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

To: [email protected]g
Subject: Re: LF: Touch switched lamp influenced by lf/mf transmission
From: DK7FC <[email protected]>
Date: Thu, 10 Mar 2016 22:26:48 +0100
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Another idea may be to shield the switch with bonding aluminium foil arround the switch. Connect the foil to earth (PE), if a PE wire is available inside the switch. A small field must stay free, to lay the finger on and turn on/off the switch, but the rest could maybe be protected?
73, Stefan

Am 10.03.2016 21:27, schrieb Lawrence Galea:
If the neighbour accepts and the lamp uses an earth and there is space
inside the lamp you can try a couple of capacitors from both sides of
the mains to earth, shunting the rf picked up to earth.
You can also include a capacitor across the mains, all inside the lamp.
Of course all capacitors should be suitably rated.

On 3/10/16, Dr. Wolf Ostwald<[email protected]>  wrote:
hi Chris !
You need an E-type ferrite core to put the 230v cord in. This will kill
the sensitivity to Your tzransmitted  RF.
CQ-DL shop once had them, if You cant get any, just contact me

wolf df2py

Am 10.03.2016 um 16:10 schrieb christoph:
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

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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