The potential required to ionize the gas of a gas-filled tube. Sometimes called firing potential .
To make an atom or molecule of an element lose an electron, as by X-ray bombardment, and thus be converted into a positive ion. The free electron may attach itself to a neutral atom or molecule to form a negative ion .
The most important region of the atmosphere extending from 31 miles to 250 miles above sea level. Contains four cloud-like layers that affect radio waves .
Disturbances in the earth's magnetic field that make communications practical only at lower frequencies .
A metal plate with an opening through which electromagnetic waves may pass. Used as an impedance-matching device in waveguides .
The prevention of unwanted interaction or leakage between components .
A diagram showing the outline of a ship, aircraft, or equipment and the location of equipment and cable runs .
The radiation of energy equally in all directions .