Amateur radio in 2013

Amateur radio in 2013

Ham antennas

End. Beginning at №7 / 2013

The book «Antennas» K. Rothammelya in its several editions — it is a huge and important part of amateur radio education and self-education of the 1970s-1980s. The book is full of direct errors, inaccuracies and exaggeration, but it is impossible to downplay its concrete benefits for the vast mass of amateur radio operators. However, nothing stands still, and now there are books of another professional level, and other tools, which previously could not even dream for the simple reason that they did not exist. It is a computer simulation of antennas. One of the computer programs modeling antennas, more precisely, even a group of related programs at one time was a free program MMANA Japanese radio amateur Makoto Mori, JA3JHE. By the time the MMANA already existed a program that allows modeling at a high level, but he was able to make a program with a very simple and intuitive graphical interface. After that, antenna modeling is no longer a lot of professionals and reached the level of a conventional radio amateur. On the level of intuition can be judged from the fact that the user interface was in Japanese, but with some practice, you can use the program without the knowledge of the language. After the appearance of the interface translation into English of the program has received tremendous popularity worldwide. This was followed by its translation into Russian, and later still the source code of the program proved to be a group of enthusiasts in Germany, and the program continued its further development.

The program currently received and the «advanced» commercial version, and still has a free version. Due to the very advanced processing it has lost its original name and is now called GAL-ANA. Description and some screenshots of the free version are on the website (http://gal-ana.de/basicmm/ru/), and the link to download the program — at the bottom of this page.

With this antenna modeler, you can spend hours at the computer, if not days, creating an antenna, changing their elements by moving them up or down, analyze for themselves the dependence of parameters obtained from the height of the soil surrounding the objects and so on. After reading this Honourable K. Rothammelya becoming increasingly nostalgic and academic part of his several books pales.

Well, it’s time to mention the developers of the program GAL-ANA — Alexander Shevelev, DL1PBD, and Igor Goncharenko, DL2KQ (ex EU1TT). I. Goncharenko wrote and published a series of books about amateur radio antennas «Antenna. HF and VHF. » Currently published 6 parts of this publication. The book was originally designed as an interactive, with a mass of references for another program MMANA. This book is strongly recommend, because it is, in spite of the availability of the necessary, deep enough, the academic foundations, written in a lively and understandable language. Suffice complex phenomena and processes are painted at a level accessible perception of even the most novice. The book is available for sale, and some sections are available on the website of the author (http://www.dl2kq.de).

Concluding the topic of books for modern hams mention the tremendous work that has become almost academic. This is a book «Low Band DXing» Belgian radio amateur John Devoldere, ON4UN. 672 pages of text and pictures (in the last 5th edition) describe and clarify various aspects of propagation of radio waves, in particular to lower frequency bands, amateur radio equipment, and especially the various types of antennas.

In discussing the antenna, it makes sense to also mention another important modern tool for amateur radio — antenna analyzers. This portable industrial instruments, allowing to measure directly and visually evaluate the most important parameters of amateur antenna: impedance, VSWR, resonant frequency, gain, and others. There are devices that output this information to a graphic display. Accordingly, it is possible to obtain graphs of each of the controlled parameters in a particular frequency range, to visually determine the resonance frequency, to detect unwanted resonances to evaluate the bandwidth of the antenna, etc. There are devices that will appear on the display the required information at the same time for 5 bands that dramatically simplifies setup mnogodipazonnyh antennas.

Vladimir Sidorov, EU1M (ex EU1SA), VE3IAE.

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