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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 704w
A 0.33 m wideband GTV useful for portable operation 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 < added now!
Matching
GTV 704w Yagi with bent Driven Element
From SSB band up to 440 MHz, clean rear pattern version.
This little Yagi has a very high F/B, which makes it quite useful as a contest stack.
The bent DE (K6STI style) transforms from approx. 17 ohms to 50 ohms at feed point.
Date of issuing this design: 26th of Feb. 2022.
Current Distribution & 3D pattern
GTV 704w built by Bent, LA0GE
This website has been viewed by how many 70 cm enthusiasts since Feb. 2022?
Performance Data
Elem. 10 mm
Gain vs. isotr. Rad. 9.0 dBi
Gain vs. Dipole 6.8 dBD
3 dB Eplane 60.0 deg.
3 dB Hplane 89.8 deg.
F/B 27.6 dB
F/R 23.9 dB
Impedance 50 ohms
Mechan. Length 332 mm plus boom offsets
Electr. Length 0.48 λ
Stacking Dist. hpol. per DL6WU ... mind DL6WU formula is for approx. > 10 ele.
toptobottom 0.49 m or 1.6 ft ... suggestion YBN: 440 mm
sidebyside 0.69 m or 2.3 ft
Geometry
Ø8 mm Elements  On Boom  Dimensions (BC acc. DG7YBN)


Ele. 8.0 mm
DE 10 mm
Boom 15 x 15 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, HF Kits.nl, 7arrays:
Includes an SBC of 1.37 mm ... (434,0  432,5) MHz.
Other element diameters and boom sizes on request ...
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, HF Kits.nl, 7arrays:
Includes an SBC of 1.37 mm ... (434,0  432,5) MHz.
Other element diameters and boom sizes on request ...
Ø10 mm Elements  On Boom  Dimensions (BC acc. DG7YBN)


Ele. 10.0 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, HF Kits.nl, 7arrays:
Includes an SBC of 1.37 mm ... (434,0  432,5) MHz.
Other element diameters and boom sizes on request ...
Sketch of Bent Dipole
Pattern and VSWR Plots
Elevation and Azimuth plot at 432.1 MHz
RL and SWR plot: S11 = Return Loss: 35 dB across 430440 MHz
Elevation and Azimuth plot at 438.0 MHz
Downloads
None so far.
Stacking
• For Yagis of a length less approximately 2 wL the DL6WU formula does not deliver best performance.
Hence the stacking distances for the GTV 704w are 'handmade', optimised using NEC.
For the GTV704w Yagis I suggest a vertical stacking distance of 440 mm.
• For very small Yagis the optimum stacking distances are that low, that mutual coupling between
the individual Yagis becomes a serious effect. Which spoils the VSWR. So that either an adaption of the Yagis
must take place or we just live with less Return Loss if practicable.
Elevation plot and data of 2 x vertical stack of GTV704w Yagis
Yaigs not modified. VSWR < 1.15 for 430  440 MHz, at 490 mm
Yaigs not modified. VSWR < 1.15 for 430  440 MHz, at 440 mm
Stacking Dist.
Hplane 0. m
Eplane 0.490 m / 440 mm
Elevation plot and data of 4 x vertical stack of GTV 704w Yagis at 440 mm each
Stacking Dist.
Hplane 0. m
Eplane 0.440 m
Elevation plot and data of 8 x vertical stack of GTV 704w Yagis at 440 mm each
Stacked over perfect ground,lowest Yagi at 4.0m agl.
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

