[time-nuts] GPS Antenna Grounding/Lightning protection. [Cone of protection and other opinion]

The "Cone of Protection" is a thumbrule.  It's not a myth, but it's also not an absolute law of nature. It's a self-fulfilling prophecy to some degree because it drives component design guidelines.  Bunker spacing is also a thumbrule, based on a lot of horrible experience. It's also a function of

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

Seems to me that lightning protection for timenuts who put things on masts keeps this from being completely off topic. People who store explosives in earthen bunkers have learned from many years of experience how far away bunkers have to be spaced so than an explosion in one bunker won't affect

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

If you see St Elmos fire ‘corona discharge bleed process is working as expected Content by Scott Typos by Siri On Jun 19, 2018, at 3:55 PM, Bob kb8tq wrote: Hi If indeed a proper ground system *could* be depended on to “bleed off” and prevent discharge things would be *much* simpler. Indeed

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

First, I recommend the following: http://www.arrl.org/shop/Grounding-and-Bonding-for-the-Radio-Amateur/ well worth the price. second, bleeding off does not prevent discharge. Many such systems are garbage or worse. "bleeding off" is corona discharge from sharp points submitted to a large

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

Hi If indeed a proper ground system *could* be depended on to “bleed off” and prevent discharge things would be *much* simpler. Indeed I’ve been on towers and decided to exit that location as the bleed process became audible. It very much does happen. It simply is not a 100% sort of thing.

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

I put my GPS antenna only as high as it needed to be to clear any accumulation of snow in the winter, so it is about 3 feet above the peak of the roof of the house and about 19 feet above ground level. The 8-inch ground-plane under the puck antenna is grounded to my radio ground. No other

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

Probably the easiest and most economical grounding system is the halo ground with antenna grounds bonded to the halo and the house ground bonded to the halo as well. The halo conductor sizing is governed by local codes, But really what you are doing ensuring that the entire structure and

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

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 wrote: On 6/18/18 6:39 PM, Glenn Little WB4UIV wrote: > To do the grounding correctly, all

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

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

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

Also see this https://www.bicsi.org/uploadedfiles/bicsi_conferences/fall/2012/presentations/CONCSES_4C.pdf Content by Scott Typos by Siri On Jun 18, 2018, at 5:51 PM, Charles Steinmetz wrote: Graham wrote: > If you want to protect your installation from lightening, then there is a > body of

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

Unless all of your ground rods are bonded together, you are inviting disaster. If you have two ground systems, one at the tower and the other at the house, you have a very dangerous situation. If you have a unified (bonded) ground system and take a lightning strike every thing elevates to

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

Graham wrote: If you want to protect your installation from lightening, then there is a body of information that has been developed within the cellular industry that allows a properly installed cellular base site to take a direct hit and continue operating. An example of what they do is

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

Not sure I have much to specific offer, other than some observations. 1. A path to ground is only a small part of the story.  What's really important is the ground reference of all equipment to all other equipment. The huge currents and substantial risetimes can cause large voltage

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

If you want to protect your installation from lightening, then there is a body of information that has been developed within the cellular industry that allows a properly installed cellular base site to take a direct hit and continue operating. An example of what they do is documented in "Motorola

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

I have purchased and deployed Huber+Suhner lightning protectors in the past but have thankfully never suffered an actual strike, so I can't say how well they work under duress.

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

Hi, I have (or had, I guess) a GPS antenna on a tower that took a lightning hit yesterday. You can tell it's going to be a bad day when you walk into your shop, and smell burnt electronics. Still have to troubleshoot exactly what got hit, but the GPSDO was flashing no GPS signal, the 5V