Notice how these lengths produce an radiationresistance(impedance) close to 100 ohms. set lengthof dipole to multiples of 1/4 wave on each side (e.g. This antenna can be matched to 50 ohms by using a seriesinductor.Half of this antenna is 5/8 wave and is a common length for 2m mobileantennas.The 5/8 wave antenna is typically fed against a ground plane (car roof)andis usually matched with a tapped inductor. Notice that the radiation resistance (impedance) is about 90ohms. This is called an Extended Double Zeppantenna and produces the maximum gain possible from a simple center-feddipole. When a half-wave dipole is close to ground, the impedance isloweredto near 50 ohms. Radiation pattern shown is typicalfigure-8pattern. LinearDipole - set length to 0.5(half-wavelength dipole) and notice that theimpedance is near 73 ohms.
#Maa antenna files software
MMANAFreesoftware based on MININEC from DL2KQ-EU1TTĬocoaNECFreeNEC software for the Mac OS-X Tiger operating system by W7AY NEC2++ from Tim Molteno (discussionforum)ĪutoEZ,TLDetails&MoxGen by Dan Maguire AC6LA OrionMicrosytems:NEC4WIN MININEC Software'NEC4WIN95' - do not order fromKAGI?ĤNEC2 FreeNEC-2 software with excellent GUI - new web site 3-1-13 NEC-WinPlus, NEC-Win Pro, GNEC 'NittanyScientific' - now out ofbusiness NEC/MININEC-basedSoftware Vendors:ĮMScientific:'New'MININEC Free'Expert MININEC Classic' software - badlink?
#Maa antenna files windows 7
His older versions will not work in Windows 7 and 8. Note: K6STI's AO and YO software no longer available. NEC Software for Yagi Design Software / Version / Author Modelers can use the gradient style and/or the genetic algorithm based optimizers to improve their designs. With the sweeper one is able to graphically display the effect of changing one or more of these variablesįor a specified range of values/frequencies.įor the starting modeler a graphically based 3D geometry-editor is included which requires no additional NEC knowledge while stillĮnabling you to create and visualize and compare current-distribution, far/near-field patterns and Gain/SWR charts. Included Optimizer and Sweeper one is able to optimize antenna- and/or other environment-variables for Gain, resonance, SWR,Įfficiency and/or F/B, F/R-ratio. When running frequency sweeps, linear or logarithmic style SWR, Gain, F/B-ratio and impedance line-charts are produced.
#Maa antenna files free
4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D styleĪntenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced
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