Note WIDE BEAMWIDTH Azimuthal Antenna Pattern with 70-60 degree Beamwidth, deceasing with Frequency. I took all measurements directly from Antenna, which includes a built-in 1:1 Balun. () UHF 5-Element FLAT Yagi, Channel Master CM-4040, analyzed using 4nec2. PS: Jointly Optimizing UHF and Hi-VHF should improve Hi-VHF performance, perhaps at expense of UHF.Ħ30 Visits 28 Images Shared Album 3. But Hi-VHF SWR (300-ohms) is Very EXCESSIVE. Nearly Bi-Directional Hi-VHF Gain = -0.5 to 0.4 dBi FORWARD and -0.4 to 0.6 dBi to REAR is slightly HIGHER and nearly OMNI-Directional. Note well formed Azimuthal Antenna Pattern with 70-50 degree Beamwidth, deceasing with Frequency. = 13.4 dB (GOOD) and SWR under 3.1 (GOOD). UHF Raw Gain = 7.3 to 9.4 to 8.9 dBi, F/B & F/R Ratio Min. Gain, SWR F/B & F/B performance better than CM-4040 5-El FLAT Yagi.
() UHF 5-Element Folded Dipole Yagi, OPTIMIZED using nikiml's Python Scripts, analyzed using 4nec2. Includes References and explanations: Date(s): June 19, 2009.
Hi-VHF YA-1713 10-El Log-Yagi webpage contains Boom Correction Calculator Spread Sheet example that can be used for other antennas. For a 1-in Boom (Circular or Square), the extra Passive Element Half-Length is 0.25-in or LESS, and for a 1/2-in Boom, the Boom Correction is only 0.1-in or LESS.
UHF 13-El FD-Yagi (2RR) webpage contains Spread Sheet Boom Correction Calculation Examples, based on a variety of references sources (note disagreements). Boom Corrections are NOT needed if using a non-metallic boom (e.g. Note that the amount of Boom Correction varies, depending on whether Insulated or Bonded to the Boom and derated (reduced) for being on TOP and if Isolated ABOVE or BELOW the Boom, which explains why there is usually NO BC for Active Elements. To compensate for the missing Boom, 4nec2 optimized dimensions for Element Length must be INCREASED by the amount of the BOOM CORRECTON when cutting actual Metal. If change to a 'standard' sized element diameter.īOOM CORRECTIONS: Most NEC Yagi models intentionally leave out the Metallic Boom since it requires many more segments that greatly slow down the simulation. Invert ratio to enlarge a design for a lower frequency Band.
#K6STI YAGI OPTIMIZER DOWNLOAD SOFTWARE#
YagiCAD - A freeware windows antenna design and modelling software developed. YO.exe is still today used to optimize Yagi Antennas. YO Yagi Optimizer by K6STI is an old MSDOS based antenna modelling software that has been very popular among ham radio community. To Rescale a New UHF Band Antenna (if peak on CH51) to center of 2.400-2.485 GHz Wi-Fi Band, shrink ALL Dimensions (incl. Nearly ANY Antenna Design can be Rescaled to dimensions appropriate for another Band (incl. UHF 5, 6, 7, 8, 12, 13, 15, 16, 18, 23-Element and 91XG (23-Element + Corner Reflector) Yagi Antennas performance analyzed using 4nec2. Yagi Antennas - ImageEvent holl_ands >Yagi Antennas Yagi Antennas Hi-VHF 4, 5, 8, 9, 12, 13, 16, 18, 20 and 22-Element Yagi Antennas performance analyzed using 4nec2.