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
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
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
Quite possibly you are experiencing dielectric heating of some component of the antenna itself, and are losing connection when some part gets hot enough. Most of those kinds of antennas do not really
Posted an earlier version on topband (I think, still getting used to Gmail interface) Part of the problem is trying to get an absolute value to mean something when the local variations in ground defe
The length on 40 makes it excitable on 20 meters, simply due to the proximity, with or without the feedline attached. Putting EDZ's for 20 and 40 in proximity probably won't work in the ordinary sens
Admittedly from a bit of a pessimist about manufacturers using the least in products they could get away with instead of the best... Any one of the components you mentioned could give the behavior yo
Water wicked into the shield weave present in coax by being broadly lossy, which LOWERS swr rather than elevating it. It's a fairly weird problem if it only shows on one band. Water logged coax CAN c
The C3 series from Force 12 can be tuned on 17 and 12 with patterns. One of them is reversed if I recall correctly, but useable. But those antennas don't use traps. I would be wary of tuning trap tri
Perhaps one of the reasons is that the best gain and pattern is not necessarily at a 50 ohm zero reactance point on the DE, in some cases "miles" away from 50 J0. I found this consistently with a lot
Know several free programs, but not the source code. Anyone else? The NEC4 professional license comes with Unix-based source code, but that's confined to the community of user's and changes must be s
Unfortunately you describe a file which is five years old. The method and combination files may likewise be as old. If you cannot get in touch with authors and/or a user's group for the software, thi