Re: [TowerTalk] There's 'ground', and then there's 'ground'

[Gary Schafer <garyschafer@comcast.net>]

Yes the main reason for keeping them away from the foundation is to keep 
them in a more moist ground. The ground tends to be much dryer under the 
eves of the house.

Concrete is not a bad lightning conductor but the foundation wall of a 
house with a basement will be rather dry.

Lightning is in the range of DC to around 1 mhz so it is not high 
frequency energy for the bulk of it although some of it does extend 
higher. Moist ground is a requirement for a good lightning ground.

73
Gary  k4FMX

David Robbins K1TTT wrote:
> That is a convenient way to say 'keep them away from the foundation'...
> moisture helps for low frequency and low current grounding where ion
> conduction is the main conduction method, but does almost nothing for high
> frequencies or lightning.
>
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://www.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
>  
>
>
> > -----Original Message-----
> > From: Alan NV8A (ex. AB2OS) [mailto:nv8a@att.net]
> > Sent: Monday, January 17, 2005 17:00
> > To: towertalk reflector
> > Cc: David Robbins K1TTT
> > Subject: Re: [TowerTalk] There's 'ground', and then there's 'ground'
> >
> > I have read that the ground rods should be out from the eaves,
> > presumably (my guess) because the ground there will stay moister.
> >
> > Alan NV8A
> >
> >
> > On 01/17/05 11:38 am David Robbins K1TTT tossed the following
> > ingredients into the ever-growing pot of cybersoup:
> >
> >
> > > Depending on the spacing of the 2 existing rods you could reduce your
> >
> > ground
> >
> > > impedance by 50% or more with 2 more rods.  Maybe a LOT more depending
> >
> > on
> >
> > > the exact geometry of the situation.  Lots of people make a big mistake
> >
> > by
> >
> > > driving a rod right next to the foundation, you should note that this
> > > reduces the effectiveness of the rod because half of the circle around
> >
> > it is
> >
> > > cut off by the foundation forcing all the current to go in only one
> > > direction.
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
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_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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