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    Antennas - Underwater

    david f
    david f
    AMS Treasurer


    Posts : 2276
    Join date : 2010-11-10
    Age : 72
    Location : Cumbria

    Antennas - Underwater Empty Antennas - Underwater

    Post  david f Mon Oct 17, 2022 3:21 pm

    I have been having some wide-ranging discussions with Rob S from Holland about 27MHz but also underwater antennas. He has been very helpful and recommended this paper (Google this phrase and you can download the whole paper):

    Antenna Design for Underwater Applications by Oluyomi Aboderin

    It is a long and often technically complex paper but he recommends Chapter 2.5 for a good historical review and the section starting on page 111 gives details of antenna mounted on the outside of the hull or WTC.

    The diagram on Page 111 shows the general idea - a dipole mounted on the outside and insulated from water by a thin covering.

    You may wonder what the advantages may be? Well space saving is one. Also the antenna can be much shorter (i think he said 1/10 of the length in air.) This would have particular advantages for 27MHz.

    We need to do some practical experiments to see how these work out - not too difficult to build, I think.

    Rob recommends dipoles.

    David
    M7DYP

      Current date/time is Mon Dec 05, 2022 11:44 pm