Here's where I view that people get in trouble. They drive a ground or two
and connect it to their radio or station equipment. They plug the radio in
the wall plug which has neutral and ground. Neutral and ground are
connected at the breaker panel for the house per NEC. The ground at the
breaker panel is attached to a driven ground outside, again per NEC. A
lightning storm approaches and they disconnect their antennas. A nearby
strike, meaning up to 5 miles away, causes the two or more ground points to
have different voltage potentials as they are separated by some distance of
a few feet to several hundred feet. There is resistance in the earth
between the ground points thus with current flowing through the earth there
is a difference in voltage between the two or more grounds. Now, what's
connected between the two ground points? The radio and station equipment.
Therefore, even when antennas are disconnected and the radio is turned off
there is a path through the ground and neutral back through the radio or
station equipment. It spells failure and we often hear........"but my radio
was grounded, my antennas were disconnected and the radio was turned off".
The point is the fact that ALL grounds must be bonded together and
preferably outside of the structure. This includes a hard electrical
connection back to the AC mains ground point.
73
Bob, K4TAX
----- Original Message -----
From: "Jim WA9YSD" <wa9ysd@yahoo.com>
To: "TenTec .com" <tentec@contesting.com>
Sent: Tuesday, May 22, 2012 12:52 AM
Subject: Re: [TenTec] RFI Issues
Sorry Jim
When the FCC had checked out my installation cause of an RFI issue, they
found that I had a bad solder joint on my shielded ground and fixed it for
me. All was well. If the the shielded ground was BS they would have told me
and not fix it?
Tying station ground to electrical ground low impedance please describe.
Existing wiring. The 2 grounds were separated at time of inspection was in
code then but is not in code now, residential wiring does not have to be
upgraded unless there was remodeling, house was sold, and the sort, so then
it needs to be brought up to code at that time.
Stay on course, fight a good fight, and keep the faith. Jim K9TF/WA9YSD
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