One thing observed at our repeater location is that the CFL was quiet until the the transmitter was on the air. It then generated noise. In a simplex condition it wouldn't be observed. But in a duplex operation or multiple receiver situation it becomes an issue. Replaced by a LED with lessened issues.
Bob, K4TAX Sent from my iPhone > On Oct 21, 2017, at 11:21 AM, Jim - N4ST <hamsh...@n4st.com> wrote: > > I have noticed the background noise level growing on the HF bands, and for > me, especially on 18 Mhz. I need to declare war on RFI and find out what is > causing this. I did carefully checkout some Walmart "100 W" LED lights > before committing to them and they were fine. > > > _________ > > 73, > > Jim - N4ST > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bob McGraw K4TAX > Sent: Saturday, October 21, 2017 11:32 > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] OT: LED Light Bulbs > > 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 > > > ______________________________________________________________ > > > Elecraft mailing list > > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > > Help: http://mailman.qth.net/mmfaq.htm > > > Post: mailto:Elecraft@mailman.qth.net > > > > > > This list hosted by: http://www.qsl.net Please help support this email > > > list: http://www.qsl.net/donate.html Message delivered to > > > rmcg...@blomand.net > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html Message > delivered to hamsh...@n4st.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
