[RFI] CFLs and LEDs

Roger (K8RI) k8ri at rogerhalstead.com
Wed Nov 12 18:13:55 EST 2008

George Gorsline VE3YV wrote:
> FWIW - I have CFLs throughout the house and also at the cottage.  No 
> issues with RFI, but as noted cold start in the winter (before the wood 
> stove heats the cottage up) will give you slow firing and gradual 
> increase to normal brightness.  They're getting nicer now that warmer 
> temperatures (colours) are available.  Early purchases didn't have good 
> life - lots of premature failures.  Note that the fine print says that 
> they aren't to be installed in enclosed ceiling fixtures - where most of 
About half of the 20 we have installed are either in ceiling fixtures of 
fully enclosed in glass globes. Nary a problem with heat of premature 
failure after the early ones.  The one here in the den is fully enclosed 
in a glass globe under and attached to a ceiling fan (Probably a worst 
case). I went according to the actual power used, and not equivalent 
when  it came to the fixture power limit. No problems for several years 
although the light is slightly warmer (color) that it was when new.

There are two computers, my network router and switch (Gigabit CAT5e) 
with runs to 5 computers, two USB printers, two USB scanners, and the 
CFL in the ceiling.  This computer is inches from the TMD-710 control 
head. The remote mounted RF deck is next to the other computer and the 
connecting cable runs along with the CAT5e.  Normally the 756 Pro sits 
next to that remote RF deck.  Two runs of the CAT5e make the 130 foot 
run to the shop parallel and only a few feet from the cables to tower.  
Likewise in the shop the station sets adjacent and inches from the 
computers.  The computer in the shop connects to the Icom interface 
which ties the rig and amp together.

So far, no problems with RFI from the stuff in the shop or house.


Roger (K8RI)
> my failures have been.  Surprising given much lower heat buildup versus 
> incandescent.  Would prefer to use LEDs when the price comes down as 
> while CFLs have lower energy consumption, they create a mercury disposal 
> problem.
> LED Christmas lights seem to be RF quiet - at least relative to the 
> existing noise floor of downtown living.  And in Toronto, the hydro 
> (power) company gives them away free every year - one string for every 
> two of the old style turned in.  The one LED RFI problem I've observed 
> is probably a crummy power supply design in flashing "DON'T WALK" 
> countdown LED displays at some intersections in the downtown core.

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