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 YBN 22w
A 50 ohms direct feed 2 ele. Yagi with high potential
as broad beam Contest Stack. See yourself and compare to DJ9HO Double Quads and 7ZB Oblongs. Full details on 2 and 4 Yagi
stacks are given 3D Pattern of 4 x Stack
 YBN 25m (58)
1.6 m high F/R, good willing 50 ohms
direct feed Yagi as introduced with bent DE short version of the 58 in Dubus 4/2012 Elevation Plot
 YBN 28m (58)
3.6 m nice G/T, good willing 50 ohms
direct feed Yagi as introduced with bent DE expanded version of the 58 in Dubus 4/2012
Actually it seems to be so good that DK7ZB decided to use it as draft for the 8 ele. OWM he just published.
Elevation Plot
 YBN 210w (58)
5 m wide band, good willing 50 ohms
direct feed Yagi as introduced with straight DE expanded version of the 58 in Dubus 4/2012
Elevation Plot
 GTV 27n
3.1 m narrow band, max. G/T version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 28w
3.7 m wideband, still good G/T and nice F/B version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 28n
3.8 m narrow band, max. G/T version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 29n
4.3 m narrow band, balanced between low Antenna Temp. and G/T version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 YBN 210w 12.5 Ω
5.1 m  144.0 to 144.8 MHz wide band 12 ohms OWLstyle
Low Noise Yagi with straight DE and very low back lobes only Elevation Plot
 GTV 210LT
5.1 m moderate band width, lowest Antenna Temp. version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 211LT
6.0 m moderate band width, lowest Antenna Temp. version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 YBN 212w 12.5 Ω
6.8 m wide band 12 ohms OWLstyle
Low Noise Yagi with straight DE and very low back lobes only Azimuth Plot:
 GTV 212m mk2
Improved 6.8 m version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot:
 GTV 212n
6.8 m narrow band version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot:
 GTV 214w
8.4 m version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 216w
10 m version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 219m
12.4 m version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot

....... 
Performance Data and Geometry
Pattern and VSWR
Download as File
Stacking => 4 x 2 elem. vertical produce 13.5 dBi at a HPBW of 71 degr.
2 Element Yagi
This little Yagi is as much bandwidth as can be. A forgiving and easy to build alternative to the HB9CV.
It does not have the HB9CV's famous F/B ratio but is much easier to build, no phasing lines, no capacitor ...
Nothing to protect from rain and snow. When you ar portable with a little antenna and little rig anyway
a high F/B does not help much.
And note that the HB9CV's true gain is around 4.15 ... 4.2 dBD. No more then that.
The photo shows a build on 15 x 15 mm boom and symmetrising
Quarterwave Line grounded with an Ncableflange bushing.
Performance Data
Gain vs. isotr. Rad. 6.4 dBi
Gain vs. Dipole 4.3 dBD
3 dB Hplane 133.2 deg.
3 dB Eplane 69.6 deg.
F/B 9.0 dB
F/R 6.5 dB
Impedance 50 ohms
Mechan. Length 410 mm
Electr. Length 0.20 λ
Stacking Dist. hpol.
toptobottom 1.30 m
sidebyside n.a
Geometry
Pos. 1/2 Length BC 20x20 BC 25x25 BC 1"x1"
in NEC = 3.9 = 7.6 = 7.9
Refl. 0 506.0 1023.9 1036.6 1032.9
DE 410 463.0 995.9 999.6 999.9
ele. 8 mm ele. 8 mm ele. 3/8"
Note: element lengths for Ø 8 mm fit 5/16" too
The Driver Dipoles diameter is 10 mm for all examples.
Use EZNEC's AutoSegmentation at 144.3 MHz.
Pattern and VSWR Plots
Elevation and Azimuth plot
RL and SWR plot
Downloads
EZNEC file of this Yagi with Straight Split DE
EZNEC file of 2 x vertical stack
EZNEC file of 4 x vertical stack
Stacking 2 over 2
Elevation plot at 1.3 m distance
Note: the dipoles must be prolonged to 474 mm in NEC or plus 11 mm for
all ready to use measures due to impedance interaction at that close distance.
Gain vs. isotr. Rad. 10.2 dBi
Gain vs. Dipole 8.1 dBD
3 dB Hplane 45.8 deg.
3 dB Eplane 72.2 deg.
F/B 14.7 dB
F/R 14.7 dB
Stacking 4 x 2 vertically
Elevation plot at 1.3 m distance each
Note the different element positions and lengths of the inner Yagis  see drawing below.
Simulation at 4 m above perfect ground
Free Space Simulation
Elevation and Azimuth Plot and Data
Gain vs. isotr. Rad. 13.5 dBi
Gain vs. Dipole 11.4 dBD
3 dB Hplane 21.2 deg.
3 dB Eplane 71.0 deg.
F/B 17.7 dB
F/R 17.7 dB
These numbers are almost equal to the DJ9HO 4 x Quad. Gain is approx. similar,
HBW is a little wider, F/B almost similar. But as 4 x 2 ele. probably more handy for portable use.
The DK7ZB 4 x Quadlong is less high, just 2.85 m compared to the 3.9 m of the 4 x 2 element.
The 4 x Quadlongs gain is 2.1 dB less while F/B of the 4 x Quadlong is 2.2 dB higher.
73, Hartmut, DG7YBN

