (350mA minimum) and that
the mains voltage is as stated on the adapter.
Avoid ingress of water or particles into the transmitters or receiver
Use alkaline or NiMH batteries in the transmitters and remove if unused for long periods.
Observe the correct polarity when replacing batteries
Keep all components out of direct sunlight and away from heat sources.
Do not place heavy objects on top of the receiver or transmitters
If rack-mounting, use rack ears provided and do not place heavy equipment above the receiver.
Keep the transmitters and receiver away from damp or dusty environments.
Use a soft cloth with a neutral detergent to clean the body of the handheld transmitter and receiver.
Lightly damp sterile wipes may be used on the microphone grille for hygiene purposes
To avoid damage, do not use solvents to clean the components
NU2 User Manual
Receiver Front Panel
VOLUME control - Channel A
RF carrier signal indicator - Channel A
AF audio signal indicator - Channel A
RF carrier signal indicator - Channel B
AF audio signal indicator - Channel B
VOLUME control - Channel B
Power on/off switch
Receiver Rear Panel
Power on/off switch
BNC antenna connector - Channel B
10. Balanced XLRM output - Channel B
11. Unbalanced 6.3mm jack mix output
12. Balanced XLRM output - Channel A
13. Po BNC antenna connector - Channel A
On indicator (handheld)
Off – Mute - On switch (handheld)
Battery compartment (handheld)
On indicator (bodypack)
Off – Mute - On switch (bodypack)
3.5mm threaded jack socket
Gain control
Note: If replacement transmitters are required, these must be genuine Chord branded transmitters
which transmit the correct pilot tone to match with the receiver. Transmitters which have the
same carrier frequency but not the correct pilot tone will not work with NU-series receivers.
NU2 User Manual
Setting Up
Insert the supplied AA batteries into the handheld transmitters by carefully unscrewing the base to
reveal the battery compartment inside the microphone body, connect the batteries (ensure + and are the correct way round for each cell) and carefully screw the base back on. For bodypack
transmitters, squeeze and flip forward the front cover to reveal the battery compartment and insert
AA batteries, observing correct polarity. Connect the 3.5mm jack connector from the neckband or
lavalier microphone to the input on top of the bodypack transmitter and rotate to secure the thread.
Position the receiver within the best available line of sight to the transmitters and connect the DC
jack of the supplied power adapter to the receiver and the plug-top to the mains outlet.
Connect both antennas to the BNC connectors on the rear panel or alternatively, attach to the rack
ears, connecting via the BNC extension leads supplied. Turn mic levels down on the receiver.
A choice of mixed output of both microphones on 6.3mm jack or individual balanced XLR outputs is
available on the rear panel of the receiver. Connect jack or XLR (optional) leads to the relative output
connector(s), turn down the volume of any equipment (mixer, amplifier etc.) that the signal will be
fed into and then connect the jack or XLRs to the equipment.
Warning! - take care not to point microphones towards speakers – this can cause damaging feedback
(loud whistle or howling noise) – try to aim microphones away from the speaker cabinets.
Switch on power to the receiver unit.
Move the switch on the first handheld or bodypack transmitter to the first notch (MUTE) – the LED
should light momentarily. Move on another notch (Fully ON) and gradually increase the microphone
level on the receiver, then increase the volume on the mixer or amplifier until the sound from each
microphone can be heard through the equipment. Repeat for the second microphone. (Note: if
output is low from neckband microphones, it may be necessary to adjust Gain control inside the
bodypack unit).
During use, it may be useful for the reception of the microphone to be muted for a short period of
time (e.g. to avoid feedback when walking across the front of a speaker or avoid handling noise
when placing the microphone down momentarily or adjusting a neckband microphone). In these
circumstances, it may be better to move the transmitter switch to the “MUTE” position, which
maintains the radio frequency carrier signal but mutes the microphone input. When this switch is
moved back to the “ON” position, the sound will be immediately restored without waiting for the
radio signal to be reinstated.
If the wireless system is not to be used for more than a few seconds, it is preferable to slide the
transmitter switch to the “OFF” position, which mutes and deactivates the radio signal and powers
down the transmitter. Turn down the volume of the mixer or amp and then switch off the receiver.
Unplug signal leads from the receiver and mixer or amplifier when moving or packing away. If the
system is not to be used for long periods of time, remove the batteries from the transmitters and
unplug the power adapter from the receiver and the mains outlet. Folding away or removing the
antennae can also help avoid damage when the system is not in use.
NU2 User Manual
Power supply (receiver)
Batteries (transmitters)
Carrier frequency (171.974UK, 171.976UK)
Carrier frequency (171.975UK, 171.977UK)
S/N ratio
Image rejection
Output impedance
Output level
Dimensions - handheld transmitter
Dimensions - bodypack transmitter
Dimensions - receiver
Weight - handheld transmitter
Weight - bodypack transmitter
Weight - receiver
12 - 18Vdc 500mA adaptor (supplied)
4 x AA (2 per transmitter - included)
863.3MHz + 864.3MHz
863.8MHz + 864.8MHz
<0.1% @ 1kHz
60m (max)
400mv (balanced), 200mv (unbalanced)
DC in, 2 x XLRM, 6.3mm jack
243 x 48mmØ
205 x 68 x 25mm
409 x 190 x 44mm
238g (no battery)
76g (no battery)
“POWER” LED does
not light on receiver
“POWER” LED is lit
but no “RF” or “AF”
“POWER” and “RF”
LEDs are lit but no
“AF” and no sound
All LEDs lit but no
sound from mic
Microphone output is
very loud or distorted
Microphone output is
very low
Ensure power adapter is connected to mains and working properly
Ensure receiver is switched on
Ensure transmitter is switched on
Check that transmitter is not out of reception range
Check that transmitter batteries are good/charged
Check that transmitter switch is not in “MUTE” position
Ensure transmitter has good/charged batteries
Ensure there is no other nearby transmitter with the same frequency
Make sure receiver is connected to mixer/amplifier
Ensure that receiver and amplifier/mixer channel volumes are turned up
Turn down VOLUME on receiver
Turn down gain on bodypack transmitter
Reduce gain on mixer/amplifier
Ensure that an XLR output is not fed to a line input
Turn up VOLUME on receiver
Turn up gain on bodypack transmitter
Increase gain of mixer/amplifier input
Ensure that a jack output is not fed to a mic input
Check transmitter batteries
Disposal: The “Crossed Wheelie Bin” symbol on the product means that the product is classed as Electrical or
Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life.
The goods must be disposed of according to your local council guidelines.
Errors and omissions excepted.
Copyright© 2016. AVSL Group Ltd.
NU2 User Manual
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