DG7YBN / 1296 MHz / YBN 23-9m
  Last Update Jan. 10th, 2021


Performance Data and Geometry
Pattern and VSWR
Download as File

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

Performance Data

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?

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This Yagi with 3 mm elements through a 7.5 x 7.5 mm plastic boom

Ele. 3.0 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.

73, Hartmut, DG7YBN

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