MMANA-GAL Antenna Modeling Program Author: Makoto (Mako) Mori JE3HHT © 1999-2000 Gontcharenko Gary DL2KQ-EU1TT developed and released English versions of MMANA in 2001-2002. Nobuyuki Oba JA7UDE wrote an English user manual in 2001.
Software beta testing was provided by a group of fellow amateurs. M MANA is an antenna analyzing tool based on the moment method introduced in MININEC (Mini Numerical Electromagnetics Code) Version 3. MININEC should not be confused with NEC, which is a large antenna analysis program written in FORTRAN and designed to run on main-frame computers. Early versions of MININEC were written entirely in BASIC and the computation engine source code was published as a PDS in MININEC Version 3. That BASIC source code was ported to C and compiled to provide faster and more memory-efficient computer execution.
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A graphical user interface also was added that makes MMANA much easier to use than MININEC version it was ported from. (Some portions of later versions of MININEC are written in FORTRAN.) Most professional antenna modeling is now done with later versions of MININEC that have important improvements. However, Version 3 has one big advantage compared to later versions.
It costs you nothing! Furthermore, even though it is outdated, its capabilities are adequate to model most antennas commonly used by amateurs. The radiation field produced by a transmitting antenna system having any known arbitrary current distribution can be found by adding the separate fields produced by elementary lengths of thin conductors with each elementary length treated as a very small radiating doublet antenna. In adding the contributions to the total field that are made by the individual doublets that can be considered as making up the actual current distribution of an antenna it is necessary to take into account the phase and the plane of polarization of each contributing component field. Those field strength summations can be done by either graphical or mathematical integration. Many excellent examples of both graphical and mathematical methods appeared in literature printed prior to 1940, for example, F. Terman, Radio Engineering, 2d ed, p.
658, McGraw-Hill, New York, 1937. The MININEC moment method of far field radiation calculation is a mathematical integration method based in principle upon the fundamental concept of summing fields from many small elemental sections of thin antenna conductors that compose an antenna system. Information about the moment method of far radiation field determination has appeared in Amateur Radio literature. For example, Hiroaki Kogure, 'Antenna design using PC,' CQ Publishing, April 15, 1998, and Matsuda-san JA1WXB 'Theory and experience of antenna simulation,' Ham Journal No.
95, CQ Publishing. However, those two examples are written in Japanese and are believed to be available only in Japan. The mathematical calculations required to perform far radiation field integrations are complex and laborious to do manually, but MMANA uses an improved ( faster and requiring less memory) MININEC computation engine to do the work for you. You can simply describe an antenna, or load an antenna description file someone else has created, click a Start button, and MMANA will calculate and plot the vertical and horizontal far field radiation patterns of the antenna for you. It also will calculate the feed impedance, feed-line SWR, bandwidth, and other things. However, the 'Garbage In, Garbage Out,' rule applies especially well to MMANA and other antenna modeling programs. Fail to describe an antenna properly or ask MMANA to do something that is beyond its capabilities, impossible, or stupid and it will give you either no results or misleading results.
MMANA is a very capable and valuable tool if used correctly, but like with most sophisticated tools, correct use requires a certain amount of understanding and care.
73 Magazine April 1979 (#223) A Speedy Spinner Mod - 5,000,000 Hz per minute. Peak by chip conley ebook download. W2RZJ 40 A Variable Bandpass Active Filter - extremely simple design.
W3KBM 42 What About an Active Antenna? - here's a look at one.
W5JJ 44 Help for the Hearing-Impaired - don't miss another phone call. W4VRV 56 Try a Bi-Loop Antenna - gets you coming and going. W7CJB 58 Simple RTTY IDer - uses five ICs. G3MEJ 60 Tales of Speech Processing - including a practical design. WA4JHS 62 PTT For Ten-Tec's Linear - no more 'aahhh' and 'uuhhh'. DA1NF/WD6AXL 68 Disaster Preparedness - it can happen here. N4AL 74 Comfort Mods for the Mark II - invert your duck.
WA4HUZ 78 An 8080 Repeater Control System - part III: software. N3IC 82 The Micro Duper - for small contests. WB2MIC, WA2RZR 96 An 8080 Disassembler - written in BASIC, yet! Raskin 98 Antenna Bonanza for 10 - CB is good for something.
W6LVT 102 Lightning! - a case history.
W8HXR 104 Build a CW Memory - fun! WA1ZFW 106 Wire-Wrap on a Budget - home-brew your tools. K4LPQ 108 Compact Continuity Tester. Miller 116 Who Needs SSB? - using your FT-101 on 10m AM. K8JS 118 12 Volts, 5 Amps, 3 Terminals - what could be simpler?
WA4FYZ 120 Has Anyone Seen OSCAR 7? - find it with your SR-56. Mayse 122 Tricky QSK - a treat for CW. Blasco 124 Make Life Easier - with a workbench speed control. W4CQQ 126 The Heath/Kenwood Connection - RIT for the 104. WB5QGI 128 An 8-Element, All-Driven Vertical Beam - super array for DX.
W1DBM 132 CW with a Nordic Flair - new life for the Viking I. K2VJ 146 House Hunting for Hams - caveat emptor! WB9URA 150 Index courtesy of.
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An excellent collection of vintage farming equipment manuals can be found in the in the Americana collection.
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The Internet Archive Manual Library is a collection of manuals, instructions, walkthroughs and datasheets for a massive spectrum of items. Manuals covering electronic and mechanical products, instructions on mixing or blending items, and instruction sets for software and computer items are all included. Having the manual for an item can mean the difference between that item being useful (and therefore not immediately junked) and being forgotten, or replaced with similar products. They also give insight into the intentions and goals of the companies making these products, as well as avenues of troubleshooting and repair. An excellent collection of vintage farming equipment manuals can be found in the in the Americana collection. DESCRIPTION The Internet Archive Manual Library is a collection of manuals, instructions, walkthroughs and datasheets for a massive spectrum of items. Manuals covering electronic and mechanical products, instructions on mixing or blending items, and instruction sets for software and computer items are all included.
Having the manual for an item can mean the difference between that item being useful (and therefore not immediately junked) and being forgotten, or replaced with similar products. They also give insight into the intentions and goals of the companies making these products, as well as avenues of troubleshooting and repair.
An excellent collection of vintage farming equipment manuals can be found in the in the Americana collection.