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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 7018w
4.0 m version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 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
 DL6WU Yagis
The DL6WU Longyagi Series
Sample plot: 32 el. plus 4 x reflector
Elevation Plot

....... 
Performance Data and Geometry
Pattern and VSWR
xpol
Stacking
Matching
GTV 7018w Yagi with bent Driven Element
Wideband version covering the full 70 cm band with nice G/T at EME & SSB part of band
This Yagi has very low back lobes for its length. It may serve as single antenna for portable
use and certainly make a useful 4 x vertical stack. It makes a quiet contest antenna due to its
high F/B. The bent DE (K6STI style) transforms from approx. 17 ohms to 50 ohms at feed point.
This Yagi is based on the GTV 218w design. Date of issuing this design: 22nd of Aug. 2021
Current distribution
3D Pattern
Performance Data
Specs: with 8 mm elements @ 432.1 MHz
Gain vs. isotr. Rad. 17.6 dBi
Gain vs. Dipole 15.4 dBD
3 dB Eplane 25.8 deg.
3 dB Hplane 26.8 deg.
F/B 33.5 dB
F/R 30.1 dB
Impedance 50 ohms
Mechan. Length 3969 mm incl. 2 x 40 mm stand off
Electr. Length 5.61 λ
VSWR Bandwidth 1:1.08 (as in VE7BQH Antenna Table)
Stacking dist. hpol.
toptobottom 1.51 m or 4.95 ft
sidebyside 1.57 m or 5.14 ft
How many OMs have been looking up this design?
Geometry
Ø8 mm Elements  On Boom  Dimensions (BC acc. DG7YBN)


Ele. 8.0 mm
DE 10 mm
Boom 20 x 20 mm

"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, 7arrays, HFKits.nl:
Includes an SBC of 1.14 mm
Ø8 mm Elements  On Boom  Dimensions (BC acc. DG7YBN)


Ele. 8.0 mm
DE 10 mm
Boom 25 x 25 mm

"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, 7arrays, HFKits.nl:
Includes an SBC of 1.14 mm
Table 2: GTV 7021n, 4 mm elements through boom:
"Ready to saw and drill" data for mounting elements through boom with BC according SM5BSZ's BC.exe:
Note: with through Boom BC it is important to stick to the boom end offsets given below!
Metric Boom 20 x 20 x 2 mm
Boom shape: square
Boom dim: 20 x 20 mm
Wall thickn.: 2.0 mm
Holes in boom: 6.0 mm
Offset rear: 40 mm
Offset front: 40 mm



Note: with through Boom BC it is important to stick to the boom end offsets given below!
Metric Boom 25 x 25 x 2 mm
Boom shape: square
Boom dim: 25 x 25 mm
Wall thickn.: 2.0 mm
Holes in boom: 6.0 mm
Offset rear: 40 mm
Offset front: 40 mm



Note: with through Boom BC it is important to stick to the boom end offsets given below!
Imperial Boom 1"
Boom shape: square
Boom dim: 1 x 1 inch
Wall thickn.: 1.6 mm
Holes in boom: 6.0 mm
Offset rear: 40 mm
Offset front: 40 mm



Note:
All the above include a "Segmentation Density Correction" (SBC) of 1.14 mm plus an offset of 0.70 mm per element = 1.84 mm
for compensation of the insulators (7arrays.com ) as shown above in combination with SM5BSZ'S BC.exe values.
Note: with through Boom BC it is important to stick to the boom end offsets given below!
Read abt. the SBC here .
For making of a 'Blade Dipole' which I recommend for elements through boom builds
Sketch of Bent Dipole
Radiation Pattern and VSWR Plots
Elevation and Azimuth plot at 432.1 MHz (8 mm ele.)
Elevation and Azimuth plot at 435 MHz (8 mm ele.)
Elevation and Azimuth plot at 439 MHz (8 mm ele.)
VSWR and Return Loss plots  simulated with 4nec2
Wide Return Loss plot of 4 mm version  simulated with 4nec2
This Yagi as XPOL 435 MHz Version
EZ/AZ Plot (4 mm ele.):
h/vplane offset = 680 mm,
Stacking per DL6WU h/v mean dist. = 1.54 m
This Yagi with 4 mm elements through a 25 x 25 mm boom
Metric Boom 25 x 25 x 2 mm
Boom shape: square
Boom dim: 25 x 25 mm
Wall thickn.: 2.0 mm
Holes in boom: 6.0 mm
Offset rear: 40 mm hplane,720 mm vplane
Offset front: 720 mm hplane, 40 mm vplane



Note: with through Boom BC it is important to stick to the boom end offsets given below!
Includes an SBC of 1.84 mm
Stacking
As on 432 MHz the Yfactor = T_earth / T_sky is so high, I see little chances to
improve an array's RX performance by using "Over Stacking" distances. However, depending on
the level of local QRM it might be worthwhile to try a decreased distance, especially in the Hplane.
Stacking Dist. DL6WU Formula
Hplane 1.51 m or 4.95 ft
Eplane 1.57 m or 5.14 ft
A 4 Yagi bay
Elev. Plot
Azim. Plot
4 bay data (8 mm ele.):
Gain vs. isotr. Rad. 23.5 dBi
Gain vs. Dipole 21.3 dBD
3 dB Hplane, appr. 5.8 deg.
3 dB Eplane, appr. 5.8 deg.
F/B 34.0 dB
F/R 30.1 dB
T_ant, total 61.8 K*
G/T 5.56 dB*
at Tsky = 27 K, Tearth = 1800 K as in newer VE7BQH Antenna Table
3D pattern plot with 4nec2's 3D viewer
Antenna G/T with AGTC lite VBAversion:
at Tsky = 27 K, Tearth = 1800 K as in newer VE7BQH Antenna Table
Symmetrising 50 to 50 ohms feedline to 432 MHz Bent DE
The principle is similar to the 1/4 Lambda coax. Adding 2 x 1/4 Lambda or a half wave line does not change anything but allows
to form a gentle bow below the boom or until behind the Reflector. Follow practical construction hints on "Building a Yagi" page.
Attenzione!
Take care when lengthening the coax, measure the actual electrical length instead of considering vfactors specified in a catalogue only.
A good choice may be the diam. 5 mm PTFE coax RG142 B/U: real resonate length (432.2 MHz as 3/4 Lambda) shieldshield is around 348 mm
Find more information on Phasing & Matching Lines page
73, Hartmut, DG7YBN

