I completely understand the minimum load problem and it came to mind
immediately, but I assumed it was because of the old design. I'll be quite
dismayed if a new dimmer has the same problem. Sheesh!
73, Dan
On Fri, Mar 11, 2022, 12:22 PM Mike King - KM0T <scsueepe@mtcnet.net> wrote:
> 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
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
>
>
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