The more familiar way (for me) to say it is that the electric field (volts/meter) produced by a conductor at a certain voltage relative to a distant object depends on the "sharpness" of the conductor
Gene, Here are my 2 cents. A transformer _can_ provide some protection against HF signals & transients that may come in on the line, but most transformers aren't designed for that kind of isolation.
Solar heating of materials is not a "black and white" issue. You have to think about wavelengths. The input from the Sun (after atmospheric effects) is primarily in the visible wavelengths. (That's w
It's a dynamics problem, not only statics. Those birds are conducting flight operations after all. If you shoot at them, they'll all take off at once, and then you'll be sorry. That's if they jump up
Wisdom, please: I want to run 1.5 inch copper strap from my SPG bulkhead to my AC ground point, which is my water service entrance, following the "bond the grounds together" principle. Question is wh
I can add a few details. I am indeed in CT, on a granite ledge about 100 ft from the Long Island Sound. There is a few feet of soil over the ledge. The water entrance is "city water", and it runs met
Several folks have pointed me to the Polyphaser copper strap to galvanized pipe clamps (e.g., model TK-2) using a stainless steel intermediate layer. That's probably what I am looking for, or for mor
Some are saying stainless steel is the right stuff to put between copper and zinc (galvanized). Rob thinks brass is the right material. Zinc to galvanizing (zinc dip) is obviously harmless (no electr
I'd rather say that "impedance at the transmission line" and "forward / reverse / circulating power" are just different ways of analyzing the same physical system. Sometimes one is more useful that t
I hope there's more light than heat (forward or backward) in this discussion. Anyway, the common SWR meter samples forward and reverse power by adding a current sample and a voltage sample. This make
Gary, An impedance mismatch is the same thing as a reflector. How do you think mirrors work? It's a matter of perspective. "Reality" of power flow is debatable. Let me describe it from my viewpoint a
Well I think my cell phone beats CW when it comes to sending pictures and mp3s, not to mention plain old voice! Theoretically, you could uuencode a voice file or photo and send by CW, but it wouldn't
People should be aware that there is such a thing as libel, which is defamatory written speech. From freeadvice.com: "Defamation, sometimes called "defamation of character", is spoken or written word
I use 1" braid for this kind of thing, along with a 100 W soldering iron. Everyone needs a big iron once in a while... Washers (unsoldered) and wingnuts complete the job. 73 Martin AA6E martin.ewing@
Good physics lesson, Jim. I'd add that truly isotropic antennas are physically impossible -- or at least unrealizable. Not that it matters much for practical purposes. 73 Martin AA6E - Hide quoted te
I ran across an iFilm video at http://www.ifilm.com/ifilmdetail/2676026 that shows a 1998 Omega tower demolition. Awesome. 73 Martin AA6E -- martin.ewing@gmail.com http://blog.aa6e.net ______________
Makes a difference if a Cat 4 hurricane is blowing! The demolition (in still air) seemed to blow the guy wires and possibly the base. I didn't see any explosions up the tower, though there may have b
Mike, People all have their favorites, but I would generally choose PP, which are widely used in the communications industry. You can have safety or you can have low cost. I'm not sure about both. Un
Jim, I agree with Gary. One way to look at this is to imagine that your shack is enclosed by solid metal ground walls. All your cables, including power, telephone, coaxes, etc., are surge protected a
Unfortunately (?) we don't all live in FL, and we don't get to test our ground systems on a regular basis. You can't really trust your ground system unless you can test it under realistic conditions.