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 YBN 22w
A 50 ohms direct feed 2 ele. Yagi with high potential
as broad beam Contest Stack. See yourself and compare to DJ9HO Double Quads and 7ZB Oblongs. Full details on 2 and 4 Yagi
stacks are given 3D Pattern of 4 x Stack
 YBN 25m (58)
1.6 m high F/R, good willing 50 ohms
direct feed Yagi as introduced with bent DE short version of the 58 in Dubus 4/2012 Elevation Plot
 YBN 28m (58)
3.6 m nice G/T, good willing 50 ohms
direct feed Yagi as introduced with bent DE expanded version of the 58 in Dubus 4/2012
Actually it seems to be so good that DK7ZB decided to use it as draft for the 8 ele. OWM he just published.
Elevation Plot
 YBN 210w (58)
5 m wide band, good willing 50 ohms
direct feed Yagi as introduced with straight DE expanded version of the 58 in Dubus 4/2012
Elevation Plot
 GTV 27n
3.1 m narrow band, max. G/T version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 28w
3.7 m wideband, still good G/T and nice F/B version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 28n
3.8 m narrow band, max. G/T version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 29n
4.3 m narrow band, balanced between low Antenna Temp. and G/T version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 YBN 210w 12.5 Ω
5.1 m  144.0 to 144.8 MHz wide band 12 ohms OWLstyle
Low Noise Yagi with straight DE and very low back lobes only Elevation Plot
 GTV 210LT
5.1 m moderate band width, lowest Antenna Temp. version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 GTV 211LT
6.0 m moderate band width, lowest Antenna Temp. version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot
 YBN 212w 12.5 Ω
6.8 m wide band 12 ohms OWLstyle
Low Noise Yagi with straight DE and very low back lobes only Azimuth Plot:
 GTV 212m mk2
Improved 6.8 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 212n
6.8 m narrow band version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot:
 GTV 214w
8.4 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 216w
10 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 219m
12.4 m version of the low impedance, yet 50 ohms
direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013 Elevation Plot

....... 
Performance Data and Geometry
Sketch of Boom
Pattern and VSWR
Download as File
Stacking
YBN 28m Yagi with Conventional Driver (Split or Folded Dipole)
This little Yagi has a high F/B, which makes it quite useful as a contest stack.
The 8 elem. YBN 28m version is the prolonged 5 ele. YBN 25m. It uses same Driver Cell elements and dipole.
Thus one can swap between various setups like 5 over 5 to 4 x 8 elem. or to 4 x 5 ele. vertically very easily.
Just as time, place and WX conditions demand. Read the full text in Dubus magazine issue 4/2012.
The YBN 210w is the final stage of expansion from YBN 25m > YBN 28m > YBN 210w with same Driver Cell
F4EZJ/p, Stef used 2 single and a 2 x vertical stack of YBN 28m's and along 4 x vertical 5 ele. LFA
in Championat de France THF 2016 contest: and finished "with 355 QSOs ... antennas doing excellent!!!"
Contest Station 7S7V from Malmö using 3 x vert. YBN 28m with WiMo Folded Dipole
in MMC 2016: Click on Images to enlarge
References please?
The 58 as 8 ele. seems to have become quite popular to reference other Yagis or serve as base for own design modifications.
We see DK7ZB modifying it to 28 ohms (8El.2mOWMYagi) by just changing elements in driver cell and G4CQM compare it to his CQM8C4 design.
Just keep in mind that I wanted the 58 to be a very uncritical conventional design and ever planed it to be part of the expandable 58 concept.
Which means that the 5 ele. can be expanded to this 8 ele. without modifications to the driver cell and reusing as many elements as possible
Hence it is limited to the needs of that concept, yet capable to be a serious player in the G/T table. The fact that other designers love to
refer to it shows its abilities.
Does this design perform?
YBN 28m, FT736R, 15 m RG213, 680 m ASL in SSB
Saturday afternoon in IARU VHF 2013, in nill cndx
IK1WVQ 769 km Troposcatter, across the
IK3UNA/P1 725 km Alps with 25 W only
G8T 626 km ... Avg. QRB 490 km, 15 QSOs


Performance Data
Elem. 4 mm Elem. 5 mm Elem. 8 mm
Gain vs. isotr. Rad. 13.0/13.1 dBi 13.1 dBi 13.1 dBi
Gain vs. Dipole 10.8/10.9 dBD 10.9 dBD 10.9 dBD
3 dB Hplane 42.0 deg. 41.8 deg. 41.8 deg.
3 dB Eplane 48.0 deg. 47.8 deg. 47.2 deg.
F/B 28.5 dB 29.4 dB 29.0 dB
F/R 19.9 dB 19.7 dB 19.8 dB
Impedance 50/200 ohms = =
Mechan. Length 3485 mm = =
Electr. Length 1.68 λ = =
Stacking Dist. hpol.
toptobottom 2.59 m
sidebyside 2.94 m
Geometry
INSULATED THROUGH BOOM THIN ELEMENTS (BC acc. 6WU)
Pos. 1/2 Length BC 20 mm BC 20 mm BC 25 mm BC 1"
in NEC = 2.2 = 2.2 = 3.4 = 3.5
Refl. 0 514.5 1033.2 1031.2 1032.4 10xx.x
DE 283 496.0 994.2 994.2 995.4 9xx.x
D1 403 480.0 966.2 962.2 963.4 9xx.x
D2 822 471.0 949.2 944.2 945.4 9xx.x
D3 1440 460.5 927.2 923.2 924.4 9xx.x
D4 2130 450.0 907.2 902.2 903.4 8xx.x
D5 2850 448.5 905.2 899.2 900.4 8xx.x
D6 3485 433.5 875.2 869.2 870.4 8xx.x
ele.5 mm ele. 4 mm ele. 5 mm ele. 5 mm ele. 1/4"
Use WiMo made spare Folded Dipole for their YU7EF line EF0208c
or selfmade one with modified D1 as follows:
Note: for elements 4 mm D1 is of differing length for 5 and 8 ele. Yagi when using a folded DE
ele. 4 mm, Pos. 403 mm NEC => 480.5, 20x20 => 963.2, 25x25 => 964.4 mm, 1"x1"=> 96x.x
ele. 5 mm, Pos. 402 mm NEC => 481.0, 20x20 => 964.2, 25x25 => 965.4 mm, 1"x1"=> 96x.x
ON BOOM ELEMENTS (standard ins.) SM7DTT ins.
Pos. 1/2 Length BC 20x20 BC 25x25 BC 1"x1" BC 20x20
in NEC = 3.9 = 7.6 = 7.9 = 3.0
Refl. 0 514.5 1032.9 1036.6 1034.9 1032.0
DE 283 496.0 995.9 999.6 999.9 990 Folded
D1 403 475.0 953.9 957.6 954.3 967.0
D2 822 466.0 935.9 939.6 935.9 945.0
D3 1440 454.5 912.9 916.6 912.9 924.0
D4 2130 443.0 889.9 893.6 889.9 903.0
D5 2850 439.0 881.9 885.6 881.9 900.0
D6 3485 423.8 851.5 855.2 851.5 870.0
ele. 8 mm ele. 8 mm ele. 8 mm ele. 3/8" ele. 5 mm
Element lengths corrected 20130326
Note: element lengths for Ø 8 mm fit 5/16" too
Use WiMo made Folded Dipole (spare from YU7EF line EF0208c)
or selfmade one with modified D1 as follows:
NEC => 477.0, 20x20 => 957.9, 25x25 => 961.6 mm, 1"x1"=> 961.9
Folded DE tiptotip = 990, inner height = 54, diam. = 10
                               
The Driver Dipoles diameter is 10 mm for all examples.
Use EZNEC's AutoSegmentation at 144.1 MHz for RL and SWR plots
Use EZNEC's AutoSegmentation at 350 MHz and correct elem. lengths
by 2.4 mm to produce radiation plots
Sketch of Folded Dipole
Here is a very helpful overview on the stages of the YBN 5 5 / 8 / 10 ele. project provided by Stef, F4EZJ
It shows what elements are shared and different at what positions on the boom for the various combinations
Note: Lengths given fit elements mounted on a 20 x 20 mm boom with 'standard insulators' and M3 screw
Sketch of Boom
F4EZJ, Stef, building a 4 Yagi Bay of YBN 28
→ Place mouse over images to enlarge



Four YBN 25 basic Yagis lined up ...


Four extended YBN 25 => YBN 28

Stef builds on 20 x 20 mm boom using 8 mm elements mounted semiinsulated
on boom with standard insulators and M3 screws



2 x YBN 28 and YBN 210


and YBN 210 with strut

External link to Stef's 'Onedrive' online album with many detailed photos
which includes an ingenious way of producing a split dipoles center part.
Well done and thank you Stef!
Pattern and VSWR Plots
Current distribution
Elevation and Azimuth plot at 144.1 MHz
RL and SWR plot  Version with Folded Dipole from WiMo EF0208c
miniVNA: 144.30 MHz, Z = 50.2 Ohm, SWR = 1.07, RL = 29 dB
Note: this plot is taken on a build without any post tuning on DE or D1.
Just the "OnBoomBC" added. Use additional Segmentation BC when starting
with the NEC models geometrie or simply take the geometry numbers given above.
Downloads
EZNEC file of this Yagi with Straight Split DE
Read more about building this Yagi in my Article "58 ... an extendable 144 MHz Yagi" in Dubus 4/12
Stacking
Stacking Dist. DL6WU Formula
Hplane 2.59 m
Eplane 2.94 m
Data of 8 over 8 Yagi stack using DL6WU stacking distances
Gain vs. isotr. Rad. 16.0 dBi
Gain vs. Dipole 13.9 dBD
F/B 33.1 dB
F/R 24.8 dB
T_ant 237,7 K*
G/T 7,75 dB*
Theoretical numbers, no phasing line losses
nor imperfections caused by Hframe included
Data of 4 Yagi bay using DL6WU stacking distances
Elevation plot
Gain vs. isotr. Rad. 19.0 dBi
Gain vs. Dipole 16.9 dBD
F/B 34.6 dB
F/R 19.7 dB
T_ant 238.8 K*
G/T 4.79 dB*
Theoretical numbers, no phasing line losses
nor imperfections caused by Hframe included
*) T_sky = 200 K, T_earth = 1000 K as in VE7BQH G/T table
73, Hartmut, DG7YBN

