Performance Data and Geometry
Pattern and VSWR
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YBN 23-5m Yagi with straight Driven Element
A short and easy to build 23 cm Yagi that provides a clean pattern and good 10 dBi of gain.
This is the scaled version of the well tested 2 m band YBN 2-5m. Design date of issue: 2020.12.29
YBN 23-5m by Maxime, F4FEY:
This Yagi was built according scaling the 2 m version YBN 2-5m by Kazuo, 7L1TIG.
See his website here . Thank you Kazuo!
YBN 23-5m by Olgierd, SQ3SWF:
Olgierd reports: "I decided to print your 5el for 23cm design for use with HT, since the whole boom easily fits on the bed of my 3D printer."
He has drawn the whole boom in 3D and shares the print file incl. source code here: https://www.thingiverse.com/thing:5277749
Photo Credit: SQ3SWF. Tnx Olgierd!
YBN YBN 23-5m 3D pattern plot at 1296.2 MHz
Specs: with 4 mm elements @ 1296.2 MHz
Gain vs. isotr. Rad. 10.3 dBi Gain vs. Dipole 8.2 dBD -3 dB E-plane 53.6 deg. -3 dB H-plane 70.0 deg. F/B -23.2 dB F/R -21.6 dB Impedance 50 ohms VSWR Band Width 1.15:1 * Mechan. Length 160 mm plus 2 x 15 mm offset Electr. Length 0.69 λ Stacking Dist. h-pol. (1296.2 MHz) top-to-bottom 0.202 m or 0.66 ft side-by-side 0.256 m or 0.84 ft *) at 1300.0 MHz
How many VHF operators have been looking up this design since Dec. 2020?
This Yagi with 4 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.
Nothing yet ...
73, Hartmut, DG7YBN