TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

Automatic link establishment(ALE) is the principle where a specialized radio modem, known as an ALE adaptive controller, is assigned the task of automatically controlling a HF [high frequency] receiver and transmitter in order to establish the highest quality communication link with 1 or multiple HF [high frequency] radio stations.  3, record 1, English, - automatic%20link%20establishment

Record 1,  Textual support,  French

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  French

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

... the airlines-in conjunction with Aeronautical Radio Inc-are... evolving what is to a large extent a VHF/HF [very high frequency/high frequency] digitized communications system. ACARS(ARINC Communications Addressing and Reporting System).  4, record 3, English, - aircraft%20communications%20addressing%20and%20reporting%20system

Record number: 3, Textual support number: 2 CONT

Used in conjunction with the [ACARS] computer located in the cockpit, an array of new services is available to the traveller. Since ACARS is linked to ground computers, passengers on delayed flights will be able to make and confirm new connections and reservations ... ACARS can be used to order special meals ... KLM [airlines] is fitting ACARS to its fleet ...  5, record 3, English, - aircraft%20communications%20addressing%20and%20reporting%20system

Record number: 3, Textual support number: 1 OBS

ARINC: Aeronautical Radio, Incorporated.  6, record 3, English, - aircraft%20communications%20addressing%20and%20reporting%20system

Record number: 3, Textual support number: 2 OBS

aircraft communications addressing and reporting system; ACARS: term and abbreviation officially approved by the International Civil Aviation Organization (ICAO).  7, record 3, English, - aircraft%20communications%20addressing%20and%20reporting%20system

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 OBS

système d'échange de données sur réseau ARINC; ACARS : terme et abréviation uniformisés par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Opérations aériennes.  4, record 3, French, - syst%C3%A8me%20embarqu%C3%A9%20de%20communications%2C%20d%27adressage%20et%20de%20compte%20rendu

Record number: 3, Textual support number: 2 OBS

système embarqué de communications, d'adressage et de compte rendu; ACARS : terme et abréviation uniformisés par l'Organisation de l'aviation civile internationale (OACI).  3, record 3, French, - syst%C3%A8me%20embarqu%C3%A9%20de%20communications%2C%20d%27adressage%20et%20de%20compte%20rendu

Record 3,  Textual support,  Spanish

Record number: 3, Textual support number: 1 OBS

sistema de direccionamiento e informe para comunicaciones de aeronaves; ACARS: término y abreviatura aceptados oficialmente por la Organización de Aviación Civil Internacional (OACI).  3, record 3, Spanish, - sistema%20de%20direccionamiento%20e%20informe%20para%20comunicaciones%20de%20aeronaves

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

Most oceanic air traffic control, up to now, has relied on voice communications with aircraft to determine their positions. This voice communication, over HF [high frequency] radio, was combined with a time-consuming process to plan routes, separate the aircraft safely, and monitor their positions.  2, record 4, English, - oceanic%20air%20traffic%20control

Record 4,  Textual support,  French

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

The absence of real-time surveillance over the North Atlantic is exacerbated by the continuing inability of oceanic air traffic controllers to communicate directly with aircraft overflying the Atlantic. Today's communications rely upon high frequency(HF) radios requiring specialist radio operators as intermediaries between pilots and controllers.  1, record 5, English, - oceanic%20air%20traffic%20controller

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 CONT

L'absence de surveillance en temps réel au-dessus de l'Atlantique Nord est aggravée par le fait que les contrôleurs de la circulation aérienne océanique ne peuvent jamais communiquer directement avec les avions qui survolent l'océan. Les télécommunications modernes se font au moyen de radios haute fréquence (HF) et elles doivent être relayées par un opérateur radio spécialisé entre les pilotes et les contrôleurs.  1, record 5, French, - contr%C3%B4leur%20de%20la%20circulation%20a%C3%A9rienne%20oc%C3%A9anique

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 OBS

524.06: military occupation code for non-commissioned members.  2, record 6, English, - AN%2FARC%2D505%20HF%20Radio%20and%20490T%2F180%201%2D3%20Antenna%20Coupler%20Second%20Level%20Maintenance

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 OBS

524.06 : code de groupe professionnel militaire pour les militaires du rang.  2, record 6, French, - Radio%20HF%20%28AN%2FARC%2D505%29%20et%20coupleur%20d%27antenne%20%28490T%2F180%201%2D3%29%20%2D%20Maintenance%20de%20deuxi%C3%A8me%20niveau

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 OBS

522.47: trade specialty qualification code.  2, record 7, English, - Radio%2DHF%2DAN%2FARC%2038

Record number: 7, Textual support number: 2 OBS

This is an obsolete title.  2, record 7, English, - Radio%2DHF%2DAN%2FARC%2038

Record 7,  Textual support,  French

Record number: 7, Textual support number: 1 OBS

522.47 : code de qualification de spécialiste (métiers).  2, record 7, French, - Radio%20AN%2FARC%2038%20HF

Record number: 7, Textual support number: 2 OBS

Ce titre est d'usage périmé.  2, record 7, French, - Radio%20AN%2FARC%2038%20HF

Record 7,  Textual support,  Spanish

Record 8,  Textual support,  English

Record number: 8, Textual support number: 1 OBS

STANAGS (Standardization Agreements) are NATO publications used by the Department of National Defence as works of reference.  2, record 8, English, - Introduction%20of%20modern%20radio%20equipment%20for%20naval%20HF%2C%20MF%20and%20LF%20shore%2Dto%2Dship%20broadcasts

Record number: 8, Textual support number: 2 OBS

STANAG 5031: NATO standardization agreement code.  2, record 8, English, - Introduction%20of%20modern%20radio%20equipment%20for%20naval%20HF%2C%20MF%20and%20LF%20shore%2Dto%2Dship%20broadcasts

Record 8,  Textual support,  French

Record number: 8, Textual support number: 1 OBS

STANAG 5031 : code d'accord de normalisation de l'OTAN.  2, record 8, French, - Mise%20en%20service%20de%20mat%C3%A9riel%20radio%20moderne%20pour%20les%20liaisons%20navales%20HF%2C%20MF%20et%20LF%20navire%2Dterre

Record 8,  Textual support,  Spanish

Record 9,  Textual support,  English

Record number: 9, Textual support number: 1 OBS

STANAGS (Standardization Agreements) are NATO publications used by the Department of National Defence as works of reference.  2, record 9, English, - Characteristics%20of%201200%2F2400%2F3600%20bits%20per%20second%20single%20tone%20modulators%2Fdemodulators%20for%20HF%20radio%20links

Record number: 9, Textual support number: 2 OBS

STANAG 4285: NATO standardization agreement code.  2, record 9, English, - Characteristics%20of%201200%2F2400%2F3600%20bits%20per%20second%20single%20tone%20modulators%2Fdemodulators%20for%20HF%20radio%20links

Record 9,  Textual support,  French

Record number: 9, Textual support number: 1 CONT

STANAG 4285 : code d'accord de normalisation de l'OTAN.  2, record 9, French, - Caract%C3%A9ristiques%20des%20modulateurs%2Fd%C3%A9modulateurs%20%C3%A0%201200%2F2400%2F3600%20bits%2Fs%20%C3%A0%20modulation%20s%C3%A9rie%20pour%20les%20liaisons%20radio%C3%A9lectriques%20dans%20la%20bande%20de%20fr%C3%A9quences%20d%C3%A9cam%C3%A9triques

Record 9,  Textual support,  Spanish

Record 10,  Textual support,  English

Record number: 10, Textual support number: 1 OBS

STANAGS (Standardization Agreements) are NATO publications used by the Department of National Defence as works of reference.  2, record 10, English, - Technical%20standards%20for%20single%20channel%20HF%20radio%20equipment

Record number: 10, Textual support number: 2 OBS

STANAG 4203: NATO standardization agreement code.  2, record 10, English, - Technical%20standards%20for%20single%20channel%20HF%20radio%20equipment

Record 10,  Textual support,  French

Record number: 10, Textual support number: 1 OBS

STANAG 4203 : code d'accord de normalisation de l'OTAN.  2, record 10, French, - Normes%20techniques%20pour%20les%20mat%C3%A9riels%20radio%C3%A9lectriques%20%C3%A0%20voie%20unique%20%C3%A0%20ondes%20d%C3%A9cam%C3%A9triques

Record 10,  Textual support,  Spanish

Record 11,  Textual support,  English

Record number: 11, Textual support number: 1 OBS

STANAGS (Standardization Agreements) are NATO publications used by the Department of National Defence as works of reference.  2, record 11, English, - Modulation%20and%20coding%20characteristics%20that%20must%20be%20common%20to%20assure%20interoperability%20of%202400%20bps%20linear%20predictive%20encoded%20digital%20speech%20transmitted%20over%20HF%20radio%20facilities

Record number: 11, Textual support number: 2 OBS

STANAG 4197: NATO standardization agreement code.  2, record 11, English, - Modulation%20and%20coding%20characteristics%20that%20must%20be%20common%20to%20assure%20interoperability%20of%202400%20bps%20linear%20predictive%20encoded%20digital%20speech%20transmitted%20over%20HF%20radio%20facilities

Record 11,  Textual support,  French

Record number: 11, Textual support number: 1 OBS

STANAG 4197 : code d'accord de normalisation de l'OTAN.  2, record 11, French, - Caract%C3%A9ristiques%20de%20modulation%20et%20de%20codage%20qui%20doivent%20%C3%AAtre%20communes%20pour%20assurer%20l%27interop%C3%A9rabilit%C3%A9%20des%20%C3%A9quipements%20de%20phonie%20num%C3%A9rique%20%C3%A0%20codage%20pr%C3%A9dictif%20lin%C3%A9aire%20%C3%A0%202%2C4%20kbits%2Fs%20utilis%C3%A9s%20pour%20les%20transmissions%20radio%2D%C3%A9lectriques%20%C3%A0%20ondes%20d%C3%A9cim%C3%A9triques

Record 11,  Textual support,  Spanish

Record 12,  Textual support,  English

Record number: 12, Textual support number: 1 OBS

522.73: trade specialty qualification code.  2, record 12, English, - Radio%2DHF%2DAN%2FARC%20508

Record number: 12, Textual support number: 2 OBS

This is an obsolete title.  2, record 12, English, - Radio%2DHF%2DAN%2FARC%20508

Record 12,  Textual support,  French

Record number: 12, Textual support number: 1 OBS

522.73 : code de qualification de spécialiste (métiers).  2, record 12, French, - Radio%20AN%2FARC%20508%20%2D%20HF

Record number: 12, Textual support number: 2 OBS

Ce titre est d'usage périmé.  2, record 12, French, - Radio%20AN%2FARC%20508%20%2D%20HF

Record 12,  Textual support,  Spanish

Record 13,  Textual support,  English

Record number: 13, Textual support number: 1 OBS

522.10: trade specialty qualification code.  2, record 13, English, - Radio%2DHF%2FSSB%2DAN%2FARC%20505

Record number: 13, Textual support number: 2 OBS

This is an obsolete title.  2, record 13, English, - Radio%2DHF%2FSSB%2DAN%2FARC%20505

Record 13,  Textual support,  French

Record number: 13, Textual support number: 1 OBS

522.10 : code de qualification de spécialiste (métiers).  2, record 13, French, - Radio%20AN%2FARC%20505%20%2D%20HF%2FSSB

Record number: 13, Textual support number: 2 OBS

Ce titre est d'usage périmé.  2, record 13, French, - Radio%20AN%2FARC%20505%20%2D%20HF%2FSSB

Record 13,  Textual support,  Spanish

Record 14,  Textual support,  English

Record number: 14, Textual support number: 1 OBS

522.03: trade specialty qualification code.  2, record 14, English, - HF%20Radio%20System%20AN%2FARC%2D512%20and%20UHF%20Control%20C5334%2FARC514%2DMaintenance

Record number: 14, Textual support number: 2 OBS

This is an obsolete title.  2, record 14, English, - HF%20Radio%20System%20AN%2FARC%2D512%20and%20UHF%20Control%20C5334%2FARC514%2DMaintenance

Record 14,  Textual support,  French

Record number: 14, Textual support number: 1 OBS

522.03 : code de qualification de spécialiste (métiers).  2, record 14, French, - Syst%C3%A8me%20radio%20AN%2FARC%2D512%20et%20commande%20VHFC%205334%2FARC514%20%2D%20Maintenance

Record number: 14, Textual support number: 2 OBS

Ce titre est d'usage périmé.  2, record 14, French, - Syst%C3%A8me%20radio%20AN%2FARC%2D512%20et%20commande%20VHFC%205334%2FARC514%20%2D%20Maintenance

Record 14,  Textual support,  Spanish

Record 15,  Textual support,  English

Record number: 15, Textual support number: 1 DEF

polar cap absorption events : Episodes of intense absorption of HF and VHF radio waves over the polar caps caused by excess ionization resulting from an influx of solar energetic particles into the upper atmosphere.  2, record 15, English, - polar%20cap%20absorption%20event

Record number: 15, Textual support number: 1 CONT

A polar cap absorption event results from the ionisation of the D-layer of the polar ionosphere by high energy protons. A PCA causes a HF radio blackout for transpolar circuits and can last several days. PCAs are almost always preceded by a major solar flare with the time between the flare event and the onset of the PCA ranging from few minutes to several hours.  4, record 15, English, - polar%20cap%20absorption%20event

Record number: 15, Textual support number: 2 CONT

PCA events have a pronounced diurnal variation, being much more intense during daytime than at night, and typically last for two to three days.  2, record 15, English, - polar%20cap%20absorption%20event

Record 15,  Textual support,  French

Record number: 15, Textual support number: 1 DEF

[...] événements associés à des particules puissantes provenant du Soleil [lesquelles] produisent une ionisation intense dans la région D (between 50 and 90 km altitude) de l'ionosphère au-dessus des calottes polaires.  1, record 15, French, - %C3%A9v%C3%A9nement%20d%27absorption%20dans%20la%20calotte%20polaire

Record number: 15, Textual support number: 1 CONT

[Les] événements d'absorption dans la calotte polaire [sont appelés ainsi] parce que l'ionisation accrue [dans la région D] absorbe les ondes radio HF et VHF. Les événements d'absorption dans la calotte polaire peuvent être étudiés à l'aide de riomètres.  1, record 15, French, - %C3%A9v%C3%A9nement%20d%27absorption%20dans%20la%20calotte%20polaire

Record number: 15, Textual support number: 2 CONT

Il est souvent impossible d'établir des radiocommunications à haute fréquence pendant la durée des évènements d'ACP.  2, record 15, French, - %C3%A9v%C3%A9nement%20d%27absorption%20dans%20la%20calotte%20polaire

Record number: 15, Textual support number: 1 OBS

évènement : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004).  5, record 15, French, - %C3%A9v%C3%A9nement%20d%27absorption%20dans%20la%20calotte%20polaire

Record 15,  Textual support,  Spanish

Record 16,  Textual support,  English

Record number: 16, Textual support number: 1 CONT

Raytheon's IMS [Integrated Maritime Surveillance] uses land-based long-range surface wave radar, which transmits high frequency(HF) radio waves that follow the earth's curvature. The SWR-503 Surface Wave Radar detects and tracks aircraft, surface vessels and icebergs out to 500 km from the shore in a sector of up to 120 degrees. The radar also provides current and surface wind data. At an Operations Control Centre, the IMS system correlates detections from surface wave radar sites with identification information from ADS systems and other sensors. All of this data is fused to create a database and display system providing a complete picture of surface and air activity in the EEZ. Vessel tracks can be run backward and forward in time, enhancing military patrols and coast guard search-and-rescue efforts as well as oil spill control, drug interdiction, and iceberg alerts. Applications for HF Surface Wave Radar are being developed in fields such as Theatre Ballistic Missile and Meteor Shower Detection.  5, record 16, English, - high%2Dfrequency%20surface%20wave%20radar

Record 16,  Textual support,  French

Record number: 16, Textual support number: 1 CONT

Un radar haute fréquence à ondes de surface (RHFOS) ultraperfectionné que Raytheon Canada Limited (RCL) a conçu afin de détecter la présence de petits navires et d'aéronefs volant à basse altitude a été présenté avec succès à la Drug Enforcement Agency des États-Unis.  2, record 16, French, - radar%20haute%20fr%C3%A9quence%20%C3%A0%20ondes%20de%20surface

Record 16,  Textual support,  Spanish

Record 17,  Textual support,  English

Record number: 17, Textual support number: 1 CONT

The behaviour of the ionosphere and HF [High Frequency] wave propagation parameters and their possible changes can be described using ionospheric oblique sounding (IOS) data. With the help of this method the maximum observed frequency (MOF), the maximum useable frequency (MUF), the lowest observed frequency (LOF), the number of propagation modes and the signal delays can be determined.  2, record 17, English, - oblique%20ionospheric%20sounding

Record number: 17, Textual support number: 1 OBS

The changing state of the ionosphere is generally monitored by networks of vertical ionosondes. These radars transmit and receive HF(1-30MHz) radio waves to and from the ionosphere directly above the monitoring station. The result is real-time information on the state of the ionosphere needed by communications users allowing them to adapt their operational systems accordingly. The oblique ionospheric sounder extends this idea. The transmitter and receiver of the oblique sounder are not co-located like the vertical but are generally hundreds thousands of kilometres apart. So the instrument is able to study how the radio signals of real communications(below 30MHz) propagate via the ionosphere under a variety of conditions. However the interpretation of the oblique propagation is also significantly harder than the case of the vertical.  3, record 17, English, - oblique%20ionospheric%20sounding

Record 17,  Textual support,  French

Record number: 17, Textual support number: 1 PHR

Station de réception par sondage oblique passif.  3, record 17, French, - sondage%20oblique

Record 17,  Textual support,  Spanish

Record 18,  Textual support,  English

Record number: 18, Textual support number: 1 CONT

Automatic radio telephone system(ARTS) is dedicated for :-Automatized radio telephone communication with the ships.-Automatic voice exchange with the ships by using DSC procedures in accordance to ITU-R M. 689 recommendation for VHF and ITU-R M. 1082 for MF/HF.-Computing registration of processed telephone connections. ARTS provides :-Use of new and existing transmitting-receiving equipment;-System expansion(connection of additional telephone adapters and transmitting-receiving equipment) ;-Use of automatized DSC procedures providing partial or full automation of connection process.  3, record 18, English, - automatic%20radio%20telephone

Record 18,  Textual support,  French

Record number: 18, Textual support number: 1 CONT

À cette structure de base, il faut ajouter les centres de téléphonie sous-marine (câbles), les centres de radiotéléphonie et de radiotélégraphie maritime, les stations de radiotéléphone automatique (bi-bops et Cie) et enfin les stations de transit des télécommunications spatiales (satellites).  3, record 18, French, - radiot%C3%A9l%C3%A9phone%20automatique

Record 18,  Textual support,  Spanish

Record 19,  Textual support,  English

Record number: 19, Textual support number: 1 CONT

The HF radio system primarily operates in single sideband using various audio modes with a transmitting power of up to 1 kW.  1, record 19, English, - transmitting%20power

Record 19,  Textual support,  French

Record 19,  Textual support,  Spanish

Record 20,  Textual support,  English

Record number: 20, Textual support number: 1 OBS

Project M1506 for the Maritime Forces.  2, record 20, English, - Radio%20VLF%2FHF%20Replacements

Record 20,  Textual support,  French

Record number: 20, Textual support number: 1 OBS

Projet M1506 pour la Marine.  1, record 20, French, - remplacement%20des%20radios%20VLF%2FHF

Record 20,  Textual support,  Spanish

Record 21,  Textual support,  English

Record number: 21, Textual support number: 1 OBS

For reception and transmission of messages or calls in the MF and HF bands [Scheveningen Radio] has 17 radiotelegraphy switchboards, 24 for radiotelephony and 7 for the modern and efficient TOR services(telex over radio) ;it enables ships and drilling platforms equipped with a teleprinter to correspond directly with telex subscribers on shore. The TOR equipment takes care of fast and faultless transmission by radio of telex correspondences.  2, record 21, English, - Telex%20Over%20Radio

Record 21,  Textual support,  French

Record number: 21, Textual support number: 1 OBS

Pour l'émission et la réception de messages ou d'appels dans les bandes d'ondes hectométriques et décamétriques [Scheveningen Radio] dispose de 17 pupitres de radiotélégraphie; elle en a 24 pour la radiotéléphonie et 7 pour le radiotélex (TOR), service moderne et efficace qui permet aux navires et aux plates-formes de forage équipés d'un téléimprimeur de correspondre directement avec des abonnés télex à terre. Le système TOR permet d'acheminer rapidement et sans erreur des messages télex par voie radioélectrique.  2, record 21, French, - radiot%C3%A9lex

Record 21,  Textual support,  Spanish

Record 22,  Textual support,  English

Record number: 22, Textual support number: 1 CONT

On HF-1 control, set frequency control switches to frequency of local HF AM upper sideband radio station.  4, record 22, English, - upper%20sideband

Record 22,  Textual support,  French

Record number: 22, Textual support number: 1 OBS

Terme uniformisé par le CUTA opérations aériennes.  3, record 22, French, - bande%20lat%C3%A9rale%20sup%C3%A9rieure

Record 22,  Textual support,  Spanish

Record 23,  Textual support,  English

Record number: 23, Textual support number: 1 CONT

The exception to this is when an analogue transmission is required because either an HF single sideband radio is not equipped with a modem, or a telephone line is of extremely poor quality.  1, record 23, English, - HF%20single%20sideband%20radio

Record 23,  Textual support,  French

Record number: 23, Textual support number: 1 CONT

... font que le cryptement de la phonie par brouillage n'est plus guère utilisé, surtout si l'on est obligé d'émettre en analogique avec un poste HF-BLU dépourvu de modem ou avec une ligne téléphonique de très mauvaise qualité.  1, record 23, French, - poste%20HF%2DBLU

Record 23,  Textual support,  Spanish

Record 24,  Textual support,  English

Record number: 24, Textual support number: 1 CONT

The price of satellites no doubt influenced this, but the main factors contributing to the comeback of the HF radio were the improvements introduced by industry : new modulation techniques, frequency synthesis and increased data transfer capabilities to name but a few.  1, record 24, English, - modulation%20technique

Record 24,  Textual support,  French

Record number: 24, Textual support number: 1 CONT

Le coût élevé des satellites y est certainement pour quelque chose mais la raison principale du retour en grâce de la HF tient aux progrès réalisés par l'industrie : nouvelles techniques de modulation, synthèse de fréquences et augmentation des cadences de transmission de données pour n'en citer que quelques-unes.  1, record 24, French, - techniques%20de%20modulation

Record 24,  Textual support,  Spanish

Record 25,  Textual support,  English

Record number: 25, Textual support number: 1 CONT

This stream is easier to encrypt and more adaptable to spread spectrum techniques than regular audio signals and is already in a format that is recognized by packet switching networks. Since even the most advance HF modem cannot handle 16 000 bit per second, the rate is reduced to 2 400 bits per second before transmitting and is converted back to the CVSD format by the receiving radio.  1, record 25, English, - spread%20spectrum%20techniques

Record 25,  Textual support,  French

Record number: 25, Textual support number: 1 CONT

Elle consiste à convertir le signal audio en un flux de données à 16 000 bit/ seconde, plus facile à crypter et à adapter aux techniques de spectre étalé que le signal audio brut.  1, record 25, French, - techniques%20de%20spectre%20%C3%A9tal%C3%A9

Record 25,  Textual support,  Spanish

Record 26,  Textual support,  English

Record number: 26, Textual support number: 1 CONT

The path of refraction is also frequency-dependent, which means that to reach a specific receiv-er, an HF radio operator will not be able to select from the full band of channels.  1, record 26, English, - frequency%2Ddependent

Record 26,  Textual support,  French

Record number: 26, Textual support number: 1 CONT

Les trajectoire de propagation varient avec la fréquence, de sorte qu'en un lieu et e un instant donnés, une partie seule ment de la bande HF est utilisable.  1, record 26, French, - varie%20avec%20la%20fr%C3%A9quence

Record 26,  Textual support,  Spanish

Record 27,  Textual support,  English

Record number: 27, Textual support number: 1 CONT

The price of satellites no doubt influenced this, but the main factors contributing to the comeback of the HF radio were the improvements introduced by industry : new modulation techniques, frequency synthesis and increased data transfer capabilities to name but a few.  1, record 27, English, - frequency%20synthesis

Record 27,  Textual support,  French

Record number: 27, Textual support number: 1 CONT

Le coût élevé des satellites y est certainement pour quelque chose mais la raison principale du retour en grâce de la HF tient aux progrès réalisés par l'industrie : nouvelles techniques de modulation, synthèse de fréquences et augmentation des cadences de transmission de données pour n'en citer que quelques-unes.  1, record 27, French, - synth%C3%A8se%20de%20fr%C3%A9quences

Record 27,  Textual support,  Spanish

Record 28,  Textual support,  English

Record number: 28, Textual support number: 1 CONT

The Radio Set...(HF radio system) is a dual system using two Radio Sets...(HF-1 and HF-2 radio sets) to provide long-range, two-way radio communication.  2, record 28, English, - HF%20radio%20system

Record 28,  Textual support,  French

Record 28,  Textual support,  Spanish

Record 29,  Textual support,  English

Record number: 29, Textual support number: 1 OBS

When HF radio sets are transmitting radio signals, voltages dangerous to life are present at the output of the power amplifiers, the antenna couplers, the lightning arrestors, the overhead wire antennas, and the interconnecting RF feed lines.  1, record 29, English, - RF%20feed%20line

Record 29,  Textual support,  French

Record 29,  Textual support,  Spanish

Record 30,  Textual support,  English

Record number: 30, Textual support number: 1 OBS

The Radio Set(...)(HF radio system) is a dual system using two Radio Sets(...)(HF-1 and HF-2 radio sets) to provide long-range, two-way radio communications.  1, record 30, English, - radio%20set

Record 30,  Textual support,  French

Record 30,  Textual support,  Spanish