A 3el 12.5/50 Ohm 50MHz Optimised Wideband Low impedance (OWL) Yagi

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 in the CONSTRUCTION menu above.

Do not look at the gain figure of this antenna and compare with other 6 element 50MHz Yagis. Compare the gain, F/B and bandwidth together against other antennas of a similar boom length. With 7.75dBi and a boom less than 1.3M long, this antenna will be a winner for field days and the rural Ham radio operator.

PLEASE NOTE:

• Special attention should be taken in ensuring the element spacing and sizes are absolutley correct upon a 12.5 Ohm Yagi
• If SWR is not perfect, D1 may also need to be adjusted. An analyser is reccomended for use when finalising 12.5 Ohm OWL Yagis
• 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 G0KSC insulators. Other insulators may require different correction, Email me for details
• A Folded dipole can be added in order to give this antenna a 50 Ohm feedpoint.

The 3el mini Yagi at G0KSC's 2010 summer holiday location, Cornwall UK

Performance UK/USA Version

Forward Gain:                           7.48dBi at 50.250MHz

Front to Back Ratio:                   25.57dBi at 50.250MHz

Peak Gain:                                 7.49dBi

Peak F/B:                                    25.88dB

Bandwidth:                               500KHZ below 1.2:1

Build Dimensions for UK/USA Version

Element           Spacing in metres  Half element Length in metres            Element Notes

Reflector               0                        1.5055                                  12.7mm 1/2 inch Diameter tube

DE                       .311                    1.403 (FD)                            12.7mm  1/2 inch Tube

D1                       1.200                  1.331                                   12.7mm 1/2 inch Diameter tube

Build Dimensions for European Version

Element           Spacing in metres Half element Length in metres            Element Notes

Reflector               0                       1.506                                       12mm Diameter tube

DE                       .311                   1.404 (FD)                                12mm Diameter tube

D1                      1.200                  1.332                                        12mm Diameter tube

NOTE: This antenna is fitted with a Folded dipole made form a G0KSC Stauff clamp either side of a 30/32mm square boom holding either 12mm or 1/2inch tube. The end sections are 10mm or 3/8 inch bent sections adjusted for best SWR.

Fantastic Azimuth plot of this 3el 50MHz OWL Yagi

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

SWR for this folded dipole fed OWL

Layout of this folded dipole OWL Yagi antenna