Toby, with small antenna spacings, expecially below .25 WL, real pattern is a combination between directly excited elements and parasitic excited elements. In real world, antennas will not behave as
Such an antenna is not practical because of its inherent narrow band, and because more than one complete system is required to cover the different headings, not counting the problems with match beein
Hi all, I'm in search of an antenna modeling software that runs under a recent windows platform, i.e. XP. What I miss in applications of that kind I know is an automatic antenna optimization feature,
Thanks Wolfgang, 4nec2 and 4nec2X seems to be very much promising at the first glance, although the downodable version of the first is already 5.3.6. and I get a DLL error while trying to run a file
First of all I suggest You to forget about strange things like a 3 wire unipole. What you need is an omega match, that's all. The shunt feeding of a short monopole it's not the best way to feed becau
Independently by its peculiar high angle radiation, not every contact needs low angle radiation, an orizontal antenna close to a real ground has large losses that seriosly affect the overall efficien
Gains with low wires (i,e. beverages) & MiniNEC based software are generally (roughly) 6 dB in excess. Honestly, I do not understand NVIS advantages, but this is another story. 73, Mauri I4JMY
Note that inaccuracy is only relative to gain with real grounds. For example, if the model is well designed and has enough segments, AO perfectly deals with metal ground screens that assimilate a per
-- Initial Header -- To : antennaware@contesting.com Cc : Date : Tue, 21 May 2002 14:09:54 +0100 Subject : [Antennaware] Cylindrical Model for Triangular Tower Hi Bill, I'd make a scale model using a
The point is that director doesn't direct anything likewise reflectors doesn't reflect, moreover a director doesn't live an own independent life but is a part of the whole yagi array. Directors and r
Just a series of thoughts ... In case of horizontally polarized antennas placed at a reasonable height, the ground costants have a neglegible impact on the radiation pattern and efficiency, while the
The Hy Gain "CA" versions are, more or less, what you ask for. If I remember correctly, some of the "CA" models are included in K6STI YO modeled antenna samples. 73, Mauri I4JMY List Antennas and Tow
When a vertical is raised from ground, and such height is consistent in term of wavelenght, the gain at very low angles decreases. Since usual tribanders mostly mean 10 15 and 20m were useable elevti
I need info on professional grade modeling software. It must include also real terrain (shape) analysis, far field calculations and field plots (lines) over custom maps. Anything like productor, pric
Quad antennas are known as less affected by corona effects but I didn't find a trustable way to estimate the voltage developed at the highest impedance points. Did someone find the way to model the m
There's no modeling error but losses of various type are not taken in account. Also "forcing" the sources as pure current ones in a spacing where coupling among antennas is tight delivers more gain a
The primary purpose of a directional array should be that of improving gain and signal to noise ratio and, under this consideration it's not a benefit to ruin F/S and F/B of one antenna with the othe
Mike, in which direction would you like to have the gain ? To Asia with 2 antennas beaming Asia ? Yes, of course, if this is the question... If I understand correctly this last question, this is quit