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A forward wave, beam-type microwave amplifier that uses crossed-field interaction to achieve good phase stability, high efficiency, high gain, and wide bandwidth for most of the microwave spectrum.



Related Terms

CROSSED-FIELD DEVICE

Any instrument crossed-needle meter which uses the motion of electrons in perpendicular electric and magnetic fields to generate microwave radiation, either as an amplifier or oscillator.

FIRST-ORDER LEVELING

Spirit leveling of high precision and accuracy in which lines are run first forward to the objective point and then backward to the starting point.

FREQUENCY COMPENSATION

The modification of the amplitude-frequency response of an amplifier to broaden the bandwidth or to make the response more nearly uniform over the existing bandwidth. Also known as frequency compensation.

TIDAL WAVE

  1. A wave caused by the gravitational interactions between the sun, moon and earth. Essentially, high water is the crest of a tidal wave and low water is the trough. Tide is the vertical component of the particulate motion and tidal current is the horizontal component. The observed tide and tidal current can be considered the result of the combination of several tidal waves, each of which may vary from nearly pure progressive to nearly pure standing and with differing periods, heights, phase relationships, and directions. 2. Any unusually high and destructive water level along a shore. It usually refers to either a storm surge or tsunami.

INSULATED-GATE BIPOLAR TRANSISTOR

A power semiconductor device that combines low forward voltage drop, gate-controlled turnoff, and high switching speed. It structurally resembles a vertically diffused MOSFET, featuring a double diffusion of a p-type region and an n-type region, but differs from the MOSFET in the use of a p substrate layer (in the case of an nchannel device) for the drain. The effect is to change the transistor into a bipolar device, as this p-type region injects holes into the n-type drift region. Abbreviated IGBT.

CUTOUT ANGLE

The phase angle at which a semiconductor diode ceases to conduct; it is slightly less than 180 because the diode requires some forward bias to conduct.

PHASE REDUCTION

Processing of observed high and low waters to obtain quantities depending upon the phase of the moon, such as the spring and neap ranges of tide. Formerly this process was known as SECOND REDUCTION. Also applicable to tidal currents.

DOUBLE-STREAM AMPLIFIER

Microwave traveling-wave amplifier in which amplification occurs through interaction of two electron beams having different average velocities.

BREAKOVER

In a silicon controlled rectifier or related device, a transition into forward conduction caused by the application of an excessively high anode voltage.

BRIDGING AMPLIFIER

Amplifier with an input impedance sufficiently high so that its input may be bridged across a circuit without substantially affecting the signal level of the circuit across which it is bridged.

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