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
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Newington, CT 06111
Tel: 860-594-0318
Internet: w1rfi@arrl.org
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> -----Original Message-----
> From: Martin Sole [mailto:msole@loxinfo.co.th]
> Sent: Thursday, February 06, 2003 9:32 AM
> To: rfi@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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