Questions tagged [lightning]

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18
votes
5answers
6k views

How can I protect equipment against a lightning strike?

A lot of aerials (almost by design) would be rather good attractors of lightning. What steps do I need to take in the field to keep my gear safe against a lightning strike? I'm presuming the obvious ...
8
votes
2answers
879 views

How to keep a disconnected coaxial connector weatherproof?

The advice I have seen on lightning safety is that if you don't have high-quality lightning protection (and associated grounding) installed on your feed line, it is advisable to, during a storm and ...
7
votes
2answers
148 views

Do lightning rods attract or do they help prevent lightning?

I'd read that the current theory of how lightning rods protect a house, antenna tower, or other structure is by preventing lightning from striking -- that is, the sharply pointed rod lets charge ...
6
votes
1answer
106 views

How do Field Day participants protect from lightning?

I'm planning to attend Field Day this weekend, and the forecast calls for thunderstorms. I can picture a serious issue with a bunch of temporary antennas set up in an open area when a thunderstorm ...
6
votes
3answers
691 views

Lightning Dissipators

I have heard about many lightning protection strategies in the shack, but nobody mentioned the lightning dissipator. The lightning dissipator consists of many small spikes and prevents a strike by ...
6
votes
2answers
2k views

DIY lightning arrestor - gap size?

I have an antenna that's well above the treeline, and I've heard I can add some small amount of protection by placing two bolt heads a short distance from each other, one connected to the antenna, the ...
5
votes
3answers
589 views

Lightning strikes nearby and coaxial cable

A direct hit on my home by lightning is very, very unlikely. However, many lightning strikes that hit Earth nearby are by far the main hazard for ham radio gear (in my opinion, after 60 years in the ...
4
votes
3answers
823 views

Colocated three orthogonal wire loops for lightning detection network

I'm considering building multi-turn wire loop receive antennas for a blitzortung.org lightning detection receiver. It has three separate channels for H-field antennas, operating simultaneously. ...
4
votes
1answer
109 views

Is this transmission line peak voltage formula published in CQ Magazine more accurate?

In his July 2018 article in CQ magazine entitled “Lightning (and EMP) Surge Protection for HF Radios”, Steven Karty, N5SK based much of his analysis for properly specifying a GDT (Gas Discharge Tube) ...
4
votes
4answers
3k views

Grounding a dipole

How do you properly ground a dipole (RX only for VHF scanning) to protect it against ESD/lightning? In my set up i'm putting a dipole on my roof. I've connected the two dipole elements together with ...
4
votes
4answers
2k views

I am installing a ham radio and want to properly ground it

I am installing a ham radio and want to properly ground it. I will be including a lightning arrester that will also go the the ground. I will have a 20' mast with a long wire antenna running 130+ ...
3
votes
2answers
92 views

Grounding a chimney mounted antenna

I'm installing a new antenna mast to hold one or more antennas. The new mast will be strapped on to a chimney near the center of my house. Coax will run down the mast, across the roof, down the side, ...
3
votes
2answers
340 views

Are used PolyPhaser IS-50 RF surge protectors likely to work?

I'm looking at buying a used IS-50NX-C0: The listings usually say something like "Used, pulled from working equipment." While I'd believe they still work as far as normal operation is concerned, I ...
3
votes
3answers
127 views

Why have knife switch storm grounds for antennas vanished?

Long ago, it was fairly standard to provide lightning protection for outdoor radio antennas by installing a large double-throw knife switch -- antenna leads to the center, radio on one side, ground on ...
3
votes
2answers
2k views

Adequate lightning protection for sloped dipole or G5RV?

Has anyone had experience, or knows from first principles, whether installing a G5RV or dipole BELOW a "lightning-rod" in such a manner would serve as a means of discouraging direct lightning strikes ...
2
votes
3answers
1k views

Lightning protection by disconnect

Currently I am evaluating options for my antenna's in regards to lightning protection. My setup is a physical disconnect of all my antennas using an outside "patch panel". So every time I power up ...
2
votes
5answers
577 views

What would be the easiest and most cost effective ground system for a startup UHF/VHF station

I just passed both my Technician and General Class license this past weekend, and am now contemplating my first station. To get my feet wet I'm planning on getting a Yaesu FT-7900R Dual band Radio ...
2
votes
2answers
516 views

Grounding Help - Where To Route My Wires

Here is my situation. My antenna mast is on the opposite side of the house from my ham shack, same with the power service entrance. I have installed ground rods roughly every 16 feet with #6 wire ...
2
votes
2answers
229 views

How to weatherize a Polyphaser surge protector?

Polyphaser sells a WK-1 weatherproofing kit for their devices that are not weatherized such as the IS-50 series. It looks like a plain sheet of weatherproofing tape like any other, such as might be ...
1
vote
3answers
188 views

Do I have to disconnect antennas during thunderstorms?

lightning damage can be extensive and costly, its even life-threatening. If I have properly grounded the equipment and have a Surge protection device, do I have to disconnect the antennas during the ...
1
vote
3answers
613 views

Diamond X200A Lightning Protection

Please forgive the naive question, as I've been away from the hobby for too long, but want to make sure I do this right. We just added an addition to our house, and I lost my usual mounting place for ...
1
vote
1answer
117 views

How large and where should a perimeter ground be installed?

From a comment on How can I protect equipment against a lightning strike? Most of the damage from nearby strikes comes from strong voltage gradients over the ground or between the ground and ...
0
votes
1answer
92 views

Does the E-field propagate faster that the H-field?

I need some proof that the electric (E-field) and the magnetic component (H-field) of a lightning stroke both propagate at the speed of light, and that there is not a significant delay between them. ...