Search results

This antenna has been modeled, although it has been a while for me. The radials don't really affect performance (gain) or the radiation angle of the antenna, and that holds for weather you have none, or 4 1/4 wavelength, or a bunch of shorter ones like this antenna, so as far as that is...

Its an acronym for "terminated end fed inverted vee antenna". The DB

Citation Needed, and with all due respect, its going to have to be one hell of a citation. I have run multiple tests with both types of coax and many others. LMR-400 works fine for radio. There is a very good reason that many think it is the best coax out there. Actually, if you bother to...

The models I made, and I think Marconi made as well we based on the exact dimensions of the antenna. You shouldn't have to do much of anything unless you have a problem. The DB

The angle of radiation for the 10 foot high antenna is 45 degrees, the 20 foot high antenna is about 25 degrees, and the 30 foot high antenna is 17 degrees. All this being said, I think to many people focus to much on this stat. There are far better things to focus on. This angle, in and of...

I have some models. Before I get into them, you should read the full post before just taking them for what you see. They are far enough outside of my expectations that I am questioning the results myself... The first of each pair of models is from the point of view of the side, and the second...

Actually, I do have another queation, what is this antenna made out of? Copper? Aluminum? Something else? The DB

Some people round the half wavelength length to 18 feet because it is easier, others use that length because they don't know any better. Also, to expand on what you noticed, if you take an antenna and move it around the chassis of a vehicle and measure it, you will notice that the tuned length...

No further questions, and sorry for the delay, life happens and as such I haven't had the time to sit down and make a model. I will make this model for you when I get a chance. The DB

I don't think the time domain is the cause. If it were, it doesn't explain why the X and Y axis does this, while the Z axis, alone, does not. I would still expect a dipole on any of the axis in free space to create the same pattern in relation to the dipole, and expect that pattern to have the...

The shield is attached to something that appears to be a boom, is that boom directly attached to the antenna's elements? Also, I can't read the writing on it, so how far past the front element does that boom go? The DB

Here is an attempt to show what I am seeing. I had to get out an older windows based laptop to use this tool as it doesn't work through wine on my current linux machine... Anyway, here is total gain, we are looking down the Z axis, the dipole antenna is on the X axis, which goes from left to...

I'm not so sure this antenna is radiating vertically polarized radiation anymore. In both nec2 and mininec, if I have a straight vertical center fed dipole (or in this case a straight wire on the Z or vertical axis), in free-space, all of its radiation is showing up as vertically polarized, as...

What do you want modeled? The DB

So you quote a question, and then don't bother to actually try and answer the question. Instead, you use distractions that have nothing to do with what was being asked or discussed... I get it, you are a true believer, and that belief must not be questioned. Ever. Period. End of Story. Now...

So, as no one else had anything to add, I will show some of my initial results here. The first image is created with 4nec2. It is looking at the radiation pattern on the horizontal plane, or like you are looking down on it from above. The antenna was mounted 10 feet above the earth, and this...

Now that you put this thread back in front of me, I started wondering why we are getting a vertical component from the super sinner antenna models. Even the test model I made early on, which was made up of 100% horizontal wires, shows a definite vertical component. As of yet, no one has posted...

The last few editions of the ARRL antenna book give directions and formulas on finding the size of a T type capacity hat. If you have any it might be a good place to start. The DB

Good answer, its actually close to what I was looking for. I might have actually said this above, but an antenna model in freespace shows where an antenna is directly putting its signal, while an antenna modeled over an earth shows where the signal goes after the earth has played its part...

So you didn't bother to answer my question, yet expect me to answer yours? Its just like you to try and latch onto something that you think you can "win" on while ignoring all the evidence that is mounting against you... Next, your going to declare victory, but as usual that victory will exist...