What is base loaded antenna?
A base load antenna has coil or load at the bottom of the antenna. Base load antennas usually have a three to four foot long whip made out of stainless steel. Base loaded antennas have a wave length of 1/4. A 1/4 wave antenna has an angle of radiation of 45 degrees.
What is top loading in antenna?
The objective of top loading is to increase the antenna’s electrical length to as close as possible a minimum of 90�. How it is done depends on the engineer and the desired effect. A combination of top-guy loading and use of a folded unipole antenna may present the best choice.
What is the function of a loading coil used as part of an HF mobile antenna?
What is the function of a loading coil used as part of an HF mobile antenna? The coil (inductor) is added to cancel out the capacitance already present in the circuit to try to achieve resonance.
How do loading coils work?
The coil is built to have an inductive reactance equal and opposite to the capacitive reactance of the short antenna, so the combination of reactances cancels. When so loaded the antenna presents a pure resistance to the transmission line, preventing energy from being reflected.
What is antenna loading?
[an′ten·ə ‚lōd·iŋ] (electronics) The amount of inductance or capacitance in series with an antenna, which determines the antenna’s electrical length. The practice of loading an antenna in order to increase its electrical length.
What is the use of loading coil in antenna?
A loading coil or load coil is an inductor that is inserted into an electronic circuit to increase its inductance. The term originated in the 19th century for inductors used to prevent signal distortion in long-distance telegraph transmission cables.
How does a coil antenna work?
Some antennas are made of loops of wire. These antennas detect the magnetic field rather than the electric field. Just as a magnetic field through a coil of wire is produced by the current in that coil, so too a current is induced in a coil of wire when a magnetic field goes through that coil.
How does an antenna loading coil work?
What does a loading coil do on an antenna?
What is a load coil telephone line?
A device placed into a telephone circuit between the end office and the subscriber to step up the voltage and compensate for signal loss due to bridged taps. The load coil is an inductive device that acts as a high-frequency choke and must be removed if the line is converted to high-speed digital use.