RECEIVER(1) The object that responds to the wave or disturbance. Same as DETECTOR . (2)
Equipment that converts electromagnetic energy into a visible or an audible form . (3) In radar, a
unit that converts RF echoes to video and/or audio signals .
RECEIVER SENSITIVITY(1) The degree to which a receiver can usefully detect a weak signal. (2)
The lower limit of useful signal input to the receiver .
RECEIVER TRANSFER SWITCHBOARDEquipment used to transfer receiver audio outputs to
remote control station audio circuits .
RECEIVING ANTENNAThe device used to pick up the RF signal from space .
RECEIVING ENDSee OUTPUT END .
RECEPTIONThe instant when an electromagnetic wave passes through a receiver antenna and induces a
voltage in that antenna .
RECIPROCAL (OF A QUANTITY)The value obtained by dividing the number 1 by that quantity .
RECIPROCITYThe property of interchangeability of the same antenna for transmitting and receiving
RECOVERY TIMEIn a radar, the time interval between the end of the transmitted pulse and the time
when echo signals are no longer attenuated by the tr gap .
RECTIFIERA device used to convert ac to pulsating dc   .
RECTANGULAR-COORDINATE GRAPHA graph in which straight-line axes (horizontal and
vertical) are perpendicular .
REDThe reference color of equipment that passes classified information. It normally refers to patch
REFERENCE LINEThe position of zero displacement in a wave .
REFERENCE POINTA point in a circuit to which all other points in the circuit are compared .
REFLECTED WAVE(1) The wave that reflects back from a medium. (2) The wave moving back to the
source from the termination of a transmission line after reflection has occurred .
REFLECTING OBJECTIn radar a air or surface contact that provides an echo .
REFLECTION WAVESWaves that are neither transmitted nor absorbed, but are reflected from the
surface of the medium they encounter .
REFLECTORThe parasitic element of an array that causes maximum energy radiation in a direction
toward the driven element .
REFLEX KLYSTRONA klystron with a reflector (repeller) electrode in the place of a second resonant
cavity used to redirect the velocity-modulated electrons back through the cavity that produced the
modulation . (2) A microwave oscillator that is tuned by changing the repealer voltage .
REFRACTIONThe changing of direction of a wave as it leaves one medium and enters another medium
of a different density  .