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 SC0605SM 5el 50Mhz Yagi Antenna with a 3.563 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 and also 12mm elements. 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 in my opinion, I remodel the whole antenna each time. 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.

 

Built by WA4ZTY

The SC0605M at KF6A

'The SWR curve is where I want it to be with NO tweaking of the driven element....'

' BTW, it rained hard for 3 hours straight today and my SWR didn't flinch...'
- 'KF6A

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

Element spacing:

  • Ref =      0
  • Driven =  .524
  • D1 =       .787
  • D2 =       2.128
  • D3 =      3.563

Element sizes per element half:

  • Ref =       1.488
  • Driven =   1.469
  • D1 =        1.390
  • D2 =        1.361
  • D3 =        1.318

Performance figures @ 50.150Mhz:

  • Froward Gain: 10.15dBi free space
  • Front to Back: 23.60dB
  • 1:1.2 SWR B/W 500Khz

Dimensions in Metres - all tubing 12mm diameter, mail for other sizes and tapered elements

Element spacing:

  • Ref =      0
  • Driven =  .524
  • D1 =       .787
  • D2 =       2.128
  • D3 =      3.563

Element sizes per element half:

  • Ref =       1.489
  • Driven =   1.470
  • D1 =        1.391
  • D2 =        1.362
  • D3 =        1.319

Performance figures @ 50.150Mhz:

  • Froward Gain: 10.14dBi free space
  • Front to Back: 23.39dB
  • 1:1.2 SWR B/W 500Khz

 

Azimuth Plot

Elevation Plot

This fantastic antenna at 10m 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!

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