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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
Download as File
Stacking
Matching
GTV 7023m Yagi with bent Driven Element
EME + SSB band, with some loss usable for FM up to 435 MHz
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.
Date of issue of design: 2013.03.11
Current distribution
20150417: Nice photo of a GTV 7023 m over GTV 216w at SP8MRD on qrz.com
GTV 7023m built by Hannes, OE5JFL
Hannes managed to detect Pulsar B032954 on this single Longyagi!
For this he recalculated the design to 430 MHz and built it on a wooden lace and stand.
Photo & Image: on courtesy of Hannes, OE5JFL
Read more about this great acheivement on Hannes website
GTV 7023m built using 8 mm elements on 20 x 20 mm boom by John, G4ZTR
• Whats on the pole at G4ZTR? Lower Yagi is a CQM10DX for the 2m band, upper Yagi is a homemade 58 element DL6WU for the 23 cm band
Dipole details: center piece from PTFE, machined on a turning lathe by G4ZTR
VSWR Plot by G4ZTR
Photo and plot on courtesy of G4ZTR, tnx John
GTV 7023m built on single rope by Dennis, W5RZ
20170820: Battery run EME Station QSO W5RZ  NC1I with ~ 1.2 kW EIRP only
Dennis, W5RZ: "The equipment was a Yaesu FT817, Tokyo High power amplifier,
Signalink USB, and Bioenno 12 AH LiFeP04 battery. Output was 20 watts. ...
The entire station weighs less than 20 pounds, including the rig, battery,
antenna, picnic blanket, etc."
He used a lightweight coax (foam RG8X) from PA to the GTV 7023m's dipole.
The Yagi elements are not as aligned as can be due to the 'one rope' construction.
Which might cost 1 ... 2 dB. Nevertheless a QSO was completed. Which also attests
the GTV 7023m with 'Blade Dipole' to be a forgiving design.
Signal were 25 dB at NC1I / 25 dB at W5RZ
Frank, NC1I on HB9Q logger a few minutes after the QSO:
"Dennis that may be my most amazing 432 EME QSO in my 35 years of activity!"
And this is how the Picnic EME Station inclusive operator look like
All photos on courtesy of Dennis, W5RZ.  Tnx Dennis!
Tnx to Frank, NC1I for operating his Superstation for this as well.
NC1I 432MHz EME array, Photo on courtesy of Frank, NC1I, click to enlarge
Frank: "(The) Array is centered at 15 meter above ground and is about 12 meters wide,
7 meters high, and 3 meters deep (boom length). Gain is around 31.5 dBi and the antennas are K1FO design.
Link to panorama view and more photos on Franks array on GigaPan.com
GTV 7023m built on 20 x 20 mm boom by Rickus, ZS4A
Following the building samples given on my web closely he reports a VSWR of 1.2 mid band without any tuning done.
Note the boom to mast mounting plate as described here arranging the pole to be underneath the boom in a symmetrical way
Performance Data
Gain vs. isotr. Rad. 18.7 dBi
Gain vs. Dipole 16.5 dBD
3 dB Eplane 23.0 deg.
3 dB Hplane 23.6 deg.
F/B 34.9 dB
F/R 32.3 dB
Impedance 50 ohms
Mechan. Length 5240 mm
Electr. Length 7.55 λ
Stacking Dist. hpol.
toptobottom 1.70 m
sidebyside 1.76 m
Geometry
Geometry with 8 mm elements without any BC in EZNEC Wire Editor
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.
Building Tables
Ø 8.0 mm Elements  SemiInsulated on Boom  Dimensions (BC acc. DG7YBN)
"Ready to saw and drill" data for mounting elements on boom with standard insulators on 20 x 20 mm boom including a 30 mm offset from booms end:
Table revised 2018.09.13
Thin elements insulated through boom
Ø 3/16 inch (4.763 mm) Elements  Insulated 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!
This table is only valid for:
Boom shape: square
Boom dim: 20 x 20 mm
Wall thickn.: 1.5 mm
Holes in boom: 7.5 mm
Offset rear: 40 mm
Offset front: 40 mm
Note:
This does include a "Segmentation Density Correction" (SBC) of 1.98 mm.
Which does include a correction for the insulators, which is 0.7 mm as a fix offset.
Read abt. the SBC here .
Thin elements insulated through boom
Ø 4.0 mm Elements  Insulated 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:
This table is only valid for:
Boom shape: square
Boom dim: 20 x 20 mm
Wall thickn.: 1.5 mm
Holes in boom: 6.0 mm
Offset rear: 40 mm
Offset front: 40 mm



Note:
This does include an SBC of 1.98 mm plus a correction of 0.7 mm
for compensation of the insulators (7arrays.com ) as shown above in combination with SM5BSZ'S BC.exe values.
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
Downloads
EZNEC file of this Yagi with 4 mm elem.
EZNEC file of this Yagi with 8 mm elem.
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 1.70 m
Eplane 1.76 m
Elevation plot and data of 4 Yagi bay using DL6WU stacking distances
Gain vs. isotr. Rad. 24.51 dBi
Gain vs. Dipole 22.36dBD
3 dB Hplane, appr. 10.2 deg.
3 dB Eplane, appr. 10.5 deg.
F/B 32.6 dB
F/R 32.3 dB
T_ant 27.8 K*
G/T 10.08 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

