Readings you make at the shack end of the line will then be the same as if you had made them directly at the antenna.Licensed Amateur Radio operator in 1996 as IW5EDI, active member of ARI Firenze and ARRLĬlass 1970, married with two childrens, love experimenting and antenna home-brewing. Then reconnect the feedline to the antenna and make measurements over the frequency range of interest. This will move the reference plane of your instrument to the antenna feedpoint, effectively 'calibrating out' the transmission line. As explained inAppendix 1 of the Zplots documentation: The most accurate way to make antenna measurements is to temporarily disconnect the far end of the transmission line from the antenna, place OSL (Open-Short-Load) terminations at the far end, connect the shack end of the line to your instrument, and perform a calibration. For example, if your AutoEZ model has calculated impedance values at the center of a dipole 30 ft in the air then your measurements should be at that same point, not at the lower end of 30 ft of transmission line. To make meaningful comparisons between measured and modeled it is important that you keep in mind the reference plane of your measuring device. Added mm (MilliMetres) as a units option. Replacement 6.2.61 exe (zipped) Here Changes 6.2. Fixed bug with options not saving/loading correctly. Corrected problem with reference yagi gain, now shows in same units as main gain.
Roy Lewellen (W7EL), followed with eznec and elnec, nec based programs. K6STI produced YO (Yagi Optimizer) and AO (Antenna Optimizer), mininec based programs. Nec and mininec followed and Brian Beezley. Fortran based in the beginning and then in basic. YA is a reduced version of the 'Yagi Optimizer' and calibrated to NEC, the high-accuracy Numerical Electromagnetics Code from the Lawrence Livermore National Laboratory. I recalculated these data using the 'Yagi Analysis V3.54' by Goran Stenberg, SM2IEV and 'YA - Yagi Analyzer' by Brian Beezley, K6STI.
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