Telescopic Antenna

Telescopic Antenna

 

an antenna whose receiving or radiating elements, such as the arms of a dipole, are made in the form of an extensible system of metal tubes or rods of approximately equal length. Such a design facilitates changing the length of the antenna elements during tuning and permits the size of the antenna to be reduced when it is not in operation—for example, during transport or storage.

For each pair of telescoping tubes, the interior diameter of the outer tube is approximately equal to the exterior diameter of the inner tube. The tubes fit into one another with some friction, which is needed to provide electrical contact and to maintain the required length of each element of the telescopic antenna under operating conditions—that is, under the action of gravity or exposure to shaking or vibration. In some cases the required position of the tubes may be fixed by additional means. For example, collet chucks or springs may be employed.

Telescopic antennas are used principally in conjunction with radio receivers, radio transmitter-receivers, portable television receivers, and television receivers installed in moving objects, such as automotive vehicles; such antennas are also used as indoor television antennas.

V. K. PARAMONOV

Mentioned in ?
References in periodicals archive ?
Tenders invited for Ground plane antenna, wip antenna, ground mounted telescopic antenna and wall mounted telescopic antenna
Holding the device, a swiveling telescopic antenna mounted on a black plastic handgrip, the plainclothes guard walks by the side of the truck.
Anterior cranial fossa injury with telescopic antenna penetrating through the orbit with rhinorrhea and brain damage.
The use of Band III VHF for DAB/DAB+ requires the use of a telescopic antenna.
The small hand-held wand, with a telescopic antenna on a swivel, is being used at hundreds of check-points.
The many features include high sensitivity circuit, easy read dial scale, 2ft telescopic antenna for high FM/Air marine reception.
Other features include; headphone jack for private listening, TV / Radio / AV selection, Telescopic Antenna, External Antenna Input and all the normal controls.
95 that comes with modern features like a telescopic antenna and headphone jack.
The top-of-the-line CTP9900 is a black flip-style phone with 10-number memory, 10-channel selectability and replaceable flexible telescopic antenna.
For land-based applications, the Corvus II is shelter-mounted, incorporates a telescopic antenna array and can be used in vehicular or fixed-site applications.
5 mm headphone output, DC input, auxiliary input and a telescopic antenna for maximum range and reception.
Tenders are invited for Supply, Installation And Commissioning Of 18 Meter Pneumatic Telescopic Antenna Mast With Mounting Assembly To Be Mounted On Mobile Vehicle At Delhi