Investigation of the Propagation of Radio Interference in Ship Installations and of the Measures Necessary to Eliminate it,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The increased threat of radio interference on ships because of the ever increasing sensitivity of receiving equipment and the great number of onboard electric installations is discussed, including measures to eliminate interference. If interference levels rise above a stated maximum, attenuation measures have to be applied. The spread of interference has to be alleviated in the cables, in the coupling between the wirings, and the coupling between the wires and antennas. Walls and partitions on the ship provide additional damping because the various rooms constitute a type of insulating screen. Critical points are where interference-contaminated and interference-sensitive equipment are in the same room. The coupling of different-diameter wires results in impedance it is impossible to calculate accurately the extent of interference propagation. Measurements of existing installations can be usefully applied for specific coupling of onboard wire systems to decrease or eliminate the spread of interference. Specific examples are discussed, and it is concluded that a combination of improved coupling and proper filters can solve the problem of radio interference on ships.
- Radiofrequency Wave Propagation
- Radio Communications