Canvey Island, Essex, England Justin@g0ksc.co.uk
VM - Featured products
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 SC0608L 8el 50Mhz Yagi Antenna with a 9.8 Metre Length Boom

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 and also a 12mm element version below. 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 VERY 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.

2 x 8el G0KSC OWA installed at BA4SI

 

MM0GPZ built the 8 element 6M G0KSC OWA Yagi form the RSGB 2009 Field Day

Dimensions in Metres - all tubing 1/2 inch or 13mm diameter, mail for other sizes and tapered elements

Element spacing:

  • Ref =      0
  • Driven =  .666
  • D1 =       .949
  • D2 =       2.082
  • D3 =      3.790
  • D4 =      5.713
  • D5 =      7.909
  • D6 =      9.800

Element sizes per element half:

  • Ref =       1.481
  • Driven =   1.4535
  • D1 =        1.387
  • D2 =        1.3685
  • D3 =        1.3395
  • D4 =        1.3235
  • D5 =        1.302
  • D6 =        1.2765

Performance figures @ 50.150Mhz:

  • Froward Gain: 13.23dBi free space
  • Front to Back: 23.46dB

Dimensions in Metres - all tubing 12mm

Element spacing:

  • Ref =      0
  • Driven =  .666
  • D1 =       .949
  • D2 =       2.082
  • D3 =      3.790
  • D4 =      5.713
  • D5 =      7.909
  • D6 =      9.800

Element sizes per element half:

  • Ref =       1.482
  • Driven =   1.4545
  • D1 =        1.388
  • D2 =        1.3695
  • D3 =        1.3405
  • D4 =        1.3245
  • D5 =        1.303
  • D6 =        1.2775

Performance figures @ 50.150Mhz:

  • Froward Gain: 13.22dBi free space
  • Front to Back: 23.73dB

Azimuth Plot

Elevation Plot

This fantastic antenna at 20m up

An Excellent SWR to go with the fantastic pattern!

 

Remeber, mail me if you have different diameter tube requirements and send photos of built antenna!