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Questions tagged [lightning]

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4
votes
1answer
60 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) ...
0
votes
1answer
81 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. ...
6
votes
3answers
161 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 ...
2
votes
3answers
317 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
2answers
178 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 ...
4
votes
4answers
820 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
152 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 ...
2
votes
2answers
213 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 ...
4
votes
3answers
463 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. ...
5
votes
4answers
1k 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 ...
1
vote
3answers
398 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 ...
2
votes
5answers
400 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 ...
5
votes
3answers
343 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 ...
3
votes
2answers
1k 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 ...
6
votes
2answers
713 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 ...
4
votes
1answer
1k views

DIY lightning arrester - 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 ...
14
votes
5answers
5k 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 ...