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LF: Re: Touch switched lamp influenced by lf/mf transmission

To: <[email protected]>
Subject: LF: Re: Touch switched lamp influenced by lf/mf transmission
From: "Alan Melia" <[email protected]>
Date: Thu, 10 Mar 2016 15:52:35 -0000
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Hi Chris I doubt it. It sounds like an internal mod would be required.....definitely a no-no unless it is your own unit. If it is possible to supply some more detail i.e. make and model, I would like to pass this to the RSGB  EMC committee, more for information than anything I doubt we can do anything about it. It is basically a sensitive unit, its not really "non compliant" with the regs, I think, as there is no spec below 150kHz. The problem is the touching body acts as an aerial.
----- Original Message -----
From: christoph
Sent: Thursday, March 10, 2016 3:10 PM
Subject: LF: Touch switched lamp influenced by lf/mf transmission

Dear all,

my neighbour uses a very expensive lovely designer lamp switched by a four step touch switch. Unfortunately that switch follows keying of my mf transmitter. Is there somebody having experience with that kind of malfunction?

The distance to the antenna feeding point is approximately 16m (ANT voltage app. 2.5kV). I tested a chain of eight common mode chokes in series to the affected lamp (mains separation of more than 100kOhms at the desired frequency). That showed improvement in sensitivity but the switch did not work anymore during transmission. The most effective solution is replacing the touch switch by a normal dimmer.

Are there better ideas to keep in use the original touch switch?

73, Chris


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