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NAMEoutput - Yagi-Uda project antenna display programSYNOPSISoutput [ - cehps ] [ -EE_max ] [ -HHmax ] [ -rminimum ] [ -Rmaximum ] [ -ZZo ]filename DESCRIPTIONThe program output is one of a number of executable programs that forms part of a set of programs, collectively known as the Yagi-Uda project , which were designed for analysis and optimisation of Yagi-Uda antennas. output calculates the gain, FB ratio, input impedance etc etc of an antenna that was described by the program input or first and has had the element currents calculated with the program yagi The data about the forward gain, VSWR, FB ratio, input impedance etc is written to a file filename.dat Angular data, giving the variation of gain with theta and phi is put into a file filename.gaiSometimes the program fails to find the 3dB bandwidths in the E and H planes, and bombs out with a 'zbrent' error. This can occur if: (1) The antenna has an almost isotropic pattern, in which case its never 3dB down, so the 3dB point is undefined. (2) The 3dB point is outside the assumed angular range. You then have to either: (a) Calculate with the -e option, which avoids calculation of the 3dB E-plane beamwidth or (b) Do (a) above, then find approximately where the 3dB point is (from the .gai file -see later), then set options -E and -H so the program calculates them properly. The DOS .EXE files as distributed require a 387 maths coprocessor to be present and will not run without it. A 486, Pentium, and I assume later processors of this series will run it without any extra hardware. The DOS files are no longer being maintained, so are out of sync with the latest source. OPTIONS
LimitationsI'm not aware of any limitations, apart from that filenames, including full path, can't exceed 90 characters.FILESfilename ASCII file with antenna description. filename.out Binary data file, created by yagi. filename.dat ASCII file with gain, FB ratio etc. filename.gai ASCII file with angular dependence of gain. SEE ALSOfirst(1), input(1), yagi(1), optimise(1).PLATFORMSBoth DOS and Unix versions have been built. The DOS version as distributed requires a 386 PC with a 387 maths coprocessor.BUGSBugs should be reported to david.kirkby@onetel.net. Bugs tend actually to be fixed if they can be isolated, so it is in your interest to report them in such a way that they can be easily reproduced. The program gives errors if element lengths are well away from a half-wave (by a factor of ~3) due to a breakdown in the equations. If the input file is edited manually and done incorrectly, there can be unpredictable results.AUTHORSDr. David Kirkby G8WRB (david.kirkby@onetel.net). with help with converting to DOS from Dr. Joe Mack NA3T (mack@fcrfv2.ncifcrf.gov)
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