Re: [TCML] Treating RF feedback

[<pterren@xxxxxxxxxxxx>]

If you have a wire straight to earth ie only a few feet long it is probably 
OK. Mine is 20 foot long as it has to run to the edge of a large bitumen 
parking area.
Without a counterpoise I get sparks jumping in all sorts of places like 
primary to secondary, strike rail to primary and my protection gaps.

My briefcase coil has the chassis inside the case as counterpoise plus mains 
earth, preferably with my voltage isolating transformer.
An earlier small tabletop coil had an aluminium sheet under it to reduce the 
mains earth being an RF earth.
Peter
Tesladownunder.com

-----Original Message----- 
From: Mark X2
Sent: Thursday, March 21, 2013 11:05 PM
Peter,

you wrote
Use a counterpoise if there is any doubt about the earth adequacy.

What's the best way to check this?

When I was busy with my dedicated HF ground, I simply measured the
resistance between this HF ground and the blue neutral wire in the nearest
wall socket.  It measured somewhere between 50 and 200 kOhm, being a bit
dependant of the weather.

Mark

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