Re: [TCML] Thumping Water Pipes

[cbroring@xxxxxxx]

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 
driven 
> > 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 
the 
> > earths magnetic field but I thought that I would ask the experts 
for 
> > 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. 
>  
>     best 
>      dwp 
>  
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