[Antennas] Radials

Sat Apr 18 08:47:58 EDT 2015

Thanks, Doug.
The 160 wire is about a foot off the tower on PVC pipe stand offs. It's fed with about 6 feet of coax from a remote switch, so one end of the coax is connected to the tower. The braid on the end that connects to the wire in open.

The 80 sloper is supported at the top by a metal bracket with a SO-239 connector on it. The braid if the coax is one with the tower, the wire is connected to the coax center conductor.
73, Mike NF4L

> On Apr 18, 2015, at 08:32, Doug Renwick <ve5ra at sasktel.net> wrote:
>> 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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