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FREQUENCY MODULATOR [6 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2003-09-05

English

Subject field(s)
  • Electronic Devices
  • Telecommunications Transmission
CONT

The sub-modulator is transformer-coupled to the modulator comprising two valves M. A. 12/15000, which is also transformer-coupled to the anode-lead of the fifth H. F. [high frequency] stage, thus providing anode modulation in the H. F. power-amplifier stage.

French

Domaine(s)
  • Dispositifs électroniques
  • Transmission (Télécommunications)

Spanish

Campo(s) temático(s)
  • Dispositivos electrónicos
  • Transmisión (Telecomunicaciones)
DEF

Amplificador de baja frecuencia que precede inmediatamente al modulador en un transmisor.

Save record 1

Record 2 2003-07-21

English

Subject field(s)
  • Satellite Telecommunications
  • Radio Waves
CONT

... the backward wave amplifier is a voltage tuned amplifier and the modulator voltage applied to it must be varied with frequency.

French

Domaine(s)
  • Télécommunications par satellite
  • Ondes radioélectriques
Key term(s)
  • amplificateur à ondes régressives
  • amplificateur à ondes inverses

Spanish

Save record 2

Record 3 2002-05-22

English

Subject field(s)
  • Telecommunications Facilities
DEF

A modulator which varies the frequency of a carrier according to the information-bearing parameter of the modulating signal, generally its amplitude, thus producing a frequency-modulated wave of constant amplitude.

French

Domaine(s)
  • Installations de télécommunications

Spanish

Campo(s) temático(s)
  • Instalaciones de telecomunicaciones
DEF

Modulador que varía la frecuencia de una portadora de acuerdo con el parámetro portador de información de la señal moduladora, generalmente su amplitud, produciendo de este modo una de frecuencia modulada de amplitud constante.

Save record 3

Record 4 1998-12-14

English

Subject field(s)
  • Lasers and Masers
  • Photoelectricity and Electron Optics
  • Optical Telecommunications
CONT

Both radio broadcasting and fiber optic systems require three essential elements : a transmitter, a transmission medium and a receiver. Instead of a radio wave transmitter and modulator to set the broadcast frequency and power the signal through the air, optical systems use modulators to establish an optical frequency, or channel, on a laser beam and feed it through a fiber. An optical frequency receiver then collects the messages, much in the manner of a radio set. And, just as tunable radio receivers let listeners select from among a number of stations, a tunable receiver for fiber optic communication is highly desirable.

PHR

Quasi-optical frequency.

French

Domaine(s)
  • Masers et lasers
  • Photo-électricité et optique électronique
  • Télécommunications optiques
CONT

Les études actuelles concernent la modélisation et la caractérisation de composants ou de fonctions optoélectroniques nouvelles pour les générations futures de systèmes optiques. Il s'agit notamment des systèmes de télécommunications à détection directe à grand produit débit x portée, des systèmes cohérents, tirant parti du gain en sensibilité de la détention homodyne ou hétérodyne, et des futurs réseaux monomodes à multiplexage en fréquence optique (réseaux «multicolores») exploitant également la sélectivité fréquentielle de ces techniques de détection, ou même encore des systèmes de télécommunications optiques spatiaux et des senseurs optiques.

PHR

Fréquence optique accordable.

Spanish

Save record 4

Record 5 1985-03-01

English

Subject field(s)
  • Computer Graphics
CONT

A video modulator consists of a carrier frequency oscillator(usually in the channel 3 or 4 range) and a circuit to vary its amplitude as a function of the video signal' s intensity(to amplitude-modulate it).

French

Domaine(s)
  • Infographie

Spanish

Save record 5

Record 6 1983-12-01

English

Subject field(s)
  • Electronic Circuits Technology
CONT

The transmitter pulse-repetition frequency(PRF) in the T/R mode is controlled by the range computer, which generates trigger signals to pulse the modulator.

French

Domaine(s)
  • Technologie des circuits électroniques

Spanish

Save record 6

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