U-SERIES
UHF Wireless Systems
User Manual
Version 2.0
Introduction
Model
Stock code
Microphone 1
Microphone 2
UH1
171.822 / 171.823
Handheld transmitter
-
UH2
171.825 / 171.826
Handheld transmitter
Handheld transmitter
UN1
171.838 / 171.839
Neckband mic. + bodypack
-
UN2
171.827 / 171.828
Neckband mic. + bodypack
Neckband mic. + bodypack
UHN2
171.820 / 171.821
Handheld transmitter
Neckband mic. + bodypack
UL1
171.846 / 171.847
Lavalier mic. + bodypack
-
Thank you for choosing the Chord UHF-series wireless system. This professional wireless set provides a high
quality microphone 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.
Contents
Please take care when unpacking this product. Inspect for any damage and ensure you have the following
components…
UHF wireless receiver
Mains power adapter
6.3mm mono jack lead
2 x 1.5V AA battery (4 pieces for UH2, UN2 or UHN2)
Microphone / transmitter(s) – see table below
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 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 adaptor is used, ensuring that the mains voltage is as stated on the adapter.
Avoid ingress of water or particles into the transmitter(s) or receiver
Use alkaline or NiMH batteries in the transmitter(s) 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 transmitter(s)
If rack-mounting, secure the receiver to a 1U rack tray and do not place heavy items above the receiver.
Keep the transmitter(s) and receiver away from damp or dusty environments.
Cleaning
Use a soft cloth with a neutral detergent to clean the body of the microphone/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
UHF Wireless Systems User Manual
1. Windshield
2. Slide switch – OFF/MUTE/ON
3. Battery compartment cover
1. Antennae
2. Power adapter input
3. Balanced XLR output
4. Unbalanced 6.3mm jack output
1. Power ON/OFF switch
2. Channel A volume control
3. Channel A Audio indicator LED
4. Channel A Radio signal LED
5. Power indicator LED
6. Channel B Radio signal LED
7. Channel B Audio indicator LED
8. Channel B volume control
1. UHF antenna
2. LED power indicator
3. Slide switch OFF/MUTE/ON
4. MIC input, threaded 3.5mm jack
5. Frequency label
6. GAIN ADJUST rotary
7. Battery compartment
Handheld Transmitter Bodypack Transmitter
Receiver Rear Panel
Receiver Front Panel
UHF Wireless Systems User Manual
Operation
For handheld transmitters, insert the supplied 2 x AA batteries 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 bodypacks, squeeze down the clip in the centre of the front panel of the bodypack to unfasten the lower
half, which hinges outwards to reveal the battery compartment. Position the supplied 2 x AA batteries inside
(ensure + and - are the correct way round for each) and then close the battery compartment flap until clipped
back into position.
Position the receiver within the best available line of sight to the transmitter(s) and connect the DC jack of the
supplied power adapter to the receiver and the plug-top to the mains outlet. Extend both antennae fully
upwards and outwards slightly and switch the power on. Turn microphone level(s) down on the receiver.
Note: for dual sets (with 2 transmitters), both microphones’ outputs will be mixed and fed to both balanced
and unbalanced outputs.
Connect the jack or XLR (optional) lead to the receiver’s audio output connector, turn down the volume of any
equipment (mixer, amplifier etc.) that the signal will be fed into and then connect the jack or XLR to the
equipment.
Warning! - take care not to point microphones towards speakers – this can cause damaging feedback (loud
whistle or howling noise) – try to point microphones away from the speaker cabinets.
Move the switch on the handheld or bodypack transmitter to the first notch (MUTE) – the LED should light
momentarily. If the LED stays on, this is indicating that the battery is low or discharged. Move on another
notch (ON) and gradually increase the microphone level(s) on the receiver, then increase the volume on the
mixer or amplifier until the sound from the microphone can be heard through the equipment.
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.
Be sure to turn down the volume of the mixer or amplifier 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 transmitter and unplug
the power adapter from the receiver and the mains outlet. Retracting the antennae can also help avoid
damage when the system is not in use.
UHF Wireless Systems User Manual
Carrier type
UHF 863 - 865MHz
Frequency stability
±0.005%
Maximum deviation
±25kHz
Audio frequency response
40Hz – 20kHz
Signal to noise ratio
>105dB
Audio dynamic range
>80dB
T.H.D.
<0.5% @ 1kHz
Maximum range
50m
Operating temperature
-10ºC to +50ºC
Receiver
Power supply
12 - 18Vdc 500mA (mains adapter supplied)
Audio outputs
XLR (balanced), Jack (unbalanced)
Controls
Power On/Off, Mic. Volume(s)
Indicators
Power (main), RF and AF (for each channel)
Dimensions
45 x 210 x 180mm
Weight
573g
Handheld Transmitter (UH1, UH2, UHN2)
Battery
3Vdc (2 x AA)
Switch
Power / Mute / On
RF emission
>10mW
Capsule type
Dynamic - cardioid response
Dimensions
242 x 45mmØ
Weight (without battery)
238g
Bodypack Transmitter (UN1, VN2, UHN2, UL1)
Battery
3Vdc (2 x AA)
Switch
Power / Mute / On
Connector
3.5mm mono jack- threaded
Compatible microphones
171.855, 171.856, 171.857
RF emission
>10mW
Dimensions (not inc. antenna)
110 x 68 x 25mm
Weight (without battery)
76g
Neckband Microphone (UN1, UN2, UHN2)
Capsule type
Condenser - cardioid response
Power supply
3V phantom from bodypack
Connector
3.5mm mono jack - threaded
Dimensions
140 x 180 x 60mm
Weight
25g
Lavalier Microphone (UL1)
Capsule type
Condenser - cardioid response
Power supply
3V phantom from bodypack
Connector
3.5mm mono jack- threaded
Dimensions
40 x 27 x 20mm
Weight
20g
Specifications
UHF Wireless Systems User Manual
Model
Stock code
Mic 1
Mic 2
UH1
171.822
863.1MHz
-
171.823
864.1MHz
-
UH2
171.825
863.3MHz
864.3MHz
171.826
863.8MHz
864.8MHz
UN1
171.838
863.1MHz
-
171.839
864.1MHz
-
UN2
171.827
863.3MHz
864.3MHz
171.828
863.8MHz
864.8MHz
UHN2
171.820
863.3MHz
864.3MHz
171.821
863.8MHz
864.8MHz
UL1
171.846
863.1MHz
-
171.847
864.1MHz
-
“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 if transmitter switch is in “MUTE” position
Check if neckband or lavalier microphone is connected to bodypack
Ensure transmitter has good / charged batteries
Check if there is another nearby transmitter with the same
frequency
All LEDs lit but no sound from
microphone
Make sure receiver is connected to mixer / amplifier
Make sure that receiver and amplifier / mixer channel volumes are
turned up
Microphone output is very loud or
distorted
Turn down GAIN ADJUST on bodypack transmitter
Turn down VOLUME on receiver
Reduce Gain on mixer / amplifier
Ensure that XLR output is not fed to a Line input
Microphone output is very low
Turn up GAIN ADJUST on bodypack transmitter
Turn up VOLUME on receiver
Increase Gain on mixer / amplifier
Ensure that Jack output is not fed to a Mic input
Check transmitter batteries
Frequency Chart (all regions)
Troubleshooting
1622
Errors and omissions excepted.
Copyright© 2012. AVSL Group Ltd.
UHF Wireless Systems User Manual
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