-Bob ah7i<< In examples and comparisons we would feed the same power, at the base of the quarter wave antenna, loaded or otherwise we will get the same current. What happens to it along its "travels"
to be BETTER (less ohmic loss) than a loading coil at the base...? 73 Con DF4SA<< I wonder if it is more due to the difference in size of wire used in them (ohmic loses), or sort of linear loading th
pattern. An idealized dipole (or a monopole over ideal ground) with the classical cosine current distribution has 2.15 dBi of gain, presumably squirted in a desirable direction. Make the current unif
in a coil. Quite simply, unless there is a significant loss - either I^2R or radiation - the current into and out of a coil must be the same. After all, a coil is a passive device and can neither cre
to have lightning have a solid path to ground, around my house. << Better idea might be to build the house around the tower, that's what Arnold, W2HCW had to do due to zoning regulations "If the towe
the tower in a "diamond" configuration (points up, down, L & R) bottom about 10' off the ground, feeding the DE at a corner for vertical polarization. 1. How much might the vertical tower in the midd
him as crank ups are dangerous and not climbable. << Crank up towers can be climbable with "climbing tools." The problem is, you don't want to insert anything (feet, fingers) inside the tower, in cas
it should NOT be brought to resonance on and around the desired operating freq. So, where do I tune the trap? I could place it at 14.2 but 14.2 would be my desired operating freq!<< I would not rely
As usual, Yuri, presents a one-sided look at a two-sided debate. He seems to think that science is done like politics - smear your opponent and only tell one-side of the story. Pathetic! 73 de Mike,
ANY measured difference in I(in) vs. I(out) is either due to one of those three effects and to argue otherwise is to argue for perpetual motion. Yep, and the Earth is flat! __________________________
We are not dealing with closed circuit, but distributed and an antenna with standing waves. Here are some explanations for the phenomena: W5DXP: The key to understanding is to realize that the net cu
morning. Your turn. 73 de Mike, W4EF........................................................<< I will only refer to the pile of arguments on eHam.net articles about loading coils, rec.radio.amateur.a
Loading coils are not isolated lumped elements and cannot be modeled as such. A lumped model serves as a decent design tool to determine a starting point, which will have to be further iterated empir
The losening of hose clamps can be caused by the clamps and their design. If you use larger clamp than is appropriate (not always ideal size fits the diameters of tubing) then what we have is larger
Note on Vertical vs. Horizontal polarization. It is not just a question of polarization of the signals, but the difference in the radiation pattern. Similar antennas, similar heights but different po
dipole type design<< Quarter wave vertical will take the best advantage of the meral roof, no need for radials. If you can mount two or three of them, you would get nice array with gain. radials abov
from the article the guy wires prevent them from toppling outward, Ozley said. Because this tower fell away from Interstate 295, the guy wire closest to the highway likely gave way, although whether
the coax around a 3.5" dia 12" former at the point the feeder enters the shack - Viola......it cured all my RFI problems.<< I hated baluns after I fried Hi-Q balun, which stunk for years (fried ferri
but even with a concerted effort I have too much solder a lot of the times... << Let it cool off. Then heat just the tip with soldering iron and while it gets soft, just wipe it with rag or paper tow
array was a little bit bigger. I set up 3 verticals in a isosceles << Not sure how the phasing harness or switching system is connected, by I had some experience and frustration with trying to run th