Almost finished!

By On · 2 Comments · In Amateur Radio

I have now installed elevated radials which need to be adjusted to bring the antenna to resonance at the correct frequency.

The antenna has a beautiful SWR curve centered on 1775 kHz as measured on my antenna analyzer.

I am able to use the antenna with low power at the low end of the band and I could not resist making a few contacts.

Initial comparison between my previous Top Band antenna – a Double L – on receive indicates that the new antenna outperforms the old transmit antenna by 15dB.

Tomorrow I will adjust the elevated radials and install them permanently.

Beautiful isn´t it?

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  • http://www.CQDX.ru Sparky

    Hi Thor,

    This “KING” antenna is a Vee-beam, or rhombic?
    Do you have a Map of your antenna property? Can you publish it?

  • http://tf4m.com Thor, TF4M

    The antenna is a design by TF3DX. Details may be published later, but in a nutshell the antenna may be fed in Common Mode as a “T” vertical against elevated radials OR it may be fed in Differential Mode as a resonant Dipole. In addition the antenna will be made to work on both 160 meters and 80 meters.
    On 80 meters especially, the feed will be at a high impedance which is the reason for the big insulators.
    The antenna will begin life as a vertical on 160 meters only – it´s primary function – other modes will be activated next summer when the weather is better.
    TF3DX is an electrical engineer/professor at the University of Iceland and he has been working on the design for two years. A month or so of number crunching CPU time has gone into modelling the antenna with EZNEC Pro5.

    One day I will have time to make a map of my antennas.

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