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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
Folded Dipole Version
Download as File
Stacking
Matching
GTV 7030m Yagi with bent Driven Element
EME + SSB band Longyagi
This Yagi has very low back lobes for its length. It may serve as single antenna for Tropo or make a nice 4 Yagi EME array.
It also 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.
GTV 7030m used by TD9CHR & TD9FYC Guatemala DXpedition
Image Source: TD9CHR & TD9FYC video, Chris, PA2CHR, 01.01.2019
Watch the DXpediton movie on Youtube
https://www.youtube.com/watch?v=xnxVaHpQ8_g
GTV 7030m Rope built by Marek, SP4ELF
Testing with help of Marcin SQ4CUC, Alexander RA2FGG and Romek SP4JCP in 10 C frost produced 2 QSOs in JT65.
Marek:"We have recovered many traces of EME stations but the conditions did not allow for longer work. We had
difficult weather conditions, frost 10 degrees and snowfall, clouds. Despite everything, the antenna worked
very well. Our equipment is FT857 and 200W we did not use LNA for technical reasons." Click for large photo
SubWebsite with more info on this rope Yagi
Close up on bent dipole: note symmetrising by Pawsay Stub
Cuttings from plastic tube for element fastening: (mind ... the shorter the better for best rf properties)
GTV 7030w Rope built by Thomas, M0ABA at MX0CNS
Look at this: A close to 8 m long GTV 7030m Rope Yagi built on Kevlar Kite lines,
4 mm elements and a 1/4 λ sleeve with Pawsey symmmetrising ...
Click here to see the full frame photo
There are details and all the news to be posted shortly about this antenna on the MX0CNS facebook
M0ABA at MX0CNS: Screenshot of WSJT of first QSO with the Rope Yagi, beam slightly off the moon still,
60 W at feed at MX0CNS <> DL7APV
GTV 7030m built by Chris, PA2CHR with 8 mm Elements on Boom, BC acc. DG7YBN
Current distribution
Short Screenshot Movie showing rotating 3D Pattern
To watch the rotating 3D Pattern movie by F5JM click here pse
Performance Data
Specs: with 4 mm elements @ 432.1 MHz
Gain vs. isotr. Rad. 19.7 dBi
Gain vs. Dipole 17.6 dBD
3 dB Eplane 20.6 deg.
3 dB Hplane 21.2 deg.
F/B 33.8 dB
F/R 33.8 dB
Impedance 50 ohms
Mechan. Length 7276 mm
Electr. Length 10.48 λ
Stacking Dist. hpol.
toptobottom 1.89 m
sidebyside 1.94 m
Geometry
Geometry for 4 mm elements
The Drivers diameter is 10 mm for all examples.
Use EZNEC's AutoSegmentation at 1050 MHz.
A simple symmetrising member may be made from a 3 x 1/4 Lambda line grounded at the far side with
Nflangebushing and an aluminium plate and ferrite added as close as possible to the DE, see below.
How many OMs have been looking up this design?
Geometry
Geometry for 4 mm elements
"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!
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
Offset rear: 40 mm
Offset front: 40 mm



Note:
This includes a "Segmentation Density Correction" (SBC) of 1.10 mm plus an offset of 0.70 mm per element = 1.80 mm
for compensation of the insulators (7arrays.com ) as shown above in combination with SM5BSZ'S BC.exe values.
Note: Other insulators will need other offset, with their length being probably the most important parameter for this.
Thus I advise to cut other plastic insulators to 7 mm each to match at least the length of the pilot insulators.
Note: with through Boom BC it is important to stick to the boom end offsets given below!
Read abt. the SBC here .
Using a large calliper gauge to control lenghts to the 10th of a millimeter is a must.
Ø8 mm Elements  On Boom  Dimensions (BC acc. DG7YBN)
Actual BC for on a 25 x 25 mm Boom with standard insulators is 11.0 mm, SBC is 1.37 mm (433.7  432.2 MHz),
total length to add is ~ 12.37 mm
Using a large calliper gauge to control lenghts to the 10th of a millimeter is a must.
Sketch of Bent Dipole
Pattern and VSWR Plots
Elevation and Azimuth plot at 432.1 MHz
SWR and Return Loss plots  simulated with 4nec2
GTV 7030 with Folded Dipole
The straight split bent dipole can be replaced with a bent folded dipole like in any nonbent Yagi design.
In doing so the transformation ratio of 1:4 remains. The bent folded dipole versions impedance is 200 ohms.
The folded dipole itself is of Ø 8 mm; I recommend an 'elements through boom' built.
So that the folded dipole is centered in the element plane for best symmetry in the elevation pattern.
For building with elements on boom see second sketch.
Geometry of the Folded Dipole
In the model we use the center of the tube, regardless of its actual diameter.
For builds ...
• ... with elements mounted through boom (Folded Dipole in element plane) use these dimensions
• ... with 8 mm elements mounted on 25 x 25 mm boom use these dimensions
Attention: Refl, DE, D1 shall be mounted on an inserted piece of 20x20 mm boom, D1 is modified.
D1 : Position: 156.5, length 311.5 + 7.5 mm of BC + 1.1 mm of SBC = D1 : 320.1 mm
Downloads
EZNEC file of this Yagi with 4 mm elements
Stacking
As on the 432 MHz Band the Yfactor = T_earth / T_sky is that high I see little chances in
bettering an array's RX performance by using "Over Stacking" distances. However, depending
the level of local QRM it might be worthwhile to try less distance, especially in Hplane.
Stacking Dist. DL6WU Formula
Hplane 1.89 m
Eplane 1.94 m
Elevation plot and data of 4 Yagi bay using DL6WU stacking distances
TANT screenshot of this Yagi with 4 mm elements
Gain vs. isotr. Rad. 25.54 dBi
Gain vs. Dipole 23.39 dBD
3 dB Hplane, appr. . deg.
3 dB Eplane, appr. . deg.
F/B . dB
F/R . dB
T_ant 29.3 K*
G/T 10.87 dB*
TANT screenshot of this Yagi with 8 mm elements
Gain vs. isotr. Rad. 25.59 dBi
Gain vs. Dipole 23.44 dBD
3 dB Hplane, appr. 10.0 deg.
3 dB Eplane, appr. 10.0 deg.
F/B 33.6 dB
F/R 32.8 dB
T_ant 26.0 K*
G/T 11.43 dB*
Theoretical numbers, no phasing line losses
nor imperfections caused by Hframe included
*) T_sky = 20 K, T_earth = 350 K as in VE7BQH G/T 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 right length instead of refering to given vfactors 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

