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7 votes
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Lightning protection by disconnect

what would be the theoretical disadvantages of such a disconnect system? Firstly, keep in mind that antennas don't cause lightning damage: grounds do. It's not clear from your description if your ...
Phil Frost - W8II's user avatar
7 votes
Accepted

What's the proper way to mount antenna mast to the side of a house?

I know that the gap between the wall and the antenna mast that would be created using the wall mounts you mention is not for lightning damage prevention purposes. If a bolt of lightning can travel ...
rclocher3's user avatar
  • 9,242
7 votes
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Route cables on the inside of the tower?

Without exceptional grounding of each leg of the tower with heavy straps and grounding rods and an unshielded 4ga ground wire from the antennas the Electromagnetically induced surges are severe on any ...
KD9UQE CRAIG's user avatar
6 votes

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

That statement is wrong on several levels. The antenna is DC grounded so no lighting arrestor is needed. A lightning arrester is needed, even if the antenna is DC ground. The arrester's job is to ...
Phil Frost - W8II's user avatar
6 votes
Accepted

How do Field Day participants protect from lightning?

They are not intending to keep operating in spite of a thunderstorm in the vicinity, are they? That would be very dangerous and foolish. Well in advance of the storm, the group must unplug the ...
Mike Waters's user avatar
  • 8,071
6 votes

How far from a cable entry point can the lighting suppressor be installed

The picture you have drawn suggests a lightning suppressor installed in this way will do little to nothing to protect your station. The suppressor does only one thing: it limits the maximum voltage ...
Phil Frost - W8II's user avatar
6 votes
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Electromagnetic signal from spark gap

Don't worry, there have been many researchers before you, and you can borrow some of their work. Your English is fine. If you do a web search for "lightning spectrum", you will find a ...
rclocher3's user avatar
  • 9,242
6 votes
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Where can one get a "listed" SO-239 lightning arrester?

The NEC defines "listed" as: Listed. Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned ...
Phil Frost - W8II's user avatar
6 votes
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Bonding ground rods for lighting protection

Consequence 1: it's not up to code. A contractor shouldn't do it that way, and if you do it yourself, it might make it difficult for you to sell your house (if you don't take everything down ...
hobbs - KC2G's user avatar
  • 12.5k
4 votes
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Grounding a dipole

The typical amateur radio / SWL budget will rarely allow for sufficient protection from a direct lightning strike. More often than not, the measures taken help minimize damage from a direct strike but ...
Glenn W9IQ's user avatar
  • 18.6k
4 votes
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Are used PolyPhaser IS-50 RF surge protectors likely to work?

The Polyphaser consists of a DC blocking capacitor in series with the radio and a gas discharge element in parallel with the antenna. The Polyphaser can normally withstand multiple <20 kA strikes ...
Glenn W9IQ's user avatar
  • 18.6k
4 votes

Do I have to disconnect antennas during thunderstorms?

As far as I know the probability of direct strike to the antenna is considered relatively small. And if it will happen it is unlikely that your antenna will survive anyway (or the protection will cost ...
Aleksander Alekseev - R2AUK's user avatar
4 votes
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Does the E-field propagate faster that the H-field?

The E and H fields of all RF signals travel at exactly the same speed - the speed of light. The phase relationship between the two fields remains constant as they travel through various mediums. ...
Glenn W9IQ's user avatar
  • 18.6k
4 votes
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Grounding a chimney mounted antenna

You should definitely ground the antenna to your earth system with a heavy conductor. The coax alone will not cope well with the lightning current. By carrying a share of the current, the earth wire ...
tomnexus's user avatar
  • 11.4k
4 votes

Do lightning rods attract or do they help prevent lightning?

These ideas have been around for centuries as lightning dissipation theory and lightning diversion theory. Notably, Benjamin Franklin was an early proponent of lightning dissipation theory. He noticed ...
Phil Frost - W8II's user avatar
4 votes
Accepted

Grounding for lightning safety - upper floor (UHF/microwave antennas)

Your two ground conductors must be connected at both ends. They must be connected at the bottom because that's where the ground is and they aren't ground conductors if they aren't connected there. ...
Phil Frost - W8II's user avatar
4 votes

Electromagnetic signal from spark gap

A bolt of lightning has an average center frequency of about 16 kHz, which varies with the height of the bolt. This is a distant stroke that I captured on one of my SDR lightning receivers, using ...
Mike Waters's user avatar
  • 8,071
4 votes

Where can one get a "listed" SO-239 lightning arrester?

If the problem is only that “SO-239 connectors” and “listed” can't be found together but can be found separately, then you should consider using a different connector — SO-239/PL-259/“UHF” is an old ...
Kevin Reid AG6YO's user avatar
  • 24.7k
4 votes
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Can I connect my station ground to my house's ground rod?

There are lots of existing questions here about grounding, with answers containing lots of good information. Grounding can be a confusing topic, partly because there are different types of grounds. ...
rclocher3's user avatar
  • 9,242
3 votes
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Do I have to disconnect antennas during thunderstorms?

What is "proper" grounding and protection? In my experience, most amateur stations that have installed grounding and surge protection devices have not installed them properly. Surge protection ...
Phil Frost - W8II's user avatar
3 votes

How can I protect equipment against a lightning strike?

What you need to do is follow the requirements of the National Electrical Code (assuming USA). This article covers it well. (ps. Failure to comply with NEC 810 is the #1 reason ham radio operators in ...
user2104506's user avatar
3 votes

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

The W8JI information is pretty good, there are a few points he doesn't touch on though. "EARTHING" or Grounding is a hot subject in many areas and there are many theories related to it. The ...
W9WLS's user avatar
  • 222
3 votes

Diamond X200A Lightning Protection

You question seems to boil down to this: "Do I need to be concerned about lightning protection, even though my antenna isn't very high relative to its surroundings?" The answer is yes. In fact you ...
Phil Frost - W8II's user avatar
3 votes
Accepted

Why have knife switch storm grounds for antennas vanished?

The dimensions of a typical "knife switch" make it well suited to the high impedance of the open-wire or "ladder" transmission lines which were ubiquitous "Long ago." While the wide spacing between ...
Brian K1LI's user avatar
  • 7,878
3 votes
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Lightning protection for a vent stack antenna

Protecting equipment and property with an antenna such as this is no different than with any other antenna. See How can I protect equipment against a lightning strike?
Phil Frost - W8II's user avatar
3 votes

Can I use electrical ground / earth as my RF ground?

"RF ground" usually means "something that is at the same potential as the soil". This is important because if you have a wire (such as your feedline, for example) which is not at ...
Phil Frost - W8II's user avatar
3 votes

Antenna grounding / bonding in relation to my AC service (with pictures)

Grounding is not something where there is a single answer. First, you should read up on the topic. I found a book entitled "Grounding and Bonding for the Radio Amateur" by ...
Hogstrom's user avatar
  • 187
3 votes

Can I connect my station ground to my house's ground rod?

Before connecting anything directly to earth ("ground" in the US), you need to be aware how your home is wired. There are several ways a house can be connected to the power network, as ...
Scott Earle's user avatar
  • 4,619
3 votes

Can I run my antenna coax near a gas line?

The common sense way, followed by most radio hams, is not always strictly according to the rules. In my town for example, permits and inspections are required for any wiring beyond changing a ...
tomnexus's user avatar
  • 11.4k

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