| 摘要 |
Improvements in transmitting-receiving antennas. They consist of the antenna mast being divided into an insulating part 1a and a metal part 1m. This presents a wide aperture 6 through which is visible the extension 8 of a rod 9 carrying a contact 10 which slides along the turns of a coil 11 such that by displacing it the resonance of the coil is varied. There is a connector 2 for coupling to the apparatus 3, such as a walkie-talkie; between this connector 2 and the supply 12 there is an electronic tuning system 4 with a LED 5 which when the resonance imparted to the coil 11 coincides with the frequency preestablished in the apparatus 3 it is at a maximum. It is planned that the contact be fixed and the coil mobile this latter having a core incorporated which slides within a sleeve constituting a variable capacitor. <IMAGE>
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