A dipole antenna uses two conductors of the same length to detect radio waves and transmit the corresponding variable electrical current to a receiver. Each conductor represents one-quarter of a wavelength, and when combined, the dipole can detect a half-wavelength signal. The length of the two conductors determines the operational frequency.Know More
Dipole antenna conductors can be wires or metal rods, depending on the design. One conductor provides the feeder while the other provides a second signal path, balancing each of the one-quarter wavelengths. Some receivers use the feeder signal and ground the other signal, but many designs use a coaxial connection to feed both signals. With coaxial connections, an additional device called a balun helps balance both signals and reduce potential radio frequency noise. Dipole antenna designs range from simple two-wire units to complex folded dipoles mounted on a mast. Folded designs allow for longer conductor lengths without additional space and are typically used by professionals.
Before cable television, most households had some kind of dipole antenna. Early televisions used “rabbit ears,” a dipole antenna with telescoping conductors at an angle. Adjusting the length of the conductors and the corresponding angle usually produced a strong signal for some channels. Later televisions and radio receivers used the coaxial design, and most came with a balun as part of the packaging.Learn more about Audio Equipment
To build an AM radio antenna, use three wooden planks, a 22-American-gauge wire, insulated solid wire and a radio. Begin by building and wiring the frame, create the terminal, and then connect the antenna to your radio. The radio must have a terminal where stripped wire can be attached.Full Answer >
An FM radio antenna can be made at home by cutting lengths of 16-gauge insulated wire and connecting it to the FM radio or an audio amplifier. Some radio signals are very strong and will not require much of an antenna, but a larger antenna may be required to pick up weak radio signals.Full Answer >
Radio users can make their own homemade AM radio antennae by winding a coil out of single-strand wire, grounding the wire and putting a portable radio near the coil. Important supplies include single-strand wire, cardboard, tape and a wire stripper.Full Answer >
Make an FM dipole antenna at home using two 5-foot sections of antenna wire. Connect one section to one of the wires in the middle of the other section, strip a small section of insulation from each end, and tie the two wires in the top section together. The process takes just a few minutes.Full Answer >