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Re: [TCML] Thumping Water Pipes

Years ago while operating a very powerful ham radio transmitter I got RF into the furnace control circuits. The furnace relays clunked on and off with modulation. Possibly you are getting RF or voltage spikes into a dishwasher or washing machine and causing the water inlet solenoid to open and close, thumping the water pipes.

Charlie K3YA

-----Original Message-----
From: Dave Leddon <dave@xxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Mon, Mar 15, 2010 11:32 am
Subject: Re: [TCML] Thumping Water Pipes

At 04:04 AM 3/15/2010, you wrote: 
>...  The discharge from the coil 
> was striking a ground pole which was connected to a ground rod
> through the cement floor about one foot from where the water supply 
> exits the ground and enters the garage.  When I grounded the strike 
> pole to a different ground rod on the opposite side of the garage, 
> the effect was greatly diminished, so I'm guessing that current 
> passing through the pipe creates a magnetic pulse which reacts to
> earths magnetic field but I thought that I would ask the experts
> a more definitive answer. 
    I would think not the Earth's field, as such, as this is 
    quite weak.  Rather: enough current in a conductor can 
    change its size/shape: cf nagnetostriction 
But I thought that magnetostriction was a property that applied only to ferromagnetic materials and in my case the all of the pipe involved is copper. 
    This can result in audible effects. 
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