NU20-H
NU20 Dual UHF Wireless Microphone Systems
171.924UK
Introduction
Thank you for choosing the Chord NU20 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
- NU20 dual UHF wireless receiver
- 19” rack ears
- 2 x UHF aerials
- 2 x BNC antenna cables (for front panel mounting)
- 2 transmitters (NU20-H handhelds or NU20-N bodypacks)
- 2 x neckband and 2 x lavalier microphones (NU20-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.
Warning
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.
Safety
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
Placement
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.
Cleaning
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
Receiver Front Panel
No | Function | No | Function |
---|---|---|---|
1. | Power on/standby switch | 3. | Channel volume controls |
2. | RF carrier signal indicators | 4. | AF audio signal indicators |
Receiver Rear Panel
No | Function | No | Function |
---|---|---|---|
5. | DC power input jack | 8. | CH.B balanced XLRM output |
6. | CH.B antenna connection (BNC) | 9. | CH.A balanced XLRM output |
7. | 6.3mm jack output (CH.A + CH.B mix) | 10. | CH.A antenna connection (BNC) |
Transmitters
No | Description |
---|---|
11. | On indicator (handheld) |
12. | On/off switch (handheld) |
13. | Battery compartment (handheld) |
14. | Antenna |
15. | On indicator (bodypack) |
16. | On/off switch (bodypack) |
17. | 3.5mm threaded jack socket |
18. | Gain control |
19. | Battery compartment (bodypack) |
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-20 receivers.
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.
Operation
Switch on power to the receiver unit.
Move the switch on the handheld transmitter(s) to the fully up position (ON) and gradually increase the microphone level on the receiver (for bodypack transmitters, move the top slide switch to “ON”), then increase the volume on the mixer or amplifier until the sound from each microphone can be heard through the equipment.
Note: if output is low from the neckband or lavalier microphone, it may be necessary to adjust Gain control inside the bodypack unit
After use, 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.
Please note that each transmitter slide switch has a “MUTE” centre position, which is not used with the NU-series system. Switching the transmitter off automatically mutes the reception channel.
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 antennas can also help avoid damage when the system is not in use.
Troubleshooting
Issue | Solution |
---|---|
“POWER” LED does not light on receiver | Ensure power adapter is connected to mains and working properly |
Ensure receiver is switched on | |
“POWER” LED is lit but no “RF” or “AF” LEDs | Ensure transmitter is switched on |
Check that transmitter is not out of reception range | |
Check that transmitter batteries are good/charged | |
“POWER” and “RF” LEDs are lit but no “AF” and no sound | Check that transmitter switch is switched on |
Ensure transmitter has good/charged batteries | |
Ensure there is no other nearby transmitter with the same frequency | |
All LEDs lit but no sound from mic | Make sure receiver is connected to mixer/amplifier |
Ensure that receiver and amplifier/mixer channel volumes are turned up | |
Microphone output is very loud or distorted | 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 | |
Microphone output is very low | 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 |
Specification
Specification | Value |
---|---|
Weight : beltpack transmitter | N/A |
Dimensions : beltpack transmitter | N/A |
Weight : handheld transmitter | 238g (no battery) |
Dimensions : handheld transmitter | 243 x 48mmØ |
Power supply | 14Vdc 350mA (adaptor included) |
Carrier frequencies | 863.8MHz + 864.8MHz |
Wireless range | Up to 60m |
Batteries | 4 x AA (2 per transmitter) |
S/N ratio | >80dB |
THD | <0.5% @ 1kHz |
Output impedance | 2.2k Ohms |
Output level | 400mV (balanced), 200mV (unbalanced) |
Frequency response : ±3dB | 50Hz-18KHz |
Dimensions : receiver | 409 x 190 x 44mm |
Weight : receiver | 1.37kg |
Precautions
CAUTION | ||
RISK OF ELECTRIC SHOCK DO NOT OPEN | ||
CAUTION : TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK) NO USER-SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL |
This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit
This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit
Safety Notice
- Prior to use, read through this safety guide.
- Pay attention to safety warnings.
- Observe all operating requirements.
- For any items designed for indoor use only, do not operate near water or in humid environments.
- For cleaning, only use a lint-free, dry cloth.
- Install according to the specifications.
- Place away from heat sources or heating appliances.
- During placement, ensure adequate support for the product and access to controls and connectors.
- Do not obstruct any cooling vents or openings and allow adequate space for air flow.
- Use only power connections supplied with the product or suitable equivalents.
- Do not modify the equipment in any way.
- For any mains powered appliances, ensure that the mains voltage is as described in the specifications.
- Keep powered products and batteries away from the reach of children.
- In case of malfunction, water ingress or other damage, consult qualified service personnel.
- Avoid pressure or impact to the housing that may result in damage when transporting or installing this product.
- For any Earthed mains product, ensure that the power supply has a protective Earth connection.
- Keep all packaging materials out of reach of children.
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.
AVSL Group Ltd, Unit 2 Bridgewater Park, Taylor Road, Manchester, M41 7JQ, Unitied Kingdom
AVSL (EUROPE) Ltd, Unit 3D North Point House, North Point Business Park, New Mallow Road, Cork, Ireland