DG7YBN / 144 MHz / YBN 2-9mz
  Last Update July 29th, 2024


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Performance Data and Geometry
Phasing
Pattern and VSWR
Download as File
Stacking
4 x vertical Phased Contest Stack


YBN 2-9mz  28 Ω Yagi with straight Driven Element



A 28 ohms, low noise Yagi derived from the well tested YBN 2-7mz.
Design focus was on clean rear, as single Yagi and also when errecting vertical stacks paired with insensitivity against weather influences or slightly bent elements and such.

Operation target was a rugged, simple to build an handle while going portable and extremely simple to phase antenna stacks.
There are two versions of this Yagi:

     • 'EME' version with a bit higher gain and max. G/Ta in noisy environments

     • 'Contest' version with cleaner rear and a bit less gain.

With 28 ohms at feedpoint this design is suitable for a straight forward phasing cables concept as shown by OK1NOR / DG7YBN in '144 MHz seamlessly phased 4 x 28 Ohms Low Noise Yagi Stack' in Dubus 1/2023. Using 75 ohms coaxes of odd multiples of 1/4 wl we get 4 x 200 ohms at the sum point, which results in 50 ohms total.
Design date of issue: 2024.07.21



YBN 2-9mz 3D pattern plot at 144,1 MHz




• 'EME' version: Performance Data

Specs: with 10 mm elements @ 144.1 MHz 

Gain vs. isotr. Rad.  13.85 dBi
Gain vs. Dipole       11.7 dBD
-3 dB E-plane         38.6 deg.
-3 dB H-plane         43.2 deg.
F/B                  -31.2 dB
F/R                  -25.4 dB
Impedance             28 ohms
VSWR Band Width       1.19:1 *
Mechan. Length        4300 mm plus 2 x 40 mm offset
Electr. Length        2.07 λ

Stacking Dist. h-pol. (144.1 MHz) at recommended 88 percent of distances per DL6WU formula
top-to-bottom         2.487 m or 8.2 ft
side-by-side          2.770 m or 9.1 ft

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


• 'Contest' version: Performance Data

Specs: with 10 mm elements @ 144.1 MHz 

Gain vs. isotr. Rad.  13.81 dBi
Gain vs. Dipole       11.7 dBD
-3 dB E-plane         38.8 deg.
-3 dB H-plane         43.4 deg.
F/B                  -32.2 dB
F/R                  -26.6 dB
Impedance             28 ohms
VSWR Band Width       1.15:1 *
Mechan. Length        4300 mm plus 2 x 40 mm offset
Electr. Length        2.07 λ

Stacking Dist. h-pol. (144.3 MHz)
top-to-bottom         2.826 m or 9.3 ft
side-by-side          3.147 m or 10.3 ft

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


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Geometry

• 'EME' version:

This Yagi with 10 mm elements on a 20 x 20 mm boom with standard insulators

Ele. 10.0 mm
DE 10.0 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:



This Yagi with 10 mm elements on a 25 x 25 mm boom with standard insulators

Ele. 10.0 mm
DE 10.0 mm
Boom 25 x 25 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:



• 'Contest' version:

This Yagi with 10 mm elements on a 20 x 20 mm boom with standard insulators

Ele. 10.0 mm
DE 10.0 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:



This Yagi with 10 mm elements on a 25 x 25 mm boom with standard insulators

Ele. 10.0 mm
DE 10.0 mm
Boom 25 x 25 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:











• 'EME' version: Pattern and VSWR Plots

Elevation and Azimuth plot at 144. MHz

 


Return Loss and SWR plots - simulated




• 'Contest' version: Pattern and VSWR Plots

Elevation and Azimuth plot at 144.1 MHz

 


Return Loss and SWR plots - simulated












Phasing




There are 75 ohms high quality, low loss coax cables available:
For instance
Italian company Messi & Paoloni:
• INTSAT 170 ELITE, 10 mm diameter
• INTSAT 220 ELITE, 13 mm diameter







Downloads

None so far.








Stacking


• 'EME' version 

Stacking Dist. at 88 percent of DL6WU Formula (144.1 MHz)
E-plane               2.770 m
H-plane               2.487 m

Elevation and Azimuth plot at 144. MHz

 

For Antenna G/T analysis see below ctest-version.


• 'Contest' version


Stacking Dist. at 100 percent of DL6WU Formula (144.3 MHz)
E-plane               3.147 m
H-plane               2.826 m

Plot and data of 2 vertically stacked YBN 2-9mz ctest using DL6WU stacking distances

Antenna View & Elevation Pattern


Plot and data of 4 vertically stacked YBN 2-9mz ctest using DL6WU stacking distances

Antenna View & Elevation Pattern


4 x vert. stack with lowest Yagi 9.0 m abover 'Perfect Ground'
F/B approx. -34 dB




• 'EME' version stacked at 88 percent of DL6WU distances in both h, v-plane: Antenna G/T:









73, Hartmut, DG7YBN



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