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On 05/30/2014 05:06 PM, David Joyce wrote:
> I would be grateful if one of you experts in radio matters could
> tell me whether one can add a couple of metres of good quality coax
> cable to distance the stub antenna of a hand held Icom transceiver
> from the radio, positioning the stub aerial on top of the fuselage
> behind the pilot, without mucking up its function.
Yes you can do that, provided you create some artificial ground at the
antenna connector (unless the airplane is made of metal). On the
radio, the radio itself plus the person holding the radio are some
kind of ground, but if you relocate the antenna you need something
below the antenna to take over that function. (If you don't, the outer
shield of the coax will take over that function, but this is probably
not what you want).
Note that the stub antenna of the hand held radio has less performance
than a full quarter wave antenna. (Inside this stub antenna you will
find a coil; it is still a quarter wave antenna but most of the length
has been coiled up and doesn't radiate as much anymore.)
Frans
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=/4la
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