G4CQM 50Ω Direct Feed Low Q Low Noise Yagis


All weather performance VHF/UHF/SHF yagi antenna designs...

  • Designed by Antenna Designer Derek Hilleard G4CQM, each yagi featuring fat chunky elements!
  • >>> Build Dimensions and yagi Stacking Distances can be found in the .nec files (these are simple text files and can be viewed in your web browser or text editor). Consider that when building a four yagi group the length and position of the driven elements will be somewhat different due to mutual coupling! Check each four yagi group .nec file to see recommended stacking distances! <<<
  • >>> NEED DIFFERENT ALUMINIUM TUBE DIAMETERS/SIZES? THEN CONTACT G4CQM AND I'LL TRY TO HELP YOU! <<<
  • Using the free and powerful 4nec2 by Arie Voors segmentation has been set at 25 segments per λ/2 for tuning purposes. Note that dimensions quoted are for free-space...
  • In the real world using Badland element clips for mounting the parasitics (reflector to final director) Boom Correction is required as follows:

    50 & 70MHz = 0mm
    144MHz = +6mm
    432MHz = +7mm

    Meanwhile Driven Element assumes PowAbeam DE moulding, no addition to length required in this case!

 

50MHz 6M Band
Design ID(Elements)(Ref - Final Dir [mm])
CQM67DX78540
6CQM8UXO87900
144MHz 2M Band
Design ID(Elements)(Ref - Final Dir [mm])
CQM6DX62400
CQM7DX72550
CQM8DXZ83696
CQM9DX93725
CQM9DXL94428
CQM10DX104890
CQM12DX126980
CQM13DX137980
CQM14DX148300
CQM14DXL148900
CQM16DX1610380
432MHz 70CM Band
Design ID(Elements)(Ref - Final Dir [mm])
CQM7016DX163220
CQM7018DX183900
CQM7022DX224900
1296MHz 23CM Band
Design ID(Elements)(Ref - Final Dir [mm])
SCQM70UC704778

 



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