ELECTRONIC COUNTER-COUNTERMEASURES (ECCM) CIRCUITSSee ANTIJAMMING
ELECTRONIC-EQUIPMENT DEHYDRATORA device that provides an alternate dry-air input in the
event of failure of the central dry-air system. It may include a compressor .
ELECTRONIC FREQUENCY COUNTERAn instrument that counts the number of cycles (pulses)
occurring during a precise time interval .
ELECTRONIC SCANNINGScanning in which the axis of the beam is moved, relative to the antenna
axis, in a desired pattern .
ELECTRONIC SWITCHA circuit that causes a start-and-stop switching action by electronic means
ELECTRONICS DRY-AIR BRANCHA common line for providing dry air to various electronic
equipment, such as search radar, fire-control radar, and repeaters .
ELECTRONIC TUNINGIn a reflex klystron, changing the frequency and output power of the tube by
altering the repeller voltage .
ELECTRON SPINThe movement of an electron around its axis .
ELECTROSTATICPertaining to electricity at rest, such as charges on an object (static electricity) .
ELECTROSTATIC DEFLECTIONThe method of deflecting an electron beam by passing it between
parallel charged plates mounted inside a cathode-ray tube .
ELECTROSTATIC FIELDThe field of influence between two differently charged bodies .
ELECTROSTATIC METER MOVEMENTA meter movement that uses the electrostatic repulsion of
two sets of charged plates (one fixed and the other movable). This meter movement reacts to voltage
rather than to current and is used to measure high voltage .
ELECTROSTATIC STRESSThe force exerted on an insulator by the voltage in a conductor .
ELEMENT(1) A substance, in chemistry, that cannot be divided into simpler substances by any means
ordinarily available . (2) A part of an antenna that can be either an active radiator or a parasitic
ELEPHANT TRUNKDucting used for ventilation purposes .
ELEVATION ANGLEThe angle between the horizontal plane and the line of sight to a target or object
EMERGENCY POWERTemporary source of limited electrical power used upon the loss of the normal
power source .
EMF (ELECTROMOTIVE FORCE)The force that causes electricity to flow between two points with
different electrical charges or when there is a difference of potential between the two points. The unit of
measurement is volts .
EMITTERThe element in a transistor that emits current carriers (electrons or holes)  .