[time-nuts] GPS Antenna Grounding/Lightning protection.

Scott McGrath scmcgrath at gmail.com
Tue Jun 19 10:56:03 EDT 2018

The 18” inch requirement is partially for damage resistance and partially to ensure adequate soil moisture for conductivity.   

Content by Scott
Typos by Siri

On Jun 19, 2018, at 10:50 AM, jimlux <jimlux at earthlink.net> wrote:

On 6/18/18 6:39 PM, Glenn Little WB4UIV wrote:

> To do the grounding correctly, all connections exterior to the building are to be welded.
> The cable to ground rod welds are to be 18 inches below grade.
> The exterior cable is to be number 2 copper or larger.
> To bond numerous ground systems together, a number 2 copper cable is to be buried at 18 inches and welded to each ground system.
> If using eight foot ground rods, a ground rod is to be driven every 16 feet along the connecting cable and the cable welded to the rod.

It helps to know *why* some requirements exist - I suspect the 18" burial requirement is to avoid accidentally digging it up or damaging it. I can't think of an electrical reason for it.

> A lot of work, but, cheaper, in the long run, than continuing to repair/replace equipment.

It depends

Unless you're doing geodetic or precision timing work with a 2 or 3 band GPS, replacement GPS antennas are cheap.
I'd worry about the receiver and related equipment, but the antenna itself might be sacrificial.

As always, there's a risk/budget tradeoff

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