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- YBN 70-5m
A 0.5 m 432 MHz blue print of the YBN 2-5m 50 ohms
high F/B direct feed 144 MHz Low Noise Yagi 3D Plot
- YBN 70-8z
A 1.5 m high gain 28 ohms Yagi. A design partly based on the hardware of the WY-7010,
turning it into a 8 ele. 28 ohms Yagi with cleaner pattern, +1.8 dB gain and better VSWR. Azimuth Plot
- YBN 70-14wz
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 70-14+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 70-2w
A 0.14 m GTV useful for portable operation and up to the satellit band
and handheld activities of any kind Elevation Plot
- GTV 70-3w
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 70-4w
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 70-4m
A 0.34 m GTV useful for portable operation up to the satellit band
and lower noise stacks of any kind Elevation Plot
- GTV 70-7w
A 0.96 m GTV useful for portable operation up to the satellit band
and lower noise stacks of any kind Elevation Plot
- GTV 70-7n
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 70-8n
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 70-9w
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 70-10w
A 1.63 m GTV useful for portable operation up to the satellit band
and lower noise stacks of any kind Elevation Plot
- GTV 70-11w
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 70-13m
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 70-14m
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 70-17m
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 70-18w
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 70-19m
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 70-21n
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 70-23m
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 70-25m
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 70-30m
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 70-34w
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 70-46w
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
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Performance Data and Geometry
Pattern and VSWR
Download as File
Stacking < added now!
Matching
GTV 70-4w 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 70-4w 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 E-plane 60.0 deg.
-3 dB H-plane 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. h-pol. per DL6WU ... mind DL6WU formula is for approx. > 10 ele.
top-to-bottom 0.49 m or 1.6 ft ... suggestion YBN: 440 mm
side-by-side 0.69 m or 2.3 ft
Geometry
Ø8 mm Elements - On Boom - Dimensions (BC acc. DG7YBN)
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Ele. 8.0 mm
DE 10 mm
Boom 15 x 15 mm
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"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)
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Ele. 8.0 mm
DE 10 mm
Boom 20 x 20 mm
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"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)
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Ele. 10.0 mm
DE 10 mm
Boom 20 x 20 mm
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"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 430-440 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 70-4w are 'handmade', optimised using NEC.
For the GTV70-4w 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 GTV70-4w 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.
H-plane 0.-- m
E-plane 0.490 m / 440 mm
Elevation plot and data of 4 x vertical stack of GTV 70-4w Yagis at 440 mm each
Stacking Dist.
H-plane 0.-- m
E-plane 0.440 m
Elevation plot and data of 8 x vertical stack of GTV 70-4w 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 v-factors only.
A good choice may be the diam. 5 mm PTFE coax RG-142 B/U: real resonate length (432.2 Mhz as 3/4 Lambda) shield-shield is around 348 mm
Find more information on Phasing & Matching Lines page
73, Hartmut, DG7YBN
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