Page 32 bhi Ltd 22 Woolven Close Burgess Hill West Sussex RH15 9RR England email: sales@bhi-ltd.co.uk www.bhi-ltd.co.
7. Note: No user serviceable parts inside. Warrany void if speaker opened. When listening using headphones, care must be taken when switching the noise cancellation off, as high volumes of noise will be present. Approvals European conformity information · A sample of this product has been tested and found to conform to the following European Directives: 73/23/EEC – Low Voltage (safety) Directive 89/336/EEC – EMC Directive Prolonged exposure to high sound levels may lead to hearing damage.
6. bhi support Every noise-eliminating speaker comes with a 12 month guarantee against defective materials and workmanship. If you do have a problem then please refer to the troubleshooting section 4. If you have not resolved your problem then please contact us.
Table of Contents 1 Overview 1.1 1.2 1.3 1.4 2 NES10-2 2.1 2.2 2.3 2.4 2.5 3. NES-5 3.1 3.2 3.3 3.4 Pocket Reference Books Page bhi Introduction Audio DSP Noise cancellation Unpacking 5 5 6 7 Controls Description Specification Connection Setup 8 9 11 11 13 Connections Description Specification Setup 15 16 17 17 4.Troubleshooting 18 5. Accessories 23 6. bhi Support 30 7. Approvals Page 4 Have all the important information at your finger tips.
Noise Cancelling Headphones (NOT DSP) Order code:NCH These active noise reduction (ANR) headphones reduce the ambient background noise to allow you to listen to the program source peacefully. 1. Overview 1.1 bhi The headphones employ microphones to monitor the ambient noise. These microphones are wired out of phase and feed a differential amplifier which generates an opposing signal to that of the unwanted noise. This signal then cancels out the unwanted background noise. 1.
The speakers mount like any standard external speaker and are powered by any 12 – 24 vdc unregulated power source. You can use the optional bhi external power supply or in-vehicle adapter. The NES10-2 and NES-5 come as standard with a 2m audio lead terminated with a 3.5mm mono jack plug ready for immediate use. 1.3 Audio DSP Noise cancellation. NEDSP1062 Amplified DSP modules. These are as the NEDSP1061 modules, except they feature an integral 2.5W rms power amplifier.
Switch Box Order code: 1042 Switch Box Need to Connect more than one piece of equipment to your bhi Noise Eliminating Speaker or module? Switch box front view Switch box rear view Features: Allows 6 pieces of equipment to be connected to a Noise Eliminating Speaker, In-line Module or existing extension speaker 3 Inputs - loaded at 8 ohms 3 Un-loaded inputs (for low level signals) NEDSP1061 modules The NEDSP1061 modules again feature the bhi noise reduction DSP.
2. Other products avaialble from bhi. In-line module. NES10-2 2.1 Controls Noise Cancellation Selection Table NES10-2 Noise Eliminating Speaker bhi SW1 SW2 SW3 Level Filter Select PO Box 136 Bexhill on Sea East Sussex TN39 3WD On England Tel: + 44 (0)8702407258 Off Serial No.
Adaptors for connecting NES10-2 to equipment Radio connector Adaptor required 6.35mm (1/4”) mono socket 6.35mm mono plug - 3.5mm mono socket Order Number Adaptor required 3.5mm jack mono plug None Page 24 Description 1. The noise cancellation level DIP switch allows the user to select one 1 of 8 different settings, level 1 giving the least amount of noise cancellation, level 8 providing the most. The unit is factory set to level 6.
Once set the controls do not normally require any further adjustments. 5. LED indicator. The LED illuminates red when power is applied and changes to green when the noise cancellation is active. LED Colour Description 6. Off Red Green Power off/audio bypassed Power on Power on noise cancel- noise cancellation off lation on Noise cancellation ON/OFF switch. This switch turns the noise cancellation on and off, and should be in the “OFF” position prior to using the speaker. 7.
What is the fourth DIP switch for? Nothing, it is reserved for future expansion. What adjustments do I need to make during use? None. Once the NES10-2 is set to your personal settings no further adjustments should be necessary. Can the speakers be used with a switch mode power supply? No. The speakers shouldbe used with linear suppplies. Sometimes I can hear watery noises. When listening to high levels of noise, on high levels of processing the background may sound a little strange.
14.2000 Try transmitting again. If the problem persists , then move onto the next step. If the problem is cured, try removing the first ferrite. 14.195.00 000 145.0 For adaptors see section 5 Figure 8. Power lead suppression. NES10-2 Noise Eliminating Speaker bhi SW1 SW2 SW3 Level Filter Select PO Box 136 Bexhill on Sea East Sussex TN39 3WD On England Tel: + 44 (0)8702407258 Off Serial No.
Operators voice can be heard when transmitting. All bhi products operate correctly under normal working conditions. However if problems with feedback are experienced during transmisison then the following measures may help. 1. Reduce the sensitivity control (NES10-2 only) 2. Connect the speaker to a separate power supply (available from bhi - see section 5). 3. Ferrites Wind as many turns as possible around the ferrite Audio Lead 1” (25mm) ferrite ring 2.5 and operation 1.
SW 1 SW 2 SW 3 Level A ttenuation ON ON ON 1 9dB ON ON O FF 2 11dB ON O FF ON 3 13dB ON O FF O FF 4 15dB O FF ON ON 5 17dB O FF ON O FF 6 20dB O FF O FF ON 7 24dB O FF O FF O FF 8 35dB With the noise cancellation switch in the off position, make Note: The switches may be adjusted using a blunt implement such as ballpoint pen. 6.
4. Troubleshooting/FAQs Speaker doesn’t work at all, no sound from the speaker: 3. NES-5 3.1 NES-5 Connections 14.2000 14.195.00 3.5mm Jack plug Check that the power connector on your power supply is suitable for the power socket on the speaker (2.1mm, centre positive). Check that you have switched your radio communication equipment on and that you have a signal for the speaker to process. To verify this, remove the audio connector from the external speaker socket on your equipment.
3.2 Description 3.4 1. The power-in socket allows the user to switch on the NES-5 by using the bhi power supply (optional extra) or a suitable 12 –24V dc power source (min 500mA), with a suitable 2.1mm power connector, centre pin positive (fused at 3A). 1. 2. 3.3 2 metre audio input lead terminated with a 3.5mm mono jack plug. This lead connects to the external speaker socket or earphone socket of your equipment.
