Re: [TenTec] RF Ground

["Bob McGraw - K4TAX" <RMcGraw@Blomand.net>]

I agree Ron.

I believe that 1/2" copper pipe as a bond conductor is adequate for most 
situations.  The 1/2" refrigeration line is soft and flexible and can be 
obtained in 100 ft to 250 ft coils more or less.  It can be flattened to 
about 1 " wide for easy connections.  It's still expensive.
73
Bob, K4TAX




----- Original Message ----- 
From: "Ron Castro" <ronc@sonic.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, April 06, 2009 10:41 AM
Subject: Re: [TenTec] RF Ground


> I think 18" is overkill.  In the broadcast industry we use 4" strap, which
> considering today's cost of copper is very expensive.
>
>           Ron  N6IE
>       www.N6IE.com
>
> ----- Original Message ----- 
> From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
> To: <Gary@doctorgary.net>; "Discussion of Ten-Tec Equipment"
> <tentec@contesting.com>
> Sent: Monday, April 06, 2009 7:23 AM
> Subject: Re: [TenTec] RF Ground
>
>
> > Gary:
> >
> > Here's what Jerry had to say and I agree:
> >
> > quote:
> >
> > If you really want lightning and RF grounding, those ground sources need
> > to be connected together with wide  copper strap. 18" is a nice width.
> > Otherwise the inductance is too much to be totally effective.
> >
> > 73, Jerry, K0CQ
> > end quote:
> >
> > The 18" copper strap that Jerry suggests would be nice but would also be 
> > a
> > nice investment today.
> >
> > In my case I use a piece of 1/2" copper refrigeration tubing to
> > connect/bond
> > [actually via CAD WELD} all of my driven grounds.   There's 3 at the base
> > of
> > the tower in a ring and 1 at each corner of the house.  The house has a
> > series of lightning rods across the top.  All of these points are
> > connected
> > together.  Also, the mast out the top of the tower has 2 bonding flexible
> > straps between the mast and the tower sleeve.  This assures that the mast
> > is
> > bonded to the tower and the path is not through my rotor.
> >
> > Yes, in your case, the path between your service ground and your antenna
> > ground is through your station equipment via the coax.  Not good!
> >
> > 73
> > Bob, K4TAX
> >
> > .
> >
> > ----- Original Message ----- 
> > From: "Gary Smith" <Gary@doctorgary.net>
> > To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> > Sent: Monday, April 06, 2009 5:05 AM
> > Subject: Re: [TenTec] RF Ground
> >
> >
> > > Hi Bob,
> > >
> > > My antennae use the same radial field of 60 or so 130' radials. The
> > > radial plate is 360' from the house. The only connection between the
> > > house and the radial field is via the coax shield. Are you suggesting
> > > I run a length of additional wire from one of the radials to the
> > > grounding point of the service entrance ground rod?
> > >
> > > Gary, KA1J
> > >
> > > > As to having a RF ground,  a ground radial system below your antenna is
> > > > the
> > > > reference point for that antenna.  Several antennas can share the same
> > > > radial system.  Also that radial system must be bonded back to the
> > > > service
> > > > entrance ground.
> > > >
> > > > 73
> > > > Bob, K4TAX
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