We have lost a standard. From the email today... -- Folks: This is the saddest announcement we have had to make: It was discovered this morning that LB Cebik, W4RNL had passed away. He was a friend t
You are talking about substituting discrete wires to create the effect of a loop made of 10 or 100 mm pipe. Just do that in the model and see what happens. 73, Guy. Hello Guys, I have a model for loo
A Force12 C3SS would outperform the G5RV without the loss of traps. Since 25' is nearly a half-wave on 20m you will be surprised how well a good tribander will do at that height. 73, Guy. I am curren
In order for me to see what is going on, I need to run the director configuration with AO Pro, which is the only tool that will allow me to watch what is changing according to a formulaic progression
If I am understanding the 259B manual correctly the "loss" is actually "return loss" and measures the ratio of energy sent to reflected energy received in dB. This means different things is different
At 160 meters the antenna is an 1/8 wave and need base inductive loading. On 80 meters it's at or near 1/4 wave resonance. On 40 meters it's an end-fed half wave, with a *very* high Z feed. It is lik
Second what Gary said. Further, from my experience in model vs. actual, the one thing I *don't* worry about is the exact presented impedance. The model will tell you things to try, things to avoid, b
I'll have to second that. It only takes a little accidental nick to give a breakdown a place to start. I've wound transformers with *double* thermaleze and had them arc at QRO levels. Thermaleze insi
The often quoted rule: Movement of charge creates electromagnetic radiation. If you move an electron from here to there it leaves three dimensional "ripples", not entirely unlike the two dimensional
Getting into the calculus level of explaining radiation at this point. Also at the point where ordinary conversational meanings of words diverge from "specialty" meanings, and technical conversations
One at a time... It is abstract. It is a mathematical concept which appears to map to observations. The point at which you object is the base layer of the concept. What lies beyond is theory and usua
Easy now. I haven't commented on your English. And I won't, since I don't really have a second language. You are ahead of me there. People create models of things they don't understand all the time.
For what it's worth, I'm the moderator. I think the "expansion" scope that Gary refers to has been here all along. The banner on the subscription page reads "Antennaware -- Antenna Modeling, Programs
Using the tin roof itself for the ground plane is rife with potential connectivity problems. Back in my Washington DC just out of college days I lived in a row house block with parallel copper roofs
Hi again, George. With respect to the theory part...to finish up on my earlier post. The battle with making a vertical work well is fighting off loss. The classic multi-band maxi-loss vertical consis
The task of the radials in your design is to behave as a non-radiating non-lossy current sink, a place to store the opposite charge carried on the feedline shield. The radials are opposing in order t
Speaking to a practical detail, arcing to what? 25' from the insulated end is a relatively low current/high voltage spot on a 160m L in the clear. If it is touching a tree, metal, etc, the apparent e
The first thought given to that kind of change in gain is that one of the gotcha's has been violated somewhere in the model. But the only way to judge that would be to see the model itself, if you ca
Andy, I'm working on a detailed reply, but not yet done. The main practical problem with the model will be in actually attaining the phase/current/voltage relationships which are set "by magic" in th
Since noone has replied... Short of putting up and running such a model, it's hard to conceive that two antennas that close would not affect one another, absent some careful invention and modeling to