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.
If you are suffering from a strange-sounding interference to your FM radio, DAB radio, Taxi radio, Business radio (inc. shopping-centre radio), Airband VHF, Marine VHF, Military radio, Amateur radio, Citizens' Band radio, or 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 Q-codes:
Naturally occurring radio interference (static) from the sun, aurora, lightning storms, and other atmospheric disturbances.
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.
- Legislation details the applicable directives and laws that are being ignored.
- Lighting details the issues with Compact Fluorescent Lamps (CFLs), strip-light electronic ballasts, and LED lighting.
- SMPS details problems associated with some Switched-Mode Power-Supplies.
- Plasma TV details the issues with wide-band interference from ageing plasma televisions.
- PLT links to our sister site Ban PLT and details the problems these horrid junk devices create.
- Miscellaneous details other sources of radio frequency interference.
- Finding QRM details how you can track down sources of radio frequency interference.
- Glossary contains explanations for some of the technical content of the site.
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.
Difference in noise floor (3000 Hertz bandwith) received on a 10 metre-tall vertical aerial
during and after a power outage, affecting a property radius of approximately 100 metres.
REIN or SHINE
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:
- Faulty electrical installations.
- Faulty thermostats (radiator motor/pumps and immersion heaters).
- Faulty central heating electronics.
- Domestic appliances (washing machines, dishwashers, fridges, freezers).
- Leisure appliances (TVs, satellite receiver, DTT receiver).
- Other appliances (laptops, PCs, routers, network switches, printers).
- Railway 25/50kV transmission lines and National Grid 11/33kV transmission lines.
- Electric fences, gates and other motor-driven devices.
- Christmas tree lights.
- Mobile / Temporary lighting (temporary traffic lights).
- Security systems & lighting.
- High power switching equipment.
- Data cables in close parallel proximity to power cables.
- Credit card payment machines, electronic cash registers.
- Vehicles with faulty suppression systems/electronics.
Follow our Finding QRM guide to help track down the sources of REIN or SHINE that may be lurking in your home.
Please sign an EU-wide petition against PLT to help save the radio spectrum from a technology set to cause such immense interference that it could become impossible to enjoy any form of radio. The EU need to be made aware of the problems their poor decision making and lack of market surveillence is causing.
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).
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. In 2013, the group has over 600 members, discussing all sorts of QRM issues from the UK, Europe, and Internationally.
You can read all about the problems of PLT on our sister site:
Why not join in the conversation on our forum dedicated to radio interference:
Are you a Radio Amateur, Shortwave listener, Citizens' Band radio user, EMC professional, or professional radio Engineer? Why not join our Yahoo Group to help us with our technical discussions on non-EMC-compliant electronics and their threat to the radio spectrum. Click on the icon below.
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:
- Graphical test results of the applicable conducted and radiated emissions tests, as shown on the METECC LED Lamp Investigation page.
- The name and address of the accredited test-house that carried out the EMC testing.
- The dates of the tests and how many samples were taken from the production line(s).
- A list of the applicable tests passed, e.g. EN55013, EN55015, EN55022.
- The name and address of the auditor(s) for ISO9001 registered companies.
- To place all of the above information in the public domain via prominent links on your website(s).
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.
Is your business refusing to sell PLT, Plasma televsions, and non-EMC-compliant LED lighting? Let us know and we will feature you as an ethical supplier.
UKQRM is supported by
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.
If you would like to use a logo with a transparent background, change: src="http://www.ukqrm.org.uk/logos/UKQRM-text-logo-trans.png"
Bulletin Board Code
If you would like to use a logo with a transparent background, change: [img]http://www.ukqrm.org.uk/logos/UKQRM-text-logo-trans.png[/img]
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Page updated: 1st October 2014