[Elecraft] OT: LED Light Bulbs

[Gary Smith]

Something to consider is what noise is 
coming in on the cable after you pull the 
breaker on the house. I did that and found 
the AM portable went nuts next to the 
breaker box. Found the noise is coming in 
off of the cable lines. Zero luck with the 
cable company...

Just sayin'

73,

Gary
KA1J

> Makes me wonder if at all or how frequently production lots are 
> evaluated to determine if they are in FCC Part 15 compliance.
> 
> Otherwise, the approach "we evaluated one production lot, deemed it
> passed" {a.k.a - I saw it work once, ship it}  and then produced a
> million or so afterwards including those with some engineering changes
> and cost down changes.
> 
> Guess I need to power the radio from the tractor battery and dump the
> main breaker in the house to see how much the noise changes.
> 
> 73
> 
> Bob, K4TAX
> 
> 
> 
> On 10/21/2017 9:48 AM, w4sc wrote:
> > An observation:
> >
> > I too had RFI from LED lights, but the interference was to OTA
> > television, Channel 10 (192-198 MHz) DTV.
> >
> > Not all LED bulbs are created equal in this regard, RFI reduction /
> > elimination.  The RFI was generated in this case by the SMPS
> > integral to the bulb.
> >
> > The offending bulb is Utilitech part # 5DG6 (printed on the bulb)
> > and is `C  UL  US´ listed, purchased from LOWEs.
> >
> > I have a overhead fixture that was populated with four 800 lumen
> > (60w?) bulbs, 2 being Utilitech, and 2 Sylvania OSRAM.
> >
> > By removing the bulbs and observing channel 10 reception, the
> > offending bulb was determined to be the Utilitech.
> >
> > I replaced the the the Utilitech bulbs with Sylvania OSRAM, and the
> > RFI on channel 10 OTA was eliminated.
> >
> > The Sylvania OSRAM part number used is LED8.5A19/DIM/0/827/G5/RP as
> > printed on the box UPC, and were purchased from LOWEs also.
> >
> > NOTE: There may be interference from Sylvania OSRAM bulbs on other
> > frequencies.  LED bulbs are required to meet FCC Part 15 FCC, Class
> > B regulations.
> >
> > YMMV
> >
> > I have not seen a comprehensive report or article that unveils
> > "good" vs "bad" LED bulb manufacturer and part
> > identification as far as RFI emissions across the spectrum.
> >
> > Ben W4SC