Performance Data and Geometry
Pattern and VSWR
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YBN 23-9m Yagi with straight Driven Element
A short and easy to build 23 cm Yagi that provides a clean pattern and almost 14 dBi of gain.
This is the scaled version of the 2 m band YBN 2-9m. Design date of issue: 2020.12.29
YBN 23-9m pioneer build by Maxime, F4FEY (thanks Maxime!).
The Yagi is build on Boom 7.5 x 7.5 mm ABS Plastic using 3 mm elements and 4 mm dipole.
YBN YBN 23-9m 3D pattern plot at 1296.2 MHz
Specs: with 3 mm elements @ 1296.2 MHz
Gain vs. isotr. Rad. 14.0 dBi Gain vs. Dipole 11.8 dBD -3 dB E-plane 38.4 deg. -3 dB H-plane 42.6 deg. F/B -26.3 dB F/R -23.1 dB Impedance 50 ohms VSWR Band Width 1.06:1 * Mechan. Length 499.4 mm plus 2 x 15 mm offset Electr. Length 2.15 λ Stacking Dist. h-pol. (1296.2 MHz) top-to-bottom 0.318 m or 1.04 ft side-by-side 0.352 m or 1.15 ft *) at 1300.0 MHz
How many VHF operators have been looking up this design since Dec. 2020?
This Yagi with 3 mm elements through a 7.5 x 7.5 mm plastic boom
"Ready to saw and drill" data for mounting elements through this plastic boom:
The Drivers diameter is 4 mm.
The EZNEC model is done with Auto-Segmentation at 1296.2 MHz
Pattern and VSWR Plots
Elevation and Azimuth plot at 1296.2 MHz
Return Loss and SWR plots - simulated
None so far.
73, Hartmut, DG7YBN