On Mar 16, 4:39*pm, "Burr" wrote:
"dave" wrote in message

...

garthpdm wrote:
Hi,

I am wondering what limitations are on the length of the ground wire
lead from the transformer/balun to the ground rod? *Thanks,

Garth

There is no requirement to to ground the BalUn (UnUn) directly. *The
antenna lead (coaxial cable outer conductor) must be grounded at the point
where it enters the building. *That is where the main ground should be..
-
- You can also carry away EMF by wrapping gnd around
- your wire NOT on the bare wire, just close as a bleed.
-
- Burr

OK So you have a Noisy AC Mains Ground; and that's all
the Ground you got.

Situation : You are stuck with only using the AC Mains Ground
in your Seventh Story Apartment / Condo : It is 84+ Feet down
to the Earth {Ground} and You Cna't Get There. - Bummer ! ;-{

1 - Use the Cold Water Pipe or AC Mains Ground as your
Radio/Shack's Grounding-Point.
-ps- Try them Both and also try the Outside Looking "Metal"
Window Frames of your Apartment / Condo many times they
are a better Grounding Point then either the Cold Water Pipe
or AC Mains Ground {There is a Reason and a Rational for
that : Anyone know both ?}

=BUT= I Got Noise coming into my Radio / Receiver from
my Grounding Point.- Bummer Again ! ;-{

First try One or more Snap-On Ferrite Beads in your
Ground Wire run from the Grounding-Point to your Radios
and Equipment.
http://linearparts.com/images/FCL-2-420x315.jpg
http://www.intermark-usa.com/product...CK_shohin2.jpg

2 - Alternattive to Snap-On Ferrite Beads is a Donut Magnet.
http://www.skycraftsurplus.com/ProductImages/sk1979.jpg
Route the Ground Wire through the Donut Hole several
times and space the Winding out around the outer-edge
of the Donut Magnet; usually 5~6 Wraps will do.
http://www.amalgamate2000.com/radio-...dio/image8.gif
http://www.regionalmfg.com/component...inductor-5.jpg

3 - OK -but- I ain't got no Snap-On Ferrite Beads; then a
12" piece of ReBar {Solid Iron Object} with the Ground Wire
wrapped around the ReBar every 1/2"~1" {10~20 Turns}
may help to kill the Noise heard on your Radios coming f
rom the GroundingPoint. - http://en.wikipedia.org/wiki/Rebar
http://www.sanantoniohams.org/images...p/1st_Rapp.jpg

yes i b well grounded ~ RHF
-ps- my ground wire is connected to the top
section of the water well casing pipe ~34 feet