[1000mp] which grounding is better?

Wed, 5 Mar 2003 18:47:09 -0800

Forget all this non-sense about RF "grounds". If you have RF on the
outside of your coax shield braid, use a choke balun. That will kill the
RF in the shack and unwanted radiation. A choke balun can be as simple
as a few coils of coax or several split bead magnets.

RF "grounding" does not affect sensitivity! There is no science that I
know of to support that position. 

Follow good electrical grounding practice (primarily for lightning
protection) and all will be well.

If someone can provide any solid science to prove otherwise, I am all
ears.

73,

Steve
W1SRD

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of [email protected]
Sent: Wednesday, March 05, 2003 6:18 PM
To: [email protected]
Subject: Re: [1000mp] which grounding is better?

In a message dated 3/5/2003 8:04:33 PM Central Standard Time, 
[email protected] writes:

> 
> I presently have a heavy braid that connects the MP, the amp, and an
outside
> groundrod which is very close, right through the wall
> It's maybe a total of 5 feet of 1" wide braid. The other end of the
braid
> goes to my cold water pipe.
> Now I know that solid copper strap is better.
> 

Daisy Chaining the equipment does not work, remove what you have and
start 
over.

I use a 3 foot piece of copper pipe attached to the bottom of the radio 
bench.  Each piece of gear is tied to the copper pipe with welding cable
1/0, 
I made up special connectors and soldered them on to the wire and
connected 
to the wing nuts on the back of the equipment. The Wire is connected to
the 
copper pipe with stainless steal hose clamps with Penetrox (electrical 
compound) in between.  I then have two welding cables (side by side)
tied to 
an 8 foot ground rod that was driven into the concrete floor (drilled
hole 
with concrete bit first).  I have about 2 1/2 feet from the ground rod
to the 
copper pipe.  I also tied a ground to the tower and to the cold water
pipe to 
keep earth ground exactly the same everywhere, this allows  the receiver
to 
hear better.

I operate full legal limit and I have inspected the neighbors next door
while 
I was at full legal limit into the log periodic with only slight
interference 
into the phone that was cleared up with plug in phone filters from Radio

Shack.

Spend a lot of time on your RF grounds and do them right, it pays off
with 
better sensitivity and better neighbor relations.

73
Douglas

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