Performance Data and Geometry
Pattern and VSWR
Download as File
YBN 4m-5m Yagi with straight split dipole
This little Yagi has a high F/B and altogether very little back lobe volume
The design is a blueprint of the 5 ele. 144 MHz BC measurement Yagi with 50 ohms at feed point for direct feed.
With no high segmentation correction or complex radiators involved this design is pretty much a straight forward
simple building yet performing antenna. For stacking examples, patterns and data see the website of the
YBN 2-5m see here
YBN 4m-5m build by Andreas, DK2CF
This Yagi is build on a boom 25 x 25 mm.
Andreas reports a VSWR of 1:1.13 at 71.01 MHz without final trimm.
Photo Credit: DK2CF, tnx Andreas!
Gain vs. isotr. Rad. 10.2 dBi Gain vs. Dipole 8.0 dBD -3 dB E-plane 54.8 deg. -3 dB H-plane 73.2 deg. F/B -25.2 dB F/R -23.3 dB Impedance 50 ohms Mechan. Length 3055 mm Electr. Length 0.72 λ Stacking Dist. h-pol. top-to-bottom 3.58 m = 11.8 ft side-by-side 4.64 m = 15.2 ftGeometry
No SBC needed since designed with auto segmentated wires at designated frequency => Free Space Geometry ready to apply a BC according planned style of building
The Drivers diameter is 16 mm
Refl DE D1 D2 D3 Pos. 0 582 829 1691 3055 Ele. 2118 2044 1966 1914 1766 Diam. 12 16 12 12 12
Pattern and VSWR Plots
Elevation and Azimuth plot at 70.15 MHz
RL and SWR plot - simulated
EZNEC file of this Yagi (12 mm ele.)
73, Hartmut, DG7YBN