[RFI] Switch mode lamp noise

[Hare,Ed, W1RFI]

Martin,

What manufacturer model number? If they are avialable in the US, I want to test them to see if they comply with the FCC conducted emissions limits.

Are they CE marked?

73, 
Ed Hare, W1RFI
ARRL Lab
225 Main St
Newington, CT 06111
Tel: 860-594-0318
Internet: w1rfi at arrl.org
Web: http://www.arrl.org/tis

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> -----Original Message-----
> From: Martin Sole [mailto:msole at loxinfo.co.th]
> Sent: Thursday, February 06, 2003 9:32 AM
> To: rfi at contesting.com
> Subject: [RFI] Switch mode lamp noise
> 
> 
> When we moved into our house I had some nice halogen spot lamps fitted
> in the shack. Didn't realise at the time that these things have a
> switching supply to produce the 12 volts for the bulb. With only a
> single one fitted to the track it produces enough rubbish to wipe out
> everything from top band through ten. Antennas are outside 
> 100 foot away
> fed with coax.
> 
> They are a very simple design, recified household supply powers an
> oscillator which is then transformed down to 12 volts. Scope shows a
> nice 11KHz sqare wave. These things are two wire only, no ground.
> 
> Is there anything I can do to get rid of the noise, short of either
> replacing them or fitting a 20 amp DC supply in the attic?
> 
> 73's
> Martin, HS0ZED
> 
> 
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