Many folks make the assumption that the station is going to be somewhere
near where the common ground entry point is for the cables, power,
telephone, etc. In my case, the station is, by necessity, 70 cable feet
from that point. The cables run through a crawlspace where they come in
close proximity to metallic ductwork, etc. The Polyphaser people
recommended a second common ground at the equipment site, i.e., bonding the
various pieces together to a common buss. Is it your belief that it's
unnecessary to have that second common ground in that case?
K8AC
----- Original Message -----
From: "Frank Donovan" <donovanf@erols.com>
To: <towertalk@contesting.com>
Sent: Friday, January 14, 2005 8:48 PM
Subject: Re: [TowerTalk] Station Ground
You should focus your efforts on designing and constructing a low
impedance grounding window at the location where your cables
enter your home. All cables entering your home should be bonded
to the grounding window either directly or through suitable lightning
protection devices.
There is no need whatsoever for any further grounding of your station
equipment, other than the green wires from your equipment to your
AC power receptacles.
73!
Frank
W3LPL
donovanf@erols.com
----- Original Message -----
From: N6KJ <n6kj@yahoo.com>
To: <towertalk@contesting.com>
Sent: Friday, January 14, 2005 7:44 PM
Subject: Re: [TowerTalk] Station Ground
At the moment, my rig and amplifier ground lugs
are not connected to anything. I have no stray
RF problems or RFI that I am aware of (except a
little bit of TVI when operating 40/80 which I've
never been able to solve). The manufacturer always
says you should connect up the ground lug. So far, I
have not done that but I WILL do it if-and-only-if
it doesn't make things worse. My assumption is that
the ground lug is there for a reason Maybe this is a
bad assumption, but ....
The primary reason for my questions today is:
I am going to start on a home addition soon. As of
today, my rig is located in the basement next to an
outside wall. I can easily get to a ground rod
that is located only about 5 feet from my
rig. This will no longer be true once the addition
is built. Once the addition is built, my rig
will still be in the basement but the wall will
no longer be an outside wall, SO if I ever want a
good ground system with a short connection to ground
then I need to do it now. I don't have to hook it
up to my rig/amp, but I have to at least drive in
the ground rods and run a wire from the ground rods
into the shack.
I'm not worried about safety ground. I can use the
existing safety ground OR add one later, but a good
RF ground needs short leads to ground and that means
building the grounding network NOW. I think I now
have enough info from everyone to do that. Thanks.
--- Jim Lux <jimlux@earthlink.net> wrote:
> At 01:39 PM 1/14/2005, you wrote:
> >How do people attach their rigs to a bus-bar (or
> >similar)? The bigger the ground wire the better,
>
> WHy would you necessarily want a huge wire? How
> much current do you expect
> to be carrying through that wire? Hopefully not
> much. Sure, bigger is
> (slightly) lower inductance, but presumably, the
> wire is fairly
> short. Also, is the rig chassis ground common with
> the power supply return
> (if 12V powered)? What about the electrical safety
> ground (the greenwire
> ground)?
>
> [ Stuff Deleted ]
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
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any
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
any questions and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
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http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
_______________________________________________
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