Hi it was recently stated that the antenna and ground return current at the feed point terminals (where let's assume the TX is located) must always be equal. And this certainly makes sense to me if w
You are misinterpreting what you are seeing. When you put a resistor in one side of a dipole you modify the current distribution in both sides of the dipole and the side with the resistor has a large
DOES ANYONE REMEMBER Gustav Kirchhoff You are misinterpreting what you are seeing. When you put a resistor in ne side of a dipole you modify the current distribution in both sides f the dipole and th
Price W0RI You are misinterpreting what you are seeing. When you put a resistor in one side of a dipole you modify the current distribution in both sides of the dipole and the side with the resistor
So I modeled a half wave dipole in free space and sure enough the wire segments on each side of the feed point carried equal current. I then placed a resistive load at the center of one half-element
Yes current on each side of the feedpoint is always the same but you can't see that with an NEC measurement because you are always measuring one segment away from the feedpoint and when the current d
Tom, it's worth adding to this that trying to make current measurements in the ground using 60hz is pretty useless for another reason: induced currents from the ac power system (especially in north a
I think you may be selecting the wrong type of source, if you are using EZNEC. In the source-type selection, chose "SI", not "I". A split source places the source at a segment junction, so you can s
Hi Bill, That must be a problem, too. The entire concept of using 60 Hz, or any frequency far from the operating frequency, is just bizarre to me. It seems like once someone publishes an article, eve
I forgot about the SI source. That will effectively place the source at a segment junction. Actually it places two sources in the middle of two adjacent segments and that simulates almost the same th
The fact modeling programs allow perfect sources right at the wire also allows building antennas in models that cannot be built in real life. This has happened several times with antennas. One case
Here we go again, speaking of misinformation, peer review, spreading false "guru" stuff. You can not apply Kirchoff law from DC circuits to the current behavior along the STANDING WAVE RF radiator. C
Yes, we can. Kirchhoff's law is Kirchhoff's law, and is not frequency dependent. I can't imagine anyone thinking otherwise. Thinking Kirchhoff's law applied only to dc circuits is like thinking Ohm'
Sooo, there is no current and voltage variation along the standing wave resonant dipole? Soooo, Jasik et al, all those antenna books, modeling programs showing RF CURRENT and/or RF VOLTAGE distributi
Yuri, Kirchhoff's laws apply to ANY system when we include displacement currents. Displacement currents and Kirchhoff's laws have been around since the 1800's. As far as I know, you are the only one
Confirming Tom's test. When I first built my 230 foot diameter ground screen, consisting of #16 wires on a 3x3 foot grid with crossovers soldered, I put up a 40 meter vertical in the center to test t
Knowing both Tom and Yuri to be two of the best and brightest, I am sure this is going to be an interesting discussion, and only the devil is making me stir the pot a little in an impractical way. Ki
With an infinitely long conductor, the answer is displacement currents. There is no reflected wave, and no need for a reflected wave. It's all part of Maxwell's equations. If we look at any conducto