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About Us

bhi Ltd, 22 Woolven Close, Burgess Hill, RH15 9RR, United Kingdom
Tel: +44(0)1444 870333
Web: www.bhi-ltd.com

bhi Ltd design and manufacture a range of DSP noise cancellation products that remove unwanted background noise and interference from noisy voice and radio communication channels to leave clear speech. Aimed at a number of different radio related and voice communication markets, the products all incorporate unique Digital Signal Processing (DSP) technology to enable clear communications in noisy environments.
Founded in 2002, bhi quickly came to market with their first noise cancellation product, the NES10-2 DSP noise-eliminating speaker. Other products soon followed as bhi rapidly established a worldwide distribution network for their products in over 17 countries. They now have a comprehensive range of DSP noise elimination products and accessories for a wide range of applications and markets. A design service is also available to help customers integrate bhi’s DSP noise cancellation technology into their own products.Products are manufactured in the UK and overseas under the IS09001 quality standard.

Our Markets

It can be very difficult to understand what is being said when calling or communicating from a noisy environment. bhi’s noise cancellation products will integrate into most voice communication systems to greatly reduce this inherent problem. The products will remove the unwanted background noise and interference, whether it originates from the transmission process, or is picked up from the environment by a microphone. There is a solution to suit most types of radio and voice communications equipment: There are noise elimination speakers that fit into the base station or mobile environment, in-line noise cancelling modules that can be integrated into the communication system, or noise eliminating pcb modules that can be retrofitted internally into existing equipment or designed into new products. The products work just as well in the microphone path, on the transmit side, or in the receive path, and can be used to clean up noisy voice recordings.

So give us a call today if you would like to discuss your noise problems, and we can help you to select the best product to improve the speech quality in your comms system.

Typical Applications

bhi DSP Noise Cancellation Products

Would you like clear radio and voice communications?
Get a bhi DSP noise cancelling product and listen stress free! 
For more information 
Click here 

waveform grey 300
Don’t put up with noise and interference any longer!  
Give us a call on +44 (0)1444 870333

bhi ParaPro EQ20 DSP units with parametric audio equalisation

Shape the sound of your receive audio to suit your ears!

Shape the sound of your receive audio to suit your ears!

Contact Us

bhi Ltd
22 Woolven Close
Burgess Hill
West Sussex
RH15 9RR

Telephone: +44 (0) 1444 870333
Skype: bhi-sales

Information: Please contact us if you require further information regarding any of our products or would like to discuss your application in more detail.

Dealer contact:  Please click on the Dealer tab and look for your nearest dealer using the map, or if you know their name go to the alphabetic search tool.  Alternatively, contact us and we will more than happy to help you.


BHI Ltd Contact form

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Cookie Policy


What Are Cookies

As is common practice with almost all professional websites this site uses cookies, which are tiny files that are downloaded to your computer, to improve your experience. This page describes what information they gather, how we use it and why we sometimes need to store these cookies. We will also share how you can prevent these cookies from being stored however this may downgrade or 'break' certain elements of the sites functionality.

For more general information on cookies see the Wikipedia article on HTTP Cookies.

How We Use Cookies

We use cookies for a variety of reasons detailed below. Unfortunately in most cases there are no industry standard options for disabling cookies without completely disabling the functionality and features they add to this site. It is recommended that you leave on all cookies if you are not sure whether you need them or not in case they are used to provide a service that you use.

Disabling Cookies

You can prevent the setting of cookies by adjusting the settings on your browser (see your browser Help for how to do this). Be aware that disabling cookies will affect the functionality of this and many other websites that you visit. Disabling cookies will usually result in also disabling certain functionality and features of the this site. Therefore it is recommended that you do not disable cookies.

The Cookies We Set

  • Site preferences cookies

    In order to provide you with a great experience on this site we provide the functionality to set your preferences for how this site runs when you use it. In order to remember your preferences we need to set cookies so that this information can be called whenever you interact with a page is affected by your preferences.

Third Party Cookies

In some special cases we also use cookies provided by trusted third parties. The following section details which third party cookies you might encounter through this site.

  • This site uses Google Analytics which is one of the most widespread and trusted analytics solution on the web for helping us to understand how you use the site and ways that we can improve your experience. These cookies may track things such as how long you spend on the site and the pages that you visit so we can continue to produce engaging content.

    For more information on Google Analytics cookies, see the official Google Analytics page.

  • We also use social media buttons and/or plugins on this site that allow you to connect with your social network in various ways. For these to work the following social media sites including Facebook, Twitter, Instagram, Soundcloud, Reverbnation and YouTube, will set cookies through our site which may be used to enhance your profile on their site or contribute to the data they hold for various purposes outlined in their respective privacy policies.

More Information

Hopefully that has clarified things for you and as was previously mentioned if there is something that you aren't sure whether you need or not it's usually safer to leave cookies enabled in case it does interact with one of the features you use on our site.

However if you are still looking for more information then you can contact us through one of our preferred contact methods:

  • Email:
  • Phone: +44 (0)1444 870333



bhi DSP noise cancelling products will available at the following shows, rallies and exhibitions during 2017/18.  Please come along and hear live demos of our unique DSP noise cancelling products! 

Radio Society of Great Britain Rally and Events list click here

2nd Dec - Martin Lynch & Sons Hog Roast

15 APRIL 2018
Kempton Park Racecourse, Staines Road East, Sunbury on Thames, TW16 5AQ.

Sunday 29th April - bhi DSP noise cancelling products available at show prices from Radio World, Moonraker and LAM Communications

18th May - 20th May 2018 Dayton Hamvention 2018

1 - 3 June HAMTRONIC SHOW, FRIEDRICHSHAFEN - Messe, Friedrichshafen, Germany
Visit our booth A1-703 and see our new ParaPro EQ20 range of audio DSP products.
Also trade stands, special interest groups and IARU Member Socities all have stands in the main hall. Large flea market. Lectures take place each day, some in English. There will be a large RSGB book stall. [www.hamradio-friedrichshafen.de].


How To Order

Telephone: +44(0)1444 870333 - Simply telephone us if you want to place an order over the phone or you if you would like help in selecting the right product.

On-line shop and ordering: You can place an order on-line securely from this website by by using a credit card. We accept Mastercard, Visa and also payment using PayPal.  Our website is secure so you can place your order with confidence. 
Search for the product you want and add it to your basket. If you are not sure what you are after, use the search box at the top of the page. You can continue to browse the subject areas or search for other products and add them to your basket by pressing the appropriate "Add to Basket" button. At any time you can view your basket in the blue box on the rhs of the screen. Once you have added all the items you need into your basket you can Checkout and make the payment.

bhi are also PCI/DSS credit card compliant through securityMETRICS.


Our standard shipping method for all deliveries world-wide is by Royal Mail up to 2Kg.  For orders over 2Kg we use a parcel service for the UK, and a European road service for Europe (up to 5 days).  We can offer other methods for shipment.  Please contact uo for more information or to get a shipping quotation. See our shipping rates table for more information on our postage and packing rates.

Courier/Airfreight services:
These services can be provided on request for extra cost. If your order is urgent and you require a quicker shipping method please contact us and we will provide you with a quote for this service.

Customs, Import Duties and Taxes:
Orders for delivery outside the UK may be subject to customs brokerage fees, import duties, and taxes after the shipment reaches the destination country. Additional charges are the responsibility of the recipient because we have no control over these government-imposed charges and cannot determine what they may be. Customs policies vary greatly among countries. Please contact your local customs office for information.

New customers/Sign in:

If you are a new customer you will need to enter all your contact details and register to complete your order. You can be assured that we will not pass your details on to a third party, nor will we bombard you with marketing information. We may inform you of new products from time to time.

If you have ordered from us before you will need to sign in and all your details will appear, simply by entering your email address and the password you provided when you first ordered.

When placing an order:

Please enter your credit card details in the appropriate places on this screen.

The details of the products you have ordered appear on this screen and our standard shipping charges are applied, based on the address you have indicated we should deliver the order to.

Order Confirmation:

A summary of your order, address information and payment method is displayed. If this is correct, you should press the Finish button to place your order.

Thank you for your order:

If you see this screen you have completed your order. You will receive a confirmation email at the email address you provided and you can print this screen for reference.

If you have any queries during the order process, please don't hesitate to call us on +44(0)1444 870333

Privacy Statement

Your privacy is paramount to bhi Ltd and we are committed to protecting your privacy online. We will treat any personal information by which you can be identified (i.e. name, address, email etc.) in accordance with the provisions of the Data Protection Act of 1998. The bhi online shop is operated by bhi Ltd which is the Data Controller for the purposes of the Data Protection Act 1998. You may contact us at the following address: bhi Ltd P.O Box 318, Burgess Hill, West Sussex, RH15 9NR.

The information you provide to us during your use of our on-line shop will be used by us in order to supply you with services [under the Terms and Conditions of our Website]. We may also collect information about you in order to contact you from time to time by email or telephone with details of opportunities which may be of interest to you.

bhi Ltd will not sell, trade or rent your information to other third parties.

bhi Ltd will not collect any personal information without your knowledge. This information will be collected for a known purpose that you understand and will not be used in future for any other reason other than the one it is being collected for in the first instance.

The collection of information is for the purpose of communicating with you in regards to an online queries and orders and/or your benefiting from our online transactional services.

This information is collected by you filling an electronic form and is encrypted all cases apart from when using "contact us" and "customer feed". Your trust and confidence in bhi online shop is key to our success and would welcome any comments / doubts / suggestions that you may have.

You may at any time request a copy of the information we hold on you (for which we may charge a small fee) by writing to us at the above address.

We will endeavour to keep your personal information secure and will process your personal information in the manner indicated in this policy, which we may update from time to time.

Subject to the restrictions on use of personal data which bhi observes in accordance with this Personal Data Policy, any communication or material transmitted to the website by email or otherwise, including any questions, comments, suggestions or similar type of information is, and will be treated, as non-confidential and non-proprietary. Any such information transmitted or posted may be used by bhi Ltd for any purpose, including, but not limited to, marketing, reproduction, disclosure, transmission, publication, broadcast and posting.

We use small files known as "cookies" in order to facilitate the use of our Website. Cookies do not contain information which enable anyone to contact you directly by telephone, e-mail or in any other way. Cookies are important as they enable us to deliver the services from the Website. It is a requirement of any person who subscribes to the Website to allow the use of cookies and we cannot accept any responsibility if you disable cookies in your browser.

Information Provided By Users

You undertake that any information or data, including personal data relating to third parties, which you supply to this website:

  • shall be accurate and as comprehensive as reasonably possible;
  • shall not be false, inaccurate or misleading;
  • will be updated by you (particularly if it becomes false, inaccurate or misleading) by written notice to us if the information was previously provided by you or on your behalf and is contained in a repository;
  • shall not be fraudulent or involve the representation of counterfeit or stolen items;
  • shall not infringe any third party's copyright, patent, trademark, trade secret or other proprietary rights or rights of publicity or privacy;
  • shall not violate any law, statute, ordinance or regulation (including without limitation those governing export control, consumer protection, unfair competition, antidiscrimination or false advertising);
  • shall not be defamatory, trade libellous, unlawfully threatening or unlawfully harassing;
  • shall not be obscene or contain pornography;
  • shall not contain any viruses or other computer programming routines that may or will damage, detrimentally interfere with, intercept or expropriate any system, data or personal information;
  • shall not create liability for us or cause us to lose (in whole or in part) the services of our ISPs or other suppliers;
  • shall not be such as to cause us to violate any applicable law, statute, ordinance or regulation or bring us into disrepute with any professional body, trade organisation, government department or inter-governmental organisation;
  • without limiting the generality of the foregoing you undertake to obtain the consent of any individual whose personal data you submit to this website.
  • In particular, we disclaim all liabilities in connection with the following:
  • incompatibility of the on-line shop with any of your equipment, software or telecommunications links
  • technical problems including errors or interruptions of the on-line shop
  • unsuitability, unreliability or inaccuracy of the on-line shop
  • inadequacy of the on-line shop to meet your requirements


By submitting information, data or materials to the website, each user agrees to indemnify, defend and not hold bhi Ltd, directors, officers and employees from all damages, costs and expenses, including reasonable lawyer's fees and court costs arising out of all claims, challenges or actions related to your or your employees' or representatives' submission of such information, data or materials, including without limitation, claims for infringement of intellectual property rights, libel and defamation or breach of the Data Protection Act 1998.

Disclaimer Notice


bhi Ltd: The bhi Ltd on-line shop is provided by bhi Ltd without any warranties or guarantees. You must bear the risks associated with the use of the Internet.
The on-line shop provides content from other Internet sites or resources and while bhi Ltd tries to ensure that material included on the on-line shop is correct, reputable and of high quality, it cannot accept responsibility if this is not the case. bhi Ltd will not be responsible for any errors or omissions or for the results obtained from the use of such information or for any technical problems you may experience with the on-line shop. If bhi Ltd is informed of any inaccuracies in the material on the on-line shop we will attempt to correct the inaccuracies as soon as we reasonably can.
In particular, we disclaim all liabilities in connection with the following:

  • incompatibility of the on-line shop with any of your equipment, software or telecommunications links
  • technical problems including errors or interruptions of the on-line shop
  • unsuitability, unreliability or inaccuracy of the on-line shop
  • inadequacy of the on-line shop to meet your requirements

To the full extent allowed by applicable law, you agree that we will not be liable to you/or any third party for any consequential or incidental damages (including but not limited to loss of revenue, loss of profits, loss of anticipated savings, wasted expenditure, loss of privacy and loss of data) or any other indirect, special or punitive damages whatsoever that arise out of or are related to the on-line shop.

Nothing in this Disclaimer Notice shall exclude the liability of bhi Ltd for personal injury or death caused by its negligence.

Copyright Statement

All pages and content (c) bhi Ltd 2009, unless otherwise stated.

Repairs & Upgrades

Repairs and Returns to bhi:

Please EMAIL or CALL us prior to sending your product back to see if we can sort the problem for you. If not please contact us for an “Authorisation for return”, telephone 01444 870333 or EMAIL

For customers outside the Europe, please follow the instructions below on what to write on the package so the UK customs don't charge us import duty and taxes. If you do not follow this procedure and bhi are charged customs fees for the repaired item entering the UK we reserve the right to pass these customs charges onto you with the repair costs.
For Returns and repairs from outside the Europe, clearly mark the package(s) and accompanying Customs declaration with the following and put the value at 15GBP, stating that the goods are for repair:

"IPR suspension"
"IPR authorisation no:_______________"; and,
VAT number GB791095312.

We will repair your faulty bhi product for a set fee of £29.95 excl' VAT plus a postage and packing charge depending on which product it is (see shipping rates table). All repaired products are returned with 3 months warranty from the date of the repair if outside the standard 12 months guarantee, otherwise 12 months warranty applies. If your product is still within warranty and the fault was caused by a failed component then there will be no charge for the repair.


The same charges above apply for upgrades of the NEIM1031 to the MKII version.
When returning product to bhi, please put a note in with the repair which should include the following: Your name, address, telephone number and description of fault. If your product is still under warranty, then please supply a copy of the sales receipt, or rough date and where the goods were purchased (we can usually confirm whether the unit is still under warranty).

Note : It is not possible to upgrade the NES10-2MKII to the MK3 version, or the ANEM to the ANEM MKII version.

Acceptable payment methods:

Acceptable payment methods are Visa, MasterCard,AMEX, cheque or PayPal. (If paying by cheque, your order will be held until your cheque is cleared).

Send repairs to:

bhi Ltd
22 Woolven Close
Burgess Hill
West Sussex
RH15 9RR

RoHs and WEEE

bhi is fully compliant with WEEE (Waste Electrical & Electronic Equipment) bhi is fully compliant to the Waste Electrical & Electronic Equipment (WEEE) Regulations 2006. We are a Member of the Compliance scheme (Scheme Approval Number WEE/MP3538PZ/SCH), which will handle our WEEE obligations on our behalf.

Our Producer Registration Number is WEE/JJ0248QZ. This EU legislation states that all producers who put products put on the market should have a “crossed out” wheelie bin symbol on the product, product packaging or product literature to denote membership of a compliance scheme. This marking indicates that products should not be disposed of with other household waste at the end of their working life. To prevent possible harm to the environment or human health from uncontrolled waste disposal, bhi products should be separated from other types of waste and recycled responsibly to promote the reuse of material resources. Contact your local recycling and waste disposal centre for details of where and how to dispose of the product responsibly.

Crossed out wheelie bin symbol
"Crossed out" wheelie bin symbol

RoHS Directive 2002/95/EC (The Restriction of Hazardous Substances in Electrical and Electronic Equipment (RoHS) Directive)

The EC directive (the RoHS Directive) restricts the use of the hazardous substances listed below in electrical and electronic equipment. Below are the maximum concentration values of the restricted substances by weight in homogenous materials as stated in the RoHS Directive:

  • Lead 0.1%
  • Mercury 0.1%
  • Hexavalent Chromium 0.1%
  • Polybrominated Biphenyls 0.1%
  • Polybrominated Diphenyl Ethers 0.1%
  • Cadmium 0.01%

bhi Ltd takes all reasonable steps to confirm supplier’s statements regarding the absence of the restricted substances. All information regarding compliance is accurate to the best of our knowledge. Information provided by bhi on its website or in other communications concerning the substance content of its products represents knowledge and belief as of the date that it is provided. bhi bases its knowledge and belief on information provided by third parties and makes no representation or warranty as to the accuracy of such information. bhi continues to take reasonable steps to provide accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. Please note that Directive 2002/95/EC does not demand marking of compliant product - the action of placing a product on to the market after the implementation date is a presumption of

WEEE Producer Reg No: WEE/JJ0248QZ

WEEE bhi Product Dis-assembly Instructions Request Form

To whom it may concern: For instructions on the dis-assembly of bhi products for the purposes of separating the various component parts to enable the disposal of them in an environmental way. Please contact bhi Limited by emailing or write to the following address for information. Please give the specific product details in the request, along with your official EA registration number, Company details, address and full contact details.

Security Statement


Remembering passwords can be tricky, but setting effective and secure passwords on all the websites you use is vital in combating possible fraudulent activity using your personal details. It’s best to avoid using the same password for each of your online accounts, because if a criminal gains access to it, all your accounts could be at risk. Multiple passwords keep you safer.  When you set a password, it’s a good idea to use a mix of numbers and characters, and something that’s very personal to you. Most sites these days will set a minimum number of characters to use, but do avoid using obvious phrases like “password”, or your name, or phone number.  It’s a good idea to change your passwords on a regular basis, especially for sites you use frequently and which involve financial transactions.  If you ever get a request to reveal your password for an online site, don’t respond as legitimate sites and services won’t ask you to send them passwords via email. You may be tempted to share passwords with close family, but do keep in mind there’s always a risk they could pass information on inadvertently or share it with someone else.  You can re-set your password on at any time by signing into your account and choosing the Edit your password option. If you've forgotten your password, just enter your email address on the 'Forgotten your password' page, and we'll email you your password information. Then simply follow the instructions in the email to change your password.  It’s a good idea at this point to change your password to something that’s as secure as possible. If you decide to change your johnlewis.com account password, or if we prompt you to do so, we'll ask you to set one with no fewer than 8 characters,  to include a minimum of one upper and one lower case letter, and at least one number.  For more information on online safety and passwords, there are a number of useful websites such as Get Safe Online, Microsoft Safety & Security, Google good to know.

Computer security suggestions

Keep yourself safe from malware and viruses with up to date security on your computer. You can normally download free basic protection from providers such as AVG McAffee and malwarebytes but for more comprehensive cover, it’s best to choose security software,  that will Keep your software switched on and up to date. Also make sure that your Windows operating system has the latest Microsoft updates. It’s a good idea to run regular scans on your computer.  When you’re opening emails, be careful. Don’t click on links to download files or open attachments you haven’t asked for, or aren’t expecting, as they may contain viruses.

Privacy promise

Your privacy is very important to us which is why we make sure you’re always in control of what we do with your personal information.

This is our customer contact promise:

We’ll never pass your personal details to anyone outside bhi for them to use for their own marketing purposes.  We would only ever use your details in the future to give you:
Details of new products and services
Special offers
Or simply, to get your feedback

We will make sure our contact with you is relevant based on the information you give us.
You can opt out at any time. All you need to do is contact us and we will opt you out, but remember if you do ‘opt out’ of receiving this information you could miss out on offers and news. We’ll always comply with the Data Protection Act 1998 and all other relevant legislation.
Please do let us know if your details change so that we can continue to stay in touch.

Your transaction security

bhi-ltd.com is secure

We realise how important it is to securely store any information that you provide. bhi-ltd.com maintains the highest levels of security. Our site uses high-level SSL encryption technology, the most advanced security software currently available for online transactions.  You can therefore rest assured that we take the privacy and security of your payment and personal details very seriously.  You can tell whether a page is secure as 'https' will replace the 'http' at the front of the www.bhi-ltd.com in your browser address window. A small locked padlock will also appear in your browser window.


Phishing is the practice of tricking someone into giving confidential information. Examples include falsely claiming to be a legitimate company when sending an e-mail to a user, in an attempt to get the user to send private information that will be used for identity theft and fraud.
We'll never ask you to send any personal details via email. If we require such details, for security reasons we'll ask you to contact us by phone. Should you receive an email claiming to be from bhi Ltd requesting this kind of information, please don’t respond, but do let us know about it.


Cookies are tiny text files stored on your computer when you visit certain web pages. bhi-ltd.com uses cookies to keep track of what you have in your basket and to remember you when you return to our site. To shop at bhi-ltd.com you need to have all cookies enabled,  though you can still use the website for browsing and research purposes without them 

Shipping Rates

We endeavour to despatch all orders received before 2.00pm the same day.
Delivery times for orders outside of the UK will vary depending on the location.

Order weightUKEuropeRest of World
Up to 120g £3.95 £5.95 £6.95
Up to 250g £4.95 £9.95 £11.95
Up to 500g £5.95 £12.95 £13.95
Up to 750g £5.95 £13.95 £16.95
Up to 1Kg £5.95 £14.95 £18.95
Up to 1.25Kg £7.95 £16.95 £19.95
Up to 1.5Kg £7.95 £17.95 £21.95
Up to 1.75Kg £7.95 £18.95 £22.95
Up to 2Kg £7.95 £19.95 £24.95
Over 2Kg £9.95 *see below *see below


  1. UK, EU & ROW orders up to 120g by Royal Mail 1st Class standard service and Royal Mail International Standard service for overseas orders. 
  2. Orders over 250g by Royal Mail Signed For 1st Class (UK orders), and Royal Mail International Signed service for all overseas orders.
  3. Orders over 2Kg are shipped by parcel service for the UK and a European Road Service for Europe (Contact us for a European shipping quote).  For delivery of orders over 2Kg outside Europe, please contact us for a quotation.

For some UK orders we may ship by a next day signed for courier service (contact telephone number required in this instance) depending on Post Code.

We endeavour to despatch all orders the same day if received before 2.00pm the same day. Delivery times for international shipments will vary depending on the location, but are usually 3 to 5 days for Europe and 7 to 10 days for the rest of the world.

Important Notice - International orders exceeding 2Kg

The shipping rates above for all international orders are for single shipments not exceeding 2Kg. We have automatic shipping rates for UK and European orders over 2Kg but you can also try and split your order into 2 separate single orders on the shop so that both are under 2Kg and use Royal Mail shipping.  Please contact us so that we can arrange the most cost effective shipping prices for you. We can quote an express air service for other international orders. Please contact  or call us on+ 441444870333.

Speech Restoration

bhi DSP noise cancelling technology can clean up and improve the speech quality and intelligibility on noisy voice recordings from cctv audio, mobiles phone and audio cd/tape recordings.  This can be done in a number of ways by using on of our DSP noise cancelling In-Line modules or one of our other noise cancelling products.

NEIM1031MKII - Mono/single channel in-line unit that can take speaker level or line level audio.  There is a separate line level control for adjusting the line level input.

Dual In-Line - Stereo/Dual channel unit that can take stereo signals at speaker level or line level.  There is a line out socket, headphone socket and plane mono speaker level output on this unit.

Compact In-Line - Stereo/Dual channel unit that can take stereo signals at speaker level or line level.  There is an output socket that can connect straight to a pair of headphones or drive at line level. This unit is also suitable for portable use in real time as it is a compact, lightweight battery operated unit.

bhi DSP noise cancelling Low Level audio modules: You could also integrate one of our DSP noise cancelling pcb modules into your own audio equipment to clean up the noisy audio.  We can provide help and assistance with this process.  Check out the low level audio modules section for information on these products.  Please contact us for help and further information.








Support and FAQs

Have a Question or need technical support?

If you have any questions about our noise cancelling products or require some support please don’t hesitate to contact us.  Also, have a look at bhi's most commonly asked questions as they may help you...

Q. What does the fourth DIP switch on the NES10-2MKII do on the back of the speaker?
A. Nothing, it is not used.

Q. Do bhi DSP noise cancelling products work with SSB transmissions?
A. Yes they work with SSB transmissions and on all other radio bands as the DSP noise cancelling works with any signal that contains speech and is able to differentiate the speech from the noise.

Q. What adjustments do I need to make during use on the NES10-2MK3?.
A. The Volume/sensitivity control on the top of the speaker should be set at a qtr turn up from minimum.  You can make fine adjustments to this depending on the volume of the normal listening level from your radio in bypass mode. Once the NES10-2 is configured to your own personal settings the only adjustments needed are to select the suitable filter level for the current operating conditions (see user guide for details).

Q. I can sometimes hear a beating sound when listening to the unit?
A.  If you listen to bhi DSP noise cancelling products with no audio signal present, you may hear some DSP processing noise.  This is normal and part of the DSP doing its work.  Once a noisy signal is present you should not be able to hear this noise when listening. 

Q. Can I use a switch mode power supply with the speakers and in-line units?.
A. Yes you can use a switched mode power supply, but just be aware that the cheaper lower cost switched mode power supplies have been known to generate noise and cause interference.

Q. When transmitting, the signal can be heard through the speaker on the radio or in my headphones.
Explanation: bhi DSP noise cancelling products have plenty of RF protection inside. The reason for the issue is that you have some stray RF in your shack.  Firstly check that all your coax connections are secure, and that your antenna system is matched up as best it can be at the antenna feed point.  Also make sure that all your cables are routed as far away from the RF as possible. Having an Elevated SWR on the coax leading to your transceiver can cause transmit audio to be present. Try to match your antenna system up at the antenna feed point, and you shouldn’t hear any audio on transmit.  If this is not possible due to your setup and location then the following should help in eliminating this issue.
A1. Try using on a separate DC power supply to power your bhi unit.  We sell a number of different power supplies to suit our various DSP noise cancelling products: bhi power supplies
A2. Look at both help sheets below for a solution.

Additional Help

bhi have published the following documents to answer any further questions you may have.

RF Breakthrough/Earth Loop FAQ

RF breakthrough Help Sheet 1
RF breakthrough - power supply Help Sheet 2