Anatomy of a Philips LED Light

So, what’s inside one of these lights that has the potential to create so much HF interference?   We opened up a common Philips 10W lamp with an angle grinder to see what makes it tick.   There are fourteen LEDs wired in series, with a likely working voltage of around 35V.  However, the actual voltage […]

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LED Lights – Test Results

Some of the most common RF noisy products around the house are LED downlights.  We have had reports of banks of LED lights (60+ lights) causing QRM for HF radio at distances of up to 400 metres.   Plenty of retailers sell LED lights of various brands, but it is almost impossible to tell if these […]

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Using Chokes & Filters to suppress noise – a great reference

A VK6 member found this very useful reference on noise suppression.  Full acknowledgements to G8JNJ. Whilst this document has been written from a UK perspective, it is very useful for: noise suppression in consumer appliances & switch mode power supplies reducing noise in the shack using ferrite rings to suppress noise understanding RFI G8JNJ Notes […]

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Noisy fluorescent lights

Here is an example of fluorescent light RFI; thought to be RF quiet, but in reality far from amateur radio friendly.  Even though the observed noise on the radio was low, this is an example of “just another” noise source adding to the overall rise in the noise floor.     Key words: Fluro lights

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LED Lights – Recommendations from Hams

The following LED lights items have been reported as amateur radio friendly by VK Hams.  QRM.guru and the developers are unable to independently verify these products and have published these recommendations in good faith. During tests conducted in December 2019, the following products from five different manufacturers resulted in a clean bill of health. Other […]

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Locating noise in your home

If your noise source is limited to your home (and property) then you’re in luck.  You have much greater control over how the noise can be resolved. Follow this simple procedure to locate the noise. Power your receiver with a 12v battery so you’re independent of the mains supply You can start by turning off […]

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Consumer Electronics

We are overrun with RF radiating consumer electronics.   They have invaded every part of our domestic, commercial, manufacturing and automotive lives.  Globalisation of product markets has had a marked negative impact on compliance standards and quality contol. We are surrounded by so much of this equipment that it has become ubiquitous; to the extent […]

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