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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
EME and SAT xpol
Stacking
Matching
GTV 7010w Yagi with bent Driven Element
From EME to SAT operation frequency up to 436 MHz with VSWR < 1:1.2
A Satellite version GTV 7010w SAT centered at 435,5 MHz is shown down the page.
For this design I put a bit of emphasis on good ability to make it an XPOL Yagi.
Which means a driver cell that is "open" enough to fit the second plane's elements
into but keep dipoles and D1 nicely separated per plane.
Hence this Yagi is suitable to make a nice Cross Yagi .
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.
Current distribution
3D Pattern
Performance Data
Specs: with 4 mm elements @ 432.1 MHz
Gain vs. isotr. Rad. 14.1 dBi
Gain vs. Dipole 11.9 dBD
3 dB Eplane 37.4 deg.
3 dB Hplane 41.4 deg.
F/B 28.6 dB
F/R 24.3 dB
Impedance 50 ohms
Mechan. Length 1632 mm incl. 2 x 40 mm stand off
Electr. Length 2.24 λ
Stacking dist. hpol.
toptobottom 0.98 m or 3.22 ft
sidebyside 1.08 m or 3.55 ft
How many OMs have been looking up this design?
Geometry
Bent Dipole: DE(a) is the inner straight length and pos. on boom, DE(b) is position of tips and span width when bent
The model uses EZNEC's AutoSegmentation at 1050 MHz.
The DE's is 10 mm for all examples.
Using a 'Blade Dipole' is recommended with elements through boom
A simple symmetrising section may be made from a 3 x 1/4 Lambda line grounded at the far end with
Nflangebushing and an aluminium plate and ferrite core added as close as possible to the DE,
see below.
Metric Ø4 mm Elements  Through Boom  Dimensions (BC acc. SM5BSZ's BC.exe)
"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!
Table 1: 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



Table 2: Metric Boom 20 x 20 x 2 mm, formast mount
Boom shape: square
Boom dim: 20 x 20 mm
Wall thickn.: 2.0 mm
Holes in boom: 6.0 mm
Offset rear: 300 mm
Offset front: 40 mm



Building hints:
For building hints see the GTV 7019
For fastening elements through boom
For making of a 'Blade Dipole' which I recommend for elements through boom builds
Radiation Pattern and VSWR Plots
Elevation and Azimuth plot at 432.1 MHz
VSWR and Return Loss (S11)
432  440
GTV 7010w XPOL
The xpol versions are planned with a large rear boom offset for adding a counterpoise
Radiation Pattern of SAT Version ... 435.5 MHz, Elevation and Azimuth Pattern
• GTV 7010w EME xpol: 432 MHz Version
EME xpol version: Antenna view in EZNEC
• Geometry:
"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: 25 x 25 mm
Wall thickn.: 2.0 mm
Holes in boom: 6.0 mm
hplane:
Offset rear: 720 mm
Offset front: 320 mm
vplane:
Offset rear: 1020 mm
Offset front: 40 mm



Note:
This does include an SBC of 1.28 mm plus a correction for the insulators (vfactor!) of 0.7 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!
vplane
hplane
• GTV 7010w SAT xpol: 435 MHz Version
SAT xpol version:
Offset between h and vplane s 280 mm.
VSWR Source1: hplane
VSWR Source2: vplane
Downloads
none so far
Stacking
Stacking Dist. DL6WU Formula
Hplane 0.981 m
Eplane 1.082 m
4 Yagi stack in H shape
Elevation plot and data of 4 Yagi bay using DL6WU stacking distances
Data for 4 mm el. and at 432.1 MHz
Gain vs. isotr. Rad. 19.99 dBi
Gain vs. Dipole 17.84 dBD
3 dB Hplane, appr. 18.6 deg.
3 dB Eplane, appr. 16.8 deg.
F/B 31.1 dB
F/R 27.6 dB
T_ant 111.0 K*
G/T 0.46 dB*
Theoretical numbers  these do not include phasing line losses
nor imperfections caused by Hframes or mast poles etc.
*) T_sky = 27 K, T_earth = 1800 K as in newer VE7BQH G/T table
Screenshot of AGTClite for this 4 Yagi stack
A vertical 4 Yagi stack
stacked at 970 mm: 19.9 dBi at a HPBW of 38 degr. on just 2.91 m of height on pole
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

