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 YBN 705m
A 0.5 m 432 MHz blue print of the YBN 25m 50 ohms
high F/B direct feed 144 MHz Low Noise Yagi 3D Plot
 YBN 708z
A 1.5 m high gain 28 ohms Yagi. A design partly based on the hardware of the WY7010,
turning it into a 8 ele. 28 ohms Yagi with cleaner pattern, +1.8 dB gain and better VSWR. Azimuth Plot
 YBN 7014wz
Tune up your 19 ele. Tonna!A design based on the hardware of the F9FT,
turning it into a 14 ele. OWL with cleaner pattern, +0.3 dB gain and SWR less than 1.2 from 430 to 440 MHz Azimuth Plot
 YBN 7014+4w
A 3.2 m very wideband 50 ohms Yagi with reflector wall
that covers the whole 70 cm band with ease Elevation Plot
 GTV 702w
A 0.14 m GTV useful for portable operation and up to the satellit band
and handheld activities of any kind Elevation Plot
 GTV 703w
A 0.21 m GTV useful for portable operation and up to the satellit band
and lower noise stacks of any kind Elevation Plot
 GTV 704m
A 0.34 m GTV useful for portable operation up to the satellit band
and lower noise stacks of any kind Elevation Plot
 GTV 707w
A 0.96 m GTV useful for portable operation up to the satellit band
and lower noise stacks of any kind Elevation Plot
 GTV 707n
A 1.1 m 432 MHz blue print of the low impedance, yet 50 ohms
direct feed 144 MHz Low Noise Yagi introduced in Dubus 1/2013 Elevation Plot
 GTV 708n
A 1.3 m 432 MHz GTV with high gain but low backlobe volume. Makes
a very compact 4 Yagi bay for QRP EME or contesting.
Elevation Plot
 GTV 709w
A 1.44 m GTV ment to be useful as a vertical stack for contesting
or be an ideal small size portable Yagi Elevation Plot
 GTV 7010w
A 1.63 m GTV useful for portable operation up to the satellit band
and lower noise stacks of any kind Elevation Plot
 GTV 7011w
A 2.01 m GTV ment to be useful as a vertical stack for contesting
or be an ideal small size portable Yagi or minimum size EME 4 bay Elevation Plot
 GTV 7013m
A 2.5 m GTV ment to be useful as a vertical stack for contesting
or be an ideal small size portable Yagi or minimum size EME 4 bay Elevation Plot
 GTV 7014m
2.9 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 7017m
3.7 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 7019m
4.2 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 7021n
4.7 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 7023m
5.3 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 7025m
5.9 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 7030m
7.3 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 7034w
8.5 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 7046w
12.0 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
YBN 7014 plus 4 w Yagi with straight Driven Element
Wideband version ... 430 to 440 MHz
As a very wideband Yagi it has a 4 x reflector wall fitted to acheive very low back lobes across
430440 MHz. Simulated Return Loss (S11) is better 30 dB from 430 to 440 MHz. Due to length and whole
70 cm band coverage it may serve for anything from repeater to SSB band up to satellite operations.
Design date: Oct. 2020.
The Yagi is a 50 ohms direct feed design which of coarse also can be built with a common folded dipole.
The reflector wall follows DL6WU's way of increasing F/B on a wideband Longyagi. With this design I do
not intend to break any records regarding Antenna G/T or gain. This Yagi is intended an easy to reproduce,
always and anywhere on the band clean pattern design with a solid 16 dBi of gain.
Current distribution
3D Pattern (432.1 MHz)
Return Loss and VSWR (424  444 MHz)
Performance Data
Specs: with 8.00 mm elements @ 432.1 MHz
Gain vs. isotr. Rad. 16.0 dBi
Gain vs. Dipole 13.9 dBD
3 dB Eplane 31.8 deg.
3 dB Hplane 34.0 deg.
F/B 31.0 dB
F/R 27.4 dB
Impedance 50 ohms
Mechan. Length 3244 mm incl. 2 x 40 mm stand off
Electr. Length 4.56 λ
Stacking dist. hpol.
toptobottom 1.26 m or 4.13 ft
sidebyside 1.34 m or 4.40 ft
How many OMs have been looking up this design?
Geometry
Table 1: 70 cm section, 8.00 mm elements on a 20 x 20 mm boom:
"Ready to saw and drill" data for mounting elements on boom with BC according DG7YBN for standard insulators as sold by WiMo, Tino's Funkshop, HF Kits.nl, 7arrays:
Boom shape: square
Boom: 20 x 20 mm
Offset rear: 40 mm
Offset front: 40 mm



Note:
This includes an SBC of 1.28 mm
Note: This table starts with the DIPOLE!
Reflector Wall, also 40 mm offset at both ends.
The reflector wall is to be mounted at 40 mm minus height of insulators from rear end.
Table 2: 70 cm section, 5.00 mm elements on a 20 x 20 mm boom using hydraulic clamps (like Stauff) or SM7DTT insualtors:
"Ready to saw and drill" data for mounting elements on boom with BC according DG7YBN for using hydraulic clamps (like Stauff) or SM7DTT insulators:
Boom shape: square
Boom: 20 x 20 mm
Offset rear: 40 mm
Offset front: 40 mm



Note:
This includes an SBC of 1.28 mm
Note: This table starts with the DIPOLE!
Reflector Wall, also 40 mm offset at both ends.
The reflector wall is to be mounted at 40 mm minus height of insulators from rear end.
Radiation Pattern and VSWR Plots
Elevation and Azimuth plot at 432.1 MHz (8.0 mm ele.)
Elevation and Azimuth plot at 434.0 MHz
Elevation and Azimuth plot at 436.0 MHz
Elevation and Azimuth plot at 438.0 MHz
SWR and Return Loss plots  simulated with 4nec2
Downloads
none so far
Stacking
Stacking Dist. DL6WU Formula
Hplane 1.26 m
Eplane 1.34 m
2 x vertical YBN 7014 plus 4 w
Elevation Plot (432.1 MHz and 438 MHz)
4 x vertical YBN 7014 plus 4 w
Elevation and Azimuth Plot (432.1 MHz)
Data for elements 8.00 mm @ 432.1 MHz
Gain vs. isotr. Rad. 21.8 dBi
Gain vs. Dipole 19.7 dBD
F/B 29.8 dB
F/R 29.8 dB
T_ant 51.4 K*
G/T 4.77 dB*
Theoretical numbers, no phasing line losses
nor imperfections caused by mast included
*) T_sky = 27 K, T_earth = 1800 K as in newer VE7BQH G/T table
3D pattern plot with 4nec2's 3D viewer
Finally a G/Ta analysis with AGTC as MS Excel tool:
A 4 Yagi bay at DL6WU stacking distances v + h shows a corrected G/Ta of 4.77 dB at T:earth = 1800 K, T_sky = 27 K.
73, Hartmut, DG7YBN

