[TenTec] RFI Issues

[Carl Moreschi]

The most important thing to disconnect when a lightning storm is coming 
is all power from all equipment.  I have all my power connections going 
to a common plug.  I pull this one plug and 100% of all my computer and 
radio equipment is now isolated from main power.

The second most important thing to disconnect is the phone and data 
connections coming from outside the house to the computer equipment.

The third most important is to disconnect the antennas from the radios.

Carl Moreschi N4PY
121 Little Bell Dr.
Hays, NC 28635
www.n4py.com

On 5/22/2012 8:30 AM, Bob McGraw - K4TAX wrote:
>
>
> 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 at yahoo.com>
> To: "TenTec .com"<tentec at 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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