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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 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
 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 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 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
Matching
GTV 707w Yagi with bent Driven Element
Wideband version ... 430 to 438 (440) MHz
This Yagi has very low back lobes for its length and bandwidth.
Simulated Return Loss (S11) is better 30 dB from 430 to 438 MHz. It may serve as single antenna for portable
use and is easy to repoduce. It certainly makes 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 designs origin is the YBN 3+7 SAT handheld combination Yagi.
With M0ABA having built it the first thing he did was a moon bounce test,
which went well with only 60 W at the feedpoint.
See building details and screenshots of the EME QSO on the SAT Yagis website
Current distribution
3D Pattern (432.1 MHz)
Performance Data
Specs: with 6.35 mm elements @ 432.1 MHz
Gain vs. isotr. Rad. 12.3 dBi
Gain vs. Dipole 10.1 dBD
3 dB Eplane 44.3 deg.
3 dB Hplane 52.2 deg.
F/B 26.5 dB
F/R 21.5 dB
Impedance 50 ohms
Mechan. Length 960 mm incl. 2 x 30 mm stand off
Electr. Length 1.30 λ
Stacking dist. hpol.
toptobottom 0.79 m or 2.59 ft
sidebyside 0.92 m or 3.02 ft
How many OMs have been looking up this design?
Geometry
Table 1: 70 cm section, 6.35 mm elements through a 5/8 inch boom,
formast mount with 280 mm offset on rear boom end:
"Ready to saw and drill" data for mounting elements through boom with BC according SM5BSZ's BC.exe:
This table is only valid for:
Boom shape: square
Boom dim: 5/8 x 5/8 inch
Wall thickn.: 1/6 inch = 1.6 mm
Holes in boom: 8.0 mm
Offset rear: 280 mm
Offset front: 30 mm



Note:
This does include an SBC of 1.74 mm plus a correction for the insulators (vfactor!) of 0.7 mm = 2.44 mm
Note: with through Boom BC it is important to stick to the boom end offsets given below!
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 (6.35 mm ele.)
SWR and Return Loss plots  simulated with 4nec2
M0ABA plotted Return Loss 70 cm: 44 dB at 435.5 MHz
Elevation Pattern 430  438 MHz
Downloads
none so far
Stacking
Stacking Dist. DL6WU Formula
Hplane 0.79 m
Eplane 0.96 m
A 4 Yagi bay
Elev. and Az. Plot @ 432.3 MHz
Data for elements 6.35 mm @ 432.3 MHz
Gain vs. isotr. Rad. 18.25 dBi
Gain vs. Dipole 16.10 dBD
3 dB Hplane, appr. 19.8 deg.
3 dB Eplane, appr. 23.2 deg.
F/B 29.4 dB
F/R 23.9 dB
T_ant 140.1 K*
G/T 3.21 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
4 x vertical Stack at 770 mm each
Elev. Pattern @ 432.3 MHz
8 x vertical Stack at 770 mm each
Elev. Pattern @ 432.3 MHz
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

