Quote:
Originally Posted by Dave A
Would this work to reduced lamp dimmer interference? This is outside of my wheelhouse of knowledge. This sounds like a nice little wall-wart sized module project.
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The effects on the BCB from a standard rotary incandescent lamp dimmer, generating line harmonics from Triac and SCRs, should be reduced by this filter.
I used an integrated (grounded) line cord receptacle combo with M-derived filter from a CRT monitor. The 1937 Philco I put it in needed the chassis grounded anyway and it trapped almost all of the line hash, leaving the band nice and open at night.
With fluorescent lights using an SMPS as the electronic ballast , its more of an issue with HF, VHF and FM bands. Much of that interference is radiated from the lamps, not via power line. separation from and nullification with antenna placement helps.
The absolute worst offenders I found were the higher-wattage compact fluorescents operating on electronic ballasts (commercial twin and quad tube 18-42 watts) yet residential screw-in spiral types seem harmless.
The second worst offenders are the three and four-lamp electronic ballasts (2,3 and 4 foot T8 lamps) likely due to higher harmonic current drawn like the twin/quad tube compacts. Two lamp units, even with 8-foot tubes, are not too offensive.
I took great care in selecting "can" and "bowl" lighting for halls and parlors in retirement homes, thinking primarily of the residents that lived there. All the lighting supply houses and even ballast manufacturer reps were ignorant of this issue. I made sure they did when specifying.
I have found that the emission from rapid-start and trigger start magnetic fluorescent ballasts (older T12 lamps) is minimal and only a problem if the fixture is not properly grounded. cheers for old technology
