[TowerTalk] Fwd: [Bulk] Re: [Bulk] Re: RF Ground is a Myth

[Hans Hammarquist via TowerTalk]

You can test the conductivity of a concrete floor just by touching a hot wire while standing barefoot on the floor. How do i know? Don't ask.


Hans - N2JFS



-----Original Message-----
From: Grant Saviers <grants2 at pacbell.net>
To: Brian Carling <bcarling at cfl.rr.com>
Cc: towertalk <towertalk at contesting.com>
Sent: Tue, Jan 20, 2015 10:22 pm
Subject: Re: [TowerTalk] [Bulk] Re:  [Bulk] Re:  RF Ground is a Myth


You might consider why building codes now require all outlets over bare 
concrete to be GFI protected.

Grant KZ1W


On 1/20/2015 4:22 PM, Brian Carling wrote:
> I suspect it's not as conductive as some may have us think...
>
> Best regards - Brian Carling
> AF4K Crystals Co.
> 117 Sterling Pine St.
> Sanford, FL 32773
>
> Tel: +USA 321-262-5471
>
>
>
>
>> On Jan 20, 2015, at 1:22 PM, David Robbins <k1ttt at verizon.net> wrote:
>>
>> just remember when you do it to not use the point of an ohm meter probe.... 
it is not easy to measure bulk material resistivity like in soil or concrete or 
other types of materials.
>> you need to have some relatively large surface area to contact the material, 
which is hard to do with already poured concrete.
>>
>>
>> Jan 20, 2015 12:59:36 PM, bcarling at cfl.rr.com wrote:
>>
>> So far I am not convinced about using concrete. I'm going to do some 
resistance testing on the concrete in my yard.
>>
>> Best regards - Brian Carling
>> AF4K Crystals Co.
>> 117 Sterling Pine St.
>> Sanford, FL 32773
>>
>> Tel: +USA 321-262-5471
>>
>>
>>
>>
>>> On Jan 20, 2015, at 10:13 AM, Grant Saviers wrote:
>>>
>>> If your house slab was installed correctly with a vapor barrier and/or foam 
insulation, then it is insulated electrically from earth.
>>> Tower bases make good Ufers as do perimeter foundations, so my towers and 
shop both had the rebar set as Ufers when constructed.
>>> I also noticed that a new service transformer I had installed is set on a 
concrete vault that has a ground stub cast into the side. The power company used 
it, no ground rods. I'd estimate its surface area in contact with earth as more 
than 16 sq ft. Compare that to less than 2 sq feet for a 10' 3/4" ground rod.
>>>
>>> Grant KZ1W
>>>
>>>
>>>> On 1/19/2015 6:52 PM, Mike Reublin NF4L wrote:
>>>> The electrician I had (who does a LOT of grounding work here) come out to 
connect my tower ground to the service ground told me he would be glad to drive 
the extra rods extending out from the tower, but doing so would add no benefit 
at all. I have no idea if this is true or not. At some point, lacking personal 
knowledge, ya have to take someone's word for it. My tower megged out at 4 ohms.
>>>>
>>>> Mike NF4L
>>>>
>>>>> On Jan 19, 2015, at 8:29 PM, Brian Carling
>> wrote:
>>>>> The advice varies about this considerably. This week is the first time 
I've even heard of UF ER or conductive concrete!
>>>>>
>>>>> The professional experts that I know recommend putting a 20 to 30 foot 
ground rod into the ground at each corner of your house and connecting heavy 
gauge copper conductors up to lightning rodsup on the roof.
>>>>>
>>>>> It seems like if the only thing you need is a large area of this allegedly 
conductive concrete stuck in the ground, why not ground everything to the 
concrete slab your house sits on!!
>>>>>
>>>>> Best regards - Brian Carling
>>>>> AF4K Crystals Co.
>>>>> 117 Sterling Pine St.
>>>>> Sanford, FL 32773
>>>>>
>>>>> Tel: +USA 321-262-5471
>>> _______________________________________________
>>>
>>>
>>>
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