From: Rik Strobbe <rik.strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: Touch switched lamp influenced by lf/mf transmission
Thread-Index: AQHReuBpDvtW6fvQm0ilNXZEkVUcLJ9S/peAgAARgwCAABB8AIAAHzk5
Date: Thu, 10 Mar 2016 22:20:36 +0000
Message-ID: <7E7DFBB4D102A04DB5ADC88D66628A4A444E0A40@ICTS-S-MBX1.luna.kuleuven.be>
References: <56E18E66.7010809@t-online.de>	<56E1CA13.9090805@t-online.de>
 <CAFDVXLnS5E-4Zx6ULX_HXPCWJdEbCYqgLYMTibH8EDmhRZUJLw@mail.gmail.com>,<56E1E698.7070505@posteo.de>
In-Reply-To: <56E1E698.7070505@posteo.de>
Accept-Language: nl-BE, en-GB, en-US
Content-Language: nl-BE
MIME-Version: 1.0
Subject: RE: LF: Touch switched lamp influenced by lf/mf transmission
Content-Type: text/plain; charset="us-ascii"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Content-Transfer-Encoding: 8bit
Status: O

Hi Stefan,

that might do the job, but I'm not sure of the combination "very expensive lovely designer lamp" and "aluminium foil" ;-)

73, Rik  ON7YD

________________________________________
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens DK7FC [selberdenken@posteo.de]
Verzonden: donderdag 10 maart 2016 22:26
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: Touch switched lamp influenced by lf/mf transmission

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:
> Chris,
> 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.
> Regards
> Lawrence
>
> On 3/10/16, Dr. Wolf Ostwald<df2py@t-online.de>  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
>>> 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
>>>
>>> dl7saq
>>>
>>>
>>
>>
>