[GreenKeys] RF noise

[Kind Sir Andy ....]

I think this may be an OT thread that may be easily filtered

at the test equipment end... 

and /or  maybe a small "grounded screen room" be built  to

alleviate the hash.... Never knew Greenkeys eq needed such sensitivity

even when working on the low level equipment

thus the "DEL" key.... 



 Andy 


 

> From: c.sawyers at tech-enterprise.com
> To: greenkeys at mailman.qth.net
> Date: Tue, 7 Apr 2009 19:12:08 +0100
> Subject: Re: [GreenKeys] RF noise
> 
> > Compact Fluorescent Lights are here to stay because they are
> > "good for the environment" (despite the mercury content and
> > disposal issues when they quit working).
> 
> Typically CFL's seem to have a mercury content of about 1.4 milligrammes -
> at least the Philips ones do - independent of power rating from 8W to 33W.
> Of course all fluorescent lights have mercury in them - the long tubular
> type have quite a lot, much more than a CFL, and are used in huge quantities
> (The UK consumed 55 million tubulars in 2007!).
> 
> If a CFL has a life of 10,000 hours and is used for 3 hours a day average.
> That is 10 years life. Now suppose a house uses 10 such lights - each house
> will be responsible for 1.5 milligrams of mercury per year. In the UK we
> have about 25 million houses. Assuming that every single house uses 10
> CFL's (a gross overestimate), that would produce 37.5 tonnes of mercury
> waste per year - less than 5% of that from tubular fluorescents.
> 
> So the use of mercury in a domestic lighting product is a media emotive
> topic only.
> 
> Far more significant is the hash that they sqirt out over everything from
> high audio through to VHF.
> 
> Craig
> 
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