DG7YBN / 1296 MHz / YBN 23-5m
  Last Update Mar. 8th, 2022


Performance Data and Geometry
Pattern and VSWR
Download as File

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

Performance Data

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

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This Yagi with 4 mm elements through a 7.5 x 7.5 mm plastic boom

Ele. 4.0 mm
DE 4.0 mm
Boom 7.5 x 7.5 mm ABS Plastic

Ele. fastening &. photo acc. F4FEY

"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

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