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[TowerTalk] Unique RFI/Grounding system

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Subject: [TowerTalk] Unique RFI/Grounding system
From: (Steven Gehring)
Date: Mon Jun 2 18:44:50 2003
Hi Mark,

Do a search on the internet (Google) for what is called a UFER Ground.
There are many hits on this type of cement foundation grounding method.  I
hope this helps...  

Besides following the NEC, I'd like to employ this method the next time I
build a new house.  I suppose this UFER ground could be bonded to the
building ground and a single point ground panel.  

Good Luck,  

Steven J. Gehring, KZ9G
Bothell, WA 

-----Original Message-----
[] On Behalf Of Mark Pride
Sent: Sunday, June 01, 2003 6:13 PM
Subject: [TowerTalk] Unique RFI/Grounding system

Any fellow TTers recall reading the article years back (think in Ham Radio
Magazine?) about taking advantage of the concrete in the basement floor to
create a capacitor that provides a high frequency path to ground for RFI/TVI
suppression?  Built a shack in the basement years back where I took the
suggestions of the author and placed about 50 sq. ft. of conductive material
flat on the surface of the concrete then built a floor over it (2X4, plywood
with insulation) to hold it down and ran a wide conductor to this surface
and ultimately connected to the station ground.  Although I did not do much
comparison work (conventional grounding in the shack (single point ground)
vs. connection to this conductive surface under the floor), I did experience
a pretty quiet environment during multi transmitter operation.  The
interstation interference was very good and now looking to re-create this
method again or read the article again to reconfirm the value points of such
an installation.  The claim was that by using the capacitor created by
taking advantage of the dielectric associated with  the concrete worked to
make a nice low pF value capacitor that could shunt off high frequency
energy, reducing TVI or RFI.

My guess is this article appeared in the amateur press 15 years ago.

Would appreciate any leads for this article.  Thanks!


Mark, K1RX


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