TERMIUM Plus®

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FREQUENCY MODE OPERATION [3 records]

Record 1 2019-09-13

English

Subject field(s)
  • Electronic Circuits Technology
  • Electrical Engineering
CONT

Heterodyne detection with weak-link devices. A rather different mode of operation is to use the Josephson effect device as a heterodyne mixer to convert from millimeter wavelength to a convenient(that is, lower) frequency where conventional infrared amplification can operate.

French

Domaine(s)
  • Technologie des circuits électroniques
  • Électrotechnique

Spanish

Save record 1

Record 2 2002-10-30

English

Subject field(s)
  • Air Navigation Aids
  • Search and Rescue (Aircraft)
CONT

British made Search And Rescue And Homing(SARAH) beacon SRI 23006 was a UHF rescue beacon comprising speech unit, transmitter/receiver unit, coding unit and combined LT/HT battery. The first three units are permanently interconnected. Attached to the transmitter/receiver unit is a leaf spring aerial which fold up to very small dimensions. The SARAH beacon has three modes of operation. In the normal beacon condition pulses on a frequency of 243 MHz are being automatically transmitted. The pulses are transmitted in a rate of 210 pairs per second, the spacing between the pulses in each pair is determined by the coding unit and is a distinguishing feature between the beacons.(Note that the normal beacon operation has much in common with the war-time developed "Walter" beacon). The peak power in this mode is 15 watts and the battery life is about 20 hours continuous operation.

French

Domaine(s)
  • Aides à la navigation aérienne
  • Recherches et sauvetages (Aviation)

Spanish

Save record 2

Record 3 1995-11-22

English

Subject field(s)
  • Engineering Tests and Reliability
DEF

A mode of operation where the frequency of demands for operation made on a safety-related system is significantly greater than the proof check frequency.

OBS

Draft International Standard 1508, IEC-TC 65, Functional Safety, 1995.

French

Domaine(s)
  • Fiabilité, contrôle et essais (Ingénierie)
OBS

Projet de norme internationale 1508, CEI-TC65, Sûreté fonctionnelle, 1995.

Spanish

Save record 3

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