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A 8el 28 Ohm 144MHz Optimised Wideband Low impedance (OWL) Yagi Low Temperature Yagi

Revised  August 2014

Premium commercial versions of this antenna at Innovantennas

The OWL by G0KSC provides the benefits of both OWA (Optimised wideband Array) 50 Ohm antennas with those of traditional low impedance antennas. More information on the OWL can be found here

Visit HERE to learn how to make the OWL Match/Balun

Do not look at the gain figure of this antenna and compare with other 8 element 144MHz Yagis. Compare the gain, F/B and bandwidth together against other antennas of a similar boom length. With 14.04dBi (10mm element version) and a boom less than 4.3M long, this antenna will be a winner for field days and the rural Ham radio operator. Class leading G/T  and temperature figures too!

 

PLEASE NOTE:

 

 

Performance UK/USA Version

Forward Gain:                           14.04dBi at 144.300MHz

Front to Back Ratio:              23.51dBi at 144.300MHz

Peak Gain:                                 14.08dBi

Peak F/B:                                  25.27dB

Bandwidth:                               1.2MHz below 1.1:1

Sky Temp. TA:                          239.8 Kelvin

G/T:                                         -9.79dB

 

Four bay array (in metres)  - 2.8V x 3.050H

Sky Temp. TA:                         232.7 Kelvin

G/T:                                       -3.85dB

Gain:                                       19.82dBi

Note: all G/T and sky temperature figures at 144.100MHz

 

Build Dimensions for UK/USA Version

Element   Spacing in metres  Half element Length in metres   Element Notes

Reflector               0                                   .506                       3/8 inch tube

DE                       .365                               .484                       1/2 inch tube

D1                       .663                               .4715                     3/8 inch tube

D2                     1.233                               .4565                     3/8 inch tube

D3                     1.931                               .4475                     3/8 inch tube

D4                     2.718                               .440                       3/8 inch tube

D5                     3.587                               .4255                     3/8 inch tube

D6                     4.337                               .430                       3/8 inch tube

 

Build Dimensions for European Version

Element  Spacing in metres  Half element Length in metres   Element Notes

 

Reflector               0                                   .5055                   10mm tube

DE                       .365                               .485                     12mm tube

D1                       .663                               .471                     10mm tube

D2                     1.233                               .456                     10mm tube

D3                     1.931                               .447                     10mm tube

D4                     2.718                               .4395                   10mm tube

D5                     3.587                               .425                     10mm tube

D6                     4.337                               .430                     10mm tube

 

Antenna Plots

 

Fantastic Azimuth plot of this 8el 144MHz OWL Yagi

 

 

 

The Elevation plot is really clean too. A quiet antenna compared with most!

 

 

Ever seen a 28 Ohm antenna like this one before? Watch how many now appear on the Internet but remember where you saw them first!

 

The G0KSC OWL element layout.

As always, or if you have difficulty at all, please Email me!

 

Justin G0KSC