citronic RU105 Multi-UHF Wireless System User Manual

citronic RU105 Multi-UHF Wireless System User Manual & troubleshooting

citronic RU105 Multi-UHF Wireless System User Manual  & troubleshooting 1RU105
Multi-UHF Wireless System
Item ref: 171.972UK, 171.973UK
User Manual

citronic RU105 Multi-UHF Wireless System User Manual  & troubleshooting 2

Version 1.1

citronic RU105 Multi-UHF Wireless System User Manual  & troubleshooting 3 Caution: Please read this manual carefully before operating Damage caused by misuse is not covered by the warranty

citronic RU105 Multi-UHF Wireless System User Manual  & troubleshooting


Thank you for choosing the Citronic RU105 wireless system. This professional wireless set provides a high-quality microphone with a PLL-tuned 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

  • UHF wireless receiver
  • 19” rack ears
  • UHF antenna
  • BNC antenna extension lead
  • Handheld transmitter or bodypack receiver with neckband and lavalier microphones
  • Mains power adapter
  • 6.3mm mono jack lead
  • 2 x 1.5V AA battery

If you find any accessories are missing or the product has arrived with any problems, please contact your retailer at once.
This product contains no user-serviceable parts so make no attempt to try to fix or modify this item 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 the unit to dry out, and have checked by qualified personnel before further use.
Avoid impact or heavy vibration to any of the components, dropping a microphone can cause capsule failure user-serviceable parts inside transmitter or receiver – refer servicing to qualified service personnel.


  • Ensure that the correct adapter is used with an adequate current rating 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.


citronic RU105 Multi-UHF Wireless System User Manual  & troubleshooting 5

  1. IR sync sender
  2. LCD display
  3. Previous (Group/Channel setting)
  4.  Next (Group/Channel setting)
  5. Set (Group/Channel)
  6. Output volume control
  7. Power on/off switch
  8. Balanced XLRM output
  9. Unbalanced 6.3mm jack output
  10.  DC power in jack (5.5 x 2.1mm)
  11. Antenna connector (BNC)


citronic RU105 Multi-UHF Wireless System User Manual  & troubleshooting 6

12. LCD display
13. IR sync detector
14. On/off switch
15. Battery compartment
16. Antenna
17. On indicator
18. Mute switch
19. 3.5mm threaded jack socket
20. LCD display and on
21. On/off button
22. Battery compartment

Setting Up

Insert the supplied AA batteries into the transmitter by carefully unscrewing the base of the handheld or opening the flap of the bodypack to reveal the battery compartment.  Insert the batteries (ensuring that + and – are the correct way round for each cell) and carefully replace the cover.
For neckband or lavalier microphones, connect the 3.5mm jack into the bodypack, screwing the threaded jack securely into the socket.
The receiver antenna may be connected directly to the BNC connector on the rear panel or alternatively front-mounted onto rack ears (see below)
If the receiver is to be rack-mounted, place the supplied rack ears against each side of the receiver and fix securely with 2 screws in each. These rack ears have a hole for front-mounting the antenna and a BNC extension lead for fixing into the hole. This should be connected to the BNC on the rear panel, creating a front pocket for the antenna to connect onto.
A choice of unbalanced 6.3mm jack or balanced XLR output is available on the rear panel of the receiver. Connect the jack or XLR (optional) lead to the relative 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.
Position the receiver within the best available line of sight to the transmitters and connect the DC jack of the supplied power adaptor to the receiver and the plug top to the main outlet.


Turn microphone levels down on the receiver and switch on power on the front panel of the receiver.
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.
For the handheld version, move the switch on the handheld transmitter upward to switch it on and the LCD display should light for a few seconds, showing the carrier frequency and battery status.
For the bodypack transmitter, press and hold the front on/off button until the display lights up for a few seconds, ensuring that the Mute switch is off. The display will show the current carrier frequency and battery status. The transmitter frequency should match the frequency on the receiver. If not, see “Tuning” below.
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.


The carrier frequency may be selected on the receiver unit by pressing the SET button twice, which causes the GROUP label to flash in the display. The ▲  and ▼ buttons can be used to select the Group from 1 to 7. Pressing the SET button again causes the CHANNEL label to flash. The channel can be selected within a group using the ▲  and ▼ buttons.
Groups 1 to 6 have between 3 and 5 preset channels, whilst Group 7 allows access to all 81 possible frequencies. Depending upon any other radio signals in the vicinity of the operating environment,
one particular Group may offer a better channel spacing than another and this should be determined by experimentation. If a particular group of frequencies results in poor reception or interference, try another or use Group 7 to manually select carrier frequencies in 25kHz steps.
Once a channel is selected, press SET to accept the channel and press SET again to transmit the IR sync signal (animated lines will show next to IR in the display). Hold the IR  detector on the handheld microphone or inside the bodypack battery compartment up to the IR sender on the main unit to sync the carrier frequency to the transmitter (the transmitter must be switched on for IR sync)

In Use

Switching on the transmitter will open up the radio carrier frequency to the receiver and also send a pilot tone frequency, which is not audible but is used by the receiver to open the audio channel. This system helps to avoid any spurious radio frequencies interfering with the wireless microphone signal.
When the transmitter’s RF signal is recognized by the receiver, an RF meter will show the carrier signal strength in the LCD display. Likewise, speaking into the microphone will send audio over this carrier and an AF volume meter will show the audio level in the LCD display.
For the neckband or lavalier microphone, there is also a mute switch on the top of the bodypack, which can be used to temporarily cut the microphone output whilst maintaining the carrier frequency. This may be useful to silence the mic whilst moving across the front of speakers or as a standby setting.
In addition, the bodypack has a Gain adjustment inside the battery compartment to match the gain level for the type of neckband or lavalier microphone that is connected to it.
If the wireless system is to be out of use for longer than a few seconds, it is preferable to switch the transmitter off, which deactivates the radio carrier 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 transmitters and unplug the power adapter from the receiver and the main outlet.
Folding away or removing the antennas can also help avoid damage when the system is not in use.


Power supply 12-18Vdc 350mA adaptor (supplied)
Batteries 2 x AA (included)
Carrier frequency 863.00 to 865.00MHz
Channels 81 tuneable UHF frequencies
Tuning method Phase-locked loop
S/N  ratio >105dB
THD <0.5% @ 1KHz
Frequency response 50Hz – 18kHz (±1dB)
Image rejection 85dB typical
Range 60m (max)
Output impedance 2.2k ohms
Output level Balanced: 0-400mv, unbalanced: 0-200mv
Connectors DC in, XLRM, 6.3mm jack, BNC antenna
Dimensions – handheld transmitter 265 x 49mmØ
Dimensions – bodypack transmitter 110 x 67 x 24mm
Dimensions – receiver 198 x 190 x 44mm
Weight – handheld transmitter 330g (no battery)
Weight – bodypack transmitter 75g (no battery)
Weight – receiver 710g


LCD display does not light on receiver Ensure the power adapter is connected to mains and working properly
Ensure receiver is switched on
Receiver LCD is on but now

RF or AF signals showing

Ensure that the transmitter is switched on
Check that the transmitter is not out of reception range
Check that the transmitter batteries are good / charged
Ensure that a genuine Citronic RU series transmitter is being used
Ensure transmitter and receiver frequencies are synced (see “Tuning”)
RF carrier is showing on

display but no AF showing

and no sound

Check that the transmitter switch is not in the “MUTE” position
Ensure transmitter has good / charged batteries
Ensure there is no other nearby transmitter with the same frequency
RF and AF are OK but no

sound from microphone

Make sure receiver is properly connected to amplifier/mixer
Ensure that receiver and amplifier/mixer channel volumes are turned up
The microphone output is very

loud or distorted

Turn down VOLUME on the receiver
Reduce Gain on mixer/amplifier
Reduce Gain inside the bodypack battery compartment if needed
Ensure that the XLR output is not fed to a line input
The microphone output is very low Turn up VOLUME on the receiver
Increase gain on the mixer or amplifier
Increase Gain inside the bodypack battery compartment if needed
Ensure that the jack output is not fed to a low Z input
Check transmitter batteries

citronic RU105 Multi-UHF Wireless System User Manual  & troubleshooting 7

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 of 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

Hereby, AVSL Group Ltd. declares that the radio equipment type 171.972UK and 171.973UK are in compliance with Directive 2014/53/EU

The full text of the EU declaration of conformity for 171.972UK is available at the following internet address:
The full text of the EU declaration of conformity for 171.973UK is available at the following internet address:
Errors and omissions excepted. Copyright© 2021.
AVSL Group Ltd. Unit 2-4 Bridgewater Park, Taylor Rd. Manchester. M41 7JQ
AVSL (EUROPE) Ltd, Unit 3D North Point House, North Point Business Park, New Mallow Road, Cork, Ireland.
171.972UK, 171.973UK User Manual


Setting up citronic RU105 Multi-UHF Wireless System User Manual is easy with these step-by-step instructions. Follow the steps are you are set-up in no time.

Using citronic RU105 Multi-UHF Wireless System User Manual is simple by using this manual. Follow the instructions one by one and everything will be fine

Is citronic RU105 Multi-UHF Wireless System User Manual stuck or not working properly? By resetting it you can set it back to the standard settings and everything should be back to normal. This works in many cases when problems arise.

This page contains the complete user instructions & manual for citronic RU105 Multi-UHF Wireless System User Manual

All symbols, colors and codes for citronic RU105 Multi-UHF Wireless System User Manual are explained in this instruction manual. You can find everything you need and moree