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- YBN 3+7 SAT
A Satellite Yagi with 3 ele. for 145 MHz + 7 ele. for 435 MHz for handheld use
Elevation Plots

- YBN 2-2w
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 2-5m (5-8)
1.6 m high F/R, good willing 50 ohms
direct feed Yagi as introduced with bent DE short version of the 5-8 in Dubus 4/2012 Elevation Plot

- YBN 2-8m (5-8)
3.6 m nice G/T, good willing 50 ohms
direct feed Yagi as introduced with bent DE expanded version of the 5-8 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 2-9m
4.5 m moderate band width, low Antenna Temperature, good willing 50 ohms
direct feed Yagi - a straigh DE version twin to the GTV 2-9m
Elevation Plot

- YBN 2-10w (5-8)
5 m wide band, good willing 50 ohms
direct feed Yagi as introduced with straight DE expanded version of the 5-8 in Dubus 4/2012
Elevation Plot

- GTV 2-6m
2.4 m moderate band width version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot

- GTV 2-7n
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 2-8w
3.7 m wide-band, 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 2-8n
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 2-9n
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

- GTV 2-9m
4.5 m moderate band width, low 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 2-10w 12.5 Ω
5.1 m - 144.0 to 144.8 MHz wide band 12 ohms OWL-style
Low Noise Yagi with straight DE and very low back lobes only Elevation Plot

- GTV 2-10LT
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 2-11LT
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 2-12w 12.5 Ω
6.8 m wide band 12 ohms OWL-style
Low Noise Yagi with straight DE and very low back lobes only Azimuth Plot:

- GTV 2-12m 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 2-12n
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 2-14w
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 2-16w
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 2-18w
11.7 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 2-19m
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

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Performance Data and Geometry
Pattern and VSWR
Simulated Wet+Snow Degradation and more
Download as File
Stacking ... NEW
UR5EAZ 7 ele. S BDE 2740 mm Yagi with bent dipole
I am proud to host UR5EAZ, Vladimir with his very wide band, high G/T 7 elem. Yagi design:
Vladimir does not have an own website but this nice design, so I decided to share a bit of my webspace.
Design, images and analysis are the property of UR5EAZ. You find his email address at the end of this site.
The 7 ele. S BDE is a responding design to the DG7YBN GTV 2-7n. But with very defined low
average Antenna Q-Factor of 3.0 from 144 ... 146 MHz. The 'S' in its name stands for 'Stability'
in VSWR and Antenna-G/T in all conditions. The driven element is a 1:1 copy of the bent
dipole I use as a modified K6STI version (BDE = Bent Drive Element). In case you wish to
contact the designer you find Vladimirs email address on the end of the page.


Performance Data of this Yagi at 144.3 MHz
7.5 mm 8.0 mm
Gain vs. isotr. Rad. 12.5 dBi 12.5 dBi
Gain vs. Dipole 10.3 dBD 10.3 dBD
-3 dB H-plane 43.8 deg. 44.0 deg.
-3 dB E-plane 51.4 deg. 51.8 deg.
F/B -23.3 dB -25.4 dB
F/R -21.5 dB -21.4 dB
Impedance 50 ohms 50 ohms
Mechan. Length 2745 mm 2740 mm
Electr. Length 1.32 λ
Stacking Dist. h-pol. DL6WU
top-to-bottom 2.40 m
side-by-side 2.79 m
UR5EAZ adds that the exact Z of the NEC models is
7.0 mm vers. Zo = 50.06 + j 0.001 ohms (144.3 MHz)
Zo = 50.24 + j 0.34 ohms (145.0 MHz)
VSWR (145.0 MHz as in VE7BQH G/T Table) = 1.008
7.5 mm vers. Zo = 50.12 + j 0.025 ohms (144.3 MHz)
Zo = 49.88 + j 0.05 ohms (145.0 MHz)
VSWR (145.0 MHz as in VE7BQH G/T Table) = 1.003
8.0 mm vers. Zo = 49.87 + j 0.013 ohms (144.3 MHz)
Zo = 50.11 - j 0.035 ohms (145.0 MHz)
VSWR (145.0 MHz as in VE7BQH G/T Table) = 1.002
Geometry


References and further Read on Antenna Q-Factor and Stability in Wet Weather cdx acc. YU1AW
Vladimir, UR5EAZ suggest the following read:
YU1AW's article 'Wet Antennas', antenneX Issue 134 - June 2008
YU1AW's article 'Performances of Wet Yagi Antennas', antenneX Issue 136 - Aug. 2008
YU1AW's article 'Yagi Antenna Design Sensitivity in Practice ', antenneX Issue 139 - Nov. 2008
YU1AW's website on VHF / UHF Antennas

Pattern and VSWR Plots
Elevation and Azimuth plot at 144.3 MHz

Gain, F/B and F/R 144.0 to 146.0 MHz - simulated with 4nec2

SWR and Return Loss plots - simulated with 4nec2

Antenna Temperature and G/T for a single UR5EAZ 7 S BDE (Tearth = 1000 K, Tsky = 200 K), elem. 7.5 mm
For data of 4 bay see below in • Stacking


NEC simulated degradation due to bad weather according the theory of YU1AW
Simulated layers of water, snow or ice are derived at by manipulating numbers for Dielectricum of wire = element insulation and its thickness.
Though match of numbers to real wet, snow covered or iced over Yagis are unknown yet, the intention is to show how stabile this design behaves
even under severe manipulation of the element's environment. (Chart by UR5EAZ)
• UR5EAZ produced Table of VSWR, wet moist simulted through different layers of wire insulation in (4)nec2

The UR5EAZ 7 ele. S BDE in "Unusual application of the TANT program, vers 3.1"
• UR5EAZ produced Table of Echo SNR analysis with his "Unusual application of the TANT program, vers 3.1" Excel
For more abt. this MS Excel & Download see here


Downloads
EZNEC file of this Yagi with 7.0 mm Elements
EZNEC file of this Yagi with 7.5 mm Elements
EZNEC file of this Yagi with 8.0 mm Elements
EZNEC file of 4 Yagi Bay with 8.0 mm Elements

Stacking: 4 Yagi Bay
4 x UR5EAZ 7s BDE, 8 mm elements
stacked to DL6WU distances h.-pol.
top-to-bottom 2.37 m = 7.78 ft
side-by-side 2.76 m = 9.07 ft

Elevation and Azimuth Pattern

Antenna Temperature and G/T computed with AGTC_lite by F5FOD with DG7YBN


Mind that this antenna, data and analysis are numbers presented by UR5EAZ;
Contact Vladimir via
if you wish for more details.
73, Hartmut, DG7YBN
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