Performance Data and Geometry
Pattern and VSWR
Download as File
Stacking


YBN 50-4w Yagi   with straight split dipole

A short 6m Band Yagi in OWA-style.

This shorter Yagi is designed for easest reproduction, straight split DE and direct feed
with 50 ohms at feed point. Date of issue of design: 2026-06-30.

Use a large ferrite core, coax choke 'balun' made out of several windings on a close diameter ... or a grounded Quarter Wave
Line for best results. Generally it does work without any symmetrising, but a test config with a clap on ferrite for Analyser
plotting or simply SWR check is appreciated.

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YBN 50-4w built by John, PA7JB

Return Loss and Smith-Chart, span 45.0 to 55.0 MHz (Note the 2 m Yagi in proximity):

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Performance Data

                   Elem. 12 mm
Gain vs. isotr. Rad.   8.2 dBi
Gain vs. Dipole        6.1 dBD
-3 dB E-plane         62.8 deg.
-3 dB H-plane         99.6 deg.
F/B                  -22.0 dB
F/R                  -12.2 dB
Impedance               50 ohms
VSWR Band Width     1.04:1 *
Mechan. Length        2337 mm incl. 2 x 40 mm Offset
Electr. Length        0.38 λ

Stacking Dist. h-pol.
top-to-bottom         3.92 m
side-by-side          5.74 m

*) as in VE7BQH G/T table = at 50.50 MHz

Geometry

Elements Ø12 mm:

Stauff Clamps 2-12-PP plus screws M6 x 65 +/- depending on boom size

The boom correction is added in the above table. It fits hydraulic claps like 'Stauff' and booms 20 .. 25 mm.

How many pageviews did this design get since Sept. 2026?

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Pattern and VSWR Plots, 12 mm ele.

Elevation and Azimuth plot at 50.1 MHz

 

RL and SWR plot - simulated / 49.5 - 52.0 MHz

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Downloads

None so far.

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Stacking

Stacking Dist. acc DL6WU Formula, Dopt
H-plane               3.92 m
E-plane               5.74 m

Elevation plot of 4 over 4 with extra reflector mid way, same length and position as other reflectors
at 50.1 MHz using DL6WU stacking distances:

 

Gain vs. isotr. Rad.  11.43 dBi
Gain vs. Dipole        9.3 dBD
-3 dB H-plane         42.2 deg.
-3 dB E-plane         62.2 deg.
F/B                  -26.2 dB
F/R                  -15.8 dB

73, Hartmut, DG7YBN