Brightness in LEDS is controlled by pulse-width modulation. Ever see a
slo-mo film of a car with LED lights? They appear to be flickering. It's
the pulsing of quite some amps that causes the electromagnetic interference.
On 24 October 2015 at 19:49, ChrisB <ftog@xxxxxxxxxxxxxx> wrote:
> I talk about LEDs quite a lot at work, Paul, in the context of using
> NVGs. Many airports and obstructions are now lit with LEDs with core
> wavelengths below 650nm. There are filters in NVGs at that wavelength, for
> specific reasons, so the lights don’t show very well – unless they are
> cheapo LED which have a wider spread of wavelengths, I believe.
> I wonder therefore if the cheapo LEDs are the ones that transmit and jam
> your radio frequencies.
> > On 24 Oct 15, at 19:21, Paul Braun <pbraun42@xxxxxxxxx> wrote:
> > I need to be careful with alternative lights - some, especially some
> LEDs, put out an awful broadband RF hash that all but kills the 2-30 MHz
> ham bands.
> > I've been trying a few here and there.
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