Just FYI, lots of newer dimmers require a minimum load to work properly… so
when u replace incandescent with led, things don’t always work good. Try all
leds except one or two regular lamps to keep a load on to test…
73- Mike - KM0T
Sent from my iPad
> On Mar 11, 2022, at 11:16 AM, Gary Johnson via RFI <rfi@contesting.com> wrote:
>
> I experienced exactly that oscillatory behavior when multiple LED fixtures
> were connected to ANY model of dimmer. The problem was induced by adding
> commercial EMI filters to each fixture. There was no time to investigate the
> exact nature of the interaction. My guess is that the switching frequencies
> of each fixture were beating against one another, which appeared as
> low-frequency cyclical changes in line voltage. The dimmer apparently
> responds to that. But it’s only a guess… A Lutron dimmer was one of three
> brands tested and all behaved the same. Ultimately, we removed the EMI
> filters and replaced them with CM chokes. Everything worked properly but the
> RFI suppression In that case was not nearly as effective as with the EMI
> filters.
>
> Here’s a detailed report on a particular Lutron dimmer:
> https://na6o.com/main/RFI_files/Lutron_Diva_Dimmer_Switch.pdf
> I found it’s RFI generation to be unacceptable on the low bands. No way to
> know if other/later versions are similar without testing.
>
> Gary NA6O
>
>> On Mar 11, 2022, at 7:30 AM, rfi-request@contesting.com wrote:
>>
>> From: Dan K2YWE <dan.k2ywe@gmail.com>
>> To: Rfi List <RFI@contesting.com>
>> Subject: [RFI] Dimmer Behavior
>>
>>
>> I just replaced a chandelier that had 5 LED candelabra base 4-element LED
>> lamps in it (the ones shaped like flames). It worked fine for years with
>> our ancient Leviton dimmer (up-down buttons and little leds) using a mix of
>> GE and Feit LED lamps.
>> The replacement chandelier has only 4 sockets. I put in the same LED lamps
>> and the dimmer just continuously cycles the lights from bright to dim. If I
>> remove one of the four lamps it behaves normally. The brand of the three
>> doesn't seem to matter.
>> If I put in a Feit in the 4th slot it stays unlighted but the other three
>> work fine. If I put a GE in the 4th slot I get the cycling behaviour. An
>> incandescent 4th lamp makes everything work normally.
>> Clearly the old dimmer can't handle the 4 LED loadline.
>> I need a recommendation for a modern LED friendly dimmer that is known to
>> be EMI-Free, I operate 160m-6m.
>> 73, Dan
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