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Receiver antenna

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  • Receiver antenna

    I have recently finished the Krick model of U-96 - but that's another story... Here in the UK the old 27MHz kit seems well suited to submarines, but I have a problem. My Tx/Rx combination has a reasonable range in free air, indeed many years ago I used it in my model sailplanes, but is down to about 10 metres now installed in U-96, on the surface; I dare not try diving as I fear it would be a one-way trip to the bottom. I have had a trawl of the internet, but have found next to nothing on the best arrangement for placing the Rx antenna. Given that this is only about a 1 metre length of wire there aren't many options, and I have simply trailed it as high as possible around the wtc.
    I would be interested in any observations and suggestions as to where I've gone wrong.

  • #2
    Is any portion of the antenna conductor shorting out to the water? Do you have the same limited range on land as in water -- that would be your big clue.

    Get back to us after you do the above checks.

    David
    "... well, that takes care of Jorgenson's theory!"

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    • #3
      Thanks for the response. I shall do some checking, wet and dry. I was assuming the kit was as before, and that installing in this boat was the culprit. I have never found any info as to the best and worst ways of dealing with the 'antenna' a.k.a. longish piece of wire. I suspect that the design of this model may have some effect; the receiver is in an ABS 'box', with a perspex cover. On top of this is more ABS for the flood tank, with grey paint, and then the outer hull - more ABS and grey metallic paint. I wonder if I have inadvertantly created a 'stealth' sub that absorbs RF?

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      • #4
        I think that grey Metallic paint can be a issue, the metal particals inside the paint can shield off the incoming signal ( think cage of faraday), as for your antenna, i always glue down the end when it is placed outside the WTC, so water can't enter into the cable, David mentioned this as shorting out to the water.

        Manfred.
        Fertig zum unterwasser.

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