Dual Band Quads

21Mhz OWA Yagi Antennas

A 5el 28 Ohm 144MHz Optimised Wideband Low impedance (OWL) Low Temperature Yagi

Revised  February 2010

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

This is an ultra compact, high gain wide band 28Ohm Yagi which is ideal for all sorts of operation, including portable/field day. At only 1.34M long and producing over 10.4dBi this will be a popular home build antenna.

 

PLEASE NOTE:

  • Visit 'Making the OWL Match' for more information on the recommended matching methods
  • Please add 2mm to each element to allow for insulator correction if using insulators similar to G0KSC. If through boom/insulator/element bolts are used, add 3mm
  • This is a Low Temperature antenna, ideal for EME work

 

Performance UK/USA Version

Forward Gain:                           10.42dBi at 144.300MHz

Front to Back Ratio:                 25.12dBi at 144.300MHz

Peak Gain:                               10.47dBi

Peak F/B:                                25.41dB

Bandwidth:                              1.2MHz below 1.1:1

 

Build Dimensions for UK/USA Version

Element           Spacing in metres Half element Length in metres            Element Notes

Reflector               0                                   .517                                           3/8 inch tube

DE                       .184                               .502                                           1/2 inch tube

D1                       .338                               .479                                           3/8 inch tube

D2                       .840                               .460                                          3/8 inch tube

D3                     1.364                               .447                                           3/8 inch tube

 

Build Dimensions for European Version

Element           Spacing in metres Half element Length in metres            Element Notes

 

Reflector               0                                   .517                                            10mm tube

DE                       .184                               .503                                            12mm tube

D1                       .338                               .479                                            10mm tube

D2                       .840                               .460                                            10mm tube

D3                     1.364                               .447                                            10mm tube

 

Antenna Plots

Fantastic Azimuth plot of this low temperature 5el 144MHz 28Ohm OWL Yagi

 

 

The Elevation plot is really clean too. A super quiet antenna, find one the same size that is more quiet!

 

 

 

A Super quiet antenna that is wideband? Another first from G0KSC. Watch how many now appear on the Internet but remember where you saw them first!

 

The G0KSC OWL element layout. Note the close spacing of the first three elements. My 'secret' to wide band low impedance antennas I now release for all to use.

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

 

Justin G0KSC