DG7YBN / 144 MHz / YBN 2-10w
  Last Update Sept. 15th 2014




.......



Performance Data and Geometry
Pattern and VSWR
Download as File


10 Element Yagi   with Conventional Driver (Split or Folded Dipole)

This is the third extension of the original 5-8 concept. Now there are 3 buiding blocks. Starting with the YBN 2-5m,
extension No. 1 to the YBN2-8m and finally to the YBN2-10w. They all use the same Driver Cell elements and dipole.
Thus one can swap between various setups like 5 over 5 to 4 x 8 elem. or to 4 x 5 ele. vertically or now even any
2 x 10 ele. or full 4 bay of 10 elements very easily.

The YBN2-10w is a real low Q Yagi. The G/T is not spectacular - though solid average still - but this is a very
forgiving design suitable to be built by everyone and anyone. There is an off the shelf Folded DE with Balun etc.
available for these three blocks even.

Just as time, place and WX conditions demand. Read the full text in Dubus magazine issue 4/2012





Performance Data

                     Elem. 8 mm
Gain vs. isotr. Rad.  14.3 dBi
Gain vs. Dipole       12.1 dBD
-3 dB H-plane         37.2 deg.
-3 dB E-plane         41.0 deg.
F/B                  -23.5 dB
F/R                  -23.5 dB
Impedance            50/200 ohms
Mechan. Length         4950 mm
Electr. Length         2.38 λ

Stacking Dist. h-pol.
top-to-bottom          2.97 m (10.70 ft)
side-by-side           3.26 m ( 9.75 ft)
            


EZNEC wires window : Straight Split DE Version


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

Ø8 mm Elements exclusive boom in free air

            Refl      DE      D1      D2      D3      D4      D5      D6      D7      D8
Pos.           0     283     403     822    1440    2130    2850    3580    4325    4950     
Ele.        1029     992     950     932     909     886     878     876     872     834
Diam.          8      10       8       8       8       8       8       8       8       8


Ø8 mm Elements insulated on 25 x 25 mm Boom - Dimensions (BC acc. DG7YBN)

            Refl      DE      D1      D2      D3      D4      D5      D6      D7      D8
Pos.           0     283     403     822    1440    2130    2850    3580    4325    4950     
Ele.      1036.6  (999.6)  957.6   939.6   916.6   893.6   885.6   883.6   879.6   841.6
Diam.          8      10       8       8       8       8       8       8       8       8



Here is a very helpful overview on the stages of the YBN 5- 5 / 8 / 10 ele. project provided by Stef, F4EZJ
It shows what elements are shared and different at what positions on the boom for the various combinations

Note: Lengths given fit elements mounted on a 20 x 20 mm boom with 'standard insulators' and M3 screw



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Pattern and VSWR Plots



Elevation and Azimuth plot at 144.1 MHz - Version with Folded Dipole from WiMo EF0208c

 


RL and SWR plot












Downloads

EZNEC file of this Yagi with Straight Split DE  

EZNEC file of this Yagi with Folded DE  






Stacking


Stacking Dist.    DL6WU Formula
H-plane               2.97 m
E-plane               3.26 m

Data of 4 Yagi stack using DL6WU stacking distances


Gain vs. isotr. Rad.  20.1 dBi
Gain vs. Dipole       18.0 dBD
F/B                  -28.2 dB
F/R                  -28.2 dB
T_ant                234,9 K*
G/T                  -3,58 dB* (straight split DE version)
Theoretical numbers, no phasing line losses
nor imperfections caused by H-frame included
*) T_sky = 200 K, T_earth = 1000 K as in VE7BQH G/T table

Elevation plot



TANT screenshot










73, Hartmut, DG7YBN


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