DG7YBN / 144 MHz / YBN 2-7m
  Last Update Oct. 11th, 2020




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Performance Data and Geometry
Pattern and VSWR
FM Version with Folded Dipole
Download as File
Stacking


YBN 2-7m  Yagi with straight Driven Element



Another variation of the well tested 5-8 series. Focussing on a high F/B with good gain here is one more specimen that can be transformed in to respectively from any YBN 2-5m, 2-8m or 2-10m thanks to same positions of Reflector, Dipole, D1, D2 and mostly same element lengths. Note the shape of the suitable folded dipole is same for the whole line including the FM version of the 2-7m. Design date of issue: 2020.10.11




YBN 2-7m 3D pattern plot at 144,1 MHz




Performance Data

Specs: with 8 mm elements @ 144.1 MHz

Gain vs. isotr. Rad.  12.2 dBi
Gain vs. Dipole       10.1 dBD
-3 dB E-plane         45.4 deg.
-3 dB H-plane         53.4 deg.
F/B                  -25.5 dB
F/R                  -20.9 dB
Impedance               50 ohms
VSWR Band Width       1.12:1 *
Mechan. Length        2720 mm
Electr. Length        1.31 λ

Stacking Dist. h-pol. (144.1 MHz)
top-to-bottom         2.32 m or 7.6 ft
side-by-side          2.70 m or 8.8 ft

*) as in VE7BQH G/T table = at 145.00 MHz


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Geometry



This Yagi with 8 mm elements on a 20 x 20 mm boom with standard insulators

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:



The Drivers diameter is 10 mm for all examples.
The EZNEC model is done with Auto-Segmentation at 144 MHz




Sketch of Folded Dipole









Pattern and VSWR Plots

Elevation and Azimuth plot at 144.1 MHz

 


RL and SWR plots - simulated










145.5 MHz FM Version

• with Folded Dipole





• This Yagi with 5 mm elements on a 20 x 20 mm boom with SM7DTT insulators or Stauff clamps

Ele. 5.0 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 higher insulators
such as SM7DTT holders and Stauff hydraulic clamps:




• This Yagi with 8 mm elements on a 20 x 20 mm boom with SM7DTT insulators or Stauff clamps

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 higher insulators
such as SM7DTT holders and Stauff hydraulic clamps:



Note the D1 position and length are preliminary. These are subject to trimming


The Drivers diameter is 10 mm for all examples.
Use Folded Dipole with same dimensions as in sketch above.
The EZNEC model is done with Auto-Segmentation at 144 MHz



Elevation Plot 8 mm el. ... (5 mm el. Gain: 12.33 dBi, F/B: 26.4 dB)


Azimuth Plot with offset between folded dipole center and element plane = 22 mm


RL and SWR plots - simulated










Downloads

None so far.









Stacking


Stacking Dist.    DL6WU Formula (144.1 MHz)
E-plane               2.74 m or 9.0 ft
H-plane               2.34 m or 7.7 ft


Plot and data of 2 vertically stacked YBN 2-7m using DL6WU stacking distances

Antenna View & Elevation Pattern


Plot and data of 3 vertically stacked YBN 2-7m using DL6WU stacking distances

Antenna View & Elevation Pattern


Plot and data of 4 vertically stacked YBN 2-7m using DL6WU stacking distances

Antenna View & Elevation Pattern


4 x vert. stack with lowest Yagi 4.0 m abover 'Perfect Ground'
F/B approx. -34 dB



Plot and data of 6 vertically stacked YBN 2-7m using DL6WU stacking distances

Antenna View & Elevation Pattern


6 x vert. stack with lowest Yagi 3.0 m abover 'Perfect Ground'
F/B approx. -35 dB



Plot and data of 4 in H-config stacked YBN 2-7m using DL6WU stacking distances

Elevation & Azimuth Pattern

 










73, Hartmut, DG7YBN



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