Welcome to UKQRM

This website has been created by Radio Amateurs, Shortwave radio listeners, Citizens' Band radio users, EMC professionals, and like-minded people, to pool our knowledge of man-made interference (QRM) so we can help you to understand and identify the sources of radio interference, and how you can go about reducing or removing the offending device, or devices. Interference is a highly technical issue, with brain-bending terms, which we will try to explain in an easy to understand manner.

This website is now https for your protection against oppressive regimes, government snooping, and censorship.

If you are suffering from a strange-sounding interference to your External link  FM radio, External link  DAB radio, Taxi radio, Business radio (inc. shopping-centre radio), External link Airband VHF, External link Marine VHF, Military radio, External link  Amateur radio, External link  Citizens' Band radio, or External link  Shortwave radio, we may be able to help.

What is interference?

In radio parlance, there are two types of interference, which we define by the Internationally recognised External link Q-codes:

Naturally occurring radio interference (static) from the sun, aurora, lightning storms, and other atmospheric disturbances.
Solar Aurora Lightning

Man-made interference, mostly generated by electrical systems and electronic gadgets.

UKQRM is concerned with man-made radio interference, or to give it another name: pollution. Unlike tainted food, or unpleasant odours on the wind, humans cannot perceive radio spectrum pollution, but it is there, destroying a natural resource that cannot be replaced. The menu on the left provides navigation to the various pages where we describe the lack of action from the regulators, the interference sources, and how you can mitigate against them.

If you would like to join our technical discussion group, please follow the link to groups.io:

groups.io logo

Report it!

We would encourage all users of the radio spectrum who experience interference to run through our Finding QRM guide, and if the interference is found to be external to your property, contact Ofcom and report the issue. Please do not be put off by their statement on charging you should the interference be found to be under your control. As long as you have powered off your home (and any adjacent properties supplied via a different meter) and can demonstrate the interference is not coming from anything of yours, you will not be liable. If you are a licensed Radio Amateur, enter your license number and callsign. If you are a member of the public, simply put "n/a" in those fields. Remember to obtain your case number from them!

External link https://www.ofcom.org.uk/spectrum/interference-enforcement/interference-complaints

or telephone: 0300 123 3333

We would also encourage you to write to your MP to highlight the problem of junk electronics and how it has affected your life.


31st October 2021 The Final Report on the Study on the evaluation of the Electromagnetic Compatibility Directive 2014/30/EU (EMCD) has now been published. The report in English running to 358 pages makes interesting reading. It is publicly available, free of charge, from the External link  Publications Office of the European Union.

The study’s main objective was to support an evaluation of the Electromagnetic Compatibility Directive (Directive 2014/30/EU) (“the EMCD”) by the European Commission’s DG GROW. The study has assessed five key evaluation criteria, namely the Directive’s effectiveness, efficiency, relevance (including fitness for purpose), coherence and EU added value. The EMCD has not previously been evaluated, and after almost 30 years without major modifications, it was therefore timely to consider the extent to which the Directive overall – and the essential requirements in particular – have achieved their objectives, and done so efficiently and effectively. Beyond the five key evaluation criteria mentioned above, an overarching issue – linked to relevance – was to consider if the EMCD has remained fit for purpose.

15/08/2021 Site news: optimised for mobile devices.

02/01/2019 Site news: we have removed the "contact us" form and replaced it with a simple link for mail clients. Our apologies if this causes issues. Spammers were using our form to annoy us and we did not want to implement another system that may have tracked users. Likewise, we have removed the translate and like buttons to reduce tracking by 3rd party websites.

04/08/2017 UKQRM has joined the European Radio Amateurs' Organisation to help spread the knowledge of harmful radio-spectrum pollution.

04/08/2017 External link RSGB comments on Ofcom VDSL report

06/06/2017 Ofcom finds "no evidence" for claims of interference from VDSL External link http://www.ispreview.co.uk/index.php/2017/06/ofcom-finds-no-evidence-claims-interference-vdsl-broadband.html

18/11/2016 German Amateur Radio group, the External link  DARC reports the Amateur Radio Round Table (RTA) has asked the German Federal President not to sign the Act implementing EMC Directive 2014/30/EU.

They cite deficiencies in the Act and loss of the right to interference free radio reception.

They say the Act is in breach of the Charter of Fundamental Rights of the European Union. Article 11 (Freedom of Expression and Information) which says:

"1. Everyone has the right to freedom of expression. This right shall include freedom to hold opinions and to receive and impart information and ideas without interference by public authority and regardless of frontiers."

The DARC says the Federal President could refuse his signature as part of his audit regarding the conformity of the Act with the German Basic Law. This would prevent it being enacted.

04/08/2016 The Sky Q box has landed and is now being deployed into people's homes. Already critised for including PLT in the design, it now appears as if Sky have removed any ability to disable the PLT system. It has already started to cause major problems:

External link  http://helpforum.sky.com/t5/Sky-Q/Sky-Q-and-the-terrible-RF-interference-it-puts-out/td-p/2495775

This is a repeat of BT Vision supplying the Comtrend PG902 with its Vision product. A disaster for the radio spectrum that gave birth to UKQRM. Here we go again!

19/04/2016 Statutory Instrument 2016 No. 426 External link  The Wireless Telegraphy (Control of Interference from Apparatus) Regulations 2016 is in effect!

Read online (link above) or External link  download the PDF PDF

We urge all radio users to test this legislation by complaining to Ofcom about interference to your radios.

24/03/2016 Ofcom announces their External link  Decision to make the Wireless Telegraphy (Control of Interference from Apparatus) Regulations 2016.

18/07/2015 Radio Amateur, Brian G4LUL, shares his experiences of trying to track down sources of interference and how cheap non-compliant electronics can ruin people's enjoyment of radio.

Click here for older news stories.

Ofcom Consultation

On the 5th January 2015, Ofcom released a consultation proposing to make new regulations under Section 54 of the Wireless Telegraphy Act (2006) which would give them unyielding authority to take criminal action against persons causing radio interference with their electronics. The substance of Ofcom’s argument for making the new regulations is the discrepancy between the requirements of the EU Directive which have far-reaching powers to protect radio from products when first placed on the market or put into service (i.e. at the precise moment this happens, not as an ongoing basis) and the fact that once equipment was in service, Ofcom claim they had no powers to take action against owners of interference generating electronics.

In essence, the new regulations are aimed at any device or installation which results in a breach of the essential requirements once installed and used in accordance with manufacturers' instructions. Naturally the most significance for these measures will be the potential for protection for amateur radio and SWL from devices like PLT, LED lighting and Plasma TV; which are by far the three most problematic technologies.

The consultation location at Ofcom is at: External link  http://stakeholders.ofcom.org.uk/consultations/undueinterference/

A direct link to the PDF to download is at: External link  http://stakeholders.ofcom.org.uk/binaries/consultations/wta-notice-propossals/summary/WTA_SI_2015_Consultation_Document.pdf

The proposed regulations PDF is at: External link  http://stakeholders.ofcom.org.uk/binaries/consultations/wta-notice-propossals/annexes/Annex6.pdf

The consultation ended on the 15th February 2015 and the following replies [to the consultation] make for interesting reading:

BT responded in the positive, but want powers extended to cover fixed-line installations: External link  BT_Response.pdf

Somewhat two-faced considering they are responsible for starting most of this in 2008 with BT Vision pushing PLT!

The RSGB have given them a smack on the nose with a rolled-up newspaper: External link  RSGB.pdf

The Maritime and Coastguard Agency are not happy: External link  The_Maritime_and_Coastguard_Agency.pdf

"We point to power line transceivers as a potentially difficult area for standards..."

"The explanation of the need for better regulation is good and the intent is supported; however we question whether the proposed regulations give sufficient protection to safety of life and other services. Therefore we do not agree with the Proposed Regulations."

The Federation of Communications Services: External link  FCS.pdf

On the 24th March 2016, Ofcom announced their External link  Decision to make the Wireless Telegraphy (Control of Interference from Apparatus) Regulations 2016.

The Statutory Instrument 2016 No. 426 The Wireless Telegraphy (Control of Interference from Apparatus) Regulations 2016 came into effect on the 18th April 2016 (see news above).

Power Cut!

We are indebted to Radio Amateur, Martin G8JNJ, for sending in a chart demonstrating the difference in radio interference levels when the electronic "junk" around his area is powered up and when the area has lost mains-power. As you can see, it is somewhat quieter when all of the non-EMC-compliant devices are no longer generating radio interference.

Noise levels
Difference in noise floor (3000 Hertz bandwidth) received on a 10 metre-tall vertical aerial
during and after a power outage, affecting a property radius of approximately 100 metres.


Many of the interference sources listed on this website are classed by the telecomms industry as sources of Repetitive Electrical Impulse Noise (REIN) or Single Isolated Impulse Noise (SHINE). The effects of REIN or SHINE can often be heard on radio systems as radio frequency interference, and experienced on telecomms systems in the form of DSL drop-outs/slow-downs. Examples of causes include:

Follow our Finding QRM guide to help track down the sources of REIN or SHINE that may be lurking in your home.

EMC Directive 2014/30/EU

The new electromagnetic Compatibility Directive has now been published in the OJEU (Official Journal of the European Union, 29/3/2014). This replaces the previous Directive 2004/108/EC which repealed 89/336/EEC.

The new Directive addresses some of its predecessor's ambiguities and makes clear that its jurisdiction relates to products when they are first placed on the market or put into service. This includes second-hand equipment if it has not previously been placed on the market in the EU.

The Directive has been watered down as to Member States' mandatory requirement to protect radiocommunications. We are now poised on the precipice of a slippery slope with regard to European Regulation of the radio spectrum.

The new Directive can be downloaded from: here.

A new Blue Guide has also been produced to explain the implementation of the new Directive(s).

About us

UKQRM was formed in 2008 by shortwave radio listener Mike Trodd. He started to experience a strange sound on his radios and wondered why he could no longer receive any broadcasts. He tracked the problem down to his neighbour's use of the Comtrend PG902 Power Line Technology, as deployed by BT Vision. PLT had arrived out of no-where and was suddenly popping up all over the UK. It has the capacity to wipe out HF radio communications from 500 to 1000 metres from the property using only one set of paired devices. Flood a small market-town with as few as 20 pairs of PLT and you suddenly find all HF communications is impossible. Mike started the Yahoo UKQRM group to pool knowledge and resources in what has turned out to be a long and un-ending fight against the rise of non-EMC-compliant electronics.

You can read all about the problems of PLT on our sister site:

Click here for the Ban PLT website.

Voluntary Code of Practice

If you have read our legislation page, you will have seen that things are in a mess, and as with the banks and the food supply, those charged with enforcing the law are asleep on the job, and may be complicit in encouraging manufacturers to break the law. Here at UKQRM, we would like to encourage manufacturers to go one stage further than simply including a Declaration of Conformity; which as we have seen with the Power Line Technology debacle, is no longer worth the paper it is printed on!

We would like manufacturers to include in their product literature:

We believe this approach will go some way to restoring confidence in honest manufacturers and help them stand out from those who are only interested in loading the market with junk electronics. We would like to encourage purchasers and consumer groups to push for this Code of Practice to help return the market place to a legal state, instead of the wild-west it has become.

Ethical Suppliers

Is your business refusing to sell PLT, Plasma televisions, and non-EMC-compliant LED lighting? Let us know and we will feature you as an ethical supplier.

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We would appreciate your support before the radio spectrum is destroyed forever. If you have a personal website, a shop/business website, a radio-club website, etc., and would like to carry our logo, please copy the code below. Let us know that you support us and we will add your logo and link to the website. Manufacturers and retailers who take the time and trouble to correctly test their products for EMC compliance, and prove that with traceable data, could appear here as a UKQRM approved product/supplier.

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Page updated: 24th December 2023

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