Very low frequency (original) (raw)
VLF ( Very Low Frequency , Freqüència Molt Baixa ) és la banda de l'espectre electromagnètic de freqüència de 10 kHz a 30 kHz. A aquesta banda la propagació és per ona de superfície, amb baixa atenuació. Permet emetre ones de ràdio a gran distància. Com inconvenient cal destacar l'escassa amplada de banda disponible, i la poca eficàcia de les antenes a tan baixes freqüències.
| Property | Value |
|---|---|
| dbo:abstract | VLF ( Very Low Frequency , Freqüència Molt Baixa ) és la banda de l'espectre electromagnètic de freqüència de 10 kHz a 30 kHz. A aquesta banda la propagació és per ona de superfície, amb baixa atenuació. Permet emetre ones de ràdio a gran distància. Com inconvenient cal destacar l'escassa amplada de banda disponible, i la poca eficàcia de les antenes a tan baixes freqüències. (ca) التردد شديد الانخفاض (بالإنجليزية: Very low frequency) اختصاراً VLF، وفق الاتحاد الدولي للاتصالات هو تردد لموجات الراديو يتراوح بين 3 إلى 30 ألف هرتز، وذلك يوافق طول موجة من 100 إلى 10 كيلومتر، على الترتيب. لهذه الموجة عرض نطاق محدود، ولذلك لا تستخدم لنقل ، إنما فقط لنقل الإشارات المشفرة. (ar) Υπερμακρά κύματα (Αγγλική γλώσσα very low frequency, VLF) είναι η ονομασία των ηλεκτρομαγνητικών κυμάτων του φάσματος συχνοτήτων από 3 έως 30kHz . Το εύρος συχνοτήτων κάτω από 9 kHz δεν απασχολεί τον διεθνή οργανισμό τηλεπικοινωνιών (ITU). (el) Als Längstwellen (englisch very low frequency, kurz VLF) bezeichnet man elektromagnetische Wellen im Frequenzbereich von 3 bis 30 kHz (nicht zu verwechseln mit Niederfrequenz (< 3 kHz); siehe Frequenzband). Der Frequenzbereich unter 9 kHz unterliegt von Seiten der internationalen Fernmeldeorganisation (ITU) keiner Regulierung. (de) La designación de frecuencia muy baja (VLF; Very Low Frequency, en inglés) se usa para denominar a la banda del espectro electromagnético que ocupa el rango de frecuencias de 3 a 30 kilohercios (longitudes de onda de 100 a 10 kilómetros). (es) La très basse fréquence, en anglais Very low frequency (VLF), désigne la bande de radiofréquences qui s'étend de 3 kHz à 30 kHz (longueur d'onde de 100 à 10 km).Les ondes VLF sont aussi appelées ondes myriamétriques (le myria- est un préfixe obsolète valant 10 000). (fr) Very low frequency o VLF (in inglese frequenza molto bassa) è il nome che convenzionalmente è stato assegnato alle radiofrequenze comprese tra 3 e 30 kHz, cui corrispondono lunghezze d'onda tra i 100 e 10 chilometri. La sigla rappresenta una delle bande radio definite dalla ITU-R nella raccomandazione V.431 e la cui origine risale alla IV conferenza del comitato CCIR che si tenne a Bucarest nel 1937, i cui lavori furono ratificati dalla International Radio Conference di Atlantic City del 1947. Dal momento che per segnali radio trasmessi con queste frequenze non è disponibile un'ampia larghezza di banda, le VLF vengono impiegate per trasmettere informazioni molto semplici, come quelle utilizzate per la radionavigazione. La banda viene anche chiamata "banda miriametrica" o delle "onde miriametriche", dal nome del miriametro, un'unità di misura obsoleta pari a 10 chilometri. (it) 超長波（ちょうちょうは、VLF（Very Low Frequency））とは、3 - 30kHzの周波数の電波をいう。波長は10 - 100km、ミリアメートル波とも呼ばれる。 (ja) Very low frequency or VLF is the ITU designation for radio frequencies (RF) in the range of 3–30 kHz, corresponding to wavelengths from 100 to 10 km, respectively. The band is also known as the myriameter band or myriameter wave as the wavelengths range from one to ten myriameters (an obsolete metric unit equal to 10 kilometers). Due to its limited bandwidth, audio (voice) transmission is highly impractical in this band, and therefore only low data rate coded signals are used. The VLF band is used for a few radio navigation services, government time radio stations (broadcasting time signals to set radio clocks) and for secure military communication. Since VLF waves can penetrate at least 40 meters (131 ft) into saltwater, they are used for military communication with submarines. (en) Met very low frequency of VLF worden frequenties in het radiospectrum aangeduid tussen 3 en 30 kHz. De radiogolven hebben een golflengte tussen 10 en 100 kilometer. Aangezien er vergeleken met de hogere frequenties weinig bandbreedte is in deze band, worden enkel de allereenvoudigste signalen gebruikt, zoals Morsecode en signalen voor radionavigatie, maar geen spraak. (nl) Fale bardzo długie (fale myriametrowe, VLF – z ang. very low frequency) – zakres fal radiowych o częstotliwości: 3–30 kHz (długości 10–100 km). (pl) VLF, Very Low Frequency, är radiofrekvenser mellan 3 och 30 kHz d.v.s. våglängder mellan 10 och 100 km. Radiostationen i Grimeton sänder på 17,2 kHz. VLF-bandet är även känt som myriameterbandet eller myriametervågor. (sv) VLF é a sigla para Very Low Fequency - Frequências Ultra Baixas Radiação eletromagnética com esta frequência é emitida, por exemplo, pelas linhas de transmissão de energia elétrica em corrente alternada. Também é usada para a rede de comunicação via rádio de submarinos. As antenas para este tipo de rádio-comunicação são enormes, devido ao grande comprimento de onda. Frequências Ultra Baixas são usadas para examinar os problemas geoambientais em camadas sedimentares rasas e de baixa condutividade, na exploração de águas subterrâneas e na localização da posição de corpos de fontes anômalas sob a superfície. A tecnologia eletromagnética VLF é usada na faixa de frequência de 15 a 30 kHz. A VLF utiliza também as ondas portadoras de transmissão de comunicações distantes e poderosas de organizações militares. VLF também é usado para sinalizadores de navegação por rádio (alfa) e sinais de tempo (beta). VLF também é usado em pesquisas geofísicas eletromagnéticas.Historicamente, esta banda foi usada para comunicação de rádio transcontinental durante a era telegráfica sem fio entre 1900 e 1925. Nações construíram redes de estações de rádio LF e VLF de alta potência que transmitiam informações de texto pelo código Morse, para se comunicar com suas colônias e frotas navais. Tentativas iniciais foram feitas para usar em radiotelefonia usando modulação de amplitude e modulação de banda unilateral dentro da banda a partir de 20 kHz, mas o resultado foi insatisfatório porque a largura de banda disponível era insuficiente para conter as bandas laterais. (pt) Сверхдлинные волны — радиоволны с длиной волны свыше 10 км. Они легко огибают Землю, слабо поглощаются земной поверхностью, проникают вглубь морской воды, хорошо отражаются от ионосферы. (ru) Наддо́вгі радіохви́лі (англ. Very low frequency, VLF) — радіохвилі довжиною 10–100 км (частота 3–30 кГц) і довше. Іноді вживається назва міріаметрові хвилі (від назви позасистемної метричної міри довжини , що дорівнює 10000 метрів) або міріаметровий діапазон. (uk) 甚低頻（VLF, Very Low Frequency）是指由國際電信聯盟定義的頻帶由3KHz到30KHz的無線電波。其波長為100公里到10公里，因此又稱為萬米波。 萬米波由於其帶寬有限，比較難以傳播語音信號，並且只能使用低數據速率編碼系統。VLF頻段可以用於無線電導航服務、軍事通訊、政府授時、無線電時鐘。由於VLF波可以穿透至少40公尺海水，因此它們被用於潛艇通信。 (zh) |
| dbo:thumbnail | wiki-commons:Special:FilePath/VLFatPalmer.jpg?width=300 |
| dbo:wikiPageExternalLink | http://spaceweather.com/glossary/inspire.html http://www.vlf.it/frequency/bands.html http://www.vlf.it http://moondog.astro.louisville.edu/index.html http://webflash.ess.washington.edu/ http://www.markyd26uk.110mb.com/vlf.html http://www.vlfradio.com/ http://www.lwca.org http://www.magnet-ferritantennen.de/assets/plugindata/poola/funkamateur012006.pdf http://sidstation.loudet.org/stations-list-en.xhtml http://www.qsl.net/iw0bzd/VLF_TUBE_RX.htm https://groups.io/g/VLF http://www.ab9il.net/vlf/vlf1.html http://vlf.stanford.edu/research/introduction-vlf |
| dbo:wikiPageID | 160505 (xsd:integer) |
| dbo:wikiPageLength | 39089 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1119127102 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Amplitude_modulation dbr:Q_factor dbr:Electrical_breakdown dbr:Electromagnetic_interference dbr:Electron_precipitation dbr:List_of_VLF-transmitters dbr:Modulation dbr:Monopole_antenna dbr:Beta_(time_signal) dbr:Phase-shift_keying dbr:Resonance dbr:Rhauderfehn dbr:US_Navy dbr:VLF_Transmitter_Cutler dbr:Vileyka_VLF_transmitter dbr:Capacitive_reactance dbr:Electromagnetic dbr:Lightning dbr:Transformer_types dbr:Umbrella_antenna dbr:Noviken_VLF_Transmitter dbr:Corona_discharge dbr:OMEGA_Navigation_System dbr:One-time_pad dbr:Standard_time_and_frequency_signal dbr:Radio_noise dbr:WWVL dbr:Alexanderson_Day dbr:Electrical_length dbr:Electron dbr:Encrypted dbr:Geophysics dbr:Gildeskål dbr:Morse_code dbr:Myriameter dbr:Continuous_phase_modulation dbr:Coronal_mass_ejection dbr:T-aerial dbr:Anthorn_Radio_Station dbr:Loop_antenna dbr:Lualualei_VLF_transmitter dbr:Shortwave dbr:Sindh dbr:Single-sideband_modulation dbr:Skelton_Transmitting_Station dbr:Communication_with_submarines dbr:Harmonics_(electrical_power) dbr:Phase_(waves) dbr:Magnetosphere dbr:Spectrogram dbr:576i dbc:Radio_spectrum dbr:Data_signaling_rate dbr:GPS_disciplined_oscillator dbr:HWU_transmitter dbr:Ion dbr:Earth-ionosphere_waveguide dbr:Loading_coil dbr:Seawater dbr:ASCII dbr:Acres dbr:480i dbr:Cutler,_Maine dbr:Alpha_(navigation) dbr:Exmouth,_Western_Australia dbr:Bandwidth_(signal_processing) dbr:Nuclear_war dbr:Oso,_Washington dbr:Dielectric_loss dbr:Diffraction dbr:Fast_Fourier_transform dbr:Magnetic_core dbr:Military_communication dbr:Noise_figure dbr:Solar_flare dbr:QRP_operation dbr:Radio_frequency dbr:Radio_receiver dbr:Radioteletype dbc:Radio_electronics dbr:Atmospheric_noise dbr:International_Telecommunication_Union dbr:Ionization dbr:Ionosphere dbr:Counterpoise_(ground_system) dbr:Hyperbolic_navigation dbr:Jim_Creek_Naval_Radio_Station dbr:Arlington,_Washington dbr:LaMoure,_North_Dakota dbr:Le_Blanc dbr:Bit_rate dbr:Sweden dbr:Ebino_VLF_transmitter dbr:High_frequency dbr:Whistler_(radio) dbr:Skywave dbr:Skelton_transmitting_station dbr:Digital_signal_processing dbr:Audio_signal dbr:Sound_card dbr:Cipher dbr:Frequency-shift_keying dbr:Frequency_modulation dbr:Frequency_synthesizer dbr:Continuous_Wave dbr:Ground_(electricity) dbr:Ground_wave dbr:F1_layer dbr:F2_layer dbr:ITA2 dbr:Inductor dbr:Anthorn_radio_station dbr:Nyquist_frequency dbr:Omega_(navigation_system) dbr:Radiation_resistance dbr:Radio_atmospheric dbr:Radio_clock dbr:Radio_mast dbr:Seattle dbr:Minimum-shift_keying dbr:Submarine dbr:Sideband dbr:Signal-to-noise_ratio dbr:Sine_wave dbr:Time_signal dbr:Wavelength dbr:Wireless_telegraphy dbr:Saturable_reactor dbr:Extremely_low_frequency dbr:Fading dbr:Cathode_ray_tube dbr:Litz_wire dbr:Waveguide dbr:Through-the-earth_mine_communications dbr:Rubidium_standard dbr:Naval_Communication_Station_Harold_E._Holt dbr:Geophysicist dbr:Multiple_frequency-shift_keying dbr:VLF_transmitter_DHO38 dbr:Navigation_beacon dbr:PNS_Hameed dbr:Radio_navigation dbr:Tavolara_Island dbr:Resonant dbr:Electrostatic_energy dbr:Half_wave_dipole dbr:Chu-Harrington_limit dbr:Magnetic_permeability dbr:Transverse_magnetic dbr:Tuned_circuit dbr:Sudden_Ionospheric_Disturbance dbr:Sferics dbr:Radio_amateur dbr:Radiotelegraphy dbr:Radiotelephony dbr:D_layer dbr:Grimeton_VLF_transmitter dbr:KHz dbr:Signaling_rate dbr:Alpha_(radio_navigation) dbr:Resonant_frequency dbr:Karachi_coast dbr:VLF_transmitter_Grimeton dbr:Geophysicists dbr:File:Grimetonmasterna.jpg dbr:B:Electronics/Gallery_of_VLF-signals dbr:B:Electronics/VLF-reception_with_the_PC dbr:Buoyant_Cable_Array_Antenna dbr:File:Flattop_antenna_1912.png dbr:File:VLF_18.1_kHz_spectrogram.svg dbr:File:VLFatPalmer.JPG dbr:Matotchkinchar |
| dbp:align | center (en) |
| dbp:caption | Central mast of a similar "trideco" antenna of the NATO VLF transmitter at Anthorn radio station, UK, showing 6 insulator strings attaching the toploads to the 6 vertical radiator wires (en) Umbrella antenna of the Omega navigation system beacon on Tsushima Island, Japan, which transmitted at 10-14 kHz; 389 meters high, it was dismantled in 1977. (en) Another type of large VLF antenna: the "valley-span" antenna, consisting of one or more long horizontal topload cables spanning a valley, fed in the center by vertical radiator cables. This example is at the US Navy Jim Creek station near Seattle, which transmits on 24.8 kHz at a power of 1.2 MW. (en) "Trideco" antenna tower array at the US Navy's Naval Radio Station Cutler in Cutler, Maine, USA. The central mast is the radiating element, while the star-shaped horizontal wire array is the capacitive top load. About 1.2 miles in diameter, it communicates with submerged submarines at 24 kHz at a power of 1.8 megawatts, one of the most powerful radio stations in the world. (en) |
| dbp:direction | horizontal (en) |
| dbp:freq | 3 (xsd:integer) |
| dbp:image | Cutler VLF antenna array.png (en) VLF umbrella antenna - Anthorn Radio Station UK - central mast.jpg (en) Jim Creek VLF antenna.png (en) Tsushima Omega Tower 1977 2.jpg (en) |
| dbp:wave | 100 (xsd:integer) |
| dbp:width | 220 (xsd:integer) 223 (xsd:integer) 265 (xsd:integer) 370 (xsd:integer) |
| dbp:wikiPageUsesTemplate | dbt:MWband dbt:EMSpectrum dbt:Authority_control dbt:Cite_book dbt:Cite_web dbt:Clear dbt:Convert dbt:Multiple_image dbt:Mvar dbt:Redirect dbt:Refbegin dbt:Refend dbt:Reflist dbt:Rp dbt:Short_description dbt:Unreferenced_section dbt:Val dbt:TimeSig dbt:Radio_spectrum |
| dct:subject | dbc:Radio_spectrum dbc:Radio_electronics |
| gold:hypernym | dbr:Designation |
| rdf:type | owl:Thing dbo:Place |
| rdfs:comment | VLF ( Very Low Frequency , Freqüència Molt Baixa ) és la banda de l'espectre electromagnètic de freqüència de 10 kHz a 30 kHz. A aquesta banda la propagació és per ona de superfície, amb baixa atenuació. Permet emetre ones de ràdio a gran distància. Com inconvenient cal destacar l'escassa amplada de banda disponible, i la poca eficàcia de les antenes a tan baixes freqüències. (ca) التردد شديد الانخفاض (بالإنجليزية: Very low frequency) اختصاراً VLF، وفق الاتحاد الدولي للاتصالات هو تردد لموجات الراديو يتراوح بين 3 إلى 30 ألف هرتز، وذلك يوافق طول موجة من 100 إلى 10 كيلومتر، على الترتيب. لهذه الموجة عرض نطاق محدود، ولذلك لا تستخدم لنقل ، إنما فقط لنقل الإشارات المشفرة. (ar) Υπερμακρά κύματα (Αγγλική γλώσσα very low frequency, VLF) είναι η ονομασία των ηλεκτρομαγνητικών κυμάτων του φάσματος συχνοτήτων από 3 έως 30kHz . Το εύρος συχνοτήτων κάτω από 9 kHz δεν απασχολεί τον διεθνή οργανισμό τηλεπικοινωνιών (ITU). (el) Als Längstwellen (englisch very low frequency, kurz VLF) bezeichnet man elektromagnetische Wellen im Frequenzbereich von 3 bis 30 kHz (nicht zu verwechseln mit Niederfrequenz (< 3 kHz); siehe Frequenzband). Der Frequenzbereich unter 9 kHz unterliegt von Seiten der internationalen Fernmeldeorganisation (ITU) keiner Regulierung. (de) La designación de frecuencia muy baja (VLF; Very Low Frequency, en inglés) se usa para denominar a la banda del espectro electromagnético que ocupa el rango de frecuencias de 3 a 30 kilohercios (longitudes de onda de 100 a 10 kilómetros). (es) La très basse fréquence, en anglais Very low frequency (VLF), désigne la bande de radiofréquences qui s'étend de 3 kHz à 30 kHz (longueur d'onde de 100 à 10 km).Les ondes VLF sont aussi appelées ondes myriamétriques (le myria- est un préfixe obsolète valant 10 000). (fr) 超長波（ちょうちょうは、VLF（Very Low Frequency））とは、3 - 30kHzの周波数の電波をいう。波長は10 - 100km、ミリアメートル波とも呼ばれる。 (ja) Very low frequency or VLF is the ITU designation for radio frequencies (RF) in the range of 3–30 kHz, corresponding to wavelengths from 100 to 10 km, respectively. The band is also known as the myriameter band or myriameter wave as the wavelengths range from one to ten myriameters (an obsolete metric unit equal to 10 kilometers). Due to its limited bandwidth, audio (voice) transmission is highly impractical in this band, and therefore only low data rate coded signals are used. The VLF band is used for a few radio navigation services, government time radio stations (broadcasting time signals to set radio clocks) and for secure military communication. Since VLF waves can penetrate at least 40 meters (131 ft) into saltwater, they are used for military communication with submarines. (en) Met very low frequency of VLF worden frequenties in het radiospectrum aangeduid tussen 3 en 30 kHz. De radiogolven hebben een golflengte tussen 10 en 100 kilometer. Aangezien er vergeleken met de hogere frequenties weinig bandbreedte is in deze band, worden enkel de allereenvoudigste signalen gebruikt, zoals Morsecode en signalen voor radionavigatie, maar geen spraak. (nl) Fale bardzo długie (fale myriametrowe, VLF – z ang. very low frequency) – zakres fal radiowych o częstotliwości: 3–30 kHz (długości 10–100 km). (pl) VLF, Very Low Frequency, är radiofrekvenser mellan 3 och 30 kHz d.v.s. våglängder mellan 10 och 100 km. Radiostationen i Grimeton sänder på 17,2 kHz. VLF-bandet är även känt som myriameterbandet eller myriametervågor. (sv) Сверхдлинные волны — радиоволны с длиной волны свыше 10 км. Они легко огибают Землю, слабо поглощаются земной поверхностью, проникают вглубь морской воды, хорошо отражаются от ионосферы. (ru) Наддо́вгі радіохви́лі (англ. Very low frequency, VLF) — радіохвилі довжиною 10–100 км (частота 3–30 кГц) і довше. Іноді вживається назва міріаметрові хвилі (від назви позасистемної метричної міри довжини , що дорівнює 10000 метрів) або міріаметровий діапазон. (uk) 甚低頻（VLF, Very Low Frequency）是指由國際電信聯盟定義的頻帶由3KHz到30KHz的無線電波。其波長為100公里到10公里，因此又稱為萬米波。 萬米波由於其帶寬有限，比較難以傳播語音信號，並且只能使用低數據速率編碼系統。VLF頻段可以用於無線電導航服務、軍事通訊、政府授時、無線電時鐘。由於VLF波可以穿透至少40公尺海水，因此它們被用於潛艇通信。 (zh) Very low frequency o VLF (in inglese frequenza molto bassa) è il nome che convenzionalmente è stato assegnato alle radiofrequenze comprese tra 3 e 30 kHz, cui corrispondono lunghezze d'onda tra i 100 e 10 chilometri. La sigla rappresenta una delle bande radio definite dalla ITU-R nella raccomandazione V.431 e la cui origine risale alla IV conferenza del comitato CCIR che si tenne a Bucarest nel 1937, i cui lavori furono ratificati dalla International Radio Conference di Atlantic City del 1947. (it) VLF é a sigla para Very Low Fequency - Frequências Ultra Baixas Radiação eletromagnética com esta frequência é emitida, por exemplo, pelas linhas de transmissão de energia elétrica em corrente alternada. Também é usada para a rede de comunicação via rádio de submarinos. As antenas para este tipo de rádio-comunicação são enormes, devido ao grande comprimento de onda. (pt) |
| rdfs:label | تردد شديد الانخفاض (ar) VLF (ca) Längstwelle (de) Υπερμακρά κύματα (el) Frecuencia muy baja (es) Frekuensi sangat rendah (in) Très basse fréquence (fr) Very low frequency (it) 超長波 (ja) Very low frequency (nl) Fale bardzo długie (pl) Very Low Frequency (pt) Very low frequency (en) Väldigt låg frekvens (sv) Сверхдлинные волны (ru) Наддовгі радіохвилі (uk) 甚低频 (zh) |
| owl:sameAs | freebase:Very low frequency http://d-nb.info/gnd/4267786-5 wikidata:Very low frequency dbpedia-ar:Very low frequency dbpedia-ca:Very low frequency dbpedia-da:Very low frequency dbpedia-de:Very low frequency dbpedia-el:Very low frequency dbpedia-es:Very low frequency dbpedia-fa:Very low frequency dbpedia-fi:Very low frequency dbpedia-fr:Very low frequency http://hi.dbpedia.org/resource/अति_निम्न_आवृत्ति_(VLF) http://hy.dbpedia.org/resource/Գերերկար_ալիքներ dbpedia-id:Very low frequency dbpedia-it:Very low frequency dbpedia-ja:Very low frequency dbpedia-nl:Very low frequency dbpedia-nn:Very low frequency dbpedia-no:Very low frequency dbpedia-pl:Very low frequency dbpedia-pt:Very low frequency dbpedia-ru:Very low frequency dbpedia-sv:Very low frequency dbpedia-tr:Very low frequency dbpedia-uk:Very low frequency http://vec.dbpedia.org/resource/Very_low_frequency dbpedia-vi:Very low frequency dbpedia-zh:Very low frequency https://global.dbpedia.org/id/4jnSN |
| prov:wasDerivedFrom | wikipedia-en:Very_low_frequency?oldid=1119127102&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/Cutler_VLF_antenna_array.png wiki-commons:Special:FilePath/Flattop_antenna_1912.png wiki-commons:Special:FilePath/Grimetonmasterna.jpg wiki-commons:Special:FilePath/Jim_Creek_VLF_antenna.png wiki-commons:Special:FilePath/Tsushima_Omega_Tower_1977_2.jpg wiki-commons:Special:FilePath/VLF_18.1_kHz_spectrogram.svg wiki-commons:Special:FilePath/VLF_umbrella_antenna_...n_Radio_Station_UK_-_central_mast.jpg wiki-commons:Special:FilePath/VLFatPalmer.jpg |
| foaf:isPrimaryTopicOf | wikipedia-en:Very_low_frequency |
| is dbo:academicDiscipline of | dbr:Umran_Inan |
| is dbo:wikiPageRedirects of | dbr:Very_Low_Frequency dbr:VLF dbr:VLF_Receiver dbr:Vlf |
| is dbo:wikiPageWikiLink of | dbr:Rugby_Radio_Station dbr:Electrical_treeing dbr:Electromagnetic_spectrum dbr:Electron_precipitation dbr:List_of_VLF-transmitters dbr:List_of_computing_and_IT_abbreviations dbr:Navy_Electronics_Laboratory dbr:Barracuda-class_submarine_(France) dbr:Baudline dbr:Beta_(time_signal) dbr:Blake_Wayne_Van_Leer dbr:Boeing_E-4 dbr:Defence_High_Frequency_Communications_Service dbr:Antenna_types dbr:Umran_Inan dbr:VLF_Transmitter_Cutler dbr:Very_Low_Frequency dbr:Earth's_field_NMR dbr:Index_of_physics_articles_(V) dbr:Index_of_radio_propagation_articles dbr:Interstellar_medium dbr:Lightning dbr:Umbrella_antenna dbr:10,000 dbr:Russian_submarine_Ak_Bars_(K-480) dbr:Russian_submarine_Barnaul_(K-263) dbr:Russian_submarine_Bratsk_(K-391) dbr:Russian_submarine_Gepard_(K-335) dbr:Russian_submarine_Kashalot_(K-322) dbr:Russian_submarine_Kuzbass_(K-419) dbr:Russian_submarine_Leopard_(K-328) dbr:Russian_submarine_Magadan_(K-331) dbr:Russian_submarine_Pantera_(K-317) dbr:Russian_submarine_Samara_(K-295) dbr:Russian_submarine_Tigr_(K-154) dbr:Russian_submarine_Volk_(K-461) dbr:SANAE_IV dbr:Nauen_Transmitter_Station dbr:Alexanderson_alternator dbr:Electromagnetic_radiation dbr:Electronvolt dbr:Gildeskål dbr:Continental_Electronics dbr:LOFTI_2 dbr:Anthony_R._Barringer dbr:Lualualei_VLF_transmitter dbr:Call_sign dbr:Skelton_Transmitting_Station dbr:Cluster_One dbr:Communication_with_submarines dbr:Sprite_(lightning) dbr:Bad_Sobernheim dbr:British_U-class_submarine dbr:Caving_equipment dbr:WWVB dbr:Dixon_Naval_Radio_Transmitter_Facility dbr:Llewelyn_Robert_Owen_Storey dbr:Loading_coil dbr:Radio_wave dbr:AMPTE-IRM dbr:ATS-2 dbr:African_bush_elephant dbr:Aguada_transmission_station dbr:Akula-class_submarine dbr:Aldra dbr:Dynamics_Explorer_1 dbr:Earth–ionosphere_waveguide dbr:Amateur_radio_operator dbr:Ernst_Alexanderson dbr:Explorer_40 dbr:Explorer_43 dbr:Explorer_50 dbr:Explorer_52 dbr:Explorer_6 dbr:FR-1_(satellite) dbr:Northrop_Grumman_B-2_Spirit dbr:P._V._Manoranjan_Rao dbr:Pakistan_Navy dbr:Goldschmidt_alternator dbr:Goliath_transmitter dbr:List_of_Marconi_wireless_stations dbr:List_of_Special_Operations_Executive_operations dbr:Sudden_ionospheric_disturbance dbr:Radio dbr:Radio_frequency dbr:Radio_propagation dbr:Radioteletype dbr:Grimeton_Radio_Station dbr:Ground_dipole dbr:Heart_Peaks dbr:High-frequency_Active_Auroral_Research_Program dbr:Atmospheric_noise dbr:Japanese_submarine_I-1 dbr:Japanese_submarine_I-2 dbr:Counterpoise_(ground_system) dbr:Jim_Creek_Naval_Radio_Station dbr:Survivable_Low_Frequency_Communications_System dbr:LOFTI-1 dbr:LZ_127_Graf_Zeppelin dbr:SumbandilaSat dbr:T-antenna dbr:TACAMO dbr:Hessdalen_lights dbr:Whistler_(radio) dbr:Skywave dbr:Sainte-Assise_transmitter dbr:Arthur_O._Austin dbr:Port_Lions,_Alaska dbr:Spark-gap_transmitter dbr:Ferrite_core dbr:Frequency-shift_keying dbr:Ground_(electricity) dbr:Ground_wave dbr:INS_Kattabomman dbr:ISEE-1 dbr:Indian_Navy dbr:Metal_detector dbr:OV2-5 dbr:Ohio-class_submarine dbr:Omega_(navigation_system) dbr:Radiation_resistance dbr:Radio_spectrum dbr:Yosami_Transmitting_Station dbr:Robert_Helliwell dbr:The_Hum dbr:Longwave dbr:Nuclear_magnetic_resonance dbr:Radio_masts_and_towers dbr:Transmission_medium dbr:Project_Sanguine dbr:Software-defined_radio dbr:Super_low_frequency dbr:Shortwave_radio dbr:Van_Allen_radiation_belt dbr:Extremely_low_frequency dbr:INS_Varsha dbr:Ilyushin_Il-80 dbr:List_of_transmission_sites dbr:Through-the-earth_mine_communications dbr:Plasmasphere dbr:Naval_Communication_Station_Harold_E._Holt dbr:Naval_Radio_Transmitter_Facility_LaMoure dbr:Ryazanskaya_(rural_locality) dbr:PNS_Hameed dbr:Space-themed_music dbr:VLF dbr:VLF_Receiver dbr:Vlf |
| is foaf:primaryTopic of | wikipedia-en:Very_low_frequency |
