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Proper grounding for Omni antenna?

 
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jtotheas
EVDO Newbie


Joined: 08 Feb 2009
Posts: 5

PostPosted: Mon Feb 09, 2009 5:16 am    Post subject: Proper grounding for Omni antenna? Reply with quote

I purchased the Omni antenna and mounted it on my house. It works great but I am wondering what is the proper way to ground the antenna?
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3Gstore
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Joined: 19 Sep 2006
Posts: 3158

PostPosted: Mon Feb 09, 2009 8:18 am    Post subject: Reply with quote

for proper signal operation, the omni does not need "grounding", it just needs its six "ground plane" radials installed.

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JoeCHecht
EVDO Junkie


Joined: 05 Jan 2008
Posts: 428

PostPosted: Mon Feb 09, 2009 2:19 pm    Post subject: Re: Proper grounding for Omni antenna? Reply with quote

jtotheas wrote:
I purchased the Omni antenna and mounted it on my house. It works great but I am wondering what is the proper way to ground the antenna?


If attached to your house, you would be very wise to ground the unit.

U.S. Electrical codes require you to ground the unit.

If you get struck by lightning, and your house burns down, your insurance company will not pay the claim (seen this several times in the past couple of years).

Also, I had one neighbor killed by this exact issue, so, for your safety, I would disregard all advice by any "expert" here who does not straight out tell you you need to ground this installation in no uncertain terms.

The forum admins, as well as the 3G store are very well aware of this (even though they often disregard informing people about the issue).

After much prodding in these forums, and making them aware of their liability, they 3-G store finally added a lightning arrestor to the store's inventory. I am unsure if they still sell it, or if they sell the additional hardware needed.

I am unsure if they produce a technical guide to help you with a proper and legal antenna installation, however, if they do, I might expect it would come with a "only if you purchased from the 3G store..." (as opposed to a generally available article as a public service).

You do need to run the properly sized solid copper grounding wire from the base of the omni, as straight as possible to a copper grounding spike (about 8 feet long) hammered into the earth. This is available at your local home hardware store. You should also install the lightning arrestor inline with the coax leading to your equipment.


Joe
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3Gstore
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Joined: 19 Sep 2006
Posts: 3158

PostPosted: Mon Feb 09, 2009 3:02 pm    Post subject: Reply with quote

i'll repeat the first part of my post:

"for proper signal operation"

can you dispute the accuracy of my post?

FYI, each product description of each omni lists the lightning suppressor as an option, and points to:

http://3gstore.com/index.php?main_page=product_info&products_id=596

when we are asked, we will point people to your prior forum post on this subject by giving them this URL:

http://3gstore.com/lightning

and we've done that ever since that post
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3Gstore
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Joined: 19 Sep 2006
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PostPosted: Mon Feb 09, 2009 3:06 pm    Post subject: Reply with quote

hey jtotheas, was your question related to signal reception or lightning protection?
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jtotheas
EVDO Newbie


Joined: 08 Feb 2009
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PostPosted: Mon Feb 09, 2009 4:49 pm    Post subject: Reply with quote

It was related to lightning protection. The signal is great already.

I installed WildBlue for a while and it was required to ground from the Dish to the house ground with a grounding block for the RG6 in the middle. I was wondering the best (to code) solution for the Omni would be.

Thanks for your help, regardless.
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3Gstore
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Joined: 19 Sep 2006
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PostPosted: Mon Feb 09, 2009 4:57 pm    Post subject: Reply with quote

score (another) one for joe. i'll go sit in the corner.
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chassit
EVDO User


Joined: 12 Nov 2008
Posts: 62

PostPosted: Mon Feb 09, 2009 5:21 pm    Post subject: Reply with quote

Alex, no need to sit in the corner. This thread is an *excellent* example of what makes these forums so valuable. Your initial response assumed he was talking about signal ground planes -- an understandable error since he didn't mention lightning at all. Bottom line, he quickly got the right answer with confirmation from multiple knowledgeable people.
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JoeCHecht
EVDO Junkie


Joined: 05 Jan 2008
Posts: 428

PostPosted: Mon Feb 09, 2009 5:34 pm    Post subject: Reply with quote

Alex wrote:
i'll go sit in the corner.


Hey! Get out of that corner and get back to work Smile

J
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reggie14
EVDO User


Joined: 09 Aug 2008
Posts: 29

PostPosted: Fri Feb 13, 2009 2:31 pm    Post subject: Reply with quote

I have the Wilson antenna and I want to mount it on my roof. But, I know I better get some lightning protection first. I'd like some advice on the placement of the lightning protector, and go to ground it. My plan has been to put the lightning protector in-between the ~10 ft cable that's attached to the antenna, and a ~10 ft extension cable that leads into the house and to the modem. This would put the lightening protector outside, which to me seems like the natural place for it.

The product page here seems to suggest using a short 2 foot cable off the protector, which sort of suggests that the protector would be inside the house. I'm not sure where I would ground it inside. I don't have cold water pipes where I want to set things up, and I'm guessing I can't use hot water pipes or the ground on electrical outlets (you can probably tell I'm no electrician for even considering those things). If it's really that much better to have it inside I could probably find a way to arrange it that way though.

Even if I put it outside, I'm not sure how I'd ground it. We had a satellite dish professionally installed on the roof, and I assume they grounded it. But, i highly doubt they pounded an 8 foot rod into the ground. I've tried going similar things before with very little luck. I can get several feet into the ground, but not 8. There used to be lightning rods on the roof of the house, but they're not longer there. My plan is to try to find where they were grounded, but I'm not sure if that's going to work out.

Worst case scenario: how bad is it if I take a copper pipe and pound it ~4 feet into the ground?
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