Canvey Island, Essex, England Justin@g0ksc.co.uk
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Twin boom quad
144MHz LFA Yagis
144MHz LFA Yagis

Low Noise LFA Yagis designed by G0KSC free to build for personal use.

144MHz LFA Yagis
70cms LFA Yagis
70cms LFA Yagis
Twin-Boom G0KSC Quads
G0KSC Twin-Boom Quads
Twin-Boom G0KSC Quads
G0KSC Custom Dish feeds - Above installation @ HB9Q
Custom low-noise dish feeds
Custom low-noise dish feeds
G0KSC Custom Dish Feeds

Above installation @ HB9Q

G0KSC Custom Dish feeds - Above installation @ HB9Q
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G0KSC SC0610M 10el 50Mhz OWA Yagi Antenna with a 15.2 Metre Length Boom

Please read the whole page, there are several versions of this antenna listed.

If you would like this antenna in different diameter or tapered elements contact me

This antenna has been redesigned and represents what i beleive to the the 'ideal boom length' for an OWA direct feed 50Ohm Yagi. This can be seen in the model in the super flat SWR, the high levels of F/B ratio along with the excellent gain and pattern.

The model below is designed with 12.7mm / 1/2 inch elements. There is also a 12mm element version below too. If you require a version of this antenna with another diameter wire, Email me and I will remodel. It is NOT POSSIBLE to simply resize the elements when using a different diameter wire and get the best performance possible. Element positions also need to change for the ideal antenna to be achieved again. Please read all the way down this page, there are other versions of this antenna using tapered elements too. As I have more requests, I will remodel in other element diameters and tapers and pulbish those too.

Enjoy the antenna and if you build, Please Send me photos!

Dimensions in Metres1/2 inch element version

Element spacing:

  • Ref =       0
  • Driven =  .772
  • D1 =       1.069
  • D2 =       2.183
  • D3 =       3.921
  • D4 =       5.946
  • D5 =       8.190
  • D6 =      10.594
  • D7 =      13.103
  • D8 =      15.200

Element sizes per element half:

  • Ref =       1.4735
  • Driven =   1.4585
  • D1 =        1.3915
  • D2 =        1.371
  • D3 =        1.342
  • D4 =        1.319
  • D5 =        1.2995
  • D6 =        1.279
  • D7 =        1.2605
  • D8 =        1.268

Performance figures @ 50.150Mhz:

  • Froward Gain: 14.67dBi free space
  • Front to Back: 28.06dB

Dimensions in Metres 12mm element version

Element spacing:

  • Ref =       0
  • Driven =  .772
  • D1 =       1.069
  • D2 =       2.183
  • D3 =       3.921
  • D4 =       5.946
  • D5 =       8.190
  • D6 =      10.594
  • D7 =      13.103
  • D8 =      15.200

Element sizes per element half:

  • Ref =       1.474
  • Driven =   1.4595
  • D1 =        1.3925
  • D2 =        1.3715
  • D3 =        1.3425
  • D4 =        1.3195
  • D5 =        1.300
  • D6 =        1.2795
  • D7 =        1.261
  • D8 =        1.2685

Performance figures @ 50.150Mhz:

  • Froward Gain: 14.64dBi free space
  • Front to Back: 29.08dB

The Azimuth plot of this fantastic 50 Ohm Split dipole antenna

The super-clean elevation plot

Elevation plot of this antenna 20m (66') above ground.

And finally the fantastic SWR curve - it does not get better than this on a 50Ohm Split dipole Yagi!

Element diameter:

Each element is made out of single piece 1/2 inch (12.7mm) aluminum tubing Each element half length needs to be doubled in order to gain your total element size.

NOTE:

You can build this antenna with 13mm diameter tubing using the same parameters above. Slightly higher front to back ratio and forward gain will be seen along with a narrower SWR curve. For other element diameters, please Email me.

For construction information see 'G0KSC insulators' and the UKSMG article from the main menu on the home page.

Justin G0KSC

 

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