DG7YBN / 70 MHz / YBN 4m-8m
  Last Update Aug 09th 2014




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Performance Data and Geometry
attern and VSWR
Download as File


YBN 4m-8m Yagi   with straight split dipole



This full size 4 m Yagi has a high F/B and altogether very little back lobe volume
The design is a blueprint of the 5 -8 concept 8 ele. 144 MHz Yagi design 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 2-8m see here





Performance Data

Gain vs. isotr. Rad.  13.2 dBi
Gain vs. Dipole       11.0 dBD
-3 dB H-plane         54.8 deg.
-3 dB E-plane         47.0 deg.
F/B                  -25.4 dB
F/R                  -19.3 dB
Impedance               50 ohms
Mechan. Length        7159 mm
Electr. Length        1.67 λ

Geometry


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      D4      D5      D6
Pos.           0     582     829    1691    2958    4375    5854    7159     
Ele.        2118    2044    1966    1914    1892    1850    1844    1766
Diam.         12      16      12      12      12      12      12      12








Pattern and VSWR Plots

Elevation and Azimuth plot at 70.15 MHz

 


RL and SWR plot - simulated










Downloads

EZNEC file of this Yagi (12 mm ele.)  









73, Hartmut, DG7YBN



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