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[IC-7000] Re: Grounding plus newbie questions.


 

Yes. And in the event of a lightening storm and when not in use, disconnect the antenna(s) from the 7000 and place the ends into an individual clean dry glass jar. Don't put your faith into a blitz bug.

Gene
KN3ZIP


Note that diagram omits what many would consider essential items (e.g lightning protection on antenna lines).

Best of luck to you.

73
Scott
W7SLS


 

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Doing what Gene writes below CAN still invite disaster.? NJ1V (now K5XA) did that here in Oklahoma City years ago and the stroke STILL came in on the coax from the tower(s) 150 and 250 feet away and blew right through the jars to the rebar in the house's slab.? LOTS of melted stuff, even to gear that was disconnected from power lines and antennas.
Best to not have any feedlines even coming in the house. I suggest hooking the feedlines to a ground bus outside the house, or at least disconnecting the feedlines and laying them on the ground AWAY from the house.
Telephone lines also seem to be a common entry point to your house for lightning damage. Gets your phones, computers, modems, TVs, satellite receivers, etc.
* * * * * * * * * * *
* 73 - Mac, K2GKK/5 *
* (Since 30 Nov 53) *
* k2gkk hotmail com *
* Oklahoma City, OK *
* USAF & FAA (Ret.) *
* * * * * * * * * * *
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> To: ic7000@...
> From: elcoggins@...
> Date: Sat, 30 Nov 2013 12:42:01 -0500
> Subject: Re: [IC-7000] Re: Grounding plus newbie questions.
>
> Yes. And in the event of a lightening storm and when not in use, disconnect the antenna(s) from the 7000 and place the ends into an individual clean dry glass jar. Don't put your faith into a blitz bug.
>
> Gene
> KN3ZIP
>
> >
> >Note that diagram omits what many would consider essential items (e.g lightning protection on antenna lines).
> >
> >Best of luck to you.
> >
> >73
> >Scott
> >W7SLS


Charles Scott
 

All:

This is, as someone else mentioned, a very bad idea. The ends of unterminated cables are high impedance node, which means high voltage. For a couple of reasons, the voltage at that point can be many times the voltage getting coming into your house from the strike.

The bigger issue here is the state of knowledge in the Ham community about grounding and lightning protection. The comments here reinforce that concern (sorry), and often suggestions passed from Ham to Ham can be down-right dangerous.

Of the practical methodologies for lightning protection for Hams, there's primarily two approaches. One is to disconnect EVERYTHING that comes into your house from your antennas, including any ground conductors, and throw them outside and well away from the house. But of course you need to do this well in advance of any potential lightning event. The second is to learn about and implement a "Single Point Ground" and methods to minimize the energy entering the house on ALL conductors, including any ground conductors. If you're not familiar with Single Point Grounds, don't assume you know what it means, look it up. There are other approaches, but they get progressively more difficult to implement.

Also, the "blitz bug", more commonly called "lightning arresters", in most cases do not protect you or most of your radios and associated equipment, they only protect your radios from lightning and other impulse energy from coming in on the inside of your transmission line.

So-called "RF grounds" are another discussion, but safety first.

Chuck - N8DNX

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"Yes. And in the event of a lightening storm and when not in use, disconnect the antenna(s) from the 7000 and place the ends into an individual clean dry glass jar. Don't put your faith into a blitz bug."