Tower on which a visual and a radio target are mounted to check the electrical axis of an antenna.

Related Terms

PLASTIC BONDING

The joining of plastics by heat, solvents, adhesives, pressure, or radio frequency.

OUTPUT-METER ADAPTER

Device that can be slipped over the plate prong of the output tube 385 output-meter adapter output power of a radio receiver to provide a conventional terminal to which an output meter can be connected during alignment.

OUTPUT INDICATOR

A meter or other device that is connected to a radio receiver to indicate variations in output signal strength for alignment and other purposes, without indicating the exact value of output.

MIRROR INTERFEROMETER

An interferometer used in radio astronomy, in which the sea surface acts as a mirror to reflect radio waves up to a single antenna, where the reflected waves interfere with the waves arriving directly from the source.

LISTENING STATION

A radio or radar receiving station that is continuously manned for various purposes, such as for radio direction finding or for gaining information about enemy electronic devices.

INDUCTIVE COUPLER

A mutual inductance that provides electrical coupling between two circuits; used in radio equipment.

IDENTIFICATION FRIEND OR FOE

A system using pulsed radio transmissions to which equipment carried by friendly forces automatically responds, by emitting a pulse code, thereby identifying themselves from enemy forces; a method of determining the friendly or unfriendly character of aircraft, ships, and army units by other aircraft, ships, or ground force units. Abbreviated IFF.

HOWL

[ENG ACOUS] Undesirable prolonged sound produced by a radio receiver or audiofrequency amplifier system because of either electric or acoustic feedback.

HETERODYNE RECEPTION

Radio reception in which the incoming radio-frequency signal is combined with a locally generated rf signal of different frequency, followed by detection. the center of the exterior surface to permit tightening with a spanner.

GROUND ABSORPTION

The dissipation of energy in radio waves because of absorption by the ground over which the waves are transmitted.

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