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  4. Posted

    Hentenna 2,1 GHz

    The original Hentenna as a special kind of a single loop was described first in the 1970ies by Japanese Hams, an English article by JF6DEA/KE1EO about the Antenna ("The Hentenna – The Japanese 'Miracle' Wire")  was in the QST 1982 and in the ARRL-Antenna- Compendium, Vol. 5. The basic function of the  Hentenna structure is the 1,50-λ-Extended-Quad. This antenna with the figure of an "Oblong" has a gain of 3,6 dBd, but a feedpoint impedance of 73 + j 470 Ω.

    The Hentenna has nearly the same gain, but a clever feeding with an impedance at XX of 50-70  +/- j 0 Ω .

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    https://www.qsl.net/dk7zb/Quadlong/Hentenna.htm

  16. Posted

    Picture series shows the teardown of this antenna.  This particular version has separate 7/16 connectors for connection to the horizontally and vertically polarised antenna.  Construction is very solid Deutsche GrÜndlichkeit: stainless steel bolts, silvered connectors, tons of pop rivets to obtain a very rigid construction etc.  The Kathrein catalog promises 15 years of maintenance free operation.   As can be seen extensive lengths of semi-rigid, or more exact Huber & Suhner Sucoform 141.  The cables are connected via soldered-on 'junction boxes'.  The white blocks are plastic spacers.
     

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