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G0KSC SC0410L 10el 70Mhz Yagi
OWA Yagis

G0KSC SC0410L 10el 70Mhz Yagi

Gain
14.82 dBi
F/B
26.72 dB
Elements
10
Specifications

Performance

Gain
14.82 dBi
Front-to-back
26.72 dB
Elements
10
Dimensions

Element dimensions

Element dimensions (parsed from legacy body — check before publishing)

Element Position Note
Ref 0 mm parsed from legacy body — confirm position vs length
D2 1670 mm parsed from legacy body — confirm position vs length
D3 3024 mm parsed from legacy body — confirm position vs length
D4 4468 mm parsed from legacy body — confirm position vs length
D5 6081 mm parsed from legacy body — confirm position vs length
D6 7729 mm parsed from legacy body — confirm position vs length
D7 9460 mm parsed from legacy body — confirm position vs length
D8 10715 mm parsed from legacy body — confirm position vs length
Ref 1051 mm parsed from legacy body — confirm position vs length
Driven 1025 mm parsed from legacy body — confirm position vs length
Modelled performance

Plots

About this design

G0KSC SC04010L 10el 70Mhz  OWA Yagi Antenna with a 10.715 Metre Length Boom

This is a nice DX bean for 70Mhz. As always it has a nice flat SWR curve and is built with in a non-critical format so any small errors you make whilst constructing will not have a huge impact on performance.

I recommend this to be built from a 5 metre length of 1.25 inch box section aluminum with a 1 inch 5 metre length cut in to and slotted into each end.This should not need any support

Dimensions in Metres

Element spacing:

  • Ref =       0

  • Driven =  .558

  • D1 =       .79

  • D2 =      1.67

  • D3 =      3.024

  • D4 =      4.468

  • D5 =      6.081

  • D6 =      7.729

  • D7 =      9.46

  • D8 =      10.715

Element sizes per element half:

  • Ref =       1.051

  • Driven =   1.025

  • D1 =        .980

  • D2 =        .962

  • D3 =        .942

  • D4 =        .931

  • D5 =        .921

  • D6 =        .916

  • D7 =        .924

  • D8 =        .914

Performance figures @ 70.250Mhz:

  • Froward Gain: 14.82dBi free space

  • Front to Back: 26.72dB

  • Radiation angle at 10 Metres above ground: 10 degrees

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. No difference is length needs to be calculated for the 1inch or 1,1/4 inch boom as the elements sit high enough above the boom for the boom to have no influence.

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