[Antennas] Radials

[Doug Renwick]

Lightning concrete damage is mostly old wives tales.  An Ufer ground is an
effective lightning grounding system.
You don't tell us if the 80 and 160m antennas are physically attached to the
tower, are part of the tower.  That makes a difference.  I have 160m half
slopers off one of my towers and I do run a few radials.  Whether that makes
any difference I don't know, but if apparently doesn't hurt the system as
far as I can tell.
Doug

----Original Message-----


Do yourself a favor...Google "lightning concrete damage" ...get the
lightning off the tower by other means than THRU the concrete.

Richard


Hi Richard - 
   
 
According to the electrician, whose company does a lot of grounding work
here, rods would add nothing to the protection afforded by the Ufer ground.
But that wasn't the question. 
 
   
73, Mike NF4L 

-----Original Message-----
From: Mike Reublin NF4L <nf4l at comcast.net>
To: Riichard Neuman <secopsys at aol.com>
Sent: Fri, Apr 17, 2015 9:03 pm
Subject: Re: [Antennas] Radials


Hi Richard - 
  
 
According to the electrician, whose company does a lot of grounding work
here, rods would add nothing to the protection afforded by the Ufer ground.
But that wasn't the question. 
  
 
73, Mike NF4L 
 
   
    
On Apr 17, 2015, at 20:51, Riichard Neuman <     secopsys at aol.com> wrote:

    
    
     You want to get the possible lightning strike off and away from each
leg before the concrete.   Clamps on each leg with heavy duty gently
sweeping wires out to driven ground rods...one at each leg driven into the
ground NOT thru the concrete.  In addition possibly further ground rods
heading away from each leg.
            
      
-----Original Message-----       
 From: Mike Reublin NF4L <       nf4l at comcast.net>       
 To: antennas <       antennas at mailman.qth.net>       
 Sent: Fri, Apr 17, 2015 8:04 pm       
 Subject: [Antennas] Radials       
         
I have a 70' tower with an inverted-L for 160M and a 1/4 w sloper for 80M.
The
tower base has 8 yards of concrete and a lot of rebar. There are 3 #4 copper
wires, with one end attached to each tower leg, then into the concrete,
attached
to the rebar then exits the concrete just under ground. 

The original plan
was to put 3 ground rods along each wire. My electrician told me that as far
as
safety grounding goes, there was no benefit. The tower/base megged at 4
ohms.

The wires are currently rolled up at the base of the tower. If I
straighten them out and staple them to the lawn, do they then act as
radials?
Would it be feasible to attach more radials to these where they emerge from
the
concrete, so as to avoid having the top of the concrete pad awash in
wire?

73, Mike
NF4L
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