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Re: [TowerTalk] RF int makeup mirror

To: jimlux <jimlux@earthlink.net>
Subject: Re: [TowerTalk] RF int makeup mirror
From: Jim Rhodes <jimk0xu@gmail.com>
Reply-to: jim@rhodesend.net
Date: Wed, 7 Mar 2018 13:18:59 -0600
List-post: <mailto:towertalk@contesting.com>
Have you considered converting it to a regular switch and taking out the
electronics? If there is room for a push button switch on it somewhere it
would solve TX and 3rd issues.

Jim Rhodes
K0XU

On Mar 7, 2018 12:39 PM, "jimlux" <jimlux@earthlink.net> wrote:

> On 3/7/18 9:55 AM, David Gilbert wrote:
>
>>
>> Yes ... they are basically a transmitter and the interfering RF is likely
>> radiated, rather than solely conductive.  Not much he can do other than
>> turn the bedroom/bathroom into a Faraday cage.   Or turn the ham shack into
>> a Faraday cage, but even that wouldn't help if his antennas are close
>> enough to pick up the signal.
>>
>> For the mirror to be messing up multiple bands the oscillator must be
>> generating something akin to a square wave.  If it were possible to access
>> the circuitry maybe trying to filter it to something closer to a sine wave
>> would cut down on the harmonics.
>>
>>
>
> we stray from Towers here...but..
>
> Modern touch sensors also use the change in amplitude of received 60 Hz
> line frequency - the problem is that they're cost driven, so basically,
> what they have is a broadband power detector, followed by a AC coupled
> thresholder.  Your RF gets detected, making it think that there's an
> increase in signal level.
>
> Or, they periodically send a burst of pulses to the sensing plate, and
> look for a change in impedance.
>
>
>
> https://www.mouser.com/ds/2/268/40001948A-1145202.pdf
> Microchip AT42QT1012
>
>
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