-
• Main Page
- • Home
• Antennas - • 432 MHz
- YBN 70-5mA 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 70-14wzTune 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 70-2wA 0.14 m GTV useful for portable operation and up to the satellit band and handheld activities of any kind
Elevation Plot
- GTV 70-3wA 0.21 m GTV useful for portable operation and up to the satellit band and lower noise stacks of any kind
Elevation Plot
- GTV 70-4mA 0.34 m GTV useful for portable operation up to the satellit band and lower noise stacks of any kind
Elevation Plot
- GTV 70-7wA 0.96 m GTV useful for portable operation up to the satellit band and lower noise stacks of any kind
Elevation Plot
- GTV 70-7nA 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 70-8nA 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 70-9wA 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 70-11wA 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 70-14m2.9 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 70-17m3.7 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 70-19m4.2 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 70-21n4.7 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 70-23m5.3 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 70-25m5.9 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 70-30m7.3 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 70-34w8.5 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 70-46w12.0 m version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- YBN 70-5m
NEC Model Pattern Performance More Impressions
Super Moonbounce Array by DL7APV
128 x GTV 70-11w
Pattern in 3D Pattern, 4nec2's 3d viewer
Pattern in Cartesian Coordinates, 4nec2 & Gnuplot
Azimuth - real Array measured by DL7APV -17 ... 17 deg. - on Courtesy of DL7APV (tnx!)
Elevation - real Array measured by DL7APV -17 ... 17 deg. - on Courtesy of DL7APV (tnx!)
Overall Data
Specs: with 4 mm elements @ 432.1 MHz
Systems RXing ability
Own Echos
RX-line
Bill of Materials
How many OMs have been looking up this design?
The builder himself: Bernd, DL7APV
and his Site Supervisor
128 x GTV 70-11w
One of the largest ever built 70 cm band arrays. Area: 18.0 x 8.7 m or 59 x 28.5 ft.
128 Yagi-Uda GTV Antennas with Folded Dipole at a length of 2.81 λ phased by Open Feed Lines
128 Yagi-Uda GTV Antennas with Folded Dipole at a length of 2.81 λ phased by Open Feed Lines
Pattern in 3D Pattern, 4nec2's 3d viewer
Pattern in Cartesian Coordinates, 4nec2 & Gnuplot
Azimuth - real Array measured by DL7APV -17 ... 17 deg. - on Courtesy of DL7APV (tnx!)
Elevation - real Array measured by DL7APV -17 ... 17 deg. - on Courtesy of DL7APV (tnx!)
Performance
Overall Data
Specs: with 4 mm elements @ 432.1 MHz
Gain approx. 36 dBi Antenna G/T 20 dB (Tearth 458 K, Tsky 27 K) -3 dB E-plane less 2 deg. -3 dB H-plane approx. 4 deg. Size of Antenna Field Width 18.0 m Height 8.7 m |
Systems RXing ability
Sun Noise 21.6 dB at an sfi < 30 at 432 MHz Sagittarius A 7.3 dB Cassiopeia A 5.3 dB 260 W EIRP EME signal -25 dB in WSJT Pulsar B0329+54 easy detect within 200 sec sampling time |
Own Echos
Detection of own Echos
from 100 mW in WSJT
200 mW using CW
|
RX-line
Relay: HF2000 with DIN 7/16 LNA: DJ3FI Cavity-Preamp plus 2nd stage NF: 0.35 dB, Gain 42 dB |
Bill of Materials
Booms alone 384 m of 20 x 20 x 2 mm Weight 150 kg Elements 390 m of 4 mm aluminum rod Open Feed Lines 224 m of Cu-wire 4 mm Concrete Basement 10 tons Steel approx. 2400 kg of construction tubes and bearings |
How many OMs have been looking up this design?
The Making of the Array
The builder himself: Bernd, DL7APV
and his Site Supervisor
• 2008
It seems the starting point of this crazy scale project was when Bernd could get his hands on a pivot mount of a good size backhoe digger. Which with a diameter of 1.6 m and weighing 500 kg has just the right dimensions. In his presentation at the 2018 EME Conference he describes the buy as a "happy accident". Quite right Bernd!
• 2009
The foundation groundworks are taking place. His neighbors help with digger and lorry. The hole eats up 10 tons of concrete.
• 2010
The mighty pivots gearbox is overhauled and the horizontal lattice beam is made
• 2011
This year sees Bernd mounting the pivot to the foundation and erect the support construction taking the mid section of the horizontal lattice beam into a height of 5.5 m.
• 2012
Azimuth and elevation rotators are engineered, build and mounted. The outriggers to the horizontal lattice beam are mounted. After that the project seemed on halt as he mounted an array of 8 FM Yagis on the carrier only.
• 2015
However in this year Bernd was going strong again. Time to make a choice which antennas to engage for the job of 432 MHz EME. Focusing on Low Antenna Temperature, clean pattern and not critical VSWR when wet he picked the DG7YBN GTV 70-11w for a pretest.
• 2016
Bernd builds a 4 bay of GTV 70-11w with Open Feed Line and performs detailed testing to verify gain and pattern. He also mounts the 24 vertical carrier tubes to attach the 128 rear mounted Yagis to.
• 2017
Into mass production of the 128 Yagis now: 1792 holes for taking the elements, 1280 elements to be cut precisely, 2560 insulators to be pushed in (the first charge of 7arrays 4x6 mm insulators went into this project). 128 bent dipoles to be made from copper rod. Plus many a meter of open feed line. The first Yagis are being mounted.
• 2018
The feed lines are being completed and by April the array is ready for first tests. Which show a VSWR of 1:1.3 without any tuning and a sun noise of 20 dB straight away.
More details see DL7APV website
It seems the starting point of this crazy scale project was when Bernd could get his hands on a pivot mount of a good size backhoe digger. Which with a diameter of 1.6 m and weighing 500 kg has just the right dimensions. In his presentation at the 2018 EME Conference he describes the buy as a "happy accident". Quite right Bernd!
• 2009
The foundation groundworks are taking place. His neighbors help with digger and lorry. The hole eats up 10 tons of concrete.
• 2010
The mighty pivots gearbox is overhauled and the horizontal lattice beam is made
• 2011
This year sees Bernd mounting the pivot to the foundation and erect the support construction taking the mid section of the horizontal lattice beam into a height of 5.5 m.
• 2012
Azimuth and elevation rotators are engineered, build and mounted. The outriggers to the horizontal lattice beam are mounted. After that the project seemed on halt as he mounted an array of 8 FM Yagis on the carrier only.
• 2015
However in this year Bernd was going strong again. Time to make a choice which antennas to engage for the job of 432 MHz EME. Focusing on Low Antenna Temperature, clean pattern and not critical VSWR when wet he picked the DG7YBN GTV 70-11w for a pretest.
• 2016
Bernd builds a 4 bay of GTV 70-11w with Open Feed Line and performs detailed testing to verify gain and pattern. He also mounts the 24 vertical carrier tubes to attach the 128 rear mounted Yagis to.
• 2017
Into mass production of the 128 Yagis now: 1792 holes for taking the elements, 1280 elements to be cut precisely, 2560 insulators to be pushed in (the first charge of 7arrays 4x6 mm insulators went into this project). 128 bent dipoles to be made from copper rod. Plus many a meter of open feed line. The first Yagis are being mounted.
• 2018
The feed lines are being completed and by April the array is ready for first tests. Which show a VSWR of 1:1.3 without any tuning and a sun noise of 20 dB straight away.
More details see
DL7APV website
73, Hartmut, DG7YBN